【作者】 张长坤；

【导师】 黄大明； 韦志康；

【作者基本信息】 广西大学 ， 农业机械化工程， 2007， 硕士

【摘要】 本文介绍了虚拟仪器的概念、LabVIEW软件开发平台的组成及其在发动机测试中的运用情况。根据实验室现有的试验设备和条件，利用虚拟技术做出发动机气缸压力采集与燃烧分析系统，该系统由发动机缸压数据采集和数据分析软件组成。由采集系统采集缸压数据，随后将这些原始数据经过多循环平均化处理、数据光顺、压力漂移修正、上止点校正等数据处理，得到光顺的示功图。接着在该示功图数据的基础上分析有关的各种信息如压力升高率、概率密度分布以及p-V示功图等。该系统还支持由使用者输入各种参数，基于这些参数和示功图数据可供进一步分析和揭示发动机缸内燃烧过程。运用本系统测量了丰田8A发动机额定功率下的示功图并进行了分析，验证了系统的可行性。测试系统的测试软件是由虚拟仪器LABVIEW图形语言编制的，同一般的编程语言相比，使用更加简捷方便，开发过程更加简单，大大缩短了开发周期。本系统具有以下的优点高性能、经济性、易操作性、用户界面美观友好以及系统的易维护性。更多还原

【Abstract】 In this paper the concept of virtual instruments, the composition of LabVIEW and how they have been applied in engines testing. According to current equipment in laboratory, engine pressure acquisition and combustion analysis system are investigated. The system consists of engine cylinder acquisition and combustion analysis system. Engine cylinder pressure acquisition get the original data , The acquired data was processed by multiple- cycle data smoothness process, pressure drift correction, top dead center correction, etc. As a result ,the relate information abort the P-θcurve can be obtained such as pressure gradient, probability density and so on. The user can input parameter they needed。Base on these parameter and P-θcurve, they can get more information and do father research on.The virtual instrument have been tested by testing Toyota-8A engine the P-θcurve, the result showed that connecting virtual instruments with engines is feasible.The measure software is based on the technology of "Virtual Instrument" of National Instruments with software platform-LabVIEW. Comparing with the common program language, VI is more convenient and simpler, it can shorten the developing periods of the program in large scales. The combustion analysis system has the following advantages: high performance, low cost, easy to learn and manipulate, friendly user interface and high maintainability更多还原