A simple model for cyclic variations in a spark-ignition engine

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Description

We propose a simple model that explains important characteristics of cyclic combustion variations in spark-ignited engines. A key model feature is the interaction between stochastic, small-scale fluctuations in engine parameters and nonlinear deterministic coupling between successive engine cycles. Prior-cycle effects are produced by residual cylinder gas which alters mean in-cylinder equivalence ratio and subsequent combustion efficiency. The model`s simplicity allows rapid simulation of thousands of engine cycles, permitting in-depth statistical studies. Additional mechanisms for stochastic and prior-cycle effects can be added to evaluate their impact on overall engine performance. We find good agreement with experimental data.

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7 p.

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Daw, C.S.; Green, J.B. Jr.; Kennel, M.B.; Thomas, J.F.; Finney, C.E.A. & Connolly, F.T. May 1, 1996.

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Description

We propose a simple model that explains important characteristics of cyclic combustion variations in spark-ignited engines. A key model feature is the interaction between stochastic, small-scale fluctuations in engine parameters and nonlinear deterministic coupling between successive engine cycles. Prior-cycle effects are produced by residual cylinder gas which alters mean in-cylinder equivalence ratio and subsequent combustion efficiency. The model`s simplicity allows rapid simulation of thousands of engine cycles, permitting in-depth statistical studies. Additional mechanisms for stochastic and prior-cycle effects can be added to evaluate their impact on overall engine performance. We find good agreement with experimental data.

Physical Description

7 p.

Notes

OSTI as DE96009409

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  • 1996 Central States Section technical meeting of the Combustion Institute, St. Louis, MO (United States), 5-7 May 1996

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  • Other: DE96009409
  • Report No.: CONF-9605160--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 220572
  • Archival Resource Key: ark:/67531/metadc667539

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  • May 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Jan. 21, 2016, 12:14 p.m.

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Daw, C.S.; Green, J.B. Jr.; Kennel, M.B.; Thomas, J.F.; Finney, C.E.A. & Connolly, F.T. A simple model for cyclic variations in a spark-ignition engine, article, May 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc667539/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.