A Study of the Characteristics of Fuel-Film Dynamics for Four-Stroke Small-Scale Spark-Ignition Engines
Date Published: 2009-04-20
Paper Number:2009-01-0591
DOI: 10.4271/2009-01-0591
Citation:
Wu, Y., Chen, B., Hsieh, F., and Ke, C., "A Study of the Characteristics of Fuel-Film Dynamics for Four-Stroke Small-Scale Spark-Ignition Engines," SAE Technical Paper 2009-01-0591, 2009, doi:10.4271/2009-01-0591.
The phenomenon of fuel-film dynamics for four-stroke small-scale spark-ignition engines is investigated in this paper. A first-order fuel-film model, so-called tau-x model, is used to represent the fuel dynamics. The parameters of fuel-film model, which consists of the portion of fuel that deposited on the manifold wall and the time constant of the fuel evaporation process, are identified using the recursive least squared technique. Performances of the proposed algorithm are evaluated using a nonlinear engine model in Matlab/Simulink. The preliminary simulation results show that the proposed algorithm can accurately be used to identify the parameters of fuel-film model. The experimental data are then utilized to study the characteristics of fuel-film dynamics, and show that the fuel-film dynamics is significantly affected by engine speed, throttle opening, injection timing, and intake temperature.
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