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The Experimental Validation of a New Thermodynamic Method for TDC Determination
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 16, 2007 by Consiglio Nazionale delle Ricerche in Italy
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In-cylinder pressure analysis is becoming more and more important both for research and development purpose and for control and diagnosis of internal combustion engines; directly measured by means of a combustion chamber pressure transducers or evaluated by analysing instantaneous engine speed [1,2,3,4], in-cylinder pressure allows the evaluation of indicated mean effective pressure (IMEP), combustion heat release, combustion phase, friction pressure, etc…It is well known to internal combustion engine researchers that for a right evaluation of these quantities the exact determination of Top Dead Centre (TDC) is of vital importance: a 1° error on TDC determination can lead to evaluation errors of about 10% on the IMEP and 25% on the heat released by the combustion. In this paper the authors present the experimental validation of an original thermodynamic method for the correct evaluation of the “loss angle”, i.e. the angular phase shift between the TDC location and the pressure peak location. The validation has been carried out on a spark ignition engine comparing the results of the thermodynamic method, whose input is the in-cylinder pressure acquired in a “motored” cylinder (i.e. without combustion), with those obtained from a commercial available TDC sensor. The comparative tests aimed to characterize the precision of the proposed method.
CitationPipitone, E., Beccari, A., and Beccari, S., "The Experimental Validation of a New Thermodynamic Method for TDC Determination," SAE Technical Paper 2007-24-0052, 2007, https://doi.org/10.4271/2007-24-0052.
- LeeB., RizzoniG., GuezennecY., SolimanA., CavallettiM., WatersJ., “Engine Control Using Torque Estimation”, SAE Paper 2001-01-0995
- MoroD., CavinaN., PontiF., “In-Cylinder Pressure Reconstruction Based on Instantaneous Engine Speed Signal”, ASME Transactions, vol. 124, JANUARY 2002
- WangY., ChuF., “Application of non-linear observers to on-line estimation of indicated torque in automotive engines”, Proc. IMechE. Vol. 219 Part D: J. Automobile Engineering
- MoskwaJohn J., WangWenbo, BuchegerDuane J., “A New Methodology for Use in Engine Diagnostics and Control, Utilizing “Synthetic” Engine Variables: Theoretical and Experimental Results”, ASME Transactions, vol. 123, SEPTEMBER 2001
- TazeroutM., Le CorreO., StouffsP., “Compression Ratio and Tdc Calibrations Using Temperature-Entropy Diagram”, SAE Paper 1999-01-3509.
- TazeroutM., Le CorreO., RousseauS., “Tdc Determination in Ic Engines Based on the Thermodynamic Analysis of the Temperature-Entropy Diagram”, SAE Paper 1999-01-1489.
- YlvaNilsson , LarsEriksson , “Determining Tdc Position Using Symmetry and Other Methods”, SAE Paper 2004-01-1458.
- Morishita Mitsue, KushiyamaTadashi , “An Improved Method for Determining the Tdc Position in a PV Diagram”, SAE Paper 980625.
- HribernikA., “Statistical Determination of Correlation Between Pressure and Crankshaft Angle During Indication of Combustion Engines”, SAE Paper 982541.
- Stas MarekJ., “Thermodynamic Determination of T.D.C. in Piston Combustion Engines”, SAE Paper 960610.
- Pipitone Emiliano, Beccari Alberto. “A new thermodynamic method for TDC determination”, actually under review process, downloadable at www.pipitone.dima.unipa.it/pubblicazioni.htm.
- Randolph AndrewL., “Methods of processing cylinder-pressure transducer signals to maximize data accuracy”, SAE Paper 900170.
- Brunt MichaelF. J., Pond ChristopherR., “Evaluation of techniques for absolute cylinder pressure correction”, SAE Paper 970036.