METHOD FOR OPERATING A DRIVE TRAIN

The method involves performing traction upshifts under cooperation of a shifted frictionally-engaged shifting element and a removed frictionally-engaged shifting element of an automatic shift gearbox (3). Torque, provided by a combustion engine (1), is reduced for performing the traction upshifts during starting of a connection process in the shifted frictionally-engaged shifting element. The torque is increased to begin partial shifting of the torque from the engine to an electric machine during starting of the connection process.