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Method for diagnosing as to signal plausibility with a speed sensor of a motor vehicle

  • US 20040158372A1
  • Filed: 02/04/2004
  • Published: 08/12/2004
  • Est. Priority Date: 02/06/2003
  • Status: Active Grant
First Claim
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1. A method for making a diagnosis as to signal plausibility in a speed sensor of a motor vehicle, the method comprising the steps of:

  • causing said speed sensor to output a pulse sequence to an evaluation circuit in dependence upon the speed of the vehicle;

    in a steady-state operating condition of said motor vehicle, forming a ratio between the determined speed and a motor rpm and averaging said ratio over a pregiven time; and

    , only determining said signal plausibility when the formed mean value lies in a value range permissible for the steady-state operating condition.

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