The automotive sector is constantly trying to develop new strategies to decrease the consumptions and to improve the performances. The market and the world need are converging with a paradigm shift to the renewable sources. At the present time the two options of the Electric Vehicle (EV) and the Hybrid Electric Vehicle (HEV) are two of the best perspective in which we can put our efforts. The first one, the EVs, is still limited by technical and engineering issues due to the knowledge of this time, in particular about the Energy density of the batteries. From this issues started to develop the possibility to associate an Ice Combustion Engine (ICE) to the Motor-Generator Unit (EM) with the HEVs technology.