关键词: 行驶工况；电动车辆；电磁兼容（EMC）；电磁干扰（EMI）；试验方法；辐射发射特性

Abstract: This paper analyzes the mechanism of radiation emission from electric drive system of electric vehicles, and consideres that its radiation emission is greatly affected by vehicle driving conditions. It is considered that vehicle driving conditions are not clearly defined in existing electromagnetic compatibility test standards, which may lead to inaccurate measurement results. This paper makes a theoretical analysis on the driving resistance of vehicles in electromagnetic compatibility test, and compares the difference between look-up table method and sliding method in setting driving resistance. This paper selects an electric vehicle. The driving resistance is set by the look-up table method. The radiation emission under different driving conditions is studied, and the influence law of driving conditions on the vehicle radiation emission is summarized. Then the actual road driving resistance is set by the sliding method, and the test is repeated. Through comparing the two test results, it shows that the sliding method should be used to set the vehicle driving resistance as much as possible, which can improve the accuracy of measurement.

Key words: Driving conditions; Electric vehicles; Electromagnetic Compatibility (EMC); Electromagnetic interference (EMI); Test method; Radiation emission