Brake pressure control apparatus

Details Brake pressure control apparatus Brake pressure control apparatus

1988-05-27

1989-03-07

Reger, Duane A.

Fluid-pressure and analogous brake systems

Pipeless valves

60545, 303114, B60T 894

Patent

active

048100420

ABSTRACT:
A brake pressure control apparatus comprises a master cylinder (2), an auxiliary hydraulic power source (10), a booster (3), a comparator member (30), an inlet valve (28), a pressure raising member (31) and a limiter member (32). The comparator member (30) determines whether a fluid pressure in a fluid path connecting a boost chamber of the booster (3) with wheel brakes (8 and 9) is lower than a predetermined value. The inlet valve (28) cuts off flow of the fluid toward the wheel brakes (8 and 9) when it is determined that the fluid pressure in the fluid path connecting the boost chamber with the wheel brakes (8 and 9) is lower than the predetermined value. The pressure raising member (31) raises a brake pressure to be applied to the wheel brakes (8 and 9), based on a fluid pressure from the master cylinder. The limiter member (32) limits operation of the pressure raising member (31). Thus, the pressure raising member (31) is enabled to operate only when the fluid pressure in the fluid path between the boost chamber and the inlet valve (28) is lower than the predetermined value at the time of cutoff by the inlet valve (28).

REFERENCES:
patent: 4637662 (1987-01-01), Brown
patent: 4641893 (1987-02-01), Sato et al.
patent: 4753490 (1988-06-01), Belart et al.
patent: 4761042 (1988-08-01), Seibert et al.

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