Research on the shift rule of two-speed transmission in pure electric van
by Haiyang Long; Zhitao Wang; Jiajun Wang; Yongpo Li; Xuewen Hui; Senqi Tan
International Journal of Vehicle Systems Modelling and Testing (IJVSMT), Vol. 16, No. 2, 2022

Abstract: To balance the dynamic and economic performance of pure electric vehicles, an optimal shift schedule is proposed in this paper for a pure electric van equipped with a two-speed gearbox. The driving motor parameters are calculated based on the vehicle dynamic requirements, and the driving motor characteristic curve is utilised to establish the optimal shift schedule. Analysis of the dynamics of the whole vehicle and the maximum acceleration method are adopted and the relationship between acceleration and speed under different throttle opening degrees is obtained, thus the optimal dynamic shift point is determined. To generate motor efficiency MAP offline, the law of economic shift is obtained using table lookup, thus the optimum economic shift point is determined. The comprehensive dynamic and economic shift schedule is obtained, which considers both dynamic and economic factors. Dynamic and economic simulation verification is performed in MATLAB Simulink, the results show that the integrated shift schedule can meet the dynamic and economic requirements of electric vehicles, and provide a theoretical reference for the formulation of the shift schedule of electric vehicles.

Online publication date: Tue, 10-Jan-2023

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