Abstract: A method for operating a hybrid drive train of a motor vehicle, comprises the following steps: closing the separating clutch in order to mechanically couple the internal combustion engine to at least one wheel and to propel the motor vehicle, whereby the drive power is supplied at least partially by the internal combustion engine; determining the TARGET drive power (P) of the drive train of the motor vehicle; determining the ACTUAL speed (V) of the motor vehicle; determining the switchover power (U) to separate the separating clutch and to operate the drive train in the serial mode of operation (SB) as a function of the determined ACTUAL speed (V); and issuing a warning message when the difference between the switchover power (U) and the TARGET drive power (P) falls below a prescribed drive power tolerance value (T). Furthermore, the invention relates to a motor vehicle.

Abstract: The present invention relates to a method for compensating for no-load losses in an electric vehicle comprising a first drive unit in the form of an electric machine which is supplied with power by at least one battery of the electric vehicle for driving the electric vehicle, and a second drive unit for driving the electric vehicle. In a no-load operation of the first drive unit, in which the first drive unit is to provide neither a positive nor a negative moment, the no-load losses at the first drive unit are compensated for to a different degree, depending on route data and/or vehicle data of the electric vehicle. The invention further relates to a computer program product for carrying out the method according to the invention, to a data carrier on which the computer program product is stored, and to an electric vehicle.

Abstract: A method for operating a hybrid drive train of a motor vehicle, comprises the following steps: closing the separating clutch in order to mechanically couple the internal combustion engine to at least one wheel and to propel the motor vehicle, whereby the drive power is supplied at least partially by the internal combustion engine; determining the TARGET drive power (P) of the drive train of the motor vehicle; determining the ACTUAL speed (V) of the motor vehicle; determining the switchover power (U) to separate the separating clutch and to operate the drive train in the serial mode of operation (SB) as a function of the determined ACTUAL speed (V); and issuing a warning message when the difference between the switchover power (U) and the TARGET drive power (P) falls below a prescribed drive power tolerance value (T). Furthermore, the invention relates to a motor vehicle.