Procedure for running a vehicle

A method for driving a hybrid vehicle in connection with start of a combustion engine (2) in a propulsion system (1) of the vehicle, which propulsion system comprises a planetary gear with three components in the form of 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) being 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 method starts when the vehicle is being driven forward by the electric machine, which with a reverse gear engaged in the gearbox drives the third component of the planetary gear to rotate with a negative rotational speed while a component brake (28) brakes said first component. The method comprises the step to transfer the component brake to an open position, so that the output shaft of the combustion engine planetary gear is brought to rotate with a positive rotational speed, whereby the combustion engine may be started.