Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25270
Title: Fuzzy based variable step approaching digital control for plants with time delay
Authors: Li, G
Tsang, KM
Ho, SL 
Issue Date: 1998
Source: ISA transactions, 1998, v. 37, no. 3, p. 167-176
Abstract: A simple digital controller named Variable Step Approaching Digital Controller (VSADC) based on fuzzy concept is proposed for plants with time delay. The proposed controller is basically a modified Takagi-Sugeno Type Fuzzy Controller and can be represented by a compact analytical equation with only several adjustable parameters. The tuning rule and self tuning scheme in constant value control are developed. Detailed simulation investigation is carried out. Verification experiment using Process Trainer PT326 heating system as testbed is conducted. The proposed controller is compared with PID controller tuned by well-known Ziegler and Nicliols's ultimate cycle method. Both simulation and experimental results show that the proposed VSADC is effective in suppressing overshoot and in attenuating decaying oscillation cycles. It is also superior to PID controller in the control of plants with dominant time delay.
Keywords: Control algorithm
Digital control
Fuzzy control
Process control
Time delay
Publisher: Elsevier
Journal: ISA transactions 
ISSN: 0019-0578
DOI: 10.1016/S0019-0578(98)00016-0
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