Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-12-13
1989-12-12
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181R, 303 96, 303 97, 303100, 303106, 303108, 303110, 303119, 36442602, B60T 866
Patent
active
048863220
ABSTRACT:
The present invention concerns a vehicle anti-lock brake control system which does not require the use of an auxiliary hydraulic pump and, in the preferred embodiment, is adapted to control only the rear brakes of a four-wheel vehicle. The control system includes a normally open solenoid actuated isolation valve connected between the master cylinder and the rear wheel brakes, and a normally closed solenoid actuated dump valve connected between the rear wheel brakes and a fluid accumulator. A computer control is connected to monitor the rear wheel speed and deceleration and, during braking of the vehicle, functions to control the application of hydraulic pressure to the rear brakes via the isolation and dump valves in order to correct wheel speed departures and prevent lock-up of the brakes. The computer control is adapted to detect a low to high mu road surface change which occurs during a wheel speed departure, and thereafter applies additional pressure to the rear brakes by selectively opening the isolation valve. Further, the control is adapted to detect when one of the rear wheels remains locked after anti-lock measures have been taken. In these instances, the standard operating parameters which control the reapplication of additional pressure are modified.
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Butler Douglas C.
Kelsey Hayes Company
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