Electropneumatic brake control system for railway transit vehicl

Details Electropneumatic brake control system for railway transit vehicl Electropneumatic brake control system for railway transit vehicl

1985-06-17

1986-07-08

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple systems

Fluid pressure and electric

303 15, 303 22R, 303 36, 303 38, 303 71, 303 92, 303100, 303 20, B60T 802, B60T 858, B60T 1374

Patent

active

045989532

ABSTRACT:
An electropneumatic brake system for a railway vehicle having an electronic control unit that outputs a friction brake demand signal according to the difference between a brake command signal and a feedback signal representative of the effective dynamic brake, whereby the total dynamic and friction brake effort corresponds to the brake command signal. The brake system also includes a pneumatic operating unit having a pair of high-capacity, electropneumatic valves operated by the friction brake demand signal to regulate the pneumatic pressure at the brake unit directly, that is, without an intermediary relay valve. Such an arrangement provides better response and more accurate pressure feedback of the friction brake level to the electronic control unit. A service rate control choke is located ahead of the electropneumatic valves, which allows these valves to perform the emergency and wheel-slip control functions without requiring independent valves for this purpose, by virtue of their high-capacity capability.

REFERENCES:
patent: 3398815 (1968-08-01), Brath et al.
patent: 3398993 (1968-08-01), Sarbach et al.
patent: 3490814 (1970-01-01), Smith et al.
patent: 4045093 (1977-08-01), Bridigum
patent: 4199195 (1980-04-01), Pekarcik et al.
patent: 4533185 (1985-08-01), Krause
WABCO Instruction Pamphlet G-g-2616-1, Jun. 1969, Wilmerding, Pa., entitled "RT-5A Brake Equipment".

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