Water bath temperature control by a recurrent fuzzy controller and its FPGA implementation
Chia-Feng Juang
Jung-Shing Chen
Dept. of Electr. Eng., Nat. Chung Hsing Univ., Taichung, Taiwan;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: June 2006
Volume: 53,
Issue: 3
On page(s): 941- 949
ISSN: 0278-0046
INSPEC Accession Number: 8933257
Digital Object Identifier: 10.1109/TIE.2006.874260
Current Version Published: 2006-05-30
Abstract
A hardware implementation of the Takagi-Sugeno-Kan (TSK)-type recurrent fuzzy network (TRFN-H) for water bath temperature control is proposed in this paper. The TRFN-H is constructed by a series of recurrent fuzzy if-then rules built on-line through concurrent structure and parameter learning. To design TRFN-H for temperature control, the direct inverse control configuration is adopted, and owing to the structure of TRFN-H, no a priori knowledge of the plant order is required, which eases the design process. Due to the powerful learning ability of TRFN-H, a small network is generated, which significantly reduces the hardware implementation cost. After the network is designed, it is realized on a field-programmable gate array (FPGA) chip. Because both the rule and input variable numbers in TRFN-H are small, it is implemented by combinational circuits directly without using any memory. The good performance of the TRFN-H chip is verified from comparisons with computer-based proportional-integral fuzzy (PI) and neural network controllers for different sets of experiments on water bath temperature control.
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