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Partially Pre-Mixed Auto-Ignition of Gasoline to Attain Low Smoke and Low NOx at High Load in a Compression Ignition Engine and Comparison with a Diesel Fuel
Technical Paper
2007-01-0006
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A Swedish MK1 diesel fuel and a European gasoline of ∼95 RON have been compared in a single cylinder CI engine operating at 1200 RPM with an intake pressure of 2 bar abs., intake temperature of 40°C and 25% stoichiometric EGR at different fuelling rates and using different injection strategies. For the same operating conditions, gasoline always gives much lower smoke compared to the diesel fuel because of its higher ignition delay; this usually allows the heat release to be separate in time from the injection event. NOx can be controlled by EGR. With dual injection, for diesel fuel, there can be significant heat release during the compression stroke because of the pilot injection earlier in the compression stroke. For a fixed total fuelling rate, compared to single injection, this reduces fuel efficiency and increases the lowest achievable level of smoke. With gasoline, pilot injection helps reduce the maximum heat release rate for a given IMEP and enables heat release to occur later with low cyclic variation compared to single injection. This enables higher mean IMEP to be reached with lower smoke, NOx and maximum heat release rate compared to single injection. One of the operating points reached with gasoline with double injection had mean IMEP of 15.95 bar (stdev. 0.112 bar), AVL smoke opacity of 0.33% (FSN < 0.07), ISNOx of 0.58 g/kWh, ISFC of 179 g/kWh, ISHC of 2.9 g/kWh, ISCO of 6.8 g/kWh and peak pressure of ∼ 120 bar. At the same operating conditions, to get such low level of smoke with Swedish MK1 diesel fuel, IMEP has to be below 6.5 bar. There is scope for further improvements by increasing intake pressure and the EGR level and through optimisation of the injection and mixture preparation strategy e.g. more injection pulses and injector design e.g. more holes.
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Citation
Kalghatgi, G., Risberg, P., and Ångström, H., "Partially Pre-Mixed Auto-Ignition of Gasoline to Attain Low Smoke and Low NOx at High Load in a Compression Ignition Engine and Comparison with a Diesel Fuel," SAE Technical Paper 2007-01-0006, 2007, https://doi.org/10.4271/2007-01-0006.Also In
References
- Kalghatgi, G.T. “Auto-ignition quality of practical fuels and implications for fuel requirements of future SI and HCCI engines” SAE 2005-01-0239 2005
- Dec, J.E. “A conceptual model of DI diesel combustion based on laser sheet imaging” SAE 970873 1997
- Heywood, J.B. “Internal combustion engine fundamentals” McGraw Hill Book Co. 1988
- Westbrook, C.K. “Chemical kinetics of hydrocarbon ignition in practical combustion 12 systems” Proceedings of the Combustion Institute 28 1563 1577 2000
- Yanagihara, H. Sato, Y. Mizuta, J. “A simultaneous reduction in Nox and soot in diesel engines under a new combustion system (Uniform Bulky Combustion System-UNIBUS)” 17 th International Vienna Motor Symposium 303 314 1996
- Kitano, K. Nishiumi, R. Tsukasaki, Y. Tanaka, T. Morinaga, M. “Effects of fuel properties on pre-mixed charge compression ignition combustion in a direct injection diesel engine” JSAE 20030117 and SAE 2003-01-1815 2003
- Kimura, S. Osama, A. Ogama, H. Muranaka, S. “New combustion concept for ultra-clean and high-efficiency small DI diesel engines” SAE 1999-01-3681
- Kimura, S. Osamu, A. Kitahara, Y. Aiyoshizawa, E. “Ultra-clean combustion technology combining a low temperature and premixed combustion concept for meeting future emission standards” SAE 2001-01-0200
- Kimura, S. Ogawa, H. Matsui, Y. Enomoto, Y. “An experimental analysis of of lowtemperature and premixed combustion for simultaneous reduction of of NOx and particulate emissions in direct injection diesel engines” Int. J. Engine res. 3 4 249 259 2002
- Hashizume, T. Miyamoto, T. Akagawa, H. Tsujimura, K. “Combustion and emission characteristics of multiple stage diesel combustion” SAE 980505 1998
- Su, W. Lin, T. Pei, Y. “A compound technology for HCCI combustion in a DI diesel engine based on multi-pulse injection and the BUMP combustion chamber” SAE 2003-01-741 2003
- Mueller, C.J. Martin, G.C. Briggs, T.E. Duffy, K.P. “An experimental investigation of incylinder processes under dual-injection conditions in a DI diesel engine” SAE 2004-01-1843 2004
- Dronniou, N. Lejeune, M Balloul, I. Higelin, P. “Combination of high EGR rates and multiple injection strategies to reduce pollutant emissions” SAE 2005-01-3726 2005
- Risberg, P. Kalghatgi, G. Ångström H-E “Auto-ignition quality of diesel-like fuels in HCCI engines” SAE 2005-01-2127 2005
- Kalghatgi, G. Risberg, P. Ångström H-E “Advantages of fuels with high resistance to auto-ignition in late-injection, low-temperature, compression ignition combustion” SAE 2006-01-3385 2006
- Shimazaki, N. Tsurushima, T. Nishimura, T. “Dual mode combustion concept with premixed diesel combustion by direct injection near top dead center” SAE 2003-01-0742 2003
- Kalghatgi, G.T. Head, R.A. “Combustion limits and efficiency in a HCCI engine” Int. J. Engine Res. 7 3 215 236 2006
- Schindler W. Nöst M. Thaller W. Luxbacher T. “Stationäre und Transiente Messtechnische - Erfassung Niedriger Rauchwerte” MTZ 10 2001
- Kalghatgi, G.T. “Fuel effects in gasoline HCCI engines” “Homogeneous charge compression ignition (HCCI) and controlled auto ignition (CAI) engines for the automotive industry” Zhao, H. Woodhead Publishing Ltd.
- Sakai, A. Takeyama, H. Ogawa, H. Miyamoto, N. “Improvements in premixed charge compression ignition combustion and emissions with lower distillation temperature fuels” Int. J. Engine res. 6 433 442 2005
- Mueller, C.J. Piz, W.J. Pickett, L.M. Martin, G.C. Siebers, D.L. Westbrook, C.K. “Effects of oxygenates on soot processes in DI diesel engines: Experiments and numerical simulations” JSAE 20030193, SAE 2003-01-1791
- Aroonsrisopn, T. Werner, P. Waldman, J.O. Sohm, V. Foster, D.E. Morikawa, T. Iida, M. “Expanding the HCCI operation with the charge stratification” SAE 2004-01-1756
- Sjoberg, M. Dec, J. “Smoothing HCCI heat-release rates using partial fuel stratification with two-stage ignition fuels” SAE 2006-01-0629
- Yun, H. Reitz, R.D. “Combustion optimization in the low-temperature diesel combustion engine” Int. J. Engine Res. 6 513 524 2005
- Agrell, F. Ångström H-E Eriksson, B. Wikander, J. Linderyd, J. “Transient control of HCCI through combined intake and exhaust valve actuation” SAE 2003-01-3172
- Mueller, C.J. Piz, W.J. Pickett, L.M. Martin, G.C. Siebers, D.L. Westbrook, C.K. “Effects of oxygenates on soot processes in DI diesel engines: Experiments and numerical simulations” JSAE 20030193, SAE 2003-01-1791
- Carlucci, P. Ficarella, A. Laforgia, D. “Effects on combustion and emissions of early and pilot fuel injections in diesel engines” Int. J. Engine Res. 6 1 43 60 2005