Method for the operation of a hybrid drive train in a motor vehicle

Abstract

Disclosed is a method for operating a hybrid drive train (1) comprising an internal combustion engine (2) and an electric machine (3) as drive units as well as a parallel transmission that is provided with a first input shaft (4a), a second input shaft (4b), and an output shaft (9). The first input shaft can be coupled to the output shaft via at least one first gear while the second input shaft can be coupled to the output shaft via at least two second gears. The internal combustion engine can be effectively connected to the first input shaft via a first clutch and can be effectively connected to the second input shaft via a second clutch. The electric machine is drivingly connected to the second input shaft. Said method encompasses the following steps: a first gear is engaged; torque is applied to the first input shaft by means of the internal combustion engine via the first clutch; a second gear is engaged; torque is applied to the output shaft by means of the electric machine; the torque transmitted via the first clutch is reduced by creating clutch slip while the torque of the electric machine is increased; the torque of the electric machine is reduced to zero, and a second second gear is engaged while the torque transmitted via the first clutch is increased by reducing slip on the first clutch; torque is transmitted to the output shaft by means of the electric machine.

Description

technical field [0001] The invention relates to a method for operating a hybrid powertrain for a motor vehicle, wherein the hybrid powertrain has an internal combustion engine and an electric machine as drives, wherein in the hybrid powertrain a There is a parallel shift transmission having a first transmission input shaft, a second transmission input shaft and a transmission output shaft, wherein the first transmission input shaft can communicate with the The transmission output shaft is coupled and the second transmission input shaft is coupled to the transmission output shaft via at least one second gear, wherein the internal combustion engine is operatively connectable to the first transmission input shaft via a first clutch and via A second clutch is operatively connected to the second transmission input shaft, wherein the electric machine is drivingly connected to the second transmission input shaft. Background technique [0002] This method is known from pages 252 to...

AI Technical Summary

Problems solved by technology

[0008] This method has the disadvantage that when changing gears on the input shaft of the second transmission, i.e. Torque can be transmitted by the electric machine to the drive wheels, since the subtransmission formed by the second gear is then briefly in the neutral position

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