Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-08-09
1992-04-21
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
36442602, 303110, B60T 858
Patent
active
051061716
ABSTRACT:
The current to the motor of a motor driven pressure modulator of an antilock brake system is controlled at a high value in response to a sensed incipient wheel lock condition so as to rapidly release the brake pressure for a calibrated time period that is a function of wheel parameters to reduce brake pressure by an amount determined to effect a recovery from the incipient wheel lock condition under normal antilock controlled braking. After the calibrated time period, the motor is braked so as to quickly halt its rotation and therefore the rapid pressure reduction by applying a motor brake current to the motor by controlling the motor current in the pressure apply direction. The duration of this rapid reduction of brake pressure and therefore the amount of pressure reduction is independent of a sensed recovery condition of the wheel and is based solely on an open loop calibration value determined to effect wheel recovery from the incipient wheel lock condition.
REFERENCES:
patent: 4576417 (1986-03-01), Dobner
patent: 4664453 (1987-05-01), Kade et al.
patent: 4750124 (1988-06-01), Lin et al.
patent: 4755946 (1988-07-01), Lin
patent: 4756391 (1988-07-01), Agarwal et al.
patent: 4781741 (1988-08-01), Agarwal et al.
patent: 4807134 (1989-02-01), Agarwal et al.
Hogan Martin A.
Leppek Kevin G.
Spadafora Peter J.
Conkey Howard N.
Delco Electronics Corp.
General Motors Corporation
Graham Matthew C.
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