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Malfunction detection device and method for a wheel speed sensor

  • US 6,170,923 B1
  • Filed: 08/24/1998
  • Issued: 01/09/2001
  • Est. Priority Date: 08/25/1997
  • Status: Expired due to Term
First Claim
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1. A malfunction detection device for a wheel speed sensor comprising:

  • a comparison circuit for comparing a wheel speed signal output from a wheel speed sensor with a predetermined voltage;

    a calculation circuit selectively increasing or decreasing a counter according to an output signal of the comparison circuit;

    a malfunction signal output circuit outputting a malfunction signal when the counter of the calculation circuit reaches a predetermined value; and

    wherein speeds of the increase and the decrease of the counter differ from each other.

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