This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Modes and Measures of Cyclic Combustion Variability
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1983 by SAE International in United States
Annotation ability available
A single-cylinder engine with a transparent piston crown was tested with three intake geometries which produced different levels of swirl, and with two spark locations. A heat-release analysis was performed on the accumulated pressure-time data. Using this data base, relationships of maximum cycle pressure and its location in the cycle to the placement of the burn in the cycle are developed for different burning rates as a means of diagnosing sources of combustion variability.
Among the significant observations were that combustion variability for operation away from the lean limit or incipient misfire is not strongly dependent on flow conditions at the spark plug and early flame behavior, but more dependent on the cyclic repeatability of the overall cylinder flow pattern. In the region of incipient misfire the early flame process becomes a significant source for variability. The onset of significant variability in IMEP corresponds to a condition where a collection of cycles shows the production of an increasing number of abnormally late burns as the spark is advanced. Additional spark advance results in the occurrence of misfire at approximately the frequency of the late-burn occurrence.
CitationMatekunas, F., "Modes and Measures of Cyclic Combustion Variability," SAE Technical Paper 830337, 1983, https://doi.org/10.4271/830337.
- Young M. B. “Cyclic Dispersion in the Homogeneous-Charge Spark-Ignition Engine - A Literature Survey,” SAE Paper No. 810020 1981
- Young M. B. Lienesch J. H. “An Engine Diagnostic Package (EDPAC) - Software for Analyzing Cylinder Pressure-Time Data,” SAE Paper 780967 1978
- Barton R. K. Kenemutn D. K. Lestz S. S. Meyer W. E “Cycle-by-Cycle Variations of a Spark Ignition Engine - A Statisitical Analysis,” SAE Paper No. 700488 1970
- Patterson D, J. “Pressure Variations, A Fundamental Combustion Problem,” SAE Transactions 75 1967 621
- Kuroda H. Nakajima Y. Sugihara K. Takagi Y. Muranaka S. “The Fast Burn with Heavy EGR, New Approach for Low NOx and improved Fuel Economy,” SAE Transactions 87 1978 1
- Tuttle J. H. Toepel R. R “Increased Burning Rates Offer Improved Fuel Economy-NOx Emissions Trade-Offs in Spark-Ignition Engines,” SAE Transactions 88 1979 1440
- Swords M. D. Kalghatgi G. T. Watts A. J. “An Experimental Study of Ignition and Flame Development in a Spark Ignited Engine,” SAE Paper No. 821220 1982
- Quader A. A. “What Limits Lean Operation in Spark Ignition Engines - Flame Initiation or Propagation?” SAE Transactions 85 1976 2374
- Johnston R. W. Neuman J. G. Agarwal P. D. “Programmable High Energy Ignition System for Engine Optimizaton,” SAE Paper 750348 1975
- El Tahry S. H. “A Numerical Study on the Effects of Fluid Motion at Inlet-Valve Closure on Subsequent Fluid Motion in a Motored Engine,” SAE Paper No. 820035 1982
- Arcoumanis C. Bicon A. F. Whitelaw J. H. “Effect of Inlet Parameters on the Flow Characteristics in a Four-Stroke Model Engine,” SAE Paper No. 820750 1982
- Morse A. D. Whitelaw J. H. Yianneskio M. “The Influence of Swirl on the Flow Characteristics of a Reciprocating Piston-Cylinder Assembly,” J. Fluids Engng. 102 1980 478
- Lancaster D. R. Krieger R. B. Sorenson S. C. Hull W. C. “Effects of Turbulence on Spark-Ignition Engine Combustion,” SAE Transactions 85 1976 2374
- Groff E. G. Matekunas F. A. “The Nature of Turbulent Flame Propagation in a Homogeneous Spark-Ignited Engine,” SAE Transactions 89 1980 740
- Groff E. G. Sinnamon J. H. “The Effects of Ignition Location in a Swirl Field on Homogeneous Charge Combustion,” SAE Paper No. 821221 1982
- Matekunas F. A. “Ignition Studies in a Rapid Compression Machine,” Paper presented at Central States Meeting, Combustion Institute 1978
- Witze P. O. “The Effect of Spark Location on Combustion in a Variable Swirl Engine,” SAE Paper No. 820044 1982