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Compression Ratio and TDC Calibrations Using Temperature - Entropy Diagram
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 25, 1999 by SAE International in United States
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An extension of a thermodynamic methodology of TDC determination in IC engines is presented. The effect of an error on the TDC position coupled with an error on the compression ratio is analyzed in the temperature-entropy diagram. When the TDC position and the compression ratio are well calibrated, compression and expansion strokes under motoring conditions are symmetrical with respect to the peak temperature in the (T,S) diagram. Moreover, in case of an error on the TDC position, a loop appears, which has no thermodynamic significance. In the same way, in case of a compression ratio error the (T,S) diagram leans. Hence, an easy methodology has been conceived to obtain the right position of TDC and eventually to correct the compression ratio. This methodology is applied on motoring measurements to assess its performance.
CitationTazerout, M., Le Corre, O., and Stouffs, P., "Compression Ratio and TDC Calibrations Using Temperature - Entropy Diagram," SAE Technical Paper 1999-01-3509, 1999, https://doi.org/10.4271/1999-01-3509.
Data Sets - Support Documents
|Unnamed Dataset 1|
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- OSIRIS Guide Version 2.0 Copyright MACAO 1994-97
- Stas M. J. Thermodynamic Determination of T.D.C. in Piston Combustion Engines SAE Paper Nº 960610
- Tazerout M. Le Corre O. Rousseau S. TDC Determination in IC Engines Based on the Thermodynamic Analysis of the Temperature-Entropy Diagram SAE Technical Paper 1999-01-1489