PURPOSE: To actuate an air bag by deciding an amount of physical change of a vehicle based on a deceleration signal from a G sensor, in an air bag control device.
CONSTITUTION: In a controller 9 of an air bag control device, a deceleration (-G) signal from a G sensor 15 is integrated to obtain a speed arithmetic value which is a physical change amount of a vehicle. When this speed arithmetic value exceeds a predetermined threshold value, an ignition signal to an inflater 8 is output to actuate an air bag 5. Here, the initial waveform width of the deceleration signal is longer at low speed time than at intermediate speed time. When the waveform width exceeds a predetermined time at intermediate speed time, a low speed is decided to transfer the threshold value so as to increase. In this air bag control device, even when the speed arithmetic value at low speed time and intermediate speed time resembles closely in the initial stage, decision is made by the initial waveform width of the deceleration signal. Thus by deciding a speed in the point of time earlier than in the past, the air bag 5 can be actuated.
| WO/2006/039408 | APPARATUS FOR OCCUPANT DETECTION |
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| JP2000127889 | OCCUPANT PROTECTION DEVICE |
TAKAHASHI YUJI
HIRAMITSU TETSUJI
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