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Model Based Control of Throttle, EGR and Wastegate: A System Analysis of the Gas Flows in an SI-Engine
Linköping University, Department of Electrical Engineering, Vehicular Systems.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Due to governmental requirements on low exhaust gas emissions and the drivers request of fast response, it is important to be able to control the gas flow in a spark ignited engine accurately. The air into the cylinder is directly related to the torque generated by the engine. The technique with recirculation of exhaust gases (EGR) affect the air flow into the cylinder and increase the complexity of the control problem. In this thesis a mean value model for a spark ignited engine has been created. The basis was a diesel model from Linköping University that has been modified and parameterized with data from a test cell. The model has been used to study the gas exchange system with respect to the dynamic behaviors and nonlinearities that occur when the three actuators (throttle, wastegate and EGR-valve) are changed. Based on this analysis, some different control strategies have been developed and tested on the model. The presented results show that different control strategies give different behaviors and there is a trade-off between fast torque response and high precision for controlling the EGR-ratio. A control strategy is proposed containing two main feedback loops, prefiltering of the reference signal and a feedforward part.

Place, publisher, year, edition, pages
2017. , p. 114
Keywords [en]
Model, Control, SI-engine, gas-flow, system analysis
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-140533ISRN: LiTH-ISY-EX--17/5035--SEOAI: oai:DiVA.org:liu-140533DiVA, id: diva2:1138994
External cooperation
Scania CV AB
Subject / course
Vehicular Systems
Presentation
2017-05-05, 10:15 (Swedish)
Supervisors
Examiners
Available from: 2017-09-07 Created: 2017-09-06 Last updated: 2017-09-07Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf