COMPUTER SYSTEM FOR ASSISTING IN COUPLING AND UNCOUPLING A SEMI-TRAILER TO A TRACTOR VEHICLE, METHOD AND VEHICLE COMPRISING SUCH A COMPUTER SYSTEM

A computer system (50), for assisting in coupling and uncoupling a semi-trailer (22) to a tractor vehicle (21), comprising processing circuitry (51) configured to use information provided by at least one sensor (40) to automatically check whether a plurality of elements (31, 32, 33, 34, 35) of the semi-trailer (22) and the tractor vehicle (21) are in a first safe position, in a second safe position or in a third position. The computer system (50) unlocks (S105, S205) a tractor vehicle parking brake (36) if all the elements (31, 32, 33, 34, 35) are in the first safe position or if all the elements are in the second safe position and locks (S109, S209) the tractor vehicle parking brake (36) if at least one of the elements (31, 32, 33, 34, 35) is in a different position than the others or in the third position.