Propulsion device for an all-wheel-drive vehicle and method for distributing the drive torque to a front axle drive and a rear axle drive

A method for operating a propulsion device for an all-wheel-drive vehicle having a front axle drive with an internal combustion engine and a first electric machine and a rear axle drive with at least one second electric machine, with the rear axle drive being mechanically decoupled from the front axle drive, comprising the steps of:

• determining with an electronic control device an overall drive torque for driving the vehicle in response to a request from a driver;
• variably distributing with a torque distribution unit operatively connected with the electronic control device the overall drive torque to the front axle drive and the rear axle drive commensurate with input parameters generated in a driver assistance system,
• at low vehicle speeds in city driving in a range of 50 km/h, controlling with the torque distribution unit so as to supply the overall drive torque only to the rear axle drive, and
• in presence of lateral dynamic effects, controlling the propulsion device with the electronic control device in an all-wheel-drive mode,
• wherein the overall drive torque is always distributed within driving dynamics limits.