Drive line operation method

A method of operating a vehicle drive train, whereby the drive train comprises a drive unit, a transmission, and an all-wheel splitter having an automatically operating clutch, positioned between the transmission and the output. The clutch is operated in a continuous slip mode and in such a way that the all-wheel splitter splits the transmission output torque for variable torque distribution to driven axles. The splitting of the output torque to the driven axles is performed by a control unit, implemented into the all-wheel drive strategy, so that the output torque, less a predetermined nominal torque, is transferred to a first axle, and the nominal torque is transferred to a second axle. When defined operating conditions are met, a limiting of the torque, set by the drive unit, and/or the nominal torque, set by the all-wheel strategy, occurs to avoid a thermal overloading of the clutch of the all-wheel splitter.