Electronically controlled pneumatic brake system comprising an electronically controlled trailer control module

An electronically controlled pneumatic brake system (2) for a vehicle (100), in particular a commercial vehicle (200), comprising:

• a first brake circuit (4) including a first brake actuator (20a) and a second brake actuators (20b),
• a second brake circuit (6) including a third brake actuator (20c) and a fourth brake actuator (20d),
• a first compressed air supply (10), and
• a trailer control circuit (8) comprising a supply coupling head (24) and a control coupling head (26), and
• an electronically controlled trailer control module (28), comprising:
• a first supply port (28.1) for receiving supply pressure (pS) from the first compressed air supply (10),
• a trailer supply connection (28.2) for providing a trailer supply pressure (pT) at the supply coupling head (24),
• a trailer control connection (28.3) for providing a trailer control pressure (pB) at the control coupling head (26),
• an electro-pneumatic trailer control valve arrangement (40) in fluid connection with the first supply port (28.1) for receiving the supply pressure (pS) and adapted to provide the trailer control pressure (pB) at the trailer control connection (28.3), and
• an electronic trailer control unit (42) for controlling the electro-pneumatic trailer control valve arrangement (40) such that the trailer control pressure (pB) can be modulated,
• wherein the electro-pneumatic trailer control valve arrangement (40) is configured to provide the trailer control pressure (pB) at the trailer control connection (28.3) only while the supply pressure (pS) is supplied to the trailer supply connection (28.2).