Optimal gear ratios selection for a nissan leaf: A case study of InGear transmission system

In this paper, the impact of transmission gear ratios selection on a Nissan Leaf EV (NLEV) is investigated. The traditional single ratio gearboxes are replaced by multiple ratio ones. The selection of the gear ratio is proved to have a significant impact on electric vehicle's performance and range. A mathematical model of a NLEV is developed for both single and multiple ratio transmission systems. The influence of different gear ratios is studied on Nissan Leaf performance. The simulation results reveal a significant effect on the overall efficiency due to integrating a transmission system with a NLEV. Comparisons are performed for both single and two-speed transmissions and results are quantified and discussed.