An Analytic Model for Cylinder Pressure in a Four Stroke SI Engine
Date Published: 2002-03-04
Paper Number:2002-01-0371
DOI: 10.4271/2002-01-0371
Citation:
Eriksson, L. and Andersson, I., "An Analytic Model for Cylinder Pressure in a Four Stroke SI Engine," SAE Technical Paper 2002-01-0371, 2002, doi:10.4271/2002-01-0371.
An analytic model for cylinder pressures in spark ignited engines is developed and validated. The main result is a model expressed in closed form that describe the in-cylinder pressure development of an SI engine. The method is based on a parameterization of the ideal Otto cycle and takes variations in spark advance and air-to-fuel ratio into account. The model consists of a set of tuning parameters that all have a physical meaning. Experimental validation on two engines show that it is possible to describe the in-cylinder pressure of a spark ignited combustion engine operating close to stoichiometric conditions, as a function of crank angle, manifold pressure, manifold temperature and spark timing.
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