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Method for controlling expansion of an air bag

  • US 7,184,870 B2
  • Filed: 05/16/2003
  • Issued: 02/27/2007
  • Est. Priority Date: 05/16/2002
  • Status: Expired due to Fees
First Claim
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1. 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.

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