A Potentiality of dedicated EGR system for improving thermal efficiency in natural gas SI engines

Sejun Lee, Kyohei Ozaki, Takahiro Sako, Norimasa Iida

Research output: Contribution to journalArticle

1 Citation (Scopus)


Object of this study is to realize improving thermal efficiency and emission reduction with low temperature combustion. EGR is a solution to low temperature combustion, however it occurs burning velocity decrease. To prevent this phenomenon, Dedicated EGR was adjusted to SI engine run by natural gas. The entire exhaust gas of a single cylinder operated by the equivalence ratio varied from lean to rich was recirculated to the other cylinders. Due to H2 and CO included in EGR, slowed burning velocity problem was overcome with increasing degree of constant volume, thus thermal efficiency could be improved.

Original languageEnglish
Pages (from-to)15-22
Number of pages8
JournalInternational Journal of Automotive Engineering
Issue number1
Publication statusPublished - 2015



  • Exhaust gas recirculation
  • Heat engine
  • Laminar burning velocity
  • Low temperature combustion
  • Numerical calculation
  • Spark ignition engine
  • Thermal efficiency [A1]

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Human Factors and Ergonomics

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