WO2016038840A1 - Collision detection device for vehicle - Google Patents

Abstract

A collision detection device (1) for a vehicle has: a bumper absorber (2) disposed between a bumper cover (8) and a bumper reinforcement (9) for the vehicle; a tube member (3) for detection, the tube member (3) being mounted in a groove (21a, 211a-213a, 227b) formed in the bumper absorber so as to extend in the width direction of the vehicle; and a pressure sensor (4) for detecting pressure within a hollow section (3a) formed inside the tube member for detection. The tube member for detection is mounted in the groove formed in the rear surface (21b, 211b-213b) of a front absorber (21, 211-213) and/or the front surface (22a, 221a-227a) of a rear absorber (22, 221-227), the rear surface (21b, 211b-213b) and the front surface (22a, 221a-227a) facing each other. When measured in the front-rear direction of the vehicle, the thickness (L) of the portion of the front absorber, which is located in front, relative to the vehicle, of the tube member for detection mounted in the groove, is uniform along the entire length of the front absorber in the width direction of the vehicle.

Description

Vehicle collision detection device Cross-reference of related applications

This application is based on Japanese Application No. 2014-183349 filed on September 9, 2014, the contents of which are incorporated herein by reference.

The present disclosure relates to a vehicle collision detection device that can accurately detect the occurrence of a vehicle collision accident.

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 hollow portion is disposed in front of a bumper reinforcement in a bumper of the vehicle, and the pressure in the hollow portion of the chamber member is detected by a pressure sensor. There is something like that. 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. A pedestrian's collision is detected by detecting this pressure change with a pressure sensor.

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. The vehicle collision detection device includes a bumper absorber disposed in a bumper cover 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 detecting. When a pedestrian or the like collides in front of the vehicle, the bumper absorber is deformed while absorbing the impact, and at the same time, the tube member is also deformed. At this time, the pressure in the tube member rises rapidly, and the collision between the vehicle and the pedestrian is detected based on detecting this pressure change by the pressure sensor.

However, in the vehicular collision detection apparatus having the above-described configuration, the length (thickness) of the bumper absorber in the vehicle front-rear direction varies depending on the position in the vehicle width direction. The amount may vary depending on the collision position with an object such as a pedestrian. In this case, the amount of deformation of the tube member at the time of the collision between the vehicle and the pedestrian, that is, the pressure detection result by the pressure sensor varies depending on the collision position (position in the vehicle width direction) of the bumper. There is a problem that accuracy decreases.

The present disclosure has been made in view of the above-described problems, and an object thereof is to provide a vehicle collision detection device capable of performing collision detection with high accuracy regardless of the collision position of the bumper in the vehicle width direction. To do.

In order to solve the above-described object, a vehicle collision detection device according to one aspect of the present disclosure includes a bumper absorber disposed between a bumper cover and a bumper reinforcement of the vehicle, and the bumper absorber in the vehicle width direction. And a pressure sensor for detecting the pressure in the hollow portion formed inside the detection tube member, and a bumper based on the pressure detection result by the pressure sensor. Detects the collision of an object with the cover. The bumper absorber includes a front absorber and a rear absorber divided in the vehicle longitudinal direction, and a detection tube member in a groove formed on at least one of the rear surface of the front absorber and the front surface of the rear absorber facing each other. Is installed. The front absorber is characterized in that the thickness in the vehicle front-rear direction on the vehicle front side of the detection tube member mounted in the groove is uniform throughout the vehicle width direction.

According to this configuration, the thickness of the front absorber in the vehicle front-rear direction on the front side of the vehicle relative to the detection tube member mounted in the groove is uniform over the entire vehicle width direction, so that a collision between the vehicle and the pedestrian occurs. It is possible to prevent the deformation amount of the tube member for detection in, that is, the pressure detection result by the pressure sensor, from fluctuating due to the collision position (position in the vehicle width direction) of the bumper. Thereby, the collision detection accuracy of the vehicle collision detection device 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 III-III cross-sectional view of the bumper portion of FIG. 2. FIG. 4 is a IV-IV cross-sectional view of the bumper portion of FIG. 2. It is sectional drawing which shows the internal structure of the pressure sensor of 1st Embodiment. FIG. 4 is a diagram corresponding to FIG. 3 of the second embodiment. FIG. 10 is a view corresponding to FIG. 3 of the third embodiment. FIG. 10 is a diagram corresponding to FIG. 3 of the fourth embodiment. FIG. 10 is a diagram corresponding to FIG. 3 of the fifth embodiment. FIG. 10 is a diagram corresponding to FIG. 3 of a sixth embodiment. It is FIG. 2 equivalent figure of 7th 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. It is FIG. 3 equivalent view of 8th Embodiment.

(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 to 5, the vehicle collision detection apparatus 1 of the present embodiment includes a bumper absorber 2 that is a shock absorbing member, a hollow detection tube member 3, a pressure sensor 4, a filling member 5, and a collision detection. An ECU 6 is provided. 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 FIGS. 3 and 4, the bumper 7 includes a bumper cover 8, a bumper absorber 2, and a bumper reinforcement 9 as main components.

The bumper absorber 2 is a member having an impact absorbing function in the bumper 7 and is disposed between the bumper cover 8 and the bumper reinforcement 9. The bumper absorber 2 includes a front absorber 21 and a rear absorber 22 that are divided in the vehicle longitudinal direction. The front absorber 21 and the rear absorber 22 are made of foamed resin, such as foamed polypropylene.

Specifically, the foamed resin forming the rear absorber 22 has a lower expansion ratio than the foamed resin forming the front absorber 21. For this reason, the rear absorber 22 is harder than the front absorber 21 and the tube member for detection.

The front absorber 21 is provided on the front side of the vehicle with respect to the rear absorber 22, and the rear surface 21b of the front absorber 21 and the front surface 22a of the rear absorber 22 face each other in contact with each other in the entire vehicle width direction. Has been.

As shown in FIGS. 2 to 4, a groove 21a for mounting the detection tube member 3 is formed in the rear surface 21b of the front absorber 21 along the vehicle width direction. Specifically, the groove 21a is formed such that the distance from the front surface of the front absorber 21 to the vehicle front side wall surface of the groove 21a is a constant distance L over the entire vehicle width direction. Moreover, the groove part 21a has a rectangular cross section, and the length in the vehicle front-rear direction and the vehicle vertical direction is equal to or longer than the length of the detection tube member 3 in the vehicle front-rear direction and the vehicle vertical direction. In addition, the groove part 21a shall have a bending part in the middle of the vehicle width direction. Moreover, the cross-sectional shape of the groove part 21a is not restricted to a rectangle, For example, circular and a polygon may be sufficient.

As shown in FIGS. 2 to 4, the front absorber 21 has a uniform thickness L in the vehicle front-rear direction on the front side of the vehicle relative to the detection tube member 3 mounted in the groove 21a over the entire vehicle width direction. Yes. Further, the separation distance X between the rear surface 21b of the front absorber 21 and the front surface 9a of the bumper reinforcement 9 varies depending on the position in the vehicle width direction. Specifically, the thickness of the rear absorber 22 in the vehicle front-rear direction is set based on the separation distance X at the vehicle width direction position. That is, the rear absorber 22 has a function of filling the gap between the rear surface 21b of the front absorber 21 and the front surface 9a of the bumper reinforcement 9 by changing the thickness in the vehicle front-rear direction depending on the position in the vehicle width direction. Fulfill.

In the present embodiment, the bumper cover 8 and the bumper reinforcement 9 have different outer shapes (such as curvature of the curved portion). For this reason, the separation distance X1 (see FIG. 3) on the vehicle width direction center portion side is larger than the separation distance X2 (see FIG. 4) on the vehicle width direction end portion side. Therefore, the outer shape of the front surface 22a of the rear absorber 22 is matched with the outer shape of the bumper cover 8 over the entire vehicle width direction, and the outer shape of the rear surface of the rear absorber 22 is adjusted over the entire width direction of the bumper reinforcement 9. Aligned with the outer shape.

That is, the rear absorber 22 has a length (thickness) in the vehicle front-rear direction that is larger on the vehicle width direction center portion side, and a length in the vehicle front-rear direction on the vehicle width direction end portion side. In this way, the thickness L in the vehicle front-rear direction of the front absorber 21 on the vehicle front side relative to the detection tube member 3 is made uniform over the entire vehicle width direction.

The detection tube member 3 is a member having a hollow portion 3a formed therein and extending in the vehicle width direction (vehicle left-right direction), and is attached to the groove portion 21a of the bumper absorber 2. 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 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.

The detection tube member 3 has a circular cross-sectional shape and is made of synthetic rubber, for example, silicone rubber. The outer diameter of the detection tube member 3 is assumed to be about 10 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.

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 rear surface 9b of the left and right ends of the bumper reinforcement 9, and are fixedly attached by fastening bolts (not shown). In this embodiment, redundancy and detection accuracy are ensured by installing two pressure sensors 4 in this way.

As shown in FIGS. 2 and 5, the pressure sensor 4 is connected to the left and right ends of the detection tube member 3 and configured to detect the pressure in the hollow portion 3 a 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.

As shown in FIG. 5, the pressure sensor 4 includes a main body portion 40, a sensor portion 41, a pressure introduction pipe 42, and a connector portion 43. The main body 40 is a box-shaped case for housing the sensor unit 41. The sensor unit 41 is made of a substrate provided with a sensor element for pressure detection. The pressure introduction tube 42 is a substantially cylindrical tube for introducing the pressure in the detection tube member 3 into the sensor unit 41, and is inserted into the hollow portion 3 a of the detection tube member 3 from the main body unit 40. . The sensor unit 41 detects a pressure change in the hollow portion 3 a of the detection tube member 3 through the pressure introduction tube 42. The sensor unit 41 is electrically connected to a connector 44 provided in the connector unit 43, and transmits a signal proportional to the pressure to the collision detection ECU 6 via the connector 44 and the signal line (see FIG. 1).

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 the pressure sensor 4 and the pedestrian protection apparatus 10 (FIG. 1). reference). A pressure signal (pressure data) from the pressure sensor 4 is input to the collision detection ECU 6. 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 detects a collision of an object such as a pedestrian to the bumper 7, the pedestrian protection device 10. Is activated.

The bumper 7 is for reducing a shock 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. A hollow member having a sun-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. In the present embodiment, as described above, the outer shape of the bumper reinforcement 9 (such as the curvature of the curved portion) is different from the outer shape of the bumper cover 8.

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. Direct transmission from the bumper cover 8 or the like to the pressure sensor 4 is protected by the presence of the bumper reinforcement 9.

For example, a pop-up hood is used as the pedestrian protection device 10. This pop-up hood raises the rear end of the engine hood instantly after detecting a vehicle collision, 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 that cushions a pedestrian's impact by deploying an 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 an object such as a pedestrian collides with the front of the vehicle, the bumper cover 8 of the bumper 7 is deformed by an impact caused by the collision with the pedestrian. Subsequently, at the same time as the front absorber 21 is deformed while absorbing an impact, the detection tube member 3 is also deformed. At this time, the pressure in the detection tube member 3 rapidly increases, and this pressure change is transmitted to the pressure sensor 4.

In the present embodiment, the rear absorber 22 provided on the vehicle rear side of the front absorber 21 is made of a material having higher hardness than the front absorber 21 and the detection tube member 3. For this reason, after the front absorber 21 and the detection tube member 3 are deformed, the rear absorber 22 is deformed. That is, the rear absorber 22 is not deformed before the front absorber 21 and the detection tube member 3, and the detection tube member 3 can be appropriately deformed along with the deformation of the front absorber 21. ing.

Furthermore, in the present embodiment, the length L in the vehicle front-rear direction of the front absorber 21 on the vehicle front side relative to the detection tube member 3 mounted in the groove 21a is made uniform over the entire vehicle width direction. . For this reason, it is possible to prevent the deformation amount of the detection tube member 3 at the time of the collision between the vehicle and the pedestrian, that is, the pressure detection result by the pressure sensor 4 from being varied depending on the collision position (position in the vehicle width direction). Thereby, the collision detection accuracy of the vehicle collision detection apparatus 1 can be improved.

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, specifically, 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, the collision with the pedestrian Is determined to have occurred. 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 value 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. 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 between the bumper cover 8 and the bumper reinforcement 9 of the vehicle, and the vehicle width at the bumper absorber 2. A detection tube member 3 mounted in a groove portion 21a formed along the direction, and a pressure sensor 4 for detecting the pressure in the hollow portion 3a formed in the detection tube member 3; The collision of the object with the bumper cover 8 is detected based on the pressure detection result by 4. The bumper absorber 2 includes a front absorber 21 and a rear absorber 22 that are divided in the vehicle front-rear direction, and a detection tube member is mounted in a groove portion 21a formed on the rear surface 21b of the front absorber 21 that faces each other. Is done. The front absorber 21 is characterized in that the thickness L in the vehicle front-rear direction on the vehicle front side of the detection tube member 3 mounted in the groove 21a is uniform over the entire vehicle width direction.

According to this configuration, the vehicle and the pedestrian are made uniform by making the thickness L in the vehicle front-rear direction of the front absorber 21 on the vehicle front side relative to the detection tube member 3 mounted in the groove 21a uniform over the entire vehicle width direction. It is possible to prevent the amount of deformation of the detection tube member 3 at the time of a collision with the vehicle, i.e., the pressure detection result by the pressure sensor 4 from being varied due to the collision position (position in the vehicle width direction) of the bumper 7 in the vehicle width direction. Thereby, the collision detection accuracy of the vehicle collision detection apparatus 1 can be improved.

Further, the separation distance X between the rear surface 21b of the front absorber 21 and the front surface 9a of the bumper reinforcement 9 varies depending on the position in the vehicle width direction. The thickness of the rear absorber 22 in the vehicle front-rear direction is set based on the separation distance X at the vehicle width direction position, and is different depending on the vehicle width direction position.

According to this configuration, by setting the thickness of the rear absorber 22 in the vehicle front-rear direction according to the separation distance X in the vehicle width direction position between the rear surface 21b of the front absorber 21 and the front surface 9a of the bumper reinforcement 9. Further, the thickness L in the vehicle front-rear direction on the vehicle front side of the front absorber 21 relative to the detection tube member 3 can be made uniform over the entire vehicle width direction.

Also, the groove 21a is formed on the rear surface 21b of the front absorber 21. And the tube member 3 for a detection is mounted | worn with the groove part 21a formed in the rear surface 21b of the front part absorber 21, It is characterized by the above-mentioned.

According to this configuration, the tube member for detection 3 can be stably disposed between the rear surface 21b of the front absorber 21 and the front surface 22a of the rear absorber 22 facing the front absorber 21. Further, since the groove 21 a is disposed on the rear surface 21 b of the front absorber 21, the detection tube member 3 can be easily assembled to the bumper absorber 2.

The rear absorber 22 is provided so as to face the entire vehicle width direction of the front absorber 21. According to this configuration, since the rear absorber 22 is provided so as to face the entire vehicle width direction of the front absorber 21, it is possible to prevent foreign matters, small animals, and the like from entering the groove portion 21a throughout the vehicle width direction. It is possible to prevent the detection tube member 3 from being damaged by foreign matters, small animals, or the like in the entire vehicle width direction. Furthermore, it is possible to reliably prevent the detection tube member 3 disposed in the groove portion 21a from slipping off and dropping out toward the vehicle rear side.

Further, the rear absorber 22 is characterized by having a hardness higher than that of the front absorber 21 and the tube member 3 for detection. According to this configuration, since the rear absorber 22 is harder than the front absorber 21 and the detection tube member 3, the rear absorber 22 is deformed before the front absorber 21 and the detection tube member 3 at the time of a collision. Can be prevented.

That is, a rear absorber 22 that is harder than the front absorber 21 and the detection tube member 3 is disposed on the vehicle rear side of the detection tube member 3 mounted in the groove 21 a of the front absorber 21, and further, the rear absorber 22. Since the bumper reinforcement 9, which is a rigid member, is disposed on the vehicle rear side, it is possible to reliably prevent the detection tube member 3 from being bent toward the vehicle rear side. Thereby, the tube member 3 for a detection can be deform | transformed appropriately at the time of a collision, and the collision detection accuracy of the vehicle collision detection apparatus 1 can be improved reliably.

The front absorber 21 and the rear absorber 22 are made of foamed resin, and the foamed resin forming the rear absorber 22 has a lower expansion ratio than the foamed resin forming the front absorber 21.

According to this configuration, the hardness of the rear absorber 22 can be easily made larger than the hardness of the front absorber 21 by lowering the expansion ratio of the rear absorber 22 than the expansion ratio of the front absorber 21.

In the present embodiment, since two pressure sensors 4 are disposed 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 Redundancy can be ensured. 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.

Next, second to eighth embodiments will be described with reference to FIGS. In FIGS. 6 to 14, 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 will be described.
(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIG. In the second embodiment, as shown in FIG. 6, an upper projecting portion 221 b that projects (projects) to the front side of the vehicle from the rear surface 21 b of the front absorber 21 is provided on the upper portion of the rear absorber 221. Yes. The upper overhanging portion 221b is in contact with the upper surface of the front absorber 21 and extends in the vehicle width direction.

Specifically, the length B at which the upper overhanging portion 221 b projects to the vehicle front side from the rear surface 21 b of the front absorber 21 is greater than the closest distance A between the front absorber 21 and the bumper cover 8. Is also getting longer. For this reason, even if the front absorber 21 is displaced to the vehicle front side, the lower surface of the upper overhanging portion 221b can be maintained in a state of being in contact with the upper surface of the front absorber 21. This prevents foreign objects, small animals, and the like from entering the groove 21a from the upper side of the groove 21a.

According to the above-described vehicle collision detection device 1 of the second embodiment, the upper absorber 221b is provided on the rear absorber 221 to improve the assembling property between the front absorber 21 and the rear absorber 221. Can do. That is, the rear absorber 221 is locked to the front absorber 21 by the upper overhanging portion 221b, so that the rear absorber 221 can be prevented from being displaced downward with respect to the front absorber 21. Thereby, the rear part absorber 221 can be stably arrange | positioned in a predetermined position.

Further, the upper overhanging portion 221b provided on the upper side of the groove portion 21a can prevent foreign matters, small animals, and the like from entering the groove portion 21a from the vehicle upper side outside the groove portion 21a, and is mounted in the groove portion 21a. It is possible to prevent the detection tube 3 from being damaged by foreign matter, small animals, or the like.
(Third embodiment)
Hereinafter, a third embodiment will be described with reference to FIG. In the third embodiment, compared to the third embodiment, as shown in FIG. 7, an upper overhanging portion 222 b is provided on the upper portion of the rear absorber 222, and in addition, in the rear absorber 222. A lower projecting portion 222c is provided at the lower portion. The lower overhanging portion 222c extends to the vehicle front side from the rear surface 21b of the front absorber 21 on the lower side of the groove portion 21a, is in contact with the lower surface of the front absorber 21, and extends in the vehicle width direction. .

Specifically, the length B in which the upper overhanging part 221b and the lower overhanging part 222c overhang the vehicle front side from the rear surface 21b of the front absorber 21 is between the front absorber 21 and the bumper cover 8. It is longer than the closest distance A. For this reason, even if the front part absorber 21 shifts to the front side of the vehicle, the upper overhanging part 221b and the lower overhanging part 222c can be maintained in a state of being in contact with the front absorber 21. This prevents foreign matters from entering the groove 21a from the upper and lower sides of the groove 21a.

In addition, a concave portion 222d is formed by the front surface 222a of the rear absorber 222, the upper overhang portion 222b, and the lower overhang portion 222c. The front absorber 21 and the rear absorber 222 are fixed and integrated by fitting the concave portion 222d of the rear absorber 222 with the front absorber 21.

According to the vehicle collision detection apparatus 1 of the third embodiment described above, since the upper overhanging portion 222b and the lower overhanging portion 222c are provided in the rear absorber 222, the vehicle upper side and lower side outside the groove portion 21a. It is possible to reliably prevent foreign matters and the like from entering the groove 21a from the side. Thereby, it can prevent reliably that the tube 3 for detection mounted in the groove part 21a is damaged.

Further, the front absorber 21 and the rear absorber 222 are assembled in a more stable manner to the rear absorber 222 because the front absorber 21 is fitted and fixed to the concave portion 222d of the rear absorber 222. be able to.

Note that the lengths of the upper overhanging portion 222b and the lower overhanging portion 222c overhanging (projecting) from the rear surface 21b of the front absorber 21 to the front side of the vehicle can be appropriately changed.
(Fourth embodiment)
Hereinafter, a fourth embodiment will be described with reference to FIG. The configuration of the fourth embodiment differs from that of the third embodiment in the following points. First, an upper recess 211c and a lower recess 211d are provided in the front absorber 211. Specifically, the upper concave portion 211c is formed in the upper portion of the rear surface 211b of the front absorber 211 in a rectangular cross section along the vehicle width direction. The lower concave portion 211d is formed in the lower part of the rear surface 211b of the front absorber 211 in a rectangular cross section along the vehicle width direction.

Further, an upper overhanging portion 223b of the rear absorber 223 is disposed in the upper concave portion 211c of the front absorber 211, and a lower overhanging portion 223c of the rear absorber 223 is disposed in the lower concave portion 211d of the front absorber 211. The That is, the outer shape of the upper concave portion 211 c of the front absorber 211 matches the outer shape of the upper overhanging portion 223 b of the rear absorber 223. Further, the outer shape of the lower concave portion 211d of the front absorber 211 matches the outer shape of the lower overhanging portion 223c of the rear absorber 223.

Note that, similarly to the third embodiment, the upper overhang portion 223b and the lower overhang portion 223c are provided so as to protrude from the rear surface 211b of the front absorber 211 toward the vehicle front side and extend in the vehicle width direction. Further, the length B in which the upper overhanging portion 223b and the lower overhanging portion 223c overhang from the rear surface 21b of the front absorber 21 to the vehicle front side is the closest between the front absorber 21 and the bumper cover 8. It is longer than the distance A.

Further, similarly to the third embodiment, a concave portion 223d is formed by the front surface 223a of the rear absorber 223, the upper overhanging portion 223b, and the lower overhanging portion 223c. The front absorber 211 and the rear absorber 223 are fixed and integrated by fitting the front absorber 211 into the concave portion 223d of the rear absorber 223.

The same effects as those of the third embodiment can also be obtained by the vehicle collision detection apparatus 1 of the fourth embodiment described above. Furthermore, in the fourth embodiment, since the upper overhanging portion 223b and the lower overhanging portion 223c do not protrude from the upper surface and the lower surface of the front absorber 211, it is possible to save the space of the bumper absorber 2. .
(Fifth embodiment)
Hereinafter, a fifth embodiment will be described with reference to FIG. In the fifth embodiment, compared with the first embodiment shown in FIG. 3, a fitting convex portion 212 c is formed on the rear surface 212 b of the front absorber 212 and is fitted on the front surface 224 a of the rear absorber 224. The difference is that the joint recess 224b is formed. Then, by fitting the fitting convex portion 212c of the front absorber 212 into the fitting concave portion 224b of the rear absorber 224, the front absorber 212 and the rear absorber 224 are fixed and integrated. Yes.

Specifically, on the rear surface 212b of the front absorber 212, there is formed a fitting convex portion 212c that protrudes toward the vehicle rear side, one on each of the vehicle upper side and the lower side of the groove portion 212a in which the detection tube member 3 is mounted. Has been. Further, one fitting recess 224b is formed on each of the upper and lower portions of the front surface 224a of the rear absorber 224 so as to be fitted to the fitting protrusion 212c of the front absorber 212.

According to the vehicle collision detection apparatus 1 of the fifth embodiment described above, the same effects as those of the first embodiment can be obtained, and the fitting protrusion 212c of the front absorber 212 and the fitting of the rear absorber 224 can be achieved. By fitting the mating recess 224b, the front absorber 212 and the rear absorber 224 can be more reliably fixed.

A fitting recess is provided on the rear surface 212b of the front absorber 212, a fitting protrusion is provided on the front surface 224a of the rear absorber 224, and the fitting protrusion of the rear absorber 224 is fitted into the fitting recess of the front absorber 212. You may make it match.
(Sixth embodiment)
Hereinafter, a sixth embodiment will be described with reference to FIG. In the sixth embodiment, compared with the third embodiment shown in FIG. 7, fitting convex portions 212 c are formed at two upper and lower portions of the rear surface 212 b of the front absorber 212, and the rear absorber 225 The difference is that the fitting recesses 225b are formed at two locations on the front surface 225a. The fitting convex portion 212 c of the front absorber 212 is fitted into the fitting concave portion 225 b of the rear absorber 225. Accordingly, the front absorber 212 and the rear absorber 225 are fixed and integrated.

Specifically, as in the fifth embodiment, the rear surface 212b of the front absorber 212 has one on the vehicle rear side and one on the vehicle upper side and the lower side of the groove portion 212a in which the detection tube member 3 is mounted. The fitting convex part 212c which protruded in this is formed. In addition, one fitting recess 224b is formed on each of the upper and lower portions of the front surface 225a of the rear absorber 225 so as to be fitted to the fitting protrusion 212c of the front absorber 212.

Similarly to the third embodiment, an upper overhanging portion 225b is provided in the upper portion of the rear absorber 225, and a lower overhanging portion 225c is provided in the lower portion of the rear absorber 225. In the sixth embodiment, the concave portion is not formed by the front surface 225a of the rear absorber 225, the upper projecting portion 225b, and the lower projecting portion 225c.

According to the vehicle collision detection apparatus 1 of the sixth embodiment described above, the same effects as those of the third embodiment can be obtained, and the fitting protrusion 212c of the front absorber 212 and the fitting of the rear absorber 225 can be achieved. By fitting the joint recess 225b, the front absorber 212 and the rear absorber 225 can be more reliably fixed.

A fitting recess is provided on the rear surface 212b of the front absorber 212, a fitting protrusion is provided on the front surface 225a of the rear absorber 225, and the fitting protrusion of the rear absorber 225 is fitted into the fitting recess of the front absorber 212. You may make it match.
(Seventh embodiment)
The seventh embodiment will be described below with reference to FIGS. 11 to 13. In the seventh embodiment, as shown in FIG. 11, the rear absorber 226 is different from the first embodiment in that the rear absorber 226 is provided facing only a part of the front absorber 21 in the vehicle width direction. Specifically, the rear absorber 226 is provided opposite to the front absorber 21 on the center side in the vehicle width direction (see FIG. 12), and is not provided on the left and right end portions in the vehicle width direction (see FIG. 12). 13).

In the bumper absorber 2 (the front absorber 21 and the rear absorber 226) configured as described above, the separation distance X between the rear surface 21b of the front absorber 21 and the front surface 9a of the bumper reinforcement 9 exists on the center side in the vehicle width direction. However, the present invention is applicable when there is no separation distance X on the left and right end sides in the vehicle width direction (the rear surface 21b of the front absorber 21 and the front surface 9a of the bumper reinforcement 9 are in contact).

In this case, in a portion where the separation distance X does not exist (including a case where the separation distance X is minute), the bumper reinforcement 9 that is a rigid member is provided on the vehicle rear side of the detection tube member 3. Therefore, the detection tube member 3 can be appropriately deformed without bending toward the vehicle rear side.

In addition, the thickness L in the vehicle front-rear direction of the front absorber 21 on the vehicle front side with respect to the detection tube member 3 mounted in the groove portion 21a is uniform over the entire vehicle width direction as in the first embodiment. Yes.

The separation distance X varies depending on the outer shape of the bumper cover 8 and the bumper reinforcement 9 (curvature of the curved portion, etc.). For this reason, it is only necessary to appropriately arrange the rear absorber according to the separation distance X which varies depending on the position in the vehicle width direction, and a plurality of rear absorbers may be arranged at intervals in the vehicle width direction. For example, in the configuration in which the separation distance X exists on the left and right end portions in the vehicle width direction and the separation distance X does not exist on the center portion side in the vehicle width direction, the two rear absorbers divided in the left and right directions May be disposed in a region where the separation distance X exists.

The same effects as those of the first embodiment can also be obtained by the vehicle collision detection apparatus 1 of the seventh embodiment described above. In particular, the rear absorber only needs to be provided in accordance with the separation distance X depending on the outer shape of the bumper cover 8 and the bumper reinforcement 9 (curvature of the curved portion, etc.), so that the space required for the bumper absorber 2 can be saved. It is possible to reduce the cost.
(Eighth embodiment)
Hereinafter, an eighth embodiment will be described with reference to FIG. Although the example which formed the groove part 21a only in the rear surface 21b of the front part absorber 21 was shown in the said 1st Embodiment, it is not restricted to this. The groove portion for mounting the detection tube member 3 may be formed only on the front surface 22a of the rear absorber 22, and is formed on both the rear surface 21b of the front absorber 21 and the front surface 22a of the rear absorber 22. Also good. In the eighth embodiment, as shown in FIG. 14, a groove 213 a is provided on the rear surface 213 b of the front absorber 213, and a groove 227 b is provided on the front surface 227 a of the rear absorber 227.

The groove portion 213a of the front absorber 213 and the groove portion 227b of the rear absorber 227 are disposed at positions facing each other. And the tube member 3 for a detection is arrange | positioned in the area | region (equivalent to a groove part) formed by the groove part 213a and the groove part 227b. It is assumed that the length of the groove portion 213a in the vehicle front-rear direction and the length of the groove portion 227b in the vehicle front-rear direction is equal to or longer than the length of the detection tube member 3 in the vehicle front-rear direction. Further, the length of the groove portion 213a and the groove portion 227b in the vehicle vertical direction is equal to or longer than the length of the detection tube member 3 in the vehicle vertical direction.

Also in this embodiment, the front absorber 213 has a uniform thickness L in the vehicle front-rear direction on the vehicle front side relative to the detection tube member 3 mounted between the groove 213a and the groove 227b over the entire vehicle width direction. It is.

The same effect as that of the first embodiment can be obtained by the vehicle collision detection apparatus 1 of the eighth embodiment described above. In particular, when the detection tube member 3 protrudes toward the vehicle rear side with respect to the groove portion 213a of the front absorber 213, the detection tube member 3 is adjusted by adjusting the length of the groove portion 227b of the rear absorber 227 in the vehicle front-rear direction. Can be appropriately disposed on the bumper absorber 2.

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 rear absorbers 22, 221 to 227 are made of a foamed resin having a lower expansion ratio than the front absorbers 21, 211 to 213. However, the present invention is not limited to this. The material of the rear absorbers 22, 221 to 227 may be any material as long as it has a hardness higher than that of the front absorbers 21, 211 to 213 and the detection tube member 3, and can be changed as appropriate.

Further, although two pressure sensors 4 are disposed on the left and right ends of the rear surface 9b of the bumper reinforcement 9, the pressure sensor 4 can be disposed at any position without being limited thereto. For example, the pressure sensor 4 may be disposed on the upper surface of the bumper reinforcement 9 or may be fixed to another rigid member. Furthermore, three or more pressure sensors 4 may be provided to improve redundancy.

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 (12)

1. A bumper absorber (2) disposed between a bumper cover (8) and a bumper reinforcement (9) of the vehicle, and a groove (21a, 21) formed in the bumper absorber (2) along the vehicle width direction. 211a to 213a, 227b), a detection tube member (3), and a pressure sensor (4) for detecting the pressure in the hollow portion (3a) formed in the detection tube member (3). In a vehicle collision detection device (1) for detecting a collision of an object with the bumper cover (8) based on a pressure detection result by the pressure sensor (4),
   The bumper absorber (2) includes a front absorber (21, 211 to 213) and a rear absorber (22, 221 to 227) divided in the vehicle longitudinal direction, and the front absorber ( 21, 211a to 213) and the grooves (21a, 211a to 213a) formed on at least one of the rear surface (21b, 211b to 213b) and the front surface (22a, 221a to 227a) of the rear absorber (22, 221 to 227). , 227b) is mounted with the detection tube member (3),
   The front absorbers (211, 211 to 213) have a thickness (L) in the vehicle front-rear direction on the vehicle front side with respect to the detection tube member (3) mounted in the grooves (21a, 211a to 213a, 227b). Is uniform throughout the vehicle width direction.
2. The separation distance (X) between the rear surface (21b, 211b, 212b) of the front absorber (21, 211, 212) and the front surface (9a) of the bumper reinforcement (9) varies depending on the position in the vehicle width direction.
   The vehicle rear end according to claim 1, wherein the rear absorber (22, 221 to 226) has a thickness in the vehicle front-rear direction set based on the separation distance (X) at a vehicle width direction position. Collision detection device.
3. The vehicle collision detection device according to claim 1 or 2, wherein a thickness of the rear absorber (22, 221 to 227) in the vehicle front-rear direction varies depending on a position in the vehicle width direction.
4. The groove portions (21a, 211a to 213a) are formed on the rear surfaces (21b, 211b to 213b) of the front absorbers (211, 211 to 213),
   The detection tube member (3) is attached to the groove (21a, 211a to 213a) formed on the rear surface (21b, 211b to 213b) of the front absorber (21, 211 to 213). The collision detection apparatus for vehicles according to any one of claims 1 to 3 characterized by things.
5. 5. The rear absorber (22, 221 to 227) is provided so as to face a part of the front absorber (21, 211 to 213) in the vehicle width direction. The vehicle collision detection device according to claim 1.
6. The vehicle according to claim 5, wherein the rear absorber (22, 221 to 225, 227) is provided so as to face the entire vehicle width direction of the front absorber (21, 211 to 213). Collision detection device.
7. 7. The rear absorber (22, 221 to 227) is harder than the front absorber (21, 211 to 213) and the detection tube member (3). The vehicle collision detection device according to one item.
8. The front absorbers (211, 211 to 213) and the rear absorbers (22, 221 to 227) are made of foamed resin,
   The foamed resin forming the rear absorber (22, 221 to 227) has a lower expansion ratio than the foamed resin forming the front absorber (21, 211 to 213). Vehicle collision detection device.
9. The rear absorbers (221 to 223, 225) are more vehicles than the rear surfaces (21b, 211b, 212b) of the front absorbers (21, 211, 212) above the grooves (21a, 211a, 212a). The vehicle collision detection device according to any one of claims 1 to 8, further comprising an upper projecting portion (221b to 223b, 225b) projecting forward and extending in the vehicle width direction.
10. The rear absorbers (222, 223, 225) are located on the lower side of the grooves (21a, 211a, 212a) and on the vehicle front side than the rear surfaces (21b, 211b, 212b) of the front absorbers (21, 211, 212). The vehicle collision detection device according to any one of claims 1 to 9, further comprising a lower projecting portion (222c, 223c, 225c) projecting toward the vehicle and extending in the vehicle width direction.
11. The rear absorbers (222, 223) protrude above the rear surfaces (21b, 211b) of the front absorbers (21, 211) and extend in the vehicle width direction above the grooves (21a, 211a). An upper overhanging part (222b, 223b) and a lower side of the groove part (21a, 211a) project over the front side of the front absorber (21, 211) and the rear surface (21b, 211b) and in the vehicle width direction An extending lower portion (222c, 223c),
    The front absorber (21, 211) and the rear absorber (222, 223) are the upper overhang (222b, 223b), the lower overhang (222c, 223c), and the rear absorber (222, 223). The front absorber (21, 211) is fixed and integrated by fitting the concave shape portion (222d, 223d) formed by the front surface (222a, 223a). The vehicle collision detection device according to any one of 1 to 8.
12. A fitting projection (212c) is formed on one of the front absorber (212) rear surface (212b) and the rear absorber (224, 225) front surface (224a, 225a) and the other fitting projection ( 212c) is formed with fitting recesses (224b, 225b) that can be fitted,
    The front absorber (212) and the rear absorber (224, 225) are fixed and integrated by fitting the fitting convex portion (212c) and the fitting concave portion (224b, 225b). The vehicle collision detection device according to any one of claims 1 to 11,
    
    

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