There is a supervision unit (5) having a unit for receiving and analysing a relative signal from the route and the location of the vehicle. This signal is emitted by a navigation and guidance system (6), with a computer estimating the future power demand o...

The method involves producing power for auxiliary loads (4-7) depending on the power to be drawn at the wheels at any given time and only driving the auxiliary loads from an electrical drive machine (8) if the vehicle is stationary or if the sum of the the...