Nowadays the reduction of greenhouse gases (GHG) in the transport sector plays a crucial role in the European Union regulations. Plug-in Hybrid Electric Vehicles (PHEVs) represent a valid solution to immediately decrease vehicle tailpipe CO2 emissions combining the advantages of conventional vehicles and battery electric ones. However the complexity of PHEVs is higher because of the presence of more on-board sources of power, so an appropriate Energy Management System (EMS) is needed. The standard control consists in implementing first the charge depleting (CD) strategy which uses electric energy from the battery to achieve pure electric driving and later the charge sustaining (CS) strategy which is mainly internal combustion engine (ICE) assisted.