A METHOD FOR BRAKING A VEHICLE

摘要

A method for braking a vehicle driving forward, in which the vehicle has a propulsion system comprising a combustion engine with an output shaft (2a), a gearbox (3) with an input shaft (3a), an electric machine (9) comprising a stator and a rotor, and a planetary gear comprising three components in the form of a sun gear (10), a ring gear (1 1 ) and a planet wheel carrier (12). The vehicle is driven with one of said components connected to an output shaft of the combustion engine rotating with a lower rotational speed than one of the components connected to the electric machine. When the vehicle is braked the electric machine is controlled to apply a brake torque to the input shaft of the gearbox making the rotational speed of the combustion engine to increase.