This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Effect of Charge Air and Fuel Injection Parameters on Combustion with High Levels of EGR in a HDDI Single Cylinder Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
Annotation ability available
When increasing EGR from low levels to levels corresponding to low temperature combustion, soot emissions first start to increase (due to reductions in soot oxidation), before decreasing to almost zero (due to very low rates of soot formation). At the EGR level where soot emissions start to increase, the NOx emissions are still low, but not low enough to comply with future emission standards. The purpose of this study was therefore to investigate the possibilities for moving the so-called “soot bump” (increase in soot) to higher EGR levels or reducing the magnitude of the soot bump. This involved an experimental investigation of parameters affecting the combustion and thus the engine-out emissions. The parameters investigated were: charge air pressure, injection pressure, EGR temperature and post injection (with different dwell times) for a wide range of EGR rates. The goal was to find a suitable combination of operational parameters at which both NOx and soot engine-out emissions are minimized, with a minimal fuel consumption penalty. A single cylinder heavy duty direct injection diesel engine, operating at 50% load, with an electronically controlled unit injector with variable needle opening pressure was used in the experiments. Its geometry is based on the Volvo D12C engine in which the compression ratio has been reduced from 18.5 to 14.
The results show that high charge air pressure, low EGR temperature and high injection pressure are important parameters for achieving low emissions. Post injection was found to have limited effects on the emissions, at least under the investigated conditions. Very low soot emissions could be obtained, but the NOx emissions remain too high and need to be further reduced in order to comply with future emission standards.
CitationAlriksson, M., Gjirja, S., and Denbratt, I., "The Effect of Charge Air and Fuel Injection Parameters on Combustion with High Levels of EGR in a HDDI Single Cylinder Diesel Engine," SAE Technical Paper 2007-01-0914, 2007, https://doi.org/10.4271/2007-01-0914.
- Alriksson, M., Rente, T., and Denbratt, I., “Low Soot, Low NOx in a Heavy Duty Diesel Using High Levels of EGR”, SAE paper 2005-01-3836; 2005
- Sasaki, S., Ito, T., and Iguchi, S., “Smoke-less Rich Combustion by Low Temperature Oxidation in Diesel Engines”, 9.Achener Kolloquium Fahrzeug- und Motorentechnik, 2000, p. 767-788
- Miles, P.C., Choi, D., Picket, L.M., Henein, N., RempelEwert, B.A., Yun, H. and Reitz, R.D., “Rate-Limiting Processes in Late-Injection, Low-Temperature Diesel Combustion Regimes”, THIESEL, 2004
- Kook, S., Bae, C., Miles, P.C., Choi, D. and Pickett, L.M., “The Influence of Charge Dilution and Injection Timing on Low-Temperature Diesel Combustion and Emissions”, SAE paper 2005-01-3837, 2005
- Alriksson, M., and Denbratt, I., “Low Temperature Combustion in a Heavy Duty Diesel Engine Using High Levels of EGR”, SAE paper 2006-01-0075, 2006
- Kimura, S., Aoki, O., Ogawa, H., Muranaka, S., and Enomoto, Y., “New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines”, SAE paper 1999-01-3681; 1999
- Ogawa, H., Kimura, S., Koike, M., and Enomoto, Y., “A Study of Heat Rejection and Combustion Characteristics of a Low-Temperature and Pre-mixed Combustion Concept Based on Measurement of Instantaneous Heat Flux in a Direct-Injection Diesel Engine”, SAE paper 2000-01-2792; 2000
- Ladommatos, N., Abdelhalim, S. and Zhao, H., “The Effects of Exhaust Gas Recirculation on Diesel Combustion and Emissions”, Int J Engine Research, 2000, vol 1, no 1, p. 107-126
- Benajes, J., Molina, S. and Garcia, J.M., “Influence of Pre- and Post-Injection on the Performance and Pollutant Emissions in a HD Diesel Engine”, SAE paper 2001-01-0526; 2001
- Montgomery, D.T., and Reitz, R.D., “Effects of Multiple Injections and Flexible Control of Boost and EGR on Emissions and Fuel Consumption of a Heavy-Duty Diesel Engine”, SAE paper 2001-01-0195; 2001
- Gjirja, S., Olsson, E., Eklund, A. and Hedemalm, P., “A New Paraffinic Fuel Impact on Emissions and Combustion Characteristics of a Diesel Engine”, SAE paper 2002-01-2218; 2002
- Ehleskog, R., Golovitchev, V., Denbratt, I., Andersson, S., and Rinaldini, C.A.., “Experimental and Numerical Investigation of Split Injections at Low Load in a HDDI Diesel Engine Equipped with a Piezo Injector”, SAE paper 2006-01-3433; 2006