Development of single-chip fuzzy controller based on FFSI in binary

Length and concise structure of fuzzy logic reasoning program and its real-time reasoning characteristic have effects on the performance of a digital single-chip fuzzy controller. The control effect of a digital fuzzy controller based on looking up fuzzy control responding table is only relative to the table and not relative to the fuzzy control rules in the practical control process. Aiming at above problem and having combined fuzzy logic reasoning with digital operational characteristics of a single-chip microcomputer, functioning-fuzzy-subset inference (FFSI) in binary, in which triangle membership functions of error and error-in-change are all represented in binary and singleton membership functions of control variable is binary too, is introduced. The circuit principle plans of a single-chip fuzzy controller is presented for development of its hardware, and the primary program structure, fuzzy logic reasoning subroutine, serial communication subroutine with PC and reliability design of the fuzzy controller are discussed. The control of indoor temperature by a fuzzy controller is conducted by a testing-room thermodynamic system.