Method for operating drive train of hybrid drive of motor car, involves partially balancing tensile interruption of combustion engine using mechanical rotor moment of electric machine during switching such that friction clutch is operated

The method involves degrading a tensile force provided by an internal combustion engine (3) in a first phase. A switching is executed in a second phase. The tensile force is again constructed in a third phase. A tensile interruption of the combustion engine is partially balanced using a mechanical rotor moment of an electric machine (7) of a drive unit during switching such that a friction clutch (9) between the electric machine and an output shaft (1) is operated, where the combustion engine is connected to the output shaft over an automated gearbox.