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Variable duty cycle antilock braking system with accelerometer and fail-safe

  • US 5,553,930 A
  • Filed: 09/06/1995
  • Issued: 09/10/1996
  • Est. Priority Date: 12/12/1994
  • Status: Expired due to Fees
First Claim
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1. In the control of a vehicle anti-lock braking system, the method of searching for an optimum wheel speed reference (39) comprising the steps of:

  • determining (119) on which side of the peak of a mu-slip curve the vehicle is operating by repeatedly computing a wheel speed reference to determining the sign of the ratio of the most recent change in measured acceleration to the most recent change in computed wheel slip, and updating a previously computed wheel speed reference by incrementing (103) that previous reference by the sum of a first amount and a second amount in the event the sign of the determined ratio is positive;

    incrementing (101) said previously computed wheel speed reference by the difference between the first amount and the second amount in the event the sign of the determined ratio is negative;

    incrementing (88) said wheel speed reference by a value (79) which changes said wheel speed reference toward a peak (75) of the m-slip curve thereby calculating an updated wheel speed reference, andutilizing (33) said updated wheel speed reference to control appropriately the braking system.

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