Boosting for high load HCCI

Jan Ola Olsson*, Per Tunestål, Bengt Johansson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

92 Scopus citations

Abstract

Homogeneous Charge Compression Ignition (HCCI) holds great promises for good fuel economy and low emissions of NOX and soot. The concept of HCCI is premixed combustion of a highly diluted mixture. The dilution limits the combustion temperature and thus prevents extensive NOX production. Load is controlled by altering the quality of the charge, rather than the quantity. No throttling together with a high compression ratio to facilitate auto ignition and lean mixtures results in good brake thermal efficiency. However, HCCI also presents challenges like how to control the combustion and how to achieve an acceptable load range. This work is focused on solutions to the latter problem. The high dilution required to avoid NOX production limits the mass of fuel relative to the mass of air or EGR. For a given size of the engine the only way to recover the loss of power due to dilution is to force more mass through the engine. This paper shows that this can be done by the use of turbo charging or a mechanically driven compressor. The cost of forcing more air through the engine and the higher peak pressure requirements are discussed and quantified by simple engine modeling supported by experimental data.

Original languageEnglish (US)
Title of host publication2004 SAE World Congress
DOIs
StatePublished - Dec 1 2004
Event2004 SAE World Congress - Detroit, MI, United States
Duration: Mar 8 2004Mar 11 2004

Other

Other2004 SAE World Congress
CountryUnited States
CityDetroit, MI
Period03/8/0403/11/04

ASJC Scopus subject areas

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

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