powertrain comprising an engine torque-controlled and speed

The system can use both electrical machines in either motor or generator mode. The composite engine assembly for a motor vehicle (10) comprises a first electrical machine whose output shaft (16) is connected to the planetary system (26) of an epicyclic gear train (12). The output shaft (14) of an IC engine is linked to the satellite carrier (24) of the gear train (12). A second electrical machine (18) and a bridge (20) are provided to transmit power to the wheels (22) of the vehicle and these are linked to the ring (28) of the epicycle gear train. The two electrical machines are designed to operate equally as motor or generator. An electronic control module determines the operational mode of the system, when for example the IC engine is running, the first machine (16) operates as a motor, and the second machine (18) operates as a generator.