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AssigneeITT Industries, Inc.
InventorsJuan Belart, Jochen Burgdorf, Dieter Kircher, Lutz Weise
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A control arrangement for use in a hydraulic braking system equipped with an antiskid control device and an auxiliary energy source and including a master cylinder device which is operated in dependence on the travel of a brake pedal, includes normally open separating valves in braking conduits to the wheel brake actuating cylinders, which close during antiskid control operation, provided that auxiliary energy is available. An auxiliary supply conduit supplies the auxiliary energy to the wheel brake actuating cylinders so that the latter can be operated in a dynamic manner. A normally closed return valve is interposed in the return conduit from the respective wheel brake actuating cylinders and can be opened, either directly or indirectly, by the auxiliary energy during the antiskid control operation, so that the pressure from the wheel brake operating cylinder to be controlled can be relieved to the low-pressure supply reservoir while rendering static operation of the wheel brake actuating cylinders possible in its normal closed position assumed when no antiskid control action is needed. The pressure of the auxiliary energy hydraulic fluid can be generated by a hydraulic pump which is operated only during the antiskid control action, or the auxiliary energy supply system can be operated on a continuous basis, in which case the auxiliary hydraulic fluid is supplied to the hydraulic braking circuit only when the need for an antiskid control action arises.
A control arrangement for use in hydraulic braking system of a vehicle, particularly of a motor vehicle, equipped with an antiskid control device, for controlling the operation of at least one brake actuating cylinder interposed in a braking circuit between a supply conduit having a first and a second branch respectively communicating with a master cylinder device having at least one master piston and with an auxiliary energy pressure source at their upstream ends and merging with one another upstream of the brake actuating cylinder, said auxiliary pressure source responsive to antiskid control action for generating elevated hydraulic pressure and a return conduit connected to a supply reservoir at its downstream end, in dependence on the operation of the antiskid control device and of the auxiliary energy source, the invention comprising:
The control arrangement as defined in claim 24, wherein said return port includes a passage in the master piston having an end facing toward the brake pedal and means for communicating said passage with the supply reservoir;
Dependencies are inferred from the claim text.