Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-03-13
1990-07-03
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
13759617, 303 842, F16B 1344, B60T 836
Patent
active
049385453
ABSTRACT:
An anti-lock braking system (ABS) solenoid/isolation valve integration is provided. When ABS is entered, the ABS supply pump is turned on and the solenoid normally open port is closed to prevent fluid from entering the wheel brake area from either the master cylinder or pump. The normally closed valve is then energized (opened) which releases pressure from the wheel causing a pressure drop across the isolation valve. The above causes the isolation valve to move closing a ball seat valve which isolates the master cylinder (pedal) from the wheel (pump, solenoid, etc.). The actual movement of the isolation valve is caused by the pressure generated by the pump.
REFERENCES:
patent: 3989063 (1976-11-01), Brouwers et al.
patent: 4668024 (1987-05-01), Nakanishi et al.
patent: 4679589 (1987-07-01), Inden et al.
patent: 4765693 (1988-08-01), Stegmaier
patent: 4768843 (1988-09-01), Baughman
patent: 4778227 (1988-10-01), Bayliss
patent: 4789208 (1988-12-01), Kohno
patent: 4821770 (1989-04-01), Parrott et al.
DeHoff Edward J.
Schenk Donald E.
Shuey Lyle W.
Butler Douglas C.
General Motors Corporation
Graham Matthew C.
Helms Ernest E.
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