This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Prior-Cycle Effects in Lean Spark Ignition Combustion - Fuel/Air Charge Considerations
Annotation ability available
Sector:
Language:
English
Abstract
The goal of this investigation was to gain a better understanding of the effect of fuel/air charge composition on the dynamical structure of cyclic dispersion in lean-fueled spark ignition engines. Swirl and fuel injection timing were varied on a single-cylinder research engine to investigate the effects of charge motion and stratification on prior-cycle effects under lean operating conditions. Temporal patterns in the cycle-to-cycle combustion dynamics were analyzed using return maps, Shannon entropy, and symbol sequence statistics. Our results indicated a transition from stochastic behavior to noisy nonlinear determinism as equivalence ratio was decreased from near stoichiometric to very lean conditions. The equivalence ratio at which deterministic effects became important was strongly influenced by swirl and fuel injection timing. A comparison of our results and previous results from an eight-cylinder production engine showed similar trends. These trends were also consistent with a previously suggested simple model for cyclic variation. The observation of determinism under lean conditions may have important diagnostics and control implications since cyclic dispersion is not a purely random process.
Authors
Citation
Wagner, R., Drallmeier, J., and Daw, C., "Prior-Cycle Effects in Lean Spark Ignition Combustion - Fuel/Air Charge Considerations," SAE Technical Paper 981047, 1998, https://doi.org/10.4271/981047.Also In
References
- Ozdor, N. Dulger, M. Sher, E. “Cyclic Variability in Spark Ignition Engines: A Literature Survey,” SAE Paper No. 940987 1994
- Young, M.B. “Cyclic Dispersion in the Homogeneous Charge Spark-Ignition Engine - A Literature Survey,” SAE Paper No. 810020 1981
- Daw, C.S. Finney, C.E.A. Green, J.B. Kennel, M.B. Thomas, J.F. “A Simple Model for Cyclic Variations in a Spark Ignition Engine,” SAE Paper No. 962086 1996
- Martin, J.K. Plee, S.L. Remboski, D.J. “Burn Modes and Prior-Cycle Effects on Cyclic Variations in Lean-Burn Spark-Ignition Combustion,” SAE Paper No. 880201 1988
- Ishii, K. Sasaki, T. Urata, Y. Yoshida, K. Ohno, T. “Investigation of Cyclic Variation of IMEP Under Lean Burn Operation in Spark-Ignition Engine,” SAE Paper No. 972830 1997
- Wagner, R.M. The Impact of Fuel Spray Behavior on Combustion Stability in a Spark Ignition Engine MS Thesis University of Missouri-Rolla 1995
- Holthaus, B.E. Wagner, R.M. Drallmeier, J.A. “Measurements of Intake Port Fuel/Air Mixture Preparation,” SAE Paper No. 970867 1997
- Heywood, J.B. Internal Combustion Engine Fundamentals McGraw Hill 0-07-028637-X 1988
- Wagner, R.M. Nemecek, L.M. Drallmeier, J.A. “Fuel Delivery in a Port Fuel Injected Spark Ignition Engine,” Atomization and Sprays 1997
- Moon, F.C. Chaotic and Fractal Dynamics John Wiley and Sons 0-471-54571-6 1992
- Crutchfield, J.P. Packard, N.H. “Symbolic Dynamics of Noisy Chaos,” Physica 7D 201 223 1983
- Tang, X.Z. Tracy, E.R. Boozer, A.D. deBrauw, A. Brown, R. “Symbol Sequence Statistics in Noisy Chaotic Signal Reconstruction,” Physical Review E 3871 3889 1995
- Finney, C.E.A. Green, J.B. Daw, C.S. “Nonlinear Time-Series Analysis and Symbol-Sequence Statistics for Characterization of Dynamic Engine Measurements,” 1998
- Abarbanel, H.P.I. Analysis of Observed Chaotic Data Springer New York 1996
- Quader, A.A. “The Axially-Stratified-Charge Engine,” SAE Paper No. 820131 1982