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Modeling of Liquid Fuel Behavior to Control Air/Fuel Ratio in the Intake Port of SI Engines
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 Title & Authors
Modeling of Liquid Fuel Behavior to Control Air/Fuel Ratio in the Intake Port of SI Engines
Cho, Hoon; Min, Kyoung-Doug; Hwang, Seung-Hwan; Lee, Jong-Hwa;
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A wall fuel-film flow model is developed to predict the effect of a wall-fuel-film on air-fuel ratio in an SI engine in transient conditions. Fuel redistribution in the intake port resulting from charge backflow and a simple liquid fuel behavior in the cylinder are included in this model. Liquid fuel film flow is calculated of every crank angle degree using the instantaneous air flow rate. The model is validated by comparing the calculated results and corresponding engine experiment results of a commercial 4 cylinder DOHC engine. The predicted results match well with the experimental results. To maintain the constant air-fuel ratio during transient operation. the fuel injection rate control can be obtained from the simulation result.
Wall-Fuel-Film;Air-Fuel Ratio;Intake Port;Backflow;Model;Liquid Fuel Film;Cold Start;
 Cited by
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Chen, K., 1994, 'Fuel Volatility Modeling, M.S. Thesis,' MIT

Shin, Y., 1996, 'Liquid Fuel Behavior in the Mixture Preparation Process During Starting and Warm-Up in a Spark Ignition Engine,' PhD. Thesis. MIT

Bauer, W., Balum, P. and Heywood, J., 1997, 'Heat Transfer and Mixture Vaporization in Intake Port of Spark-Ignition Engine,'SAE paper 972983

Hentschel, M., Grote, A. and Langer, O., 1997, 'Measurment of Wall Film Thickness in the Intake Manifold of a Standard Production SI Engine by a Spectroscopic Technique,' SAE paper 972832

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