Engine knock detection for a multifuel engine using engine block vibration with statistical approach

Ismail, Muhammad; Fawzi, Mas; Taweekun, Juntakan; Leevijit, Theerayut

doi:10.1016/j.mex.2021.101583

Cited by 10 publications

(2 citation statements)

References 38 publications

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“…Studies show that the amplitude of filtered vibration signals could be used for detecting the occurrence of knock and even for developing a knock index to classify the knock [26]. Ismail et al [27] used a statistical approach to determine the occurrence of knock by comparing it with the knock index calculated using the engine block vibrations and the knock threshold. The vibration signal captured from the engine block contains the signals generated by all the moving parts in the engine.…”

Section: Introductionmentioning

confidence: 99%

Engine block vibrations: An indicator of knocking in the SI engine

Joseph,

Thampi

2023

FME Transactions

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The factors influencing the onset of knocking have a significant impact on how well a SI engine performs. Hence, the efficacy in determining the onset and controlling of knock is a key factor in improving the SI engine's performance. This paper provides insight into the role of engine block vibrations in determining the occurrence of knock using Empirical Mode Decomposition and Short-Time Fourier Transform. To comprehend the behaviour of vibration amid normal combustion and knocking conditions, the engine block vibration signals are analyzed and compared with the incylinder pressure fluctuations. The features of knock are extracted from the engine block vibration signals using Empirical Mode Decomposition. The first Intrinsic Mode Function (IMF) thus obtained is used to generate the Hilbert spectrum for detecting the occurrence of knock. Similarly, ShortTime Fourier Transform is also performed on the first IMF to obtain the spectrogram. The findings demonstrate unequivocally that higher frequency variations are produced when knock occurs. These results also indicate that the combination of Empirical Mode Decomposition and Short-Time Fourier Transform can be used effectively for determining the occurrence of knock.

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Section: Introductionmentioning

confidence: 99%

Engine block vibrations: An indicator of knocking in the SI engine

Joseph,

Thampi

2023

FME Transactions

View full text Add to dashboard Cite

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“…This technique promotes the early detection of faults and prevents complete failure of equipment. For example, [2] provided an alternative engine knock detection technique based on engine block vibration. A model of failure ranking and sorting in gas compression plants using the risk priority number was developed by [3] .…”

Section: Introductionmentioning

confidence: 99%