当量比下EGR对天然气发动机性能影响的研究  

Influence of EGR with Stoichiometric Operation on CNG Engine Performance

作　　者：李垂孝 朱昌吉[1] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,吉林长春130025

出　　处：《小型内燃机与车辆技术》2015年第2期16-19,共4页Small Internal Combustion Engine and Vehicle Technique

摘　　要：在一台增压中冷天然气发动机上,研究了理论当量混合气条件下EGR对天然气发动机性能的影响。结果表明:在2000 r/min,λ=1及一定的点火提前角(上止点前35°CA)条件下,通入不同的EGR率,在小、大负荷联合三元催化转化器可以很好地控制排放在很低的水平;不同负荷下小的EGR率对经济性及动力性影响较小,大EGR率对经济性恶化明显。For understanding the effect of EGR under Stoichiometric Operation on CNG engine perfor- mance, some experiments have been done in a CNG engine with turbocharged and intercooled system. The results show that on the condition of stoichiometric combustion and the best sparking advance angle （SAA= 35deg BTDC） at RPM=2000r/min, the full and part load with a three way catalyst diluted with EGR can control the emission in a very low level; the effect of the low-EGR is not very obvious for the economic and power characteristics, and the high-EGR will make the economic characteristics deteriorate.

关 键 词：CNG发动机 理论空燃比 燃烧EGR 排放 经济性 动力性 

分 类 号：U464.174[机械工程—车辆工程]