Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-10-18
1989-09-26
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 61, 303114, 303115, 303119, B60T 832, B60T 842, B60T 844
Patent
active
048695599
ABSTRACT:
In a brake-slip-controlled automotive vehicle brake system, a pedal-operated master cylinder is provided which applies hydraulic fluid to the wheel brake circuits via at least one braking pressure modulator and via one electromagnetically operated closing valve at a time. The pressure modulator comprises a volume receiver and a pneumatic piston-and-cylinder arrangement acting on the volume receiver and connected with a vacuum source and a pressure source via a change-over valve actuated by a brake slip control circuit. Inserted into each hydraulic line between the master cylinder and the pressure modulator is an electromagnetically operated pilot valve having a normal operating position and a suction position. A traction slip control circuit switches the pilot valves over upon the occurrence of traction slip and ensures that the pressure modulator is reversed to the direction of increasing volume admission. Subsequently, the return spring, tensioned during this reversal, and the atmospheric pressure will, by a new reversal of the change-over valve, be made use of for a pressure build-up in the wheel brake cylinder of the wheel showing traction slip.
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Alfred Teves GmbH
Butler Douglas C.
Raden James B.
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