Abstract: With the development of society, the sales of electric vehicles have grown rapidly every year, the ministry of Industry and Information Technology has become more and more stringent in the regulation of the range of battery electric vehicles and the restrictions on energy consumption, therefore, the energy consumption must meet the requirements of regulations, so the accuracy of the test results has higher requirements. This article mainly analyzes the coasting principle of the chassis dynamometer, and then analyzes the motor torque difference of the chassis dynamometer before and after the test, which can compare and reflect the battery electric vehicle's range accuracy, this also provide better guidance for the development and application of transmission systems in the future.

Key words: Chassis dynamometer; Range testing; Battery electric vehicles

摘要： 随着社会的发展，电动汽车销量每年迅速增长，工信部对电动汽车续航里程的监管和 能耗的限制越来越严格。因此，其续航结果和能耗必须满足法规要求，故对测试结果的准确 度有较高的要求。文章主要对底盘测功机的滑行原理进行分析，进而分析出实验前后的底盘 测功机的电机扭矩差异，能够对比反映出续航准确度，该方法为今后传动系统的开发与应用 也能提供较好的指导作用。

关键词: 底盘测功机；续航测试；纯电动汽车