Spark ignition internal combustion engine modelling using Matlab

Abstract

A number of Matlab routines for combustion calculations and thermodynamic simulation of spark ignition internal combustion engine operation are described. Functions that return the thermodynamic curve coefficients for a variety of fuel, air, and combustion product species are described. A Matlab version of the Olikara and Borman method for determining the equilibrium state of combustion products is also presented. Additional routines specifically designed for spark ignition engine modelling are also described. Most of the routines included in this report are essentially Matlab versions of the FORTRAN programs presented by Ferguson for spark ignition engine calculations. Comparisons of results from the new Matlab routines and previous routines and data indicate that the new Matlab routines are reliable -- typical deviations from previous results are less than 1%.