Patent ID: 7184870

Claim:
A method for controlling expansion of an air bag, the method comprising: (a) detecting a deceleration of a vehicle in a vehicle collision at a deceleration detector and applying the detected deceleration signal to a microcomputer; (b) analyzing a collision waveform generated according to the deceleration signal and determining an impact degree of the vehicle at the microcomputer; (c) temporarily stopping operation of the deceleration detector at the microcomputer while the deceleration of the vehicle is increasing; (d) initializing an initial collision waveform while the operation of the deceleration detector is stopped, the initial collision waveform being inputted before the microcomputer stops the operation of the deceleration detector; (e) re-operating the deceleration detector at the microcomputer, detecting again the deceleration of the vehicle at the deceleration detector, and applying the newly detected deceleration signal to the microcomputer to obtain a second collision waveform; and (f) when the second collision waveform reaches a first set value, operating an air bag driving unit at the microcomputer to thereby expand the air bag; whereby an expansion time of the air bag is controlled closely in conformance with a required time to fire (RTTF), thereby achieving a more stable expansion performance of the air bag.