Fluid-pressure and analogous brake systems – Miscellaneous operations on control pipe
Patent
1998-05-29
1999-10-19
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Miscellaneous operations on control pipe
303 15, 303 20, B60T 1368
Patent
active
059676221
ABSTRACT:
In a locomotive braking system, an independent brake control circuit uses second control signal(s) to adjust pressure in a first reservoir. A microprocessor derives the second control signal(s) based on at least a first control signal indicative of brake handle position and first feedback indicative of first reservoir pressure. One pneumatic relay adjusts pressure in a 20 pipe based on first reservoir pressure. An automatic brake control circuit uses third control signal(s) to adjust pressure in a second reservoir. The microprocessor derives the third control signal(s) based on at least second feedback indicative of second reservoir pressure and third feedback indicative of pressure in a 20 pipe. Another pneumatic relay controls pressure in a brake cylinder based on whichever of at least the 20 pipe and the second reservoir delivers a highest pressure. A new system for backup control of the 20 pipe includes the microprocessor and a timer. By monitoring the third feedback, the microprocessor determines when 20 pipe pressure falls outside a predetermined range. When the microprocessor begins to monitor the third feedback, the timer activates for a predetermined time. After the predetermined time expires, the microprocessor uses (A) the third feedback in derivation of the third control signal(s) if 20 pipe pressure falls within range and (B) the first control signal as a substitute for a difference between the first control signal and the third feedback in derivation of the third control signal(s) if 20 pipe pressure falls outside range or fails to be read.
REFERENCES:
patent: 5222788 (1993-06-01), Dimsa et al.
Dimsa Robert D.
Ferri Vincent
Butler Douglas C.
Westinghouse Air Brake Company
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