METHOD OF OPERATING A TRANSMISSION SYSTEM OF AN AUTOMOTIVE VEHICLE OF THE FOUR-WHEEL DRIVE TYPE COMPRISING A MEANS OF MECHANICALLY COUPLING THE FIRST AND SECOND AXLES

摘要

Method of operating a transmission system (18) of an automotive vehicle (10), the transmission system comprising a means (11) of mechanically coupling the first (17) and second (19) axles of the transmission system, the status of the coupling means defining a number of transmission modes, characterized in that if the automotive vehicle crosses a speed threshold for a determined length of time of, for example, between 30 seconds and two minutes, the transmission system switches from a first mode (4×4 all-terrain) in which the torque that can be transmitted by the means of mechanical coupling is fixed, into a different transmission mode.