Fluid-pressure and analogous brake systems – With pump – Pressure control
Patent
1991-05-31
1994-03-29
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
With pump
Pressure control
303DIG2, 303DIG3, 303 20, 303 3, 303 841, 303 87, 3031134, B60T 1318
Patent
active
052978575
ABSTRACT:
A system and method of controlling pressure in a wheel brake cylinder of a brake. The hydraulic cylinder is connected to an electrically driven pump and a flow control valve is connected between the pump and the wheel cylinder. The system and method operate to control the speed of a motor driven pump to generate a desired pressure in a cylinder of the brake; generate a differential pressure, in the flow control valve, proportional to pump flow and communication same to a spring biased valving element; cause the valving element to move, in response to pressure forces acting on the valving element, generated by the pressure differential, and the force of the bias spring, so as to selectively open and close an associated exhaust port, connected to a drain or sump, such that in the steady state an equilibrium condition is achieved where the pressure forces balance the spring force and the pressure in the hydraulic cylinder is constant.
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Casey Gary L.
Patient Daniel J.
Allied-Signal Inc.
Oberleitner Robert J.
Seitzman Markell
Young Lee W.
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