Publication: Study on engine fault diagnosis from knocking and signal uncertainty behaviour
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Date
2024-07-01
Authors
Ajmir, Mohd Saill
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Abstract
Engine knocking is a condition where the engine experiences severe vibration that can cause engine damage. It happens due to pre ignition or spark plug timing too early. Researchers found that knocking occurs cause of substance in the combustion chamber produced auto ignite beyond combustion stroke or power stroke. Apart from that the data indicated the occurrence of knocking after TDC. To identify the occurrence of knocking, a test engine table is used. It is built to simplify the testing process. For the engine control system, a zener diode and a diode circuit assembled with an Arduino UNO are used to replace the original engine control unit. It is to facilitate control of ignition time. The signal from the crank position sensor is used for spark plug ignition control. Using the program set in the Arduino UNO system, it is able to receive the signal from the crank position sensor and send it back to the spark plug system to ignite the fuel in the combustion chamber. The engine control system is tested repeatedly to ensure that it is able to function smoothly. The knock sensor is mounted on the engine block, where it is the most efficient place to get engine knock The bolts used to mount the knock sensor will be in contact with the engine block. The program set on the Arduino UNO will activate five seconds of artificial signals with an interval of Ims. This will result in an indeterminate state of the spark plug signal. Data was acquired using Instrustar Data Acquisition (DAQ) 2 channel. It is connected to a laptop with VirAnalyser software. Properties taken are spark plug timing, flame size and knock signal sensor. The combination of the data can determine the position of the duration of the flame, where normal knock, moderate knock and extreme knock occur. The results obtained, the largest knock identified at 30.221x10'ms, the speed of 4173 rpm produced 5.776 V. This shows that the size of the knock gets stronger with short pre-spark time, while the speed increases.