Title: Identification of one-zone heat release parameters for SI engine

Authors: Samir Saraswati, Satish Chand

Addresses: Mechanical Engineering Department, MNNIT, Allahabad, India. ' Mechanical Engineering Department, MNNIT, Allahabad, India

Abstract: 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.

Keywords: one-zone heat release analysis; parameter identification; Levenberg-Marquardt optimisation; reduced order method; spark ignition engines; simulation.

DOI: 10.1504/IJMIC.2009.024736

International Journal of Modelling, Identification and Control, 2009 Vol.6 No.4, pp.287 - 300

Published online: 29 Apr 2009 *

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