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Estimating road friction coefficient

  • US 5,123,715 A
  • Filed: 02/13/1991
  • Issued: 06/23/1992
  • Est. Priority Date: 02/16/1990
  • Status: Expired due to Term
First Claim
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1. An anti-lock control method of preventing locking of vehicle wheels during braking, said method comprising the steps of:

  • setting an estimated vehicle speed based on a highest wheel speed among wheel speeds of all said vehicle wheels;

    setting at least one threshold value each representing a predetermined road surface friction coefficient;

    calculating a deceleration of said estimated vehicle speed;

    estimating said road surface friction coefficient by comparing said deceleration with each of said threshold values and obtaining an estimated road surface friction coefficient; and

    repeatedly varying braking hydraulic pressure in accordance with electric signals indicative of a value of said estimated road surface friction coefficient.

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