Fluid-pressure and analogous brake systems – With pump
Patent
1989-05-17
1990-07-03
Butler, Douglas C.
Fluid-pressure and analogous brake systems
With pump
303 13, 303 14, 303116, 303119, 303 50, 303114, 188358, B60T 832, B60T 848, B60T 1316
Patent
active
049385410
ABSTRACT:
A vehicle hydraulic braking system for applying the wheel brakes of an automotive vehicle comprising: a reservoir for holding a hydraulic brake fluid; a pump fluidly connected with the reservoir for pressurizing the fluid; at least one first valve fluidly connected with the pressurized fluid from the pump and the first valve being connected with a modulation sump, the first valve delivering a modulated brake pressure to at least one wheel brake at a ratio of the master cylinder pressure to the wheel pressure so long as the fluid pressure from the pump is above a predetermined value; and a second valve fluidly connected with the wheel brake, the master cylinder, the modulated brake pressure, and with the pump and, whereby the second valve isolates the master cylinder from the wheel brake when the pump pressure is above a predetermined value delivering modulated pressure to the wheel brake and when the pump pressure is below a predetermined value the second valve connects the master cylinder with the wheel brake.
REFERENCES:
patent: 4778226 (1988-10-01), Brown
patent: 4812777 (1989-03-01), Shirai
patent: 4826255 (1989-05-01), Volz
Schenk Donald E.
Shaw Schuyler S.
Butler Douglas C.
General Motors Corporation
Helms Ernest E.
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