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Gas flow observer for Diesel Engines with EGR
Linköping University, Department of Electrical Engineering.
2005 (English)Independent thesis Basic level (professional degree)Student thesisAlternative title
Gasflödesobservatör för dieselmotorer med EGR (Swedish)
Abstract [en]

Due to stricter emission legislation, there is a need for more efficient control of diesel engines with exhaust gas recirculation(EGR). In particular, it is important to estimate the air/fuel ratio accurately in transients. Therefore a new engine gas flow model has been developed. This model divides the gas into one part for oxygen and one part for inert gases. Based on this model an observer has been designed to estimate the oxygen concentration in the gas going into the engine, which can be used to calculate the air/fuel ratio. This observer can also be used to estimate the intake manifold pressure. The advantage of estimating the pressure, instead of low pass filtering the noisy signal, is that the observer does not cause time delay.

Place, publisher, year, edition, pages
Institutionen för systemteknik , 2005. , 42 p.
Keyword [en]
Technology, EGR, Mean Value Engine Model, Observer, Lambda
Keyword [sv]
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-2943ISRN: LITH-ISY-EX--05/3692--SEOAI: diva2:20286
Available from: 2005-06-16 Created: 2005-06-16

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