基于配气正时的柴油机高排气背压性能优化  

Valve Timing Based Optimization of Diesel Engine with High Exhaust Back Pressure

作　　者：邹玉红[1,2] 卢勇[1,2] 裴普成[1,2] 

机构地区：[1]清华大学汽车工程系,北京100084 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《车用发动机》2014年第6期39-44,共6页Vehicle Engine

基　　金：国家自然科学基金资助项目(51176082)

摘　　要：针对目前柴油机在高排气背压下泵气功损失增加、残余废气系数升高、燃油经济性下降等性能恶化的问题,提出通过优化配气正时来解决此类问题的方案。利用GT-Power软件对LD1110单缸柴油机建立仿真计算模型,对上述解决方案进行了分析研究。计算结果表明:排气背压为0.3MPa、进气提前角保持不变、喷油量为45mg时,柴油机在转速2 200r/min下通过优化排气晚关角可以使平均有效压力提高28.33%,有效燃油消耗率降低22.08%;排气背压由0.1MPa增大到0.3MPa时,通过配气正时优化,柴油机在转速2 000r/min下平均有效压力的损失可减小12.8%,有效燃油消耗率的增加可降低27.1%。For the problems of larger pump loss ,higher residual gas coefficient and worse fuel economy at high exhaust back pressure ,the scheme of optimizing the valve timing was put forward .With GT‐Power software ,the model of LD1110 single‐cylinder diesel engine was built and the optimization of valve timing was analyzed .The results showed that the brake mean ef‐fective pressure （BMEP） and the brake specific fuel consumption （BSFC） improved by 28 .33% and 22 .08% respectively by optimizing the exhaust late close angle at 2 200 r/min with 0 .3 MPa exhaust back pressure ,45 mg fuel injection per cycle and constant intake valve timing .When the exhaust back pressure increased from 0 .1 MPa to 0 .3 MPa at 2 000 r/min ,the BMEP loss and the BSFC increase could decrease by 12 .8% and 27 .1% respectively .

关 键 词：柴油机 排气背压 配气正时 平均有效压力 有效燃油消耗率 

分 类 号：TK412.3[动力工程及工程热物理—动力机械及工程]