Combustion timing in HCCI engines determined by ion-sensor: Experimental and kinetic modeling

P. Mehresh*, J. Souder, D. Flowers, U. Riedel, R. W. Dibble

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

92 Scopus citations


The ion current signal in homogenous charge compression ignition (HCCI) engines is studied to show that a measurable ion current exists even in the very lean combustion in an HCCI engine. An ion sensor signal is observed in a propane-fueled HCCI engine, which can be used in place of the expensive pressure transducers currently used in research engines. The ion sensor is equally capable of capturing cycle-to-cycle variations in HCCI combustion. A numerical model using detailed chemistry was developed for HCCI combustion and used to predict the ion concentration in the cylinder. The model results agree with experimental findings. The ion signal becomes stronger with increases in equivalence ratio and intake temperature. Due to the low temperature and high pressure HCCI combustion, the N2O mechanism contributes significantly to the total NOx production. In some cases, the N2O route produces more NOx than the Zeldovich route. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).

Original languageEnglish (US)
Pages (from-to)2701-2709
Number of pages9
JournalProceedings of the Combustion Institute
Volume30 II
Issue number2
StatePublished - 2005
Externally publishedYes
Event30th International Symposium on Combustion - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004


  • Flame ionization
  • HCCI
  • Ion sensor
  • Modeling
  • NO

ASJC Scopus subject areas

  • General Chemical Engineering
  • Mechanical Engineering
  • Physical and Theoretical Chemistry


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