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Air-Fuel Ratio Dependence of Random and Deterministic Cyclic Variability in a Spark-Ignited Engine
Technical Paper
1999-01-3513
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
One important design goal for spark-ignited engines is to minimize cyclic variability. A small amount of cyclic variability (slow burns) can produce undesirable engine vibrations. A larger amount of cyclic variability (incomplete burns) leads to increased hydrocarbon consumption/emissions. Recent studies have reported deterministic patterns in cyclic variability under extremely lean (misfiring) operating conditions. The present work is directed toward more realistic non-misfiring conditions. Production engine test results suggest that deterministic patterns in cyclic variability are the consequence of incomplete combustion, hence control algorithms based on the occurrence of these patterns are not expected to be of significant practical value.
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Scholl, D. and Russ, S., "Air-Fuel Ratio Dependence of Random and Deterministic Cyclic Variability in a Spark-Ignited Engine," SAE Technical Paper 1999-01-3513, 1999, https://doi.org/10.4271/1999-01-3513.Also In
References
- Daw C.S. Finney C.E.A. Green J.B. Jr. Kennel M.B. Thomas J.F. Connolly F.T. “A Simple Model for Cyclic Variations in a Spark-Ignition Engine” SAE 962086
- Finney C.E.A. Green J.B. Jr. Daw C.S. “Symbolic Time-Series Analysis of Engine Combustion Measurements” SAE 980624
- Wagner R.M. Drallmeier J.A. Daw C.S. “Prior-Cycle Effects in Lean Spark Ignition Combustion - Fuel/Air Charge Considerations” SAE 981047
- Green J.B. Jr. Daw C.S. Armfield J.S. Finney C.E.S. Wagner R.M. Drallmeier J.A. Kennel M.B. Durbetaki P. “Time Irreversibility and Comparison of Cyclic-Variability Models” SAE 1999-01-0221
- Quader A.A. Majkowski R.F. “Cycle-by-Cycle Mixture Strength and Residual-Gas Measurements During Cold Starting” SAE 1999-01-1107
- Rassweiler G.M. Withrow L. “Motion Pictures of Engine Flames Correlated with Pressure Cards” SAE 800131
- Oppenheim A.V. Schafer R.W. Discrete-Time Signal Processing Prentice Hall New Jersey 1989
- Hoard J. Rehagen L. “Relating Subjective Idle Quality to Engine Combustion” SAE 970035