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Method and apparatus for determining vehicle speed

  • US 6,426,694 B1
  • Filed: 09/06/2001
  • Issued: 07/30/2002
  • Est. Priority Date: 08/09/2000
  • Status: Expired due to Fees
First Claim
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1. Apparatus for determining speed for a vehicle, comprising:

  • a plurality of wheels;

    an anti-lock brake system including a rotational velocity signal generator for each of the plurality of wheels;

    a wheel speed averager for producing a raw average speed signal;

    a global position sensing unit providing vehicle positional data;

    means responsive to the rotational velocity signals for determining side to side variation in wheel speeds indicative of a turn;

    calibration means operating on the vehicle positional data in the absence of indication of a turn for generating a reference speed signal; and

    means taking the raw average speed signal and the reference speed signal as inputs, and using the speed reference signal to calibrate the raw average speed signal for generating a speedometer signal.

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