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Dynamic Piston Position Measurements Using a Laser Range-Finding Technique
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Abstract
A nonintrusive diagnostic technique has been developed by which dynamic axial piston-position and tilt-angle measurements have been made in a single-cylinder research engine. A laser beam, introduced into the combustion chamber through an optical port in the cylinder head, was reflected by a polished surface on the piston crown. Motion of the reflected beam, carrying with it information on piston position and piston tilt, was monitored by a set of receiving optics. Piston motion was studied as a function of both engine speed and cylinder pressure (i.e., piston loading.) Measured axial piston-position was found to deviate from the theoretical position calculated from the measured crank-shaft position owing to the effects of tilt and piston loading. Furthermore, evidence of piston veer (tilt of the piston in a plane parallel to the axis of the wrist pin) was observed, which had an effect on the accuracy of the axial piston-position measurement. However, the piston-tilt measurement was less susceptible to the effects of piston veer, such that the magnitude and sense of piston tilt was found to be constant and repeatable. The phasing and duration of the tilt varied as functions of both engine speed and pressure loading. A physical explanation of the piston dynamics indicated by the data is proposed.
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Citation
Leschiutta, M., Eng, J., and Martin, J., "Dynamic Piston Position Measurements Using a Laser Range-Finding Technique," SAE Technical Paper 900482, 1990, https://doi.org/10.4271/900482.Also In
References
- Obert, E.F. Internal Combustion Engines and Air Pollution Third Harper & Row New York 1973 45
- Brown, W.L. “Methods for Evaluating Errors in Cylinder Pressure Measurement,” SAE Paper 670008 1967
- Lienesch, J.H. Krage, M.K. “Using Microwaves to Phase Cylinder Pressure to Crankshaft Position,” SAE Paper 790103 1979
- Merlo, A.L. “Combustion Chamber Investigations by Means of Microwave Resonances,” IEEE Transactions on Industrial Electronics and Control Instrumentation IECI-17 2 April 1970
- Krage, M.K. Lienesch, J.H. Violetta, D.M. “Dynamic Diesel Engine Timing with Microwaves - The General Motors Approach,” SAE Paper 820053 1982
- Yamanaka, T. Esaki, M. Kinoshita, M. “Measurement of TDC in Engine by Microwave Technique,” IEEE Transactions on Microwave Theory and Techniques MTT-33 12 December 1985
- Kim, K.S. Kim, S.S. “Measurement of Dynamic TDC in SI Engines Using Microwave Sensor, Proximity Probe, and Pressure Transducers,” SAE Paper 891823 1989
- Rocco, V. “Dynamic TDC and Thermodynamic Loss Angle Measurement in a D.I. Diesel Engine,” SAE Paper 851546 1985
- Ferguson, C.R. Warner, C.F. Gottschlich, R.W. Wahiduzzaman, S. “Using an Optical Proximiter to Phase Cylinder Pressure to Crankshaft Position,” SAE Paper 870478 1987
- Leschiutta, M. “Piston-Position Measurements in an IC Engine Using a Laser Range-Finding Technique,” University of Wisconsin Madison 1988
- American Institute of Physics American Institute of Physics Handbook Third McGraw-Hill New York 1972 6 111
- Shigley, J.E. Uicker, J.J. Theory of Machines and Mechanisms McGraw-Hill New York 1980
- Dowson, D. Economou, P.N. Ruddy, B.L. Strachan, P.J. Baker, A.J.S. “Piston Ring Lubrication - Part II Theoretical Analysis of a Single Ring and a Complete Ring Pack,” ASME, Energy Conservation Through Fluid Film Lubrication Technology, Frontiers in Research and Design, Winter Annual Meeting December 2-7 1979
- Heywood, J.B. Internal Combustion Engine Fundamentals McGraw-Hill New York 1988