Operating motor vehicle drive unit with internal combustion engine, electrical machine involves changing engine from normal to drag mode depending on at least one vehicle operating condition and at least one vehicle surroundings condition

摘要

The internal combustion engine (2) has a variable valve drive and interacts with the electrical machine (4) so that the engine can be driven via the electrical machine. The engine can be changed from normal mode to drag mode depending on at least one vehicle operating condition and at least one vehicle surroundings condition, whereby in drag mode the engine is switched off, the electrical machine is activated so the engine is dragged by the electrical machine and the valve drive is controlled so that the drag moment on the engine is reduced.