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Vehicle acceleration sensor

  • US 5,363,300 A
  • Filed: 02/01/1993
  • Issued: 11/08/1994
  • Est. Priority Date: 02/01/1993
  • Status: Expired due to Fees
First Claim
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1. A method of determining the acceleration of a vehicle from an acceleration signal α

  • r generated by an accelerometer carried by the vehicle, the acceleration signal being contaminated by a noise signal, the method comprising the steps of;

    determining a magnitude n.sub.α

    of the noise signal;

    filtering the acceleration signal α

    r by a filter having a time constant C to generate a filtered acceleration signal α

    f having a magnitude that comprises the determination of the vehicle acceleration;

    comparing the magnitude of a difference between the acceleration signal α

    r and the filtered acceleration signal α

    f with a magnitude of a predetermined function of the noise signal;

    setting the value of the time constant C equal to a value C1 when the magnitude of the difference between the acceleration signal α

    r and the filtered acceleration signal α

    f is less than the magnitude of the predetermined function of the noise signal, the value C1 establishing a predetermined low cutoff frequency of the filter to remove the noise signal from the acceleration signal α

    r ; and

    setting the value of the time constant C equal to a value Ch when the magnitude of the difference between the acceleration signal α

    r and the filtered acceleration signal α

    f is greater than the magnitude of the predetermined function of the noise signal, the value Ch establishing a predetermined cutoff frequency of the filter higher than the predetermined low cutoff frequency so that the determination of vehicle acceleration represented by the filtered acceleration signal α

    f more rapidly responds to rapid changes int he actual vehicle acceleration.

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