Brake fluid pressure control apparatus

Details Brake fluid pressure control apparatus Brake fluid pressure control apparatus

1997-10-20

1999-03-30

Young, Lee W.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 11, 3031132, B60T 840

Patent

active

058879552

ABSTRACT:
A dual function brake fluid control apparatus is presented for performing antiskid operation as well as another control operation involving control of the fluid pressure when the apparatus is not performing an antiskid operation. The apparatus is provided with a pressure relief valve having a valve body and a piston. The relief valve is forced closed by a biasing spring acting on a valve body, and when in the open state relieves the discharge pressure of a pump to the intake side of the pump. The piston closes the relief valve when the fluid pressure from the master cylinder exceeds a specific value. This configuration allows setting the discharge fluid pressure of the pump to apply fluid pressure to the wheel cylinders for non-antiskid control operations higher than that for the antiskid control operation. During an antiskid control operation, the fluid pressure relief valve also allows to maintain the discharge fluid pressure of the pump at the same value as or higher than the fluid pressure generated in the master cylinder.

REFERENCES:
patent: 4123118 (1978-10-01), Sato
patent: 4783125 (1988-11-01), Belart et al.
patent: 5190362 (1993-03-01), Schaefer et al.
patent: 5248190 (1993-09-01), Sato et al.
patent: 5303990 (1994-04-01), Ando et al.
patent: 5330258 (1994-07-01), Hoshoya et al.

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