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The last years have seen an increasing need to reduce vehicle polluting emissions which has lead car producers to improve their efforts to comply with the new legislation. At the moment, hybrid electric vehicles (HEV) seems to be the most suitable solution as they match good performances in terms of both consumption and reliability. In a such dynamic market, an interest for small and light city-car is rising, especially in Europe, where urban circulation is getting worst due to huge number of vehicles. Such special characteristics, like smallness and lightness, allow these hybrid vehicles to run 40 km with a litre of fuel only. In this scenario, the Hybrid and Electric Research Group of ENEA planned the realization of an hybrid power train suitable for small city car.