Energy control strategies comparison for a city car Plug-In HEV

In the last few year many control strategies regarding the energy management in hybrid electrical vehicle (HEV) have been discussed. This paper aims to compare different strategies with a particular attention to plug-in-HEVs (P-HEV) energy management algorithms. In facts many control strategies have been developed and discussed on traditional parallel HEV in order to find out the most efficient energy management of the electrical motor (EM) and the internal combustion engine (ICE). The adoption of these control strategies on a P-HEV, with an oversized on board energy storage system (vs. traditional HEV), do not lead to a significant improvement of the global vehicle efficiency because they use the electrical motor (EM) only for short operation time and they consider all the energy stored into the battery produced by the ICE. Control strategies developed for traditional parallel HEV have been taken into account and they have been opportunely adapted in order to utilize the extra amount of energy stored into the batteries. A full energetic simulation model has been used in order to compare the performances of different control strategies. The P-HEV model has been specialized for the vehicle realized at Mechanical Dept. of Politecnico di Milano and it has been validated using experimental data.