Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1979-07-17
1981-07-14
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303116, B60T 802, B60T 1128
Patent
active
042783003
ABSTRACT:
The invention comprises an anti-lock braking circuit of the kind which incorporates a modulation device between the master cylinder and the slave sylinder of the respective wheel. The modulation device is controlled by a pickup sensitive to wheel locking and comprises an isolation valve which in its normally open position establishes communication between the master cylinder and the slave cylinder, and a pressure drop regulation valve which can establish communication between the slave cylinder and a discharge. When locking of a wheel is sensed by the pickup, the isolation valve is closed and the pressure drop regulation valve is opened to connect the slave cylinder to the discharge, thereby reducing the braking force applied to the respective wheel. According to the invention, the modulation device incorporates a high-pressure accumulator and a pump for pressurizing the accumulator, and a non-return valve is provided to prevent fluid flow from the modulation device to the master cylinder, whereby during intervention of the modulation device the necessary fluid pressure for the slave cylinder is provided by the accumulator and the master cylinder is isolated from the modulation device so that undesirable variations in pressure on the brake pedal are avoided.
REFERENCES:
patent: 3549212 (1970-12-01), Leiber
patent: 3639009 (1972-02-01), Klein et al.
patent: 3847449 (1974-11-01), Adahan
patent: 4033637 (1977-07-01), Leiber
patent: 4155604 (1979-05-01), Fenart
Brown Charles E.
Butler Douglas C.
Societe Anonyme Francaise du Ferodo
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