This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Investigation of the Combustion Characteristics with Focus on Partially Premixed Combustion in a Heavy Duty Engine
- Magnus Lewander - Lund University ,
- Kent Ekholm - Lund University ,
- Bengt Johansson - Lund University ,
- Per Tunestål - Lund University ,
- Pär Bergstrand - Volvo Powertrain ,
- Nebojsa Milovanovic - Delphi Diesel Systems, UK ,
- Nathan Keeler - Delphi Diesel Systems, UK ,
- Tony Harcombe - Delphi Diesel Systems, UK
ISSN: 1946-3952, e-ISSN: 1946-3960
Published June 23, 2008 by SAE International in United States
Citation: Lewander, M., Ekholm, K., Johansson, B., Tunestål, P. et al., "Investigation of the Combustion Characteristics with Focus on Partially Premixed Combustion in a Heavy Duty Engine," SAE Int. J. Fuels Lubr. 1(1):1063-1074, 2009, https://doi.org/10.4271/2008-01-1658.
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.