Optimal design and simulation evaluation of economical gear-shifting schedule for AMT in pure electronic bus

50 “zero emission” pure electrical buses BK6122EV have been running in Beijing for the whole year. As one of the core systems of the bus, the automatic mechanical transmission (AMT) has the enormous influence on its economical performance. In order to further optimize the economic gear-shifting schedule for BK6122EV, this paper uses three design methods of the conventional engine vehicle for reference, where the fuel consumption figure of the engine is substituted for the efficiency map of the driving motor. The simulation model of BK6122EV based on AVL Cruise simulation software is built to compare and optimize the designed schedules. Moreover, the best schedule is gained. The result of the simulation indicates the economical performance of the bus using the optimized schedule is improved by 1.54 percent compared with the existing schedule.