In-cylinder pressure measurements with optical fiber and piezoelectric pressure transducers.
Date of Award
Mechanical, Automotive, and Materials Engineering
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Highly accurate cylinder pressure data can be acquired using a wall-mounted and water-cooled quartz piezoelectric transducer. However, this type of transducer does not satisfy the cost and packaging constraints for use in a production engine application. A potential solution to these issues is the much smaller and less expensive optical fiber based pressure transducer. This research compares Kistler piezoelectric transducers to Optrand optical fiber transducers. The influence of the transducer type and mounting arrangement on the quality of cylinder pressure data was examined. The transducers were evaluated on a DaimlerChrysler 4.7L V-8 Compressed Natural Gas fuelled test engine. The analysis method is comprised of examining measured individual cycle and ensemble-averaged cylinder pressure records to assess the quality of the data and its potential usefulness for engine management. The variation in performance in terms of thermal shock error among the four Optrand transducers was much larger than those among the four Kistler transducers. The best performing Optrand transducer both over and underestimated cylinder pressure, leading to more accurate results of Indicated Mean Effective Pressure and overestimations in peak cylinder pressure compared to the Kistler transducer which always underestimated cylinder pressure. (Abstract shortened by UMI.)Dept. of Mechanical, Automotive, and Materials Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2002 .R68. Source: Masters Abstracts International, Volume: 44-01, page: 0427. Thesis (M.A.Sc.)--University of Windsor (Canada), 2002.
Roth, Kevin J., "In-cylinder pressure measurements with optical fiber and piezoelectric pressure transducers." (2002). Electronic Theses and Dissertations. 2422.