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TECHNICAL BRIEFS

Estimation and Prediction of In-Cylinder Chemical Species in a Gasoline Engine for Control Purposes

[+] Author and Article Information
P. Giansetti, Y. Chamaillard, P. Higelin, A. Charlet

PSA Peugeot-Citroën LME Université d’Orléans, Orleans, France

J. Dyn. Sys., Meas., Control 129(4), 534-540 (Oct 10, 2006) (7 pages) doi:10.1115/1.2719786 History: Received February 10, 2005; Revised October 10, 2006

To simultaneously reduce pollutant emissions and maximize the efficiency of spark ignition engines, several technologies have been developed that must be precisely controlled. For example, exhaust gas recirculation (EGR) is used to minimize NOx production, and running SI engines lean increases the global efficiency. Both these technologies have a deep impact not only on the air mass inside the cylinder, but also on the composition of the enclosed gas. Intake manifold pressure and temperature coupled to a combustion equation permit an estimate of the in-cylinder gas composition which is predominant for combustion process behavior. In-cylinder gas composition must be known before the injection of the fuel is performed, to control the engine performance and emissions. This paper proposes a linear Luenberger observer based on a physical model to predict in-cylinder gas composition for engine control purposes.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 2

Schema of the distribution of the different gases

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Figure 3

Error and standard deviation for the manifold pressure and temperature

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Figure 4

Prediction of the intake manifold pressure and temperature

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Figure 5

Evolution of the concentration of the different gases in the intake manifold

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Figure 6

Evolution of the concentration of the different gases in the cylinder before (bc) and after (ac) combustion

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Figure 7

Dioxygen fuel equivalent ratio at the throttle and in the cylinder

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