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| Optimal control strategy of efficiency for dual motor coupling drive system of pure electric vehicle |
| School of Traffic and Transportation, Northeast Forestry University, Harbin，Heilongjiang 150040, China |
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Abstract For a pure electric veicle, a dual motor coupling drive system was designed with motor parameter matched, and the optimal control strategy of motor coupling drive efficiency was proposed. The working mode of the drive system was analyzed, and the optimal working point of motor and the efficiency of drive system were calculated by the sequential quadratic programming algorithm. Based on the principle of optimal drive system efficiency, by comparing the drive system efficiencies under four working modes at each working point, the control strategy of dual motor coupling drive system under multi-mode switching was proposed with emphasis on the pattern recognition control strategy. A co-simulation model was established to verify the proposed efficiency optimal control strategy. The results show that the proposed optimal efficiency control strategy of the dual motor coupling drive system has good control effect. In the whole new European driving cycle（NEDC）, the average efficiency of the dual motor coupling drive system is 85.9%, and the motor operating point with the driving system efficiency greater than 85.0% accounts for 55.0% of the whole operating range. The motor can work in high efficiency range with more high load rate of motor, and the dynamic performance and economic performance of the vehicle can be improved.
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Received: 07 August 2020
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2022, Vol. 43 
