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TECHNICAL PAPERS: Internal Combustion Engines

Statistical Correlation Between the Crankshaft’s Speed Variation and Engine Performance—Part II: Detection of Deficient Cylinders and Mean Indicated Pressure Calculation

[+] Author and Article Information
D. Taraza

Mechanical Engineering Department, Wayne State University, 5050 Anthony Wayne Drive, Detroit, MI 48202

J. Eng. Gas Turbines Power 125(3), 797-803 (Aug 15, 2003) (7 pages) doi:10.1115/1.1563245 History: Received September 01, 2001; Revised July 01, 2002; Online August 15, 2003
Copyright © 2003 by ASME
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References

Taraza,  D., 2003, “Statistical Correlation Between the Crankshaft’s Speed Variation and Engine Performance—Part I: Theoretical Model,” ASME J. Eng. Gas Turbines Power, 125, pp. 791–796.
Taraza, D., 2001, “Statistical Model and Simulation of Engine Torque and Speed Correlation,” SAE Paper No. 2001-01-3686.
Taraza, D., 2002, “Accuracy Limits of IMEP Determination from Crankshaft Speed Measurements,” SAE Paper No. 2002-01-0331.
Taraza, D., 2000, “Statistical Correlation Between the Crankshaft’s Speed Variation and the Contribution of Individual Cylinders to the Total Engine Output,” Proceedings of the Fall Technical Conference ASME, New York, ICE-Vol. 35, pp. 81–93.
Taraza, D., 2001, “Quantifying Relationships Between the Crankshaft’s Speed Variation and the Gas Pressure Torque,” SI Engine Modeling and Simulation (SP-1606), SAE, Warrendale, PA. pp. 89–101.
Hafner, K. E., and Maass, H., 1985, Torsionsschwingungen in der Verbrennungskraftmaschine Springer-Verlag, New York, pp. 141–143.

Figures

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The variation of the MIP for individual cylinders during ten successive cycles. Steady-state operation at 1189±3 rpm and cylinder #4 almost disabled.
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Statistical estimation of the mean value and phase domain of the half-order component of the GPT and its correlation with the corresponding harmonic component of the crankshaft speed
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The phase angles domains of the vectors representing the half-order component of the crankshaft’s speed, corresponding to deficiencies of specific cylinders
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Position of the ellipse of dispersion for the half-order component of the crankshaft speed, corresponding to different degrees of reduced contribution of cylinder #4
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Positions of the tips of the measured half-order speed vectors for different malfunctions in the operation of the cylinders
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The half-order vectors of the measured crankshaft’s speed and their mean value (dark arrow) for cylinder #6 contributing 19% less than the other five cylinders
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The half-order vectors of the measured crankshaft’s speed and their mean value (dark arrow) for cylinder #6 contributing 7% less than the other five cylinders
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Correlations between the MIP and the amplitudes of the third-order harmonic component of TGP for different engine speeds
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Summation of the third-order torque vectors
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The phase angle between the third-order speed vector and the vector representing the resultant of the GPT and RIT for ten successive cycles
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Correlation between the third-order components of the torques acting on the crankshaft
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The phase angle diagram of the half-order torque vectors; cylinder #4 disabled

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