Identification of one-zone heat release parameters for SI engine

Heat release analysis is used for predicting the gross heat release characteristic from the pressure data inside the cylinder. In present work, simulation of one-zone heat release model, which involves large number of physically important parameters, is done in Matlab/Simulink environment. The objective here is to find out that how many of these parameters can be reliably determined using in-cylinder pressure measurements. Levenberg-Marquardt optimisation method is used to minimise a least-square objective function for determining the parameters. The smaller value of the objective function is not enough to validate the quality of parameters estimated; hence, their reliability is determined by studying the logarithmic P-V diagram. A methodology is also proposed to find out the parameters, which cannot be identified reliably. The present approach helps in identifying one-zone heat release parameters systematically and prevents the use of arbitrary values of parameters.

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