Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1987-03-02
1989-08-08
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
318610, 364157, 364162, G01R 3500, G05B 1302, G05B 1142
Patent
active
048556742
ABSTRACT:
A method for process control to minimize hunting using a controller wherein a PID arithmetic operation is performed with respect to a deviation of a setting parameter and a processed variable fed back from a process, and a resultant manipulation variable is applied to the process including the steps of monitoring the waveforms of the setting parameter and the processed variable from the process to obtain an oscillation period of the deviation, identifying process characteristics of the process, obtaining a phase angle of a frequency response of an open-loop transfer function of a system from the oscillation period and the process characteristics, and detecting a hunting of the process by the magnitude of the phase angle. A process control system includes a self-tuning controller having a control means for performing a PID arithmetic operation with respect to a deviation between a setting parameter and a processed variable fed back from a process, process identification means for identifying process characteristics and determining optimal PID parameters, monitoring means for monitoring the waveforms of the setting parameter and the processed variable from the process to obtain an oscillation period of the deviation, means for obtaining a phase angle of a frequency response of an open-loop transfer function of the process obtained from the oscillation period and process characteristics, means for detecting a hunting of the process by the magnitude of the phase angle, and means for performing a tuning operation of the controller in accordance with the detecting result by the means for detecting.
REFERENCES:
patent: 4336594 (1982-06-01), Masuzawa et al.
patent: 4408148 (1983-10-01), Herzog
patent: 4466054 (1984-08-01), Shigemasa et al.
patent: 4580208 (1986-04-01), Sukimoto et al.
patent: 4603674 (1986-08-01), Tanaka
patent: 4675805 (1987-06-01), Freymann
patent: 4702210 (1987-10-01), Yasuoka et al.
patent: 4748953 (1988-06-01), Osuga et al.
Murate Tsuneo
Suzuki Shin
Halista Mitchell J.
Karlsen Ernest F.
Medved Albin
Yamatake-Honeywell Company Limited
LandOfFree
Method and a process control system using the method for minimiz does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and a process control system using the method for minimiz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and a process control system using the method for minimiz will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-908279