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Utilizing Cylinder Pressure Data for Compression Ratio Estimation
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, The Institute of Technology.
2005 (English)In: Proceedings of the 16th IFAC World Congress, IFAC Papers Online, 2005, Vol. 38, 319-324 p.Conference paper (Refereed)
Abstract [en]

Four methods for compression ratio estimation based on cylinder pressure traces are developed and evaluated for simulated and experimental cycles. Three methods rely upon a model of polytropic compression for the cylinder pressure. It is shown that they give good estimates with a small bias at low compression ratios. A variable projection algorithm with a logarithmic norm of the cylinder pressure yields the smallest confidence intervals and shortest computational time for these three methods. This method is recommended when computational time is an important issue. The polytropic pressure model lacks information about heat transfer and therefore the estimation bias increases with compression ratio. The fourth method includes heat transfer, crevice effects, and a commonly used heat release model for firing cycles. This method estimates the compression ratio more accurately in terms of bias and variance. The method is more computationally demanding and thus recommended when estimation accuracy is the most important property. In order to estimate the compression ratio as accurately as possible, motored cycles with high initial pressure should be used.

Place, publisher, year, edition, pages
IFAC Papers Online, 2005. Vol. 38, 319-324 p.
Series
IFAC Proceedings Volumes, ISSN 1474-6670 ; 1
Keyword [en]
Nonlinear least squares; variable projection; weighted least squares; parameter estimation; SI engine
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:liu:diva-137735DOI: 10.3182/20050703-6-CZ-1902.01941OAI: oai:DiVA.org:liu-137735DiVA: diva2:1107373
Conference
The 16th IFAC World Congress, Prague, Czech Republic, 3-8 July 2005
Available from: 2017-06-09 Created: 2017-06-09 Last updated: 2017-06-14Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • modern-language-association-8th-edition
  • vancouver
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More styles
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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  • asciidoc
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