B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
B60T 13/66 (2006.01) B60T 15/14 (2006.01) B61C 17/12 (2006.01) B61H 13/00 (2006.01)
Patent
CA 2145381
A microprocessor based electro-pneumatic brake control system for a railway train including both an automatic brake control system and an independent brake control system in which the independent brake control system includes an application electro-pneumatic valve means to control application of air pressure to locomotive brake cylinders in response to an application brake control signal and a release electro-pneumatic valve means to control release of air pressure from such locomotive brake cylinders in response to a release brake control signal. The application electro-pneumatic valve means is biased to a normally closed position, in the absence of such application brake control signal thereto, to prevent venting of application air pressure from the locomotive brake cylinders in the event of a power failure, while the release electro-pneumatic valve means is biased to a normally open position, in the absence of such release brake control signal thereto, to prevent trapping of air pressure in the locomotive brake cylinders in the event of a power failure. In addition, the release electro-pneumatic valve means is provided with a restricted outlet port to retard exhaust of air from the locomotive brake cylinders in the event of a power failure following a brake application. On brake control systems also having an mu valve to cut-off the independent brake control system in a dead locomotive in a consist, the mu valve is biased to normally be in a closed position to prevent venting of application air pressure via the mu valve in the event of a power failure.
Macrae & Co.
Westinghouse Air Brake Company
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