The goal of this two-part paper is to develop a methodology using the variation of the measured crankshaft speed to calculate the mean indicated pressure (MIP) of a multicylinder engine and to detect cylinders that are lower contributors to the total engine output. Both the gas pressure torque and the crankshaft’s speed are, under steady-state operating conditions, periodic functions of the crank angle and may be expressed by Fourier series. For the lower harmonic orders, the dynamic response of the crankshaft approaches the response of a rigid body and that makes it is possible to establish correlations between the amplitudes and phases of the corresponding harmonic orders of the crankshaft’s speed and of the gas pressure torque. The inherent cycle-to-cycle variation in the operation of the cylinders requires a statistical approach to the problem. The first part of the paper introduces the statistical model for a harmonic component of the gas pressure torque and determines the correlation between the amplitudes and phases of the harmonic components of the gas pressure torque and the MIP of the engine. In the second part of the paper the statistical model is used to calculate the MIP and to detect deficient cylinders in the operation of a six-cylinder four-stroke diesel engine.
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July 2003
Technical Papers
Statistical Correlation Between the Crankshaft’s Speed Variation and Engine Performance—Part I: Theoretical Model
D. Taraza
D. Taraza
Mechanical Engineering Department, Wayne State University, 5050 Anthony Wayne Drive, Detroit, MI 48202
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D. Taraza
Mechanical Engineering Department, Wayne State University, 5050 Anthony Wayne Drive, Detroit, MI 48202
Contributed by the Internal Combustion Engine Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the ICE Division, September 2001; final revision received by the ASME Headquarters, July 2002. Associate Editor: D. Assanis.
J. Eng. Gas Turbines Power. Jul 2003, 125(3): 791-796 (6 pages)
Published Online: August 15, 2003
Article history
Received:
September 1, 2001
Revised:
July 1, 2002
Online:
August 15, 2003
Citation
Taraza, D. (August 15, 2003). "Statistical Correlation Between the Crankshaft’s Speed Variation and Engine Performance—Part I: Theoretical Model ." ASME. J. Eng. Gas Turbines Power. July 2003; 125(3): 791–796. https://doi.org/10.1115/1.1563244
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