关键词：电动汽车；双速；性能评价
摘 要：For a novel electric vehicle equipped with 2-speed Inverse Automated Manual Transmission (I-AMT),optimal design of the gear ratios is carried out using dynamic programming (DP) under vehicle dynamic constraints.Given multiple driving cycles,the design target is to make the electric vehicle obtain the best energy consumption economy.After the gear ratios are determined,the performance of the 2-speed electric vehicle is compared with the same vehicle with a single-speed gear box,and it is shown that the 2-speed transmission has much better performacne in terms of acceleration time,maximum speed and energy economy.