A new method for simultaneous determination of the TDC offset and the pressure offset in fired cylinders of an internal combustion engine
Žvar Baškovič, Urban (Author), Vihar, Rok (Author), Mele, Igor (Author), Katrašnik, Tomaž (Author)

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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 engines, thermodynamic analysis, TDC offset, pressure offset, offset correction algorithm
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Number of pages:f. 1-22
Numbering:Vol. 10, iss. 1
ISSN on article:1996-1073
DOI:10.3390/en10010143 Link is opened in a new window
COBISS.SI-ID:15224091 Link is opened in a new window
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Record is a part of a journal

Shortened title:Energies
Publisher:Molecular Diversity Preservation International, = MDPI
COBISS.SI-ID:518046745 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0401
Name:Energetsko strojništvo

Secondary language

Keywords:motorji z notranjim zgorevanjem, termodinamske analize, zamik zgornje mrtve lege beta, zamik tlaka v valju, algoritem izračuna zamika

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