Songpon Klinchaeam and Pornchai Nivesrangsan

pp. 619 - 625

Abstract

This paper studies condition monitoring technique of a small four strokes, single cylinder petrol engine using vibration
signal analysis based on time domain, crank angle domain, and signal energy. Vibration signals are acquired from the cylinder
head of the engine and used to describe engine processes such as intake/exhaust valve operations, ignition process, and
combustion process. In this study, vibration signals have been applied to monitor various fault conditions in the engine such
as intake and exhaust valve clearance faults. Vibration signals acquired in time domain could be mapped onto crank angle
domain using top dead center signal. Time domain techniques were used to analyze vibration signals so that the main events
related to the engine operations could be described easily. Using energy analysis technique, all fault conditions could be
also identified. For future work, signal analysis techniques must be developed and the detected signals should be compared
with other signals such as pressure signal in order to verify the accuracy of the results.