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Active brake sensor

  • US 5,372,221 A
  • Filed: 07/20/1992
  • Issued: 12/13/1994
  • Est. Priority Date: 07/20/1992
  • Status: Expired due to Fees
First Claim
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1. A brake sensing method, comprising the steps of:

  • providing an oscillating electrical signal (54);

    providing, in response to the oscillating electrical signal, an ultrasonic wave for transmission through a brake shoe and pad;

    providing, in response to the transmitted ultrasonic wave or a reflection thereof, a sensed electrical signal (56); and

    providing, in response to the sensed electrical signal, a brake on/off status signal (60) or a brake fault signal (62) indicative of a brake drag condition or a wet brake condition.

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