车用二冲程发动机排放控制与分析.

目录

摘要.......................................... I Abstract........................................ II

第一章绪论 (1)

1.1本课题研究目的与意义 (1)

1.2车用二冲程摩托车排放在国外、国内研究现状 (1)

1.2.1国外摩托车和轻便摩托车排放标准 (1)

1.3.1我国车用二冲程摩托车排放标准 (2)

第二章二冲程发动机结构与基本原理与分析 (4)

2.1车用二冲程发动机结构特点 (4)

2.1.1二冲程汽油机结构及工作原理 (4)

2.2二冲程发动机主要性能指标与特性 (6)

2.2.1发动机的主要性能指标 (6)

2.2.2车用二冲程发动机排放特性 (8)

2.3车用二冲程发动机有害排放物的来源及成因 (9)

2.3.1CO生成机理 (9)

2.3.2碳氢化合物HC的生成机理 (9)

2.3.3氮氧化物NOx的生成机理 (10)

第三章控制车用二冲程发动机排放途径与分析方法 (11)

3.1国内车用二冲程发动机控制排放的途径 (11)

3.1.1电喷技术 (11)

3.1.2废气再循环系统 (11)

3.1.3汽油蒸发控制系统 (12)

3.2目前车用二冲程发动机主要采取的控制方法 (12)

3.2.1二次空气喷射系统的应用 (12)

3.2.2排气催化转化器系统的应用 (13)

3.2.3曲轴箱窜气污染物的控制 (14)

结论 (15)

致谢 (16)

参考文献 (17)

摘要

随汽车工业的发展和汽车保有量的增加，其大气环境的污染日趋严重。因此，世界各国已相应地制定法规标准，而且随着节能和环保意识的提高，对汽车排放控制的法规标准日趋强化。我国摩托车产品在不采取专门的净化措施的情况下，二冲程产品几乎达不到标准，每年将有400万辆摩托车排放不达标，形势非常严峻，因此研究摩托车排放控制技术非常重要。

针对车用二冲程发动机结构与原理的分析，调整车用二冲程发动机化油器的安装位置，采用催化转化技术，合理布置催化器并采用合乎规格的催化器。通过试验分析：对比控制前后排放性能。改进后二冲程发动机保持了体积小、重量轻、功率大、机构简单、维修方便等突出优点，同时又解决了其存在的油耗高、排气污染严重的问题。力争在不降低发动机动力性的基础上，实现二冲程发动机低排放、高效率和高经济的技术要求。

关键词：二冲程；发动机；排放；控制

Abstract

With the development of the automobile industry and the increase in cars, The atmospheric pollution of the environment has become increasingly serious.Therefore, all countries in the world has been a corresponding development of regulations and standards, and along with energy-saving and environmental protection awareness,Control of vehicle emission control regulations and standards and regulations become more enhanced. Motorcycle products in China do not take special measures in the case of purification, almost two-stroke products are not up to standard, Each year there will be four million motorcycle emissions standards do not, the situation was very serious, Therefore, the study of motorcycle emission control technology is very important.

For two-stroke engine vehicle structure and principles of analysis, Adjust the vehicle's two-stroke carburetor engine placement, the use of catalytic converter technology, Rational arrangement of the use of catalytic converters and catalytic converters meet the specifications. Through experimental analysis: Compared before and after the emission control performance. Improved two-stroke engine has maintained a small size, light weight, power, and institutions simply to highlight the advantages of easy maintenance. Solved at the same time, the existence of the high fuel consumption, exhaust pollution problem. Strive to reduce the engine power is not based on the realization of two-stroke engine with low emissions, high efficiency and high technical requirements.

Keywords:two-stroke; engine; emissions; control