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The advent of relay auto-tuning of PID controllers got rid of previous troublesome tuning procedure. However, PID control performance didn't change so much since the tuning rule was the same as the Ziegler and Nichols that only use ultimate gain and ultimate period. In this paper, we propose new tuning rule especially for an unsymmetrical process. The experimental test result showed proposed rule...
Combination of proportional-integral-derivative (PID) control and modern control theory such as observer can control more difficult application than PID control only. We proposed combined control technique of PID control and disturbance observer for the temperature control of deionized (DI) water heater that is used for semiconductor processing equipment. The result of both simulation and actual equipment...
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