Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1996-07-09
1998-08-04
Young, Lee W.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303 15, 303 81, B60T 1126
Patent
active
057883386
ABSTRACT:
A regulating valve device is provided for utilization with an end-of-train unit in order to reduce a train brake pipe pressure from the rear end in accordance with a pressure reduction initiated at the locomotive on the front end. A stepping motor under control of a microprocessor controls the compression of a spring to establish a target pressure corresponding to a pressure command signal transmitted from the locomotive to the end-of-train unit. The service exhaust valve device regulates the brake pipe pressure to the target pressure corresponding to the spring compression set by the stepping motor and includes an arrangement for overriding the motor control in the event of a fault condition that prevents the motor from resetting the spring to its initial compression when it is desired to recharge the brake pipe to release a brake application.
REFERENCES:
patent: 5332297 (1994-07-01), Cunkelman et al.
patent: 5383717 (1995-01-01), Fernandez et al.
patent: 5494342 (1996-02-01), Engle
patent: 5564794 (1996-10-01), Hart
patent: 5638276 (1997-06-01), Hart
Hart James E.
Sich Gary M.
Falce Gary J.
Westinghouse Air Brake Company
Young Lee W.
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