Flame propagation and knock detection using an optical fiber technique in a spark-ignition engine

Kwang Min Chun, Seonghoon Kim, Tacksoo Kim

Research output: Contribution to conferencePaper

Abstract

In this research, an optical system for the detection of the flame propagation under the non-knocking and knocking conditions is developed and applied to a mass produced four cylinder SI engine. The normal flames are measured and analyzed under the steady state operating conditions at various engine speeds. For knocking cycles, the flame front propagations before and after knock occurrence are simultaneously taken with cylinder pressure data. In non-knocking and knocking cycles, flame propagation shows cycle-by-cycle variations, which are quite severe especially in the knocking cycles. The normal flame propagations are analyzed at various engine speeds, and show that the flame front on the exhaust valve side becomes faster as the engine speed increases. According to the statistical analysis, knock occurence location and flame propagation process after knock can be categorized into five different types. The squish region between intake and exhaust valve is the primary knock occurrence region.

Original languageEnglish
DOIs
Publication statusPublished - 1993 Dec 1
Event7th International Pacific Conference and Exposition on Automotive Engineering - Phoenix, AZ, United States
Duration: 1993 Nov 151993 Nov 19

Other

Other7th International Pacific Conference and Exposition on Automotive Engineering
CountryUnited States
CityPhoenix, AZ
Period93/11/1593/11/19

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, S., & Kim, T. (1993). Flame propagation and knock detection using an optical fiber technique in a spark-ignition engine. Paper presented at 7th International Pacific Conference and Exposition on Automotive Engineering, Phoenix, AZ, United States. https://doi.org/10.4271/931906