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Control Oriented Modeling of the Dynamics in a Catalytic Converter
Linköping University, Department of Electrical Engineering.
Linköping University, Department of Electrical Engineering.
2005 (English)Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesisAlternative title
Modellering av dynamiken i en katalysator med avseende på reglering (Swedish)
Abstract [sv]

Avgasmängden som bensindrivna fordon tillåts släppa ut minskas hela tiden. Ett sätt att möta framtida krav, är att förbättra katalysatorns effektivitet. För att göra detta kan luft-bränsle-förhållandet regleras med avseende på syrelagringen i katalysatorn, istället för som idag, reglera mot stökiometriskt blandningsförhållande. Eftersom syrelagringen inte går att mäta med en givare behövs en modell som beskriver katalysatorns dynamiska egenskaper. Tre sådana modeller har undersökts, utvärderats och jämförts.

Två av modellerna har implementerats i Matlab/Simulink och anpassats till mätningar från en experimentuppställning. För att kunna observera syrelagringen online valdes slutligen en av modellerna ut, och implementerades i ett Extended Kalman filter.

Ytterligare arbete behöver läggas ner på den mest lovande modellen, och detsamma gäller för Kalmanfiltret, men på sikt förväntas resultaten kunna bli bra.

Abstract [en]

The legal amount of emissions that vehicles with spark ignited engines are allowed to produce are steadily reduced over time. To meet future emission requirements it is desirable to make the catalytic converter work in a more efficient way. One way to do this is to control the air-fuel-ratio according to the oxygen storage level in the converter, instead of, as is done today, always trying to keep it close to stoichiometric. The oxygen storage level cannot be measured by a sensor. Hence, a model describing the dynamic behaviors of the converter is needed to observe this level. Three such models have been examined, validated, and compared.

Two of these models have been implemented in Matlab/Simulink and adapted to measurements from an experimental setup. Finally, one of the models was chosen to be incorporated in an extended Kalman filter (EKF), in order to make it possible to observe the oxygen storage level online.

The model that shows best potential needs further work, and the EKF is working with flaws, but overall the results are promising.

Place, publisher, year, edition, pages
Institutionen för systemteknik , 2005.
Keyword [en]
catalytic converter, TWC, oxygen storage, lambda, observer, EKF, modeling, simulation
Keyword [sv]
syrelagring, lambda, observatör, EKF, modellering, simulering, katalysator, TWC
National Category
Information Science
Identifiers
URN: urn:nbn:se:liu:diva-4154ISRN: LiTH-ISY-EX--05/3707--SEOAI: oai:DiVA.org:liu-4154DiVA: diva2:20547
Uppsok
teknik
Supervisors
Examiners
Available from: 2005-10-13 Created: 2005-10-13

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • nn-NB
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Output format
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