许晓颖，刘近报^*，周峰，于佳，田红霞，李志杰

潍柴动力股份有限公司，山东 潍坊 261061

摘要：针对某柴油机性能开发过程中出现的机油过早老化现象，进行试验与燃烧仿真分析，机油过早老化的原因为油束落点异常使机油内含碳量增加，造成大颗粒物超出限值。采用增大柴油机压缩比、减小喷油器油束等措施进行改进，试验结果表明:优化改进后的柴油机落点异常的油束和机油中的颗粒物大幅减少，解决了机油老化问题。

关键词：柴油机；机油老化；燃烧优化

Abstract：Aiming at the premature aging of diesel engine oil during the performance development process, the test and combustion simulation analysis are carried out to find out the cause of premature aging of the engine oil. The result shows that the abnormal falling position of oil droplet increases the carbon content in oil and causes the large particles to exceed the limit, which is the cause of oil premature aging. By increasing the compression ratio of diesel engine and decreasing the angle of fuel spray, it is found that the abnormal falling point of fuel spray and the particles in the fuel spray are greatly reduced,the problem of oil aging is solved.

Keywords:diesel engine; oil aging; combustion optimization