基于WLTC工况的电动汽车能量流测试与分析

Energy Flow Test and Analysis of Electric Vehicle Based on WLTC Mode

为研究电动汽车的能量流,首先对比了WLTC工况与NEDC工况,证明了WLTC工况更能反映整车行驶过程中的能耗特性,然后基于WLTC工况,依据电能部分的能量流测试方案,综合考虑车辆行驶过程中机械能、电能的流动方向和大小,建立纯电动汽车行驶过程中的能量流数学模型,最后,根据模型中各系统或零部件输入与输出的瞬时值与累计值计算其能量传递效率,从而从整车级、系统级、零部件级全面评价测试车辆能耗特性。

To study the energy flow of electric vehicle,this paper firstly compares the WLTC cycle with the NEDC cycle,and proves that the WLTC cycle can reflect the energy consumption characteristics of the vehicle in driving better than the NEDC cycle.Then,the energy flow mathematical model of battery electric vehicle is established based on WLTC cycle and according to energy flow test plan of electric power,comprehensively considering flow direction and size of mechanical energy and electric power of vehicle in driving.Finally the energy transfer efficiency is calculated according to the instantaneous value and cumulative value of input and output of each system or component in the energy flow mathematical model,thus the energy consumption characteristics from the vehicle level,system level and component level are evaluated and tested.