Trailer control valve and method for controlling a trailer brake pressure

A trailer control valve (300) for a towing vehicle configured to be coupled to a trailer, the trailer control valve comprising:

• a pneumatic input port (310) configured to receive a control pressure (101);
• an electronic input port (320) configured to receive an electronic brake signal (150);
• a pressure sensor (330);
• a relay valve relay valve (340) including a control port (345);
• a first solenoid valve (350) and a second solenoid valve (360);
• a pressure supply port (370);
• and
• a trailer coupling terminal (380) configured to provide a brake pressure and/or a supply pressure to the trailer,
• wherein the first solenoid valve (350) and the second solenoid valve (360) are configured
• to forward, in a primary mode, the control pressure (101) to the control port (345) of the relay valve (340), and
• to interrupt, in a secondary mode, the control pressure (101) and to connect the control port (345) of the relay valve (340) to the pressure supply port (370) as a function of the electronic brake signal (150) and of an actual pressure sensed by the pressure sensor (330).