| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and device for suppressing the hunting of an operation signal since a large stress is partially imposed on the valve of control equipment due to the occurrence of the hunting of the operation signal, and there is any possibility that equipment failure is caused although apparent main controlled variable are stable. SOLUTION: An operation signal SU is outputted to control a plant 30 on the basis of a target value SR, and controlled variable SY being the output of the plant are fetched, and the plant 30 is feedback-controlled according to a deviation signal EY between the target value SR and the manipulated variable SY. When the vibration of the operation signal SU is detected, the parameter of a controller 20 is set to a predetermined value for attenuating the vibration. Furthermore, the vibration of the deviation signal EY is evaluated, and when it is decided that the vibration of either the operation signal SU or the deviation signal EY is not present, the parameter is reset to another predetermined value or the original value. Thus, it is possible to suppress the hunting of the operation signal, and to protect instrumentation equipment such as a valve. Thus, it is possible to improve the quality of a product manufactured by equipment to be controlled as a result. COPYRIGHT: (C)2004,JPO
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