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Modeling of NOx formation in heavy duty engines

Muric, Kenan (2011) In ISSN 0280-5316
Department of Automatic Control
Abstract
In order to apply combustion feedback control in diesel engines to control pollution formation,
good models are needed to estimate the states. One of those would be NOx levels which are
regulated by European law. There are conventional sensors on the market that can measure
NOx but these are too slow for in-cycle feedback control.
The purpose of this thesis was to derive a model to estimate NOx where the engine very well
could have a built in EGR function. The model seems promising, however additional tuning and
modification is needed for it to be fully useful in practice.
The model presented in this thesis is a zero-dimensional two-zone model. The NOx model
assumes that combustion locally occurs at stoichiometric conditions. Model... (More)
In order to apply combustion feedback control in diesel engines to control pollution formation,
good models are needed to estimate the states. One of those would be NOx levels which are
regulated by European law. There are conventional sensors on the market that can measure
NOx but these are too slow for in-cycle feedback control.
The purpose of this thesis was to derive a model to estimate NOx where the engine very well
could have a built in EGR function. The model seems promising, however additional tuning and
modification is needed for it to be fully useful in practice.
The model presented in this thesis is a zero-dimensional two-zone model. The NOx model
assumes that combustion locally occurs at stoichiometric conditions. Model validation is done
against single-cylinder engine NOx output data received from the Royal Institute of Technology
(KTH). Least-squares fitting methods are also used to simplify calculations considerably. The
results indicate that the model is applicable in practice. (Less)
Please use this url to cite or link to this publication:
author
Muric, Kenan
supervisor
organization
alternative title
Modellering av NOx –bildning i HD-motorer
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
ISSN 0280-5316
other publication id
ISRN LUTFD2/TFRT--5887--SE
language
English
additional info
month=September
id
2968498
date added to LUP
2012-08-20 12:45:36
date last changed
2012-08-22 11:35:39
@misc{2968498,
  abstract     = {In order to apply combustion feedback control in diesel engines to control pollution formation,
good models are needed to estimate the states. One of those would be NOx levels which are
regulated by European law. There are conventional sensors on the market that can measure
NOx but these are too slow for in-cycle feedback control.
The purpose of this thesis was to derive a model to estimate NOx where the engine very well
could have a built in EGR function. The model seems promising, however additional tuning and
modification is needed for it to be fully useful in practice.
The model presented in this thesis is a zero-dimensional two-zone model. The NOx model
assumes that combustion locally occurs at stoichiometric conditions. Model validation is done
against single-cylinder engine NOx output data received from the Royal Institute of Technology
(KTH). Least-squares fitting methods are also used to simplify calculations considerably. The
results indicate that the model is applicable in practice.},
  author       = {Muric, Kenan},
  language     = {eng},
  note         = {Student Paper},
  series       = {ISSN 0280-5316},
  title        = {Modeling of NOx formation in heavy duty engines},
  year         = {2011},
}