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Method of determining rotary speed of a rotating element in a braking effort regulation system

  • US 4,712,186 A
  • Filed: 09/03/1985
  • Issued: 12/08/1987
  • Est. Priority Date: 09/07/1984
  • Status: Expired due to Fees
First Claim
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1. In a system for preventing slippage of at least one wheel of a vehicle, a method of regulating wheel braking effort as a function of rotary speed of a vehicle wheel subject to wide speed variations and of providing control output signals representative of wheel speed even under slow wheel operating conditions, said slippage-preventing system havinga transducer (1) which provides a transduced output signal (uS) having a frequency representative of the speed of the wheel and an evaluation circuit (2-9) which processes said transducer output signal (uS) and provides the control output signal (nR) which has a characteristic value which is representative of and proportional to the speed of the wheel,comprising the steps ofdigitizing the transducer output signal (uS) to derive a digital signal (uS2);

  • calculating (7) the inverse function of the digital signal to derive an essentially triangular-wave-shaped signal (y2);

    determining (8) the degree of slope of the essentially linear portions of the triangular-wave-shaped signal (y2) to derive a differentiated signal (y3), which differentiated signal is representative of the speed of the wheel;

    obtaining said control output signal (nR) from the differentiated signal (yR); and

    regulating braking effort in said slippage-preventing system as a function of said control output signal (nR).

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