Electrically controlled fluid brake system

Details Electrically controlled fluid brake system Electrically controlled fluid brake system

1977-08-12

1978-12-26

Kunin, Stephen G.

Fluid-pressure and analogous brake systems

Pipeless valves

244111, B60T 800

Patent

active

041313259

ABSTRACT:
A vehicle braking system employs a fluid pressure operated device for engaging the brakes. Flow of liquid under pressure to this device is controlled by a solenoid inlet valve and escape of fluid is controlled by a solenoid outlet valve both of which are normally closed. A demand signal and a feedback signal representing the degree to which brake operation has been achieved are fed to a comparator circuit and the valves are energized in accordance with the sign of the error signal. Operation of the respective means for controlling the operation of the respective valves is obtained by a pulse train generator, and a pair of pulse width modulating means, connected to the respective valves for modifying the mark-space ratio of the pulse train.

REFERENCES:
patent: 3402972 (1968-09-01), Cooper et al.
patent: 3827760 (1974-08-01), Fleagle
patent: 3909075 (1975-09-01), Pittet, Jr. et al.
patent: 3910646 (1975-10-01), Grix

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