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SIR deployment method based on occupant displacement and crash severity

  • US 5,430,649 A
  • Filed: 11/26/1993
  • Issued: 07/04/1995
  • Est. Priority Date: 11/26/1993
  • Status: Expired due to Term
First Claim
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1. A control method for deployment of a supplemental inflatable restraint (SIR) in a motor vehicle based on a measured vehicle acceleration to arrest occupant displacement, the method comprising the steps of:

  • in response to an initiation of a vehicle crash event, repeatedly integrating the measured vehicle acceleration to form signals corresponding to initial vehicle velocity and initial vehicle displacement, filtering the measured vehicle acceleration to form a signal corresponding to an average vehicle acceleration, and estimating a future occupant displacement due to the crash event in accordance with the initial displacement signal, the initial velocity signal, the average vehicle acceleration signal and a time interval nominally required to deploy said SIR;

    comparing said estimate of future occupant displacement to a threshold displacement corresponding to a maximum desired occupant displacement at the time of SIR deployment;

    estimating severity of the crash event once said estimate of future occupant displacement exceeds said threshold displacement; and

    deploying the SIR when the estimated severity of the crash event exceeds a predetermined severity threshold.

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