摘  要
CNG是清洁燃料，在发动机应用中相对于汽油燃料具有排放性好和经济性高的优势。而且我国的天然气储量巨大。在汽车中应用CNG燃料，可以充分利用现有的资源，减轻汽车的尾气排放并提高车辆运营的经济性。 限于我国汽车工业的发展，专用的CNG燃料发动机尚不多见，CNG加气站等配套设施也不完善。因此借助汽油机进行CNG燃料的应用研究，开发CNG和汽油两用燃料的发动机系统具有重大现实意义。本文主要介绍天然气的发展前景，两用燃料发动机燃气系统的组成，工作原理、常见故障及排除。着重讲了燃气供给与调节系统改装工艺及工作原理，两用燃料汽车实现了动力性、经济性和排放污染少的要求。也分析了两用燃料发动机的故障及检修，并举出相关案例，丰富了两用燃料汽车故障诊断资料，也对汽车维修行业有着重大意义。
 
关键词：两用燃料；燃气供给与调节系统改装工艺；故障及排除
Abstract
CNG is a clean fuel, which has the advantages of good emission and high economy compared with gasoline fuel in engine application. Moreover, China has huge natural gas reserves. The application of CNG fuel in automobiles can make full use of existing resources. To reduce vehicle exhaust emissions and improve the economy of vehicle operation. Limited to the development of China's automobile industry, The special CNG fuel engine is not very common, and the supporting facilities such as the CNG filling station are not perfect. Therefore, the application research of CNG fuel is carried out with the aid of gasoline engine. It is of great practical significance to develop the engine system of CNG and gasoline dual-fuel. This paper mainly introduces the development of natural gas. Prospect, composition, working principle, common malfunction and troubleshooting of gas system of dual-fuel engine. The refitting technology and working principle of gas supply and regulation system are emphasized, and the power performance of dual-fuel vehicle is realized. This paper also analyzes the failure and maintenance of dual-fuel engine, and gives some related cases, which enriches the fault diagnosis data of dual-fuel vehicle and has great significance for the automobile maintenance industry.
 
Keywords: dual fuel; refitting technology of gas supply and regulation system; malfunction and troubleshooting
 
 
 




目  录
摘  要 I
Abstract I
目  录 II
第一章 绪论 4
1.1 课题目的及意义 4
1.1.1课题目的 4
1.1.2课题意义 4
1.2国内外研究现状 5
1.2.1 国外研究现状 6
1.2.2 国内研究现状 6
1.3研究主要内容 7
第二章  两用燃料发动机的改装工艺设计 7
2.1两用燃料汽车的介绍 7
2.1.1两用燃料发动机控制系统的组成 8
2.2燃气供给与调节系统 8
2.2.1燃气供给与调节系统的功能 8
2.2.2燃气供给与调节系统的组成 8
2.3工作原理 12
2.3.1汽油/CNG两用燃料发动机工作原理 12
2.3.2柴油/CNG两用燃料发动机工作原理 14
第三章  两用燃料发动机典型故障及排除 16
3.1天然气汽车常见故障及排除方法 16
3.1.1启动困难 16
3.1.2频繁熄火 16
3.1.3动力性能差 16
3.1.4突发故障 17
3.1.5燃气时燃料消耗过多 17
3.1.6储气瓶中天然气不能用尽 18
3.2天然气汽车的故障诊断流程 18
3.3两用燃料系统汽车的检修 18
3.4天然气（两用燃料）发动机使用燃气同燃油为燃料时相比，现存的主要问题 19
3.5两用燃料汽车的使用注意事项 20
3.6两用燃料发动机使用中出现的问题及检修 22
第四章  两用燃料发动机故障案例分析 26
4.1轿车富康简介 26
4.1.1富康燃气供给系统的布置 26
4.1.2汽油/天然气两用燃料汽车维护的分类及其周期 27
4.1.3富康１.８ＣＮＧ两用燃料汽车故障４例 27
第五章  总结与展望 32
致  谢 33
参考文献 34