Fluid control device and braking system

Details Fluid control device and braking system Fluid control device and braking system

1989-05-23

1991-05-14

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 61, 303113, 303115, B60T 1368

Patent

active

050150464

ABSTRACT:
A fluid control device for a braking system has a fluid flow path between an inlet port (9) and an outlet port (10) controlled by a first valve (17,18), and a fluid flow path between the outlet port (10) and an exhaust port (11,12) controlled by a second valve (20,22) and a stepper motor (30) actuated by an electronic controller (2) for driving a valve control piston (22) to which a pilot inlet pressure is applied (23) according to driver braking demand (5A). The stepper motor (30) and pilot inlet pressure act in parallel on piston (22) to control operation of the valves and thereby regulate braking. The stepper motor may operate in response to one or more vehicle operational parameters (A,B,C,D) fed to the controller (7).

REFERENCES:
patent: 2919162 (1959-12-01), Roberts
patent: 3768519 (1973-10-01), Morse
patent: 3854501 (1974-12-01), Machek
patent: 3881779 (1975-05-01), Machek
patent: 3920046 (1975-11-01), Morse et al.
patent: 4580849 (1986-04-01), Farr
patent: 4811994 (1989-03-01), Friedow
patent: 4838622 (1989-06-01), Kircher et al.

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