A simple model for cyclic variations in a spark-ignition engine
- Oak Ridge National Lab., TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
- Ford Motor Co., Dearborn,, MI (United States)
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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 220572
- Report Number(s):
- CONF-9605160-1; ON: DE96009409
- Resource Relation:
- Conference: 1996 Central States Section technical meeting of the Combustion Institute, St. Louis, MO (United States), 5-7 May 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
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