【作者】 张志永；

【导师】 李岳林；

【作者基本信息】 长沙理工大学 ， 载运工具运用工程， 2007， 硕士

【摘要】 与通常的稳态工况相比,汽油机在非稳定的瞬态工况下工作时,其排放量和燃油消耗量较大,在一定程度上制约了汽油机动力性和经济性的提高。本课题的研究是针对汽油机瞬态工况所面临的某些问题,通过对汽油机恒转矩增转速和恒转速增转矩两种工况下燃烧过程的研究,力争在前人研究的基础上,寻求汽油机恒转矩增转速和恒转速增转矩两种瞬态工况下的燃烧规律,优化汽油机瞬态过程。根据试验目的、内容和方法,首先建立了以汽油机为主要研究对象的试验台架,包括压力传感器、曲轴转角传感器、燃烧分析仪、电荷放大器、发动机水恒温控制仪、电涡流测功机以及发动机测试控制仪等较为全面的试验系统,然后进行了相关的汽油机瞬态试验以及相对应的稳态试验,最后利用燃烧分析仪软件和内燃机燃烧后处理软件进行了燃烧数据的处理和分析,总结出汽油机瞬态工况的燃烧规律。全文共分六章:第一章阐述了汽油机瞬态工况燃烧特性研究的意义及国内外研究的现状,提出了本文将要进行的主要研究工作和研究的基本思路。第二章的主要内容是对汽油机的瞬态工况进行理论分析,提出了瞬态工况的定义,特点以及瞬态工况的分析方法。第三章介绍了实验的台架布置以及主要的实验设备。第四章主要工作是对实验数据进行采集。介绍了实验工况的控制,详细地描述了实验的过程。对系统标定、上止点位置的确定等诸方面进行了较为详细的考虑,并对其实验结果进行了记录。第五章主要工作是对实验数据进行处理,并对汽油机恒转矩增转速和恒转速增转矩两种工况下示功图进行分析。总结出汽油机瞬态运行工况下的一些燃烧规律。最后一章给出了本文的结论与展望。更多还原

【Abstract】 Compared with the usually steady operating conditions, the exhaust emissions and fuel consumption of gasoline engine under transient operating conditions are much more, which limits automobile dynamical characteristic and fuel economic characteristic on a certain degree.This paper study the combustion process of gasoline engine under constant torque increasing speed operating condition and constant speed increasing torque operating condition, seek the combustion regulations, disclose the reason why the exhaust emissions and fuel consumption of gasoline engine under transient operating conditions are more than under steady condition, optimize the work process of gasoline engine under transient operating conditions.According to the experimental aim, content and method, the test-bed of gasoline engine including pressure sensor, crank angle sensor, combustion analyzer, charge amplifier, water temperature controller, electric eddy current dynamometer, engine control system and so on are established. This can be used to do the experiments under steady operating conditions and transient operating conditions. Analysed the experiment data and get some combustion regulations of gasoline engine under transient operating conditions.The paper contains following six contents.The significance and present condition of investigation on gasoline engine combustion characteristics under transient operating conditions are expounded, the main works that this paper will make and research thinking are presented in chapter1.Some theories about transient operating condition in gasoline engine, the definition, characteristics and analyze method about transient operating condition are proposed in chapter2.The test-bed and main experiment devices are introduced in chapter3.The data of experiment is collected and recorded, how to control the work conditions is introduced and experiment process is described. The effects of systemic calibration, TDC and so on are also considered in chapter4.Deal with the experiment results, analysis the indicator diagrams of gasoline engine under constant torque increasing speed operating condition and constant speed increasing torque operating condition in chapter5.The research conclusions and prospects of the paper are presented at last.更多还原