For reduction of engine-out emissions and improvement of fuel economy, closed-loop control of the combustion process has been\nexplored and documented by many researchers. In the closed-loop control, the engine control parameters are optimized according\nto the estimated instantaneous combustion metrics provided by the combustion sensing process. Combustion sensing process is\nprimarily composed of two aspects: combustion response signal acquisition and response signal processing.As a number of different\nsignals have been employed as the response signal and the signal processing techniques can be different, this paper did a review\nwork concerning the two aspects: combustion response signals and signal processing techniques. In-cylinder pressure signal was\nnot investigated as one of the response signals in this paper since it has been studied and documented in many publications and\nalso due to its high cost and inconvenience in the application.
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