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Model-Based Control of Two-Stage Turbochargers for Heavy-Duty Diesel Engines
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, The Institute of Technology.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The concept of downsizing has proved to be a succesful method to improve engine efficiency. The engine key component is the turbocharging system that use excess energy in the exhaust gases to compress air into the cylinder. There are different types of supercharging systems, in the thesis a serial turbo system is modeled together with a complete six cylinder engine. A model-based controller is developed that regulates the intake pressure to a certain reference. The controller operates in modes that are defined by the engine operating point. To control the turbochargers it is necessary to have knowledge about the energy in the exhaust gases. A dynamic temperature model has therefore been analyzed, which has led to surprising results regarding the temperature measurements made in the test cells. This is analyzed and improvements are suggested.The engine model is validated and the system, including controller, is evaluated in certain simulations. The serial turbo concept is compared to a VGT turbo system, which gives a hint of the possible advantages of serial turbo charging.

Abstract [sv]

Konceptet downsizing är bevisligen en mycket kapabel lösning för att höja en motors verkningsgrad. Nyckelkomponenten är turbosystemet som använder överskottsenergi i avgaserna för att komprimera in luft till cylindern. Det finns olika typer av turbosystem, i denna uppsats modelleras en seriell turbostruktur tillsammans med en komplett sexcylindrig motor. En modellbaserad regulator utvecklas för att reglera insugstrycket. Regulatorn arbetar i moder som definieras av motorns arbetspunkt. För att styra turboladdningen på ett bra sätt är det viktigt att ha vetskap om energin i motorns avgaser, varpå mer dynamik har införts i befintlig temperaturmodell. Temperaturmätningar har lett till förvånande och teoretiskt motstridiga resultat. Detta har undersökts och förslag på förbättringar tas fram.Motormodellen har validerats och systemet tillsammans med regulatorn har utvärderats i simuleringsexperiment. Det seriella turbosystemet jämförs med ett VGT-system, varpå potentiella fördelar hos en seriell dubbelturbo diskuteras.

Place, publisher, year, edition, pages
2014. , 73 p.
Keyword [en]
MVEM, Turbo, Control, Model Based, Exhaust
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-109351ISRN: LiTH-ISY-EX--14/4766--SEOAI: oai:DiVA.org:liu-109351DiVA: diva2:737973
External cooperation
Scania CV
Subject / course
Vehicular Systems
Presentation
2014-06-13, Systemet, Linköpings Universitet, 581 83, Linköping, 14:15 (Swedish)
Supervisors
Examiners
Available from: 2014-08-15 Created: 2014-08-14 Last updated: 2014-08-18Bibliographically approved

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Model-Based Control of Two-Stage Turbochargers for Heavy-Duty Diesel Engines(1034 kB)295 downloads
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Vehicular SystemsThe Institute of Technology
Control Engineering

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • Other style
More styles
Language
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Output format
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