A unified approach for capacity and power based sizing of electric machine and battery in P2 hybrid electric vehicles

Hybrid electric vehicles have proven to be an effective solution for the auto industry to satisfy the increasingly stringent CO2 regulations for the short-medium term. Proper sizing of the different components is required to benefit from the hybrid architecture full potential. This paper proposes a unified method that can be applied in both cases. The method uses the energy flow, storage, and consumption during a cycle to perform the sizing. A 350 V P2 plug-in hybrid and a 48 V P2 mild hybrid are taken as a case study. The sizing is performed by adopting the WLTP cycle and subsequently analyzing the energy profile.