Method for operating hybrid drive system for use in motor vehicle, involves monitoring magnitude of current flowing to machine and detecting misfire of engine based on deviation of monitored magnitude of current from threshold value

摘要

The method involves providing an electric machine (5) that is temporarily connected to an internal combustion engine (2). A misfire detection unit (13) is provided to detect misfire of the internal combustion engine. The magnitude of current flowing to the electric machine is monitored and the misfire of the engine is detected based on the deviation of the monitored magnitude of current from predetermined threshold value. An independent claim is included for hybrid drive system.