Method and apparatus for adapting a loss torque of an internal combustion engine in a hybrid drive system

The invention relates to a method for adapting a loss torque of an internal combustion engine (2) in a hybrid drive system, wherein the adaptation of the loss torque is performed using an adaptation size, comprising the steps of: - setting an operating point of the internal combustion engine (2) with a predetermined motor torque (M) and a predetermined target rotational speed (n - rules of the target rotational speed (n - determining a permanent control error of the speed control (11); and - determining the adaptation value of the adaptation variable depending on the constant deviation of the speed control (11).