Hydraulic brake system for vehicles

Details Hydraulic brake system for vehicles Hydraulic brake system for vehicles

1990-06-22

1991-08-13

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Pipeless valves

303116, 303119, 303DIG3, 303DIG4, B60T 832, B60T 860, B60T 1312, B60T 1368

Patent

active

050391755

ABSTRACT:
A hydraulic brake system for a vehicle including, brake pressure modulators that prevent the locking of vehicle wheels caused by excessively high braking pressures. Such brake pressure modulators include brake line blocking valves and cylinders with pistons, where upon piston displacement, pressure fluid escapes from the wheel brakes to lower the brake pressure. The displacements of the pistons are controlled via valve assemblies that are connected to a servo pressure source. Failure of the servo pressure source, if there is even a small leak of a valve assembly, can lead to at least partial loss of a brake force during a braking event. To recognize and indicate any leak that might be present, a control unit which acts upon the valve assemblies is arranged such that it directs the valve assemblies into various switching positions and in this process, via a pressure sensor, observes whether logically observed pressures are varying impermissibly.

REFERENCES:
patent: 3948568 (1976-04-01), Leiber
patent: 4484784 (1984-11-01), Leiber
patent: 4824182 (1989-04-01), Steffes et al.
patent: 4869558 (1989-09-01), Yoshino
Prospectus of "Sumitomo Electric's Anti-Lock Related Products", no date.

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