Vehicle wheel controlled anti-brake lock braking arrangement

Details Vehicle wheel controlled anti-brake lock braking arrangement Vehicle wheel controlled anti-brake lock braking arrangement

1984-06-14

1986-03-11

Reger, Duane A.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303114, B60T 810

Patent

active

045751609

ABSTRACT:
To provide for change in application of pressure rate, or pressure gradient, in a simplified control system, a group of shunt valves (36-39; 51, 52), which are normally open, are hydraulically connected in parallel to at least one of the brake fluid control valves (8-11; 43, 44, 45) which receive, hold, or drain pressurized brake fluid from main brake cylinders (2, 3) under command of an automatic braking system evaluation stage or unit (ABS) in accordance with sensed wheel speed, acceleration or deceleration, to apply additional pressurized brake fluid to the brake associated with the wheels. The brake fluid control valves (8-11; 43, 44, 45) include chokes, or have inherent choking action, in their hydraulic path which is bypassed by the shunt valves. Operation of the shunt valves, including a brake fluid feed control valve (12; 48) is controlled by a single electromagnet which is, in turn, controlled by the pressure within the main braking cylinders (2, 3) and/or position of the brake control pedal, so that the pressure gradient or build-up within the brake cylinders of the wheels is either directly controlled through the shunt path through the shunt valves, or through the brake fluid control valves (8-11; 43-45) under control of the ABS unit, the feed valves supplying additional pressurized brake fluid to the respective brake circuits to prevent exhaustion thereof. Preferably, the shunt valves and the feed valve are placed in a common valve block.

REFERENCES:
patent: 3999809 (1976-12-01), Inada et al.
patent: 4093317 (1978-06-01), Lindemann et al.
patent: 4320459 (1982-03-01), Lindemann et al.

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