Homogeneous Charge Compression Ignition (HCCI) using isooctane, ethanol and natural gas - A comparison with spark ignition operation

Magnus Christensen*, Bengt Johansson, Patrik Einewall

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

213 Scopus citations

Abstract

The Homogeneous Charge Compression Ignition (HCCI) is the third alternative for combustion in the Internal Combustion (IC) engines. Here, a homogeneous charge is used as in a spark ignited engine but the charge is compressed to auto-ignition as in a diesel. The characteristics of HCCI were compared to SI using a 1.6 liter single cylinder engine with compression ratio 21:1 in HCCI mode and 12:1 in SI mode. Three different fuels were used; isooctane, ethanol and natural gas. Some remarkable results were noted in the experiments: The indicated efficiency of HCCI was much better than for SI operation. Very little NOx was generated with HCCI, eliminating the need for a LeanNOx catalyst. However, HCCI generated more HC and CO than SI operation. Stable and efficient operation with HCCI could be obtained with λ=3 to λ=9 using isooctane or ethanol. Natural gas, with a higher octane number, required a richer mixture to run in HCCI mode.

Original languageEnglish (US)
DOIs
StatePublished - Dec 1 1997
EventInternational Fall Fuels and Lubricants Meeting and Exposition - Tulsa, OK, United States
Duration: Oct 13 1997Oct 16 1997

Other

OtherInternational Fall Fuels and Lubricants Meeting and Exposition
CountryUnited States
CityTulsa, OK
Period10/13/9710/16/97

ASJC Scopus subject areas

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

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