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A New Method for Simultaneous Determination of the TDC Offset and the Pressure Offset in Fired Cylinders of an Internal Combustion Engine

Author

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  • Urban Žvar Baškovič

    (Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia)

  • Rok Vihar

    (Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia)

  • Igor Mele

    (Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia)

  • Tomaž Katrašnik

    (Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia)

Abstract

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.

Suggested Citation

  • Urban Žvar Baškovič & Rok Vihar & Igor Mele & Tomaž Katrašnik, 2017. "A New Method for Simultaneous Determination of the TDC Offset and the Pressure Offset in Fired Cylinders of an Internal Combustion Engine," Energies, MDPI, vol. 10(1), pages 1-22, January.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:1:p:143-:d:88581
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    References listed on IDEAS

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    1. Lee, Kyeonghyeon & Cho, Seokwon & Kim, Namho & Min, Kyoungdoug, 2015. "A study on combustion control and operating range expansion of gasoline HCCI," Energy, Elsevier, vol. 91(C), pages 1038-1048.
    2. Ceviz, M. Akif & Çavuşoğlu, Bülent & Kaya, Ferhat & Öner, İ. Volkan, 2011. "Determination of cycle number for real in-cylinder pressure cycle analysis in internal combustion engines," Energy, Elsevier, vol. 36(5), pages 2465-2472.
    3. Verschaeren, Roel & Schaepdryver, Wouter & Serruys, Thomas & Bastiaen, Marc & Vervaeke, Lieven & Verhelst, Sebastian, 2014. "Experimental study of NOx reduction on a medium speed heavy duty diesel engine by the application of EGR (exhaust gas recirculation) and Miller timing," Energy, Elsevier, vol. 76(C), pages 614-621.
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    Cited by:

    1. Zhaojie Shen & Wenzheng Cui & Xiaodong Ju & Zhongchang Liu & Shaohua Wu & Jianguo Yang, 2017. "Numeric Investigation of Gas Distribution in the Intake Manifold and Intake Ports of a Multi-Cylinder Diesel Engine Refined for Exhaust Gas Stratification," Energies, MDPI, vol. 10(11), pages 1-13, November.
    2. Carlo Caligiuri & Urban Žvar Baškovič & Massimiliano Renzi & Tine Seljak & Samuel Rodman Oprešnik & Marco Baratieri & Tomaž Katrašnik, 2021. "Complementing Syngas with Natural Gas in Spark Ignition Engines for Power Production: Effects on Emissions and Combustion," Energies, MDPI, vol. 14(12), pages 1-18, June.

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