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Vehicle control system for determining verified wheel speed signals

  • US 5,404,304 A
  • Filed: 11/19/1993
  • Issued: 04/04/1995
  • Est. Priority Date: 11/19/1993
  • Status: Expired due to Term
First Claim
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1. A vehicle control system for determining verified wheel speed information, comprising:

  • a plurality of wheel speed sensors for generating wheel speed input signals for each of a plurality of vehicle wheels, each such signal having an edge repetition rate which varies in proportion to the speed of a respective vehicle wheel;

    means for producing square wave signals corresponding to each wheel speed input signal;

    hardware circuit means for developing a running measure of the speed of each wheel based on the edge repetition rate of each of said square wave signals;

    test means for independently supplying a the square wave signal for a selected vehicle wheel to a register which generates an interrupt signal at each edge of such square wave signal; and

    means including a microprocessor for(a) periodically sampling the wheel speeds developed by said hardware circuit means for vehicle control purposes;

    (b) separately determining a test wheel speed value based on the repetition rate of the interrupt signals generated by said test means;

    (c) comparing said test wheel speed value with the sampled wheel speed for said selected vehicle wheel; and

    (d) indicating verified operation of said control system when said test wheel speed value matches said sampled wheel speed.

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