Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1976-12-22
1978-02-07
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 92, B60T 810
Patent
active
040723666
ABSTRACT:
A hydraulic braking system for vehicles having front and rear wheel brakes energized from a master cylinder and wherein energization of the rear wheel brakes is interrupted by a cut-off valve which closes in response to a signal indicating a skid condition. The cut-off valve is normally held open by pressure from a fluid pressure source controlled by an actuator and is opposed by master cylinder pressure. The skid condition signal causes the sourced pressure to the cut-off valve to lower and the valve to close. The controlled pressure from the fluid pressure source to the cut-off valve is at least a predetermined minimum value to prevent unintended or premature valve closure, and an optimum ratio of that pressure to master cylinder pressure for increasing values of master cylinder pressure is maintained for stability of the system. Furthermore, this system can include a fail-safe valve operable to provide for brake energization in the event of failure of pressure from the pressure source.
REFERENCES:
patent: 3514161 (1970-05-01), Frayer
patent: 3666328 (1972-05-01), Williams
patent: 3671085 (1972-06-01), Pasek et al.
patent: 3871717 (1975-03-01), Jensen
patent: 3922021 (1975-11-01), Every
patent: 3926480 (1975-12-01), Shibatani et al.
Aisin Seiki Kabushiki Kaisha
Reger Duane A.
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