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Control strategy of powersplit HEV based on optimal transmission efficiency
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School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract To investigate a powersplit hybrid electric vehicle (HEV), the lever method was used to analyze the dynamic behavior of the power coupling mechanism, and the ratio of the motor speed, torque and power to the engine was obtained. The ratio of transmission efficiency to electric power of the vehicle was calculated, and the power split and circulation phenomena were analyzed. To avoid power circulation phenomenon and ensure high transmission efficiency of the vehicle, the mechanical point(MP) control strategy was formulated, and the optimal switching threshold K value was optimized. The dualplanetary HEV model was built on the AVL/Cruise platform, and the whole vehicle energy management strategy was built in MATLAB/Simulink. The control strategies were simulated and verified under NEDC cycle condition. The results show that compared with the OOL control strategy, the MP control strategy can guarantee the higher efficiency of transmission system with state of charge(SOC) kept in good scope, and the equivalent fuel consumption per hundred kilometers of HEV is decreased by 8.5% with effectively improved fuel economy.
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