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Method for activating an occupanct restraint in a vehicle

  • US 5,394,328 A
  • Filed: 02/25/1994
  • Issued: 02/28/1995
  • Est. Priority Date: 02/25/1994
  • Status: Expired due to Fees
First Claim
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1. A method for activating an impact responsive device in a vehicle comprising the steps of:

  • defining a deceleration bias value;

    defining an activation threshold line identifying when said device is to be activated comprises the steps of;

    selecting an initial displacement value;

    selecting an initial energy density value, said initial displacement value and said initial energy density value defining an origin of said activation threshold window; and

    selecting a slope for a line extending from said origin to define said activation threshold line;

    sensing deceleration of said vehicle;

    comparing sensed deceleration and said deceleration bias value to determine whether said sensed deceleration is greater than said deceleration bias value;

    determining displacement of said vehicle based on said sensed deceleration when said sensed deceleration is greater than said deceleration bias value;

    subtracting said deceleration bias value from said sensed deceleration to produce a threshold deceleration;

    integrating said threshold deceleration with respect to said displacement of said vehicle to determine residual energy density; and

    activating said device based on said residual energy density and said activation threshold line.

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