周兆鹏1,2，丁晓辉1,2，王慧1,2，李超1,2，杨文钊1,2,安学慧1,2

 1.内燃机可靠性国家重点实验室，山东潍坊261061；2.潍柴动力股份有限公司，山东潍坊261061

 摘要：为某轻型柴油机开发蝶阀排气制动辅助系统，通过仿真计算得到不同排气背压下的发动机制动功率，根据整车参数对整车需求制动功率进行仿真计算，综合考虑各种配套车型发动机制动功率需求，确定所需排气背压。通过发动机台架试验及整车性能试验验证，确认辅助制动性能满足制动系统技术标准要求；进行500 h耐久试验，验证了整车制动可靠性，结果表明开发的辅助制动系统满足性能及可靠性使用要求。

 关键词：轻型柴油机；制动功率；可靠性

 Abstract:The butterfly valve exhaust brake auxiliary system is developed for a light diesel engine. The relevant brake technology standards in China are studied, and the development direction is defined. The engine brake power under different exhaust back pressure is obtained through simulation calculation. According to the vehicle parameters, the vehicle brake power demand is simulated, and the engine brake power demand of various supporting models is comprehensively considered to determine the required exhaust power. The air back pressure is 260 kPa. Through the engine bench test and vehicle function test verification, it is confirmed that the auxiliary braking performance meets the technical standard requirements of the braking system; through the 500 h durability test, the development results meet the performance and reliability requirements.

 Keywords:light duty diesel engine; braking power; reliability