Hybrid drivetrain having active torsional vibration damping, and method for carrying out the active torsional damping

A drivetrain having a combustion engine subject to torsional vibrations, having a crankshaft, comprising:

• a torsional vibration damper that is operationally connected to the crankshaft;
• at least one operating point of lesser vibration isolation of the torsional vibrations;
• a primary inertial mass assigned to the crankshaft;
• a secondary inertial mass opposite the primary inertial mass, which is relatively and rotatable contrary to the effect of a spring device, assigned to a transmission input shaft of a transmission;
• an electric machine with a rotating mass that is operationally connected to the transmission input shaft;
• and,
• a control unit, wherein the spring device is formed of linearly formed springs distributed around the circumference, the rotating mass of the electric machine is designed as the secondary inertial mass, and the electric machine can be regulated by means of the control unit to a compensation torque Tharm that compensates for a disturbance torque Tdyn subject to torsional vibration which occurs at at least one operating point.