Abstract: A method for checking a functional capability of an internal combustion engine operated by a multi-fuel system, in which method at least two control devices electronically control a combustion process of the internal combustion engine with a different fuel, each control device having a dedicated safety concept, and a system functionality of the multi-fuel system being divided among the at least two control devices. To describe an overall safety concept, one control unit, which may be one of the at least two control devices, monitors the overall system functionality of the multi-fuel system.

Abstract: A method for operating a hybrid drive, developed as a parallel hybrid, and having a drive train, especially for a motor vehicle, having at least one internal combustion engine and at least one electrical machine device or a hydraulic machine device, a separating clutch being situated between the internal combustion engine and the electrical or hydraulic machine device and, as seen in the drive direction, the electrical or the hydraulic machine device is postconnected to the internal combustion engine, the separating clutch being separated in the overrun condition if a specifiable drag torque is able to be absorbed by the electrical or the hydraulic machine device.