Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1997-01-14
1998-03-24
Ballato, Josie
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303 86, 303 15, 303 29, 36442601, B60T 1370
Patent
active
057305048
ABSTRACT:
An electro-pneumatic brake control system for a railroad freight car comprises application and release solenoid valves controlled by a microprocessor overlayed with the conventional car automatic pneumatic brake control system, including control for bleeding off auxiliary reservoir pressure at least during a power failure mode of operation during which the pneumatic brakes become effective to apply the car brakes in response to an induced brake pipe pressure reduction in the course of indirectly supplying brake pressure on cars having operable electro-pneumatic brakes. The bleed of auxiliary reservoir air pressure allows a subsequent slow recharge of the brake pipe pressure to create a positive release pressure differential across the control valve service piston to assure a brake release of the automatic pneumatic brake application to obviate a "stuck brake" condition on a car experiencing an electro-pneumatic power failure.
REFERENCES:
patent: 4978179 (1990-12-01), Balukin
patent: 5393129 (1995-02-01), Troiani et al.
patent: 5503467 (1996-04-01), Gaughan
Ballato Josie
Falce G. J.
Westinghouse Air Brake Company
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