BACKUP CONTROL TECHNIQUE FOR 20 PIPE BRAKING SYSTEM

摘要

In a microprocessor-controlled electro-pneumatic brakecontrol system for a railway train, pressure in the brakecylinder is maintained despite the loss of pressure in the "20pipe" brake line, or failure of a key relay valve that controlspressure to that brake line. Feedback signals derived from the"20 pipe" brake line when found to be inappropriate after apredetermined amount of time are substituted for by brakecommand signals generated by the brake controller.