Iterative Tuning of PID Controller by Fuzzy Indirect Reasoning and a Modified Zigler-Nichols Method

퍼지 간접추론법과 수정형 지글러-니콜스법에 의한 비례-적분-미분 제어기의 점진적 동조

An iterative tuning technique is derived for PID controllers which are widely used in industries. The tuning algorithm is based upon a fuzzy indirect reasoning method and an iterative technique. The PID gains for the first tuning action are determined by a method which is modified from the Ziegler-Nichols step response method. The first PID gains are determined to obtain a control performance so close to a design performance that the following tuning process can be made effectively. The design paramaters are given as time-domain variables which human is familiar with. The results of simulation studies show that the proposed tuning method can produce an effective tuning for arbitrary design performances.