Determining a decelerating torque of a coupled with a free wheel to an internal combustion engine regeneratively operable electric machine

The invention relates to a method for determining a deceleration torque (M) of a with a freewheel (111) of an internal combustion engine (112) coupled to the electrical machine (114), which (the steps of detecting a time course of a rotational speed (n The invention further relates to a corresponding arithmetic unit (118) which is adapted for performing the method, and a corresponding computer program.