宽带氧传感器用于发动机失火检测的研究

Study on a Wide Range Oxygen Sensor for the Engine Misfire Detection

介绍了一种使用宽带氧传感器进行发动机失火检测的方法,在发动机各种工况下对该方法的有效性进行了试验研究。试验结果表明,使用氧传感器信号的差分信号可以更清楚地从正常燃烧中辨别出失火,差分信号波动的幅值可作为失火检测的监测参数。由于氧传感器的反应速度随发动机转速的增加而增加,因而该方法可以检测高速(5500r/min)工况下发生的失火。

In this study a new concept of misfire detection in spark ignition engine using a wide-range oxygen sensor is introduced,and the validity of this method is studied in different engine working conditions.The results show that a misfire could be distinguished more clearly from normal combustion through the differentiation of the wide-range oxygen sensor signal,so in this study the range of fluctuation of differentiated signal is used as misfire detection signal.h is found that the response speed of oxygen sensor increases with engine speed,therefore,the method can detect misfire accurately in all the engine states, even when the engine speed is high,such as 5 500 r/min.