中文摘要：

为系统地分析挡位数对电动公交车能耗的影响及车辆变速箱匹配问题,建立了电动公交车动力驱动系统模型.文中使用动态规划方法对车辆变速箱分别采用4,3,2挡设计,对车辆变速箱在4种工况下进行换挡控制优化,并提取最优双参数换挡策略,得到最优能耗数据.结果表明：以4挡变速箱为参考标准,使用3挡变速箱仅增加约1%的能耗,而2挡变速箱则增加大约5%的能耗.

英文摘要：

In order to analyze the effect of gear number on the energy consumption of electric bus and the gearbox configurations,a power-train model of an electric bus was build,the AMT gear number was configured to be 4,3 and 2 respectively. Dynamic programming was applied to find out the optimal gear shifting trajectory for the 3 gearbox configurations under 4 different driving cycles,then the two-parameter gear shifting strategies were extracted from the optimal results,and the minimum energy consumptions for the 3 gearbox configurations were achieved from simulation. The result shows that： compared to 4 speed gearbox,using 3 speed gearbox bring 1% extra energy consumption,while 2 speed gearbox bring about5% extra energy consumption.