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Optimum control strategy of regenerative braking energy for electric vehicle |
School of Automobile, Chang′an University, Xi′an, Shaanxi 710064, China |
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Abstract To improve the regenerative braking energy for electric vehicles, the optimal control strategy of regenerative braking energy was proposed based on braking rate control. According to the ideal regenerative braking control strategy, theoretical analysis and simulation analysis methods were used to investigated the relationship between regenerative braking energy and braking rate. The optimal braking rate was analyzed to maximize regeneration energy under various initial braking velocity by the vehicle longitudinal dynamics theory and the cosimulation model built in MATLAB/Simulink and CarSim. The variation law of optimal braking rate was fitted by the least square method to gain polynomial fitting equation. The optimum control strategy of regenerative braking energy was designed with two parts of braking force distribution and optimal braking rate control, and it was compared with the ideal regenerative braking control strategy. The results show that the braking rate has great influence on regenerative braking energy, and the optimized regeneration energy can be realized under single braking condition by the optimum control strategy.
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Received: 18 April 2017
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