JP4394502B2 - Vehicle collision object judgment device - Google Patents

Description

  The present invention relates to a collision object determination device for a vehicle that determines a collision of an obstacle such as a pedestrian.

  In recent years, various safety measures have been taken for vehicles, including the interior space, and recently, when there is a collision with a pedestrian, this pedestrian is effectively protected. Equipment to do is beginning to be proposed. In such pedestrian safety equipment, it is first required to accurately determine that the collided object is a pedestrian.

For example, in Japanese Patent Application Laid-Open No. 2002-127867, a plurality of acceleration sensors are provided in the vehicle width direction on the inner surface of a bumper face of a front bumper, and an obstacle is determined by processing signals from these acceleration sensors by a control unit. Technology is disclosed. Specifically, the ratio of the maximum deformation amount to the maximum deformation speed is smaller for lighter obstacles than for specific obstacles such as pedestrians. The control process is performed by the control unit. In other words, when the acceleration exceeds a certain threshold value, a timed timer is generated, and further, after the deformation speed exceeds the certain threshold value and exceeds the maximum value, a gate is generated from the time when the speed falls below the threshold value until the above timer time is reached. . During this time, a signal in a state where the displacement is within a certain width is generated, a signal is generated from an AND condition of this signal and the above-described gate, and a pedestrian collision is determined based on this signal. It has become.
JP 2002-127867 A

  However, in the technique disclosed in Patent Document 1 described above, the threshold value used for determination is determined by the absolute value of the deformation speed and the deformation amount, and thus there is a problem that it is easily affected by changes in the collision speed. In addition, since multiple calculation elements such as a timer are required and the calculation is complicated, the setting of the threshold necessary for control also becomes complicated, and whenever the specifications of the front bumper of the vehicle are changed, A control change is also required. Furthermore, since a determination is made using a timer for a phenomenon in which the generation time varies depending on the collision speed, there is a problem that the detection time is delayed or the detection accuracy is deteriorated depending on the collision speed.

  The present invention has been made in view of the above circumstances, and with a small number of calculations, it is possible to reliably determine a pedestrian's collision without delay in detection time at any collision speed, such as various front bumpers, etc. An object of the present invention is to provide a vehicle collision object determination device capable of quickly responding to changes in specifications.

The present invention relates to a deformation speed calculating means for calculating a deformation speed of a collision site of a vehicle, and a deformation amount for calculating a deformation amount of an initial deformation from a preset reference value of the deformation speed of the collision site based on the deformation speed. arithmetic means, a deformation return amount calculating means for calculating a return amount of deformation after the initial deformation on the basis of the deformation speed of deformation return amount, to the collision site in accordance with the ratio of the deformation return amount with respect to the amount of deformation A collision object determination means for determining a collision object is provided.

  The collision object determination device for a vehicle according to the present invention can reliably determine a pedestrian's collision without any delay in detection time at any collision speed with few computations, and can change specifications of various front bumpers and the like. Even if there is, it is possible to respond quickly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 10 show an embodiment of the present invention, FIG. 1 is a structural view of a front bumper portion of a vehicle, FIG. 2 is a plan view showing a mounting position of an acceleration sensor, and FIG. 3 is a sectional view taken along line III-III in FIG. 4 is a functional block diagram of the collision object determination device, FIG. 5 is a flowchart of a main determination process routine, FIG. 6 is a time chart for explaining an example of the main determination process, and FIG. 7 is a safety determination process routine (1). FIG. 8 is a flowchart of the safety judgment processing routine (2), FIG. 9 is a flowchart of the safety judgment processing routine (3), and FIG. 10 is a flowchart of the safety judgment processing routine (4).

  In FIG. 1, reference numeral 1 denotes a vehicle, and a front bumper 3 is provided below the front hood 2 of the vehicle 1. The front bumper 3 includes a resin bumper face 4 that forms an exterior, and an aluminum alloy bumper beam 5 that is hollow inside and extends in the vehicle width direction. The bumper beam 5 is fixedly attached to a vehicle body frame (not shown), and is designed in shape and strength so that it rebounds in the direction in which the shape returns due to elasticity when it collides with a pedestrian.

  An impact absorbing member 6 is interposed between the bumper beam 5 and the bumper face 4. A lower reinforcing member 7 extends in the vehicle width direction below the impact absorbing member 6. ing.

  As shown in FIG. 2, the position R1 (for example, the position 200 mm on the right side from the vehicle center position) and the position L1 (for example, the position 200 mm on the left side from the vehicle center position) on the rear surface of the bumper beam 5 are One acceleration sensor 10 and a second acceleration sensor 11 are provided. In addition, the first and second acceleration sensors 10 and 11 are provided at the position indicated by the position D in FIG. 3, that is, on the outer surface of the rear portion of the bumper beam 5 in the vertical direction.

  In the present embodiment, the case of two acceleration sensors, ie, the first and second acceleration sensors 10 and 11, has been described. However, it is only necessary to have a plurality of acceleration sensors. In this case, for example, 3 In the case of using two acceleration sensors, in the vehicle width direction, the position Ce (vehicle center position), the position R2 (for example, the position 400 mm on the right side from the vehicle center position), and the position L2 (for example, the position 400 mm on the left side from the vehicle center position) are shown. (Position) may be provided. For example, when four acceleration sensors are used, they may be provided at positions R1, R2, L1, and L2 in the vehicle width direction. That is, an acceleration sensor may be provided at the left and right target positions with reference to the vehicle center.

  In the present embodiment, the first and second acceleration sensors 10 and 11 are provided at the position D in FIG. 3, that is, on the outer surface of the rear part of the bumper beam 5. You may make it provide in locations other than the site | part which opposes a front part, ie, the position except the inner surface and outer surface of the front part in the bumper beam 5. FIG. For example, it is provided at any one of position A (upper outer surface), position B (upper inner surface), position C (rear inner surface), position E (lower inner surface), and position F (lower outer surface) in FIG.

Then, as shown in FIG. 4, the first and second acceleration sensors 10 and 11 are each connected to the collision object determining section 20 receives the acceleration signals of the bumper beam 5 to the collision object determining section 20, deformation pressure It constitutes speed detection means.

  The collision object determination unit 20 mainly includes a main determination selection unit 21, a main determination processing unit 22, a safety determination processing unit 23, and a determination output unit 24.

  The main determination / selection unit 21 inputs acceleration signals from the first and second acceleration sensors 10 and 11, respectively, compares these accelerations, and selects the acceleration sensor that outputs the larger acceleration as the main. The signal is selected as a signal to be processed by the determination processing unit 22 (for example, the sensor that has reached the acceleration threshold that has been obtained in advance through experiments, calculations, or the like is selected) and output to the main determination processing unit 22. This is because the signal from the sensor provided on the collision side becomes large especially in the case of an offset collision or an oblique collision. Further, the acceleration sensor that outputs the smaller acceleration is selected as a signal to be processed by the safety determination processing unit 23, and is output to the safety determination processing unit 23.

  In the present embodiment, the acceleration is compared and a signal used in the main determination processing unit 22 or a signal used in the safety determination processing unit 23 is selected. May be selected by comparing their sizes. In this case, the acceleration sensor that outputs the larger speed is selected as a signal to be processed by the main determination processing unit 22 (for example, the speed threshold Vc1 previously obtained by experiment, calculation, etc. (FIG. 6A )) Is selected first) and output to the main determination processing unit 22, and the acceleration sensor that outputs the smaller speed is processed by the safety determination processing unit 23. And output to the safety judgment processing unit 23. This is also because the signal from the sensor provided on the collision side becomes large, especially in the case of an offset collision or an oblique collision.

  In the case of three or more acceleration sensors, the sensor with the highest acceleration or the sensor with the highest speed is selected as the sensor used in the main determination processing unit 22. Then, a sensor adjacent to the sensor used in the main determination processing unit 22 is selected as a sensor used in the safety determination processing unit 23.

  That is, the main determination selection unit 21 is provided as selection means.

  The main determination processing unit 22 reads a signal from the acceleration sensor selected by the main determination selection unit 21 and determines whether or not the collision object is a pedestrian (ON determination) according to a main determination processing routine described later. . Then, a determination signal by the main determination processing unit 22 is output to the determination output unit 24.

  That is, as shown in the flowchart of FIG. 5, first, in step (hereinafter abbreviated as “S”) 101, the acceleration G from the acceleration sensor is read, and this value is integrated and calculated as the deformation speed V of the bumper beam 5. .

  Next, in S102, the deformation speed V is compared with the first speed threshold value V1 set in advance by experiment, calculation, etc., and when the deformation speed V is lower than the first speed threshold value V1, the routine is directly exited. (Corresponding to times ta1 to ta2 in FIG. 6A).

  As a result of the determination in S102, when the deformation speed V becomes equal to or higher than the first speed threshold value V1, the process proceeds to S103, and the deformation speed V is compared with the second speed threshold value V2 set in advance through experiments, calculations, and the like.

  If the deformation speed V is higher than the second speed threshold value V2 as a result of the determination in S103, the process proceeds to S104, where the acceleration G from the acceleration sensor is newly read, and this value is integrated to obtain the bumper beam 5 The deformation speed V is calculated, and the process proceeds to S105.

  In S105, the deformation speed V is compared with the first speed threshold V1, and if the deformation speed V is not equal to or less than the first speed threshold V1, the process returns to S104, and the deformation speed V is equal to or less than the first speed threshold V1. If so, exit the routine. That is, in the case of a collision with a pedestrian, the amount of displacement in the repulsion direction relative to the amount of displacement in the deformation direction increases. However, in a collision with a heavy object, as shown in FIG. 6B, the deformation speed is deformed exceeding the second speed threshold value V2 (time tb2). In such a case, it is not determined as a pedestrian. It is like that.

  On the other hand, if the deformation speed V is equal to or less than the second speed threshold value V2 in S103 described above, the process proceeds to S106, where the deformation speed V is a deformation speed reference value V3 (for example, 0 km / h) set in advance through experiments, calculations, and the like. It is determined whether or not.

  As a result of the determination in S106, if the deformation speed V is higher than the reference value V3, the process proceeds to S107, and the acceleration G from the acceleration sensor is newly read, and this value is integrated to calculate the deformation speed V of the bumper beam 5. Then, the process returns to S103 (corresponding to times ta2 to ta3 in FIG. 6A).

  If the result of determination in S106 is that the deformation speed V is less than or equal to the reference value V3, the process proceeds to S108, where the deformation speed V is integrated and the deformation amount D1 is calculated.

  Next, in S109, the acceleration G from the acceleration sensor is newly read, and this value is integrated to calculate the deformation speed V of the bumper beam 5, and the process proceeds to S110, where the current deformation speed reference value V3 is obtained. The deformation return amount, that is, the deformation return amount D2 is calculated by integration, and the process proceeds to S111.

  In S111, the ratio (| D2 | / D1) of the deformation return amount D2 to the deformation amount D1 is compared with a first ratio threshold value Th1 set in advance through experiments, calculations, and the like.

  If the ratio (| D2 | / D1) of the deformation return amount D2 to the deformation amount D1 is smaller than the first ratio threshold value Th1 as a result of the comparison in S111, the process proceeds to S112, and the deformation speed V becomes higher than the reference value V3. When the deformation speed V becomes higher than the reference value V3, the routine is exited to finish the calculation of the deformation return amount D2. Conversely, when the deformation speed V is lower than the reference value V3, the process returns to S109.

  If the ratio (| D2 | / D1) of the deformation return amount D2 to the deformation amount D1 is equal to or greater than the first ratio threshold value Th1 as a result of the comparison in S111, the process proceeds to S113 to determine ON (impact target) The object is determined to be a pedestrian and the routine is exited.

  That is, in the case of a collision with a pedestrian, as shown in FIG. 6, the ratio (| D2 | / D1) of the deformation return amount D2 to the deformation amount D1 increases. On the other hand, in a collision with a heavy object, even if the deformation speed V exceeds the second speed threshold value V2, the deformation return amount D2 does not appear (does not fall below the reference value V3), or the deformation speed V falls below the reference value V3. Even if the amount D1 is large and takes a ratio with the deformation return amount D2, the value becomes very small. Therefore, by recognizing this difference, a collision with a pedestrian is reliably determined.

  In the present embodiment, the main determination processing unit 22 does not directly use the absolute values of the deformation speed V, the deformation amount D1, and the deformation return amount D2 in the determination value for determining the collision with the pedestrian. Since the determination is made using the ratio of the deformation return amount D2 to the amount D1 (| D2 | / D1), it is not affected by the change in the collision speed, and the response can be made accurately at any collision speed. A collision with a pedestrian can be determined well.

  Further, since the calculation can be performed by simply obtaining the ratio (| D2 | / D1) of the deformation return amount D2 to the deformation amount D1, and comparing this with the first ratio threshold value Th1, the calculation amount and the calculation element Can be reduced. For this reason, the threshold value to be set can be reduced, and it is possible to quickly cope with changes in specifications of various front bumpers and the like.

As described above, the main determination process section 22 has a function as a deformation speed calculating means, deformation amount calculation means, deformation return amount calculating means also functions as a collision object determining means.

  The safety judgment processing unit 23 reads a signal from the acceleration sensor selected by the main judgment selection unit 21, and in the present embodiment, the main judgment processing unit 22 performs the safety judgment processing routine (1) described later. Whether to output the determination result is determined. That is, the determination result is ON when the output of the determination result is permitted. The determination signal of the safety determination processing unit 23 is output to the determination output unit 24.

  The determination output unit 24 receives signals from the main determination processing unit 22 and the safety determination processing unit 23. And when the signal from the main determination process part 22 and the safety determination process part 23 is both ON determination, it determines with a collision with a pedestrian and outputs a signal. In other words, the safety judgment processing unit 23 and the judgment output unit 24 constitute a confirmation unit.

  Next, the safety determination processing routine (1) executed by the safety determination processing unit 23 will be described with reference to the flowchart of FIG.

  First, in S201, the acceleration G from the acceleration sensor is read, and this value is integrated and calculated as the deformation speed V of the bumper beam 5.

  Next, in S202, the deformation speed V is compared with a third speed threshold value Vs4 set in advance through experiments, calculations, and the like. If the deformation speed V is lower than the third speed threshold value Vs4, the routine is directly exited. . Conversely, if the deformation speed V is greater than or equal to the third speed threshold Vs4, the process proceeds to S203, and the routine exits from the routine as ON determination in order to permit output of the determination result in the main determination processing unit 22. Thus, the accuracy of determination is improved by having the confirmation processing by the safety determination processing unit 23.

  In the case of having a plurality of acceleration sensors, it is ON when all the deformation speeds V by the sensors adjacent to the sensor that performs the main determination process are equal to or higher than the fourth speed threshold value set in advance through experiments, calculations, etc. A determination may be made. Of course, it may be turned on when one of the adjacent acceleration sensors becomes equal to or higher than the third speed threshold Vs4 set in advance by experiment, calculation, or the like. This difference is determined by how these speed thresholds are set.

  Further, the determination process of the above-described safety determination process routine (1) can be executed by the following safety determination process routine (2). In addition, this safety determination processing routine (2) executes the above-described main determination processing routine while changing each threshold value.

  That is, FIG. 8 shows a flowchart of the safety determination processing routine (2). First, the acceleration G from the acceleration sensor is read in S301, and this value is integrated and calculated as the deformation speed V of the bumper beam 5.

  Next, in S302, the deformation speed V is compared with the fifth speed threshold value Vs1 lower than the first speed threshold value V1 previously set by experiment, calculation, etc., and the deformation speed V becomes the fifth speed. If it is lower than the threshold value Vs1, the routine is exited.

  As a result of the determination in S302, when the deformation speed V becomes equal to or higher than the fifth speed threshold value Vs1, the process proceeds to S303, and the deformation speed V is lower than the second speed threshold value V2 previously set by experiment, calculation, or the like. The sixth speed threshold value Vs2 is compared.

  As a result of the determination in S303, if the deformation speed V is higher than the sixth speed threshold value Vs2, the process proceeds to S304, and the acceleration G from the acceleration sensor is newly read, and this value is integrated to obtain the bumper beam 5 The deformation speed V is calculated, and the process proceeds to S305.

  In S305, the deformation speed V is compared with the fifth speed threshold value Vs1, and if the deformation speed V is not equal to or less than the fifth speed threshold value Vs1, the process returns to S304, and the deformation speed V is equal to or less than the fifth speed threshold value Vs1. If so, exit the routine.

  On the other hand, if the deformation speed V is equal to or smaller than the sixth speed threshold value Vs2 in S303, the process proceeds to S306, where the deformation speed V is a deformation speed reference value Vs3 (for example, 0 km / h, It is determined whether the value is equal to or less than the reference value V3.

  As a result of the determination in S306, if the deformation speed V is higher than the reference value Vs3, the process proceeds to S307, where the acceleration G from the acceleration sensor is newly read, and this value is integrated to calculate the deformation speed V of the bumper beam 5. Then, the process returns to S303.

  As a result of the determination in S306, if the deformation speed V is equal to or less than the reference value Vs3, the process proceeds to S308, where the deformation speed V is integrated and the deformation amount D1 is calculated.

  Next, the process proceeds to S309, where the acceleration G from the acceleration sensor is newly read, and this value is integrated to calculate the deformation speed V of the bumper beam 5. The process proceeds to S310, and the current deformation speed reference value Vs3 is obtained. The deformation return amount, that is, the deformation return amount D2 is calculated by integration, and the process proceeds to S311.

  In S311, the ratio (| D2 | / D1) of the deformation return amount D2 with respect to the deformation amount D1 and the second ratio threshold Ths1 lower than the first ratio threshold Th1 set in advance through experiments, calculations, etc. Compare

  If the ratio (| D2 | / D1) of the deformation return amount D2 to the deformation amount D1 is smaller than the second ratio threshold value Ths1 as a result of the comparison in S311, the process proceeds to S312 and the deformation speed V becomes higher than the reference value Vs3. If the deformation speed V is higher than the reference value Vs3, the routine is exited to end the calculation of the deformation return amount D2. Conversely, when the deformation speed V is lower than the reference value Vs3, the process returns to S309.

  If the ratio (| D2 | / D1) of the deformation return amount D2 to the deformation amount D1 is equal to or greater than the second ratio threshold Ths1 as a result of the comparison in S311, the process proceeds to S313 and the main determination processing unit 22 In order to permit the output of the determination result at, the routine exits as an ON determination.

  In the case of having a plurality of acceleration sensors, the deformation return amount D2 with respect to all the deformation amounts D1 by the sensors adjacent to the sensor that performs the main determination processing, as described in the safety determination processing routine (1) above. May be determined to be ON when the ratio (| D2 | / D1) is equal to or higher than a third ratio threshold lower than the first ratio threshold Th1 set in advance by experiment, calculation, or the like. . Of course, it may be turned on when one of the adjacent acceleration sensors becomes equal to or higher than the second ratio threshold value Ths1 set in advance by experiment, calculation or the like. This difference is determined by how these ratio thresholds are set.

  Further, the determination process of the above-described safety determination process routine (1) or (2) can also be executed by the following safety determination process routine (3).

  That is, FIG. 9 shows a flowchart of the safety determination processing routine (3). First, in step S401, acceleration (as deformation acceleration) G from the acceleration sensor is read.

  Next, in S402, the deformation acceleration G is compared with the first acceleration threshold value Gs1 set in advance through experiments, calculations, and the like. If the deformation acceleration G is lower than the first acceleration threshold value Gs1, the routine is directly exited. . Conversely, if the deformation acceleration G is greater than or equal to the first acceleration threshold value Gs1, the process proceeds to S403, and the routine is exited as an ON determination to permit the output of the determination result in the main determination processing unit 22. Note that the acceleration G used for comparison in the safety judgment processing routine (3) is subjected to filter processing or the like if necessary.

  In the case of having a plurality of acceleration sensors, the deformation acceleration G by the sensor adjacent to the sensor that performs the main determination process is previously tested, calculated, etc., as described in the safety determination processing routine (1). The ON determination may be made when the second acceleration threshold or more set in step S1 is reached. Of course, it may be turned on when one of the adjacent acceleration sensors becomes equal to or higher than the first acceleration threshold Gs1 set in advance by experiment, calculation, or the like. This difference is determined by how these acceleration threshold values are set.

  Further, the above-described safety determination processing routine (1), (2) or (3) determination processing can also be executed by the following safety determination processing routine (4).

  That is, FIG. 10 shows a flowchart of the safety determination processing routine (4). First, in step S501, acceleration (as deformation acceleration) G is read from the acceleration sensor, and integration processing is performed to calculate the deformation amount D1.

  Next, the process proceeds to S502, where the deformation amount D1 is compared with the first deformation amount threshold value Ds1 set in advance by experiment, calculation, etc., and when the deformation amount D1 is lower than the first deformation amount threshold value Ds1, the routine is continued. Exit. Conversely, if the deformation amount D1 is greater than or equal to the first deformation amount threshold value Ds1, the process proceeds to S503, and the routine is exited as ON determination in order to permit the output of the determination result in the main determination processing unit 22.

  In the case of having a plurality of acceleration sensors, the deformation amount D1 by the sensor adjacent to the sensor that performs the main determination process is determined in advance by experiments, calculations, etc., as described in the safety determination processing routine (1). The ON determination may be made when the second deformation amount threshold or more set in step S1 is reached. Of course, it may be turned on when one of the adjacent acceleration sensors becomes equal to or higher than the first deformation amount threshold value Ds1 set in advance by experiment, calculation, or the like. This difference is determined by how to set these deformation amount thresholds.

  In addition, the safety determination processing unit 23 may limit the main determination process in the main determination processing unit 22 for a certain time, and may not determine the collision object when this time is exceeded. For example, after the deformation speed V exceeds (V1 / 2), a fixed time determination gate is generated, and if the process does not end within this gate, the collision object is not determined (ON determination). is there.

  Thus, according to the present embodiment, the determination accuracy can be further improved by having the safety determination processing unit 23 and the determination output unit 24. In addition, when importance is attached to the reduction of the calculation amount, and the sufficient accuracy can be obtained only by the main determination processing unit 22, the safety determination processing unit 23 and the determination output unit 24 can of course be omitted. .

Structural drawing of the front bumper part of the vehicle Plan view showing the mounting position of the acceleration sensor III-III sectional view of FIG. Functional block diagram of collision object judgment device Main determination processing routine flowchart Time chart explaining an example of main judgment processing Flow chart of safety judgment processing routine (1) Flow chart of the safety judgment processing routine (2) Flow chart of the safety judgment processing routine (3) Flow chart of the safety judgment processing routine (4)

Explanation of symbols

1 vehicle 3 front bumper 4 bumper face 5 the bumper beam 10 first acceleration sensor (deformation acceleration detecting means)
11 second acceleration sensor (deformation acceleration detecting means)
20 Collision determination unit 21 Main determination selection unit (selection means)
22 Main determination processing unit (deformation speed calculation means, deformation amount calculation means, deformation return amount calculation means, collision object determination means)
23 Safety judgment processing part (confirmation means)
24 judgment output part (confirmation means)

Claims (14)

Deformation speed calculating means for calculating the deformation speed of the collision site of the vehicle;
A deformation amount calculating means for calculating a deformation amount of the initial deformation from a reference value of a predetermined deformation speed of the collision site based on the deformation speed;
Deformation return amount calculating means for calculating the return amount of deformation after the initial deformation as a deformation return amount based on the deformation speed;
A collision object determination means for determining an object that has collided with the collision site according to a ratio of the deformation return amount to the deformation amount;
A vehicle collision object determination device comprising:   2. The collision object determination device for a vehicle according to claim 1, wherein the deformation amount calculating means calculates the deformation amount when the deformation speed exceeds a preset first speed threshold value.   3. The vehicle according to claim 2, wherein the deformation amount calculation means does not perform the calculation of the deformation amount when the deformation speed exceeds a preset second speed threshold value greater than the first speed threshold value. Collision object judgment device.   The collision object determination means determines that a specific object set in advance has collided when a ratio of the deformation return amount to the deformation amount exceeds a preset first ratio threshold value. The collision object determination device for a vehicle according to any one of claims 1 to 3.   5. The deformation speed calculating means calculates the deformation speed by integrating the deformation acceleration of the collision portion of the vehicle detected by the deformation acceleration detecting means. 6. Vehicle collision object determination device.   6. The vehicle collision object determination device according to claim 5, wherein a plurality of the deformation acceleration detecting means are provided in a vehicle width direction of a bumper beam covered in a front bumper of the vehicle. 7. The vehicle collision object determination device according to claim 6 , wherein the deformation acceleration detecting means is provided in a portion other than a portion of the bumper beam facing the front portion of the front bumper.   2. The apparatus according to claim 1, further comprising a selection unit configured to determine an object that has collided with the collision site using a value from the deformation acceleration detection unit having the highest deformation speed among the plurality of deformation acceleration detection units. The collision object determination device for a vehicle according to claim 6 or 7.   2. The apparatus according to claim 1, further comprising a selection unit configured to determine an object colliding with the collision site using a value from the deformation acceleration detection unit having the highest deformation acceleration among the plurality of deformation acceleration detection units. The collision object determination device for a vehicle according to claim 6 or 7.   When the selection means performs the determination, there is provided a confirmation means for confirming output permission of the determination result using a detection value from a deformation acceleration detection means other than the selected deformation acceleration detection means. The vehicle collision object determination device according to claim 8 or 9.   When the confirmation means makes the determination by the selection means, the deformation speed from one deformation acceleration detection means of the deformation acceleration detection means adjacent to the selected deformation acceleration detection means exceeds a preset third speed threshold. And when the deformation speed from all the deformation acceleration detection means of the adjacent deformation acceleration detection means exceeds a preset fourth speed threshold, the selection means is selected to perform the determination. The vehicle collision object determination device according to claim 10, wherein output of a determination result by the deformation acceleration detection means is permitted.   When the determination means makes the determination, the confirmation means is based on the deformation speed from one deformation acceleration detection means of the deformation acceleration detection means adjacent to the selected deformation acceleration detection means, and is the initial value from the reference value of the deformation speed. A deformation ratio of the deformation is calculated, a return amount of the deformation after the initial deformation is calculated as a deformation return amount based on the deformation speed, and a ratio of the deformation return amount to the deformation amount is set in advance as a second ratio threshold value And a deformation amount of the initial deformation from the reference value of the deformation speed based on the respective deformation speeds from all the deformation acceleration detection means of the adjacent deformation acceleration detection means, respectively, Based on the deformation speed, a return amount of deformation after the initial deformation is calculated as a deformation return amount, and a ratio of the deformation return amount to the deformation amount is set in advance as a third ratio threshold value. 11. The collision object determination device for a vehicle according to claim 10, wherein if the determination is made by the selection means in any case of exceeding, the output of the determination result by the selected deformation acceleration detection means is permitted. .   When the determination means makes the determination by the selection means, the deformation acceleration by one deformation acceleration detection means of the deformation acceleration detection means adjacent to the selected deformation acceleration detection means exceeds a preset first acceleration threshold value. The selected deformation acceleration is determined by the selection means when the deformation acceleration by all the deformation acceleration detection means of the adjacent deformation acceleration detection means exceeds a preset second acceleration threshold value. 11. The collision object determination device for a vehicle according to claim 10, wherein output of the determination result by the detection means is permitted.   When the determination means makes the determination, the confirmation means is based on the deformation speed from one deformation acceleration detection means of the deformation acceleration detection means adjacent to the selected deformation acceleration detection means, and is the initial value from the reference value of the deformation speed. When the deformation amount of the deformation is calculated and the deformation amount exceeds a preset first deformation amount threshold value, and based on the respective deformation speeds from all the deformation acceleration detection means of the adjacent deformation acceleration detection means. When the deformation amount of the initial deformation from the reference value of the deformation speed is calculated and all of these deformation amounts exceed the preset second deformation amount threshold value, the determination by the selection means is performed. 11. The collision object determination device for a vehicle according to claim 10, wherein when it is performed, output of a determination result by the selected deformation acceleration detecting means is permitted.

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