Patent ID: 8292779
Filing Date: 2012-10-23
Classification: B60K,B60W,Y02T,Y10T

Abstract:
1. A method of operating a drive train of a motor vehicle, the drive train comprising a hybrid drive including an internal combustion engine and an electric machine, a clutch being connected between the internal combustion engine of the hybrid drive and the electric machine of the hybrid drive, a transmission being connected between the electric machine of the hybrid drive and an output drive of the drive train, and a start-up element, disposed one of internally and externally of the transmission, being connected between the electric machine of the hybrid drive and the output drive, the method for starting-up the drive train when the clutch, connected between the internal combustion engine and the electric machine and the start-up element one of internally and externally to the transmission, are disengaged, and the electric machine being stopped and short circuited, the method comprising the steps of: accelerating the internal combustion engine to a rotational speed which depends on a short circuit torque of the electric machine to be overcome; engaging the clutch connected between the internal combustion engine and the electric machine; bringing the internal combustion engine to a rotational speed that depends on a request of a drive; and engaging the start-up element disposed one of internally and externally to the transmission.