A fuzzy logic based PI autotuner

摘要

An autotuner based on PI algorithm starting with deadbeat approach and prediction made with fuzzyinference mechanism has been presented. While fuzzy inferencing in PI mode has been of someconsequence in recent years, addition of the deadbeat format is expected to improve the performanceminimizing IAE through reduction of the number of command variation. Because of the requirementof controller gain and reset time beyond the acceptance limits with a deadbeat format, constraintsfollowing a knowledge base and compatible with the system using fuzzy inference engine have beenimposed. The simulated as well as practical results with table top process models have shownsubstantial improvement in the performance of the system as compared with the Ziegler-Nichol'sapproach.