火花塞离子电流传感器在发动机敲缸探测上的应用  

Spark Plug as an Ionization Sensor in Engine Knock Detection

作　　者：吴筱敏[1] 李福明[1] 蒋德明[1] 王子延[1] 

机构地区：[1]西安交通大学,西安710049

出　　处：《西安交通大学学报》2000年第9期25-27,共3页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目! (598760 30 )

摘　　要：提出了一种直接利用火花塞作为检测传感器测量发动机爆震的新方法 .通过在火花塞电极两端加偏置电压 ,测量燃烧过程中流经火花塞的离子电流 ,从而判断发动机是否爆震 .在DA4 62 -A四缸汽油机上进行了大量的试验研究 ,采集出了爆震与非爆震时的离子电流信号 ,发现有爆震时会出现一定频率的高频信号叠加在离子电流信号上 .对所采集的信号进行快速傅里叶变换 (FFT) ,确定试验用发动机爆震的特征频域为 1 0～ 1 1kHz .试验结果证明 ,火花塞作为离子电流传感器是探测火花点火发动机爆震的有效便捷方法 .A method is presented for monitoring knock in automobile engine. It uses a spark plug as an ionization sensor. By applying bias voltage across the spark plug, ionic current takes place. Knock is detected when ionic current prevails with different frequency. Experiments are done on a four cylinder type DA462-A. Test results show that engine with knock or without knock produces high frequency ionic signal or smooth signal respectively. Fast Fourier transform is used to analyze the data. The characteristic frequency domain (10～11 kHz) of engine knock is obtained. The use of spark plug as an ionization sensor is an efficient and convenient method for the knock measurement of SI engine.

关 键 词：火花塞 爆震 离子电流传感器 敲缸探测 

分 类 号：TK407[动力工程及工程热物理—动力机械及工程]