Affiliation:
1. Mechanical Engineering Department, Wayne State University, 5050 Anthony Wayne Drive, Detroit, MI 48202
Abstract
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. The statistical model of a harmonic component of the engine torque developed in the first part of the paper is used to achieve this goal. The analysis of the half-order components of the gas pressure torque permits to identify distinct phase angle domains of the resultant torque vector that are specific for the deficiencies of given cylinders. Based on the rigid-body model of the crankshaft, these phase angle domains are correlated to the phase angle domains of the half-order component of the crankshaft speed. Then, the phase angle of the half-order component of the measured crankshaft speed will identify the deficient cylinder. The amplitude of the first major harmonic component of the measured crankshaft speed is correlated to the corresponding harmonic order of the gas pressure torque and is used to calculate the MIP of the engine. The accuracy limits of this “software dynamometer” are also presented.
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference6 articles.
1. 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.
2. Taraza, D., 2001, “Statistical Model and Simulation of Engine Torque and Speed Correlation,” SAE Paper No. 2001-01-3686.
3. Taraza, D., 2002, “Accuracy Limits of IMEP Determination from Crankshaft Speed Measurements,” SAE Paper No. 2002-01-0331.
4. 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.
5. 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.
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