发动机排气压力波性能仿真分析  

Simulation and Analysis of Engine Exhaust Pressure Wave

作　　者：范晓梅[1] 许勇[1] 杨群立[1] 陈溢文 

机构地区：[1]桂林电子科技大学计算机与控制学院,广西桂林541004 [2]桂林激光通信研究所,广西桂林541004

出　　处：《计算机仿真》2010年第2期282-285,共4页Computer Simulation

基　　金：国家自然科学:发动机监测与故障诊断系统(60745001/F030402)

摘　　要：研究汽车排气系统内压力波的形成及其传播过程与发动机工作状况之间的关系,为及时诊断故障,利用GT-POWER软件建立一个四缸四行程的汽油发动机模型。计算结果显示在发动机的一个工作周期内,压力波出现了四个波峰和波谷,分别对应四个汽缸的排气行程;修改发动机的转速,会影响排气压力波的幅值、谐波成分、相位等参数;在排气行程末期,排气压力波在排气管内发生干涉、叠加和负压效应。结果对利用排气压力波进行发动机的综合故障诊断具有重要意义。To study the relationship between the formation and dissemination of pressure wave and engine working condition,this paper creates a four - cylinder four - stroke gasoline engine model with GT - POWER software. The results show that four pressure wave crests and troughs have appeared, corresponding to the four - cylinder exhaust travel respectively. When the engine speed is modified, exhaust pressure will affect the amplitude of the wave, harmonic components, phase , and other parameters. At the end of exhaust trip, interference, superposition, negative effect of exhaust pressure wave will occur in the exhaust pipe. The results are of great significance to engine integrated fault diagnosis using exhaust pressure wave.

关 键 词：排气压力波 排气系统 排气系统模型 仿真 

分 类 号：TP302.7[自动化与计算机技术—计算机系统结构] U495[自动化与计算机技术—计算机科学与技术]