基于能量等效和加速度等效的电动汽车电惯量的模拟

Electrical inertia simulation for electric vehicles based on energy equivalent and acceleration equivalent

为在电动汽车前期设计开发阶段,就能够测试和评估车辆的能耗,提出基于能量等效和加速度等效的两种电动汽车电惯量模拟方法。运用加速度等效的电惯量模拟原理,采用时间修正和转矩修正两种方式,对电惯量模拟台架进行转速补偿,以弥补台架模拟与车辆消耗的能量差。通过理论论证及仿真,并进行混合惯量台架试验,对比这两种方法的加速度和能量模拟效果。加速度等效电惯量模拟方法适用于电动汽车传动系统动力性测试,而本文提出的能量等效电惯量模拟方法更适用于以能量转换为重点的测试。因而,可综合采用两种方法模拟电动汽车在加速工况下的动力性和能耗特性。

Two electrical-inertia-simulation methods were proposed based on acceleration equivalent and based on energy equivalent respectively to test and evaluate the energy consumption in the early stages of development of the electric vehicles. According to the principle of acceleration equivalent simulation, either time correction or torque correction was adapted to compensate the energy difference between bench simulation and vehicle consumption. Two methods for electrical inertia simulation, the energy equivalent and the equivalent acceleration, were compared to their advantages and applied fields by theoretical analysis and simulation testing. The results show that the acceleration equivalent method is suitable for the dynamic performance test, and the proposed energy equivalent method is more suitable for the test of energy consumption. Therefore, the combination of the two inertia simulation methods can be used to simulate the dynamic performance and energy consumption characteristics of the electric vehicles.