Method and a process control system using the method for minimizing hunting

摘要: A method for process control to minimize hunting using a controller wherein PID arithmetic operation is performed with respect deviation of setting parameter and processed variable fed back from process, resultant manipulation applied the including steps monitoring waveforms obtain an oscillation period deviation, identifying characteristics obtaining phase angle frequency response open-loop transfer function system characteristics, detecting by magnitude angle. includes self-tuning having means performing between identification determining optimal parameters, obtained angle, tuning in accordance result detecting.