Hitachi, Ltd.

Eiji Tohyama

Susumu Takahashi

Hiroshi Matsumoto

Masahide Nomura

Tadayoshi Saito

Hisanori Miyagaki

Makoto Shimoda

Nobuyuki Yokokawa

Kohji Tachibana

A process control apparatus and a process control system for observing the waveform of the deviation between a set point which controls the process in a control loop and the process controlled variable transmitted from the process so that the operating parameters are adjusted in accordance with a predetermined adjustment rule by using the deviation based upon the absolute value of a wave for every half cycle of the wave. Therefore, even if the process controlled variable is influenced, the area of the wave cannot be changed significantly. As a result, the operating parameters can be adjusted correctly, causing the process controlled variable to quickly coincide with the set point.

Process control apparatus and method for adjustment of operating

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Ibaraki, Japan

Eiji Tohyama