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Microwave Diagnostics of Intake and Exhaust Valves
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English
Abstract
The object of microwave diagnostics is to provide accurate, noninvasive measurements upon engine. This paper deals in particular with experiments performed upon the valves of a Buick V-6 engine. A microprocessor controlled data processing system is described that (1) collects and stores, in digital form, the microwave signal developed during several engine cycles (2) produces a very high resolution computer print out of the stored signal correlated with engine crank angle, and (3) outputs a printed analysis of every microwave resonance found in the signal. Exhaust valve motion produces a directly related shift in the crank angle position of a resonance. The magnitude of the shift in the TE111 mode resonance is 7 degrees for one cycle in the change of this valve. The maximum displacement of this valve into the cylinder is .200 inch. A displacement of .005 inch can be measured.
Citation
Merlo, A., "Microwave Diagnostics of Intake and Exhaust Valves," SAE Technical Paper 830275, 1983, https://doi.org/10.4271/830275.Also In
References
- Merlo A. L. “Combustion Chamber Investigations by Means of Microwave Resonances” IEEE Transactions on Industrial Electronics and Control Instrumentation, v IEC - 17 April 1970 60 66
- Merlo A. L. “Microwave Signal Analysis for Engine Diagnostics” MIDCON/81 Professional Program Session Record #4, Vehicle Diagnostics
- Merlo A. L. “Detection of Missing Bearing Clips Using Microwave Resonance” SAE International Congress and Exposition Feb 22-26 1982 SAE Paper # 820484
- Rado W. G. “Characteristics of Plasma Generated by Combustion in a Spark Ignition Engine” Journal of Applied Physics 46 6 June 1975 2468 2474
- Ward M. A. V. “Interaction of Propane-Air Laminar Flame Plasmas with the Microwave TM010 Mode Excited in a Cylinderical Combustion Bomb Cavity” Journal of Micrwave Power 14 3 1979 241 259
- Lienesch John H. Krage Mark K. “Using Microwaves to Phase Cylinder Pressure to Crankshaft Position” SAE paper # 790103 March 2 1979
- Merlo A. L. U. S. Patents 3, 589, 177, 3, 703, 825 “Combustion Microwave Diagnostic System 1971, 1972