Hydraulic braking system featuring selectable increased pump...

Details Hydraulic braking system featuring selectable increased pump... Hydraulic braking system featuring selectable increased pump...

Filed on

2005-05-24

Date issued

2005-05-24

Examiner

Williams, Thomas (Department: 3683)

Patent Class

Fluid-pressure and analogous brake systems

SubClass

Speed-controlled

SubSubClass

Having a valve system responsive to a wheel lock signal

Other Related Categories

C303S122090, C303S113100, C303S009000

Type

Reexamination Certificate

Status

active

Patent number

06896338

Description

ABSTRACT:
An automotive braking system controls the flow of pressurized brake fluid from a tandem master cylinder to several wheel brakes via a pair of braking circuits. Each circuit features a pressure relief line having, in series, a normally-closed valve, low-pressure accumulator, pump, check valve, damping chamber, and throttling orifice. A bypass line includes a normally-closed bypass valve that is operated to interconnect the pressure relief lines of the first and second braking circuits downstream of the pump outlets to thereby reduce system response time when, for example, one or more wheel brakes are actuated to enhance vehicle traction or stability. Braking system redundancy is enhanced with a check valve incorporated in either or both circuits downstream of the bypass connection, or a second normally-closed bypass valve in the bypass line. Fluid pressure monitoring in either or both circuits is further useful in identifying bypass valve leakage.

REFERENCES:
patent: 4824183 (1989-04-01), Uchida et al.
patent: 5540488 (1996-07-01), Terazawa et al.
patent: 6120111 (2000-09-01), Sakai

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