小型通用汽油机尾气排放控制

发布时间：2018-02-12 03:18

本文关键词： 通用汽油机法规 G200F 排放控制　出处：《天津大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文就市场需求量较大的G200F通用汽油机尾气排放控制进行研究,分析国内外竞争产品的排放性能与控制方法,结合本专业所学知识,从企业实际需求出发,通过燃烧室优化,活塞活塞环组合优化,化油器匹配等技术手段,展开了一系列机内净化改进措施,取得了以下成果：1.通用汽油机燃烧室的面容比S/V对尾气排放影响较大,将浴盆型燃烧室更改为蓬型燃烧室可有效降低其面容比S/V;2.燃烧室罅隙对通用汽油机尾气排放影响较大,减小活塞头部、活塞环和气缸壁之间的狭小缝隙可有效降低通用汽油机尾气排放；3.化油器供油特性对通用汽油机尾气排放影响较大,通过扫描法找出各工况最佳供油量可找出汽油机最佳排放供油曲线。通过燃烧室优化,活塞活塞环组合优化,化油器匹配等机内净化技术手段,使G200F通用汽油机的尾气排放在基本不增加成本的基础上,达到全球最严格的EPA三阶段排放法规要求。为通用汽油机尾气排放控制提供了经济可行的方法,具有较高的指导与借鉴意义。
[Abstract]:In this paper, the exhaust emission control of G200F general gasoline engine with large market demand is studied, and the emission performance and control methods of domestic and foreign competitive products are analyzed. According to the knowledge of this specialty, the combustion chamber is optimized according to the actual demand of the enterprise. By means of piston piston ring combination optimization and carburetor matching, a series of in-machine purification improvement measures have been carried out, and the following results have been obtained: 1.The face capacity of the combustion chamber of a general-purpose gasoline engine has a greater impact on exhaust gas emissions than S / V, Changing the bathtub combustion chamber to a canopy combustor can effectively reduce the face volume ratio of the combustion chamber to S / V 2. The crack of the combustion chamber has a great influence on the exhaust emission of the general gasoline engine and reduces the piston head. The narrow gap between the piston ring and the cylinder wall can effectively reduce the exhaust emission from the general gasoline engine. The fuel supply characteristics of the carburetor have great influence on the exhaust emission of the general gasoline engine. By scanning method, the optimum fuel supply curve of gasoline engine can be found out, and the internal purification technology means, such as combustion chamber optimization, piston piston ring combination optimization, carburetor matching, etc, can be found. The exhaust emission of the G200F gasoline engine can meet the requirements of the world's most stringent three-stage EPA emission regulations without increasing the cost. It provides an economical and feasible method for the exhaust emission control of the general gasoline engine. It has higher guidance and reference significance.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK411.5

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