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Lean Air-Fuel Ignition System Comparison in a Fast-Burn Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1985 by SAE International in United States
Annotation ability available
Ignition experiments were performed with a fast burn, single cylinder engine with the objective of comparing lean air-fuel ignitability characteristics. Ignition system variables investigated were: plug type, ignition energy, ignition power input, firing duration, and a plasma jet ignitor.
Lean air-fuel Ignition limits were determined for four different ignition system combinations. The ignition limit at a given A/F condition was determined by first setting the engine at its subjective MBT condition at a constant speed, load, and A/F ratio and then advancing the spark angle until misfire occurred. The misfire limit was analyzed via the location of the angle of peak cylinder pressure over 1800 engine cycles. Misfires were assumed to occur for all peak cylinder pressure angles less than or equal to top dead center of compression.
The spark angle sensitivities of the various ignition systems were further compared at a constant A/F ratio of 24:1 at constant flow rates for MBT operation at 1500 RPM, 58 pai IMEP. Variables investigated were specific fuel consumption and emissions, 0-10 % and 10-90% burn times, and coefficient of variation of the peak cylinder pressure.
The ignition limit of the long duration ignition system (40-60 crankangle degrees) used with a surface-air gap plug was found to have the greatest spark angle tolerance. The plasma jet ignition system had the leanest projected lean misfire limit. Adding capacitance to a conventional plug to enhance the initial discharge was found to increase the initial rate of burning, but had little effect on the ignition limit.
The rapid energy discharge system had the fastest 0-10 % burn time with the most retarded MBT+1 % ISFC spark advance angle. It also had the best combustion stability and lowest ISNO at its MBT+1 % condition. All the high energy ignition systems had comparable ISFC values. The air-fuel ratio at which the minimum IFSC occurred, however, was observed to shift to a leaner operating condition as the burn rate of the mixture was enhanced by the ignition system.
CitationAnderson, R. and Asik, J., "Lean Air-Fuel Ignition System Comparison in a Fast-Burn Engine," SAE Technical Paper 850076, 1985, https://doi.org/10.4271/850076.
- Quader, A. A. “Lean Combustion and the Misfire Limit in Spark Ignition Engines” SAE Paper 741055 February 1974
- Quader, A. A. “What Limits Lean Operation in Spark Ignition Engines Flame Initiation or Propagation?” SAE Paper 760760 October 1976
- Peters, B. D. Quader, A. A. ““Wetting” the Appetite of Spark Ignition Engines for Lean Combustion” SAE Paper 780234 February 1978
- Shiomoto, G. H. Sawyer, R. F. Kelly, B. P. “Characterization of the Lean Misfire Limit” SAE Paper 780235 February 1978
- Douaud, A. De Soete, G. G. Henault, C “Experimental Analysis of the Initiation and Development of Part Load Combustions in Spark - Ignition Engines” SAE Paper 830338 February 1983
- Arici, O. Tabaczynski, R. J. Arpaci, V. S. “A Model for the Lean Misfire Limit in Spark - Ignition Engines” Combust. Sei. Technol. 33 1982 333
- Germane, G. J. Wood, C. G. Hess, C. C “Lean Combustion in Spark -Ignited Internal Combustion Engines - A Review” SAE Paper 831217 August 1983
- Swett, C. C. Jr. “Spark Ignition of Flowing Gases” NACA Report 1287 1956
- De Soete, G. G. “The Influence of Isotropic Turbulence on the Critical Ignition Energy” Thieteenth Symp. (Int.) Combust. Combust. Inst. 1970 735
- Ballal, D. R. Lefebvre, A. H. “Ignition and Flame Quenching in Flowing Gaseous Mixtures Proc. R. Soc. London 357 1977 163
- Akindele, O. O. Bradley, D. Mak, P. W. McMahon, M. “Spark Ignition of Turbulent Gases” Combust. Flame 47 1982 129
- Nakamura, N. Champion Ignition and Engine Performance Conference 1981 160
- Schwarz, H. “Ignition Systems for Lean Burn Engines” Fuel Economy and Emissions of Lean Burn Engines, Inst. Mech. Eng. Conf. Pub. 1979-9 London June 1979
- Anderson, R. W. Asik, J. R. “Ignitability Experiments in a Fast Burn, Lean Burn, Engine” SAE Paper 830477 February 1983
- Nohira, H. Yamada, N. Iwashita, Y. Hattori, T. “A Study of Ignitability using a Single Compression Machine” Spring Tech. Meet. Cent. States Sect., Combust. Inst. 1981
- Nakamura, N. Kobayashi, T. Hanaoka, M. Takagi, N. “A New Platinum Tipped Spark Plug Extends the Lean Misfire Limit” SAE Paper 830479 February 1983
- Durbin, E. J. Tsai, K. C “Extending the Lean Limit Operation of an SI Engine with a Multiple Electrode Spark Plug” SAE Paper 830476 1983
- Maly, R. R. Vogel, M. “Initiation and Propagation of Flame Fronts in Lean CH4 - Air Mixtures by Three Modes of the Ignition Spark” Seventeenth Symp. (Int.) Combust. Combust. Inst. 1978 821
- Maly, R. R. Saggau, B. Wagner, E. Ziegler, G. “Prospects of Ignition Enhancement” SAE Paper 830478 February 1983
- Maly, R. R. Ziegler, G. F. W. Wagner, E. P. “Effect of Ignition System Design on Flammability Requirements in Ultra - Lean Turbulent Mixtures” Combustion in Engineering, Inst. Mech. Eng. C47/83 1983 81
- Ziegler, G.F.W. Wagner, E.P. Saggau, B. Maly, R.R. Herden, W. “Influence of a Breakdown Ignition System on Performance and Emission Characteristics” SAE Paper 840992 August 1984
- Asik, J. R. Piatkowski, P. Foucher, M. J. Rado, W. G. “Design of a Plasma Jet Ignition System for Automotive Application” SAE Paper 770355 1977
- Edwards, C. F. Oppenheim, A. K. Dale, J. D. “A Comparative Study of Plasma Jet Ignition Systems” SAE Paper 830479 February 1983
- Wyozalek, F. A. Frank, D. L. Neuman, J. G. “Plasma Jet Ignition of Lean Mixtures” SAE Paper 750349 1979
- Davis, G. L. Kent, J. C “Comparison of Model Calculations and Experimental Measurements of the Bulk Cylinder Flow Processes in a Motored PRCO Engine” SAE Paper 790290 March 1979
- Lilley, R. D. Asik, J. F. “Supplementary Spark Energy (SSE) System” Ford Res. Tech. Rep. SR-81-85 July 15 1981
- Grant, J.F. Marram, E.P. Mcllwain, M.E. “Optimization of Plasma Jet Ignition Properties: Ignition of Lean - Quiescent Mixtures of Propane” Combust. Sci. Tech. 11 1982 222
- Hattori, T. Goto, K. Ohigashi, S. “Study of Spark Ignition in Flowing Lean Mixtures” Fuel Economy and Emissions of Lean Burn Engines, Inst. Mech. Eng. Conf. Pub. 1979-9 London June 1979