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Method of controlling slipping or spinning of a vehicle wheel

  • US 4,760,893 A
  • Filed: 10/17/1986
  • Issued: 08/02/1988
  • Est. Priority Date: 10/22/1985
  • Status: Expired due to Term
First Claim
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1. A method of controlling slipping or spinning of a wheel of a vehicle, wherein the vehicle hasdriven wheels and non-driven or rolling wheels, anda slip control system for the driven wheels,comprising the steps ofsensing if a respective driven wheel slips or spins above a predetermined slip level, or rotates under conditions indicating a tendency to slip or spin above said predetermined slip level;

  • monitoring the speed of at least one of the rolling wheels and deriving rolling wheel output signals representative of said monitored speed;

    sensing the speed of at least one driven wheel and deriving driven wheel output signals representative of said sensed speed;

    generating a reference parameter signal representative of the speed of the at least one rolling wheel;

    comparing the driven wheel output signals with the reference parameter and deriving a comparison signal indicative of slip or incipient slip;

    decreasing the speed of rotation of said respective driven wheel when said comparison signal representative of slip indicates wheel slip above said predetermined slip level;

    in successive time steps, testing the rolling wheel output signals representative of the speed of the rolling wheel to determine if the signal has a characteristic indicative of change of speed of the rolling wheel which is not physically possible, andif the test indicates a condition of the signal representative of a physically impossible condition,generating, as the comparison signal, a new signal which is representative of at least a lesser change of speed than the rolling wheel output signal representative of said monitored speed.

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