Brake control system having an electro-pneumatic pilot valve

Details Brake control system having an electro-pneumatic pilot valve Brake control system having an electro-pneumatic pilot valve

1977-07-28

1978-06-13

Kunin, Stephen G.

Fluid-pressure and analogous brake systems

Multiple systems

Fluid pressure and electric

B60T 712

Patent

active

040945537

ABSTRACT:
An electro-pneumatic pilot valve device is operably connected to a relay valve device for governing fluid pressure control of friction brakes of a vehicle in accordance with at least one variable analog signal input to the pilot valve device. The electro-pneumatic pilot valve device has a differential piston assembly comprising a valve plunger having ball valves disposed coaxially thereon and input, vent, and pilot chambers associated with the valves wherein one of the valves selectively connects the input chamber to the pilot chamber, and another valve selectively connects the pilot chamber to the vent chamber. A linear torque motor is governed by a variable input electrical signal for selectively applying a force axially to the plunger to vent fluid from the pilot chamber to atmosphere through the vent chamber. A balance of forces acting on the plunger permits operation of the valves to a lap position.

REFERENCES:
patent: 3275380 (1966-09-01), May
patent: 3536360 (1970-10-01), Engle
patent: 3536361 (1970-10-01), Engle
patent: 3814483 (1974-06-01), Coiner et al.
patent: 3857614 (1974-12-01), Kurichh
patent: 3880476 (1975-04-01), Belart et al.
patent: 3924902 (1975-12-01), Engle
patent: 4021079 (1977-05-01), Bohusch

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