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| Efficiency model test of electric vehicle driving motor system |
| 1.School of Energy ＆ Power Engineering, Shandong University, Jinan, Shandong 250061, China; 2.Jinan Electric Vehicle Operation Company Limited, Jinan, Shandong 250014, China; 3.Shandong Jiuli Electronic Technology Company Limited, Zaozhuang, Shandong 277800, China |
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Abstract To optimize vehicle control process according to optimal efficiency of motor system, the relationship of motor efficiency versus motor speed and torque was established. The experimental research was curried out under the work conditions measured from a real vehicle, and efficiency characteristics of the motor were obtained through a bench test. The results show that the motor system efficiency over 80% can be achieved within the range of 77.1% testing area. Electric motor efficiency data were fitted by Ordinary Least Squares (OLS). A quartic function was selected to describe the efficiency of the motor system based on the accuracy of fitting results and calculation complexity. The simulation was validated by the measured results which were obtained at full load characteristics of electric motor. The maximum relative error of 3.9% indicates that the function or model is reasonable. The proposed model can provide basis for optimizing vehicle control strategy based on the best efficiency of motor system.
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2012, Vol. 33 
