哈尔滨应用职业技术学院毕业设计（论文）
摘 要
稀薄燃烧是指空燃比大于17的燃烧。这种技术最大的特点就是燃烧效率高，经济环保，同时还可以提高发动机的输出功率。爆燃不易发生。在发动机满足日益严格的排放法规前提下,不断加剧的能源危机和温室效应正推动着改善发动机燃油经济性的技术进步。在大气环境污染日益严重,而排放法规日益苛刻的今天,天然气作为一种清洁燃料,已经成为车用发动机未来燃料的首选。合理的采用天然气发动机燃烧控制技术,不但可使天然气发动机保持原有发动机的动力性,而且还能降低成本,提高发动机的经济性。
关键字：稀薄燃烧格；技术；发展；影响
I
哈尔滨应用职业技术学院毕业设计（论文）
Abstract
Lean burn is refers to the air-fuel ratio greater than 17 combustion. A key feature is the high combustion efficiency, economy and environmental protection, but also can improve the output power of the engine. Deflagration is not easy to happen. In the engine to meet the emission regulations under the premise of the increasingly strict, the energy crisis and the greenhouse growing is promoting the improvement of technological progress of engine fuel economy. In the atmosphere environment pollution is serious, and the emission regulation becomes more and more severe today, natural gas as a clean fuel, has become the engine of future fuel of choice. The use of natural gas engine combustion control technology is reasonable, not only can make the natural gas engine to keep the momentum of the original engine, but also reduce the cost, improve the economy of the engine.
Keywords: lean combustion; technology; development; influence
II
哈尔滨应用职业技术学院毕业设计（论文）
目录
摘 要 ......................................................................................................................................... I Abstract ...................................................................................................................................... II 绪 论 ........................................................................................................................................ 1 第1章 稀薄燃烧发动机概述 .................................................................................................. 2
1.1相关特点 ....................................................................................................................... 2
1.1.1空燃比 ................................................................................................................. 2 1.1.2分层稀薄燃烧的分类 ......................................................................................... 2 1.1.3燃烧效率等 ......................................................................................................... 2 1.2所需条件 ....................................................................................................................... 2
1.2.1提高压缩比 ......................................................................................................... 2 1.2.2分层燃烧 ............................................................................................................. 3 1.2.3高能点火 ............................................................................................................. 3 1.3发动机实例 ................................................................................................................... 3
1.3.1三菱缸内喷注汽油机 ......................................................................................... 3 1.3.2大众直喷汽油发动机 ......................................................................................... 3 1.3.3本田VTEC发动机 ............................................................................................ 4 1.4稀薄燃烧发动机的优缺点 ........................................................................................... 4
1.4.1对经济性的改善 ................................................................................................. 4 1.4.2对排放的改善 ..................................................................................................... 4 1.4.3稀薄燃烧发动机的不足 ..................................................................................... 5
第2章 稀薄燃烧发动机的电子控制 ...................................................................................... 6
2.1进气管分层稀薄燃烧的电子控制 ............................................................................... 6 2.2缸内直喷分层稀薄燃烧的电子控制 ........................................................................... 6
2.2.1缸内直喷技术 ..................................................................................................... 6 2.2.2关键技术 ............................................................................................................. 6 2.2.3技术手段 ............................................................................................................. 6 2.3 GDI的两种燃烧模式 ................................................................................................... 6
2.3.1分层稀燃模式 ..................................................................................................... 6 2.3.2均质稀燃模式 ..................................................................................................... 7 2.4丰田D-4缸内直喷系统 ............................................................................................... 7 2.5三菱4G系列缸内直喷系统 ........................................................................................ 7 2.6三菱4G系列缸内直喷系统 ........................................................................................ 7
2.6.1主要控制内容 ..................................................................................................... 7 2.6.2喷油正时的控制 ................................................................................................. 7 2.6.3喷油压力的控制 ................................................................................................. 8
第3章 稀薄燃烧发动机的技术发展 ...................................................................................... 9
3.1稀燃的定义 ................................................................................................................... 9 3.2稀薄燃烧发动机的发展现状 ....................................................................................... 9 3.3稀燃的关键技术 ......................................................................................................... 10
3.3.1提高压缩比 ....................................................................................................... 10 3.3.2分层燃烧 ........................................................................................................... 10 3.3.3高能点火 ........................................................................................................... 10
稀薄燃烧发动机毕业论文
