Railway vehicle brake system with improved blending control of p

Fluid-pressure and analogous brake systems – Multiple control – Fluid and electric

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303 3, 303 20, 330 86, B60T 1370, B60T 7554

Patent

active

046390472

ABSTRACT:
A railway vehicle brake control system in which a fluid pressure brake continuously supplements the electric brake as the electric brake effectiveness fades during vehicle slowdown. An amplifier circuit output signal corresponding to the electric brake effectiveness is modified by adjusting the amplifier gain in response to a detector sensing the initial drop in the electric brake effectiveness. This modified amplifer output signal is subtracted from a brake command signal to obtain a difference signal, the value of which establishes the amount of fluid pressure braking necessary to supplement the electric brake deficiency. The arrangement compensates for hysteresis and response delay in the pneumatic valving required in the fluid pressure brake system, such that the total brake obtained corresponds substantially to the brake command both during and following transition from the electric brake to the fluid pressure brake.

REFERENCES:
patent: 3868150 (1975-02-01), Maskery
patent: 3944287 (1976-03-01), Nagase
patent: 3974436 (1976-08-01), Timpe
patent: 4079334 (1978-03-01), Hamilton
patent: 4500845 (1985-02-01), Ehni

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