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Cylinder Pressure Based Cylinder Charge Estimation in Diesel Engines with Dual Independent Variable Valve Timing
Linköping University, Department of Electrical Engineering, Vehicular Systems. Linköping University, Faculty of Science & Engineering.
Scania CV AB, Sweden.
Scania CV AB, Sweden.
2018 (English)In: SAE Technical Paper, Society of Automotive Engineers, 2018, no 2018-01-0862Conference paper, Published paper (Refereed)
Abstract [en]

With stricter emission legislations and demands on low fuel consumption, new engine technologies are continuously investigated. At the same time the accuracy in the over all engine control and diagnosis and hence also the required estimation accuracy is tightened. Central for the internal combustion control is the trapped cylinder charge and composition Traditionally cylinder charge is estimated using mean intake manifold pressure and engine speed in a two dimensional lookup table. With the introduction of variable valve timing, two additional degrees of freedom are introduced that makes this approach very time consuming and therefore  expensive. Especially if the cam phasers are given large  enough authority to offer powerful thermal management possibilities. The paper presents a physical model for estimating in-cylinder trapped mass and residual gas fraction utilizing cylinder pressure measurements, and intake and exhaust valve lift profiles. The cylinder pressure at intake and exhaust valve opening and closing together with manifold pressures and temperatures are combined with thermodynamic and heat transfer models to calculate the trapped cylinder mass. The estimator is validated on test data from a prototype engine with dual independent cam phasers under a wide range of operating conditions, including large variations in valve timing ranging from scavenging to early exhaust cam timing for thermal management. The main contribution is the developed model, with the ability to accurately estimate the trapped cylinder charge during large independent variations in both intake and exhaust valve timing.

Place, publisher, year, edition, pages
Society of Automotive Engineers, 2018. no 2018-01-0862
Series
SAE Technical Papers, ISSN 0148-7191, E-ISSN 2688-3627 ; 2018-01-0862
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-161690DOI: 10.4271/2018-01-0862OAI: oai:DiVA.org:liu-161690DiVA, id: diva2:1368270
Conference
WCX World Congress Experience, 10–12 April 2018, Detroit, United States
Available from: 2019-11-06 Created: 2019-11-06 Last updated: 2019-11-06

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Thomasson, Andreas

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • 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