关键词: 增程式混动车辆；排气系统；热辐射；CFD；环境舱；隔热板

Abstract: With the development of the automobile industry and the proposal of the national “carbon neutral” strategy, new energy vehicles have become more popular, but the frequent occurrence of spontaneous combustion and other thermal accidents of new energy vehicles has caused consumers to doubt their reliability. How to improve vehicle reliability and reduce vehicle thermal damage risk has become the focus of research and development personnel. Based on a project of the extended-range hybrid vehicle development, through computational fluid dynamics (CFD) simulation analysis and thermal balance test, the temperature field of exhaust system and its peripheral components are studied, and found that the insulation of heat transfer, by using the heat shield, can effectively reduce the exhaust system thermal pollution impact on the surrounding parts, reduce the risk of the vehicle thermal pollution.

Key words: Extended-range hybrid vehicle; Exhaust system; Thermal radiation; CFD; Environmental chamber; Heat shield