Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-09-02
1989-05-09
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303111, 303112, 36442602, B60T 858
Patent
active
048283347
ABSTRACT:
A wheel lock control system in which when an incipient wheel lockup condition is first sensed, the brake pressure at that time is used to estimate a brake pressure value that is substantially equal to but greater than the brake pressure required to produce an incipient wheel lockup condition. The brake pressure is then dumped to allow wheel speed recovery. Following wheel speed recovery, the estimated brake pressure is applied to the wheel brake. At the same time, the brake torque tending to accelerate the wheel is computed by an expression taking into consideration the rate of change in wheel speed as the brake pressure is reapplied. When a peak brake torque value is identified, the optimum brake pressure that will result in the identified peak brake force is determined from the same expression used to calculate the brake torque but with the term associated with the rate of change in wheel speed being eliminated. The pressure to the wheel brake is then established to produce the optimum brake pressure and the wheel-to-vehicle speed ratio that existed at the time the peak brake torque was identified.
REFERENCES:
patent: 4653816 (1987-03-01), Lin
patent: 4664453 (1985-10-01), Kade et al.
patent: 4750124 (1988-06-01), Lin et al.
patent: 4755946 (1988-07-01), Lin
Conkey Howard N.
General Motors Corporation
Reger Duane A.
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