METHOD FOR CONTROLLING A MECHANIC COUPLING DEVICE BETWEEN VEHICLE AXLES, CONTROL METHOD FOR A RESPECTIVE TRANSMISSION SYSTEM, RESPECTIVE TRANSMISSION SYSTEMS, PROGRAM REALISING THE METHOD STEPS, STORING DEVICE WITH SUCH A PROGRAM AND AUTOMOBILE WITH A CORRESPONDING SYSTEM

摘要

The invention relates to a method for controlling the operation of a means (11) for mechanically coupling first (17) and second (19) axles of a transmission system (18) of a motor vehicle (10), the first axle being driven by default and the second axle being optionally driven according to the status of the coupling means, the transmission system being capable of operating in a first mode (4x4 Off Road) in which the torque that can be transmitted by the mechanical coupling means is fixed, or in a second mode (4x4 Automatic) in which the torque that can be transmitted by the mechanical coupling means is variable, a braking action caused by a parking-brake device (13a) causing the coupling means to be deactivated if the speed of the vehicle is higher than a first threshold speed (S2) and while the speed of the vehicle is higher than a second threshold speed (S1), in the first and second modes.