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Permanent link (DOI): https://doi.org/10.7939/R3FX74841

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Iterative Learning Control for Fuel Robust HCCI Open Access

Descriptions

Other title
Subject/Keyword
ILC
Engine
Control
HCCI
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Slepicka, Craig E
Supervisor and department
Koch, Bob (Mechanical Engineering)
Examining committee member and department
Olfert, Jason (Mechanical Engineering)
Barczyk, Martin (Mechanical Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2016-03-31T15:46:26Z
Graduation date
2016-06
Degree
Master of Science
Degree level
Master's
Abstract
A dual-fuel system is used to control HCCI combustion timing and load in a CFR engine. The systems steady-state response to iso-octane and n-heptane injected energy is investigated then a dynamic ARMAX model is found using system identification. This model is used to design a norm-optimal Iterative Learning Controller (ILC). A new design for an ILC is developed that requires minimal system information and is called the model-less ILC. The stability and noise transference of this new design is investigated. Both ILC designs are then optimized for experimental implementation. To attenuate noise in the system two non-causal filters are developed to use with the ILC: a Gaussian and a zero-phase Butterworth. The filters are optimized on the ARMAX model and then implemented on the CFR engine. The three best ILC designs are are found to be the model-less with zero-phase Butterworth, norm-optimal with zero-phase Butterworth and a norm optimal without a filter. These ILC designs are compared to a Proportional-Integral (PI) controller and all three ILCs are found to out perform the PI controller. The three best ILC designs are then implemented on the engine with different operating conditions to explore the controller robustness. The intake temperature and compression ratio are varied and all ILC designs performed well with the ILC convergence time being most affected by these disturbances. The disturbance rejection of the controllers is then tested with the addition of biofuels: ethanol and biodiesel. The controllers are able to converge with the new fuel and out-performed the PI controller subject to the same biofuel disturbance. For the CFR engine with HCCI combustion performing repetitive steps in combustion timing and load, ILC outperforms PI control and is robust to changes in intake temperature, compression ratio and the addition of biofuels with little changes in the final iteration reference tracking error.
Language
English
DOI
doi:10.7939/R3FX74841
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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Last modified: 2016:06:16 17:10:06-06:00
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