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Nowadays the greatest part of the efforts to reduce pollutant emissions is directed toward the hybridification of automotive drive trains. Such topic has a particular relevance while looking at vehicles that operate in urban environment, like light commercial vehicles. In particular the design of an hybrid vehicle requires a complete system analysis including the optimization of the electric and electronic devices installed on the vehicle and the design of all the mechanical connection between the different power sources to reach required performances. The aim of this paper is to develop an energetic model to develop optimized strategies able to reduce pollutions emissions, design and control of a Plug-In Hybrid Electrical commercial Vehicle (PHEV) with particular attention paid to energy and power fluxes between the different devices. The model described in the paper has been experimentally validated on a Plug-in HECV, realized, in prototypal version, at the Mechanical Department of the Politecnico di Milano. The proposed validated model would be then exploited in order to develop an optimized energy management strategy with the aim to reduce pollutant emission of commercial vehicles that are used to deliver goods in urban areas.