JP2017094911A - Collision detection device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately determine damage to a component member of a vehicle bumper.SOLUTION: A collision detection device for a vehicle comprises: an acceleration sensor 22 for detecting an acceleration of a vehicle; a pressure sensor 48 provided to a vehicle bumper for determining a collision against a collided object and detecting a pressure in a space of a pressure tube having the space formed in it; and a control device 12 which, when an acceleration of not less than a predetermined threshold value has been detected by the acceleration sensor 22 and an increase in the pressure has been detected by the pressure sensor 48, determines that damage of such an extent that it affects next determination of collision has occurred to a component member of the vehicle bumper.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle collision detection device that detects a collision between a vehicle and an object.

  The vehicle collision detection device of Patent Document 1 includes a detection unit that includes a chamber member that is disposed in a vehicle bumper and in which a chamber space is formed, and a pressure sensor that detects a pressure in the chamber space. Based on the result, an object collision with the vehicle bumper is detected. And the damage of a vehicle bumper is determined based on the pressure detection result by a pressure sensor, and when it determines with having received damage more than predetermined, it notifies the failure of a detection unit.

JP 2010-070129 A

  However, in Patent Document 1, there is a case where the detection range of the pressure sensor is overranged and the accurate pressure may not be detected due to a light collision of the vehicle. There is room for improvement to do.

  The present invention has been made in consideration of the above-described facts, and an object thereof is to accurately determine the damage to the structural members of the vehicle bumper.

  In order to achieve the above object, the invention described in claim 1 is provided in an acceleration detection unit for detecting the acceleration of the vehicle and a vehicle bumper for determining a collision with a collision object, and a space is formed in the interior. A pressure detection unit that detects a pressure in the space of the space member that has been detected, and an acceleration that is equal to or greater than a predetermined threshold value is detected by the acceleration detection unit, and a rise in pressure is detected by the pressure detection unit, And a determination unit that determines that damage of a level that affects the next collision determination has occurred in the constituent members of the vehicle bumper.

  According to the first aspect of the present invention, the acceleration detector detects the acceleration of the vehicle. The pressure detector is provided in the vehicle bumper in order to determine a collision with the collision target. The pressure detector detects the pressure in the space of the space member in which the space is formed.

  In the determination unit, when the acceleration detection unit detects an acceleration that is equal to or higher than a predetermined threshold value, and the pressure detection unit detects an increase in pressure, the level of damage that affects the next collision determination is detected by the vehicle bumper. It is determined that this occurred in the constituent member. That is, even if the pressure detection unit is over the range, the pressure increase can be detected, so that it is possible to accurately determine the damage to the constituent members of the vehicle bumper.

  As described above, according to the present invention, there is an effect that it is possible to accurately determine the damage to the structural members of the vehicle bumper.

It is a block diagram which shows schematic structure of the collision detection apparatus for vehicles which concerns on 1st Embodiment. FIG. 2 is an exploded perspective view of a schematic configuration around a vehicle bumper. 2 is an enlarged cross section of a part of a schematic configuration around a vehicle bumper. It is a figure which shows the logical operation of the light collision diagnosis determination showing that the damage of the level which affects a collision determination generate | occur | produced in the structural member of the vehicle bumper in the control apparatus of the vehicle collision detection apparatus which concerns on 1st Embodiment. It is a block diagram which shows schematic structure of the collision detection apparatus for vehicles which concerns on 2nd Embodiment. It is a figure which shows the logical operation of the light collision diagnosis determination showing that the damage of the level which affects collision determination generate | occur | produced in the structural member of the vehicle bumper in the control apparatus of the vehicle collision detection apparatus which concerns on 2nd Embodiment. It is a block diagram which shows schematic structure of the collision detection apparatus for vehicles which concerns on 3rd Embodiment. It is a figure which shows the logical operation of the light collision diagnosis determination showing that the damage of the level which affects collision determination generate | occur | produced in the structural member of the vehicle bumper in the control apparatus of the vehicle collision detection apparatus which concerns on 3rd Embodiment.

Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram illustrating a schematic configuration of the vehicle collision detection apparatus according to the first embodiment.

  The vehicle collision detection device 10 according to the present embodiment includes a control device 12 that performs various controls for detecting a collision between a vehicle and an object (a collision target).

  The control device 12 is composed of a microcomputer including a CPU 14, ROM 16, RAM 18, and I / O 20, and each of the CPU 14, ROM 16, RAM 18, and I / O 20 can exchange commands and data via a bus 21. Each is connected.

  The ROM 16 stores a program for detecting a collision between the vehicle and the object, a threshold value for detecting the collision, and the like, and the CPU 14 executes the program stored in the ROM 16 so that the vehicle and the object are detected. Control to detect a collision is performed. In addition, the ROM 16 also stores a program for determining damage to the structural members of the vehicle bumper that affects the collision determination. The RAM 18 is used as a cache memory or the like when executing a program.

  An acceleration sensor 22 and a pressure sensor 48 are connected to the I / O 20. The acceleration sensor 22 is a detector that detects acceleration generated in the vehicle due to a collision or the like. The acceleration sensor 22 is, for example, at least an air bag floor acceleration sensor (hereinafter referred to as an A / B floor G sensor) and an air bag front satellite acceleration sensor (hereinafter referred to as an A / B front satellite G sensor). One can be applied. The pressure sensor 48 is a detector that detects a physical quantity related to pressure generated by a collision of an object at a predetermined position of the vehicle bumper (details will be described later). The pressure sensor 48 detects a pressure in the space of the space member by providing a vehicle bumper with a space member having a space formed therein, such as a pressure chamber or a pressure tube.

  The control device 12 detects a collision of the vehicle with a pedestrian or the like based on the detection value of the pressure sensor 48. In addition, if a component (for example, an absorber described later) of the vehicle bumper related to the mounting structure of the vehicle bumper is damaged, it affects the next collision determination. Based on the detected value, it has a function of determining whether or not damage of a level that affects the next collision determination has occurred in the structural member of the vehicle bumper.

  In the present embodiment, the acceleration sensor 22 is an example of the acceleration detection unit of the present invention, and the pressure sensor 48 is an example of the pressure detection unit of the present invention. Moreover, the control apparatus 12 is an example of the determination part of this invention.

  FIG. 2 is an exploded perspective view showing a schematic configuration around the vehicle bumper. In FIG. 2, the arrow UP, the arrow FR, and the arrow OUT indicate the vehicle vertical direction upper side, the vehicle front-rear direction front side, and the vehicle width direction outer side (left side).

  The vehicle bumper 30 is provided in the front part of a vehicle such as a passenger car, for example. The vehicle bumper 30 includes a front bumper cover 32, a bumper reinforcement 34, and an absorber 38. A contact sensor 24 including a pressure tube 46 and a pressure sensor 48 is disposed on the rear side of the absorber 38 (details will be described later).

  The front bumper cover 32 covers the bumper reinforcement 34 from the front side of the vehicle, and is attached to the vehicle body via the bumper reinforcement 34 and the like. In the lower part of the front bumper cover 32, an opening 32A for introducing wind into the radiator 42 disposed on the rear side of the bumper reinforcement 34 is formed. The bumper reinforcement 34 is formed in a long shape extending in the vehicle width direction and disposed in the vehicle. The absorber 38 is disposed with the vehicle width direction as a longitudinal direction. The absorber 38 is disposed on the vehicle rear side of the front bumper cover 32.

  FIG. 3 is an enlarged cross-section of a part of the schematic configuration around the vehicle bumper. The bumper reinforcement 34 is formed in a hollow, substantially rectangular column shape made of a metal material such as aluminum, and is disposed on the vehicle rear side of the front bumper cover 32 with the vehicle width direction as a longitudinal direction.

  The absorber 38 is made of a foamed resin material such as urethane foam, is provided between the front bumper cover 32 and the bumper reinforcement 34, and is formed in a long shape with the vehicle width direction as the longitudinal direction. . The absorber 38 is formed in a substantially rectangular shape in a cross-sectional view viewed from the longitudinal direction. The absorber 38 is disposed adjacent to the front side of the vehicle at a predetermined portion (for example, the upper portion) of the bumper reinforcement 34 and is fixed to the front surface 34A of the bumper reinforcement 34. A holding groove 44 for holding a pressure tube 46 described later is formed on the rear surface 38A of the absorber 38. The holding groove 44 is formed in a substantially C-shape that is open to the rear side of the vehicle in a side sectional view (specifically, a circular shape that is partially open to the rear side of the vehicle) and penetrates in the longitudinal direction of the absorber 38. ing.

  The pressure tubes 46 are connected to pressure sensors 48 provided at both ends in the vehicle width direction (see FIG. 2), and the contact sensor 24 is configured by the pressure tubes 46 and the pressure tubes 46. That is, the contact sensor 24 includes a long pressure tube 46 and a pressure sensor 48 that outputs a signal corresponding to a pressure change in the pressure tube 46. The pressure tube 46 is configured as a hollow structure having a substantially annular cross section. The outer diameter of the pressure tube 46 is set slightly smaller than the inner diameter of the holding groove 44 of the absorber 38, and the length of the pressure tube 46 in the longitudinal direction is the length of the absorber 38 in the longitudinal direction. It is set longer than that. The pressure tube 46 is assembled (fitted) into the holding groove 44 so that the pressure tube 46 is disposed along the longitudinal direction of the absorber 38.

  In a state where the pressure tube 46 is assembled in the holding groove portion 44 of the absorber 38, the outer peripheral surface of the pressure tube 46 is in contact with the rear surface 38 </ b> A of the absorber 38 or a slight gap as viewed in the longitudinal direction of the absorber 38. It is arranged with a gap. Thereby, the pressure tube 46 is disposed adjacent to the front surface 34 </ b> A of the bumper reinforcement 34. When the load on the rear side of the vehicle acts on the absorber 38 and the absorber 38 presses the pressure tube 46, a reaction force is generated on the pressure tube 46 by the bumper reinforcement 34. Pressure sensors 48 provided at both ends of the pressure tube 46 in the vehicle width direction are electrically connected to the control device 12, and the pressure tube 46 is deformed so that a signal corresponding to a pressure change in the pressure tube 46 is a pressure sensor. 48 is output to the control device 12.

  2 shows an example in which the pressure sensors 48 are provided at both ends of the pressure tube 46, but the present invention is not limited to providing the pressure sensors 48 at both ends of the pressure tube 46. For example, it may be provided at any one end of the pressure tube 46, may be provided at the middle of the pressure tube 46, or may be provided in combination of three or more. Furthermore, a plurality of contact sensors 24 constituted by the pressure tube 46 and the pressure sensor 48 may be arranged in the vertical direction of the vehicle bumper 30.

  Next, in the control device 12 of the vehicle collision detection device 10 according to the first embodiment, a determination logic for determining whether damage at a level that affects the collision determination has occurred in the constituent members of the vehicle bumper 30 will be described. FIG. 4 shows a logical operation of a light collision diagnosis determination indicating that damage of a level affecting the collision determination has occurred in the constituent members of the vehicle bumper 30 in the control device 12 of the vehicle collision detection apparatus 10 according to the first embodiment. FIG. The logical operation of FIG. 4 is performed by executing a program stored in the ROM 16, for example.

  When the acceleration detected by the acceleration sensor 22 is input, the control device 12 performs a speed change amount determination 50. The speed change amount determination 50 detects a collision in which the absorber 38 is damaged from the speed change amount and the input acceleration. For example, the speed change amount is detected by time-integrating the detection value of the acceleration sensor 22, and it is determined whether or not the detected acceleration is equal to or greater than a predetermined threshold, and whether or not the detected acceleration is equal to or greater than the predetermined threshold. In the present embodiment, the speed change amount determination 50 outputs a high level when the speed change amount and the acceleration are each equal to or greater than a threshold value.

  Further, when the pressure detected by the pressure sensor 48 is input, the control device 12 performs a pressure determination 52. The pressure determination 52 determines whether or not a pressure change (pressure increase) is detected by the pressure sensor 48. In the present embodiment, the pressure determination 52 outputs a high level when a pressure increase is detected.

  Then, the control device 12 takes a logical sum 54 of the speed change amount determination 50 and the pressure determination 52, and performs a light collision diagnosis determination 56 that indicates whether or not a component member (for example, the absorber 38) of the vehicle bumper is damaged. Output. That is, the determination result as to whether there is a possibility that the structural member of the vehicle bumper 30 is damaged is output as the light collision diagnosis determination 56. When there is a possibility that the structural member of the vehicle bumper 30 is damaged by the light collision diagnosis determination 56 (when the output of the logical sum 54 is at a high level), information indicating that is stored in the control device 12 as a log. . Thereby, it is possible to determine whether or not there is a possibility that the absorber 38 or the like is damaged by reading the information. In the present embodiment, information indicating that the constituent members of the vehicle bumper 30 such as the absorber 38 may be damaged is stored as a log, but may be notified to the occupant by a warning light or the like.

  Next, the operation of the vehicle collision detection apparatus 10 according to the present embodiment configured as described above will be described.

  When a collision object collides with the vehicle bumper 30, the load of the collision object is transmitted to the absorber 38 and further to the pressure tube 46. As a result, the pressure in the pressure tube 46 increases, a pressure change is detected by the pressure sensor 48, and the pressure determination 52 becomes a high level output.

  Further, acceleration is detected by the acceleration sensor 22, and a speed change determination 50 is performed. When the speed change amount determination 50 detects a speed change amount and acceleration that are equal to or greater than the threshold value, the speed change amount determination 50 becomes a high-level output. In addition, when the front satellite G sensor for A / B is applied as the acceleration sensor 22, it is excellent in detecting the degree of collision that slightly wraps at the end of the bumper. However, the A / B front satellite G sensor cannot detect the speed change amount more accurately than when the A / B floor G sensor is applied.

  Then, the logical sum 54 of the speed change amount determination 50 and the pressure determination 52 is obtained, and in the case of each of the high levels, damage of a level that affects the collision determination occurs in the constituent members of the vehicle bumper 30 as the light collision diagnosis determination 56. Information indicating this is stored in the control device 12. Therefore, by reading the light collision diagnosis determination 56 stored in the control device 12, it is possible to determine whether or not damage of a level that affects the collision determination has occurred in the absorber 38 or the like.

  By the way, when the range of the pressure sensor 48 is a range in which a collision with a pedestrian is detected, the range is over due to a load equivalent to or more than a person. In addition to this, since the deformation characteristics of the front bumper cover 32 vary due to the influence of temperature or the like, the damage of the structural members of the vehicle bumper 30 cannot be accurately detected only by the detection result of the pressure sensor 48. However, in the present embodiment, the logical sum 54 of the pressure determination 52 for determining the pressure increase based on the detection value of the pressure sensor 48 and the speed change amount determination 50 using the detection value of the acceleration sensor 22 is taken. Thereby, even if the pressure sensor 48 is over the range, the pressure increase can be detected, so that it is possible to accurately determine the breakage of the constituent members of the vehicle bumper 30.

(Second Embodiment)
Next, the vehicle collision detection device according to the second embodiment will be described. FIG. 5 is a block diagram illustrating a schematic configuration of the vehicle collision detection device according to the second embodiment. In addition, about the same structure as 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In the vehicle collision detection device 11 according to the first embodiment, the example in which the acceleration sensor 22 is connected to the control device 12 has been described. However, in the second embodiment, instead of directly connecting the acceleration sensor 22 to the control device 12. An airbag ECU (A / B-ECU) 24 is connected to the control device 12.

  An acceleration sensor 22 and an airbag device (A / B device) 26 are connected to the A / B-ECU 24, and the A / B-ECU 24 is connected to the A / B-ECU 24 based on the detection value of the acceleration sensor 22. Control deployment. For example, the A / B-ECU 24 deploys the A / B device 26 by outputting a deployment signal for deploying the A / B device 26 when acceleration equal to or greater than a predetermined threshold is detected. As in the first embodiment, at least one of the A / B floor G sensor and the A / B front satellite G sensor can be applied to the acceleration sensor 22.

  In the present embodiment, the control device 12 determines whether or not the bumper member has a level of damage that affects the next collision determination based on the deployment signal from the A / B-ECU 24 and the detection value of the pressure sensor 48. judge.

  Next, determination logic for determining whether or not the bumper member has a level of damage that affects collision determination in the control device 12 of the vehicle collision detection device 11 according to the second embodiment will be described. FIG. 6 shows a logical operation of light collision diagnosis determination indicating that damage of a level affecting the collision determination has occurred in the constituent members of the vehicle bumper 30 in the control device 12 of the vehicle collision detection apparatus 11 according to the second embodiment. FIG. The logical operation of FIG. 6 is performed by executing a program stored in the ROM 16, for example.

  When the acceleration detected by the acceleration sensor 22 is input to the A / B-ECU 24, the A / B-ECU 24 makes an A / B deployment determination 51 as to whether or not to deploy the A / B device 26. 12 acquires the result of the A / B development determination 51. Specifically, the A / B deployment determination 51 outputs a high level when a deployment signal for deploying the A / B device 26 is output from the A / B-ECU 24.

  Moreover, the control apparatus 12 performs the pressure determination 52, if the pressure detected by the pressure sensor 48 is input similarly to 1st Embodiment. The pressure determination 52 determines whether or not a pressure change (pressure increase) is detected by the pressure sensor 48. In the present embodiment, the pressure determination 52 outputs a high level when a pressure increase is detected.

  Then, the control device 12 calculates the logical sum 55 of the A / B deployment determination 51 and the pressure determination 52, and indicates a light collision diagnosis determination indicating whether or not the constituent member (for example, the absorber 38) of the vehicle bumper 30 is damaged. 56 is output. That is, the determination result as to whether there is a possibility that the structural member of the vehicle bumper 30 is damaged is output as the light collision diagnosis determination 56. When the component of the vehicle bumper 30 may be damaged due to the light collision diagnosis determination 56 (when the output of the logical sum 55 is at a high level), information indicating that is stored in the control device 12 as a log. . As a result, it is possible to determine whether or not there is a possibility that the constituent members of the vehicle bumper 30 such as the absorber 38 are damaged by reading the information. In the present embodiment, information indicating that the absorber 38 may be damaged is stored as a log, but may be notified to a passenger by a warning light or the like.

  Then, the effect | action of the vehicle collision detection apparatus 11 which concerns on this embodiment comprised as mentioned above is demonstrated.

  When a collision object collides with the vehicle bumper 30, the load of the collision object is transmitted to the absorber 38 and further to the pressure tube 46. As a result, the pressure in the pressure tube 46 increases, a pressure change is detected by the pressure sensor 48, and the pressure determination 52 becomes a high level output.

  Further, acceleration is detected by the acceleration sensor 22, and A / B development determination 51 is performed by the A / B-ECU 24. When a development signal is output by the A / B development judgment 51, the A / B development judgment 51 becomes a high level output.

  Then, the logical sum 55 of the A / B development determination 51 and the pressure determination 52 is taken, and in the case of each high level, as a light collision diagnosis determination 56, damage at a level that affects the collision determination is applied to the structural members of the vehicle bumper 30. Information representing the occurrence is stored in the control device 12. Therefore, by reading the light collision diagnosis determination 56 stored in the control device 12, it is possible to determine whether or not damage at a level that affects the collision determination has occurred in the structural members of the vehicle bumper 30, such as the absorber 38. it can.

  As a result, as in the first embodiment, it is possible to accurately determine whether or not the constituent members of the vehicle bumper 30 are damaged even if the pressure sensor 48 is over the range.

  In the present embodiment, the determination speed is made higher than that in the first embodiment because the determination is performed in synchronization with the deployment of the A / B device 26 at the time of a high-speed collision in which the speed change amount determination 50 in the first embodiment is not in time. Can do. However, although the determination speed is increased, a high threshold is set, so that it is difficult to detect a collision at a low speed below a predetermined speed.

(Third embodiment)
Subsequently, a vehicle collision detection apparatus according to a third embodiment will be described. FIG. 7 is a block diagram illustrating a schematic configuration of the vehicle collision detection apparatus according to the third embodiment. In addition, about the same structure as 1st Embodiment and 2nd Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The vehicle collision detection device 13 according to the third embodiment also includes the control device 12, and the configuration of the control device 12 is the same as that of each of the above-described embodiments, and thus detailed description thereof is omitted.

  In the present embodiment, an A / B floor G sensor 22A, an A / B satellite G sensor 22B, an A / B-ECU 24, and a pressure sensor 48 are connected to the I / O 20 of the control device 12, respectively.

  An A / B floor G sensor 22A, an A / B front satellite G sensor 22B, and an A / B device 26 are connected to the A / B-ECU 24, respectively. The A / B-ECU 24 controls the deployment of the A / B device 26 based on the detection values of the A / B floor G sensor 22A and the A / B front satellite G sensor 22B. For example, the A / B-ECU 24 deploys the A / B device 26 by outputting a deployment signal for deploying the A / B device 26 when acceleration equal to or greater than a predetermined threshold is detected.

  In the present embodiment, the control device 12 performs the next time based on the deployment signal of the A / B device 26 and the detection values of the A / B floor G sensor 22A, the A / B floor satellite G sensor 22B, and the pressure sensor 48. It is determined whether or not the bumper member has a level of damage that affects the collision determination.

  FIG. 8 is a logical operation of a light collision diagnosis determination indicating that damage of a level that affects the collision determination has occurred in the constituent members of the vehicle bumper 30 in the control device 12 of the vehicle collision detection device 13 according to the third embodiment. FIG. The logical operation of FIG. 8 is performed by executing a program stored in the ROM 16, for example.

  When the acceleration detected by the A / B floor G sensor 22A is input, the control device 12 performs a speed change amount determination 50A and a collision acceleration determination 50B. The speed change amount determination 50A and the collision acceleration determination 50B detect a collision in which the absorber 38 is damaged from the speed change amount and the input acceleration. For example, the speed change amount determination 50A detects the speed change amount by time-integrating the detection value of the A / B floor G sensor 22A, determines whether or not it is equal to or greater than a predetermined threshold, and the collision acceleration determination 50B Whether the detected acceleration is equal to or greater than a predetermined threshold value is determined. In the present embodiment, it is assumed that the speed change amount determination 50A and the collision acceleration determination 50B each output a high level when the speed change amount and the acceleration are equal to or greater than the respective threshold values.

  Further, when the acceleration detected by the A / B front satellite G sensor 22B is input, the control device 12 performs a speed change amount determination 50C and a collision acceleration determination 50D. The speed change amount determination 50C and the collision acceleration determination 50D detect a collision in which the absorber 38 is damaged from the speed change amount and the input acceleration. For example, the speed change amount determination 50A detects the speed change amount by time-integrating the detection value of the A / B front satellite G sensor 22B, determines whether or not the speed change amount is equal to or greater than a predetermined threshold, and determines the collision acceleration determination 50D. Determines whether the detected acceleration is greater than or equal to a predetermined threshold. In the present embodiment, it is assumed that the speed change amount determination 50C and the collision acceleration determination 50D each output a high level when the speed change amount and the acceleration are equal to or greater than the respective threshold values.

  Further, when the pressure detected by the pressure sensor 48 is input, the control device 12 performs a pressure determination 52. The pressure determination 52 determines whether or not a pressure change (pressure increase) is detected by the pressure sensor 48. In the present embodiment, the pressure determination 52 outputs a high level when a pressure increase is detected.

  Further, the control device 12 outputs the logical sum 58 of the speed change amount determination 50A and the collision acceleration determination 50B, and the output of the logical sum 60 of the speed change amount determination 50C and the collision acceleration determination 50D, as described in the second embodiment. The logical product 62 with the A / B development determination 51 is obtained. Then, the output of the logical product 62 and the logical sum 64 of the pressure determination 52 are taken, and a light collision diagnosis determination 56 indicating whether or not the constituent member (for example, the absorber 38) of the vehicle bumper 30 is damaged is output. That is, the determination result as to whether there is a possibility that the structural member of the vehicle bumper 30 is damaged is output as the light collision diagnosis determination 56. When there is a possibility that the structural member of the vehicle bumper 30 is damaged due to the light collision diagnosis determination 56 (when the output of the logical sum 64 is high level), information indicating that is stored in the control device 12 as a log. . As a result, it is possible to determine whether or not the absorber 38 may be damaged by reading the information. In the present embodiment, information indicating that the constituent members of the vehicle bumper 30 such as the absorber 38 may be damaged is stored as a log, but may be notified to the occupant by a warning light or the like.

  Then, the effect | action of the vehicle collision detection apparatus 13 which concerns on this embodiment comprised as mentioned above is demonstrated.

  When a collision object collides with the vehicle bumper 30, the load of the collision object is transmitted to the absorber 38 and further to the pressure tube 46. As a result, the pressure in the pressure tube 46 increases, a pressure change is detected by the pressure sensor 48, and the pressure determination 52 becomes a high level output.

  Further, as described in the second embodiment, the A / B development determination 51 is performed by the A / B-ECU 24. When the development signal is output by the A / B development determination 51, the A / B development determination 51 becomes a high level output, and when the development signal is not outputted, the A / B development judgment 51 becomes a low level output.

  On the other hand, acceleration is detected by each of the A / B floor G sensor 22A and the A / B front satellite G sensor 22B, and speed change determinations 50A and 50C and collision acceleration determinations 50B and 50D are performed, respectively. When a speed change amount equal to or greater than the threshold value is detected by each of the speed change amount determinations 50A and 50C, the speed change amount determinations 50A and 50C are respectively output at a high level. Further, when accelerations greater than or equal to the threshold are detected by the collision acceleration determinations 50B and 50D, the collision acceleration determinations 50B and 50D are output at a high level.

  Also, the logical sum 58 of the speed change determination 50A and the collision acceleration determination 50B and the logical sum 60 of the speed change determination 50C and the collision acceleration determination 50D are taken, respectively, and the outputs of the logical sums 58 and 60 and the A / B The logical product 62 of the development determination 51 is taken.

  Then, the logical sum 64 of the output of the logical product 62 and the pressure determination 52 is obtained, and in the case of each of the high levels, as a light collision diagnosis determination 56, damage at a level that affects the collision determination is a constituent member of the vehicle bumper 30. Information indicating that the error occurred is stored in the control device 12. Therefore, by reading the light collision diagnosis determination 56 stored in the control device 12, it is possible to determine whether or not damage of a level that affects the collision determination has occurred in the absorber 38 or the like.

  Thereby, similarly to the first embodiment and the second embodiment, it is possible to accurately determine the breakage of the constituent members of the vehicle bumper 30 even if the pressure sensor 48 is over the range.

  Note that the processing performed by the control device 12 in the above embodiment may be software processing performed by executing a program or may be processing performed by hardware. Alternatively, the processing may be a combination of both software and hardware. The program stored in the ROM may be stored and distributed in various storage media.

  Furthermore, the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

10 vehicle collision detection device 12 control device (determination unit)
22 Acceleration sensor (acceleration detector)
22A A / B floor G sensor (acceleration detector)
22B A / B front satellite G sensor (acceleration detector)
30 Bumper for vehicle 46 Pressure tube 48 Pressure sensor (pressure detector)

Claims (1)

An acceleration detector for detecting the acceleration of the vehicle;
A pressure detection unit that is provided in a vehicle bumper for determining a collision with a collision target and detects a pressure in the space of a space member in which a space is formed;
When an acceleration equal to or higher than a predetermined threshold is detected by the acceleration detection unit, and when a pressure increase is detected by the pressure detection unit, damage at a level that affects the next collision determination is applied to the structural member of the vehicle bumper. A determination unit that determines that has occurred;
A vehicle collision detection device.

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