Estimating road friction coefficient

Details Estimating road friction coefficient Estimating road friction coefficient

1991-02-13

1992-06-23

Peters, Jr., Joseph F.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303105, 303103, 36442602, B60T 866

Patent

active

051237156

ABSTRACT:
A road surface friction coefficient estimating method and apparatus in an anti-lock control device for preventing locking of vehicle wheels during braking. The road surface friction coefficient is estimated by comparing a deceleration of an estimated vehicle speed with a predetermined threshold value. The predetermined threshold value has different road surface friction coefficient values corresponding to different vehicle deceleration values. The braking hydraulic pressure is then repeatedly varied in accordance with signals indicative of the estimated road surface friction coefficient, signals indicative of the estimated vehicle speed, and one of the signals indicative of the slowest rear wheel speed and the front wheel speeds.

REFERENCES:
patent: 4321677 (1982-03-01), Takahashi
patent: 4384330 (1983-05-01), Matsuda
patent: 4693522 (1987-09-01), Wapper
patent: 4825367 (1989-08-01), Nagaoka
patent: 4855917 (1989-08-01), Sawano
patent: 4883325 (1989-11-01), Shimanuki
patent: 5033799 (1991-07-01), Braschel

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