【作者】 任国峰；

【导师】 张雨；

【作者基本信息】 长沙理工大学 ， 载运工具运用工程， 2006， 硕士

【摘要】 随着人们环保意识的加强,要求治理汽车尾气的呼声也日渐高涨。控制汽车排放尾气的一个较为有效的办法就是对在用车施行定期的排放检测。目前对在用汽车的尾气排放检测已逐步由稳态工况检测过渡到瞬态工况检测。瞬态工况检测对检测设备的成本要求比较高,且操作也比较复杂。本文考虑利用稳态排放测量仪器AVL DiGas 4000 Light型五组份排放分析仪,运用间接检测手段,开发汽油机瞬态排放间接检测系统。所做的一些主要工作如下:①基于Win32通信API函数实现了计算机和AVL五组份排放分析仪之间的串行通信,利用计算机控制AVL五组份排放分析仪获取排放数据。②利用Windows多线程技术,解决了瞬态工况控制和排放数据获取的同步问题,实现了二者之间的无缝联接。③基于VisualC++6.0开发平台,开发了文档/视图结构的单文档控制软件,并采用指针动画的形式实时显示节气门开度和汽油机转速,利用DAO数据库技术将检测到的排放数据保存到计算机硬盘中。④利用Matlab和VC++的混和编程,实现了Matlab平台下的单缸Shannon熵计算程序在检测系统中的集成。所开发的间接检测系统通过实验检验,不但能够同步控制被测汽油机的瞬态工况并获取该工况下的瞬态排放数据;还可以采用符号时间序列方法的单缸Shannon熵评价汽油机的瞬态排放状况。更多还原

【Abstract】 With the consciousness strengthen of people’s environment protection; the claim to solve automobile exhaust emission is gradually rising. One of the most effective methods to control automobile exhaust emission is to detect its emission conditions timely. At present, the working-conditions of detecting exhaust emission, which aims at the in-use vehicles, is gradually transiting from stable working-conditions to transient working-conditions. Therefore the cost of measure equipments that can detect transient emission is comparatively higher, and its operation is also complex.In order to develop a transient emission indirectly detecting system (TEIDS) for spark-ignited engines, a stable emission measure instrument that is a five components exhaust analyzer with the type of AVL DiGas 4000 Light is considered in this thesis. The means of indirect detecting is adopted. The research items are as follows:①The serial communications between the control computer and AVL five components exhaust analyzer is carried out based on the Win32 communication API functions, the emission data is obtained through making using of the computer to control the AVL five components exhaust analyzer.②The request of synchronous and without gap for controlling transient working-conditions and obtaining transient emission data is met by making use of Windows multithread technology.③The single document control software of document/view structure is designed according to the Visual C++ 6.0 developing platform. The throttle opening degree and spark-ignited engine rotating speed are simultaneously displayed in the form of needle animation. The emission data measured is preserved in computer hard drive by utilizing DAO database technology.④The integration of calculating program, which can calculate single cylinder Shannon entropy under Matlab platform in the TEIDS, is also achieved by utilizing mixed programming between Matlab and VC++ .The developed TEIDS is tested through experiment examination, the following conclusion is reached: it can not only synchronously control the transient working-conditions of spark-ignited engine measured and obtain更多还原