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Extending HCCI Low Load Operation Using Chaos Prediction and Feedback Control Open Access


Other title
Type of item
Degree grantor
University of Alberta
Author or creator
Ghazimirsaied, Seyedahmad
Supervisor and department
Koch, Charles Robert (Mechanical Engineering)
Examining committee member and department
Olfert, Jason (Mechanical Engineering)
Lipsett, Mike (Mechanical Engineering)
Hayes, Robert E. (Chemical Engineering)
Koch, Charles Robert (Mechanical Engineering)
Department of Mechanical Engineering

Date accepted
Graduation date
Doctor of Philosophy
Degree level
Homogenous Charge Compression Ignition (HCCI) is a promising technology that offers high fuel economy and low oxides of nitrogen and particulate emission for automotive and stationary engines. A significant challenge with HCCI is the large number of partial burn/misfire cycles within the lean operation and the control of the combustion phasing. A detailed experimental and modeling investigation into the patterns of HCCI ignition timing and control based on deterministic structure of data points in HCCI combustion to reduce the high cyclic variations for operating conditions near misfire and to extend the HCCI operating range is the focus of this thesis. Nonlinear dynamics and chaos theory applied to a wide range of engine operating conditions show that unstable operation of HCCI with higher cyclic variations with a non-Gaussian distribution is observed near the partial burn and misfire region of the engine. In order to predict and control the ignition timing in the partial burn region of HCCI, the temporal dynamics of cyclic variation in HCCI engine near misfire is analyzed using chaotic theory methods. Closed loop ignition timing control is used to reduce cyclic combustion variations for an unstable operating range of the engine near misfire using fuel octane as the control input.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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