A Simple Model for Cyclic Variations in a Spark-Ignition Engine

Paper #:
  • 962086

Published:
  • 1996-10-01
Citation:
Daw, C., Finney, C., Green, J., Kennel, M. et al., "A Simple Model for Cyclic Variations in a Spark-Ignition Engine," SAE Technical Paper 962086, 1996, https://doi.org/10.4271/962086.
Pages:
12
Abstract:
We propose a simple, physically oriented 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 volume-average 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 of cyclic variation patterns. Additional mechanisms for stochastic and prior-cycle effects can be added to evaluate their impact on overall engine performance. We find good agreement with our experimental data.
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