Abstract
In order to realize a quick, smooth and precise shifting process of hybrid electric vehicle (HEV) equipped automated manual transmission (AMT), a research platform for HEV driven by electrically controlled engine and drive motor was established. The key technologies including its system components, working principle, control strategy of engine and motor during shifting process were analyzed. A technology of AMT shift without disengaging the clutch was proposed. According to the dynamic characteristics of the HEV’s engine, motor, and transmission, the dynamic model of transmission system was established. The various stages of shifting process were emphatically analyzed. Its shift characteristics and the key factors affecting the shift quality were grasped. On the basis of the above researches, the shift control strategy without disengaging the clutch was acquired. It was verified on a demo HEV platform. The results showed that the technology of AMT shift without disengaging the clutch for HEV not only ensured smooth shifting through the coordinated control of engine, motor and actuator, but also shortened the shift time and improved the shift quality significantly.
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