JPH06340244A - Starting timing deciding method for safety device - Google Patents

Abstract

PURPOSE:To provide a starting timing deciding method for a safety device capable of starting plural on-vehicle safety devices at desired timing respectively. CONSTITUTION:Starting timing for a pre-tensioner device and an air bag device can be independently decided by successively switching modes corresponding to the on-vehicle pretensioner device and air bag device (S214) by processes (S201-S213) taking acceleration data produced at the time of the collision of a vehicle to judge a collision condition and deciding the starting timing of an on-board safety device based on a judgment result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device such as an air bag device and a pretensioner device mounted on a vehicle, and more particularly to a start timing determining method for determining the start timing of these safety devices.

[0002]

2. Description of the Related Art As a safety device for restraining an occupant in a vehicle collision, for example, there are an airbag device and a pretensioner device. In recent years, for the purpose of more reliably restraining an occupant in the event of a collision, there is a tendency to equip each seat with a safety device, and to equip each seat with a plurality of safety devices including an airbag device and a pretensioner device. In particular, by mounting a plurality of safety devices on each seat, even if one safety device is disabled, the other safety device can reliably restrain the occupant.

[0003]

As described above, by mounting the safety device on each seat and mounting a plurality of safety devices on each seat, it is possible to reliably restrain the occupant in the event of a collision. Become. However, for example, since the distance from the mounting position to the occupant position is different between the airbag device mounted on the passenger seat and the airbag device mounted on the driver seat,
In order to give the same impact absorbing effect to each occupant, it is originally necessary to make the activation timing of each airbag device different.

Further, since each safety device generates a considerable restraint force, when a plurality of safety devices mounted on each seat are simultaneously activated, the occupant is restrained more than necessary. . For example, if you collide at low speed,
The activation of the pretensioner device is sufficient to protect the occupant. Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a safety device activation timing determination method capable of activating each of a plurality of safety devices mounted on a vehicle at a desired time. .

[0005]

A method for determining a start time of a safety device according to the present invention incorporates acceleration data generated at the time of a collision of a vehicle to judge a collision state, and is mounted on the vehicle based on the judgment result. The processing for determining the activation timing of the safety device is such that the processing modes corresponding to the plurality of safety devices mounted on the vehicle are sequentially switched to independently determine the activation timing of these safety devices.

[0006]

According to the above-mentioned means according to the present invention, the safety devices are independently activated by executing the processing for determining the activation timing of the safety devices for the plurality of safety devices mounted on the vehicle. It There are various possible activation patterns for each safety device.For example, when a collision occurs at low speed, one of the safety devices installed in each seat is activated, and when a collision occurs at high speed, all safety devices are activated. In addition to activating the safety device, each safety device is activated at appropriate intervals according to the collision situation so as to maintain the restraining force of the occupant.

Further, for example, in the case of an airbag device mounted on a driver's seat and a passenger seat, the airbag device mounted on the driver's seat is activated first.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. Figure 1
As shown in FIG. 2, the ignition circuits 101 and 103 of the airbag devices mounted on the driver's seat and the passenger seat, respectively, and the ignition circuit 1 of the pretensioner devices mounted on the seats.
05 are connected to the ignition determination circuit 107, respectively.

The ignition determination circuit 107 performs initialization and failure diagnosis, and determines the ignition timing of each ignition circuit by interrupt processing at predetermined intervals. Hereinafter, the process of determining the ignition timing of each ignition circuit will be described with reference to FIG. The ignition timing determination process is executed for each of the mode assigned to the pretensioner device and the mode assigned to the airbag device.

First, in order to execute the processing for determining the ignition timing of the ignition circuit of the pretensioner device, the mode is set to 0 (S201), and then the acceleration data is fetched (S202). Then, it is determined whether the set mode is 0 or 1 (S203). If it is determined that the mode is 2 or more (No in S203), the mode is set to 0 (S204), and the process ends. Mode is 0
Or, if it is determined to be 1 (S203 Yes),
Further, it is determined whether or not the ignition circuit of the safety device is before ignition processing (S205).

If it is judged that the ignition process has not been carried out yet (S20
5 Yes), and it is further determined whether the collision determination is being executed (S206). If it is determined that the collision determination is being executed (Yes in S206), the collision determination processing routine is executed based on the acquired acceleration data (S207),
It is determined whether ignition processing is required (S208).

When it is judged that ignition processing is necessary (S208)
Yes), the ignition process is executed (S209). When the execution of each of the above processes is completed, 1 is added to the mode (S2
14) Similarly, the following mode of processing (processing for the airbag device) is executed. If it is determined that the ignition circuit has completed the ignition process (No in S205), the process after the ignition (for example, the lamp lighting indicating that the ignition is finished) is executed (S210), and then the process in the next mode is executed. To be done. Further, when it is determined that the collision determination is not executed (No in S206), it is determined whether the captured acceleration data exceeds a predetermined threshold value (S211).

Different values are set as the threshold values for the airbag, the pretensioner, the driver's seat, and the passenger's seat, respectively, if necessary. When it is determined that the acceleration data exceeds the predetermined threshold value (Yes in S211), it is set that the collision determination is being executed (S212), and then the process of the next mode is executed. On the other hand, if it is determined that the acceleration data is less than or equal to the predetermined threshold value (No in S211), it is set that the collision determination is not executed (S213), and then the process of the next mode is executed.

If it is determined that the ignition circuit does not need ignition (S208 No), such as when the collision determination processing routine does not determine that a collision occurs even if the threshold value is exceeded, the ignition processing (S209) is not performed and the next operation is performed. The processing of the mode is executed. Each of the above determination processes is determined by detecting the flag state of the data.

In the embodiment described above, the case where the start times of the airbag and the pretensioner mounted on the driver's seat and the passenger's seat are respectively determined has been described. But,
For example, the activation timing of a plurality of safety devices mounted on a plurality of seats such as a driver's seat and a passenger seat can also be determined by sequentially switching the modes assigned to each safety device.

[0016]

According to the invention described above, the activation timing of a plurality of safety devices mounted on a vehicle, such as safety devices mounted on a plurality of seats and a plurality of safety devices mounted on each seat, can be set. , Each of these safety devices can be activated individually at a desired time. This makes it possible to protect the occupant according to the state of collision.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a process of an ignition determination circuit 107 shown in FIG.

[Explanation of symbols]

 101, 103 Ignition circuit of airbag device 105 Ignition circuit of pretensioner device 107 Ignition determination circuit

Claims (1)

[Claims] 1. A safety device comprising a process of taking acceleration data generated at the time of a collision of a vehicle, determining a collision state, and determining a start time of a safety device mounted on the vehicle based on the determination result. In the startup timing determination method, the vehicle has a plurality of safety devices, and the processing sequentially determines the startup timing of each safety device by sequentially switching the processing modes corresponding to the safety devices. And a method for determining a start time of a safety device.