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© 2019, Editorial Department of Journal of Chang'an University (Natural Science Edition). All right reserved. To solve the problem of power interruption during gear shifting of AMT in traditional hybrid electric vehicle (HEV) with automatic transmission, a HEV system that consists of one engine, two motors, and transmission with four gear ratios was proposed. By controlling the engine, motors, clutches, and synchronizers of hybrid driving system, it could work in electrical driving mode, parallel hybrid driving mode, series hybrid driving mode, regenerative braking mode, and driving charging mode. The system was equivalent to a mass-spring-damping system adopting the lump inertia method and Newton's second law, from which the dynamic equations were built. The engine model and electric motor model were built through the lookup table method. The mode-switching control strategy and gear-shifting control strategy were designed according to the driving system structure characteristics. The output torque of the engine and motors were coordinately controlled during mode switching and gear shifting based on the torque response characteristics. The electric motor torque compensation control strategy based on engine output torque was designed to maintain the vehicle driving torque and eliminate torque interruption. The vehicle model and control model were built with the AMESim and MATLAB/Simulink software, which were used to simulate the vehicle launching process and gear shifting process. The results show that the HEV system ensures the smooth change of output torque without power interruption during gear shifting. Vehicle jerks during mode switching and gear shifting are limited, by controlling the change rate of engine and motor output torque, as well as engaging and disengaging the speed of clutches and synchronizers. 4 tabs, 17 figs, 22 refs. |
