Patent ID: 8123657

Claim:
A method of operating a drive train of a motor vehicle whereby the drive train comprises a hybrid drive with a combustion engine and an electric motor, a transmission, positioned between the hybrid drive and the output, and a clutch, positioned between the combustion engine and the electric motor, whereby, when the electric motor exclusively drives the motor vehicle, the combustion engine can be started by engaging the clutch, positioned between the combustion engine and the electric motor, further comprising that when the electric motor permanently or without traction force interruption is coupled to the output and a rotational speed of the electric motor is greater than a starting rotational speed of the combustion engine, and the method comprising the steps of: engaging the clutch, positioned between the combustion engine and the electric motor, in such a way that the clutch is brought to a slippage, via a partial engagement, to start the combustion engine, and thereafter completely disengaging the clutch, meaning before reaching a synchronous rotational speed between the combustion engine and the electric motor.