LAPSE:2019.0805
Published Article
LAPSE:2019.0805
A New Method for Simultaneous Determination of the TDC Offset and the Pressure Offset in Fired Cylinders of an Internal Combustion Engine
Urban Žvar Baškovič, Rok Vihar, Igor Mele, Tomaž Katrašnik
July 26, 2019
An innovative computationally efficient method for the simultaneous determination of top dead centre (TDC) offset and pressure offset is presented. It is based on characteristic deviations of the rate of heat release (ROHR) that are specific for both offsets in compression phase and expansion phase after the end of combustion. These characteristic deviations of the ROHR are derived from first principles and they were also confirmed through manual shifts of the pressure trace. The ROHR is calculated based on the first law of thermodynamics using an in-cylinder pressure trace, engine geometrical parameters and operating point specific parameters. The method can be applied in off-line analyses using an averaged pressure trace or in on-line analyses using a single pressure trace. In both application areas the method simultaneously determines the TDC position and the pressure offset within a single processing of the pressure trace, whereas a second refinement step can be performed for obtaining more accurate results as correction factors are determined more accurately using nearly converged input data. Innovative analytic basis of the method allows for significant reduction of the computational times compared to the existing methods for the simultaneous determination of TDC offset and pressure offset in fired conditions. The method was validated on a heavy-duty and a light-duty diesel engine.
Keywords
internal combustion engine, offset correction algorithm, pressure offset, TDC offset, thermodynamic analysis
Subject
Suggested Citation
Žvar Baškovič U, Vihar R, Mele I, Katrašnik T. A New Method for Simultaneous Determination of the TDC Offset and the Pressure Offset in Fired Cylinders of an Internal Combustion Engine. (2019). LAPSE:2019.0805
Author Affiliations
Žvar Baškovič U: Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia
Vihar R: Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia
Mele I: Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia
Katrašnik T: Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia
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Journal Name
Energies
Volume
10
Issue
1
Article Number
E143
Year
2017
Publication Date
2017-01-23
Published Version
ISSN
1996-1073
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Original Submission
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PII: en10010143, Publication Type: Journal Article
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LAPSE:2019.0805
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doi:10.3390/en10010143
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Jul 26, 2019
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CC BY 4.0
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Jul 26, 2019
 
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Jul 26, 2019
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Calvin Tsay
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