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为了在工况变换控制过程中,实现基于电动机系统最佳效率的优化控制,构建了电动机系统效率与转速及转矩之间的关系式.由实车测得的数据,确定了研究工况的范围,在电动机加载试验台上对电动机系统效率特性进行了测试,结果显示被测驱动电动机系统效率η>80%的区域面积占整个测试区域范围的77.1%.基于最小二乘法,对电动机系统效率进行曲面拟合,综合考虑拟合结果的精度及运算工作量,确定采用4次函数构建电动机系统效率模型;利用驱动电动机外特性部分工况点测试结果对模型进行了验证.结果表明:模型计算值与实测值的最大相对误差为3.9%,建立的模型是有效的,该模型能够为在整车控制器中制定基于电动机系统最佳效率的优化控制策略提供依据.
In order to realize optimal control based on the optimal efficiency of the motor system during the process change control, the relationship between the efficiency of the motor system and the speed and the torque is established. The data measured by the actual vehicle determines the Range, the efficiency of the motor system was tested on a motor loading test rig and the results showed that the area of the measured drive motor system efficiency η> 80% accounted for 77.1% of the entire test area.Based on the least squares method, the efficiency of the motor system The surface fitting method was used to calculate the precision and operation workload of the fitting result, and the efficiency model of the motor system was established by using the quadratic function. The model was verified by the test results of some operating conditions of the driving motor. The results showed that the model calculation The maximum relative error between the measured value and the measured value is 3.9%. The established model is valid. The model can provide the basis for the optimization of control strategy based on the optimal efficiency of the motor system in the vehicle controller.