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WO2016084362A1 - Vehicle collision sensing device - Google Patents

Vehicle collision sensing device Download PDF

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Publication number
WO2016084362A1
WO2016084362A1 PCT/JP2015/005824 JP2015005824W WO2016084362A1 WO 2016084362 A1 WO2016084362 A1 WO 2016084362A1 JP 2015005824 W JP2015005824 W JP 2015005824W WO 2016084362 A1 WO2016084362 A1 WO 2016084362A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
tube member
bumper
detection
collision
Prior art date
Application number
PCT/JP2015/005824
Other languages
French (fr)
Japanese (ja)
Inventor
大祐 中根
田辺 貴敏
吉田 智一
皓太 天野
Original Assignee
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to DE112015005302.6T priority Critical patent/DE112015005302B4/en
Publication of WO2016084362A1 publication Critical patent/WO2016084362A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/48Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects combined with, or convertible into, other devices or objects, e.g. bumpers combined with road brushes, bumpers convertible into beds
    • B60R19/483Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects combined with, or convertible into, other devices or objects, e.g. bumpers combined with road brushes, bumpers convertible into beds with obstacle sensors of electric or electronic type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/186Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
    • B60R2019/1873Cellular materials

Definitions

  • the present disclosure relates to a vehicle collision detection device for detecting a collision between a vehicle and a pedestrian.
  • a pedestrian protection device for reducing the impact on the pedestrian when the pedestrian collides with the vehicle.
  • a bumper unit is provided with a collision detection device, and when this sensor detects that a pedestrian or the like has collided with the vehicle, the pedestrian protection device is activated to reduce the impact on the pedestrian.
  • This pedestrian protection device includes what is called a pop-up hood, for example. This pop-up hood raises the rear end of the engine hood when a vehicle collision is detected, increases the clearance (clearance) between the pedestrian and hard parts such as the engine, and uses that space to the pedestrian's head. It absorbs collision energy and reduces the impact on the head.
  • a chamber member having a chamber space is disposed in front of a bumper reinforcement in a bumper of the vehicle, and a pressure sensor detects the pressure in the chamber space.
  • a pressure sensor detects the pressure in the chamber space.
  • This vehicle collision detection device includes a bumper absorber disposed in a bumper of a vehicle, a hollow tube member mounted in a groove formed in the bumper absorber along the vehicle width direction, and a pressure in the tube member. And a pressure sensor for detection.
  • a pedestrian or the like collides with the front of the vehicle, the tube member is deformed simultaneously with the deformation of the bumper cover while the bumper absorber absorbs the shock. At this time, the pressure in the tube member rises, and the collision between the vehicle and the pedestrian is detected based on detecting the pressure change by the pressure sensor.
  • the present disclosure has been made in view of the above-described problems, and an object of the present invention is to provide a vehicle collision detection device capable of sufficiently ensuring a pressure detection range by a tube member in a tube type vehicle collision detection device.
  • a vehicle collision detection device made to solve the above object is formed with a bumper absorber disposed in a bumper of a vehicle and a rear surface of the bumper absorber along a vehicle width direction.
  • a detection tube member mounted in the groove and disposed on the vehicle front side of the rigid member and having a hollow portion formed therein, and a pressure sensor for detecting the pressure in the hollow portion, pressure detection by the pressure sensor Based on the result, the collision of the object with the bumper is detected.
  • On the front surface of the rigid member a recess is formed along the vehicle width direction at a position facing the detection tube member so as to accommodate at least a part of the detection tube member deformed by the pressure from the bumper absorber when a collision occurs. It is characterized by.
  • the detection tube member deformed by the pressure from the bumper absorber when a collision occurs At least a part of can be accommodated in the recess.
  • the bumper absorber is deformed to the vehicle rear side, the vehicle front side and rear side inner wall surfaces of the detection tube member come into contact with each other, and the pressure detection output by the pressure sensor becomes saturated. Can be suppressed. Therefore, a sufficient pressure detection range can be ensured by the detection tube member of the vehicle collision detection device.
  • FIG. 1 is a diagram illustrating an overall configuration of a vehicle collision detection device according to a first embodiment. It is an enlarged view of the bumper part of FIG.
  • FIG. 3 is a III-III cross-sectional view of the bumper portion of FIG. 2. It is an expanded sectional view of the recessed part of the bumper reinforcement of FIG. It is a figure which shows the state which the deformation
  • FIG. 5 is a view corresponding to FIG. 4 in a reference example.
  • FIG. 5 is a diagram corresponding to FIG. 4 in the second embodiment.
  • FIG. 7 is a view corresponding to FIG. 6 in the second embodiment.
  • FIG. 5 is a diagram corresponding to FIG. 4 in a third embodiment.
  • FIG. 7 is a view corresponding to FIG. 6 in the third embodiment. It is a figure which shows the whole structure of the collision detection apparatus for vehicles in 4th Embodiment. It is an enlarged view of the bumper part of FIG.
  • FIG. 14 is a cross-sectional view of the bumper portion of FIG. 13 taken along XIV-XIV. It is an expanded sectional view of the recessed part of the bumper reinforcement of FIG.
  • the vehicle collision detection device 1 of the present embodiment includes a bumper absorber 2, a detection tube member 3, a pressure sensor 4, a speed sensor 5, a collision detection ECU 6, a bumper reinforcement 9, and the like. It is configured with.
  • the vehicle collision detection device 1 detects a collision of an object such as a pedestrian with a bumper 7 provided in front of the vehicle.
  • the bumper 7 is mainly composed of a bumper cover 8, a bumper absorber 2, and a bumper reinforcement 9.
  • the bumper absorber 2 is provided on the front surface 9 a of the bumper reinforcement 9 and is disposed so as to surround the detection tube member 3.
  • the bumper absorber 2 is a member responsible for shock absorption in the bumper 7, and is made of, for example, foamed polypropylene.
  • a groove 2 a for mounting the detection tube member 3 is formed on the rear surface 2 b of the bumper absorber 2.
  • the groove 2a has a rectangular cross section and is formed along the vehicle width direction.
  • the length L2 of the groove 2a in the vehicle front-rear direction is set to be smaller than the length of the detection tube member 3 in the vehicle front-rear direction (outer diameter D) by a predetermined length.
  • the groove part 2a may have the bending part bent in the up-down direction in the middle (for example, the design part etc. provided in the vehicle width direction center part) in the vehicle width direction.
  • the cross-sectional shape of the groove 2a is not limited to a rectangle, and can be appropriately changed to, for example, a polygon, a circle, or an ellipse.
  • the detection tube member 3 is a tube-like member having a hollow portion 3 a formed therein and extending in the vehicle width direction (vehicle left-right direction). It is attached to the groove 2a.
  • the detection tube member 3 is disposed on the front surface 9a (the vehicle front side) of the bumper reinforcement 9 in the bumper 7 of the vehicle. Both ends of the tube member for detection 3 are curved in a substantially U shape and connected to a pressure sensor 4 to be described later on the left and right outer sides of the bumper reinforcement 9 in the vehicle width direction.
  • the detection tube member 3 has a circular cross-sectional shape and is made of synthetic rubber, for example, silicone rubber.
  • the outer diameter D of the detection tube member 3 is assumed to be about 8 mm to 12 mm, for example.
  • the wall thickness t of the peripheral wall of the detection tube member 3 is assumed to be about 1 mm to 2 mm, for example.
  • the cross-sectional shape of the detection tube member 3 is not limited to a circle, but may be a polygon such as a quadrangle.
  • the material of the tube member 3 for detection may be ethylene propylene rubber (EPDM) or the like.
  • the detection is performed in a state where the detection tube member 3 is attached to the groove portion 2a.
  • the rear portion of the tube member 3 projects from the rear surface 2b of the bumper absorber 2 to the rear side by a predetermined length.
  • the length L2 of the groove 2a in the vehicle front-rear direction is set to D-2t. Therefore, in the state where the detection tube member 3 is mounted in the groove 2a, the rear portion of the detection tube member 3 is The bumper absorber 2 protrudes rearward by 2t from the rear surface 2b.
  • the pressure sensor 4 is disposed on the vehicle rear side with respect to the front surface 9a of the bumper reinforcement 9. Specifically, two pressure sensors 4 are installed on the left and right ends of the bumper cover 7, and are fixedly attached to the rear surface 9b of the bumper reinforcement 9 by fastening with bolts (not shown) or the like. . In this embodiment, redundancy and detection accuracy are ensured by installing two pressure sensors 4 in this way.
  • the pressure sensor 4 is connected to both left and right ends of the detection tube member 3, and is configured to detect the pressure in the hollow portion 3a of the detection tube member 3.
  • the pressure sensor 4 is a sensor device that detects a change in the pressure of the gas, and detects a change in the pressure of the air in the hollow portion 3 a of the detection tube member 3.
  • the pressure sensor 4 is electrically connected to a collision detection ECU (Electronic Control Unit) 6 via a transmission line, and outputs a signal proportional to the pressure to the collision detection ECU 6.
  • the collision detection ECU 6 detects a pedestrian collision with the bumper 7 based on the pressure detection result by the pressure sensor 4. Further, the collision detection ECU 6 is electrically connected to the pedestrian protection device 10.
  • the speed sensor 5 is a sensor device that detects the speed of the vehicle, and is electrically connected to the collision detection ECU 6 via a signal line. The speed sensor 5 transmits a signal proportional to the vehicle speed to the collision detection ECU 6.
  • the collision detection ECU 6 is composed mainly of a CPU and controls the overall operation of the vehicle collision detection apparatus 1, and is electrically connected to each of the pressure sensor 4, the speed sensor 5, and the pedestrian protection apparatus 10. (See FIG. 1).
  • the collision detection ECU 6 receives a pressure signal (pressure data) from the pressure sensor 4, a speed signal (speed data) from the speed sensor 5, and the like.
  • the collision detection ECU 6 executes a predetermined collision determination process based on the pressure detection result (input signal) by the pressure sensor 4 and the speed detection result (input signal) by the speed sensor 5, and an object such as a pedestrian to the bumper 7 When a collision is detected, the pedestrian protection device 10 is activated.
  • the bumper 7 is for reducing an impact at the time of a vehicle collision, and includes a bumper cover 8, a bumper absorber 2, a bumper reinforcement 9, and the like.
  • the bumper cover 8 is provided so as to cover the components of the bumper 7 and is a resin member such as polypropylene.
  • the bumper cover 8 constitutes the appearance of the bumper 7 and at the same time constitutes a part of the appearance of the entire vehicle.
  • the bumper reinforcement 9 is a rigid member made of metal such as aluminum that is disposed in the bumper cover 8 and extends in the vehicle width direction. As shown in FIG. A hollow member having a letter-shaped cross section.
  • the bumper reinforcement 9 has a vehicle front side surface (front surface 9a) and a vehicle rear side surface (rear surface 9b). As shown in FIGS. 1 and 2, the bumper reinforcement 9 is attached to the front end of a side member 11 that is a pair of metal members extending in the vehicle front-rear direction.
  • the pressure sensor 4 is disposed on the rear surface 9b of the bumper reinforcement 9, and an impact (external force) associated with a collision with a pedestrian or vehicle in front of the vehicle is provided in front of the vehicle.
  • the bumper reinforcement 9 protects the direct transmission from the bumper cover 8 or the like to the pressure sensor 4.
  • the recessed part 9c is formed in the front surface 9a of the bumper reinforcement 9 over the whole vehicle width direction.
  • the recess 9c has a rectangular cross-sectional shape as viewed from the side of the vehicle.
  • the recessed part 9c is provided along the vehicle width direction in the position which opposes the detection tube member 3 with which the groove part 2a was mounted
  • the recess 9c is such that the upper end surface of the inner wall that forms the recess 9c is positioned above the vehicle upper side than the upper end surface of the groove 2a, and the lower end surface of the inner wall that forms the recess 9c is below the groove 2a. It is located on the vehicle lower side than the end face.
  • the length Lc in the vehicle front-rear direction of the concave portion 9c of the present embodiment is set to twice the thickness t of the peripheral wall of the detection tube member 3, that is, 2t.
  • the length Lc is not limited to 2t, and the length Lc may be greater than zero.
  • the range of the length Lc may be t ⁇ Lc ⁇ 2t.
  • the length Hc of the concave portion 9c in the vehicle vertical direction is set longer than the outer diameter D (length in the vehicle vertical direction) of the detection tube member 3.
  • the length Hc of the concave portion 9c in the vehicle vertical direction is such that the inner wall surfaces (inner wall surfaces) of the detection tube member 3 on the vehicle front side and the rear side are in contact with each other, and the detection tube member 3 is hollow.
  • the vertical dimension when the part 3a is crushed is assumed to be longer than ⁇ ⁇ (D ⁇ 2t) / 2 + 2t in this case.
  • the bumper reinforcement 9 in which the above-described recess 9c is formed is in contact with the rear surface 2b of the bumper absorber 2. Assembled. At this time, the detection tube member 3 is arranged in a state in which at least a part of the detection tube member 3 (a vehicle rear side portion or the like) is accommodated in the recess 9c.
  • the outer diameter D of the detection tube member 3 is substantially equal to the length of L2 + Lc.
  • a pop-up hood is used as the pedestrian protection device 10.
  • This pop-up hood instantly raises the rear end of the engine hood after a vehicle collision is detected, increases the clearance (clearance) between the pedestrian and hard parts such as the engine, and uses that space to make the pedestrian's head The impact energy on the pedestrian is absorbed and the impact on the pedestrian's head is reduced.
  • a cowl airbag or the like that cushions a pedestrian's impact by deploying the airbag from the engine hood outside the vehicle body to the lower part of the front window may be used.
  • the bumper cover 8 of the bumper 7 is deformed to the vehicle rear side by an impact (external force) due to the collision with the pedestrian or the like.
  • the bumper absorber 2 is deformed to the vehicle rear side while absorbing the impact, and at the same time, the detection tube member 3 is deformed so as to be crushed in the vehicle front-rear direction. To do.
  • the pressure in the hollow portion 3 a of the detection tube member 3 rises rapidly, and this pressure change is transmitted to the pressure sensor 4.
  • the deformation amount of the bumper absorber 2 is x1
  • the deformation amount of the detection tube member 3 is x2
  • the length of the bumper absorber 2 before the collision in the vehicle longitudinal direction is L1
  • the detection tube member 3 before the collision of the vehicle tube When the length in the direction is L2, there is a relationship represented by the following equation.
  • the amount of deformation of the bumper absorber 2 is attenuated and transmitted to the detection tube member 3, but this amount of attenuation is very small and is ignored.
  • the maximum value of the deformation amount x2 of the detection tube member 3 is the detection value.
  • the outer diameter D of the tube member 3 is equal to 8 [mm].
  • the maximum deformation amount x1 of the bumper absorber 2 is 80 mm, which is equal to the length L1 of the bumper absorber 2 in the vehicle front-rear direction. Therefore, in the case A, the deformation amount of the bumper absorber 2 that can be detected by the maximum deformation amount of the detection tube member 3 is 50% by 40 ⁇ 80 ⁇ 100. That is, the amount of deformation of the bumper absorber 2 corresponding to the remaining 50% cannot be detected by the deformation of the detection tube member 3.
  • the detection tube member 3 can be sufficiently deformed even when the deformation amount x1 of the bumper absorber 2 increases. It has a simple structure. Specifically, when an external force is applied to the vehicle rear side by pressing from the bumper absorber 2, at least a part of the tube member for detection 3 (such as a vehicle rear side portion) is accommodated in the recess 9c. In this state, the vehicle is deformed rearward (see FIG. 5). When the length of the concave portion 9c in the vehicle front-rear direction is Lc, (Equation 2) is corrected as shown below.
  • the length Lc of the recess 9c in the vehicle front-rear direction is appropriately set within a range of 2 t or less, which is equal to or greater than the thickness t of the peripheral wall of the detection tube member 3 and twice the thickness of the peripheral wall of the detection tube member 3. It shall be possible.
  • the maximum value of x2 is equal to the outer diameter D of the detection tube member 3 and is 8 [mm].
  • the maximum deformation amount x1 of the bumper absorber 2 is 80 mm. Therefore, the deformation amount of the bumper absorber 2 that can be detected by the maximum deformation amount of the detection tube member 3 can be 100% by 80 ⁇ 80 ⁇ 100.
  • the deformation of the tube member for detection 3 can detect the maximum deformation amount of the bumper absorber 2 in the longitudinal direction of the vehicle 100%. Thereby, in the vehicle collision detection device 1, the pressure detection range in the hollow portion 3 a of the detection tube member 3 by the pressure sensor 4 can be expanded.
  • pressure detection range refers to the detection tube member 3 after the detection tube member 3 starts to be deformed when the bumper absorber 2 is deformed to the vehicle rear side along with the deformation of the bumper cover 8 at the time of collision.
  • the pressure detection range (pressure detection range) in the case of the length Lc in the vehicle front-rear direction of the recess 9c is calculated by the following equation.
  • the collision detection ECU 6 of the vehicle collision detection device 1 executes a predetermined collision determination process based on the detection results of the pressure sensor 4 and the speed sensor 5.
  • the effective mass of the collision object is calculated based on the detection results of the pressure sensor 4 and the speed sensor 5, and when this effective mass is larger than a predetermined threshold, a collision with a pedestrian has occurred.
  • a predetermined range for example, a range of 25 km to 55 km / h
  • the “effective mass” refers to a mass calculated using the relationship between momentum and impulse from the detection value of the pressure sensor 4 at the time of collision.
  • the value of the detected pressure sensor 4 is different for a collision object having a mass different from that of a pedestrian. For this reason, by setting a threshold value between the effective mass of the human body and the mass of another assumed collision object, it is possible to classify the types of the collision object.
  • This effective mass is calculated by dividing the constant integral value of the pressure value detected by the pressure sensor 4 at a predetermined time by the vehicle speed detected by the speed sensor 5 as shown in the following equation.
  • M ( ⁇ P (t) dt) / V (Expression 5)
  • M is an effective mass
  • P is a value detected by the pressure sensor 4 at a predetermined time
  • t is a predetermined time (for example, several ms to several tens of ms)
  • V is a vehicle speed at the time of collision detected by the speed sensor 5.
  • E 1/2 ⁇ MV 2 representing the kinetic energy E of the collided object.
  • the collision detection ECU 6 determines that a collision has occurred with a pedestrian that requires the pedestrian protection device 10 to operate, the collision detection ECU 6 outputs a control signal for operating the pedestrian protection device 10 to operate the pedestrian protection device 10. Let the impact on the pedestrian be reduced as described above.
  • the vehicle collision detection apparatus 1 of the first embodiment is formed along the vehicle width direction on the bumper absorber 2 disposed in the bumper 7 of the vehicle and the rear surface 2b of the bumper absorber 2.
  • a tube member for detection 3 in which a hollow portion 3a is formed inside a bumper reinforcement 9 (rigid member) that is mounted in the groove portion 2a, and a hollow portion of the tube member for detection 3.
  • a pressure sensor 4 that detects the pressure in 3a, and detects the collision of an object such as a pedestrian against the bumper 7 based on the pressure detection result by the pressure sensor 4.
  • the front surface 9a of the bumper reinforcement 9 is a recess capable of accommodating at least a part of the detection tube member 3 deformed by the pressure from the bumper absorber 2 when a collision occurs at a position facing the detection tube member 3. 9c is formed along the vehicle width direction.
  • the bumper absorber is generated when a collision occurs. At least a part of the detection tube member 3 deformed by the pressure from 2 can be accommodated in the recess 9c. Thereby, when the bumper absorber 2 is deformed to the vehicle rear side, the vehicle front side and rear side inner wall surfaces of the detection tube member 3 come into contact with each other, so that the pressure detection output by the pressure sensor 4 is saturated. Can be prevented. Therefore, a sufficient pressure detection range by the detection tube member 3 of the vehicle collision detection device 1 can be secured.
  • the detection tube member 3 can be stably disposed on the vehicle front side of the bumper reinforcement 9, and the detection tube member 3 is disposed on the bumper absorber 2. Easy to assemble.
  • the bumper reinforcement 9 is characterized in that the front surface 9a excluding the recess 9c is in contact with the rear surface 2b of the bumper absorber 2. According to this configuration, the rear surface 2b of the bumper absorber 2 and the front surface 9a of the bumper reinforcement 9 (excluding the concave portion 9c) are in contact with each other, so that an impact (external force) associated with a collision between the vehicle and a pedestrian or the like is applied.
  • the bumper reinforcement 9 which is a rigid member can be reliably received. Thereby, it can prevent reliably that the tube member 3 for a detection is bent to the vehicle rear side, and can perform a collision detection correctly. Furthermore, it is possible to prevent the detection tube member 3 from dropping from the groove 2a, and the detection tube member 3 can be stably disposed in the groove 2a.
  • the length Lc of the concave portion 9c in the vehicle front-rear direction is set to be not less than the thickness t of the peripheral wall of the detection tube member 3 and not more than twice the thickness of the peripheral wall of the detection tube member 3. To do.
  • the length Lc in the vehicle front-rear direction is equal to or greater than the wall thickness t of the peripheral wall of the detection tube member 3 and the wall thickness of the peripheral wall of the detection tube member 3. Since the concave portion 9c that is twice or less is provided, the detection tube member 3 can be sufficiently deformed in proportion to the deformation amount of the bumper absorber 2 in the vehicle front-rear direction.
  • the pressure detection range in the hollow portion 3a of the tube member 3 for detection by the pressure sensor 4 can be reliably expanded. Further, the length Lc of the concave portion 9c in the vehicle front-rear direction can be prevented from being excessively large, and the detection tube member 3 can be prevented from being deformed so as to bend toward the vehicle rear side at the time of a collision. Can be made.
  • the pressure detection range which is 50% when there is no recess 9c, can be expanded to 66.7% to 100%.
  • the length Lc of the concave portion 9c in the vehicle front-rear direction is set to be twice the thickness of the peripheral wall of the detection tube member 3. According to this structure, the pressure detection range in the hollow part 3a of the tube member 3 for detection by the pressure sensor 4 can be expanded more effectively. That is, as described above, the deformation amount of the bumper absorber 2 that can be detected by the maximum deformation amount of the detection tube member 3 can be set to 100%. For example, in the case A described above, the pressure detection range, which is 50% when there is no recess 9c, can be expanded to 100%.
  • the length Hc of the concave portion 9c in the vehicle vertical direction is set to be longer than the length of the detection tube member 3 in the vehicle vertical direction. According to this configuration, since the length Hc of the concave portion 9c in the vehicle vertical direction is set to be longer than the length of the detection tube member 3 in the vertical direction of the vehicle, the deformation space of the detection tube member 3 in the concave portion 9c is reduced. It can be ensured sufficiently, and the presence of the upper and lower inner wall surfaces of the recess 9c can prevent the deformation of the detection tube member 3 from being hindered.
  • the length Hc of the concave portion 9c in the vehicle vertical direction is set to be longer than the vertical dimension when the hollow portion 3a of the detection tube member 3 is crushed.
  • the detection tube member 3 can be appropriately deformed until the inner wall surfaces of the vehicle front side and the rear side of the vehicle come into contact with each other.
  • a concave portion 9d having a semicircular cross section as viewed from the side of the vehicle is formed on the front surface 9a of the bumper reinforcement 9 over the entire vehicle width direction.
  • the recess 9 d has an inner wall surface inclined in a curved shape so that the length in the vertical direction of the vehicle becomes shorter toward the vehicle rear side.
  • the recess 9d is provided along the vehicle width direction at a position facing the detection tube member 3 mounted in the groove 2a.
  • the concave portion 9d is such that the uppermost portion of the inner wall forming the concave portion 9d is located above the upper end surface of the groove portion 2a and the lowermost portion of the inner wall forming the concave portion 9d is below the groove portion 2a. It is located on the vehicle lower side than the end face.
  • the length Lc of the concave portion 9d in the second embodiment in the vehicle front-rear direction is set to the length of the wall thickness t of the peripheral wall of the detection tube member 3.
  • the length Lc is not limited to t, and the length Lc may be greater than zero.
  • the range of the length Lc may be t ⁇ Lc ⁇ 2t.
  • the length Hc in the vehicle vertical direction at the opening of the recess 9d is set to be longer than the outer diameter D (length in the vehicle vertical direction) of the detection tube member 3. Specifically, the vehicle vertical length Hc at the opening of the recess 9d is set to be longer than the vertical dimension when the hollow portion 3a of the detection tube member 3 is crushed.
  • the bumper reinforcement 9 in which the above-described recess 9d is formed is formed on the rear surface 2b of the bumper absorber 2. Assembled in contact with the At this time, the detection tube member 3 is arranged in a state in which at least a part of the detection tube member 3 (a vehicle rear side portion or the like) is accommodated in the recess 9d.
  • the outer diameter D of the detection tube member 3 is substantially equal to the length of L2 + Lc.
  • the same effect as in the first embodiment can be obtained.
  • the recess 9d has a semicircular cross-sectional shape when viewed from the side of the vehicle, the circular detection tube 3 is deformed toward the vehicle rear side as the bumper absorber 2 is deformed, as shown in FIG. When it does, the tube member 3 for a detection can be accommodated stably.
  • the outer shape of the recess 9d matches the outer shape of the detection tube 3, it is possible to prevent the detection tube 3 from colliding with the corners of the recess 9d and being damaged. Thereby, the pressure detection range by the tube member 3 for detection of the collision detection apparatus 1 for vehicles can be expanded reliably.
  • a recess 9e having a triangular cross-sectional shape viewed from the side of the vehicle is formed on the front surface 9a of the bumper reinforcement 9 over the entire vehicle width direction.
  • the concave portion 9e has an inner wall surface inclined in a taper shape so that the length in the vehicle vertical direction becomes shorter toward the vehicle rear side.
  • the recess 9e is provided along the vehicle width direction at a position facing the detection tube member 3 attached to the groove 2a.
  • the concave portion 9e is such that the uppermost portion of the inner wall forming the concave portion 9e is positioned on the vehicle upper side of the upper end surface of the groove portion 2a, and the lowermost portion of the inner wall forming the concave portion 9e is the lower end surface of the groove portion 2a. It is located on the vehicle lower side.
  • the length Lc in the vehicle front-rear direction of the concave portion 9e of the third embodiment is set to the length of the wall thickness t of the peripheral wall of the detection tube member 3.
  • the length Lc is not limited to t, and the length Lc may be greater than zero.
  • the range of the length Lc may be t ⁇ Lc ⁇ 2t.
  • the length Hc in the vehicle vertical direction at the opening of the recess 9e is longer than the outer diameter D (length in the vehicle vertical direction) of the detection tube member 3, and in particular, the hollow portion 3a of the detection tube member 3 is. It may be set longer than the vertical dimension when it is crushed.
  • the bumper reinforcement 9 in which the above-described recess 9e is formed is provided on the rear surface 2b of the bumper absorber 2. Assembled in contact with the At this time, the detection tube member 3 is arranged in a state in which at least a part (the vehicle rear side portion or the like) of the detection tube member 3 is accommodated in the recess 9e.
  • the outer diameter D of the detection tube member 3 is substantially equal to the length of L2 + Lc.
  • the same effect as in the first embodiment can be obtained.
  • the circular detection tube member 3 is deformed while coming into contact with two points in the recess 9e, so that the detection tube member 3 is shifted in the vehicle vertical direction. Therefore, the detection tube member 3 can be stably deformed.
  • FIGS. 14 and 15 the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts will be described.
  • a back member 12 (rigid member) having a recess 12 c is provided on the vehicle front side of the bumper reinforcement 9.
  • the rear member 12 is configured to include a front surface (front surface 12 a) and a rear surface (rear surface 12 b), and the bumper absorber 2 and the bumper reinforcement. Between the vehicle 9 and the vehicle 9 in the vehicle width direction.
  • the back member 12 is a rigid member for receiving an external force accompanying an impact from the front of the vehicle, and is made of, for example, polyethylene (PE), polybutylene terephthalate (PBT), or the like.
  • the material of the back member 12 does not include a member having a function of absorbing an impact by being deformed at the time of collision like the bumper absorber 2 made of foamed resin.
  • a recess 12c is formed in the front surface 12a of the back member 12 over the entire vehicle width direction.
  • the recess 12c has a rectangular shape as viewed from the side of the vehicle.
  • the recessed part 12c is provided along the vehicle width direction in the position which opposes the detection tube member 3 with which the groove part 2a was mounted
  • the recess 12c has an upper end surface of the inner wall that forms the recess 12c located on the vehicle upper side of the upper end surface of the groove 2a, and a lower portion of the inner wall that forms the recess 12c.
  • the end surface is located on the vehicle lower side than the lower end surface of the groove 2a.
  • the length Lc of the concave portion 12c in the fourth embodiment in the vehicle front-rear direction is set to a length twice the wall thickness t of the peripheral wall of the detection tube member 3, that is, 2t.
  • the length Lc is not limited to t, and the length Lc may be greater than zero.
  • the range of the length Lc may be t ⁇ Lc ⁇ 2t.
  • the length Hc of the recess 12c in the vehicle vertical direction is set to be longer than the outer diameter D (length in the vehicle vertical direction) of the detection tube member 3.
  • the length Hc of the concave portion 12c in the vehicle vertical direction is such that the inner wall surfaces (inner wall surfaces) on the vehicle front side and the rear side of the detection tube member 3 are in contact with each other, and the detection tube member 3 is hollow.
  • the vertical dimension when the part 3a is crushed is assumed to be longer than ⁇ ⁇ (D ⁇ 2t) / 2 + 2t) in this case.
  • the detection tube member 3 after the detection tube member 3 is mounted in the groove portion 2 a of the bumper absorber 2, the back member 12 in which the concave portion 12 c is formed contacts the rear surface 2 b of the bumper absorber 2. It is assembled in the state. At this time, the detection tube member 3 is arranged in a state where at least a part of the detection tube member 3 (a vehicle rear side portion or the like) is accommodated in the recess 12c.
  • the outer diameter D of the detection tube member 3 is substantially equal to the length of L2 + Lc.
  • a bumper reinforcement 9 is disposed on the rear side of the rear member 12 in the vehicle.
  • the bumper reinforcement 9 is disposed in a state in which the front surface 9a is in contact with the rear surface 12b of the back member 12 in the entire vehicle width direction.
  • the bumper absorber 2 disposed in the bumper 7 of the vehicle, and the groove 2a formed along the vehicle width direction on the rear surface 2b of the bumper absorber 2.
  • a detection tube member 3 in which a hollow portion 3a is formed inside the rear member 12 disposed on the front side of the vehicle, and a pressure sensor for detecting a pressure in the hollow portion 3a of the detection tube member 3 4 and detects the collision of an object (pedestrian) with the bumper 7 based on the pressure detection result by the pressure sensor 4.
  • a recess 12c that can accommodate at least a part of the detection tube member 3 deformed by the pressure from the bumper absorber 2 at the time of occurrence of a collision is provided at a position facing the detection tube member 3. It is formed along the direction.
  • the back member 12 is disposed on the vehicle front side of the bumper reinforcement 9 and is a separate member from the bumper reinforcement 9.
  • the same effect as in the first embodiment can be obtained.
  • the rear member 12 having the recess 12c is disposed on the front side of the existing bumper reinforcement 9 so that the vehicle collision detection device 1 can detect the bumper reinforcement 9. It is possible to expand the pressure detection range by the tube member 3 for use.
  • the pressure sensor 4 is attached to the rear surface 9b of the bumper reinforcement 9.
  • the present invention is not limited to this, and the arrangement position of the pressure sensor 4 can be changed as appropriate.
  • a collision with a pedestrian that requires the operation of the pedestrian protection device 10 has occurred when the effective mass exceeds a predetermined threshold.
  • a pressure value detected by the pressure sensor 4, a pressure change rate, or the like may be used as a threshold for collision determination.
  • the rear portion of the detection tube member 3 protrudes from the rear surface 2b of the bumper absorber 2 to the vehicle rear side by a predetermined length in a state where the detection tube member 3 is mounted in the groove portion 2a.
  • the present disclosure can also be applied when the length of the groove 2a of the bumper absorber 2 in the vehicle front-rear direction is equal to the length of the detection tube member 3 in the vehicle front-rear direction.

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  • Engineering & Computer Science (AREA)
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  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

A vehicle collision sensing device (1) has: a bumper absorber (2) provided in a vehicle bumper (7); a detection tube member (3) provided on a vehicle-front side of a rigid member (9, 12) and mounted in a groove part formed along the vehicle width direction in a rear face (2b) of the bumper absorber (2), a hollow section (3a) being formed inside the detection tube member (3); and a pressure sensor (4) for detecting pressure in the hollow section (3a); the vehicle collision sensing device (1) sensing a collision of an object with the bumper (7) on the basis of the result of pressure detection by the pressure sensor (4). Recesses (9c, 9d, 9e, 12c) capable of accommodating at least a portion of the detection tube member (3) deformed by pressing from the bumper absorber (2) when a collision occurs are formed along the vehicle width direction in positions facing the detection tube member (3) on a front face (9a, 12a) of the rigid member (9, 12).

Description

車両用衝突検知装置Vehicle collision detection device 関連出願の相互参照Cross-reference of related applications
 本出願は、2014年11月26日に出願された日本特許出願番号2014-239066号に基づくもので、ここにその記載内容を援用する。 This application is based on Japanese Patent Application No. 2014-239066 filed on November 26, 2014, the contents of which are incorporated herein by reference.
 本開示は、車両と歩行者との衝突を検知するための車両用衝突検知装置に関する。 The present disclosure relates to a vehicle collision detection device for detecting a collision between a vehicle and a pedestrian.
 従来、歩行者が車両に衝突した際、歩行者への衝撃を軽減するための歩行者保護装置を備えた車両がある。この車両では、バンパ部にセンサを備えた衝突検知装置を設け、このセンサにより車両に歩行者等が衝突したことが検知された場合、歩行者保護装置を作動させ、歩行者への衝撃を和らげる構成となっている。この歩行者保護装置には、例えばポップアップフードと呼ばれるものがある。このポップアップフードは、車両の衝突検知時に、エンジンフードの後端を上昇させ、歩行者とエンジン等の硬い部品との間隔(クリアランス)を増加させ、そのスペースを用いて歩行者の頭部への衝突エネルギーを吸収し、頭部への衝撃を低減させるものである。 Conventionally, there are vehicles equipped with a pedestrian protection device for reducing the impact on the pedestrian when the pedestrian collides with the vehicle. In this vehicle, a bumper unit is provided with a collision detection device, and when this sensor detects that a pedestrian or the like has collided with the vehicle, the pedestrian protection device is activated to reduce the impact on the pedestrian. It has a configuration. This pedestrian protection device includes what is called a pop-up hood, for example. This pop-up hood raises the rear end of the engine hood when a vehicle collision is detected, increases the clearance (clearance) between the pedestrian and hard parts such as the engine, and uses that space to the pedestrian's head. It absorbs collision energy and reduces the impact on the head.
 上記した車両用衝突検知装置には、車両のバンパ内におけるバンパレインフォースメントの前面に、チャンバ空間を内部に有するチャンバ部材を配設し、このチャンバ空間内の圧力を圧力センサにより検出するようにしたものがある。この構成のものでは、バンパ(バンパカバー)へ歩行者等の物体が衝突すると、バンパカバーの変形に伴ってチャンバ部材が変形し、チャンバ空間に圧力変化が発生する。この圧力変化を圧力センサが検出することで歩行者の衝突を検知している。 In the above-described vehicle collision detection device, a chamber member having a chamber space is disposed in front of a bumper reinforcement in a bumper of the vehicle, and a pressure sensor detects the pressure in the chamber space. I have something to do. With this configuration, when an object such as a pedestrian collides with the bumper (bumper cover), the chamber member is deformed along with the deformation of the bumper cover, and a pressure change is generated in the chamber space. The pressure sensor detects this pressure change to detect a pedestrian collision.
 近年、上記したチャンバ式の車両用衝突検知装置よりも、小型で搭載性に優れたチューブ部材を用いて衝突を検知するチューブ式の車両用衝突検知装置が提案されている。この車両用衝突検知装置は、車両のバンパ内に配設されたバンパアブソーバと、バンパアブソーバに車幅方向に沿って形成された溝部に装着される中空のチューブ部材と、チューブ部材内の圧力を検出する圧力センサとを備えて構成される。そして、車両前方に歩行者等が衝突した際には、バンパカバーの変形に伴ってバンパアブソーバが衝撃を吸収しながら変形すると同時にチューブ部材も変形する。このとき、チューブ部材内の圧力が上昇し、この圧力変化を圧力センサにより検出することに基づいて、車両と歩行者との衝突を検知する。 In recent years, a tube-type vehicle collision detection device that detects a collision using a tube member that is smaller and more easily mounted than the above-described chamber-type vehicle collision detection device has been proposed. This vehicle collision detection device includes a bumper absorber disposed in a bumper of a vehicle, a hollow tube member mounted in a groove formed in the bumper absorber along the vehicle width direction, and a pressure in the tube member. And a pressure sensor for detection. When a pedestrian or the like collides with the front of the vehicle, the tube member is deformed simultaneously with the deformation of the bumper cover while the bumper absorber absorbs the shock. At this time, the pressure in the tube member rises, and the collision between the vehicle and the pedestrian is detected based on detecting the pressure change by the pressure sensor.
特表2014-505629号公報Special table 2014-505629
 さて、上述したチューブ式の車両用衝突検知装置では、車両と歩行者等との衝突時において、バンパカバーの変形に伴って変形するバンパアブソーバの車両前後方向の変形量と、チューブ部材の車両前後方向の変形量との間に所定の関係がある。すなわち、チューブ部材の車両前後方向の変形量は、バンパアブソーバの車両前後方向の変形量に比例して大きくなる。 Now, in the above-described tube-type vehicle collision detection device, the amount of deformation in the vehicle longitudinal direction of the bumper absorber that deforms in accordance with the deformation of the bumper cover at the time of collision between the vehicle and a pedestrian, etc. There is a predetermined relationship between the amount of deformation in the direction. That is, the amount of deformation of the tube member in the vehicle front-rear direction increases in proportion to the amount of deformation of the bumper absorber in the vehicle front-rear direction.
 しかしながら、上記構成の車両用衝突検知装置では、チューブ部材における車両前方側の内壁面と車両後方側の内壁面とが接触した後、更にバンパアブソーバが車両後方側へ変形した場合、チューブ部材はそれ以上車両前後方向に変形し難い状態であるため、圧力センサによる圧力検出の出力が飽和状態になるという問題がある。 However, in the vehicle collision detection device having the above-described configuration, when the bumper absorber further deforms toward the vehicle rear side after the inner wall surface on the vehicle front side and the inner wall surface on the vehicle rear side of the tube member contact each other, the tube member As described above, since it is difficult to deform in the vehicle front-rear direction, there is a problem that the output of pressure detection by the pressure sensor is saturated.
 本開示は、上述した問題点に鑑みてなされたものであり、チューブ式の車両用衝突検知装置において、チューブ部材による圧力検出範囲を充分に確保可能な車両用衝突検知装置を提供することを目的とする。 The present disclosure has been made in view of the above-described problems, and an object of the present invention is to provide a vehicle collision detection device capable of sufficiently ensuring a pressure detection range by a tube member in a tube type vehicle collision detection device. And
 上記目的を解決するためになされた本開示の1つの態様の車両用衝突検知装置は、車両のバンパ内に配設されたバンパアブソーバと、バンパアブソーバの後面に車幅方向に沿って形成された溝部に装着されると共に剛性部材の車両前方側に配設される内部に中空部が形成された検出用チューブ部材と、中空部内の圧力を検出する圧力センサとを有し、圧力センサによる圧力検出結果に基づいてバンパへの物体の衝突を検知する。剛性部材の前面には、検出用チューブ部材に対向する位置に、衝突発生時にバンパアブソーバからの押圧により変形した検出用チューブ部材の少なくとも一部を収容可能な凹部が車幅方向に沿って形成されていることを特徴とする。 A vehicle collision detection device according to one aspect of the present disclosure made to solve the above object is formed with a bumper absorber disposed in a bumper of a vehicle and a rear surface of the bumper absorber along a vehicle width direction. A detection tube member mounted in the groove and disposed on the vehicle front side of the rigid member and having a hollow portion formed therein, and a pressure sensor for detecting the pressure in the hollow portion, pressure detection by the pressure sensor Based on the result, the collision of the object with the bumper is detected. On the front surface of the rigid member, a recess is formed along the vehicle width direction at a position facing the detection tube member so as to accommodate at least a part of the detection tube member deformed by the pressure from the bumper absorber when a collision occurs. It is characterized by.
 この構成によれば、剛性部材の前面における検出用チューブ部材に対向する位置に、車幅方向に沿って凹部が形成されているので、衝突発生時にバンパアブソーバからの押圧により変形した検出用チューブ部材の少なくとも一部を当該凹部に収容させることができる。これにより、バンパアブソーバが車両後方側へ変形した際に、検出用チューブ部材の車両前方側及び後方側の内壁面が接触してしまうことで、圧力センサによる圧力検出の出力が飽和状態になることを抑止できる。従って、車両用衝突検知装置の検出用チューブ部材による圧力検出範囲を充分に確保することができる。 According to this configuration, since the concave portion is formed along the vehicle width direction at the position facing the detection tube member on the front surface of the rigid member, the detection tube member deformed by the pressure from the bumper absorber when a collision occurs. At least a part of can be accommodated in the recess. As a result, when the bumper absorber is deformed to the vehicle rear side, the vehicle front side and rear side inner wall surfaces of the detection tube member come into contact with each other, and the pressure detection output by the pressure sensor becomes saturated. Can be suppressed. Therefore, a sufficient pressure detection range can be ensured by the detection tube member of the vehicle collision detection device.
 本開示についての上記目的およびその他の目的、特徴や利点は、添付の図面を参照しながら下記の詳細な記述により、より明確になる。その図面は、
第1の実施形態の車両用衝突検知装置の全体構成を示す図である。 図1のバンパ部の拡大図である。 図2のバンパ部のIII-III断面図である。 図3のバンパレインフォースメントの凹部の拡大断面図である。 第1の実施形態の検出用チューブ部材の変形が進んだ状態を示す図である。 第1の実施形態の検出用チューブ部材の車両前方側及び後方側の内壁面が接触した状態を示す図である。 参考例における図4相当図である。 第2の実施形態における図4相当図である。 第2の実施形態における図6相当図である。 第3の実施形態における図4相当図である。 第3の実施形態における図6相当図である。 第4の実施形態における車両用衝突検知装置の全体構成を示す図である。 図12のバンパ部の拡大図である。 図13のバンパ部のXIV-XIV断面図である。 図14のバンパレインフォースメントの凹部の拡大断面図である。
The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
1 is a diagram illustrating an overall configuration of a vehicle collision detection device according to a first embodiment. It is an enlarged view of the bumper part of FIG. FIG. 3 is a III-III cross-sectional view of the bumper portion of FIG. 2. It is an expanded sectional view of the recessed part of the bumper reinforcement of FIG. It is a figure which shows the state which the deformation | transformation of the tube member for a detection of 1st Embodiment advanced. It is a figure which shows the state which the inner wall surface of the vehicle front side and back side of the tube member for a detection of 1st Embodiment contacted. FIG. 5 is a view corresponding to FIG. 4 in a reference example. FIG. 5 is a diagram corresponding to FIG. 4 in the second embodiment. FIG. 7 is a view corresponding to FIG. 6 in the second embodiment. FIG. 5 is a diagram corresponding to FIG. 4 in a third embodiment. FIG. 7 is a view corresponding to FIG. 6 in the third embodiment. It is a figure which shows the whole structure of the collision detection apparatus for vehicles in 4th Embodiment. It is an enlarged view of the bumper part of FIG. FIG. 14 is a cross-sectional view of the bumper portion of FIG. 13 taken along XIV-XIV. It is an expanded sectional view of the recessed part of the bumper reinforcement of FIG.
(第1の実施形態)
 以下、第1の実施形態の車両用衝突検知装置について、図1~図7を参照して説明する。図1及び図2に示すように、本実施形態の車両用衝突検知装置1は、バンパアブソーバ2、検出用チューブ部材3、圧力センサ4、速度センサ5、衝突検知ECU6、バンパレインフォースメント9等を備えて構成される。この車両用衝突検知装置1は、車両前方に設けられたバンパ7への歩行者等の物体の衝突を検知するものである。このバンパ7は、図3に示すように、バンパカバー8、バンパアブソーバ2、バンパレインフォースメント9を主体として構成されている。
(First embodiment)
Hereinafter, the vehicle collision detection apparatus according to the first embodiment will be described with reference to FIGS. As shown in FIGS. 1 and 2, the vehicle collision detection device 1 of the present embodiment includes a bumper absorber 2, a detection tube member 3, a pressure sensor 4, a speed sensor 5, a collision detection ECU 6, a bumper reinforcement 9, and the like. It is configured with. The vehicle collision detection device 1 detects a collision of an object such as a pedestrian with a bumper 7 provided in front of the vehicle. As shown in FIG. 3, the bumper 7 is mainly composed of a bumper cover 8, a bumper absorber 2, and a bumper reinforcement 9.
 バンパアブソーバ2は、バンパレインフォースメント9の前面9aに設けられ、検出用チューブ部材3を囲むように配設される。このバンパアブソーバ2は、バンパ7において衝撃吸収の作用を受け持つ部材であり、例えば発泡ポリプロピレンなどからなる。 The bumper absorber 2 is provided on the front surface 9 a of the bumper reinforcement 9 and is disposed so as to surround the detection tube member 3. The bumper absorber 2 is a member responsible for shock absorption in the bumper 7, and is made of, for example, foamed polypropylene.
 バンパアブソーバ2の後面2bには、図3及び図4に示すように、検出用チューブ部材3を装着するための溝部2aが形成されている。この溝部2aは、矩形形状の断面を有し、車幅方向に沿って形成されている。また、溝部2aの車両前後方向の長さL2は、検出用チューブ部材3の車両前後方向の長さ(外径D)よりも所定長さだけ小さく設定されている。なお、溝部2aは、車幅方向の途中(例えば車幅方向中央部に設けられた意匠部分等)に上下方向に屈曲した屈曲部を有していてもよい。また、溝部2aの断面形状は矩形に限られず、例えば多角形や円形・楕円形等、適宜変更可能であるとする。 As shown in FIGS. 3 and 4, a groove 2 a for mounting the detection tube member 3 is formed on the rear surface 2 b of the bumper absorber 2. The groove 2a has a rectangular cross section and is formed along the vehicle width direction. The length L2 of the groove 2a in the vehicle front-rear direction is set to be smaller than the length of the detection tube member 3 in the vehicle front-rear direction (outer diameter D) by a predetermined length. In addition, the groove part 2a may have the bending part bent in the up-down direction in the middle (for example, the design part etc. provided in the vehicle width direction center part) in the vehicle width direction. In addition, the cross-sectional shape of the groove 2a is not limited to a rectangle, and can be appropriately changed to, for example, a polygon, a circle, or an ellipse.
 検出用チューブ部材3は、図1及び図2に示すように、内部に中空部3aが形成され、車幅方向(車両左右方向)に延びているチューブ状の部材であり、バンパアブソーバ2の上記溝部2aに装着されるものである。また、検出用チューブ部材3は、車両のバンパ7内におけるバンパレインフォースメント9の前面9a(車両前方側)に配設される。この検出用チューブ部材3の両端部は、バンパレインフォースメント9の車幅方向左右の外側にて、略コ字状に湾曲して後述する圧力センサ4に接続される。 As shown in FIGS. 1 and 2, the detection tube member 3 is a tube-like member having a hollow portion 3 a formed therein and extending in the vehicle width direction (vehicle left-right direction). It is attached to the groove 2a. The detection tube member 3 is disposed on the front surface 9a (the vehicle front side) of the bumper reinforcement 9 in the bumper 7 of the vehicle. Both ends of the tube member for detection 3 are curved in a substantially U shape and connected to a pressure sensor 4 to be described later on the left and right outer sides of the bumper reinforcement 9 in the vehicle width direction.
 この検出用チューブ部材3は、円形の断面形状を有し、合成ゴム、例えばシリコーンゴムからなる。検出用チューブ部材3の外径Dは、例えば8mm~12mm程度であるとする。また、検出用チューブ部材3の周壁の肉厚tは、例えば1mm~2mm程度であるとする。なお、検出用チューブ部材3の断面形状は、円形に限られず、四角形などの多角形であってもよい。また、検出用チューブ部材3の材質としては、他にもエチレンプロピレンゴム(EPDM)などでもよい。 The detection tube member 3 has a circular cross-sectional shape and is made of synthetic rubber, for example, silicone rubber. The outer diameter D of the detection tube member 3 is assumed to be about 8 mm to 12 mm, for example. Further, the wall thickness t of the peripheral wall of the detection tube member 3 is assumed to be about 1 mm to 2 mm, for example. The cross-sectional shape of the detection tube member 3 is not limited to a circle, but may be a polygon such as a quadrangle. In addition, the material of the tube member 3 for detection may be ethylene propylene rubber (EPDM) or the like.
 ここで、上述したように溝部2aの車両前後方向の長さL2は検出用チューブ部材3の車両前後方向の長さよりも小さいため、検出用チューブ部材3が溝部2aに装着された状態で、検出用チューブ部材3後部がバンパアブソーバ2の後面2bより所定長さだけ後方側へ突出する。本実施形態では、溝部2aの車両前後方向の長さL2=D-2tに設定されているため、検出用チューブ部材3が溝部2aに装着された状態で、検出用チューブ部材3の後部は、バンパアブソーバ2の後面2bより2tだけ後方側へ突出している。 Here, since the length L2 of the groove portion 2a in the vehicle front-rear direction is smaller than the length of the detection tube member 3 in the vehicle front-rear direction as described above, the detection is performed in a state where the detection tube member 3 is attached to the groove portion 2a. The rear portion of the tube member 3 projects from the rear surface 2b of the bumper absorber 2 to the rear side by a predetermined length. In the present embodiment, the length L2 of the groove 2a in the vehicle front-rear direction is set to D-2t. Therefore, in the state where the detection tube member 3 is mounted in the groove 2a, the rear portion of the detection tube member 3 is The bumper absorber 2 protrudes rearward by 2t from the rear surface 2b.
 圧力センサ4は、バンパレインフォースメント9の前面9aよりも車両後方側に配置される。具体的には、圧力センサ4は、バンパカバー7内の左右両端部側に2つ設置され、バンパレインフォースメント9の後面9bにボルト(図示しない)等で締結することにより固定されて取り付けられる。本実施形態では、このように圧力センサ4を2つ設置することにより、冗長性及び検出精度を確保している。 The pressure sensor 4 is disposed on the vehicle rear side with respect to the front surface 9a of the bumper reinforcement 9. Specifically, two pressure sensors 4 are installed on the left and right ends of the bumper cover 7, and are fixedly attached to the rear surface 9b of the bumper reinforcement 9 by fastening with bolts (not shown) or the like. . In this embodiment, redundancy and detection accuracy are ensured by installing two pressure sensors 4 in this way.
 この圧力センサ4は、図2に示すように、検出用チューブ部材3の左右両端部に接続され、検出用チューブ部材3の中空部3a内の圧力を検出するように構成されている。具体的には、圧力センサ4は、気体の圧力変化を検出するセンサ装置であり、検出用チューブ部材3の中空部3a内の空気の圧力変化を検出する。圧力センサ4は、図1に示すように、伝送線を介して衝突検知ECU(Electronic Control Unit)6に電気的に接続され、圧力に比例した信号を衝突検知ECU6へ出力する。衝突検知ECU6は、圧力センサ4による圧力検出結果に基づいて、バンパ7への歩行者の衝突を検知する。また、衝突検知ECU6は、歩行者保護装置10に電気的に接続されている。 As shown in FIG. 2, the pressure sensor 4 is connected to both left and right ends of the detection tube member 3, and is configured to detect the pressure in the hollow portion 3a of the detection tube member 3. Specifically, the pressure sensor 4 is a sensor device that detects a change in the pressure of the gas, and detects a change in the pressure of the air in the hollow portion 3 a of the detection tube member 3. As shown in FIG. 1, the pressure sensor 4 is electrically connected to a collision detection ECU (Electronic Control Unit) 6 via a transmission line, and outputs a signal proportional to the pressure to the collision detection ECU 6. The collision detection ECU 6 detects a pedestrian collision with the bumper 7 based on the pressure detection result by the pressure sensor 4. Further, the collision detection ECU 6 is electrically connected to the pedestrian protection device 10.
 速度センサ5は、車両の速度を検出するセンサ装置であり、衝突検知ECU6に信号線を介して電気的に接続されている。この速度センサ5は、車両速度に比例した信号を衝突検知ECU6へ送信する。 The speed sensor 5 is a sensor device that detects the speed of the vehicle, and is electrically connected to the collision detection ECU 6 via a signal line. The speed sensor 5 transmits a signal proportional to the vehicle speed to the collision detection ECU 6.
 衝突検知ECU6は、CPUを主体として構成され、車両用衝突検知装置1の動作全般を制御するものであり、圧力センサ4、速度センサ5、歩行者保護装置10のそれぞれに電気的に接続されている(図1参照)。衝突検知ECU6には、圧力センサ4からの圧力信号(圧力データ)、速度センサ5からの速度信号(速度データ)等が入力される。衝突検知ECU6は、圧力センサ4による圧力検出結果(入力信号)及び速度センサ5による速度検出結果(入力信号)に基づいて、所定の衝突判定処理を実行し、バンパ7への歩行者等の物体の衝突を検知した場合には歩行者保護装置10を作動させる。 The collision detection ECU 6 is composed mainly of a CPU and controls the overall operation of the vehicle collision detection apparatus 1, and is electrically connected to each of the pressure sensor 4, the speed sensor 5, and the pedestrian protection apparatus 10. (See FIG. 1). The collision detection ECU 6 receives a pressure signal (pressure data) from the pressure sensor 4, a speed signal (speed data) from the speed sensor 5, and the like. The collision detection ECU 6 executes a predetermined collision determination process based on the pressure detection result (input signal) by the pressure sensor 4 and the speed detection result (input signal) by the speed sensor 5, and an object such as a pedestrian to the bumper 7 When a collision is detected, the pedestrian protection device 10 is activated.
 バンパ7は、車両の衝突時における衝撃を和らげるためのものであり、バンパカバー8、バンパアブソーバ2、バンパレインフォースメント9等から構成される。バンパカバー8は、バンパ7の構成部品を覆うように設けられ、ポリプロピレン等の樹脂製の部材である。このバンパカバー8は、バンパ7の外観を構成すると同時に、車両全体の外観の一部を構成するものとなっている。 The bumper 7 is for reducing an impact at the time of a vehicle collision, and includes a bumper cover 8, a bumper absorber 2, a bumper reinforcement 9, and the like. The bumper cover 8 is provided so as to cover the components of the bumper 7 and is a resin member such as polypropylene. The bumper cover 8 constitutes the appearance of the bumper 7 and at the same time constitutes a part of the appearance of the entire vehicle.
 バンパレインフォースメント9は、バンパカバー8内に配設されて車幅方向に延びるアルミニウム等の金属製の剛性部材であって、図3に示すように、内部中央に梁が設けられた日の字状断面を有する中空部材である。また、バンパレインフォースメント9は、車両前方側の面(前面9a)と、車両後方側の面(後面9b)とを有している。このバンパレインフォースメント9は、図1及び図2に示すように、車両前後方向に延びる一対の金属製部材であるサイドメンバ11の前端に取り付けられる。 The bumper reinforcement 9 is a rigid member made of metal such as aluminum that is disposed in the bumper cover 8 and extends in the vehicle width direction. As shown in FIG. A hollow member having a letter-shaped cross section. The bumper reinforcement 9 has a vehicle front side surface (front surface 9a) and a vehicle rear side surface (rear surface 9b). As shown in FIGS. 1 and 2, the bumper reinforcement 9 is attached to the front end of a side member 11 that is a pair of metal members extending in the vehicle front-rear direction.
 通常、車両の衝突事故においては、車両の進行方向(車両前方)に存在する歩行者や車両と衝突する場合が多い。このため、本実施形態では、圧力センサ4をバンパレインフォースメント9の後面9bに配設して、車両前方の歩行者や車両との衝突に伴う衝撃(外力)が、車両前方に設けられたバンパカバー8等から圧力センサ4に直接伝わることをバンパレインフォースメント9の存在によって保護している。 Usually, in a vehicle collision accident, there are many cases where the vehicle collides with a pedestrian or a vehicle existing in the traveling direction of the vehicle (front of the vehicle). For this reason, in this embodiment, the pressure sensor 4 is disposed on the rear surface 9b of the bumper reinforcement 9, and an impact (external force) associated with a collision with a pedestrian or vehicle in front of the vehicle is provided in front of the vehicle. The bumper reinforcement 9 protects the direct transmission from the bumper cover 8 or the like to the pressure sensor 4.
 そして、本実施形態では、図4に示すように、バンパレインフォースメント9の前面9aに、凹部9cが車幅方向全体に亘って形成されている。この凹部9cは、車両側方から見た断面形状が矩形形状となっている。また、凹部9cは、溝部2aに装着された検出用チューブ部材3に対向する位置に、車幅方向に沿って設けられている。 And in this embodiment, as shown in FIG. 4, the recessed part 9c is formed in the front surface 9a of the bumper reinforcement 9 over the whole vehicle width direction. The recess 9c has a rectangular cross-sectional shape as viewed from the side of the vehicle. Moreover, the recessed part 9c is provided along the vehicle width direction in the position which opposes the detection tube member 3 with which the groove part 2a was mounted | worn.
 具体的には、凹部9cは、当該凹部9cを形成する内壁の上端面が溝部2aの上端面よりも車両上方側に位置し、且つ当該凹部9cを形成する内壁の下端面が溝部2aの下端面よりも車両下方側に位置している。 Specifically, the recess 9c is such that the upper end surface of the inner wall that forms the recess 9c is positioned above the vehicle upper side than the upper end surface of the groove 2a, and the lower end surface of the inner wall that forms the recess 9c is below the groove 2a. It is located on the vehicle lower side than the end face.
 また、本実施形態の凹部9cの車両前後方向の長さLcは、検出用チューブ部材3の周壁の肉厚tの2倍の長さ、すなわち2tに設定されている。なお、長さLcの大きさは2tに限られず、長さLc>0であればよい。特に、長さLcの範囲は、t≦Lc≦2tであればよい。 Further, the length Lc in the vehicle front-rear direction of the concave portion 9c of the present embodiment is set to twice the thickness t of the peripheral wall of the detection tube member 3, that is, 2t. Note that the length Lc is not limited to 2t, and the length Lc may be greater than zero. In particular, the range of the length Lc may be t ≦ Lc ≦ 2t.
 また、凹部9cの車両上下方向の長さHcは、検出用チューブ部材3の外径D(車両上下方向の長さ)よりも長く設定されている。具体的には、凹部9cの車両上下方向の長さHcは、検出用チューブ部材3の車両前方側及び後方側の内壁面(内周側壁面)どうしが接触し、検出用チューブ部材3の中空部3aが潰れ切った時の上下寸法、この場合、π ×(D-2t)/2+2tよりも長く設定されているものとする。 Further, the length Hc of the concave portion 9c in the vehicle vertical direction is set longer than the outer diameter D (length in the vehicle vertical direction) of the detection tube member 3. Specifically, the length Hc of the concave portion 9c in the vehicle vertical direction is such that the inner wall surfaces (inner wall surfaces) of the detection tube member 3 on the vehicle front side and the rear side are in contact with each other, and the detection tube member 3 is hollow. The vertical dimension when the part 3a is crushed is assumed to be longer than π × (D−2t) / 2 + 2t in this case.
 本実施形態では、バンパアブソーバ2の溝部2aに検出用チューブ部材3が装着された後、上述した凹部9cが形成されたバンパレインフォースメント9が、バンパアブソーバ2の後面2bに当接した状態で組み付けられる。このとき、検出用チューブ部材3は、当該検出用チューブ部材3の少なくとも一部(車両後方側部分等)が凹部9cに収容された状態で配置される。なお、検出用チューブ部材3の外径Dは、L2+Lcの長さと略同等となっている。 In the present embodiment, after the detection tube member 3 is mounted in the groove 2a of the bumper absorber 2, the bumper reinforcement 9 in which the above-described recess 9c is formed is in contact with the rear surface 2b of the bumper absorber 2. Assembled. At this time, the detection tube member 3 is arranged in a state in which at least a part of the detection tube member 3 (a vehicle rear side portion or the like) is accommodated in the recess 9c. The outer diameter D of the detection tube member 3 is substantially equal to the length of L2 + Lc.
 歩行者保護装置10としては、例えばポップアップフードを用いる。このポップアップフードは、車両の衝突検知後瞬時に、エンジンフードの後端を上昇させ、歩行者とエンジン等の硬い部品との間隔(クリアランス)を増加させ、そのスペースを用いて歩行者の頭部への衝突エネルギーを吸収し、歩行者の頭部への衝撃を低減させるものである。なお、ポップアップフードの代わりに、車体外部のエンジンフード上からフロントウインド下部にかけてエアバッグを展開させて歩行者の衝撃を緩衝するカウルエアバッグ等を用いてもよい。 For example, a pop-up hood is used as the pedestrian protection device 10. This pop-up hood instantly raises the rear end of the engine hood after a vehicle collision is detected, increases the clearance (clearance) between the pedestrian and hard parts such as the engine, and uses that space to make the pedestrian's head The impact energy on the pedestrian is absorbed and the impact on the pedestrian's head is reduced. Instead of the pop-up hood, a cowl airbag or the like that cushions a pedestrian's impact by deploying the airbag from the engine hood outside the vehicle body to the lower part of the front window may be used.
 次に、本実施形態における車両用衝突検知装置1の衝突時の動作について、図5及び図6を参照して説明する。車両と歩行者等との衝突が発生すると、歩行者等との衝突による衝撃(外力)により、バンパ7のバンパカバー8が車両後方側へ変形する。続いて、バンパカバー7の変形に伴って、図5に示すように、バンパアブソーバ2が衝撃を吸収しながら車両後方側へ変形すると同時に、検出用チューブ部材3が車両前後方向に潰れるように変形する。このとき、検出用チューブ部材3の中空部3a内の圧力が急上昇し、この圧力変化が圧力センサ4に伝達する。そして、検出用チューブ部材3の変形は、図6に示すように、当該検出用チューブ部材3の車両前方側及び後方側の内壁面どうしが接触するまで継続する。なお、図5及び図6における黒塗り矢印は外力の働く方向を指し示している。 Next, the operation at the time of collision of the vehicle collision detection apparatus 1 in the present embodiment will be described with reference to FIGS. When a collision between the vehicle and a pedestrian or the like occurs, the bumper cover 8 of the bumper 7 is deformed to the vehicle rear side by an impact (external force) due to the collision with the pedestrian or the like. Subsequently, as the bumper cover 7 is deformed, as shown in FIG. 5, the bumper absorber 2 is deformed to the vehicle rear side while absorbing the impact, and at the same time, the detection tube member 3 is deformed so as to be crushed in the vehicle front-rear direction. To do. At this time, the pressure in the hollow portion 3 a of the detection tube member 3 rises rapidly, and this pressure change is transmitted to the pressure sensor 4. And the deformation | transformation of the tube member 3 for a detection is continued until the inner wall surface of the vehicle front side of the said tube member 3 for a detection and the back side contacts as shown in FIG. In addition, the black arrow in FIG.5 and FIG.6 has pointed out the direction where an external force acts.
 ここで、バンパアブソーバ2の変形量と、検出用チューブ部材3の変形量との間には、所定の関係がある。すなわち、バンパアブソーバ2の変形量をx1、検出用チューブ部材3の変形量をx2とし、衝突前のバンパアブソーバ2の車両前後方向の長さをL1、衝突前の検出用チューブ部材3の車両前後方向の長さをL2とすると、次式に示す関係がある。なお、バンパアブソーバ2の変形量は、検出用チューブ部材3に減衰して伝達されるものであるが、この減衰量は微小であるので無視するものとする。 Here, there is a predetermined relationship between the deformation amount of the bumper absorber 2 and the deformation amount of the detection tube member 3. That is, the deformation amount of the bumper absorber 2 is x1, the deformation amount of the detection tube member 3 is x2, the length of the bumper absorber 2 before the collision in the vehicle longitudinal direction is L1, and the detection tube member 3 before the collision of the vehicle tube When the length in the direction is L2, there is a relationship represented by the following equation. The amount of deformation of the bumper absorber 2 is attenuated and transmitted to the detection tube member 3, but this amount of attenuation is very small and is ignored.
 L2/L1=x2/x1・・・(式1)
 上記した(式1)において、検出用チューブ部材3の周壁の肉厚tを考慮すると、検出用チューブ部材3が車両前後方向に変形可能な変形量は、x2-2・tとなる。これは、検出用チューブ部材3の車両前方側の内壁面と車両後方側の内壁面とが接触した場合に相当する。このように検出用チューブ部材3の周壁の肉厚tを考慮して(式1)を修正すると、次式が得られる。
L2 / L1 = x2 / x1 (Formula 1)
In the above (Equation 1), taking into account the wall thickness t of the peripheral wall of the detection tube member 3, the amount of deformation that the detection tube member 3 can deform in the vehicle front-rear direction is x2-2 · t. This corresponds to the case where the inner wall surface of the detection tube member 3 on the vehicle front side and the inner wall surface on the vehicle rear side are in contact with each other. In this way, when (Equation 1) is corrected in consideration of the wall thickness t of the peripheral wall of the detection tube member 3, the following equation is obtained.
 x1=(x2-2・t)×(L1/L2)・・・(式2)
 上記した(式2)において、例えば、L1=80[mm]、L2=8[mm](検出用チューブ部材3の外径D=8[mm])、t=2[mm](検出用チューブ部材3の周壁の肉厚t=2mm)である場合(ケースA)について考える。この場合、x1=(x2-4)・10という関係式が成り立つ。
x1 = (x2-2 · t) × (L1 / L2) (Expression 2)
In the above (Formula 2), for example, L1 = 80 [mm], L2 = 8 [mm] (the outer diameter D of the detection tube member 3 = 8 [mm]), t = 2 [mm] (the detection tube) Consider the case (case A) where the peripheral wall thickness of the member 3 is t = 2 mm. In this case, the relational expression x1 = (x2-4) · 10 is established.
 ここで、図7の参考例に示されるように、バンパレインフォースメント9の前面9aに凹部9cが形成されていない場合には、検出用チューブ部材3の変形量x2の最大値は、検出用チューブ部材3の外径Dに等しく8[mm]となる。このとき、(式2)により、x1=(8-4)・10=40[mm]となる。つまり、バンパアブソーバ2の車両前後方向の変形量x1が40mmよりも大きくなると、検出用チューブ部材3の車両前方側及び後方側の内壁面が接触した状態(底付き状態)となり、それ以上車両前後方向に変形し難くなるため、圧力センサ4により検出される圧力の出力が飽和状態になる。一方、バンパアブソーバ2の変形量x1の最大値は、バンパアブソーバ2の車両前後方向長さL1に等しく80mmである。従って、ケースAでは、検出用チューブ部材3の最大変形量によって検出可能なバンパアブソーバ2の変形量は、40÷80×100により、50%であることになる。つまり、残りの50%に相当するバンパアブソーバ2の変形量に関しては、検出用チューブ部材3の変形によって検出できないことになる。 Here, as shown in the reference example of FIG. 7, when the concave portion 9c is not formed on the front surface 9a of the bumper reinforcement 9, the maximum value of the deformation amount x2 of the detection tube member 3 is the detection value. The outer diameter D of the tube member 3 is equal to 8 [mm]. At this time, according to (Expression 2), x1 = (8-4) · 10 = 40 [mm]. That is, when the deformation amount x1 of the bumper absorber 2 in the vehicle front-rear direction is greater than 40 mm, the vehicle front side and rear side inner wall surfaces of the detection tube member 3 are in contact with each other (bottomed state). Since it becomes difficult to deform in the direction, the pressure output detected by the pressure sensor 4 is saturated. On the other hand, the maximum deformation amount x1 of the bumper absorber 2 is 80 mm, which is equal to the length L1 of the bumper absorber 2 in the vehicle front-rear direction. Therefore, in the case A, the deformation amount of the bumper absorber 2 that can be detected by the maximum deformation amount of the detection tube member 3 is 50% by 40 ÷ 80 × 100. That is, the amount of deformation of the bumper absorber 2 corresponding to the remaining 50% cannot be detected by the deformation of the detection tube member 3.
 そこで、本実施形態では、バンパレインフォースメント9の前面9aに、上述した凹部9cを形成することにより、バンパアブソーバ2の変形量x1が大きくなっても、検出用チューブ部材3を充分に変形可能な構成としている。具体的には、バンパアブソーバ2からの押圧により車両後方側へ外力が加わると、検出用チューブ部材3は、当該検出用チューブ部材3の少なくとも一部(車両後方側部分等)が凹部9cに収容された状態で車両後方側へ変形する(図5参照)。この凹部9cの車両前後方向の長さをLcとすると、(式2)は以下に示すように修正される。 Therefore, in the present embodiment, by forming the above-described recess 9c in the front surface 9a of the bumper reinforcement 9, the detection tube member 3 can be sufficiently deformed even when the deformation amount x1 of the bumper absorber 2 increases. It has a simple structure. Specifically, when an external force is applied to the vehicle rear side by pressing from the bumper absorber 2, at least a part of the tube member for detection 3 (such as a vehicle rear side portion) is accommodated in the recess 9c. In this state, the vehicle is deformed rearward (see FIG. 5). When the length of the concave portion 9c in the vehicle front-rear direction is Lc, (Equation 2) is corrected as shown below.
 x1=(x2-2・t)×(L1/(L2-Lc))・・・(式3)
 上記した(式3)において、上記ケースAと同様に、L1=80[mm]、L2=8[mm](検出用チューブ部材3の外径D=8[mm])、t=2[mm](検出用チューブ部材3の周壁の肉厚2mm)であるとする。そして、本実施形態では、凹部9cの車両前後方向の長さLc=2t=4[mm]であると設定する。この場合、x1=(x2-4)・(80/4)という関係式が成り立つ。なお、凹部9cの車両前後方向の長さLcは、検出用チューブ部材3の周壁の肉厚t以上で、検出用チューブ部材3の周壁の肉厚の2倍である2t以下の範囲で適宜設定可能であるものとする。
x1 = (x2-2 · t) × (L1 / (L2-Lc)) (Formula 3)
In the above (formula 3), similarly to the case A, L1 = 80 [mm], L2 = 8 [mm] (the outer diameter D of the detection tube member 3 = 8 [mm]), t = 2 [mm ] (The wall thickness of the peripheral wall of the detection tube member 3 is 2 mm). In this embodiment, the length Lc = 2t = 4 [mm] in the vehicle longitudinal direction of the recess 9c is set. In this case, the relational expression x1 = (x2-4) · (80/4) holds. The length Lc of the recess 9c in the vehicle front-rear direction is appropriately set within a range of 2 t or less, which is equal to or greater than the thickness t of the peripheral wall of the detection tube member 3 and twice the thickness of the peripheral wall of the detection tube member 3. It shall be possible.
 ここで、x2の最大値は、検出用チューブ部材3の外径Dに等しく8[mm]である。このとき、x1=(8-4)・20=80[mm]となる。一方、バンパアブソーバ2の変形量x1の最大値は80mmである。従って、検出用チューブ部材3の最大変形量によって検出可能なバンパアブソーバ2の変形量は、80÷80×100により、100%とすることができる。このように、検出用チューブ部材3の変形によって、バンパアブソーバ2の車両前後方向における最大変形量を100%検出可能とすることができる。これにより、車両用衝突検知装置1において、圧力センサ4による検出用チューブ部材3の中空部3a内の圧力検出範囲を拡大させることを可能としている。 Here, the maximum value of x2 is equal to the outer diameter D of the detection tube member 3 and is 8 [mm]. At this time, x1 = (8-4) · 20 = 80 [mm]. On the other hand, the maximum deformation amount x1 of the bumper absorber 2 is 80 mm. Therefore, the deformation amount of the bumper absorber 2 that can be detected by the maximum deformation amount of the detection tube member 3 can be 100% by 80 ÷ 80 × 100. Thus, the deformation of the tube member for detection 3 can detect the maximum deformation amount of the bumper absorber 2 in the longitudinal direction of the vehicle 100%. Thereby, in the vehicle collision detection device 1, the pressure detection range in the hollow portion 3 a of the detection tube member 3 by the pressure sensor 4 can be expanded.
 上述の「圧力検出範囲」とは、衝突時におけるバンパカバー8の変形に伴ってバンパアブソーバ2が車両後方側へ変形した際に、検出用チューブ部材3が変形し始めてから、検出用チューブ部材3の車両前方側及び後方側の内壁面が接触して圧力センサ4により検出される圧力の出力が飽和状態になるまでの、圧力センサ4による圧力変化の検出可能範囲を意味している。なお、凹部9cの車両前後方向の長さLcの場合の圧力検出範囲(圧力検出レンジ)は、次式により算出される。 The above-mentioned “pressure detection range” refers to the detection tube member 3 after the detection tube member 3 starts to be deformed when the bumper absorber 2 is deformed to the vehicle rear side along with the deformation of the bumper cover 8 at the time of collision. This means a range in which a pressure change can be detected by the pressure sensor 4 until the output of the pressure detected by the pressure sensor 4 becomes saturated when the inner wall surfaces of the vehicle front side and the rear side of the vehicle come into contact with each other. In addition, the pressure detection range (pressure detection range) in the case of the length Lc in the vehicle front-rear direction of the recess 9c is calculated by the following equation.
 (L2-2・t)/(L2-Lc)×100・・・(式4)
 上式により、例えば、L2=8、t=2、Lc=tのとき、検出レンジは、(8-2・2)/(8-2)×100=66.7%となる。また、L2=8、t=2、Lc=2tのとき、検出レンジは、(8-2・2)/(8-2・2)×100=100%となる。
(L2-2 · t) / (L2-Lc) × 100 (Formula 4)
From the above equation, for example, when L2 = 8, t = 2, and Lc = t, the detection range is (8-2 · 2) / (8-2) × 100 = 66.7%. When L2 = 8, t = 2, and Lc = 2t, the detection range is (8-2 · 2) / (8-2 · 2) × 100 = 100%.
 また、車両用衝突検知装置1の衝突検知ECU6は、圧力センサ4及び速度センサ5の検知結果に基づいて、所定の衝突判定処理を実行する。この衝突判定処理では、圧力センサ4及び速度センサ5の検出結果に基づいて、例えば衝突物の有効質量を算出し、この有効質量が所定の閾値より大きい場合、歩行者との衝突が発生したものと判定し、更に車両速度が所定の範囲(例えば時速25km~55kmの範囲)内である場合に、歩行者保護装置10の作動を要する歩行者との衝突が発生したものと判定する。 Also, the collision detection ECU 6 of the vehicle collision detection device 1 executes a predetermined collision determination process based on the detection results of the pressure sensor 4 and the speed sensor 5. In this collision determination process, for example, the effective mass of the collision object is calculated based on the detection results of the pressure sensor 4 and the speed sensor 5, and when this effective mass is larger than a predetermined threshold, a collision with a pedestrian has occurred. Further, when the vehicle speed is within a predetermined range (for example, a range of 25 km to 55 km / h), it is determined that a collision with a pedestrian that requires the operation of the pedestrian protection device 10 has occurred.
 ここで、「有効質量」とは、衝突時における圧力センサ4の検出値より、運動量と力積の関係を利用して算出する質量をいう。車両と物体との衝突が発生した場合、歩行者とは質量の異なる衝突物では、検知される圧力センサ4の値が異なる。このため、人体の有効質量と、想定される他の衝突物の質量との間に閾値を設定することにより、衝突物の種類を切り分けることが可能となる。この有効質量は、次式に示すように、圧力センサ4により検出される圧力の値の所定時間における定積分値を、速度センサ5により検出される車両速度で割ることにより算出される。 Here, the “effective mass” refers to a mass calculated using the relationship between momentum and impulse from the detection value of the pressure sensor 4 at the time of collision. When a collision between a vehicle and an object occurs, the value of the detected pressure sensor 4 is different for a collision object having a mass different from that of a pedestrian. For this reason, by setting a threshold value between the effective mass of the human body and the mass of another assumed collision object, it is possible to classify the types of the collision object. This effective mass is calculated by dividing the constant integral value of the pressure value detected by the pressure sensor 4 at a predetermined time by the vehicle speed detected by the speed sensor 5 as shown in the following equation.
 M=(∫P(t)dt)/V・・・(式5)
 なお、Mは有効質量、Pは所定時間における圧力センサ4による検出値、tは所定時間(例えば、数ms~数十ms)、Vは速度センサ5により検出される衝突時の車両速度を示している。有効質量を算出する方法には、他にも、衝突した物体の運動エネルギーEを表す式E=1/2・MV2を用いて算出することが可能である。この場合、有効質量は、M=2・E/V2により算出される。
M = (∫P (t) dt) / V (Expression 5)
M is an effective mass, P is a value detected by the pressure sensor 4 at a predetermined time, t is a predetermined time (for example, several ms to several tens of ms), and V is a vehicle speed at the time of collision detected by the speed sensor 5. ing. As another method for calculating the effective mass, it is possible to calculate using an equation E = 1/2 · MV 2 representing the kinetic energy E of the collided object. In this case, the effective mass is calculated by M = 2 · E / V 2 .
 そして、衝突検知ECU6は、歩行者保護装置10の作動を要する歩行者との衝突が発生したと判定した場合、歩行者保護装置10を作動させる制御信号を出力し、歩行者保護装置10を作動させて、上記したように歩行者への衝撃を低減させる。 When the collision detection ECU 6 determines that a collision has occurred with a pedestrian that requires the pedestrian protection device 10 to operate, the collision detection ECU 6 outputs a control signal for operating the pedestrian protection device 10 to operate the pedestrian protection device 10. Let the impact on the pedestrian be reduced as described above.
 以上説明したように、第1の実施形態の車両用衝突検知装置1は、車両のバンパ7内に配設されたバンパアブソーバ2と、バンパアブソーバ2の後面2bに車幅方向に沿って形成された溝部2aに装着されると共にバンパレインフォースメント9(剛性部材)の車両前方側に配設される内部に中空部3aが形成された検出用チューブ部材3と、検出用チューブ部材3の中空部3a内の圧力を検出する圧力センサ4とを有し、圧力センサ4による圧力検出結果に基づいてバンパ7への歩行者等の物体の衝突を検知する。そして、バンパレインフォースメント9の前面9aには、検出用チューブ部材3に対向する位置に、衝突発生時にバンパアブソーバ2からの押圧により変形した検出用チューブ部材3の少なくとも一部を収容可能な凹部9cが車幅方向に沿って形成されていることを特徴とする。 As described above, the vehicle collision detection apparatus 1 of the first embodiment is formed along the vehicle width direction on the bumper absorber 2 disposed in the bumper 7 of the vehicle and the rear surface 2b of the bumper absorber 2. A tube member for detection 3 in which a hollow portion 3a is formed inside a bumper reinforcement 9 (rigid member) that is mounted in the groove portion 2a, and a hollow portion of the tube member for detection 3. And a pressure sensor 4 that detects the pressure in 3a, and detects the collision of an object such as a pedestrian against the bumper 7 based on the pressure detection result by the pressure sensor 4. The front surface 9a of the bumper reinforcement 9 is a recess capable of accommodating at least a part of the detection tube member 3 deformed by the pressure from the bumper absorber 2 when a collision occurs at a position facing the detection tube member 3. 9c is formed along the vehicle width direction.
 この構成によれば、バンパレインフォースメント9(剛性部材)の前面9aにおける検出用チューブ部材3に対向する位置に、車幅方向に沿って凹部9cが形成されているので、衝突発生時にバンパアブソーバ2からの押圧により変形した検出用チューブ部材3の少なくとも一部を当該凹部9cに収容させることができる。これにより、バンパアブソーバ2が車両後方側へ変形した際に、検出用チューブ部材3の車両前方側及び後方側の内壁面が接触してしまうことで、圧力センサ4による圧力検出の出力が飽和状態になることを抑止できる。従って、車両用衝突検知装置1の検出用チューブ部材3による圧力検出範囲を充分に確保することができる。 According to this configuration, since the concave portion 9c is formed along the vehicle width direction at the position facing the detection tube member 3 on the front surface 9a of the bumper reinforcement 9 (rigid member), the bumper absorber is generated when a collision occurs. At least a part of the detection tube member 3 deformed by the pressure from 2 can be accommodated in the recess 9c. Thereby, when the bumper absorber 2 is deformed to the vehicle rear side, the vehicle front side and rear side inner wall surfaces of the detection tube member 3 come into contact with each other, so that the pressure detection output by the pressure sensor 4 is saturated. Can be prevented. Therefore, a sufficient pressure detection range by the detection tube member 3 of the vehicle collision detection device 1 can be secured.
 更に、バンパアブソーバ2の後面2bに溝部2aが形成されているので、検出用チューブ部材3をバンパレインフォースメント9の車両前方側に安定して配置できるとともに、検出用チューブ部材3をバンパアブソーバ2へ組付け易くできる。 Further, since the groove portion 2a is formed on the rear surface 2b of the bumper absorber 2, the detection tube member 3 can be stably disposed on the vehicle front side of the bumper reinforcement 9, and the detection tube member 3 is disposed on the bumper absorber 2. Easy to assemble.
 また、バンパレインフォースメント9は、凹部9cを除く前面9aがバンパアブソーバ2の後面2bに当接していることを特徴とする。この構成によれば、バンパアブソーバ2の後面2bとバンパレインフォースメント9の前面9a(凹部9cを除く)とが当接しているので、車両と歩行者等との衝突に伴う衝撃(外力)を剛性部材であるバンパレインフォースメント9により確実に受け止めることができる。これにより、検出用チューブ部材3が車両後方側に撓むことを確実に防止でき、正確に衝突検知を行うことができる。更に、検出用チューブ部材3が溝部2aから脱落することを防止でき、検出用チューブ部材3を溝部2aに安定して配置することができる。 Further, the bumper reinforcement 9 is characterized in that the front surface 9a excluding the recess 9c is in contact with the rear surface 2b of the bumper absorber 2. According to this configuration, the rear surface 2b of the bumper absorber 2 and the front surface 9a of the bumper reinforcement 9 (excluding the concave portion 9c) are in contact with each other, so that an impact (external force) associated with a collision between the vehicle and a pedestrian or the like is applied. The bumper reinforcement 9 which is a rigid member can be reliably received. Thereby, it can prevent reliably that the tube member 3 for a detection is bent to the vehicle rear side, and can perform a collision detection correctly. Furthermore, it is possible to prevent the detection tube member 3 from dropping from the groove 2a, and the detection tube member 3 can be stably disposed in the groove 2a.
 また、凹部9cの車両前後方向の長さLcは、検出用チューブ部材3の周壁の肉厚t以上、且つ検出用チューブ部材3の周壁の肉厚の2倍以下に設定されたことを特徴とする。 The length Lc of the concave portion 9c in the vehicle front-rear direction is set to be not less than the thickness t of the peripheral wall of the detection tube member 3 and not more than twice the thickness of the peripheral wall of the detection tube member 3. To do.
 この構成によれば、検出用チューブ部材3の車両後方側に、車両前後方向の長さLcが検出用チューブ部材3の周壁の肉厚t以上、且つ検出用チューブ部材3の周壁の肉厚の2倍以下である凹部9cが設けられているので、バンパアブソーバ2の車両前後方向の変形量に比例して検出用チューブ部材3を充分に変形させることができる。 According to this configuration, on the vehicle rear side of the detection tube member 3, the length Lc in the vehicle front-rear direction is equal to or greater than the wall thickness t of the peripheral wall of the detection tube member 3 and the wall thickness of the peripheral wall of the detection tube member 3. Since the concave portion 9c that is twice or less is provided, the detection tube member 3 can be sufficiently deformed in proportion to the deformation amount of the bumper absorber 2 in the vehicle front-rear direction.
 これにより、車両用衝突検知装置1において、圧力センサ4による検出用チューブ部材3の中空部3a内の圧力検出範囲を確実に拡大させることができる。更に、凹部9cの車両前後方向の長さLcが大きくなり過ぎて、衝突時に検出用チューブ部材3が車両後方側へ撓むように変形することを防ぐことができ、検出用チューブ部材3を適切に変形させることができる。例えば、上記したケースAの場合には、凹部9cがない場合50%である圧力検出範囲(圧力検出レンジ)を、66.7%~100%まで拡大することができる。 Thereby, in the vehicle collision detection device 1, the pressure detection range in the hollow portion 3a of the tube member 3 for detection by the pressure sensor 4 can be reliably expanded. Further, the length Lc of the concave portion 9c in the vehicle front-rear direction can be prevented from being excessively large, and the detection tube member 3 can be prevented from being deformed so as to bend toward the vehicle rear side at the time of a collision. Can be made. For example, in the case A described above, the pressure detection range (pressure detection range), which is 50% when there is no recess 9c, can be expanded to 66.7% to 100%.
 また、凹部9cの車両前後方向の長さLcは、検出用チューブ部材3の周壁の肉厚の2倍に設定されたことを特徴とする。この構成によれば、圧力センサ4による検出用チューブ部材3の中空部3a内の圧力検出範囲をより効果的に拡大させることができる。すなわち、上述したように、検出用チューブ部材3の最大変形量によって検出可能なバンパアブソーバ2の変形量を100%とすることができる。例えば、上記したケースAの場合には、凹部9cがない場合50%である圧力検出範囲を100%まで拡大することができる。 Further, the length Lc of the concave portion 9c in the vehicle front-rear direction is set to be twice the thickness of the peripheral wall of the detection tube member 3. According to this structure, the pressure detection range in the hollow part 3a of the tube member 3 for detection by the pressure sensor 4 can be expanded more effectively. That is, as described above, the deformation amount of the bumper absorber 2 that can be detected by the maximum deformation amount of the detection tube member 3 can be set to 100%. For example, in the case A described above, the pressure detection range, which is 50% when there is no recess 9c, can be expanded to 100%.
 また、凹部9cの車両上下方向の長さHcは、検出用チューブ部材3の車両上下方向の長さよりも長く設定されたことを特徴とする。この構成によれば、凹部9cの車両上下方向の長さHcは、検出用チューブ部材3の車両上下方向の長さよりも長く設定されているので、凹部9cにおける検出用チューブ部材3の変形スペースを充分に確保することができ、凹部9cの上側及び下側の内壁面の存在により、検出用チューブ部材3の変形が阻害されることを防止できる。特に、本実施形態では、凹部9cの車両上下方向の長さHcは、検出用チューブ部材3の中空部3aが潰れ切った時の上下寸法よりも長く設定されているので、検出用チューブ部材3の車両前方側及び後方側の内壁面どうしが接触するまで検出用チューブ部材3を適切に変形させることができる。 Further, the length Hc of the concave portion 9c in the vehicle vertical direction is set to be longer than the length of the detection tube member 3 in the vehicle vertical direction. According to this configuration, since the length Hc of the concave portion 9c in the vehicle vertical direction is set to be longer than the length of the detection tube member 3 in the vertical direction of the vehicle, the deformation space of the detection tube member 3 in the concave portion 9c is reduced. It can be ensured sufficiently, and the presence of the upper and lower inner wall surfaces of the recess 9c can prevent the deformation of the detection tube member 3 from being hindered. In particular, in the present embodiment, the length Hc of the concave portion 9c in the vehicle vertical direction is set to be longer than the vertical dimension when the hollow portion 3a of the detection tube member 3 is crushed. The detection tube member 3 can be appropriately deformed until the inner wall surfaces of the vehicle front side and the rear side of the vehicle come into contact with each other.
 また、本実施形態では、圧力センサ4をバンパレインフォースメント9の後面9bの左右両端部側に2つ配設することにより、検出用チューブ部材3における圧力変化を高い精度で検知できるとともに、冗長性を確保できる。すなわち、2つの圧力センサ4の出力を用いて衝突判定を行うことによって、誤検知を防止して正確な衝突検知を行うことができる。更に、圧力センサ4をバンパレインフォースメント9にボルト等の締結により固定したので、圧力センサ4を確実に固定することができ、衝突時に圧力センサ4が外力により外れたり損傷したりすることを防止できる。
(第2の実施形態)
 次に、第2の実施形態について、図8、図9を参照して説明する。なお、図8、図9には上記第1の実施形態と同一部分には同一の符号を付して説明を省略し、異なる部分についてだけ説明する。
In the present embodiment, by arranging two pressure sensors 4 on the left and right end portions of the rear surface 9b of the bumper reinforcement 9, it is possible to detect a pressure change in the detection tube member 3 with high accuracy and to provide redundancy. Can be secured. That is, by performing collision determination using the outputs of the two pressure sensors 4, it is possible to prevent erroneous detection and perform accurate collision detection. Furthermore, since the pressure sensor 4 is fixed to the bumper reinforcement 9 by fastening a bolt or the like, the pressure sensor 4 can be securely fixed, and the pressure sensor 4 is prevented from being detached or damaged by an external force at the time of a collision. it can.
(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. In FIGS. 8 and 9, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted, and only different parts are described.
 第2の実施形態においては、バンパレインフォースメント9の前面9aに、車両側方から見た断面形状が半円形形状の凹部9dが、車幅方向全体に亘って形成されている。凹部9dは、図8に示すように、車両上下方向の長さが車両後方側へいく程短くなるように、内壁面が曲線状に傾斜して形成されている。この凹部9dは、溝部2aに装着された検出用チューブ部材3に対向する位置に、車幅方向に沿って設けられている。 In the second embodiment, a concave portion 9d having a semicircular cross section as viewed from the side of the vehicle is formed on the front surface 9a of the bumper reinforcement 9 over the entire vehicle width direction. As shown in FIG. 8, the recess 9 d has an inner wall surface inclined in a curved shape so that the length in the vertical direction of the vehicle becomes shorter toward the vehicle rear side. The recess 9d is provided along the vehicle width direction at a position facing the detection tube member 3 mounted in the groove 2a.
 具体的には、凹部9dは、当該凹部9dを形成する内壁の最上部が溝部2aの上端面よりも車両上方側に位置し、且つ当該凹部9dを形成する内壁の最下部が溝部2aの下端面よりも車両下方側に位置している。 Specifically, the concave portion 9d is such that the uppermost portion of the inner wall forming the concave portion 9d is located above the upper end surface of the groove portion 2a and the lowermost portion of the inner wall forming the concave portion 9d is below the groove portion 2a. It is located on the vehicle lower side than the end face.
 また、第2の実施形態の凹部9dの車両前後方向の長さLcは、検出用チューブ部材3の周壁の肉厚tの長さに設定されている。なお、長さLcの大きさはtに限られず、長さLc>0であればよい。特に、長さLcの範囲は、t≦Lc≦2tであればよい。 Further, the length Lc of the concave portion 9d in the second embodiment in the vehicle front-rear direction is set to the length of the wall thickness t of the peripheral wall of the detection tube member 3. Note that the length Lc is not limited to t, and the length Lc may be greater than zero. In particular, the range of the length Lc may be t ≦ Lc ≦ 2t.
 また、凹部9dの開口部における車両上下方向の長さHcは、検出用チューブ部材3の外径D(車両上下方向の長さ)よりも長く設定されている。具体的には、凹部9dの開口部における車両上下方向の長さHcは、検出用チューブ部材3の中空部3aが潰れ切った時の上下寸法よりも長く設定されている。 The length Hc in the vehicle vertical direction at the opening of the recess 9d is set to be longer than the outer diameter D (length in the vehicle vertical direction) of the detection tube member 3. Specifically, the vehicle vertical length Hc at the opening of the recess 9d is set to be longer than the vertical dimension when the hollow portion 3a of the detection tube member 3 is crushed.
 また、第1の実施形態と同様に、バンパアブソーバ2の溝部2aに検出用チューブ部材3が装着された後、上述した凹部9dが形成されたバンパレインフォースメント9が、バンパアブソーバ2の後面2bに当接した状態で組み付けられる。このとき、検出用チューブ部材3は、当該検出用チューブ部材3の少なくとも一部(車両後方側部分等)が凹部9dに収容された状態で配置される。なお、検出用チューブ部材3の外径Dは、L2+Lcの長さと略同等となっている。 Similarly to the first embodiment, after the detection tube member 3 is mounted in the groove 2a of the bumper absorber 2, the bumper reinforcement 9 in which the above-described recess 9d is formed is formed on the rear surface 2b of the bumper absorber 2. Assembled in contact with the At this time, the detection tube member 3 is arranged in a state in which at least a part of the detection tube member 3 (a vehicle rear side portion or the like) is accommodated in the recess 9d. The outer diameter D of the detection tube member 3 is substantially equal to the length of L2 + Lc.
 この第2の実施形態においても、第1の実施形態と同様の効果を得ることができる。特に、凹部9dは、車両側方から見た断面形状が半円形となっているので、図9に示すように、円形の検出用チューブ3がバンパアブソーバ2の変形に伴って車両後方側へ変形した際に、検出用チューブ部材3を安定して収容することができる。更に、凹部9dの外形形状が検出用チューブ3の外形形状と整合したものであるので、検出用チューブ3が凹部9dの角部等と衝突して損傷する等の不具合が生じることを防止できる。これにより、車両用衝突検知装置1の検出用チューブ部材3による圧力検出範囲を確実に拡大させることができる。
(第3の実施形態)
 次に、第3の実施形態について、図10、図11を参照して説明する。なお、図10、図11には上記第1の実施形態と同一部分には同一の符号を付して説明を省略し、異なる部分についてだけ説明する。
Also in the second embodiment, the same effect as in the first embodiment can be obtained. In particular, since the recess 9d has a semicircular cross-sectional shape when viewed from the side of the vehicle, the circular detection tube 3 is deformed toward the vehicle rear side as the bumper absorber 2 is deformed, as shown in FIG. When it does, the tube member 3 for a detection can be accommodated stably. Furthermore, since the outer shape of the recess 9d matches the outer shape of the detection tube 3, it is possible to prevent the detection tube 3 from colliding with the corners of the recess 9d and being damaged. Thereby, the pressure detection range by the tube member 3 for detection of the collision detection apparatus 1 for vehicles can be expanded reliably.
(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. In FIG. 10 and FIG. 11, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts will be described.
 第3の実施形態においては、バンパレインフォースメント9の前面9aに、車両側方から見た断面形状が三角形形状である凹部9eが、車幅方向全体に亘って形成されている。凹部9eは、図10に示すように、車両上下方向の長さが車両後方側へいく程短くなるように、内壁面がテーパ状に傾斜して形成されている。この凹部9eは、溝部2aに装着された検出用チューブ部材3に対向する位置に、車幅方向に沿って設けられている。 In the third embodiment, a recess 9e having a triangular cross-sectional shape viewed from the side of the vehicle is formed on the front surface 9a of the bumper reinforcement 9 over the entire vehicle width direction. As shown in FIG. 10, the concave portion 9e has an inner wall surface inclined in a taper shape so that the length in the vehicle vertical direction becomes shorter toward the vehicle rear side. The recess 9e is provided along the vehicle width direction at a position facing the detection tube member 3 attached to the groove 2a.
 具体的には、凹部9eは、当該凹部9eを形成する内壁の最上部が溝部2aの上端面よりも車両上方側に位置し、当該凹部9eを形成する内壁の最下部が溝部2aの下端面よりも車両下方側に位置している。 Specifically, the concave portion 9e is such that the uppermost portion of the inner wall forming the concave portion 9e is positioned on the vehicle upper side of the upper end surface of the groove portion 2a, and the lowermost portion of the inner wall forming the concave portion 9e is the lower end surface of the groove portion 2a. It is located on the vehicle lower side.
 また、第3の実施形態の凹部9eの車両前後方向の長さLcは、検出用チューブ部材3の周壁の肉厚tの長さに設定されている。なお、長さLcの大きさはtに限られず、長さLc>0であればよい。特に、長さLcの範囲は、t≦Lc≦2tであればよい。 Further, the length Lc in the vehicle front-rear direction of the concave portion 9e of the third embodiment is set to the length of the wall thickness t of the peripheral wall of the detection tube member 3. Note that the length Lc is not limited to t, and the length Lc may be greater than zero. In particular, the range of the length Lc may be t ≦ Lc ≦ 2t.
 また、凹部9eの開口部における車両上下方向の長さHcは、検出用チューブ部材3の外径D(車両上下方向の長さ)よりも長く、特に、検出用チューブ部材3の中空部3aが潰れ切った時の上下寸法よりも長く設定されていてもよい。 Further, the length Hc in the vehicle vertical direction at the opening of the recess 9e is longer than the outer diameter D (length in the vehicle vertical direction) of the detection tube member 3, and in particular, the hollow portion 3a of the detection tube member 3 is. It may be set longer than the vertical dimension when it is crushed.
 また、第1の実施形態と同様に、バンパアブソーバ2の溝部2aに検出用チューブ部材3が装着された後、上述した凹部9eが形成されたバンパレインフォースメント9が、バンパアブソーバ2の後面2bに当接した状態で組み付けられる。このとき、検出用チューブ部材3は、当該検出用チューブ部材3の少なくとも一部(車両後方側部分等)が凹部9eに収容された状態で配置される。なお、検出用チューブ部材3の外径Dは、L2+Lcの長さと略同等となっている。 Similarly to the first embodiment, after the detection tube member 3 is mounted in the groove 2a of the bumper absorber 2, the bumper reinforcement 9 in which the above-described recess 9e is formed is provided on the rear surface 2b of the bumper absorber 2. Assembled in contact with the At this time, the detection tube member 3 is arranged in a state in which at least a part (the vehicle rear side portion or the like) of the detection tube member 3 is accommodated in the recess 9e. The outer diameter D of the detection tube member 3 is substantially equal to the length of L2 + Lc.
 この第3の実施形態においても、第1の実施形態と同様の効果を得ることができる。特に、図11の丸囲い線で示されるように、衝突発生時に円形の検出用チューブ部材3が凹部9e内における2点と当接しながら変形するので、検出用チューブ部材3が車両上下方向にずれることなく、検出用チューブ部材3を安定して変形させることができる。
(第4の実施形態)
 次に、第4の実施形態について、図12~図15を参照して説明する。なお、図12~図15には上記第1の実施形態と同一部分には同一の符号を付して説明を省略し、異なる部分についてだけ説明する。この第4の実施形態においては、図14及び図15に示すように、バンパレインフォースメント9の車両前方側に、凹部12cを有する背面部材12(剛性部材)が設けられている。
Also in the third embodiment, the same effect as in the first embodiment can be obtained. In particular, as shown by the circled line in FIG. 11, when the collision occurs, the circular detection tube member 3 is deformed while coming into contact with two points in the recess 9e, so that the detection tube member 3 is shifted in the vehicle vertical direction. Therefore, the detection tube member 3 can be stably deformed.
(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. In FIG. 12 to FIG. 15, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts will be described. In the fourth embodiment, as shown in FIGS. 14 and 15, a back member 12 (rigid member) having a recess 12 c is provided on the vehicle front side of the bumper reinforcement 9.
 背面部材12は、図12及び図13に示すように、車両前方側の面(前面12a)と、車両後方側の面(後面12b)とを有して構成され、バンパアブソーバ2とバンパレインフォースメント9との間に車幅方向全体に亘って配設される。この背面部材12は、車両前方からの衝撃に伴う外力を受けるための剛性部材であり、例えばポリエチレン(PE)、ポリブチレンテレフタレート(PBT)等からなる。なお、背面部材12の材質としては、発泡樹脂からなるバンパアブソーバ2のように、衝突時に変形して衝撃を吸収する作用を有する部材を含まないものとする。 As shown in FIGS. 12 and 13, the rear member 12 is configured to include a front surface (front surface 12 a) and a rear surface (rear surface 12 b), and the bumper absorber 2 and the bumper reinforcement. Between the vehicle 9 and the vehicle 9 in the vehicle width direction. The back member 12 is a rigid member for receiving an external force accompanying an impact from the front of the vehicle, and is made of, for example, polyethylene (PE), polybutylene terephthalate (PBT), or the like. The material of the back member 12 does not include a member having a function of absorbing an impact by being deformed at the time of collision like the bumper absorber 2 made of foamed resin.
 背面部材12の前面12aには、凹部12cが車幅方向全体に亘って形成されている。この凹部12cは、車両側方から見た断面形状が矩形形状となっている。また、凹部12cは、溝部2aに装着された検出用チューブ部材3に対向する位置に、車幅方向に沿って設けられている。 A recess 12c is formed in the front surface 12a of the back member 12 over the entire vehicle width direction. The recess 12c has a rectangular shape as viewed from the side of the vehicle. Moreover, the recessed part 12c is provided along the vehicle width direction in the position which opposes the detection tube member 3 with which the groove part 2a was mounted | worn.
 具体的には、図15に示すように、凹部12cは、当該凹部12cを形成する内壁の上端面が溝部2aの上端面よりも車両上方側に位置し、当該凹部12cを形成する内壁の下端面が溝部2aの下端面よりも車両下方側に位置している。 Specifically, as shown in FIG. 15, the recess 12c has an upper end surface of the inner wall that forms the recess 12c located on the vehicle upper side of the upper end surface of the groove 2a, and a lower portion of the inner wall that forms the recess 12c. The end surface is located on the vehicle lower side than the lower end surface of the groove 2a.
 また、第4の実施形態の凹部12cの車両前後方向の長さLcは、検出用チューブ部材3の周壁の肉厚tの2倍の長さ、すなわち、2tに設定されている。なお、長さLcの大きさはtに限られず、長さLc>0であればよい。特に、長さLcの範囲は、t≦Lc≦2tであればよい。 Further, the length Lc of the concave portion 12c in the fourth embodiment in the vehicle front-rear direction is set to a length twice the wall thickness t of the peripheral wall of the detection tube member 3, that is, 2t. Note that the length Lc is not limited to t, and the length Lc may be greater than zero. In particular, the range of the length Lc may be t ≦ Lc ≦ 2t.
 また、凹部12cの車両上下方向の長さHcは、検出用チューブ部材3の外径D(車両上下方向の長さ)よりも長く設定されている。具体的には、凹部12cの車両上下方向の長さHcは、検出用チューブ部材3の車両前方側及び後方側の内壁面(内周側壁面)どうしが接触し、検出用チューブ部材3の中空部3aが潰れ切った時の上下寸法、この場合、π ×(D-2t)/2+2t)よりも長く設定されているものとする。 Further, the length Hc of the recess 12c in the vehicle vertical direction is set to be longer than the outer diameter D (length in the vehicle vertical direction) of the detection tube member 3. Specifically, the length Hc of the concave portion 12c in the vehicle vertical direction is such that the inner wall surfaces (inner wall surfaces) on the vehicle front side and the rear side of the detection tube member 3 are in contact with each other, and the detection tube member 3 is hollow. The vertical dimension when the part 3a is crushed is assumed to be longer than π × (D−2t) / 2 + 2t) in this case.
 また、第4の実施形態では、バンパアブソーバ2の溝部2aに検出用チューブ部材3が装着された後、上述した凹部12cが形成された背面部材12が、バンパアブソーバ2の後面2bに当接した状態で組み付けられる。このとき、検出用チューブ部材3は、当該検出用チューブ部材3の少なくとも一部(車両後方側部分等)が凹部12cに収容された状態で配置される。なお、検出用チューブ部材3の外径Dは、L2+Lcの長さと略同等となっている。 Further, in the fourth embodiment, after the detection tube member 3 is mounted in the groove portion 2 a of the bumper absorber 2, the back member 12 in which the concave portion 12 c is formed contacts the rear surface 2 b of the bumper absorber 2. It is assembled in the state. At this time, the detection tube member 3 is arranged in a state where at least a part of the detection tube member 3 (a vehicle rear side portion or the like) is accommodated in the recess 12c. The outer diameter D of the detection tube member 3 is substantially equal to the length of L2 + Lc.
 更に、背面部材12の車両後方側には、バンパレインフォースメント9が配設される。バンパレインフォースメント9は、その前面9aが背面部材12の後面12bに車幅方向全体にて当接した状態で配置される。 Further, a bumper reinforcement 9 is disposed on the rear side of the rear member 12 in the vehicle. The bumper reinforcement 9 is disposed in a state in which the front surface 9a is in contact with the rear surface 12b of the back member 12 in the entire vehicle width direction.
 以上説明した第4の実施形態の車両用衝突検知装置1では、車両のバンパ7内に配設されたバンパアブソーバ2と、バンパアブソーバ2の後面2bに車幅方向に沿って形成された溝部2aに装着されると共に背面部材12の車両前方側に配設される内部に中空部3aが形成された検出用チューブ部材3と、検出用チューブ部材3の中空部3a内の圧力を検出する圧力センサ4とを有し、圧力センサ4による圧力検出結果に基づいてバンパ7への物体(歩行者)の衝突を検知する。 In the vehicle collision detection device 1 of the fourth embodiment described above, the bumper absorber 2 disposed in the bumper 7 of the vehicle, and the groove 2a formed along the vehicle width direction on the rear surface 2b of the bumper absorber 2. And a detection tube member 3 in which a hollow portion 3a is formed inside the rear member 12 disposed on the front side of the vehicle, and a pressure sensor for detecting a pressure in the hollow portion 3a of the detection tube member 3 4 and detects the collision of an object (pedestrian) with the bumper 7 based on the pressure detection result by the pressure sensor 4.
 背面部材12の前面12aには、検出用チューブ部材3に対向する位置に、衝突発生時にバンパアブソーバ2からの押圧により変形した検出用チューブ部材3の少なくとも一部を収容可能な凹部12cが車幅方向に沿って形成されている。そして、背面部材12は、バンパレインフォースメント9の車両前方側に配設され、バンパレインフォースメント9とは別部材であることを特徴とする。 On the front surface 12a of the back member 12, a recess 12c that can accommodate at least a part of the detection tube member 3 deformed by the pressure from the bumper absorber 2 at the time of occurrence of a collision is provided at a position facing the detection tube member 3. It is formed along the direction. The back member 12 is disposed on the vehicle front side of the bumper reinforcement 9 and is a separate member from the bumper reinforcement 9.
 この第4の実施形態によっても、上記第1の実施形態と同様の効果を得ることができる。特に、バンパレインフォースメント9に凹部を設ける必要がないので、既存のバンパレインフォースメント9の車両前方側に、凹部12cを有する背面部材12を配置することで、車両用衝突検知装置1の検出用チューブ部材3による圧力検出範囲を拡大させることが可能となる。 Also in the fourth embodiment, the same effect as in the first embodiment can be obtained. In particular, since it is not necessary to provide a recess in the bumper reinforcement 9, the rear member 12 having the recess 12c is disposed on the front side of the existing bumper reinforcement 9 so that the vehicle collision detection device 1 can detect the bumper reinforcement 9. It is possible to expand the pressure detection range by the tube member 3 for use.
 上記実施形態の変形例について以下に述べる。本開示は、上記した実施形態に限定されるものではなく、本開示の主旨を逸脱しない範囲で種々の変形又は拡張を施すことができる。例えば、上記実施形態では、圧力センサ4をバンパレインフォースメント9の後面9bに取り付けるものとしたが、これに限られず、圧力センサ4の配設位置は適宜変更可能であるものとする。 A modification of the above embodiment will be described below. The present disclosure is not limited to the above-described embodiment, and various modifications or extensions can be made without departing from the gist of the present disclosure. For example, in the above embodiment, the pressure sensor 4 is attached to the rear surface 9b of the bumper reinforcement 9. However, the present invention is not limited to this, and the arrangement position of the pressure sensor 4 can be changed as appropriate.
 また、上記実施形態では、衝突判定処理において、有効質量が所定の閾値以上になった場合に歩行者保護装置10の作動を要する歩行者との衝突が発生したと判定するものとしたが、これに限られず、例えば、圧力センサ4により検出された圧力の値、圧力変化率等を衝突判定の閾値として用いてもよい。 In the above embodiment, in the collision determination process, it is determined that a collision with a pedestrian that requires the operation of the pedestrian protection device 10 has occurred when the effective mass exceeds a predetermined threshold. For example, a pressure value detected by the pressure sensor 4, a pressure change rate, or the like may be used as a threshold for collision determination.
 また、上記実施形態では、検出用チューブ部材3が溝部2aに装着された状態で、当該検出用チューブ部材3後部がバンパアブソーバ2の後面2bより所定長さだけ車両後方側へ突出するものとしたが、これに限られない。例えば、バンパアブソーバ2の溝部2aの車両前後方向の長さと、検出用チューブ部材3の車両前後方向の長さとが同等である場合にも、本開示を適用可能である。 Further, in the above embodiment, the rear portion of the detection tube member 3 protrudes from the rear surface 2b of the bumper absorber 2 to the vehicle rear side by a predetermined length in a state where the detection tube member 3 is mounted in the groove portion 2a. However, it is not limited to this. For example, the present disclosure can also be applied when the length of the groove 2a of the bumper absorber 2 in the vehicle front-rear direction is equal to the length of the detection tube member 3 in the vehicle front-rear direction.
 本開示は、実施例に準拠して記述されたが、本開示は当該実施例や構造に限定されるものではないと理解される。本開示は、様々な変形例や均等範囲内の変形をも包含する。加えて、様々な組み合わせや形態、さらには、それらに一要素のみ、それ以上、あるいはそれ以下、を含む他の組み合わせや形態をも、本開示の範疇や思想範囲に入るものである。

 
Although the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims (8)

  1.  車両のバンパ(7)内に配設されたバンパアブソーバ(2)と、前記バンパアブソーバ(2)の後面(2b)に車幅方向に沿って形成された溝部に装着されると共に剛性部材(9,12)の車両前方側に配設される内部に中空部(3a)が形成された検出用チューブ部材(3)と、前記中空部(3a)内の圧力を検出する圧力センサ(4)とを有し、前記圧力センサ(4)による圧力検出結果に基づいて前記バンパ(7)への物体の衝突を検知する車両用衝突検知装置(1)において、
     前記剛性部材(9,12)の前面(9a,12a)には、前記検出用チューブ部材(3)に対向する位置に、衝突発生時に前記バンパアブソーバ(2)からの押圧により変形した前記検出用チューブ部材(3)の少なくとも一部を収容可能な凹部(9c,9d,9e,12c)が車幅方向に沿って形成されていることを特徴とする車両用衝突検知装置。
    A bumper absorber (2) disposed in the bumper (7) of the vehicle, and a rigid member (9) mounted on a rear surface (2b) of the bumper absorber (2) along the vehicle width direction. , 12) a tube member for detection (3) in which a hollow portion (3a) is formed inside disposed on the vehicle front side, and a pressure sensor (4) for detecting the pressure in the hollow portion (3a). In a vehicle collision detection device (1) for detecting a collision of an object with the bumper (7) based on a pressure detection result by the pressure sensor (4),
    On the front surface (9a, 12a) of the rigid member (9, 12), the detection member deformed by a pressure from the bumper absorber (2) at the position facing the detection tube member (3) when a collision occurs. A vehicle collision detection device, wherein recesses (9c, 9d, 9e, 12c) capable of accommodating at least a part of the tube member (3) are formed along the vehicle width direction.
  2.  前記剛性部材(9,12)は、前記凹部(9c,9d,9e,12c)を除く前面が前記バンパアブソーバ(2)の前記後面(2b)に当接していることを特徴とする請求項1に記載の車両用衝突検知装置。 The said rigid member (9,12) is contacting the said rear surface (2b) of the said bumper absorber (2b) except the said recessed part (9c, 9d, 9e, 12c). The vehicle collision detection device according to claim 1.
  3.  前記凹部(9c,9d,9e,12c)の車両前後方向の長さ(Lc)は、前記検出用チューブ部材(3)の周壁の肉厚(t)以上、且つ前記検出用チューブ部材(3)の周壁の肉厚の2倍(2t)以下に設定されたことを特徴とする請求項1または2に記載の車両用衝突検知装置。 The length (Lc) in the vehicle front-rear direction of the recesses (9c, 9d, 9e, 12c) is equal to or greater than the wall thickness (t) of the peripheral wall of the detection tube member (3), and the detection tube member (3). The vehicle collision detection device according to claim 1, wherein the collision detection device is set to be equal to or less than twice (2 t) the wall thickness of the peripheral wall.
  4.  前記凹部(9c,9d,9e,12c)の車両前後方向の長さ(Lc)は、前記検出用チューブ部材(3)の周壁の肉厚の2倍(2t)に設定されたことを特徴とする請求項3に記載の車両用衝突検知装置。 The length (Lc) in the vehicle front-rear direction of the recesses (9c, 9d, 9e, 12c) is set to be twice (2t) the wall thickness of the peripheral wall of the detection tube member (3). The vehicle collision detection device according to claim 3.
  5.  前記凹部(9c,9d,9e,12c)の車両上下方向の長さ(Hc)は、前記検出用チューブ部材(3)の車両上下方向の長さよりも長く設定されたことを特徴とする請求項1から4のいずれか一項に記載の車両用衝突検知装置。 The length (Hc) in the vehicle vertical direction of the recesses (9c, 9d, 9e, 12c) is set longer than the length in the vehicle vertical direction of the detection tube member (3). The vehicle collision detection device according to any one of 1 to 4.
  6.  前記剛性部材(9)は、バンパレインフォースメント(9)であることを特徴とする請求項1から5のいずれか一項に記載の車両用衝突検知装置。 The vehicular collision detection device according to any one of claims 1 to 5, wherein the rigid member (9) is a bumper reinforcement (9).
  7.  前記剛性部材(12)は、バンパレインフォースメント(9)の車両前方側に配設された別部材(12)であることを特徴とする請求項1から5のいずれか一項に記載の車両用衝突検知装置。 The vehicle according to any one of claims 1 to 5, wherein the rigid member (12) is a separate member (12) disposed on the vehicle front side of the bumper reinforcement (9). Collision detection device.
  8.  前記凹部(9c,9d,9e,12c)の車両側方から見た断面形状は、矩形、半円形、三角形のうちのいずれか一つであることを特徴とすることを請求項1から7のいずれか一項に記載の車両用衝突検知装置。

     
    The cross-sectional shape of the concave portion (9c, 9d, 9e, 12c) viewed from the side of the vehicle is any one of a rectangle, a semicircle, and a triangle. The vehicle collision detection device according to claim 1.

PCT/JP2015/005824 2014-11-26 2015-11-24 Vehicle collision sensing device WO2016084362A1 (en)

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