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Abstract

Physical models of NO_x formation are becoming more and more interesting in the area of combustion feedback control. The fact that cylinder pressure sensors are made available on the market enables fast and accurate calculations of heat release, which is an essential part of every physical NO_x formation model. This article describes such a zero-dimensional model for a diesel engine using crank angle–resolved cylinder pressure to determine heat release. The model also incorporates the thermal effect of exhaust gas recirculation that is proven to have a major effect on NO_x formation rates. The reaction mechanisms used to describe NO_x formation rates are given by the well-known Zeldovich mechanism. The model output results given in this article show an average deviation of about 12.0% from acquired measured NO_x data. The least squares interpolation approach indicates a negligible difference from the original model with an average deviation of 1.2% in 25 measurement points.

Keywords

model Zeldovich interpolation zero-dimensional engine thermodynamics

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Zero-dimensional modeling of NOx formation with least squares interpolation

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