探究增压直喷机型机油稀释的影响因素及解决方法  

Investigation on the Cause of Oil Dilution of TDI Engine and Methods to Solve the Oil Dilution Problem

作　　者：贾殿臣[1,2] 王凯[1,2] 刘佳庆[1,2] 张士伟[1,2] 吴宜兵 段景辉[1,2] 

机构地区：[1]长城汽车股份有限公司技术中心,河北保定071000 [2]河北省汽车工程技术研究中心

出　　处：《小型内燃机与摩托车》2014年第4期24-28,共5页Small Internal Combustion Engine and Motorcycle

摘　　要：机油稀释现象是发动机常见的试验表象之一,尤其是增压缸内直喷汽油发动机,机油稀释较明显。机油发生稀释后会破坏机油使用性能,降低运动粘度,严重时还导致机油压力下降,零部件功能丧失,发动机可靠性下降。主要分析一款1.8L GDI缸内增压直喷发动机产生机油稀释的影响因素进而对机油牌号、机油温度、水温、SOI角度、曲轴箱通风系统、活塞漏气量、喷油器布置方式进行Benchmark分析及优化验证,为改善增压直喷发动机机油稀释现象提供解决方法,机油稀释包括燃油喷射稀释和机油挥发稀释,重点探究的方向是燃油喷射稀释。Abstract： Oil dilution is one of the usual phenomena that happen during engine test, and for TDI gasoline engine that phenomenon is more obvious than that of NA engine. Oil dilution could disable oil from its normal functions and lower its dynamic viscosity; in worse cases that would cause decrease of oil pressure, failure of moving parts and drop of engine＇s reliability. In this paper factors having influence on oil dilution of one TDI engine with a displacement of 1.8L have been investigated, and in order to find out methods to solve that oil dilution phenomenon benchmark analysis and optimization variation have been done with oil type, oil temperature, coolant temperature, SOI angle, crankcase breath system, piston blow by and layout of fuel injector. Oil dilution includes both fuel injection dilution and oil evaporation dilution, in this paper fuel injection dilution has been investigated.

关 键 词：机油稀释 运动粘度 机油压力 SOI 

分 类 号：U461[机械工程—车辆工程]