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

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