US 12,330,603 B2
Automatic selectable trailer connection
Lionel Farres, Heyrieux (FR); and Mattias Holmberg, Jamestown, NC (US)
Assigned to Volvo Truck Corporation, Gothenburg (SE)
Appl. No. 17/798,987
Filed by Volvo Truck Corporation, Gothenburg (SE)
PCT Filed Feb. 18, 2020, PCT No. PCT/EP2020/054258
§ 371(c)(1), (2) Date Aug. 11, 2022,
PCT Pub. No. WO2021/164856, PCT Pub. Date Aug. 26, 2021.
Prior Publication US 2023/0063569 A1, Mar. 2, 2023
Int. Cl. B60T 13/26 (2006.01); B60D 1/24 (2006.01); B60D 1/64 (2006.01); B60T 13/66 (2006.01)
CPC B60T 13/263 (2013.01) [B60D 1/64 (2013.01); B60T 13/662 (2013.01); B60D 1/246 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A pneumatic system for a truck for a trailer connection, having a trailer air pressure supply line, a trailer service brake line, a first pair of couplers, and a second pair of couplers, with only one pair of couplers used at a time for coupling a trailer, the system comprising:
a first selector valve and a second selector valve, each having a rest state in which the trailer air pressure supply line and the trailer service brake line are respectively connected to the first pair of couplers, and having an energized state in which the trailer air pressure supply line and the trailer service brake line are respectively connected to the second pair of couplers,
a pneumatic control line for switching the first selector valve and the second selector valve from the rest state to the energized state, and
a solenoid valve which has a non-activated state in which the pneumatic control line is not pressurized and an activated state in which the pneumatic control line is pressurized and makes the first and the second selector valves switch from the rest state into the energized state,
wherein at least one pneumatic line test is performed while the solenoid valve is in the non-activated state and, depending on the output of the pneumatic line test, the solenoid valve can be switched into the activated state.