Application of automatic manual transmission technology in pure electric bus

Two-speed transmission system is usually employed by an electric vehicle to improve efficiency of an electric driving system and drivability of vehicle powered solely by electric power, i.e. pure electric vehicle, or series hybrid electric vehicle. The improvement of the drivability and efficiency due to the application of the multi-speed transmission system is shown based on motor drive system characteristics, traction characteristics and cost. Moreover, in addition to optimization of multi-speed automatic manual transmission (AMT) system and motor drive system, integrated control technology and multi-speed AMT system without clutch is also introduced. With the result of conducting field test and on-road test, it is obvious to see that the drivability and efficiency of vehicle provided with multi-speed AMT system is significantly improved.