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This article looks into the mechanism of the driving torque ripple before and after shift, and the analyses are based on profound study of the structure and shift process of two-speed automated mechanical transmissions for pure electric vehicles. With the basic driving control strategy for pure electric vehicles, a torque compensation strategy in the shift process is proposed to suppress the ripple. Besides, theoretical analyses and simulations are conducted. The results show that by means of the proposed torque compensation strategy, the ripple is significantly abated and the shift cycle is eliminated

A torque compensation strategy in two-speed automated mechanical transmission shift process for pure electric vehicles