Investigation of the Combustion Characteristics with Focus on Partially Premixed Combustion in a Heavy Duty Engine

Research output: Contribution to journalArticle


Partially Premixed Combustion (PPC) has shown its potential by combining high combustion controllability with emission characteristics that are close to those of an HCCI engine. In order to get PPC the ignition delay needs to be long enough for the fuel and air to mix prior to combustion. This can be achieved by injecting the fuel sufficiently early while running with high EGR.In order to find out where and how PPC occurs a map that shows the changes in combustion characteristics with injection timing and EGR was created. The combustion characteristics were studied in a six cylinder heavy duty engine where the Start of Injection (SOI) was swept from early to late injection over a wide range of EGR levels. The emissions were monitored during the sweeps and in the most promising regions, with low emissions and high efficiency, additional changes in injection pressure and engine speed were applied to get a more versatile picture of the combustion.


  • Magnus Lewander
  • Kent Ekholm
  • Bengt Johansson
  • Per Tunestål
  • Nebojsa Milovanovic
  • Nathan Keeler
External organisations
  • Delphi Diesel Systems
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering
Original languageEnglish
Article number2008-01-1658
Pages (from-to)1063-1074
Number of pages12
JournalSAE International Journal of Fuels and Lubricants
Issue number1
Publication statusPublished - 2008 Jun 23
Publication categoryResearch
EventSAE International Powertrains, Fuels & Lubricants Congress - Shanghai
Duration: 2008 Jun 23 → …