Temperature control by hardware implemented recurrent fuzzy controller

Hardware implementation of a TSK-type recurrent fuzzy network (TRFN-H) for water bath temperature control is proposed in this paper. The TRFN-H is constructed from recurrent fuzzy if-then rules and are 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. After the network is designed, it is realized on a FPGA chip. Good performance of TRFN-H chip is verified from comparisons with PC-based PID and fuzzy controller for different sets of experiments on water-bath temperature control.