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Fault detection for wheel slip control system

  • US 4,013,324 A
  • Filed: 10/06/1975
  • Issued: 03/22/1977
  • Est. Priority Date: 10/06/1975
  • Status: Expired due to Term
First Claim
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1. In a wheel slip control system having electric solenoids therein which are energized by an electric pulse in response to a logic circuit, and further having at least two point-type speed sensors which generate electrical signals having amplitudes proportional to wheel speeds, the invention of a fault detection system comprising:

  • a. a first cyclic timing means operable in response to at least a first wheel slip control system signal to begin a timing cycle;

    b. means for resetting said first cyclic timing means in response to at least a second wheel slip control system signal provided that said second wheel slip control system signal occurs before the end of the timing cycle of said first cyclic timing means;

    c. means for generating a first wheel slip control system shutdown signal when said first cyclic timing means fails to be reset before the end of its timing cycle;

    d. a second cyclic timing means operable in response to at least a third wheel slip control system signal to begin a timing cycle;

    e. means for resetting said second cyclic timing means in response to said second wheel slip control system signal provided that said second wheel slip control system signal occurs before the end of the timing cycle of said cycle of said second cyclic timing means;

    f. means for inhibiting the resetting of said second cyclic timing means in response to said second wheel slip control system signal having a predetermined characteristic; and

    g. means for generating a second wheel slip control system shutdown signal when said second cyclic timing means fails to be reset before the end of its timing cycle.

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