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Indexed by:会议论文

Date of Publication:2016-07-27

Included Journals:EI、CPCI-S、Scopus

Volume:2016-August

Page Number:8986-8992

Key Words:Combustion phase optimization; IMEP; CA50; gradient descent method; SI gasoline engine

Abstract:In this paper, combustion phase optimization is analyzed and ignition timing of SI engines is controlled to maximize the fuel efficiency, in which the optimum set point of combustion phase and moving average based control strategy are discussed. To extract the fuel efficiency information from combustion, in-cylinder pressure sensor is available to calculate combustion phase and IMEP. Then, CA50 is employed as combustion phase indicator, and gradient descent method is utilized to seek the set point of CA50 that ensures the maximum statistical IMEP, satisfying the probability constraint with least cycles. On the evaluation of consecutive in-cylinder pressure traces, moving average based feedback controller is designed to track the set point of CA50 by adjusting ignition timing. Finally, the proposed strategy is validated by the experiment on a SI gasoline engine.