Evaluation of the operating range of partially premixed combustion in a multi cylinder heavy duty engine with extensive EGR

Magnus Lewander*, Bengt Johansson, Per Tunestal, Nathan Keeler, Simon Tullis, Nebojsa Milovanovic, Pär Bergstrand

*Corresponding author for this work

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

28 Scopus citations


Partially Premixed Combustion (PPC) is a combustion concept by which it is possible to get low smoke and NOx emissions simultaneously. PPC requires high EGR levels and injection timings sufficiently early or late to extend the ignition delay so that air and fuel mix extensively prior to combustion. This paper investigates the operating region of single injection diesel PPC in a multi cylinder heavy duty engine resembling a standard build production engine. Limits in emissions and fuel consumption are defined and the highest load that fulfills these requirements is determined. Experiments are carried out at different engine speeds and a comparison of open and closed loop combustion control are made as well as evaluation of an extended EGR-cooling system designed to reduce the EGR temperature. In this study the PPC operating range proved to be limited. The highest loads that fulfilled the emission criteria correspond to 30% of maximum load for conventional combustion at low speed and 21% of maximum load for conventional combustion at high speed. The effect of changes in combustion control was small while a reduced EGR temperature could increase the operating range significantly.

Original languageEnglish (US)
Title of host publicationSAE Technical Papers
StatePublished - 2009
Externally publishedYes

ASJC Scopus subject areas

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

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