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The mathematical modeling and simulation of an SI engine combustion cycle has contributed for its development, leading to the improvement of the engine purpose to convert the chemical energy of a fuel into mechanical energy through the movement of a piston. The simulation of this models allows the efficiency evaluation of the fuel combustion by generating performance parameters. The Matlab® software, a high-level language and interactive environment, were used for the creation of an add-on based on graphical user interface (GUI), capable of simulating the combustion cycle of a SI engine fuelled by wet ethanol with user-supplied initial parameters.

Zero-dimensional zonal models are seen as interesting tools for engine simulation due to their simplicity and yet accuracy in fitting or predicting experimental data. For combustion, a common model is a dual zone model, in which two-zones, spatially homogeneous, are set during the combustion process. Such model take into account an interface of infinitesimal thickness for the separation between zones. The success of this simulation approach depends on the accuracy of the heat transfer model. These models aim to obtain the heat transfer coefficient from the combustion gases in contact with the cylinder walls. Several heat transfer correlations from the literature can be used to obtain the heat transfer coefficient.