PROCESS QUANTITY CONTROLLER

Japanese Patent JPS60205701

A

PURPOSE:To accelerate stabilization of a control system by discriminating whether the control system is in the hunting state or not and changing a constant of control operation where the deviation between a measured value and a set value is reduced to zero if the control system is in the hunting state. CONSTITUTION:It is discriminated whether the control system is in the stable state where the absolute value of the deviation between the measured value and the set value is held within a prescribed value for a certain period or in the unstable state where said absolute value is not held there; and if the control system is in the unstable state, it is discrimination whether the control system is in the hunting state or not. In the hunting discriminating operation, an initial value is set to a hunting counting counter at a time t2, when the polarity of a deviation signal is first inverted, after the start of the control operation, and simultaneously, a time T2 which is the period of the hunting discrimination operation is set to a discriminating timer. The value of the counting counter is decreased at each of times t3-t5 when the polarity of the deviation signal is inverted, and the hunting state is discriminated if the value of the counting counter becomes zero in the period T2, and a proportional operation constant is reduced. Hereafter, this detecting operation is repeated until the control system is in the stable state.

KUROKI HISASHI
ONIMURA KUNIHARU

JP6418584A

October 17, 1985

March 30, 1984

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YOKOGAWA HOKUSHIN ELECTRIC

G05B5/01; G05B5/00; G05B13/00; G05B13/02; (IPC1-7): G05B13/00

JPS58158303A

1983-09-20

Shinsuke Ozawa

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