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Diesel Engine Combustion Control: Medium or Heavy EGR?
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2010 by SAE International in United States
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Exhaust Gas Recirculation (EGR) is an important parameter for control of diesel engine combustion, especially to achieve ultra low NOx emissions. In this paper, the effects of EGR on engine emissions and engine efficiency have been investigated in a heavy-duty diesel engine while changing combustion control parameters, such as injection pressure, injection timing, boost, compression ratio, oxygenated fuel, etc. The engine was operated at 1400 rpm for a cycle fuel rate of 50mg. The results show that NOx emissions strongly depend on the EGR rate. The effects of conventional combustion parameters, such as injection pressure, injection timing, and boost, on NOx emissions become small as the EGR rate is increased. Soot emissions depend strongly on the ignition delay and EGR rate (oxygen concentration). Soot emissions can be reduced by decreasing the compression ratio, increasing the injection pressure, or burning oxygenated fuel. The effect of boost on soot emissions depends on the EGR rate. With increased boost, soot emissions decreased below the medium EGR rate, but the peak soot value increased. With heavy EGR, Low Temperature Combustion (LTC) occurred with ultra low NOx and soot emissions simultaneously, NOx emissions meet Euro VI regulations without any DeNOx aftertreatment. However, the fuel efficiency of LTC is much lower than that of conventional diesel combustion with ultra high HC and CO emissions. The “Trade-off” of soot-NOx for conventional combustion changes to a “Trade-off” of soot-fuel efficiency (HC and CO emissions). With medium EGR, there is almost no fuel penalty, HC, CO and soot emissions are low, but NOx emissions cannot meet Euro VI without aftertreatment. Further analysis indicated that the emissions and fuel efficiency could be optimized by changing following: the injection timing, injection pressure, boost, and adding oxygenated fuel. Therefore, the authors think that diesel combustion controlled by medium EGR is a promising method to meet future emissions regulation with high fuel efficiency.
CitationYao, M., Zhang, Q., Liu, H., Zheng, Z. et al., "Diesel Engine Combustion Control: Medium or Heavy EGR?," SAE Technical Paper 2010-01-1125, 2010, https://doi.org/10.4271/2010-01-1125.
- Ciajolo A D'Anna A Barbella R et al. The effect of temperature on soot inception in premixed ethylene flames Symposium Combustion 1996 26 2 2327 2333
- Akihama, K. Takatori, Y. Inagaki, K. Sasaki, S. et al. “Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature,” SAE Technical Paper 2001-01-0655 2001
- Alriksson, M. Denbratt, I. “Low Temperature Combustion in a Heavy Duty Diesel Engine using High Levels of EGR,” SAE Technical Paper 2006-01-0075 2006
- Kumar, R. Zheng, M. “Fuel Efficiency Improvements of Low Temperature Combustion Diesel Engines,” SAE Technical 2008-01-0841 2008
- Li, T. Suzuki, M. Ogawa, H. “Characteristics of Smokeless Low Temperature Diesel Combustion in Various Fuel-Air Mixing and Expansion of Operating Load Range,” SAE Technical Paper 2009-01-1449 2009
- Han, S. Shim, E. Jang, J. Park, J. et al. “Operating Range of Low Temperature Diesel Combustion with Supercharging,” SAE Technical Paper 2009-01-1440 2009
- Keeler, B. Shayler, P.J. “Constraints on Fuel Injection and EGR Strategies for Diesel PCCI-Type Combustion,” SAE Technical Paper 2008-01-1327 2008
- Alriksson, M. Rente, T. Denbratt, I. “Low Soot, Low NOx in a Heavy Duty Diesel Engine Using High Levels of EGR,” SAE Technical Paper 2005-01-3836 2005
- Henein, N.A. Bhattacharyya, A. Schipper, J. Kastury, A. et al. “Effect of Injection Pressure and Swirl Motion on Diesel Engine-Out Emissions in Conventional and Advanced Combustion Regimes,” SAE Technical Paper 2006-01-0076 2006
- Henein, N.A. Kastury, A. Natti, K. Bryzik, W. “Advanced Low Temperature Combustion (ALTC): Diesel Engine Performance, Fuel Economy and Emissions,” SAE Technical Paper 2008-01-0652 2008
- Helmantel, A. “Reduction of NOx Emissions from a Light Duty DI Diesel Engine in Medium Load Conditions with High EGR Rates,” SAE Technical Paper 2008-01-0643 2008
- Shin, B. Heo, H. Lee, H. Chi, Y. “Technologies for Improved Emission Potential in a Small Displacement Volume Passenger Diesel Engine,” SAE Technical Paper 2009-01-1444 2009
- Wakisaka, Y. Hotta, Y. Inayoshi, M. Nakakita, K. et al. “Emissions Reduction Potential of Extremely High Boost and High EGR Rate for an HSDI Diesel Engine and the Reduction Mechanisms of Exhaust Emissions,” SAE Int. J. Fuels Lubr. 1 1 611 623 2008
- Adachi, T. Aoyagi, Y. Kobayashi, M. Murayama, T. et al. “Effective NOx Reduction in High Boost, Wide Range and High EGR Rate in a Heavy Duty Diesel Engine,” SAE Technical Paper 2009-01-1438 2009
- Benajes, J. Molina, S. Novella, R. Arthozoul, S. et al. “Advanced Injection Strategies to Attain Partially Premixed Combustion Process in a Heavy Duty Diesel Engine,” SAE Technical Paper 2008-01-0642 2008
- Hountalas, D.T. Lamaris, V.T. Pariotis, E.G. Ofner, H. “Parametric Study Based on a Phenomenological Model to Investigate the Effect of Post Fuel Injection on HDDI Diesel Engine Performance and Emissions - Model Validation using Experimental Data,” SAE Technical Paper 2008-01-0641 2008
- Vanegas, A. Won, H. Felsch, C. Gauding, M. et al. “Experimental Investigation of the Effect of Multiple Injections on Pollutant Formation in a Common-Rail DI Diesel Engine,” SAE Technical Paper 2008-01-1191 2008
- Cursente, V. Pacaud, P. Gatellier, B. “Reduction of the Compression Ratio on a HSDI Diesel Engine: Combustion Design Evolution for Compliance the Future Emission Standards,” SAE Int. J. Fuels Lubr. 1 1 420 439 2008
- Beatrice, C. Del Giacomo, N. Guido, C. “Benefits and Drawbacks of Compression Ratio Reduction in PCCI Combustion Application in an Advanced LD Diesel Engine,” SAE Int. J. Engines 2 1 1290 1303 2009
- Murata, Y. Kusaka, J. Daisho, Y. Kawano, D. et al. “Miller-PCCI Combustion in an HSDI Diesel Engine with VVT,” SAE Int. J. Engines 1 1 444 456 2008
- Shutty, J. “Control Strategy Optimization for Hybrid EGR Engines,” SAE Technical Paper 2009-01-1451 2009
- Boot, M.D. Frijters, P.J.M. Klein-Douwel, R.J.H. Baert, R.S.G. “Oxygenated Fuel Composition Impact on Heavy-Duty Diesel Engine Emissions,” SAE Technical Paper 2007-01-2018 2007