| Key Words |
Knock sensor(노크센서), CKP(Crankshaft position sensor, 크랭크각도센서), CMP(Cam shaft position sensor, 캠각도센서), Engine misfire(엔진 실화), Engine vibration(엔진 진동), Amplifier & Filter(앰프필터) |
| 초록 |
The car engine cylinder is where fuel and air mix to make way for combustion. However, misfire may occur when there is a problem in the combustion process. Misfire can lead to increased emissions and abnormal engine vibration. Still, if the misfire problem is left unattended for a long time, it may damage expensive parts like the catalyst and the DPF(Diesel Particulate Filter). Therefore, it is very important to check the cylinder for misfire to reduce emissions and improve the durability of the engine. The objective of this study is to propose a method to diagnose misfire promptly by measuring abnormal cylinder vibration, in which the Knock Sensor, CKP, and CMP installed in the actual engine are used. The Knock Sensor detects vibration by installing the piezo component inside to convert the vibration magnitude into voltage form. However, an additional device is required to measure sensitive vibration changes. The Amplifier & Filter(AF) is designed to amplify the Knock Sensor\\\\\\\\\\\\\\\'s low voltage and eliminate unnecessary signals. Then, it is installed on the experimental engine. Also, the magnitude of the generated vibration of each combusting cylinder is analyzed by synchronizing CKP(crankshaft position sensor) and CMP(camshaft position sensor) with the Knock Sensor Signal. The measurement in the experiment is performed by removing the Fuel injector connector to produce normal engine vibration and misfire. Finally, the time domain method is used to analyze the measured vibration signal. |
