Supercharged homogeneous charge compression ignition (HCCI) with exhaust gas recirculation and pilot fuel

Magnus Christensen*, Bengt Johansson

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

100 Scopus citations

Abstract

In an attempt to extend the upper load limit for Homogeneous Charge Compression Ignition (HCCI), supercharging in combination with Exhaust Gas Recirculation (EGR) have been applied. Two different boost pressures were used, 1.1 bar and 1.5 bar. High EGR rates were used in order to reduce the combustion rate. The highest obtained IMEP was 16 bar. This was achieved with the higher boost pressure, at close to stoichiometric conditions and with approximately 50 % EGR. Natural gas was used as the main fuel. In the case with the higher boost pressure, iso-octane was used as pilot fuel, to improve the ignition properties of the mixture. This made it possible to use a lower compression ratio and thereby reducing the maximum cylinder pressure. The tests were performed on a single cylinder engine operated at low speed (1000 rpm). The test engine was equipped with a modified cylinder head, having a Variable Compression Ratio (VCR) mechanism. Altering the position of a secondary piston in the cylinder head enabled a change of the compression ratio. The secondary piston was controlled by a hydraulic system, which was operated from the control room.

Original languageEnglish (US)
DOIs
StatePublished - Dec 1 2000
EventInternational Spring Fuels and Lubricants Meeting and Exposition - Paris, France
Duration: Jun 19 2000Jun 22 2000

Other

OtherInternational Spring Fuels and Lubricants Meeting and Exposition
CountryFrance
CityParis
Period06/19/0006/22/00

ASJC Scopus subject areas

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

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