Patent ID: 7370917
Filing Date: 2008-05-13
Classification: B60T

Abstract:
1. A braking system for a trailer vehicle which comprises: an electro-pneumatic braking system provided in the trailer vehicle and including: a control input for a control pressure the value of which is indicative of a desired braking pressure to be applied to braking elements of the vehicle; a supply inlet for connection to a pressure source of the vehicle, first and second outputs respectively for connection to the braking elements associated with the left and right side respectively of the vehicle; first and second pneumatically controlled relay valves disposed between said supply inlet and said first and second outputs respectively, and having respective pneumatic control inputs; first and second solenoid-operated on/off valves connected between the control input of first and second relay valves respectively, and a single, common pneumatic duct, and each operable, in a first and a second condition, respectively, to allow and prevent connection of the control input of the corresponding relay valve to said common pneumatic duct; a first solenoid-operated switching valve having first and second conditions, respectively, in which it couples said common pneumatic duct to the control input and to an inlet/outlet aperture of a normally closed second solenoid-operated switching valve, respectively, said second solenoid-operated switching valve having first and second conditions respectively in which its inlet/outlet aperture is coupled to a discharge passage opening to the outside environment and to said supply inlet, respectively; and