Design, Control and Validation of Two-Speed Clutch-less Automatic Transmission for Electric Vehicle

Two-speed or multiple-speed automatic transmissions can obviously improve the overall manipulating performance in terms of shifting quality and energy efficiency when equipped electric vehicles (EVs). This study details design a two-speed clutch-less transmission (2AT) for EVs motor controlled mechanism. Firstly, novel clutch is devised with motor-controlled mechanism, which enables shift motions speed control driving synchronization during shifts. Secondly, coordinated strategy controlling detailed different processes to achieve fast smooth shifting. The torque trajectory optimization synchronizing process attained by applying Pontryagin's minimum principle. simulation experimental results verify mechanism algorithm response smoothness designed 2AT.