Patent ID: 6213565
Filing Date: 2001-04-10
Classification: B60T

Abstract:
A brake control valve for a freight car having a brake pipe, auxiliary and emergency reservoirs normally charged with pressurized fluid from said brake pipe, a fluid pressure activated brake cylinder device and an exhaust, said brake control valve comprising:a. a electronic controller;b. at least one pressure sensor, said at least one pressure sensor detecting pressure in said brake pipe and communicating such pressure to said electronic controller;c. a plurality of electrically operated valves controlled by said electronic controller selectively communicating at least said brake cylinder with one of said reservoirs and the atmosphere thereby performing braking and release functions;d. at least one of said plurality of electrically operated valves being a quick service valve, said quick service valve controlled to selectively connect said brake pipe to said exhaust;e. said electronic controller responding to changes in brake pipe pressure complying with predetermined conditions indicative of pneumatic brake command signals;f. said electronic controller responding to reductions in brake pipe pressure by controlling said quick service valve to produce a predetermined pressure drop in said brake pipe;g. said electronic controller determining a rate of pressure reduction in brake pipe pressure; andh. said electronic controller adjusting said predetermined pressure drop in said brake pipe responsive to said rate of pressure reduction in brake pipe pressure being less than a preselected rate to assist propagation of a pneumatic brake command through said brake pipe providing quick service.