Conventional plug-in hybrid electric vehicle (PHEV) is a combination of two propulsion systems, one is an IC engine propulsion system and the other is an electric propulsion system in which electric motor powered by a battery element is used for propulsion.  The purpose of electric propulsion system is intended to achieve either better fuel economy than a conventional IC engine or better performance.  To re-charge the battery element, manual operation has to be carried out by plugging the battery element…