JP5862426B2 - Collision detection device - Google Patents

Description

  The present invention relates to a collision detection device that detects a collision of a vehicle.

  Conventionally, as a means for detecting a side collision of a vehicle, a technique of providing a side collision detection sensor on the side of the vehicle is known. The detection result of the side collision detection sensor is used for controlling an occupant protection device that protects the occupant from an impact at the time of a collision, for example. For example, in Patent Document 1 below, a side collision detection sensor is provided below the center pillar (B pillar) on the side of the vehicle, and whether or not the curtain airbag needs to be deployed is determined based on a signal from the side collision detection sensor. Deciding.

JP 2011-235833 A

  However, the technique according to Patent Document 1 described above has a problem that the form of collision cannot be determined. As a form of collision at the time of a side collision, for example, there is a case where it collides with a columnar stationary object such as a standing tree or a utility pole, or a case where it collides with another vehicle from the side. Depending on the form of the collision, the part where the occupant is impacted and the damage state of the vehicle will differ, so if the form of the collision can be determined, the occupant protection device can be activated more appropriately, or the vehicle emergency control May be possible.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a collision detection device that can detect the form of the collision at the time of a vehicle side collision.

In order to solve the above-described problems and achieve the object, an acceleration control device according to the present invention is a collision detection device that detects the form of a collision at the time of a side collision of a vehicle, and includes a plurality of predetermined on the side of the vehicle. A plurality of side collision detection sensors provided at each location, and an estimation means for estimating the form of the collision based on a difference between a plurality of detection values respectively detected by the plurality of side collision detection sensors , the estimating means based on the difference between the detected value after a predetermined time has passed since the side collision is started to be detected by the side collision sensor performs the estimation, characterized by the this.

According to the present invention, since the form of the collision is estimated based on the difference between the plurality of detection values at the plurality of predetermined positions respectively detected by the plurality of side collision detection sensors, the form of the collision of the vehicle can be obtained with a simple configuration. Can be detected.
According to the present invention, it is possible to reliably estimate the case where the side surface of the vehicle collides with a columnar stationary object and the case where the vehicle collides with another vehicle from the side surface, thereby detecting the form of the collision.
According to the present invention, since the estimation is performed based on the difference between the detection values after the elapse of a predetermined time after the side collision detection is started by the side collision detection sensor, the collision mode is detected by shortening the predetermined time. Results can be obtained quickly.
According to the present invention, since the side collision detection sensor is provided at a position that substantially covers the occupant boarding position, it becomes easier to estimate the form of the collision and more reliable. It also makes it easier to estimate the impact of the collision on the occupant.

It is a block diagram which shows the functional structure of the collision detection apparatus 100 concerning embodiment. It is explanatory drawing which shows an example of the installation position of the side collision detection sensor. It is explanatory drawing which shows the estimation method of the collision form by the estimation means. 4 is a flowchart illustrating a procedure of collision detection processing by the collision detection device 100.

  Exemplary embodiments of a collision detection apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Embodiment)
FIG. 1 is a block diagram illustrating a functional configuration of a collision detection apparatus 100 according to the embodiment. The collision detection device 100 includes a side collision detection sensor 101 and an estimation unit 102, and detects the form of the collision at the time of a side collision of the vehicle.

  The side collision detection sensor 101 is a sensor for detecting an impact on the vehicle. For example, a sensor that detects an acceleration applied to the vehicle or a deformation amount of the vehicle body, a sensor that detects a pressure change inside the vehicle, or the like is used. it can. In the present embodiment, an acceleration sensor is used as the side collision detection sensor 101. The side collision detection sensor 101 is provided at each of a plurality of predetermined locations on the side surface of the vehicle. The plurality of predetermined locations where the side collision detection sensors 101 are provided are set such that the plurality of side collision detection sensors 101 are at different positions in the vehicle front-rear direction. The side collision detection sensor 101 includes, for example, a vehicle front seat door, a vehicle rear seat door, a pillar between the front seat door and the rear seat door (center pillar, B pillar), Of these, at least two are provided.

  FIG. 2 is an explanatory diagram illustrating an example of an installation position of the side collision detection sensor 101. FIG. 2 is a top view of the vehicle 200. The vehicle 200 is provided with a front seat door FD and a rear seat door RD, and a center pillar BP is provided between these doors. In the present embodiment, the side collision detection sensors 101 are provided at three locations per one side surface of the center pillar BP and the front seat door FD of the vehicle, the rear seat door RD of the vehicle. . Hereinafter, the side collision detection sensor 101 provided on the front seat door FD is provided on the front door sensor FDS, and the side collision detection sensor 101 provided on the rear seat door RD is provided on the rear door sensor RDS and the center pillar BP. The side collision detection sensor 101 is referred to as a center pillar sensor BPS.

  Returning to the description of FIG. 1, the estimation means 102 has an interface with a CPU, a ROM for storing and storing a control program, a RAM as an operation area of the control program, an EEPROM for holding various data in a rewritable manner, and peripheral circuits. This is realized by an ECU (not shown) including an interface unit or the like that executes the control program by the CPU.

  The estimation means 102 estimates the form of collision based on the difference between a plurality of detection values at a plurality of locations respectively detected by the plurality of side collision detection sensors 101. For example, when the difference between the detection values of the plurality of side collision detection sensors 101 is equal to or greater than a predetermined amount, the estimation unit 102 estimates that the side surface of the vehicle has collided with a columnar stationary object. In addition, when the difference between the detection values is less than the predetermined amount, the estimation unit 102 estimates that the vehicle has collided with another vehicle from the side.

  FIG. 3 is an explanatory diagram showing a collision mode estimation method by the estimation unit 102. As shown in the upper part of FIG. 3A, when the side of the vehicle collides with a columnar stationary object A, an impact force is locally applied to a part of the vehicle (in the illustrated example, the front seat). Door FD area). For this reason, the magnitude of acceleration detected by each side collision detection sensor 101 varies greatly depending on the installation location. That is, the difference in acceleration detected at each location where the side collision detection sensor 101 is installed increases. More specifically, as shown in the lower graph of FIG. 3A, the detected value by the front door sensor FDS closest to the stationary object A is the largest, followed by the center pillar sensor BPS and the rear door sensor RDS. . In the lower graph of FIG. 3A, the vertical axis indicates the acceleration detected by the side collision detection sensor 101, and the horizontal axis indicates time.

  On the other hand, as shown in the upper part of FIG. 3B, when the side surface of the vehicle collides with another vehicle CR, an impact force is applied to a relatively wide range of the vehicle side surface. For this reason, the magnitude of the acceleration detected by the side collision detection sensor 101 at each installation location is a relatively close value. That is, the difference in acceleration detected at each installation location is relatively small. In the lower graph of FIG. 3 (b), the detection value by the center pillar sensor BPS is the largest, followed by the front door sensor FDS and the rear door sensor RDS in that order, but the difference is from the lower graph of FIG. 3 (a). It is getting smaller.

  For this reason, in the estimation means 102, as described above, when the difference between the plurality of detection values respectively detected by the plurality of side collision detection sensors 101 is a predetermined amount or more, the side surface of the vehicle has collided with the columnar stationary object. When the difference between the detected values is less than a predetermined amount, it is estimated that the vehicle has collided with another vehicle from the side.

  The difference between the plurality of detection values is, for example, a difference between detection values of two side collision detection sensors 101 out of the plurality of side collision detection sensors 101. In the example of the present embodiment, for example, the estimation unit 102 is configured to calculate a difference between the center pillar sensor BPS and the front door sensor FDS, a difference between the center pillar sensor BPS and the rear door sensor RDS, and a difference between the front door sensor FDS and the rear door sensor RDS. Each of these is taken, and it is determined whether or not the largest (or smallest) difference value is equal to or greater than a predetermined value.

  The difference between the plurality of detection values is, for example, the difference between the peak values of the detection values by the respective side collision detection sensors 101, the difference between the time integral values of the respective detection values, and the side collision detection by the side collision detection sensor 101 ( In the present embodiment, the difference between the detected values after the elapse of a predetermined time from the start of detection of the acceleration accompanying the side collision can be set. When estimating based on the difference of the peak value of the detection value of the side collision detection sensor 101, the magnitude of the impact caused by the collision can be easily compared. Moreover, the detection value used as a comparison object can be extracted easily. Moreover, when estimating based on the difference of the time integral value of the detection value of the side collision detection sensor 101, the form of a collision can be estimated based on the total amount of force applied to the vehicle. Further, when estimation is performed based on a difference between detection values after a predetermined time has elapsed since the side collision detection sensor 101 has started to detect a side collision, the detection result of the collision type can be quickly obtained by shortening the predetermined time. Can get to.

  FIG. 4 is a flowchart showing the procedure of the collision detection process performed by the collision detection device 100. In the flowchart of FIG. 4, the collision detection device 100 first detects acceleration by the side collision detection sensor 101 (step S <b> 401). Until any side collision detection sensor 101 detects an acceleration due to a side collision (step S402: No loop), the collision detection device 100 returns to step S401 and continues to detect the acceleration.

  When any side collision detection sensor 101 detects acceleration associated with a side collision (step S402: Yes), the collision detection device 100 causes the estimation unit 102 to calculate the difference between the detection values of the respective side collision detection sensors 101. It is calculated (step S403), and it is determined whether or not the difference is greater than or equal to a predetermined value (step S404). When the difference is equal to or greater than the predetermined value (step S404: Yes), the estimation unit 102 estimates that the side collision is a collision with a columnar stationary object (step S405), and ends the processing according to this flowchart. On the other hand, when the difference is less than the predetermined value (step S404: No), the estimation unit 102 estimates that the side collision is a collision from the side surface by another vehicle (step S406), and the processing according to this flowchart. Exit.

  The estimation result obtained by the estimation unit 102 can be used for deployment control of an occupant protection device such as an airbag. In addition to a front airbag that protects an occupant from an impact from the front, there are side airbags and curtain airbags that protect the occupant from an impact from the side. For example, when the collision type is a side collision caused by another vehicle, there is a high possibility that the lower part of the body such as the abdomen or waist of the occupant will receive an impact. It is considered effective for protection. On the other hand, when the collision is a collision with a columnar stationary object, it is highly likely that the upper part of the body such as the head or shoulder of the occupant will be impacted. It is considered effective for protection. As described above, the risk of injury to the occupant can be more appropriately reduced by appropriately using the side airbag and the curtain airbag according to the form of the collision.

  Moreover, you may make it transmit the estimation result by the estimation means 102 to an ambulance (emergency vehicle) etc., for example. Thereby, the injury state of the passenger can be predicted in advance on the ambulance side, and appropriate measures can be quickly taken.

  As described above, in the collision detection device 100 according to the embodiment, the collision mode is estimated based on the difference between the plurality of detection values respectively detected by the plurality of side collision detection sensors 101, so that the configuration is simple. The form of vehicle collision can be detected. Further, in the collision detection device 100, the side collision detection sensor 101 is provided at a position that substantially covers the occupant riding position, so that it is possible to easily estimate the form of the collision and to estimate the influence of the collision on the occupant. Can be easier.

  In the present embodiment, as a form of the collision, a collision from the side surface by another vehicle, a collision to a columnar stationary object such as a standing tree or a utility pole on the side surface of the vehicle is cited, but in other forms, It is possible to discriminate using the characteristic of the detection value of the collision detection sensor 101.

  DESCRIPTION OF SYMBOLS 100 ... Collision detection apparatus, 101 ... Side collision detection sensor, 102 ... Estimation means, 200 ... Vehicle, BP ... Center pillar, BPS ... Center pillar sensor, FD ... Front seat door, FDS ... ... front door sensor, RD ... rear seat door, RDS ... rear door sensor.

Claims (3)

A collision detection device that detects the form of the collision at the time of a side collision of the vehicle,
A plurality of side collision detection sensors respectively provided at a plurality of predetermined locations on the side surface of the vehicle;
An estimation means for estimating the form of the collision based on the difference between a plurality of detection values respectively detected by the plurality of side collision detection sensors ,
The estimation means performs the estimation based on a difference between the detection values after a predetermined time has elapsed since the side collision detection sensor began to detect the side collision.
Collision detection and wherein the this.   The estimation means estimates that the side surface of the vehicle has collided with a columnar stationary object when the difference between the detection values is equal to or greater than a predetermined amount, and if the difference between the detection values is less than the predetermined amount, the vehicle The collision detection apparatus according to claim 1, wherein the collision detection apparatus estimates that the vehicle has collided with another vehicle from the side. The side collision detection sensor includes at least two of a front seat door of the vehicle, a rear seat door of the vehicle, and a pillar between the front seat door and the rear seat door. collision detecting apparatus according to claim 1 or 2, characterized in that provided in the above places.

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