基于Taguchi方法的多段预混压燃发动机喷油策略优化  

Injection Strategy Optimization for a Multiple Premixed Compression Ignition Engine Based on Taguchi Method

作　　者：俞林君 王志[1] 王步宇[1] 张庆朋 帅石金[1,3] 

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084 [2]烟台大学机电汽车工程学院,山东烟台264005 [3]北京电动车辆协同创新中心,北京100084

出　　处：《内燃机学报》2018年第1期1-9,共9页Transactions of Csice

基　　金：国家自然科学基金资助项目(51276097)

摘　　要：在一台4缸柴油机上使用一种低辛烷值G80混合燃料(汽油和柴油的体积比为80∶20)进行了多段预混压燃(MPCI)模式的研究.通过Taguchi试验设计方法和方差分析,解析了喷油时刻、喷油比例等变量对燃烧和排放性能的影响,结果表明:指示燃油消耗率和NO_x排放主要受次喷时刻影响,碳烟排放主要受首喷时刻影响.基于上述结果,协同优化喷油时刻和喷油比例,实现了低于原柴油机的NO_x、碳烟排放和指示燃油消耗率.通过能量利用分析,发现低传热损失和低排气损失是G80压燃发动机获得高指示热效率的主要原因.Multiple premixed compression ignition （MPCI） combustion mode was investigated in a four-cylinder diesel engine fueled with a low octane number fuel named G80 （80% gasoline and 20% diesel by volume）. By applying Taguchi method and analysis of variance （ANOVA）, the effect of double injection timings and fuel split ratio on combustion and emissions was studied. The results show that the second injection timing mainly affects the indicated specific fuel consumption （ISFC） and indicated specific nitrogen oxides （ISNOx）, while the first injection timing affects the soot emission. The injection timings and split ratio were optimized to achieve lower ISFC, ISNOx and soot emis- sions simultaneously with GS0 fuel compared with diesel. It is found by energy balance analysis that low heat transfer loss and low exhaust loss are the main reason of high thermal efficiency of G80.

关 键 词：柴油机 低辛烷值燃料 多段预混压燃 方差分析 

分 类 号：TK442[动力工程及工程热物理—动力机械及工程]