title: Experimental comparisons of hypothesis test and moving average based combustion phase controllers.
abstract: For engine control, combustion phase is the most effective and direct parameter to improve fuel efficiency. In this paper, the statistical control strategy based on hypothesis test criterion is discussed. Taking location of peak pressure (LPP) as combustion phase indicator, the statistical model of LPP is first proposed, and then the controller design method is discussed on the basis of both Z and T tests. For comparison, moving average based control strategy is also presented and implemented in this study. The experiments on a spark ignition gasoline engine at various operating conditions show that the hypothesis test based controller is able to regulate LPP close to set point while maintaining the rapid transient response, and the variance of LPP is also well constrained.
authors.affiliation: Department of Control Science and Engineering, Jilin University, 130025 Changchun, China; Department of Engineering and Applied Sciences, Sophia University, 102-8554 Tokyo, Japan.
authors.forename: Jinwu
authors.initials: J
authors.lastname: Gao
authors.affiliation: School of Control Science and Engineering, Dalian University of Technology, 116024 Dalian, China.
authors.forename: Yuhu
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Department of Engineering and Applied Sciences, Sophia University, 102-8554 Tokyo, Japan. Electronic address: tetu-sin@sophia.ac.jp.
authors.forename: Tielong
authors.initials: T
authors.lastname: Shen
keywords: Combustion phase control; Engine control; Hypothesis test; Statistical control; Variance of LPP