WO2016129251A1

WO2016129251A1 - Vehicle impact detection device

Info

Publication number: WO2016129251A1
Application number: PCT/JP2016/000555
Authority: WO
Inventors: 吉田　智一; 田辺　貴敏; 往広斉藤; 大祐中根; 皓太天野
Original assignee: 株式会社デンソー
Priority date: 2015-02-09
Filing date: 2016-02-03
Publication date: 2016-08-18
Also published as: DE112016000665B4; DE112016000665T5; JP6432376B2; JP2016145003A

Abstract

A vehicle impact detection device (1) having a bumper absorber (2) positioned on the vehicle-front side of a bumper reinforcement (9) inside a vehicle bumper (7), a detection tube member (3) having a hollow section (3a) formed in the interior thereof and mounted in a groove section (2c) formed so as to extend in the vehicle widthwise direction of the bumper absorber (2), and a pressure sensor (4) for detecting the pressure inside the hollow section (3a) of the detection tube member (3), wherein an impact of the bumper (7) with an object is detected on the basis of the pressure detection results from the pressure sensor (4). Furthermore, the detection tube member (3) is mounted in the groove section (2c) in a manner such that at least one section thereof in the vehicle widthwise direction is compressed by only a prescribed amount in the vehicle front-rear direction.

Description

Vehicle collision detection device

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2015-23229 filed on Feb. 9, 2015, the contents of which are incorporated herein by reference.

The present disclosure relates to a vehicle collision detection device for detecting a collision with a pedestrian or the like of a vehicle.

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.

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.

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 along the vehicle width direction on the rear surface of the bumper absorber, And a pressure sensor for detecting pressure. 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 with the pedestrian of the vehicle is detected based on detecting this pressure change by the pressure sensor.

Special table 2014-505629

By the way, in the vehicle collision detection device having the above-described configuration, when a bumper absorber collides with a pedestrian or the like at a position where the length (thickness) of the bumper absorber in the longitudinal direction of the vehicle is long (thick), the bumper absorber is deformed. In some cases, it takes time for the detection tube member to deform. Even in this case, there is a problem that it is necessary to detect the collision without delay and to activate the pedestrian protection device at an appropriate timing.

This indication is made in view of the subject mentioned above, and aims at providing the collision detection device for vehicles which made the rise of the output of the pressure sensor at the time of a collision quick in the tube type vehicle collision detection device. To do.

A vehicle collision detection device according to a first aspect of the present disclosure made to solve the above object includes a bumper absorber disposed in a vehicle front side of a bumper reinforcement in a bumper of the vehicle, and a vehicle mounted on the bumper absorber. A tube member for detection in which a hollow portion is formed in a groove portion formed extending in the width direction, and a pressure sensor for detecting pressure in the hollow portion of the tube member for detection, and the pressure by the pressure sensor The collision of the object with the bumper is detected based on the detection result. The detection tube member is attached to the groove part in a state in which at least a part in the vehicle width direction is crushed by a predetermined amount in the vehicle front-rear direction.

According to this configuration, by attaching the detection tube member to the groove in a state where at least a part in the vehicle width direction is previously crushed by a predetermined amount in the vehicle front-rear direction, the pressure sensor in at least a part of the detection tube member The rise of the output can be accelerated. Thereby, the collision detection accuracy of the vehicle collision detection device can be improved.

In addition, the vehicle collision detection device according to the second aspect of the present disclosure is formed in the bumper of the vehicle, the bumper absorber disposed on the vehicle front side of the bumper reinforcement, and the bumper absorber extending in the vehicle width direction. A tube member for detection in which a hollow portion is formed inside the groove portion, and a pressure sensor for detecting the pressure in the hollow portion of the tube member for detection, to the bumper based on the pressure detection result by the pressure sensor The collision of the object is detected. The length of the groove in the vehicle front-rear direction differs at the position in the vehicle width direction, and the length in the vehicle front-rear direction in at least part of the vehicle width direction is shorter than the length of the detection tube member in the vehicle front-rear direction. It is characterized by.

According to this configuration, the length of the groove portion in the vehicle front-rear direction in at least a portion in the vehicle width direction is made shorter than the length of the detection tube member in the vehicle front-rear direction, so that the detection tube attached to this portion. The member can be previously crushed by a predetermined amount in the vehicle longitudinal direction. Thereby, the rise of the output of the pressure sensor of the said part can be made early, and the collision detection precision of the collision detection apparatus for vehicles can be improved.

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 sectional view taken along the line III-III in FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. It is an enlarged view of the groove part of FIG. It is a figure which shows the relationship between the front-back length of the groove part of 1st Embodiment, and the output of a pressure sensor. It is a figure which shows the output of the pressure sensor at the time of the collision in the vehicle width direction center part side of the bumper of 1st Embodiment. FIG. 3 is a view corresponding to FIG. 2 in the second embodiment. FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8. FIG. 9 is a sectional view taken along line XX in FIG. 8. FIG. 10 is a view corresponding to FIG. 2 in the third embodiment. FIG. 12 is a sectional view taken along line XII-XII in FIG. FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 11. FIG. 13 is a view corresponding to FIG. 12 and illustrating an arrangement structure of pressing members in the fourth embodiment. It is a figure which shows the modification of the arrangement position of a press member.

(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.

The bumper absorber 2 includes a front surface 2a that is a front surface of the vehicle and a rear surface 2b that is a rear surface of the vehicle, and is disposed at a position facing the front surface 9a of the bumper reinforcement 9. The bumper absorber 2 is a member responsible for shock absorption in the bumper 7, and is made of, for example, foamed polypropylene.

In addition, the length A (thickness) of the bumper absorber 2 in the vehicle front-rear direction differs depending on the position in the vehicle width direction (see FIG. 2). Specifically, the front-rear length A1 of the bumper absorber 2 at the vehicle width direction center portion side (center portion) shown in FIG. 3 is equal to the front and rear lengths of the bumper absorber 2 at the vehicle width direction end portion side (corner portion) shown in FIG. It is longer (thicker) than the length A2. The length A1 is about 65 mm, for example. The length A2 is about 30 mm, for example.

As shown in FIGS. 3 and 4, a groove 2 c for mounting the detection tube member 3 is formed on the rear surface 2 b of the bumper absorber 2. The groove 2c has a rectangular cross section and is formed along the vehicle width direction. The groove portion 2c has an opening surface 2d on the vehicle rear side, and the detection tube member 3 is mounted from the opening surface 2d. The rear surface 2 b of the bumper absorber 2 is in contact with the front surface 9 a of the bumper reinforcement 9. Further, the bumper absorber 2 and the bumper reinforcement 9 are fitted and fixed by fitting portions (not shown) provided respectively.

The length L in the vehicle front-rear direction of the groove 2c differs depending on the position in the vehicle width direction, and is set according to the length A (thickness) of the bumper absorber 2 in the vehicle front-rear direction (see FIG. 2). That is, the groove part 2c is formed so that the length L of the groove part 2c in the vehicle front-rear direction becomes shorter as the vehicle width direction position of the bumper absorber 2 in the vehicle front-rear direction becomes longer. In this case, the longitudinal length L1 of the groove portion 2c on the vehicle width direction center portion side (center portion) shown in FIG. 3 is larger than the longitudinal length L2 of the groove portion 2c on the vehicle width direction end portion side (corner portion) shown in FIG. Is also shorter. The length A in the vehicle front-rear direction of the bumper absorber 2 is the front-rear length from the front surface 2a of the bumper absorber 2 to the opening surface 2d of the groove 2c.

Specifically, the longitudinal length L1 of the groove 2c on the vehicle width direction center portion side (center portion) shown in FIG. 3 is a predetermined length longer than the longitudinal length (outer diameter D) of the detection tube member 3 in the vehicle. It is set so short. The outer diameter D is a length in a state before the detection tube member 3 is attached to the groove 2c. Specifically, while the outer diameter D of the detection tube member 3 of the present embodiment is about 8 mm, the longitudinal length L1 of the groove 2c in the center portion is about 7 mm. That is, the longitudinal length L1 of the groove 2c in the center portion is shorter by about 1 mm than the outer diameter D of the tube member 3 for detection. Accordingly, the detection tube member 3 on the center side in the vehicle width direction is mounted in the groove 2c in a state where it is crushed by about 1 mm in the vehicle front-rear direction.

On the other hand, the longitudinal length L2 of the groove 2c on the vehicle width direction end portion (corner portion) shown in FIG. 4 is approximately the same as the longitudinal length (outer diameter D) of the detection tube member 3 in the vehicle. Is set. As described above, in this embodiment, the longitudinal length L1 of the groove 2c on the vehicle width direction center portion side (center portion) where the longitudinal length A of the bumper absorber 2 is long is made shorter than the longitudinal length of the detection tube member 3. The longitudinal length L2 of the groove 2c on the vehicle width direction end portion (corner portion) side other than the center portion is set to be approximately the same as the longitudinal length of the detection tube member 3. Further, as shown in FIG. 5, the length H of the groove 2c in the vehicle vertical direction is set to be longer than the length of the detection tube member 3 in the vehicle vertical direction (outer diameter D).

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 2c. This detection tube member 3 is disposed in a position facing the front surface 9a (the vehicle front side) of the bumper reinforcement 9 in the bumper 7 of the vehicle. Both ends of the detection tube member 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. As described above, since the longitudinal length L1 of the groove 2c is smaller than the outer diameter D of the detection tube member 3 (L1 <D) on the vehicle width direction center portion side (center portion), the detection tube member 3 is disposed in the groove 2c in a state where it is crushed by a predetermined amount (in this case, about 1 mm) in the longitudinal direction of the vehicle.

The detection tube member 3 has a circular cross-sectional shape and is made of synthetic rubber, for example, silicone rubber. As shown in FIG. 5, the outer diameter D of the tube member 3 for detection is about 8 mm, for example. The inner diameter d of the detection tube member 3 is, for example, about 4 mm. The wall thickness t of the peripheral wall of the detection tube member 3 is, for example, about 2 mm. 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.

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.

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.

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 which is disposed in the bumper cover 8 and extends in the vehicle width direction. As shown in FIGS. 3 and 4, a beam is provided in the center of the interior. Hollow member. The bumper reinforcement 9 has a front surface 9a that is a surface on the front side of the vehicle and a rear surface 9b that is a surface on the rear side of the vehicle. 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.

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.

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.

Next, the operation at the time of collision of the vehicle collision detection apparatus 1 in the present embodiment will be described. When a collision with a pedestrian or the like of the vehicle 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, 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. 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.

In particular, in the present embodiment, as described above, the front-rear length L1 of the groove 2c is smaller than the outer diameter D of the tube member 3 for detection (L1 < D) Therefore, the detection tube member 3 is disposed in the groove 2c in a state where it is crushed by a predetermined amount in the vehicle front-rear direction (see FIGS. 2 and 3). Specifically, while the outer diameter D of the detection tube member 3 of the present embodiment is about 8 mm, the longitudinal length L1 of the groove 2c in the center portion is about 7 mm. That is, the longitudinal length L1 of the groove 2c in the center portion is shorter by about 1 mm than the outer diameter D of the tube member 3 for detection. Therefore, the tube member 3 for detection in the vehicle width direction center part side is mounted | worn with the groove part 2c in the state crushed about 1 mm in the vehicle front-back direction.

Thus, in this embodiment, by attaching the detection tube member 3 to the groove portion 2c in a state where the detection tube member 3 is crushed by a predetermined amount in the front-rear direction, as shown in FIGS. The output of the pressure sensor 4 is increased. That is, the front and rear length L (L2 = 8 [mm]) of the groove 2c is approximately the same as the front and rear length (outer diameter D = 8 [mm]) of the tube member 3 for detection. When the length L (L1 = 7 [mm]) is shorter than the front-rear length (outer diameter D = 8 [mm]) of the detection tube member 3, the output of the pressure sensor 4 becomes larger (FIG. 6). Thus, the output of the pressure sensor 4 at the time of collision when L <D indicated by the solid line in FIG. 7 is compared with the output of the pressure sensor 4 at the time of collision when L ≧ D indicated by the dotted line in FIG. However, the rise of the pressure detection value by the pressure sensor 4 is accelerated.

Here, the “pressure detection range” that can be detected by the pressure sensor 4 will be described. As described above, when the bumper cover 7 is deformed at the time of the collision, the bumper absorber 2 is deformed to the rear side of the vehicle, and at the same time, the detection tube member 3 is deformed so as to be crushed in the vehicle front-rear direction. The deformation of the detection tube member 3 continues until the inner wall surfaces of the detection tube member 3 on the vehicle front side and the rear side come into contact with each other. If the inner wall surfaces of the detection tube member 3 on the vehicle front side and the rear side are in contact (bottomed state), even if the bumper absorber 2 is further deformed, the detection tube member 3 is further deformed in the front-rear direction. Since it becomes difficult, the output of the pressure detected by the pressure sensor 4 is saturated. Thus, the deformation amount of the bumper absorber 2 that can be detected by the deformation of the detection tube member 3 is limited, and this range is referred to as a “pressure detection range”.

This “pressure detection range” varies depending on the front-rear length A of the bumper absorber 2 before the collision and the front-rear length (outer diameter D) of the detection tube member 3. That is, the front and rear length A (thickness) of the bumper absorber 2 is longer (thick) in the vehicle width direction center portion side than the shorter (thin) vehicle width direction end portion side of the bumper absorber 2 in the vehicle width direction. Since it takes time for the detection tube member 3 to reach the bottomed state, the pressure detection range becomes large.

On the other hand, it is known that the “pressure detection range” of the hollow detection tube member 3 alone is calculated by the inner diameter d ÷ the outer diameter D × 100. When the outer dimensions of the detection tube member 3 are an outer diameter D = 8 [mm] and an inner diameter d = 4 [mm], the pressure detection range of the detection tube member 3 alone is 4/8 × 100 = 50%. Become. In the present embodiment, the detection tube member 3 on the center side in the vehicle width direction is mounted in the groove 2c in a state of being crushed by about 1 mm in the front-rear direction. The pressure detection range of the detection tube member 3 alone in this portion is (4-1) / (8-1) × 100≈43%. That is, when the detection tube member 3 is mounted in the groove 2c in a state where the detection tube member 3 is crushed by a predetermined amount in the front-rear direction, the pressure detection range of the detection tube member 3 alone is reduced.

In the present embodiment, the front-rear length L1 of the groove 2c is set to the front-rear length of the detection tube member 3 on the vehicle width direction center portion side (center portion) where the front-rear length A1 (thickness) of the bumper absorber 2 is long (thick). By making it shorter than the outer diameter (outer diameter D), the pressure detection range of the detection tube member 3 alone is reduced. On the other hand, the front-rear length L2 of the groove 2c is set to be approximately the same as the front-rear length of the detection tube member 3 on the vehicle width direction end (corner portion) side where the front-rear length A2 of the bumper absorber 2 is short (thin). Thus, the maximum pressure detection range of the detection tube member 3 is ensured to the maximum extent. Thereby, the variation of the “pressure detection range” by the pressure sensor 4 in the vehicle width direction position is reduced.

Subsequently, 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. Is determined. Furthermore, 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 operation of the pedestrian protection device 10 has occurred.

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 (Expression 1)
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 .

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.

As described above, the vehicle collision detection apparatus 1 according to the first embodiment includes the bumper absorber 2 disposed on the front side of the bumper reinforcement 9 in the bumper 7 of the vehicle, and the bumper absorber 2 on the bumper absorber 2. A tube member for detection 3 in which a hollow portion 3a is formed inside a groove portion 2c formed extending in the width direction, and a pressure sensor 4 for detecting the pressure in the hollow portion 3a of the tube member for detection 3. And a collision of an object (such as a pedestrian) with the bumper 7 is detected based on a pressure detection result by the pressure sensor 4. The detection tube member 3 is mounted in the groove 2c in a state in which at least a part in the vehicle width direction (in this case, the central portion side in the vehicle width direction) is crushed by a predetermined amount in the vehicle front-rear direction. .

According to this configuration, by attaching the detection tube member 3 to the groove portion 2c in a state where at least a part in the vehicle width direction (in this case, the center portion side in the vehicle width direction) is previously crushed by a predetermined amount in the vehicle front-rear direction. The rise of the output of the pressure sensor 4 in at least a part of the detection tube member 3 can be accelerated. Thereby, the collision detection accuracy of the vehicle collision detection apparatus 1 can be improved.

Further, the groove portion 2c has a length L in the vehicle front-rear direction different from the position in the vehicle width direction, and has a length L1 in the vehicle front-rear direction in at least a part in the vehicle width direction (in this case, the center in the vehicle width direction). The detection tube member 3 is shorter than the length (outer diameter D) in the vehicle front-rear direction.

According to this configuration, the length L1 in the vehicle front-rear direction in at least a part of the groove 2c in the vehicle width direction (in this case, the center in the vehicle width direction) is the length in the vehicle front-rear direction of the detection tube member 3 ( By making it shorter than the outer diameter D), the detection tube member 3 attached to this portion can be previously crushed by a predetermined amount in the vehicle longitudinal direction. Thereby, it becomes possible to make the rise of the output of the pressure sensor 4 of the said part quick.

The length A of the bumper absorber 2 in the vehicle front-rear direction differs depending on the position in the vehicle width direction, and the length L of the groove 2c in the vehicle front-rear direction is equal to the length A of the bumper absorber 2 in the vehicle front-rear direction. Is set accordingly. In this case, the groove 2c is formed such that the length L of the groove 2c in the vehicle front-rear direction becomes shorter as the vehicle width direction position of the bumper absorber 2 in the vehicle front-rear direction becomes longer. Specifically, the length L1 in the vehicle front-rear direction of the groove 2c on the vehicle width direction center side is shorter than the length (outer diameter D) of the detection tube member 3 in the vehicle front-rear direction. And

According to this configuration, the output of the pressure sensor 4 over the entire vehicle width direction is set by appropriately setting the length L of the groove portion 2c in the vehicle front-rear direction according to the length A of the bumper absorber 2 in the vehicle front-rear direction. Can be sufficiently generated. That is, in the vehicle width direction position where the longitudinal length A (thickness) of the bumper absorber 2 is long (thick), the longitudinal length L1 of the groove 2c is shorter than the longitudinal length (outer diameter D) of the detection tube member 3. By doing so, the output of the pressure sensor 4 at the time of a collision can be enlarged. Thereby, it is possible to reduce the variation in the pressure detection range by the pressure sensor 4 at the vehicle width direction position.

Further, the groove 2 c is formed on the rear surface 2 b of the bumper absorber 2, and the rear surface 2 b of the bumper absorber 2 is in contact with the front surface 9 a of the bumper reinforcement 9. According to this configuration, the rear surface 2b of the bumper absorber 2 and the front surface 9a of the bumper reinforcement 9 are in contact with each other. It can be reliably received by the force 9. 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 2c, and the detection tube member 3 can be stably disposed in the groove 2c.
(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. 8 to 10, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only different parts will be described. In the second embodiment, as shown in FIGS. 8 to 10, the groove portion 2 c in which the detection tube member 3 is mounted is disposed on the center side in the vehicle longitudinal direction inside the bumper absorber 2. Different from the first embodiment.

The length L of the groove 2c in the vehicle front-rear direction is set according to the length A ′ in the vehicle front-rear direction from the front surface 2a of the bumper absorber 2 to the inner wall surface of the groove 2c on the vehicle rear side (see FIG. 8). That is, the longitudinal length L of the groove 2c is shortened as the longitudinal width A ′ of the bumper absorber 2 is longer.

Specifically, the length A ′ of the bumper absorber 2 in the front-rear direction is equal to the length A′1 of the bumper absorber 2 at the center in the vehicle width direction (center portion) shown in FIG. It is longer (thicker) than the front / rear length A′2 of the bumper absorber 2 on the side in the width direction (corner portion). For this reason, the front-rear length L1 of the groove 2c on the vehicle width direction center portion side (center portion) is a predetermined length (in this case, about 1 mm) than the length (outer diameter D) of the detection tube member 3 in the vehicle front-rear direction. ) Is set shorter. Further, the longitudinal length L2 of the groove 2c on the vehicle width direction end (corner portion) side is set to be approximately the same as the length (outer diameter D) of the detection tube member 3 in the longitudinal direction of the vehicle. . The outer diameter D is the front-rear length of the detection tube member 3 in a state before being attached to the groove 2c.

As in the first embodiment, the outer diameter D of the detection tube member 3 is about 8 mm. Moreover, the front-rear length L1 of the groove 2c in the center portion is about 7 mm. Moreover, the front-rear length L2 of the groove 2c in a corner portion other than the center portion is about 7 mm. Therefore, the tube member 3 for detection in the vehicle width direction center part side is mounted | worn with the groove part 2c in the state crushed about 1 mm in the vehicle front-back direction.

In addition, about the method of forming the groove part 2c from which the front-and-rear length L differs in the inside of the bumper absorber 2, it shall be performed by adhering and fixing two bumper absorbers divided | segmented before and after, for example. In this case, after forming the groove 2c having different front and rear lengths L on the rear surface of one bumper absorber and mounting the detection tube member 3, the front surface of the other bumper absorber is bonded to the rear surface. A bumper absorber 2 is formed. Moreover, you may form the bumper absorber 2 of this embodiment by providing the through-hole from which front-back length differs in one bumper absorber.

In the second embodiment, the same effect as that of the first embodiment can be obtained. In other words, the detection tube member 3 is mounted in the groove 2c in a state where at least a part in the vehicle width direction (in this case, the central portion side in the vehicle width direction) is previously crushed by a predetermined amount in the vehicle front-rear direction. The rise of the output of the pressure sensor 4 on the center side of the tube member 3 in the vehicle width direction can be accelerated. Thereby, the collision detection accuracy of the vehicle collision detection apparatus 1 can be improved.

Further, the vehicle longitudinal direction length L1 on the vehicle width direction center side of the groove portion 2c is made shorter than the vehicle longitudinal direction length (outer diameter D) of the detection tube member 3 so that the vehicle width direction center portion is obtained. The detection tube member 3 mounted on the side can be previously crushed by a predetermined amount in the vehicle front-rear direction.

Further, by appropriately setting the length L in the vehicle front-rear direction of the groove portion 2c from the front surface 2a of the bumper absorber 2 to the inner wall surface of the groove portion 2c on the vehicle rear side in the vehicle front-rear direction, The output of the pressure sensor 4 can be sufficiently generated over the entire width direction. That is, in the vehicle width direction position where the length A ′ in the front-rear direction of the bumper absorber 2 is long (thick), the front-rear length L1 of the groove 2c is made shorter than the front-rear length (outer diameter D) of the detection tube member 3. As a result, the output of the pressure sensor 4 at the time of collision is increased.
(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. In FIG. 11 to FIG. 13, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described. In the third embodiment, as shown in FIGS. 11 to 13, a pressing member 12 for pressing the detection tube member 3 from the vehicle rear side to the vehicle front side on the vehicle front side of the bumper reinforcement 9. Is provided.

Further, the third embodiment is different from the first embodiment in that the length L of the groove 2c in the vehicle front-rear direction is the same over the entire vehicle width direction. That is, the longitudinal length L1 of the groove portion 2c on the vehicle width direction center portion side (center portion) shown in FIG. 12 and the longitudinal length L2 of the groove portion 2c on the vehicle width direction end portion side (corner portion) shown in FIG. Are the same length. In this case, the lengths L1 and L2 of the groove 2c in the vehicle front-rear direction are set to the same length as the length (outer diameter D) of the detection tube member 3 in the vehicle front-rear direction.

The pressing member 12 is a rectangular plate-like member, and includes a front surface 12a that is a vehicle front side surface and a rear surface 12b that is a vehicle rear side surface. The pressing member 12 is disposed across the entire vehicle width direction between the rear surface 2 b of the bumper absorber 2 and the front surface 9 a of the bumper reinforcement 9.

The pressing member 12 is made of a material harder than the bumper absorber 2, for example, a foamed resin having a lower expansion ratio than the bumper absorber 2. The pressing member 12 is disposed on the rear surface 2 b of the bumper absorber 2 after the detection tube member 3 is mounted in the groove 2 c of the bumper absorber 2. The bumper absorber 2 and the pressing member 12 are bonded and fixed, for example. Further, the pressing member 12 and the bumper reinforcement 9 are fitted and fixed by fitting portions (not shown) provided respectively. In addition, as a material of the pressing member 12, other synthetic resins such as polyethylene (PE) and polypropylene (PP) may be used.

The protrusion part 12c is provided in the vehicle width direction center part side (center part) in the front surface 12a of the press member 12. As shown in FIG. The protruding portion 12c protrudes from the front surface 12a of the pressing member 12 to the vehicle front side. Specifically, the protruding portion 12c protrudes by x mm toward the front side of the vehicle (see FIG. 12). The protrusion 12c has a rectangular cross-sectional shape as viewed from the side of the vehicle, and is disposed along the vehicle width direction at a position facing the groove 2c (detection tube member 3). In addition, the cross-sectional shape of the protrusion part 12c is not restricted to a rectangle, For example, a semicircle etc. may be sufficient.

Here, since the detection tube member 3 is a hollow tube-shaped member made of a synthetic rubber having flexibility and having a hollow portion 3a formed therein, the tube member 3 is pressed toward the front side of the vehicle by the protruding portion 12c of the pressing member 12. If it is done, it will deform in the vehicle longitudinal direction. As a result, at least a portion of the detection tube member 3 in the vehicle width direction (in this case, the center portion side in the vehicle width direction) is crushed by a predetermined amount in the vehicle front-rear direction in the groove 2c. Specifically, in the example shown in FIG. 12, L1 = 8 [mm], x = 1 [mm], and L′ 1 = L1-x = 8-1 = 7 [mm]. Further, the outer diameter D of the detection tube member 3 is about 8 mm. Therefore, the tube member 3 for detection in the vehicle width direction center part side is mounted | worn with the groove part 2c in the state collapsed about 1 mm in the vehicle front-back direction.

On the other hand, no protrusion 12c is provided on the front surface 12a of the pressing member 12 on the vehicle width direction end (corner portion) side shown in FIG. The longitudinal length L2 of the groove 2c is set to be approximately the same as the length (outer diameter D) of the detection tube member 3 in the longitudinal direction of the vehicle. For this reason, the tube member 3 for detection in the vehicle width direction edge part side is mounted | worn with the groove part 2c in the state which is not crushed in the vehicle front-back direction.

That is, in the third embodiment, the pressing member 12 provided with the protruding portion 12c only on the center side in the vehicle width direction is disposed between the rear surface 2b of the bumper absorber 2 and the front surface 9a of the bumper reinforcement 9. By doing so, the center part side in the vehicle width direction of the tube member 3 for detection is attached to the groove part 2c in a state where it is crushed by a predetermined amount in the vehicle longitudinal direction.

Note that, as in the first embodiment, the length A (thickness) of the bumper absorber 2 in the vehicle front-rear direction differs depending on the position in the vehicle width direction (see FIG. 11). Specifically, the front-rear length A1 of the bumper absorber 2 at the vehicle width direction center portion side (center portion) shown in FIG. 12 corresponds to the front and rear lengths of the bumper absorber 2 at the vehicle width direction end portion side (corner portion) shown in FIG. It is longer (thicker) than the length A2.

In the vehicle collision detection device 1 according to the third embodiment described above, the detection tube member 3 is pressed to the vehicle rear side of the detection tube member 3 in the groove 2c to be crushed by a predetermined amount in the vehicle front-rear direction. A pressing member 12 is provided for setting the state.

Also in the third embodiment, the same effect as that of the first embodiment can be obtained. That is, on the vehicle rear side of the detection tube member 3 in the groove portion 2c, a pressing member 12 (protruding portion 12c) for pressing the detection tube member 3 so as to be crushed by a predetermined amount in the vehicle front-rear direction. Since it is provided, at least a part of the detection tube member 3 in the vehicle width direction (the center in the vehicle width direction) can be mounted in the groove 2c in a state in which the tube member 3 is previously crushed by a predetermined amount in the vehicle longitudinal direction. Thereby, the rise of the output of the pressure sensor 4 on the center side in the vehicle width direction can be accelerated, and the collision detection accuracy of the vehicle collision detection apparatus 1 can be improved.

In particular, it is not necessary to change the length L in the vehicle longitudinal direction of the groove 2c in the vehicle width direction position, and by providing the pressing member 12 on the vehicle rear side of the detection tube member 3 in the groove 2c, the configuration can be simplified. The detection tube member 3 mounted in the groove 2c can be crushed by a predetermined amount in the vehicle front-rear direction.

Further, the pressing member 12 is characterized by being made of a material harder than the bumper absorber 2. According to this configuration, since the pressing member 12 is made of a material harder than the bumper absorber 2, the detection tube member 3 is placed in the vehicle longitudinal direction by pressing the hollow detection tube member 3 with the pressing member 12. Only a fixed amount can be reliably crushed.

The groove 2c is formed on the rear surface 2b of the bumper absorber 2, and the pressing member 12 is disposed between the rear surface 2b of the bumper absorber 2 and the front surface 9a of the bumper reinforcement 9.

According to this configuration, by disposing the pressing member 12 so as to be sandwiched between the rear surface 2b of the bumper absorber 2 and the front surface 9a of the bumper reinforcement 9, the pressing member 12 can be stably disposed. . Furthermore, the presence of the pressing member 12 provided on the vehicle rear side of the groove 2c can surely prevent the detection tube member 3 from falling out of the groove 2c.

The pressing member 12 has a protruding portion 12c that is provided at a position facing the groove portion 2c and protrudes toward the vehicle front side, and presses the detection tube member 3 toward the vehicle front side by the protruding portion 12c. .

According to this configuration, the tube member for detection 3 mounted in the groove portion 2c is moved forward and backward by pressing the tube member for detection 3 toward the vehicle front side by the protruding portion 12c provided at a position facing the groove portion 2c. It is possible to reliably deform in the direction, and it is possible to surely speed up the rise of the output of the pressure sensor 4 at the center in the vehicle width direction.

Further, the pressing member 12 is characterized in that it is disposed on the rear surface 2b of the bumper absorber 2 over the entire vehicle width direction. According to this configuration, the pressing member 12 is disposed on the rear surface 2b of the bumper absorber 2 over the entire vehicle width direction, so that the entire vehicle width direction is interposed between the pressing member 12 and the bumper reinforcement 9. So that there is no gap. 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.

Further, the protruding portion 12c is provided on at least a part of the pressing member 12 in the vehicle width direction (in this case, the central portion side in the vehicle width direction). According to this configuration, the tube member for detection 3 is pressed by the protruding portion 12c of the pressing member 12, so that at least a part in the vehicle width direction (center side in the vehicle width direction) is mounted in the groove 2c. The length L ′ of the detection tube member 3 in the vehicle front-rear direction can be made shorter than the outer diameter D of the detection tube member 3. Thereby, the rise of the output of the pressure sensor 4 in the vehicle width direction center part side can be accelerated.
(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. In FIG. 14, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described. In the fourth embodiment, a pressing member 121 for pressing the detection tube member 3 from the vehicle rear side toward the vehicle front side is provided in the groove portion 2c on the vehicle width direction center portion side (center portion) shown in FIG. Is provided.

The pressing member 121 is a rectangular plate-like member and extends along the vehicle width direction. The pressing member 121 is made of a material harder than the bumper absorber 2, for example, a foamed resin having a lower expansion ratio than the bumper absorber 2. The length of the pressing member 121 in the vehicle vertical direction is set to be smaller than the vertical length of the opening surface 2d of the groove 2c. For this reason, after mounting the detection tube member 3 in the groove 2c of the bumper absorber 2, the pressing member 121 is pushed into the front of the vehicle (the back of the groove 2c) from the opening surface 2d of the groove 2c, whereby the pressing member is inserted into the groove 2c. 121 can be arranged. The length x of the pressing member 121 in the vehicle front-rear direction is about 1 mm.

When the pressing member 121 is pushed into the groove 2c, the detection tube member 3 on the center side in the vehicle width direction is crushed by about 1 mm in the front-rear direction within the groove 2c. In the example shown in FIG. 14, L1 = 8 [mm], x = 1 [mm], and L′ 1 = L1-x = 8-1 = 7 [mm].

On the other hand, although not shown, the pressing member 121 is not provided in the groove 2c on the vehicle width direction end (corner portion) side. The longitudinal length L2 of the groove 2c is set to be approximately the same as the length (outer diameter D) of the detection tube member 3 in the longitudinal direction of the vehicle. For this reason, the tube member 3 for detection in the vehicle width direction edge part side is mounted | worn with the groove part 2c in the state which is not crushed in the vehicle front-back direction.

That is, in the fourth embodiment, by disposing the pressing member 121 only in the groove portion 2c on the vehicle width direction center portion side, the vehicle width direction center portion side of the detection tube member 3 is in the vehicle front-rear direction. It is made to mount | wear with the groove part 2c in the state crushed by the length of 121 front and back.

Although not shown in the drawing, as in the first embodiment, the front-rear length A1 of the bumper absorber 2 at the vehicle width direction center portion side (center portion) is equal to the bumper absorber 2 at the vehicle width direction end portion side (corner portion). It is longer (thicker) than the longitudinal length A2.

In the vehicle collision detection apparatus 1 according to the fourth embodiment described above, the detection tube member 3 is pressed to the vehicle rear side of the detection tube member 3 in the groove 2c to be crushed by a predetermined amount in the vehicle front-rear direction. It is characterized by having a pressing member 121 for setting the state.

Also in the fourth embodiment, the same effect as in the first embodiment can be obtained. That is, a pressing member 121 is provided on the vehicle rear side of the detection tube member 3 in the groove 2c so as to press the detection tube member 3 so as to be crushed by a predetermined amount in the vehicle front-rear direction. In addition, at least a part of the detection tube member 3 in the vehicle width direction (the center portion side in the vehicle width direction) can be mounted in the groove 2c in a state where it is previously crushed by a predetermined amount in the vehicle longitudinal direction. Thereby, the rise of the output of the pressure sensor 4 on the center side in the vehicle width direction can be accelerated, and the collision detection accuracy of the vehicle collision detection apparatus 1 can be improved.

Similarly to the third embodiment, there is no need to change the length L of the groove 2c in the vehicle front-rear direction at the position in the vehicle width direction, and the pressing member 121 is placed on the vehicle rear side of the detection tube member 3 in the groove 2c. By providing this, the detection tube member 3 mounted in the groove 2c can be crushed by a predetermined amount in the vehicle front-rear direction with a simple configuration. Furthermore, the location where the detection tube member 3 is crushed by a predetermined amount in the vehicle front-rear direction can be easily changed by simply shifting the position of the pressing member 121 in the vehicle width direction. Moreover, the amount of crushing in the front-rear direction of the detection tube member 3 can be easily adjusted by appropriately changing the front-rear length (thickness) of the pressing member 121.

The position where the pressing member 121 is arranged is not limited to the vehicle rear side of the detection tube member 3 in the groove 2c. For example, as shown in FIG. 15, a pressing member 121 may be disposed on the vehicle front side of the detection tube member 3 in the groove 2 c. In this case, the same effect as that of the fourth embodiment can be obtained.

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. A modification of the above embodiment will be described below. 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.

In the first embodiment, the length L of the groove 2c in the vehicle front-rear direction is shorter than the length (outer diameter D) of the detection tube member 3 in the vehicle front-rear direction at the center in the vehicle width direction. However, it is not limited to this. The front-rear length L of the groove 2c only needs to be formed such that the front-rear length A of the bumper absorber 2 is shorter as the vehicle width direction position is longer. For example, the front-rear length L of the groove 2c may be shorter than the front-rear length (outer diameter D) of the detection tube member 3 at the vehicle width direction position where the front-rear length A of the bumper absorber 2 is 40 mm or more. . When the longitudinal length A2 of the bumper absorber 2 on the vehicle width direction end side is thick, the longitudinal length L2 of the groove 2c on the vehicle width direction end side is set to the longitudinal length of the detection tube member 3. What is necessary is just to make it shorter than (outer diameter D). Further, depending on the longitudinal length A of the bumper absorber 2, the longitudinal length L of the groove 2c may be set in increments of several mm in the vehicle width direction.

Moreover, although the said embodiment demonstrated the case where the length A of the vehicle front-back direction of the bumper absorber 2 differs in a vehicle width direction, it is not restricted to this. For example, the present disclosure can be applied when the length A (thickness) of the bumper absorber 2 in the vehicle front-rear direction is uniform over the entire vehicle width direction. In this case, the length L in the vehicle front-rear direction of the groove 2c on the vehicle width direction end side (corner portion) may be shorter than the outer diameter D of the detection tube member 3. As a result, it is possible to sufficiently generate the output of the pressure sensor 4 at a corner portion where the external force is unlikely to be transmitted to the detection tube member 3 due to the impact (external force) accompanying the collision escaping to the side of the vehicle. .

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. Not limited to. 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.

Although the present disclosure has been described based on 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

A bumper absorber (2) disposed on the front side of the bumper reinforcement (9) in the bumper (7) of the vehicle, and a groove (2c) formed in the bumper absorber (2) extending in the vehicle width direction. ) And a pressure sensor (4) for detecting the pressure in the hollow portion (3a) of the detection tube member (3). The detection tube member (3) has a hollow portion (3a) formed therein. 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),
The vehicle collision detection device, wherein the detection tube member (3) is attached to the groove (2c) in a state in which at least a part in the vehicle width direction is crushed by a predetermined amount in the vehicle longitudinal direction.
The length (L, L1, L2) of the groove portion (2c) in the vehicle front-rear direction differs in the vehicle width direction position, and the length (L1) in the vehicle front-rear direction in at least a part of the vehicle width direction is detected. The vehicle collision detection device according to claim 1, wherein the tube member (3) is shorter than a length (D) in the vehicle front-rear direction.
The length (A, A1, A2, A ′, A′1, A′2) of the bumper absorber (2) in the vehicle front-rear direction differs depending on the position in the vehicle width direction.
The vehicle collision detection according to claim 1 or 2, wherein the length of the groove (2c) in the vehicle front-rear direction is set according to the length of the bumper absorber (2) in the vehicle front-rear direction. apparatus.
The groove portion (2c) is formed such that the length in the vehicle front-rear direction of the groove portion (2c) is shorter as the vehicle width direction position of the bumper absorber (2) is longer in the vehicle front-rear direction. The collision detection apparatus for vehicles according to claim 3 characterized by things.
The length of the groove portion (2c) in the vehicle front-rear direction is the vehicle front-rear direction length from the front surface (2a) of the bumper absorber (2) to the inner wall surface or the opening surface (2d) on the vehicle rear side in the groove portion (2c). The longer the length (A, A1, A2, A ′, A′1, A′2) in the vehicle width direction, the shorter the length (L) of the groove (2c) in the vehicle front-rear direction is. The vehicle collision detection device according to claim 1, wherein the vehicle collision detection device is provided.
The length of the groove (2c) in the vehicle front-rear direction is shorter than the length of the detection tube member (3) in the vehicle front-rear direction at the center in the vehicle width direction. To 5. The vehicle collision detection device according to claim 1.
The groove (2c) is formed on the rear surface (2b) of the bumper absorber (2),
The said rear surface (2b) of the said bumper absorber (2) is contact | abutting to the front surface (9a) of the said bumper reinforcement (9), It is any one of Claim 1 to 6 characterized by the above-mentioned. Vehicle collision detection device.
The detection tube member (3) is pressed into at least one of the vehicle front side and the rear side of the detection tube member (3) in the groove (2c) and is crushed by a predetermined amount in the vehicle front-rear direction. The vehicle collision detection device according to any one of claims 1 to 7, further comprising a pressing member (12, 121) for setting the state.
The vehicle collision detection device according to claim 8, wherein the pressing member (12, 121) is made of a material harder than the bumper absorber (2).
The groove (2c) is formed on the rear surface (2b) of the bumper absorber (2),
9. The pressing member (12) is disposed between the rear surface (2b) of the bumper absorber (2) and a front surface (9a) of the bumper reinforcement (9). Or the vehicle collision detection device according to 9.
The pressing member (12) has a protruding portion (12c) provided at a position facing the groove (2c) and protruding forward of the vehicle, and the detecting tube member (3) is formed by the protruding portion (12c). The vehicle collision detection device according to claim 10, wherein the vehicle is pressed toward the vehicle front side.
The vehicle collision detection device according to claim 10 or 11, wherein the pressing member (12) is disposed on the rear surface (2b) of the bumper absorber (2) over the entire vehicle width direction. .
The vehicle collision detection device according to claim 11 or 12, wherein the protrusion (12c) is provided on at least a part of the pressing member (12) in the vehicle width direction.