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满足美国EPA-Ⅲ阶段尾气排放的通用小型汽油机开发研究

发布时间:2018-12-28 18:16  文章来源:笔耕文化传播
【摘要】:论文通过对隆鑫生产的1P65FC通用小型汽油机尾气排放的研究,通过开展台架试验,结合排放污染物产生机理、数值模拟技术,对原机的进排气系统、化油器供油系统等进行优化,展开了一系列机内净化改进措施,取得了以下成果:(1)降低配缸间隙和活塞火力岸高度,配以减薄活塞环,采用轻量化活塞,实现了活塞和活塞环的轻量化;将燃烧室形状从传统的浴盆形更改为半球形,增大了气缸的充气效率;(2)优化后的进、排气道,获得稳定的高强度滚流,改善了气流流动特性;斜置气门布置以及增加气门与气门座圈流通截面积,更利于燃油与空气均匀混合,改善了燃烧和混合气特性;合适的压缩比,使汽油机工作更温和;(3)优化化油器主要零部件,改善了混合气的供给特性,提高汽油机的稳定性;配以优化后的点火线圈,调高了点火能量,改善了汽油机的动力性和经济性。通过对上述一系列零部件和结构系统的优化、改进,再结合排放污染物产生机理和数值模拟技术,开发出了满足美国EPA-Ⅲ阶段排放法规的小型汽油机,对于隆鑫进入美国通用汽油机市场,具有重要的意义,同时也提升、更新了国内小型汽油机的排放技术,提高了价格竞争优势,为企业赢得了利益。
[Abstract]:Through the research on the exhaust gas emission of the 1P65FC general purpose gasoline engine produced by Longxin, the paper optimizes the intake and exhaust system and carburetor oil supply system of the original engine by means of bench test, combined with the emission mechanism and numerical simulation technology. A series of improvement measures have been carried out, and the following achievements have been achieved: (1) reducing the cylinder gap and the height of the piston fire bank, the piston ring is thinned, and the lightweight piston is adopted to realize the lightweight of the piston and piston ring; The combustion chamber shape is changed from the traditional bathtub shape to the hemispherical shape, which increases the aeration efficiency of the cylinder. (2) the optimized intake and exhaust channels can obtain stable high intensity rolling flow and improve the flow characteristics of the air flow. The inclined valve arrangement and the increase of the flow section area between the valve and valve seat ring are more favorable to the uniform mixing of fuel and air, and improve the combustion and mixture characteristics, and the proper compression ratio makes the gasoline engine work more mildly. (3) the main parts of carburetor are optimized to improve the supply characteristic of the mixture and the stability of the gasoline engine, and the ignition energy is increased with the optimized ignition coil, and the power and economy of the gasoline engine are improved. By optimizing and improving the above series of components and structural systems, combining with the emission mechanism and numerical simulation technology, a small gasoline engine is developed to meet the EPA- 鈪,

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