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Virtual Sensors for Combustion Parameters Based on In-Cylinder Pressure
Linköping University, Department of Electrical Engineering, Vehicular Systems.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 300 HE creditsStudent thesisAlternative title
Skattning av förbränningsparametrar baserat på cylindertryckmätning (Swedish)
Abstract [en]

Typically the combustion in engines are open-loop controlled. By using an in-cylinder pressure sensor it is possible to create virtual sensors for closed-loop combustion control (CLCC). With CLCC it is possible to counteract dynamic effects as component ageing, fuel type and cylinder variance.

A virtual sensor system was implemented based on a one-zone heat-release analysis, including signal processing of the pressure sensor input. A parametrisation of the heat-release based on several Vibe functions was implemented with good results.

The major focus of the virtual sensor system was to perform a tolerance analysis on experimental data, where typical error sources in a production heavy-duty vehicle were identified and their effect on the estimates quantified. It could be concluded that estimates are very much dependent on the choice of heat-release and specific heat ratio models. Especially crank angle phasing has a large impact on estimation performance, stressing the importance of accounting for crankshaft torsion in production vehicles. Biodiesel advances the combustion angle and give a lower IMEP and total heat amount compared to standard diesel. However, error sensitivity is not affected.

Further investigations must be made on improving the signal processing in terms of gain error compensation and filtering. Also a better understanding of how errors propagate between subsystems in a CLCC system is required for successful implementation.

Place, publisher, year, edition, pages
2015. , 60 p.
Keyword [en]
CLCC, virtual sensors, combustion parameters, in-cylinder pressure, heat release, heat-release, heavy duty vehicle
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:liu:diva-123490ISRN: LiTH-ISY-EX--15/4913--SEOAI: diva2:885542
External cooperation
Scania CV AB
Subject / course
Vehicular Systems
Available from: 2015-12-23 Created: 2015-12-18 Last updated: 2015-12-23Bibliographically approved

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Johansson, Tobias
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