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Method and apparatus for sensing a vehicle crash with frequency domain boost

  • US 5,034,891 A
  • Filed: 11/03/1989
  • Issued: 07/23/1991
  • Est. Priority Date: 11/03/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for providing an actuation signal for a passenger restraint system in a vehicle upon the occurrence of a predetermined type of vehicle crash condition, said apparatus comprising:

  • sensing means securable to the vehicle for providing a vibratory electric signal having various frequency components upon the occurrence of a vehicle crash condition;

    filter means connected to said sensing means providing a signal having a positive voltage value when said sensing means provides a signal that includes particular frequency components which have been empirically determined to be indicative of the vehicle being in said predetermined type of vehicle crash condition;

    integrator means connected to said sensing means for providing an electrical signal indicative of the integral of said signal provided by said sensing means;

    summing circuit connected to an output of said filter means and an output of said integrator means for providing a signal indicative of the value of the sum of said positive voltage value signal from said filter means and said signal from said integrator means, said positive voltage value signal from said filter means boosting said signal from said summing circuit; and

    signal generator means for providing said actuation signal when said signal from said summing circuit exceeds a predetermined value.

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