Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-07-17
2000-05-23
Schwartz, Christopher P.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
417494, 417501, 417254, B60T 840
Patent
active
060658169
ABSTRACT:
A brake control apparatus includes a reservoir tank, a master cylinder fluidly connected to the reservoir tank, a wheel cylinder fluidly connected to the master cylinder via a main passage. An auxiliary passage communicates the reservoir tank with the main passage. A pump unit including main and auxiliary pumps coupled in series is disposed in the auxiliary passage. The main pump includes a pump chamber communicated with a delivery port of the auxiliary pump. A return passage communicates the main passage with the main pump. Valves within the main and auxiliary passages, and the pump unit are responsive to a wheel slip control signal from a controller to permit a fluid flow to the wheel cylinder and prevent a fluid flow into the return passage. A supply valve within the main passage, a discharge valve within the return passage, and the pump unit are responsive to a wheel lockup control signal from the controller to permit a fluid flow from the wheel cylinder to the return passage.
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Schwartz Christopher P.
Unisia Jecs Corporation
Williams Thomas J.
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