考虑电机热耦合对纯电动客车整车经济性能的影响

Influence of the motor’s thermal coupling on pure electric buses’ vehicle economy

为了探究电机温度的变化对纯电动客车整车经济性能存在的影响,提出了开展基于电机热耦合的整车建模方法研究,并在考虑电机热耦合的情况下,研究电机温度变化对纯电动客车整车经济性能的影响情况。首先,利用ANSYS软件进行电机模型的热仿真分析,获得电机的温升变化参数作为验证Simulink整车建模仿真的热分析结果准确性的依据;然后,基于Simulink软件构建纯电动客车的电机热耦合模型,为研究电机温升对整车经济性能影响奠定基础;最后,在考虑电机热耦合情况下,开展电机温升对纯电动客车整车经济性能影响的仿真研究,并与台架试验进行对比分析。研究结果表明,在同等工况下,电机温度过高的时候,其百公里耗电量减少,行驶路程减少,电池剩余电量百分比(SOC)增大,续驶里程增大。

In this article, in order to explore the influence of motor-temperature changes on the vehicle economy of pure electric buses, the method of vehicle modeling based on electro-meclianical coupling is proposed. With the motor’s thermal coupling taken into consideration, the influence of motor-temperature changes on pure electric buses’ vehicle economy is explored. Firstly, the thermal analysis is conducted on the motor model with the help of the ANSYS software, and the temperature-rising parameters are worked out as the basis to verify that the results obtained from the thermal analysis on Simulink vehicle modeling and simulation is accurate. Then, by means of the Simulink software, the motor’s thermal electro-meclianical coupling of pure electric buses is set up, which lays the foundation for exploring the influence of motor-temperature rise on pure electric buses’ vehicle economy. Finally, with the motor’s thermal coupling taken into account, the influence of the motor-temperature rise on pure electric buses’ vehicle economy is subject to simulation, and the results are compared with those obtained from the bench test. These results show that under the same conditions, when the motor temperature is too high, power consumption per 100 km decreases, the driving distance decreases, SOC increases, and the driving range rises.