离子信号法在点燃式发动机中的应用研究  

Research and Application of the Method of Ionic Signal to SI Engine

作　　者：吴筱敏[1] 李福明[1] 汪映[1] 杜卫宁[1] 

机构地区：[1]西安交通大学能动学院汽车系,西安710049

出　　处：《内燃机工程》2005年第4期66-68,共3页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(50276049)

摘　　要：通过在发动机火花塞两端加直流电压后获得离子信号,该信号主要由点火、火焰初期和燃烧后期三部分组成,并分析了发动机处于正常燃烧、爆震以及失火三种状态下,燃烧后期离子信号的主要区别。用带通滤波法(K.I)和原始数据峰值法(Pmax)计算后表明,K.I<0.05或Pmax>10V时正常燃烧,K.I>0.05时有爆震,Pmax<10V时失火。故该方法是一种简单有效的燃烧测量法,可用于爆震的在线测量和失火的故障诊断。That ionic signal consists chiefly of ignition, flame-front and post flame, and especially the main differences of the signal in the post flame when the engine works with normal combustion, knock and misfire separately have been analyzed by the method adding DC voltage between the spark gap in S. I engine. Methods both band-pass filter（K. I） and peak raw data （Pmax）are used to calculate, and the results show thatas K. I〈0.05 or Pmax2〉IOV there is normal combustion,as K. I〉0.05 there is knock and as Pmax〈10V there is misfire. So this method is a valuable and simple method of monitoring combustion, and can be used to online detection of knock and the diagnoses of misfire.

关 键 词：内燃机 火花点火发动机 燃烧 离子信号 失火 爆震 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]