Measurement and analysis of knock in a SI engine using the cylinder pressure and block vibration signals

Kwang Min Chun, Kyung Woon Kim

Research output: Contribution to conferencePaper

33 Citations (Scopus)

Abstract

In this study, spark-ignition engine knock was studied experimentally. Cylinder pressure and cylinder block vibration of a four cylinder SI engine were measured. Knock characteristics, such as knock intensity, knock cycle percentage, knock occurrence crank angle, were determined from pressure and vibration signals using different analysis methods. Methods using band-pass filter, third derivative and step method, which was developed in this study, were shown to be the most suitable. The step method only used signals above threshold value during knocking and, as a result, both pressure and vibration signal analysis results with this method showed good signal-to-noise ratio. The knock intensities calculated from cylinder pressure and block vibration were proportional to each other over a wide range. It was confirmed in this study that vibration signals were useful in knock detection. More accurate results were achieved by using narrow band-pass filtering frequency range which avoided engine's resonance frequencies.

Original languageEnglish
DOIs
Publication statusPublished - 1994 Dec 1
Event1994 SAE International Congress and Exposition - Detroit, MI, United States
Duration: 1994 Feb 281994 Mar 3

Other

Other1994 SAE International Congress and Exposition
CountryUnited States
CityDetroit, MI
Period94/2/2894/3/3

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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    Chun, K. M., & Kim, K. W. (1994). Measurement and analysis of knock in a SI engine using the cylinder pressure and block vibration signals. Paper presented at 1994 SAE International Congress and Exposition, Detroit, MI, United States. https://doi.org/10.4271/940146