Abstract
The torsional vibration signal of a reciprocating internal combustion engine is a useful tool for monitoring the operating state of the engine, similar to the pulse signal in our body, which serves as the basic diagnostic tool in oriental medicine for assessing the pathogenesis of the human body. In comparison with several other methods for detecting a misfiring cylinder, a method employing the torsional vibration signal is considered to be highly effective in terms of accuracy, time, and cost. This study proposes a method for detecting a misfiring cylinder using the measured torsional vibration signal. The fundamental frequency amplitude and phase angle of the torsional vibration signal are found to distinguish the misfire occurrence and misfiring cylinder position, respectively. The proposed method is verified by analysis and numerical simulation using two-stroke, four-stroke, in-line, and V-type engines.
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