The fuzzy controller by programmable logic circuit

The paper introduces a fuzzy controller based on an in-system programmable logic circuit. The fuzzy transformation of accurate input data, fuzzy control rules based on observing the control action and the user's experience, fuzzy decision of output can be carried out by the programmable device. Owing to using VHDL language to write fuzzy rules, the characteristic of this controller is that the fuzzy rules can be modified at any moment even if working. The paper gives the controller's working principle and the source code of VHDL.