Method for operating a drive train and control device

A method for operating a drive train of a hybrid vehicle with a hybrid drive comprising at least an electric machine and an internal combustion engine, wherein an automated manual transmission is connected between the internal combustion engine- and an output, wherein the electric machine is coupled via a friction clutch to a shaft of the automated manual transmission, the method comprising:

• detecting upcoming shift by an automated manual transmission control device;
• reducing a drive torque provided by the electric machine on the output in a first phase according to an adjustment of a drive torque provided by the internal combustion engine on the output;
• opening the friction clutch during the first phase;
• executing an actual gear shift;
• and
• building up a drive torque at the output in a second phase,
• wherein for executing the actual gear shift after a gear disengagement of an actual gear of the shift and before a gear engagement of a target gear of the shift, the automated manual transmission is synchronized using a flywheel mass of the electric machine such that, when the friction clutch is opened, the rotational speed of the electric machine is brought to an inertial rotational speed and that subsequently the drive torque provided by the internal combustion engine is reduced again.

A method for operating a drive train of a hybrid vehicle with a hybrid drive comprising at least an electric machine and an internal combustion engine, wherein an automated manual transmission is connected between the internal combustion engine- and an output, wherein the electric machine is coupled via a friction clutch to a shaft of the automated manual transmission, the method comprising:

• detecting upcoming shift by an automated manual transmission control device;
• reducing a drive torque provided by the electric machine on the output in a first phase according to an adjustment of a drive torque provided by the internal combustion engine on the output;
• opening the friction clutch during the first phase;
• executing an actual gear shift;
• and
• building up a drive torque at the output in a second phase,
• wherein for executing the actual gear shift after a gear disengagement of an actual gear of the shift and before a gear engagement of a target gear of the shift, the automated manual transmission is synchronized using a flywheel mass of the electric machine such that, when the friction clutch is opened, the rotational speed of the electric machine is brought to an inertial rotational speed and that subsequently the friction clutch is first closed to the inertial synchronization of the automated manual transmission and subsequently at least partially opened again.