An improved PID-type fuzzy controller employing individual fuzzy P, fuzzy I and fuzzy D controllers

Since the emergence of fuzzy logic controllers (FLCs), control system engineers are in pursuit of more and more sophisticated versions of these controllers to achieve better performance, particularly in situations where providing a control action to even a minimal degree of satisfaction is a problem. The present paper is an attempt to contribute in this field. This work proposes a fuzzy PID controller comprising fuzzy P, fuzzy I and fuzzy D controllers in parallel. While fuzzy P and fuzzy I controllers are implemented in incremental form, the fuzzy D controller is realized in position form. Simulation studies reveal that the new scheme has a significantly improved performance compared to the Ziegler-Nichols tuned PID controller and static fuzzy PID controllers currently in use.