METHOD FOR DRIVING A HYBRID VEHICLE IN CONNECTION WITH START OF THE COMBUSTION ENGINE OF THE VEHICLE

摘要

A method for driving a hybrid vehicle with a propulsion system including a combustion engine, an electric machine with a rotor and a stator and a planetary gear with three components including a sun gear, a ring gear and a planet wheel carrier, where an output shaft of the combustion engine is connected to a first component, an input shaft of a gearbox is connected to a second component and the rotor of the electric machine is connected to a third component. The vehicle is driven forward by the electric machine. The reverse gear engaged in the gearbox drives the third component of the planetary gear to rotate with a negative rotational speed while a brake brakes the first component. Thereafter, move the component brake to an open position, so that the output shaft of the combustion engine rotates with a positive rotational speed so that the combustion engine may be started.

主权项

1. A method for driving a vehicle and starting a combustion engine in a propulsion system of the vehicle, wherein the propulsion system comprises:
a combustion engine including an output shaft, an electric machine including a stator and a rotor, a gearbox including an input shaft, a planetary gear comprising three components including a sun gear, a ring gear and a planet wheel carrier, the output shaft of the combustion engine connected to a first of the three components of the planetary gear such that rotation of the output shaft of the combustion engine causes rotation of the first component, the input shaft of the gearbox connected to a second of the three components of the planetary gear such that rotation of the input shaft of the gearbox causes rotation of the second component and the rotor of the electric machine is connected to a third one of the three components of the planetary gear, such that rotation of the rotor causes rotation of the third component, locking means movable between a locking position in which two of the three components of the planetary gear are interlocked for causing the three components to rotate as a unit with a same rotational speed and a releasing position in which the three components are allowed to rotate with different respective rotational speeds, and a component brake being so located and being movable between a braking position in which the rotation of the first component of the planetary gear is braked by the component brake, and an open position in which rotation of the first component of the planetary gear is not affected by the component brake; the method comprising steps of: a) driving the vehicle forward using the electric machine by engaging a reverse gear in the gearbox while the electric machine drives the third component of the planetary gear to rotate with a negative rotational speed, with the locking means in the releasing position and with the component brake in the braking position, and b) moving the component brake to the open position, such that the output shaft of the combustion engine, via said the first component of the planetary gear, is rotated with a positive rotational speed, such that the combustion engine is in condition to be started.