A modified method for the sizing of the plug-in hybrid electric vehicle propulsion devices

To extend the all-electric range (AER) of plug-in hybrid electric vehicles (PHEV) improved operating efficiency of the internal combustion engine (ICE) is a concern. In this paper, the problem of low efficiency ICE operation is resolved through means of considering control during the sizing design stage. The ICE limited operation leads to the need for the traction motor (TM) to satisfy any remaining demand from standardized drive cycles. It is foreseen that this method is novel in the sense of its application and has been modified to suit the operating requirements of a PHEV connected in the power-split mode of operation. The power ratings of the ICE and TM are then simulated using ADVISOR to support the performance outcome of the calculations completed. Finally, a comparison is made against existing PHEV and HEV transactions for which greater efficiency in operation is demonstrated, leading to reduced fossil-fuel consumption and improved AER.