| 摘要 |
A method for gearchange in a gearbox of a vehicle driving, said vehicle having 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 a sun gear (10), a ring gear (11) and a planet wheel carrier (12). The gearchange is carried out with the components of the planetary gear allowed to rotate with different rotational speeds and is finished by interlocking them. The combustion engine is controlled with respect to rotational speed during the gearchange towards the rotational speed required for the interlocking. |
| 主权项 |
1. A method for gearchange in a gearbox of a vehicle while driving, wherein
the vehicle has a propulsion system comprising a combustion engine with an output shaft, a gearbox with an input shaft, an electric machine comprising a stator and a rotor, and a planetary gear comprising three components in the form of a sun gear, a ring gear and a planet wheel carrier, the output shaft of the combustion engine being connected to a first of the components of the planetary gear so that rotation of the output shaft causes rotation of the first component, the input shaft of the gearbox being connected to a second of the components of the planetary gear so that rotation of the input shaft causes rotation of the second component, and the rotor of the electric machine being connected with a third of the components of the planetary gear so that rotation of the rotor causes rotation of the third component; the propulsion system further comprising locking means movable between a locking position in which two of the components are interlocked, so that the three components rotate with the same rotational speed, and a releasing position in which the components are allowed to rotate with different rotational speeds; the method comprising: placing the locking means in the releasing position, and then:a) controlling the combustion engine to bring the first component toward the rotational speed that the input shaft of the gearbox shall have so that an existing speed of the vehicle is synchronized with a shaft rotational speed for a gear to be engaged in the gearbox,b) controlling the electric machine towards a state in which the electric machine together with the combustion engine applies a zero torque to the input shaft of the gearbox,c) disengaging the gear engaged in the gearbox when the zero torque has been obtained,d) controlling the electric machine to apply a torque to the input shaft of the gearbox for bringing the input shaft to a rotational speed which, for the existing speed of the vehicle, is synchronized with a shaft rotational speed for the gear to be engaged in the gearbox,e) when bringing the speed of the input shaft toward synchronizing with the shaft rotational speed for the gear to be engaged, starting a gearengaging procedure while simultaneously controlling the electric machine towards obtaining a zero torque at the time for completion of the gearengaging procedure,f) controlling the electric machine to apply requested propulsion system torque on the input shaft of the gearbox,g) performing step a) in parallel with the steps b)-f),h) moving the locking means to a locking position when the rotational speed of the first component connected to the output shaft of the combustion engine has reached the rotational speed of the input shaft of the gearbox,i) controlling the electric machine and the combustion engine to apply the torque requested from each of them on the input shaft of the gearbox. |
