JP2011173452A - Collision detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collision detection device capable of properly deciding a vehicle collision, even when a tire is punctured. <P>SOLUTION: An airbag device includes a puncture detecting part B1, a filter part B2 and a collision deciding part B3. When the puncture detecting part B1 detects the puncture of the tire, the filter part B2 outputs detection results of satellite sensors 101 to 106 and a center sensor 100a by reducing specified signals caused by the puncture of the tire from the detection results. The collision deciding part B3 compares the detection results of the satellite sensors 101 to 106 and the center sensor 100a inputted from the filter part B2 with a decision threshold for each sensor to decide the vehicle collision. The vehicle collision therefore can be properly decided without being affected by the specified signals caused by the puncture, even when the tire is punctured. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a collision detection apparatus including an impact detection unit that detects an impact applied to a vehicle, and a collision determination unit that determines a vehicle collision based on a detection result of the impact detection unit.

  Conventionally, for example, Patent Document 1 discloses a collision detection apparatus including an impact detection unit that detects an impact applied to a vehicle and a collision determination unit that determines a vehicle collision based on a detection result of the impact detection unit. There is a vehicle occupant protection device. This vehicle occupant protection device includes a plurality of acceleration sensors and a control device. The acceleration sensor is disposed in each part of the vehicle and detects an impact applied to the vehicle. The control device determines a vehicle collision based on the detection result of the acceleration sensor, and controls activation of the corresponding airbag and pretensioner.

JP 2009-196589 A

  By the way, when the tire of the vehicle is punctured, the impact caused by the puncture is repeatedly applied to the vehicle. Therefore, a specific signal generated due to puncture is superimposed on the detection result of the acceleration sensor. If an attempt is made to determine a vehicle collision in such a state, there is a possibility that the vehicle collision cannot be appropriately determined by a specific signal generated due to puncture.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a collision detection device that can appropriately determine a vehicle collision even when a tire is punctured.

  Therefore, the present inventor has intensively studied to solve this problem, and as a result of repeated trial and error, when the vehicle tire punctures, a specific signal generated due to the puncture generated in the detection result of the impact detection means By providing the filter means for reducing the above, it has been conceived that even when the tire is punctured, a vehicle collision can be properly determined, and the present invention has been completed.

  In other words, the collision detection apparatus according to claim 1 includes an impact detection unit that detects an impact applied to the vehicle, and a collision determination unit that determines a vehicle collision based on a detection result of the impact detection unit. And a filter means for subtracting a specific signal caused by tire puncture from the detection result of the impact detection means input to the collision determination means when the vehicle tire is punctured. According to this configuration, when the tire of the vehicle is punctured, subsequently, the impact associated with the puncture is repeatedly applied to the vehicle. Therefore, a specific signal generated due to puncture is superimposed on the detection result of the impact detection means. However, the filter means reduces the specific signal generated due to tire punctures. Therefore, even when the tire is punctured, it is possible to appropriately determine the vehicle collision without being affected by a specific signal generated due to the puncture.

  In the collision detection device according to claim 2, the collision determination unit determines a vehicle collision by comparing a detection result of the impact detection unit with a determination threshold for the impact detection unit. The threshold value is changed in a direction in which it is difficult to determine that the vehicle has collided. According to this configuration, when the tire is punctured, the collision determination unit changes the determination threshold in a direction in which it is difficult to determine that the vehicle has collided. Therefore, it is possible to suppress erroneous determination due to the influence of a specific signal generated due to puncture. Therefore, the vehicle collision can be determined more appropriately.

  In the collision detection device according to claim 3, the impact detection means is disposed at least one of the front, rear and side of the vehicle, and is disposed at a satellite sensor for detecting an impact applied to the vehicle, and at the center of the vehicle. A collision detection means for comparing the detection result of the satellite sensor with a determination threshold value for the satellite sensor and comparing the detection result of the center sensor with a determination threshold value for the center sensor. When the vehicle crash is determined and the tire is punctured, the determination threshold for the satellite sensor is changed in a direction that makes it difficult to determine that the vehicle has crashed, and the determination threshold for the center sensor is changed in a direction that makes it easier to determine that the vehicle has crashed. It is characterized by making it. According to this configuration, the satellite sensor is disposed on at least one of the front side, the rear side, and the side of the vehicle, which is susceptible to an impact caused by puncture. On the other hand, the center sensor is arranged at the center of the vehicle, which is less susceptible to the impact caused by the puncture than the satellite sensor. When the tire is punctured, the determination threshold value for the satellite sensor that is easily affected by the puncture is changed in a direction in which it is difficult to determine that the vehicle has collided. Therefore, it is possible to suppress erroneous determination due to the influence of a specific signal generated due to puncture. Furthermore, the determination threshold value for the center sensor which is not easily affected by the puncture is changed in a direction in which it is easy to determine that the vehicle has collided. Therefore, it is possible to determine a vehicle collision at an early stage while suppressing the influence of a specific signal generated due to puncture. Therefore, the vehicle collision can be determined more appropriately.

  The collision detection device according to claim 4 includes puncture detection means for detecting tire punctures, and the filter means is a specification generated due to tire punctures when the puncture detection means detects tire punctures. It is characterized by reducing the signal. According to this configuration, the tire puncture can be reliably detected by the puncture detection means. Therefore, when the tire is punctured, a specific signal generated due to the puncture can be surely reduced.

  The collision detection apparatus according to claim 5 is characterized in that the puncture detection means detects tire puncture based on the detection result of the impact detection means. According to this configuration, the puncture detection means detects tire punctures using the detection result of the impact detection means. Therefore, the configuration can be simplified.

  The collision detection apparatus according to claim 6 is characterized in that the puncture detecting means detects tire puncture based on a signal having periodicity corresponding to the vehicle speed generated in the detection result of the impact detecting means. According to this configuration, tire puncture can be reliably detected.

  The collision detection device according to claim 7 is characterized in that the puncture detecting means includes an air pressure sensor for detecting tire air pressure, and detects tire puncture based on a detection result of the air pressure sensor. According to this configuration, an air pressure sensor is required, but tire puncture can be detected more reliably.

  The collision detection device according to claim 8 is characterized in that the filter means reduces a signal having periodicity according to the vehicle speed. According to this configuration, when the tire is punctured, subsequently, the impact associated with the puncture is repeatedly applied to the vehicle. Therefore, a signal having periodicity according to the vehicle speed, which is a specific signal generated due to puncture, is superimposed on the detection result of the impact detection means. However, the filter means reduces the signal having periodicity according to the vehicle speed. Therefore, even when the tire is punctured, it is possible to appropriately determine a vehicle collision without being affected by a signal having a periodicity corresponding to the vehicle speed, which is generated due to the puncture.

  The collision detection device according to claim 9 is characterized in that the impact detection means is an acceleration sensor for detecting an acceleration applied to the vehicle. According to this configuration, it is possible to reliably detect the impact applied by the vehicle.

  A collision detection device according to a tenth aspect is used for an occupant protection device that protects an occupant of a vehicle at the time of a vehicle collision. According to this configuration, in the occupant protection device that protects the occupant of the vehicle at the time of the vehicle collision, even if the tire is punctured, the vehicle collision is not affected by the specific signal generated due to the puncture. It can be judged appropriately.

It is a typical top view showing the whole air bag device composition in a 1st embodiment. It is a block diagram of airbag ECU. It is a block diagram relevant to determination of the vehicle collision of a microcomputer. It is a graph which shows the detection result of a satellite sensor and a center sensor before and after puncture generation. It is a graph for demonstrating operation | movement of a puncture detection part. It is a graph for demonstrating operation | movement of a filter part.

  Next, an embodiment is given and this invention is demonstrated in detail. In the present embodiment, an example is shown in which the collision detection device according to the present invention is applied to an airbag device that protects a vehicle occupant.

(First embodiment)
First, the configuration of the airbag device will be described with reference to FIG. Here, FIG. 1 is a schematic plan view showing the overall configuration of the airbag apparatus in the first embodiment. In addition, the front-back direction and the left-right direction in a figure show the front-back direction and the left-right direction of a vehicle.

  As shown in FIG. 1, the airbag device 1 (collision detection device, occupant protection device) includes an airbag ECU 100, satellite sensors 101 to 106 (impact detection means), a driver-side front airbag 107, and a passenger seat. A front airbag 108, side airbags 109 and 110, and curtain airbags 111 and 112 are provided.

  The airbag ECU 100 is a driver's seat front based on the impact applied to the vehicle detected by a center sensor 100 (impact detection means), which will be described later, and the impact applied to the vehicle detected by the satellite sensors 101-106. This is an apparatus for deploying the airbag 107, the front airbag 108 for the passenger seat, the side airbags 109 and 110, and the curtain airbags 111 and 112. The airbag ECU 100 is disposed at the center of the vehicle.

  The satellite sensors 101 to 106 are sensors that detect an impact applied to each part of the vehicle and transmit detection results via the communication buses 113 to 116 in response to a data transmission request from the airbag ECU 100. Specifically, it is an acceleration sensor that detects acceleration applied to the vehicle. The satellite sensor 101 is an acceleration sensor that detects acceleration in the front-rear direction of the vehicle, and is disposed on the right front portion of the vehicle. The satellite sensors 102 and 103 are acceleration sensors that detect the acceleration in the left-right direction of the vehicle, and are disposed near the C pillar and the B pillar on the right side of the vehicle, respectively. The satellite sensor 101 is connected to the airbag ECU 100 via the communication bus 113. The satellite sensors 102 and 103 are connected to the airbag ECU 100 via the communication bus 114. The satellite sensor 104 is an acceleration sensor that detects acceleration in the front-rear direction of the vehicle, and is disposed on the left front portion of the vehicle. The satellite sensors 105 and 106 are acceleration sensors that detect the acceleration in the left-right direction of the vehicle, and are arranged near the C pillar and the B pillar on the left side of the vehicle, respectively. The satellite sensor 104 is connected to the airbag ECU 100 via the communication bus 1115. The satellite sensors 105 and 106 are connected to the airbag ECU 100 via the communication bus 116.

  Next, the configuration of the airbag ECU will be described with reference to FIG. Here, FIG. 2 is a block diagram of the airbag ECU.

  As shown in FIG. 2, the airbag ECU 100 includes a center sensor 100a, a communication circuit 100b, an ignition circuit 100c, and a microcomputer 100d.

  The center sensor 100a is a sensor that is disposed inside the airbag ECU 100 and detects an impact applied to the vehicle. Specifically, it is an acceleration sensor that detects acceleration in the longitudinal direction of the vehicle.

  The communication circuit 100b is a circuit that converts the detection results transmitted from the satellite sensors 101 to 106 via the communication buses 113 to 116 into a predetermined format and outputs the result to the microcomputer 100d. The communication circuit 100b is connected to the satellite sensors 101 to 106 via the communication buses 113 to 116. Further, it is connected to the microcomputer 100d.

  The ignition circuit 100c is a circuit that activates a corresponding airbag based on an ignition signal input from the microcomputer 100d.

  The microcomputer 100d determines a collision with the vehicle based on the detection results of the satellite sensors 101 to 106 input via the communication circuit 100b and the detection result input from the center sensor 100a, and activates the corresponding airbag. This is an element that outputs an ignition signal to the ignition circuit 100c. The microcomputer 100d is connected to the center sensor 100a. Further, it is connected to the communication circuit 100b. Furthermore, it is connected to the ignition circuit 100c.

  Next, the microcomputer will be described with reference to FIGS. Here, FIG. 3 is a block diagram related to determination of a vehicle collision by the microcomputer. FIG. 4 is a graph showing detection results of the satellite sensor and the center sensor before and after the occurrence of puncture. FIG. 5 is a graph for explaining the operation of the puncture detection unit. FIG. 6 is a graph for explaining the operation of the filter unit.

  As shown in FIG. 3, the microcomputer 100d includes, as blocks related to vehicle collision determination, a puncture detection unit B1 (puncture detection unit), a filter unit B2 (filter unit), and a collision determination unit B3 (collision determination unit). ).

  The puncture detection unit B1 is a block that detects tire punctures based on the detection results of the satellite sensors 101 to 106 input from the communication circuit 100b and the detection result of the center sensor 100a. When the tire is punctured, the impact associated with puncture is repeatedly applied to the vehicle. Therefore, as shown in FIG. 4, after the tire is punctured, a pulse signal having periodicity corresponding to the vehicle speed is superimposed on the detection results of the satellite sensors 101 to 106 and the center sensor 100a. The puncture detection unit B1 detects tire puncture based on a pulse-shaped signal having periodicity corresponding to the vehicle speed, which is generated in the detection results of the satellite sensors 101 to 106 and the center sensor 100a. Specifically, as shown in FIG. 5, at least one of the detection results of the satellites 101 to 106 and the center sensor 100a, a pulse-like signal having a periodicity corresponding to the vehicle speed and a predetermined level or higher is continued for a predetermined time. It is determined that the tire is punctured.

  The filter unit B2 shown in FIG. 3 subtracts a specific signal caused by tire puncture from the detection results of the satellite sensors 101 to 106 and the detection result of the center sensor 100a input from the communication circuit 100b, and outputs the result. It is a block to do. When the puncture detection unit B1 does not detect tire puncture, the filter unit B2 outputs the detection results of the satellite sensors 101 to 106 and the center sensor 100a as they are. On the other hand, when the puncture detection unit B1 detects a tire puncture, a specific signal generated due to the tire puncture is subtracted from the detection results of the satellite sensors 101 to 106 and the center sensor 100a and output. Specifically, as shown in FIG. 6, a pulse-like signal having periodicity according to the vehicle speed after detecting tire puncture, which is superimposed on the detection results of the satellite sensors 101 to 106 and the center sensor 100a. Is output.

  The collision determination unit B3 determines the vehicle collision by comparing the detection results of the satellite sensors 101 to 106 and the center sensor 100a input from the filter unit B2 with the determination threshold for each sensor, and activates the corresponding airbag. This is a block for outputting an ignition signal for the purpose. When the puncture detection unit B1 does not detect tire punctures, the collision determination unit B3 compares the detection results of the satellite sensors 101 to 106 and the center sensor 100a with respective determination threshold values set in advance. Determine. Specifically, when the detection result exceeds the determination threshold, it is determined that a collision has occurred at a predetermined location of the vehicle. On the other hand, when the puncture detection unit B1 detects tire puncture, the determination threshold for each sensor is changed in a direction in which it is difficult to determine that the vehicle has collided. Specifically, the determination threshold value is increased. Then, the vehicle collision is determined by comparing the detection results of the satellite sensors 101 to 106 and the center sensor 100a with changed determination thresholds for the respective sensors.

  Next, the operation of the vehicle occupant protection device will be described with reference to FIGS. For example, in FIG. 1, when a vehicle collision occurs, an impact is applied to the vehicle, and acceleration is generated accordingly. This acceleration is detected by the satellite sensors 101-106. Further, it is detected by a center sensor 100a inside the airbag ECU 100. The detection results of the satellite sensors 101 to 106 are transmitted to the airbag ECU 100 via the communication buses 113 to 116. The transmitted detection result is converted into a predetermined format by the communication circuit 100b and input to the microcomputer 100d. The detection result of the center sensor 100a is also input to the microcomputer 100d.

  When the tire of the vehicle is not punctured, a pulse-like signal having periodicity corresponding to the vehicle speed, which is caused by tire puncture, is superimposed on the detection results of the satellite sensors 101 to 106 and the center sensor 100a. There is no. Therefore, the puncture detection unit B1 illustrated in FIG. 3 determines that the tire is not punctured. Since the puncture detection unit B1 does not detect tire punctures, the filter unit B2 outputs the input detection results of the satellite sensors 101 to 106 and the center sensor 100a as they are.

  The collision determination unit B3 compares the input detection results of the satellite sensors 101 to 106 and the center sensor 100a with determination thresholds for the respective sensors. When the detection results of the satellite sensors 101 to 106 and the center sensor 100a exceed the determination thresholds for the respective sensors, it is determined that a collision has occurred at a predetermined location of the vehicle, and an ignition signal for starting the corresponding airbag Is output. When the ignition signal is input, the ignition circuit 100c shown in FIG. 2 activates the corresponding airbag based on the ignition signal. Thus, the occupant is protected by the airbag.

  On the other hand, when the tire of the vehicle is punctured, the impact caused by the puncture is repeatedly applied to the vehicle, and acceleration is accordingly generated. Therefore, as shown in FIG. 4, after the tire is punctured, a pulse signal having periodicity corresponding to the vehicle speed is superimposed on the detection results of the satellite sensors 101 to 106 and the center sensor 100a.

  As shown in FIG. 5, the puncture detection unit B1 shown in FIG. 3 continues with a pulse-shaped signal having a periodicity corresponding to the vehicle speed at a predetermined level or more in the detection results of the satellites 101 to 106 and the center sensor 100a for a predetermined time. Therefore, it is determined that the tire is punctured. When the puncture detection unit B1 detects a tire puncture, the filter unit B2 detects a tire puncture superimposed on the input detection results of the satellite sensors 101 to 106 and the center sensor 100a as shown in FIG. Subsequent pulse signals having periodicity corresponding to the vehicle speed are reduced and output.

  The collision determination unit B3 increases the determination threshold for each sensor, and compares the input detection results of the satellite sensors 101 to 106 and the center sensor 100a with the changed determination threshold. When the input detection results of the satellite sensors 101 to 106 and the center sensor 100a exceed the changed determination threshold for each sensor, it is determined that a collision has occurred at a predetermined location of the vehicle, and the corresponding airbag is An ignition signal for starting is output.

  Next, the effect will be described. According to the first embodiment, the filter unit B2 reduces a signal having a periodicity corresponding to the vehicle speed, which is a specific signal generated due to tire puncture. Therefore, in an airbag device that protects a vehicle occupant at the time of a vehicle collision, even when a tire is punctured, it is not affected by a signal having periodicity according to the vehicle speed, which is caused by puncture, A vehicle collision can be appropriately determined.

  According to the first embodiment, when the tire is punctured, the collision determination unit B3 changes the determination threshold in a direction in which it is difficult to determine that the vehicle has collided. Specifically, the determination threshold value is increased. Therefore, it is possible to suppress erroneous determination caused by the influence of a signal having periodicity corresponding to the vehicle speed, which is caused by puncture. Therefore, the vehicle collision can be determined more appropriately.

  According to the first embodiment, the puncture of the tire can be reliably detected by the puncture detection unit B1. Therefore, when the tire is punctured, a signal having periodicity corresponding to the vehicle speed, which is generated due to the puncture, can be surely reduced.

  According to the first embodiment, the puncture detection unit B1 detects tire punctures using the detection results of the satellite sensors 101 to 106 and the center sensor 100a. Therefore, the configuration can be simplified.

  According to the first embodiment, the puncture detection unit B1 detects tire puncture using a signal having periodicity corresponding to the vehicle speed generated in the detection results of the satellite sensors 101 to 106 and the center sensor 100a. Therefore, tire puncture can be reliably detected.

  According to the first embodiment, the satellite sensors 101 to 106 and the center sensor 100a are acceleration sensors that detect acceleration applied to the vehicle. Therefore, the impact applied by the vehicle can be reliably detected.

(Second Embodiment)
Next, the airbag apparatus of 2nd Embodiment is demonstrated. The airbag apparatus of 2nd Embodiment changes the change method of the determination threshold value in a collision determination part when a tire punctures with respect to the airbag apparatus of 1st Embodiment. Since it is the same structure as the airbag apparatus of 1st Embodiment except for the change method of the determination threshold value in a collision determination part, the structure of an airbag apparatus is demonstrated with reference to FIG.

  As shown in FIG. 3, the microcomputer 100d includes a puncture detection unit B1 (puncture detection unit), a filter unit B2 (filter unit), and a collision determination unit B3 (collision determination unit).

  When the puncture detection unit B1 does not detect tire punctures, the collision determination unit B3 displays the detection results of the satellite sensors 101 to 106 and the center sensor 100a as the respective preset values, as in the first embodiment. A vehicle collision is determined by comparison with a determination threshold. Specifically, when the detection result exceeds the determination threshold, it is determined that a collision has occurred at a predetermined location of the vehicle.

  On the other hand, when the puncture detection unit B1 detects tire puncture, the determination threshold value for the satellite sensors 101 to 106 is set in a direction in which it is difficult to determine that the vehicle has collided, and the determination threshold value for the center sensor 100a is set in a direction in which it is easily determined that the vehicle has collided. Change each. Specifically, the determination threshold for the satellite sensors 101 to 106 is increased, and the determination threshold for the center sensor 100a is decreased. Then, the vehicle collision is determined by comparing the detection results of the satellite sensors 101 to 106 and the center sensor 100a with changed determination thresholds for the respective sensors.

  Next, the operation of the vehicle occupant protection device in the second embodiment will be described with reference to FIG. The operation when the vehicle tire is not punctured is the same as in the first embodiment. On the other hand, when the tire of the vehicle is punctured, the puncture detection unit B1 detects the puncture of the tire. When the puncture detection unit B1 detects tire puncture, the filter unit B2 responds to the vehicle speed after detecting tire puncture, which is superimposed on the input detection results of the satellite sensors 101 to 106 and the center sensor 100a. The pulsed signal having periodicity is reduced and output.

  The collision determination unit B3 raises the determination threshold for the satellite sensors 101 to 106 and lowers the determination threshold for the center sensor 100a, and changes the input detection results of the satellite sensors 101 to 106 and the center sensor 100a for the respective sensors. Compare with the judgment threshold. When the input detection results of the satellite sensors 101 to 106 and the center sensor 100a exceed the changed determination threshold for each sensor, it is determined that a collision has occurred at a predetermined location of the vehicle, and the corresponding airbag is An ignition signal for starting is output.

  Next, the effect will be described. According to 2nd Embodiment, the satellite sensors 101-106 are arrange | positioned in the any one of the front of a vehicle, back, and a side which is easy to receive the impact accompanying a puncture. On the other hand, the center sensor 100a is disposed at the center of the vehicle that is less susceptible to the impact caused by the puncture than the satellite sensors 101 to 106. When the tire is punctured, the determination threshold value for the satellite sensors 101 to 106 that are likely to receive an impact due to the puncture is changed in a direction in which it is difficult to determine that the vehicle has collided. Specifically, the determination threshold value is increased. Therefore, it is possible to suppress erroneous determination caused by the influence of a signal having periodicity corresponding to the vehicle speed, which is caused by puncture. Further, the determination threshold for the center sensor 100a that is not easily affected by the puncture is changed in a direction in which it is easy to determine that the vehicle has collided. Specifically, the determination threshold value is lowered. Therefore, it is possible to determine the vehicle collision at an early stage while suppressing the influence of a signal having periodicity according to the vehicle speed generated due to the puncture. Therefore, the vehicle collision can be determined more appropriately.

  In the first and second embodiments, an example is given in which the puncture detection unit B1 detects tire punctures based on the detection results of the satellite sensors 101 to 106 and the center sensor 100a input from the communication circuit 100c. However, it is not limited to this. An air pressure sensor for detecting tire air pressure may be provided, and tire puncture may be detected based on the detection result of the air pressure sensor. Since the tire air pressure is directly detected, tire puncture can be reliably detected.

DESCRIPTION OF SYMBOLS 1 ... Airbag apparatus (collision detection apparatus, passenger protection apparatus), 100 ... Airbag ECU, 100a ... Center sensor (impact detection means), 100b ... Communication circuit, 100c ... Ignition circuit , 100d ... microcomputer, B1 ... puncture detection unit (puncture detection means), B2 ... filter unit (filter means), B3 ... collision determination unit (collision determination means), 101-106 Satellite sensors (impact detection means) 107: Front airbag for driver's seat (impact detection means), 108 ... Front airbag for passenger seat (impact detection means), 109, 110 ... Side airbags 111, 112 ... Curtain airbag, 113-116 ... Communication bus

Claims (10)

An impact detection means for detecting an impact applied to the vehicle;
Collision determination means for determining a vehicle collision based on the detection result of the impact detection means;
In a collision detection device comprising:
A collision means comprising: filter means for subtracting a specific signal caused by the tire puncture from the detection result of the impact detection means input to the collision determination means when the vehicle tire is punctured. Detection device.   The collision determination unit determines a vehicle collision by comparing a detection result of the impact detection unit with a determination threshold for the impact detection unit. When the tire is punctured, the collision determination unit sets the determination threshold for the impact detection unit as a vehicle collision. The collision detection device according to claim 1, wherein the collision detection device is changed in a direction that is difficult to determine. The impact detection means is disposed at least one of the front, rear and side of the vehicle, and a satellite sensor that detects an impact applied to the vehicle;
A center sensor disposed in the center of the vehicle for detecting an impact applied to the vehicle;
Have
The collision determination means compares the detection result of the satellite sensor with a determination threshold for the satellite sensor, compares the detection result of the center sensor with a determination threshold for the center sensor, determines a vehicle collision, and the tire When a puncture occurs, the determination threshold for the satellite sensor is changed in a direction in which it is difficult to determine that a vehicle has collided, and the determination threshold for the center sensor is changed in a direction in which it is easy to determine that a vehicle has collided. Item 2. The collision detection device according to Item 1. Puncture detecting means for detecting puncture of the tire,
4. The filter device according to claim 1, wherein when the puncture detection unit detects a puncture of the tire, the filter unit subtracts the specific signal generated due to the puncture of the tire. The collision detection apparatus described in 1.   5. The collision detection apparatus according to claim 4, wherein the puncture detection unit detects a puncture of the tire based on a detection result of the impact detection unit.   6. The collision detection apparatus according to claim 5, wherein the puncture detection unit detects a puncture of the tire based on a signal having a periodicity corresponding to a vehicle speed generated in a detection result of the impact detection unit. The puncture detecting means has an air pressure sensor for detecting an air pressure of the tire,
The collision detection device according to claim 4, wherein the tire puncture is detected based on a detection result of the air pressure sensor.   The collision detection device according to claim 1, wherein the filter unit subtracts a signal having periodicity according to a vehicle speed.   The collision detection device according to claim 1, wherein the impact detection unit is an acceleration sensor that detects an acceleration applied to the vehicle.   The collision detection device according to claim 1, wherein the collision detection device is used in an occupant protection device that protects an occupant of the vehicle at the time of a vehicle collision.

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