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TECHNICAL PAPERS: Internal Combustion Engines

Design of Capacitance Probes for Oil Film Thickness Measurements Between the Piston Ring and Linear in Internal Combustion Engines

[+] Author and Article Information
D. O. Ducu

Detroit Diesel Corporation, 13400 Outer Drive, West, Detroit, MI 48239-4001

R. J. Donahue

Mercury Marine, W6250 Pioneer Road, Fond du Lac, WI 54936-1939

J. B. Ghandhi

University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706

J. Eng. Gas Turbines Power 123(3), 633-643 (Dec 01, 2000) (11 pages) doi:10.1115/1.1368116 History: Received August 01, 2000; Revised December 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Variation of oil dielectric constant with oil temperature
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Constant potential lines between the capacitance probe electrode and the piston ring (due to symmetry, only the half left of the probe’s axis of symmetry is shown)
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Error in the parallel plate equation due to neglecting fringing effects for rectangular probes of 62 and 127-μm width
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Geometry used to investigate plate effects, (a) ring profile curvature, (b) surface roughness, (c) nonparallel plates
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Relative error due to ring profile curvature, β=0.5. Solid line (Eq. (7)), open symbols derived from numerical solution.
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Relative error due to ring roughness. Solid line, Eq. (16), open symbols derived from numerical solution.
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Relative error due to a nonparallel geometry. Solid line, Eq. (18), open symbols derived from numerical solution.
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Procedure for designing a rectangular capacitance probe
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Rectangular capacitance probe
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Calibration of the RC voltage source circuit
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Capacitance probe data, upper graph raw voltage data, lower graph, uncorrected oil film thickness
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Measured surface profile of the top compression ring

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