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1、 分类号：TB05 10710-2009122059 硕 士 学 位 论 文 均质压燃发动机燃料在线改质 改质室及其驱动系统的设计 张兆玮 导师姓名职称 张春化 教授 申请学位级别 工学硕士 学科专业名称 动力机械及工程 论文提交日期 2012 年 5 月 4 日 论文答辩日期 2012 年 5 月 16 日 学位授予单位 长安大学 答辩委员会主席 边耀璋 教授 学位论文评阅人 陈继勇 高工 蹇小平 教授 The Design of Reformer and Its Driving System of On-Board Fuel Reformation for an Homogeneous C
2、harge Compression Ignition Engine A Dissertation Submitted for the Degree of Master Candidate：Zhang Zhaowei Supervisor：Prof. Zhang Chunhua Changan University， Xian， China I 摘 要 近几十年以来，随着国民经济的发展，我国汽车保有量急剧增加，由此带来的经济和环境的影响日渐显著，降低汽车油耗和排放成了行业面临的巨大挑战。开发新一代的燃烧技术以缓解对石油资源的依赖并降低对环境的污染成为一项十分重要的任务。 均质压燃（HCCI，Ho
3、mogeneous Charge Compression Ignition）是一种全新的发动机燃烧方式，它是均质混合气在压缩过程中温度升高达到自燃温度后发生的燃烧现象，它的燃料来源广泛， 能够极大地降低 NOX和 PM 的排放， 因此成为内燃机领域内研究的热点。 燃料在线改质法是实现控制均质压燃（HCCI）和拓展其运行范围的一个十分积极的探索。改质室气门的电液驱动系统结构紧凑，可以实现可变气门正时，这种技术的采用大大提高了改质室气门运动的可控性， 使得改质室可以依据发动机的运行工况在最合适的时间送入改质气并截留已燃高温气体，以制备下一循环使用的改质气。 本文依据试验用 HCCI 发动机的构造及
4、特性，对燃料在线改质的改质室及其驱动系统进行了设计。通过查阅相关资料，对国内外近年的研究现状进行了介绍，并着重论述了配气机构不同系统的特点及应用情况。对均质压燃（HCCI）的概念和特性进行了介绍，对均质压燃运行范围的拓展、燃料改质进行了分析。根据均质压燃（HCCI）改质室的系统要求，提出了改质室的结构总体方案设计、完成了改质室配气系统液压元件的计算和设计。结合系统结构，对电控系统硬件要求、相关传感器和执行器进行了介绍，并完成了硬件电路和软件的总体设计。对相关电路进行了设计，包括单片机和电子元器件的选用等。根据系统需求，完成了控制软件设计和编程，模拟运行表明，可实现预定的控制功能。 关键词：可变
5、气门正时，均质压燃控制，燃料改质，电液驱动 Abstract In recent decades, with the development of the national economy, the inventory of automobile in our country increases dramatically. This brings us a great influence on economy and environment, and it has been a big challenge to decrease the automotive fuel consumption
6、and emissions. For the sake of lessening the dependence on oil resources and reducing the environmental pollution, the development of the new combustion technology becomes an extreme important issue. HCCI, Homogeneous Charge Compression Ignition, is a new combustion mode of the engine. This is one k
7、ind of combustion that happens after compressing the mixture of fuel and air to an auto-ignition temperature. A wide range of fuels can be used by HCCI engines. And HCCI has very low emissions of NOx and PM. Thus it becomes a popular research field of the development of the internal combustion engin
8、e. Fuel on-board reformation is a very positive research to realize the control of HCCI and extend the operation range. The electro hydraulic driving system of the reformer has a compact structure. It can realize variable valve timing and extraordinarily improve the controllability of the valve of t
9、he reformer. Thus the reformer may inject the reformed gas and then capture the high temperature burned gas in appropriate time according to the engine operation condition. In this thesis, the structure of reformer and its driving system are designed according to the structure and characteristics of
10、 the test HCCI engine. The paper introduces the current researches and the features of different valve systems after reviewing a lot of literatures. It also explains the concept and performances of HCCI, and analyzes the methods of extending the limit of the HCCI combustion and fuel reformation. Acc
11、ording to the demand of HCCI system, an overall design of the reformer is proposed, and the calculation and design of the hydraulic element of the driving system is carried out. Considering the structure of this system, the thesis describes the requirement of electronic control system, the relative
12、sensors and actuator, and accomplishes the hardware designing and software programming. And it designs the relative circuit, ECU and other electron components. Finally, the simulated results indicate that the system may achieve the expected functions. Key words: variable valve timing, control of HCCI, fuel modification, electro hydraulic drive III 目录目录 第一章 绪 论 . 1 1.1 引言 . 1 1.2 气门驱动系统的研究现状 . 2 1.2.1 机械式驱动 . 3 1.2.2 机电式驱动 . 5 1.2.3 电液式驱动 . 6 1.2.4 气动式驱动 . 7 1.3 本文的主要工作 . 8 第二章 均质压燃及燃料改质 . 9 2.1 均质压燃（HCCI）的概念和特点 . 9 2.2
