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Journal of Combustion
Volume 2016 (2016), Article ID 8593523, 9 pages
http://dx.doi.org/10.1155/2016/8593523
Review Article

Review of Sensing Methodologies for Estimation of Combustion Metrics

Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA

Received 3 July 2015; Accepted 10 January 2016

Academic Editor: Sergey M. Frolov

Copyright © 2016 Libin Jia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

For reduction of engine-out emissions and improvement of fuel economy, closed-loop control of the combustion process has been explored and documented by many researchers. In the closed-loop control, the engine control parameters are optimized according to the estimated instantaneous combustion metrics provided by the combustion sensing process. Combustion sensing process is primarily composed of two aspects: combustion response signal acquisition and response signal processing. As a number of different signals have been employed as the response signal and the signal processing techniques can be different, this paper did a review work concerning the two aspects: combustion response signals and signal processing techniques. In-cylinder pressure signal was not investigated as one of the response signals in this paper since it has been studied and documented in many publications and also due to its high cost and inconvenience in the application.