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Passenger restraint system with an electronic crash sensor

  • US 5,610,817 A
  • Filed: 02/08/1993
  • Issued: 03/11/1997
  • Est. Priority Date: 02/08/1993
  • Status: Expired due to Fees
First Claim
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1. A collision detecting system comprising:

  • a. electronic sensor means mounted on a motor vehicle member for generating an electrical input signal substantially to the acceleration of said vehicle member;

    b. first signal processing means for receiving the electrical input signal from said electronic sensor and generating a jerk signal indicative of the jerk of said member, said first signal processing means generating a first trigger signal responsive to a jerk signal of a preselected value, said first signal processing means including;

    (i) differentiating means for differentiating said electrical input signal to generate said jerk signal,(ii) means for generating the magnitude of said jerk signal,(iii) first summing means for generating a first difference signal dependent on the difference between the magnitude of said jerk signal and a first reference selected independently from said electrical input signal,(iv) first integrating means for integrating said first difference signal to generate a first integrated signal, said integrating means being constructed such that said first integrated signal never has a negative value, and(v) first comparator means for comparing said first integrated signal to a second reference selected independently from said electrical input signal;

    c. second signal processing means for receiving the electrical input signal from said electronic sensor and generating a signal indicative of a change in acceleration of said member, said second signal processing means generating a second trigger signal responsive to a change in acceleration of said member of a preselected value, said second signal processing means including;

    (i) summing means for obtaining a second difference signal between said electrical input signal a third reference signal selected independently from said electrical input signal,(ii) integrating means for integrating said second difference signal over time to generate a second integrated signal, said integrating means being constructed such that said second integrated signal never has a negative value, and(iii) comparator means for comparing the second integrated signal with a fourth reference signal selected independently from said electrical input signal; and

    d. triggering means for triggering a passenger protection means in response to either said first trigger signal or said second trigger signal.

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