In recent years the regulations are limiting the emissions released by internal combustion engines, requiring car manufacturers to modify their propulsion system, restricting engine displacement and also to adopt hybrid configurations by coupling an electric motor to the thermal one, in order to optimize their functionalities. In this regard, different configurations for the union of the two motors have been developed, ensuring advantages on one side but occasionally limiting certain aspects, in fact a perfect solution doesn’t exist. Even under the aspect of costs there are problems, in fact the choice of a hybrid architecture brings significant changes in layout, of course depending on the architecture chosen, but which may therefore require large investments on the part of the manufacturer.