Electromechanical parking brake having a redundant subsystem for applying a second parking brake in the event of failure

摘要

An electromechanical parking brake system for a heavy vehicle braked by air-actuated service brakes, the system comprising an EPB-ECU 172a and a first electromechanical parking brake actuator controlled 176a and b by the EPB-ECU 172a, the system further comprising a redundant sub-system for applying a second parking brake 168c and d in the event of a failure in the EPB-ECU 172a or electromechanical parking brake actuator 176a and b. An electromechanical parking brake system having a test mode in which the controller signals release of the brake on the trailer and maintains or applies a parking brake on the tractor unit so a vehicle user can determine whether the tractor unit parking brake is alone capable of holding the tractor and trailer; is also disclosed.