HCCI combustion phasing in a multi cylinder engine using variable compression ratio

Göran Haraldsson*, Per Tunestål, Bengt Johansson, Jari Hyvönen

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

95 Scopus citations


Combustion phasing in a Homogeneous Charge Compression Ignition (HCCI) engine can be achieved by affecting the time history of pressure and temperature in the cylinder. The most common way has been to control the inlet air temperature and thereby the temperature in the cylinder at the end of the compression stroke. However this is a slow parameter to control, especially cycle to cycle. A multi cylinder engine using Variable Compression Ratio (VCR) for controlling the compression temperature and consequently the combustion phasing is used in the experiments. Operating range in terms of speed and load is investigated in naturally aspirated mode. Trade-off between inlet air temperature and Compression Ratio (CR) is evaluated. Primary reference fuels, isooctane / n-heptane, are used during the tests. High speed HCCI operation up to 5000 rpm is possible with a fuel corresponding to RON 60. The effect of octane number with and without exhaust cam phasing is also investigated. Brake thermal efficiency of 33% at a maximum load of 4.4 bar BMEP for 2000 rpm is achieved.

Original languageEnglish (US)
StatePublished - Dec 1 2002
EventPowertrain and Fluid Systems Conference and Exhibition - San Diego, CA, United States
Duration: Oct 21 2002Oct 24 2002


OtherPowertrain and Fluid Systems Conference and Exhibition
Country/TerritoryUnited States
CitySan Diego, CA

ASJC Scopus subject areas

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


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