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A Tappet Rotation Monitor Based on Light Reflectance - Development and Functional Testing
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English
Abstract
To meet a need identified in earlier valve train friction testing, a tappet rotation monitor was developed and implemented on a cam/tappet tribometer. The system was based on reflecting a light beam from a rotating and translating segmented surface onto a phototransistor. The resulting output was then processed by linear frequency to voltage conversion and multiple cycle integration. The experimental apparatus, signal processing circuit, and the testing circuit are presented. The multiple cycle integration was found to yield average tappet rotation as a function of cam shaft position. These results agreed well with earlier attempts to measure tappet rotation with high speed photography, were repeatable, and correlated with cam shaft speed. Some selected data is also presented which indicates that tappet rotation reduces cam/tappet friction.
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Pieprzak, J., Willermet, P., and Klassen, D., "A Tappet Rotation Monitor Based on Light Reflectance - Development and Functional Testing," SAE Technical Paper 890722, 1989, https://doi.org/10.4271/890722.Also In
References
- “Some Effects of Lubricant Composition and Tappet Rotation on Cam/Tappet Friction” Willermet P. A. Pieprzak J. M. ASME Journal of Tribology
- “Data-Acquisition Databook 1984, Volume 1 - Integrated Circuits” Analog Devices Inc. 1115 1126 1984
- “Electrical Engineering Concepts and Applications” Carlson A. F. Gisser D. G. 235 241