On the basis of the shifting process of automated mechanical transmissions\r\n(AMTs) for traditional hybrid electric vehicles (HEVs), and by combining the features of\r\nelectric machines with fast response speed, the dynamic model of the hybrid electric AMT\r\nvehicle powertrain is built up, the dynamic characteristics of each phase of shifting process\r\nare analyzed, and a control strategy in which torque and speed of the engine and electric\r\nmachine are coordinatively controlled to achieve AMT shifting control for a plug-in hybrid\r\nelectric vehicle (PHEV) without clutch is proposed. In the shifting process, the engine and\r\nelectric machine are well controlled, and the shift jerk and power interruption and\r\nrestoration time are reduced. Simulation and real car test results show that the proposed\r\ncontrol strategy can more efficiently improve the shift quality for PHEVs equipped\r\nwith AMTs.
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