Method for driving away of a vehicle

A method for moving off a hybrid vehicle with a propulsion system (1) comprising a planetary gear with three components: a sun gear (10), a ring gear (11) and a planet wheel carrier (12). The output shaft (2a) of a combustion engine (2) is connected to a first of said components, an input shaft (3a) of a gearbox (3) is connected to a second of said components and the rotor (9b) of an electric machine (9) is connected to a third of said components. The propulsion system further comprises locking means transferable between a locking position and a releasing position respectively, in which the components rotate as a unit and with different rotation speeds respectively. The method starts from an initial state with the combustion engine idle, the locking means in the releasing position and an appropriate gear for moving off engaged in the gearbox. The electric machine is controlled to apply a positive torque on the third component of the planetary gear, and the rotation speed of the combustion engine is controlled towards a constant rotation speed. A reaction torque is created and gives rise to a demanded driving torque, whereby the vehicle moves off.