Advanced design approach of power split device of plug-in hybrid electric vehicles using Dynamic Programming

In this paper, Dynamic Programming (DP) is applied for the first time to optimize the plug-in hybrid electric vehicle (PHEV) power split device (PSD) planetary gear ratio. Since there are many PHEV operation modes, modeling the PSD configuration is complex and designing the ideal PSD planetary gear ratio is quite challenging. The new design approach for the planetary gear ratio based on DP is discussed in this paper. The results of this study demonstrate that DP is an effective tool to design the PSD in order to minimize the vehicle running cost, and to maintain the vehicle performance.