JP2009292169A - Air bag deployment control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bag deployment control device capable of certainly deploying an air bag device even when a problem occurs in a front sensor due to a collision. <P>SOLUTION: A first deployment determination means comprises a trigger determination block 411, a G operation block 412, and a deployment determination block 413, which determine whether or not the air bag device 5 is to be deployed based on a detection value of a front G sensor (front sensor) 2 installed in a vehicle front part. The first deployment determination means forcibly determines to deploy the air bag device 5 since the problem is caused in the front G sensor 2 by the collision when no more detection value from the front G sensor 2 is input after the detection value exceeds a first collision determination threshold (predetermined threshold). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an airbag deployment control device that drives and controls an airbag device based on a detection value of a front sensor attached to the front portion of the vehicle and a detection value of a center sensor attached to the rear of the vehicle relative to the front sensor. It is about.

  Conventionally, there has been known an airbag deployment control device that controls an airbag device based on a detection value of a front acceleration sensor attached to a front portion of a vehicle and a detection value of a center acceleration sensor attached to a vehicle central portion. (For example, refer to Patent Document 1).

  Here, in the airbag deployment control device described in Patent Document 1, if noise enters the front acceleration sensor or the center acceleration sensor, a failure may occur in the deployment determination of the airbag device.

Therefore, the determination of deploying the airbag device and the occurrence of a collision are performed based on the detection value of the front acceleration sensor, and the determination of the deployment of the airbag device and the determination of the occurrence of collision are performed based on the detection value of the center acceleration sensor. When it is determined that the airbag device is to be deployed based on the detection value of the front acceleration sensor and it is determined that a collision has occurred based on the detection value of the center acceleration sensor, or the collision has occurred based on the detection value of the front acceleration sensor And an airbag deployment control device that deploys the airbag device is considered in any of the cases where it is determined that the airbag device is deployed based on the detection value of the center acceleration sensor.
JP 2006-44432 A

  By the way, in the above-described airbag deployment control device, in order to determine that the airbag device is to be deployed based on the detection value of the front acceleration sensor, it is first determined whether or not the detection value exceeds a predetermined first threshold value. .

  When the detected value exceeds the first threshold value, a time integral value of the detected value is calculated, and when the calculated integrated value exceeds a predetermined second threshold value, it is determined that the airbag device is deployed.

  Here, since the front acceleration sensor is attached to the front part of the vehicle, it is easy to receive an impact at the time of the vehicle collision, and when the front acceleration sensor attached to the front part of the vehicle is damaged due to this impact, such as breakage or disconnection The detection value of the front acceleration sensor may not be acquired.

  That is, in the airbag deployment device described above, even if the detection value of the front acceleration sensor exceeds the first threshold value, the detection value from the front acceleration sensor cannot be obtained and the time integral value cannot be calculated thereafter. there were. For this reason, it is impossible to determine whether or not to deploy the airbag device based on the detection value of the front acceleration sensor, and there is a problem that the airbag device cannot be appropriately controlled.

  Further, when the detection value of the front acceleration sensor cannot be acquired due to disconnection or the like that occurs during normal traveling, a warning is given such as turning on a warning lamp in the airbag device.

  For this reason, it is necessary to distinguish between a failure of the front acceleration sensor caused by the collision and a failure of the front acceleration sensor that requires a warning.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an airbag deployment control device that can reliably deploy an airbag device even when a malfunction occurs in a front sensor attached to the front portion of the vehicle due to an impact caused by a collision. It is said.

  In order to solve the above problems, an airbag deployment control device according to the present invention includes a detection value of a front sensor attached to a front portion of a vehicle and a detection value of a center sensor attached to the vehicle rear side of the front sensor. A first deployment determination means for determining whether to deploy the airbag device based on a detection value of the front sensor, and a detection value of the front sensor First collision determination means for determining whether or not a collision has occurred, second deployment determination means for determining whether or not to deploy the airbag device based on a detection value of the center sensor, and the center A second collision determining means for determining whether or not a collision has occurred based on a detection value of the sensor, and a determination that the first deployment determining means deploys the airbag device; And when the second collision determination means determines that the collision has occurred, a first deployment permission means that outputs a deployment permission signal of the airbag device, and the second deployment determination means causes the airbag device to A second deployment permission unit that outputs a deployment permission signal of the airbag device when the first collision determination unit determines that the collision has occurred, and the first deployment permission unit; When the deployment permission signal is output, or when the deployment permission signal is output from the second deployment permission means, the final deployment permission means for outputting a drive signal to the airbag device, When the detection value from the front sensor is not input after the detection value of the front sensor exceeds a predetermined threshold value, the first deployment determination means causes the front sensor As defect occurs, it is characterized in that determines to deploy the airbag device.

  Further, the airbag deployment control device according to the present invention is based on the detection value of the front sensor attached to the front portion of the vehicle and the detection value of the center sensor attached to the vehicle rear side of the front sensor. An apparatus for controlling the apparatus, and a deployment determination means for determining whether or not to deploy the airbag apparatus based on a detection value of the front sensor; and whether or not a collision has occurred based on a detection value of the center sensor A collision determination means for determining whether or not the deployment determination means deploys the airbag apparatus, and when the collision determination means determines that the collision has occurred, a drive signal is sent to the airbag apparatus. In the case of the one having the deployment permission means for outputting, the deployment determination means, after the detected value of the front sensor exceeds a predetermined threshold, When the detection value from the sensor is not input, a bug of the front sensor is generated by the collision, it is characterized in that determines to deploy the airbag device.

  According to the present invention, if the detection value from the front sensor is not input after the detection value of the front sensor exceeds the predetermined threshold value, the first sensor is assumed to be defective due to an impact due to a collision. The deployment determination means or the deployment determination means forcibly determines that the airbag device is to be deployed.

  Thereby, even if the detection value of the front sensor cannot be input, it is possible to output the deployment permission signal or the drive signal of the airbag device, and the airbag device can be deployed.

  Further, if the detection value from the front sensor is not input even though the detection value of the front sensor does not exceed the predetermined threshold value, the determination to deploy the airbag device is not performed.

  For this reason, the airbag device is not controlled for deployment due to a malfunction of the front sensor that requires a warning such as a broken wire that occurs during normal travel. It is possible to isolate the defect.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment of an airbag deployment control device according to the present invention will be described based on the drawings.

  1 is an occupant protection device for a front collision, and includes a front G sensor (front sensor) 2, a center G sensor (center sensor) 3, an airbag deployment control device 4, and an airbag device 5. I have.

  The front G sensor 2 is an acceleration sensor for detecting a front collision. As shown in FIG. 2, the front G sensor 2 is attached to the approximate center of the front portion of the vehicle 10 (for example, in the vicinity of the radiator grill).

  The center G sensor 3 is an acceleration sensor for detecting a front collision. As shown in FIG. 2, the center G sensor 3 is attached to a substantially central portion of the vehicle 10 in the front-rear direction and the left-right direction (for example, a floor tunnel portion in the vehicle interior or a floor near the shift lever). Note that the center G sensor 3 does not have to be strictly disposed in the approximate center of the vehicle in the front-rear direction, and may be disposed on the vehicle rear side with respect to the front G sensor 2.

  The airbag device 5 includes an inflator and an ignition circuit (not shown), a front airbag 6 (see FIG. 2), and the like, and controls the front airbag 6 based on a drive signal input from the airbag deployment control device 4. To do.

  The airbag deployment control device 4 deploys the airbag device 5. As shown in FIG. 2, the airbag deployment control device 4 is attached to a substantially central portion of the vehicle 10 in the front-rear direction and the left-right direction, and is integrated with the center G sensor 3 described above.

  Further, as shown in FIG. 1, the airbag deployment control device 4 includes a front side deployment control unit 41, a center side deployment control unit 42, and a deployment permission control unit 43.

  The front side deployment control unit 41 includes a front side trigger determination block 411, a front side G calculation block 412, a front side deployment determination block 413, and a front side collision determination block 414.

  The front side trigger determination block 411, the front side G calculation block 412 and the front side expansion determination block 413 constitute a first expansion determination means of the present invention. The front-side collision determination block 414 constitutes a first collision determination unit of the present invention.

  The input side of the front trigger determination block 411 is connected to the output side of the front G sensor 2. In the front side trigger determination block 411, a first collision determination threshold value is set in advance. A specific value of the first collision determination threshold is 10 to 20G.

  The input side of the front G calculation block 412 is connected to the output side of the front G sensor 2 and the output side of the front trigger determination block 411.

  The input side of the front side development determination block 413 is connected to the output side of the front side G calculation block 412. In the front side deployment determination block 413, a second collision determination threshold value and a timer time are set in advance.

  The input side of the front side collision determination block 414 is connected to the output side of the front G sensor 2. In the front-side collision determination block 414, a third collision determination threshold is set in advance. The third collision determination threshold value is set to be larger than the first collision determination threshold value and larger than the erroneous detection value of the front G sensor 2 due to noise. A specific value of the third collision determination threshold is 20 to 30G.

  On the other hand, the center side deployment control unit 42 includes a center side trigger judgment block 421, a center side G calculation block 422, a center side deployment judgment block 423, and a center side collision judgment block 424.

  The center side trigger determination block 421, the center side G calculation block 422, and the center side expansion determination block 423 constitute the second expansion determination means of the present invention. The center-side collision determination block 424 constitutes a second collision determination unit of the present invention.

  The input side of the center side trigger determination block 421 is connected to the output side of the center G sensor 3. In the center side trigger determination block 421, a fourth collision determination threshold is set in advance. The specific value of the fourth collision determination threshold is 2 to 6G.

  The input side of the center side G calculation block 422 is connected to the output side of the center G sensor 3 and the output side of the center side trigger determination block 421.

  The input side of the center side development determination block 423 is connected to the output side of the center side G calculation block 422. In the center side deployment determination block 423, a fifth collision determination threshold is set in advance.

  The input side of the center side collision determination block 424 is connected to the output side of the center G sensor 3. In the center side collision determination block 424, a sixth collision determination threshold is set in advance. The sixth collision determination threshold is set to be larger than the fourth collision determination threshold and larger than the false detection value of the center G sensor 3 due to noise. A specific value of the sixth collision determination threshold is 3 to 5G.

  The deployment permission control unit 43 includes a first AND circuit block 431, a second AND circuit block 432, and an OR circuit block 433. The first AND circuit block 431 constitutes a first development permission means of the present invention. The second AND circuit block 432 constitutes a second development permission means of the present invention. Further, the OR circuit block 433 constitutes a final permission means of the present invention.

  The input side of the first AND circuit block 431 is connected to the output side of the failure occurrence determination block 414 and the output side of the center side collision determination block 424. The input side of the second AND circuit block 432 is connected to the output side of the front side collision determination block 414 and the output side of the center side deployment determination block 422. The input side of the OR circuit block 433 is connected to the output side of the first AND circuit block 431 and the output side of the second AND circuit block 432.

  Next, the operation of the airbag deployment control device according to the present invention will be described.

  FIG. 3 is a flowchart showing a flow of airbag deployment control processing by the airbag deployment control device 4.

  Step S <b> 1 is a step of inputting the detection value of the front G sensor 2 to the front trigger block 411 and the front collision determination block 414.

  Step S <b> 2 is a step of inputting the detection value of the center G sensor 3 to the center side trigger block 421 and the center side collision determination block 424. Note that the order of step S1 and step S2 may be reversed.

  Step SA is a first development control process to be described later, and step SB is a second development control process to be described later.

  Step S3 is a step of determining whether or not at least one of the deployment permission signal from the first AND circuit block 431 and the deployment permission signal from the second AND circuit block 432 is input in the OR circuit block 433. is there. If it is determined that the development permission signal is input, the process proceeds to step S4. If it is determined that the development permission signal is not input, the process returns to step S1.

  Step S4 is a step of outputting a signal from the OR circuit block 433. The output drive signal is input to the airbag device 5.

  Step S <b> 5 is a step of executing the deployment of the front airbag 6 in the airbag device 5.

  FIG. 4 is a flowchart showing the flow of the first development control process.

  Step SA1 is a step of determining whether or not the detection value of the front G sensor 2 exceeds the first collision determination threshold value in the front trigger determination block 411. If it is determined that the threshold value is exceeded, an integration start signal is output and the process proceeds to step SA2, and if it is determined that the threshold value is not exceeded, step SA1 is repeated.

  Step SA2 is a step of calculating the time integral value of the front G sensor 2 in the front G calculation block 412 when the integration start signal is inputted. The calculated integral value is input to the front side development determination block 413.

  Step SA3 is a step in which it is determined in the front side development determination block 413 whether or not the input time when the calculated integral value is input exceeds the timer time. If it is determined that the timer time has been exceeded, the process proceeds to step SA4. If the timer time has not been exceeded, the detection value from the front G sensor 2 has not been input, that is, the front G sensor 2 has failed due to a collision. If so, the process proceeds to step SA5.

  Step SA4 is a step of determining whether or not the calculated integrated value exceeds the second collision determination threshold value in the front side expansion determination block 413. If it is determined that the threshold is exceeded, the process proceeds to step SA5, and if it is determined that the threshold is not exceeded, the process returns to step SA2.

  Step SA5 is a step of outputting a deployment determination signal to deploy (drive) the airbag device 5 in the front side deployment determination block 413. The output development determination signal is input to the first AND circuit block 431.

  Step SA6 is a step of determining in the center side collision determination block 424 whether or not the detected value of 3 of the center G sensor exceeds the sixth collision determination threshold value. If it is determined that the threshold value is exceeded, the process proceeds to step SA7. If it is determined that the threshold value is not exceeded, step SA6 is repeated.

  Step SA7 is a step of outputting a collision occurrence signal in the center side collision determination block 424, assuming that a collision has occurred. The output collision occurrence signal is input to the first AND circuit block 431.

  Step SA8 is a step of outputting a deployment permission signal because the deployment determination signal and the collision occurrence signal are input in the first AND circuit block 431, respectively. The output expansion permission signal is input to the OR circuit block 433.

  FIG. 5 is a flowchart showing the flow of the second development control process.

  Step SB1 is a step of determining whether or not the detection value of the center G sensor 2 exceeds the fourth collision determination threshold in the center side trigger determination block 421. If it is determined that the threshold value is exceeded, an integration start signal is output and the process proceeds to step SB2. If it is determined that the threshold value is not exceeded, step SB1 is repeated.

  Step SB2 is a step of calculating the time integral value of the center G sensor 2 in the center side G calculation block 422 when the integration start signal is inputted. The calculated integral value is input to the center side development determination block 423.

  Step SB3 is a step of determining whether or not the calculated integral value exceeds the fifth collision determination threshold value in the center side development determination block 423. If it is determined that the threshold is exceeded, the process proceeds to step SB4. If it is determined that the threshold is not exceeded, the process returns to step SB2.

  Step SB4 is a step of outputting a deployment determination signal to deploy (drive) the airbag device 5 in the center-side deployment determination block 423. The output development determination signal is input to the second AND circuit block 432.

  Step SA5 is a step of determining in the front side collision determination block 414 whether or not the detected value of 2 of the front G sensor exceeds the third collision determination threshold value. If it is determined that the threshold value is exceeded, the process proceeds to step SA6. If it is determined that the threshold value is not exceeded, step SA5 is repeated.

  Step SA6 is a step of outputting a collision occurrence signal in the front side collision determination block 414, assuming that a collision has occurred. The output collision occurrence signal is input to the second AND circuit block 432.

  Step SA7 is a step of outputting a deployment permission signal because the deployment determination signal and the collision occurrence signal are input in the second AND circuit block 432, respectively. The output expansion permission signal is input to the OR circuit block 433.

  As described above, in the airbag deployment control device 4 according to the above embodiment, the detection value of the front G sensor 2 is not input after the detection value of the front G sensor 2 exceeds the first collision determination threshold value. In this case, it is determined that a problem has occurred in the front G sensor 2, and a deployment determination signal for determining that the airbag device 5 is to be deployed is forcibly output from the front-side deployment determination block 413.

  Thereby, the deployment permission signal of the airbag device 5 can be output from the first AND circuit block 431, and the airbag device 5 can be driven to deploy.

  Furthermore, when the detection value of the front G sensor 2 does not exceed the first collision determination threshold, the integration start signal is not output, and the time integration value of the center G sensor 2 is not calculated. That is, the deployment determination is not made in the front side deployment determination block 431, and the drive determination signal for the airbag device 5 is not output.

  Therefore, it is not determined that the airbag device 5 is to be deployed due to a malfunction of the front G sensor 2 that requires a warning in the airbag device 5 such as a broken wire that occurs during normal travel. Thereby, the malfunction of the front G sensor 2 caused by the collision can be separated from the malfunction of the front G sensor 2 that has occurred during normal traveling that requires a warning.

  Hereinafter, an airbag deployment control device 204 of an example different from the above embodiment will be described with reference to FIGS. 6 and 7. In addition, the description which attaches | subjects the same code | symbol about the description of the part same or equivalent to the content demonstrated in the said embodiment is demonstrated.

  The occupant protection device 201 according to the first embodiment includes a front G sensor (front sensor) 2, a center G sensor (center sensor) 3, an airbag deployment control device 204, and an airbag device 5.

  As shown in FIG. 6, the airbag deployment control device 204 includes a front side trigger determination block 411, a front side G calculation block 412, a front side deployment determination block 413, a center side collision determination block 424, Circuit block (development permission means) 431.

  The front-side trigger determination block 411, the front-side G calculation block 412 and the front-side expansion determination block 413 constitute the expansion determination means of the present invention. Further, the center side collision determination block 424 constitutes a collision determination means of the present invention.

  FIG. 7 is a flowchart illustrating the flow of the airbag deployment control process performed by the occupant protection device 201 according to the first embodiment.

  Step S11 is a step of inputting the detection value of the front G sensor 2 to the front side trigger block 411, and step S12 is a step of inputting the detection value of the center G sensor 3 to the center side collision determination block 424. Note that the order of step S11 and step S12 may be reversed.

  Step S13 is a step of determining whether or not the detected value of the front G sensor 2 exceeds the first collision determination threshold in the front trigger determination block 411. If it is determined that the threshold value is exceeded, an integration start signal is output and the process proceeds to step S14. If it is determined that the threshold value is not exceeded, step S13 is repeated.

  Step S14 is a step of calculating the time integral value of the front G sensor 2 in the front G calculation block 412 when the integration start signal is inputted. The calculated integral value is input to the front side development determination block 413.

  Step S15 is a step in which it is determined in the front side development determination block 413 whether or not the input time when the calculated integral value is input exceeds the timer time. If it is determined that the timer time has been exceeded, the process proceeds to step S16. If the timer time has not been exceeded, the detection value from the front G sensor 2 has not been input, that is, the front G sensor 2 has failed due to a collision. If not, the process proceeds to step S17.

  Step S16 is a step of determining whether or not the calculated integral value exceeds the second collision determination threshold value in the front side expansion determination block 413. If it is determined that the threshold is exceeded, the process proceeds to step S17. If it is determined that the threshold is not exceeded, the process returns to step S14.

  Step S17 is a step of outputting a deployment determination signal to deploy (drive) the airbag device 5 in the front side deployment determination block 413. The output development determination signal is input to the first AND circuit block 431.

  Step S18 is a step of determining in the center side collision determination block 424 whether or not the detected value of 3 of the center G sensor exceeds the sixth collision determination threshold value. If it is determined that the threshold value is exceeded, the process proceeds to step S19. If it is determined that the threshold value is not exceeded, step S18 is repeated.

  Step S19 is a step of outputting a collision occurrence signal in the center side collision determination block 424, assuming that a collision has occurred. The output collision occurrence signal is input to the first AND circuit block 431.

  Step S20 is a step of outputting a drive signal since the deployment determination signal and the collision occurrence signal are respectively input in the first AND circuit block 431. The output drive signal is input to the airbag device 5.

  Step S <b> 21 is a step of executing the deployment of the front airbag 6 in the airbag device 5.

  As described above, in the airbag deployment control apparatus 204 according to the first embodiment, the detection value of the front G sensor 2 is not input after the detection value of the front G sensor 2 exceeds the first collision determination threshold value. In this case, it is determined that a problem has occurred in the front G sensor 2, and a deployment determination signal for determining that the airbag device 5 is to be deployed is forcibly output from the front-side deployment determination block 413.

  Thereby, the drive signal of the airbag apparatus 5 can be output from the 1st AND circuit block 431, and the airbag apparatus 5 can be drive-deployed.

  Further, when the detection value of the front G sensor 2 does not exceed the first collision determination threshold value, the deployment determination is not made in the front side deployment determination block 413, and the drive determination signal of the airbag device 5 is not output.

  Thereby, the malfunction of the front G sensor 2 caused by the collision can be separated from the malfunction of the front G sensor 2 that has occurred during normal traveling that requires a warning.

It is a block diagram which shows the structure of the passenger | crew protection apparatus provided with the airbag deployment control apparatus which concerns on this invention. It is a top view which shows typically the vehicle provided with the passenger | crew protection device shown in FIG. It is a flowchart which shows the flow of the airbag deployment process in the airbag deployment control apparatus which concerns on this invention. It is a flowchart which shows the flow of the 1st expansion | deployment control processing shown in FIG. It is a flowchart which shows the flow of the 2nd expansion | deployment control processing shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a configuration of an occupant protection device including an airbag deployment control device according to a first embodiment of the present invention. It is a flowchart which shows the flow of the airbag deployment process in the airbag deployment control apparatus shown in FIG.

Explanation of symbols

2 Front G sensor (front sensor)
3 Center G sensor (Center sensor)
4 airbag deployment control device 5 airbag device 411 trigger judgment block (first deployment judgment means)
412 G calculation block (first expansion determination means)
413 Expansion determination block (first expansion determination means)

Claims (2)

An airbag deployment control device that controls an airbag device based on a detection value of a front sensor attached to a front portion of a vehicle and a detection value of a center sensor attached to the vehicle rear side of the front sensor,
First deployment determination means for determining whether or not to deploy the airbag device based on the detection value of the front sensor, and first collision for determining whether or not a collision has occurred based on the detection value of the front sensor Judgment means,
Second deployment determination means for determining whether or not to deploy the airbag device based on the detection value of the center sensor; and second collision for determining whether or not a collision has occurred based on the detection value of the center sensor. Judgment means,
When the first deployment determining means determines that the airbag device is to be deployed, and the second collision determining means determines that the collision has occurred, the first deployment output signal of the airbag device is output. Deployment permission means,
When the second deployment determining means determines that the airbag device is to be deployed, and the first collision determination means determines that the collision has occurred, the second deployment determination signal outputs a deployment permission signal for the airbag device. Deployment permission means,
And a final deployment permission means for outputting a drive signal to the airbag device when a deployment permission signal is output from the first deployment permission means or when a deployment permission signal is output from the second deployment permission means. And
When the detection value from the front sensor is no longer input after the detection value of the front sensor exceeds a predetermined threshold, the first deployment determination means determines that the malfunction of the front sensor has occurred due to a collision. An airbag deployment control device that determines to deploy an airbag device. An airbag deployment control device that controls an airbag device based on a detection value of a front sensor attached to a front portion of a vehicle and a detection value of a center sensor attached to the vehicle rear side of the front sensor,
Deployment determination means for determining whether to deploy the airbag device based on the detection value of the front sensor; collision determination means for determining whether a collision has occurred based on the detection value of the center sensor;
Deployment permission means for outputting a drive signal to the airbag device when the deployment judgment means judges that the airbag device is deployed and the collision judgment means judges that the collision has occurred; ,
If the detection value from the front sensor is not input after the detection value of the front sensor exceeds a predetermined threshold value, the deployment determination means determines that the front sensor has failed due to a collision. An airbag deployment control device characterized by determining that the device is deployed.

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