EP0333477A2
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EP
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Process control system
Assignee: Toshiba Corp
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Filing: 1989-03-16
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Granted: —
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Expires: 2009-03-16
Abstract
Abstract A system for controlling a process system subject to an external disturbance by adjusting a value of a control amount outputted by the process system to a given target value. The system includes a different computing unit for computing a difference between the control amount value and the given target value, a main control unit for performing at least proportional and integral control operations out of proportional, integral and derivative control operations based on control constants including proportional gain, integration time, and derivation time adjusted to a first given state that suppresses fluctuation of the control amount produced by external disturbance, and a compensation control unit for performing a compensation control operation to equivalently adjust the control constants of the main control unit to second given state that tracks target value variation.
Inventors
- 👤 Kazuo C/O Patent Division Hiroi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 18:42
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B11/00; G05B11/01; G05B11/36; G05B11/42; G05B13/00; G05B13/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A system for controlling a process system subject to an external disturbance by adjusting the value of a control output from the process system to a given target value, the system comprising: difference computing means for computing a difference between the control output value and the given target value; main control means for performing at least proportional and integral control operations out of proportional, integral, and derivative control operations based on control constants including proportional gain, integration time, and derivation time adjusted to a first given state that suppresses fluctuation of the control amount produced by the external disturbance; and compensation control means for performing a compensation control operation according to a given revision coefficient to adjust the control constants of the main control means to a second given state that corresponds to the target value variation.
Claim 2
Independent Claim
137 words
A system for controlling a process system subject to an external disturbance by adjusting the value of a control output from the process system to a given target value, the system comprising: difference computing means for computing a difference between the control output value and the given target value; main control means for performing at least proportional and integral control operations out of proportional, integral, and derivative control operations based on control constants including proportional gain, integration time, and derivation time adjusted to a first given state that suppresses fluctuation of the control amount produced by the external disturbance; and compensation control means for performing a compensation control operation according to a given revision coefficient to adjust the control constants of the main control means to a second given state that corresponds to the target value variation.
Claim 3
Dependent Claim
103 words
The system of claim 1, wherein said compensation control means includes discrimination means for determining whether a control constant of the derivative control operation is zero or non-zero, main compensation control means for performing said compensation control operation in accordance with a given gain revision coefficient to equivalently adjust the control constants of the main control means to second given states that correspond to target value variations, and parameter setting means for setting the given gain revision coefficient in the main compensation control means based on said discrimination means determining whether said control constant of the derivative control operation is zero or non-zero.
Claim 4
Dependent Claim
55 words
The system of claim 2, wherein said parameter setting means includes means for setting a plurality of given gain revision coefficients, and changeover switch means for selecting one of the plurality of given gain revision coefficients based on said discrimination means determining whether said control constant of the derivative control operation is zero or non-zero.
Claim 5
Dependent Claim
117 words
The system of claim 1, wherein said compensation control means includes discrimination means for determining whether a control constant of the derivative control operation is zero or non-zero, main compensation control means for performing said compensation control operation in accordance with a given gain revision coefficient and a given integration time revision coefficient to equivalently adjust the control constants of the main control means to third given states that correspond to target value variations, and parameter setting means for setting the given gain revision coefficient and the given integration time revision coefficient in said main compensation control means based on said discriminating means determining whether said control constant of the derivative control operation is zero or non-zero.
Claim 6
Dependent Claim
72 words
The system of claim 4, wherein said parameter setting means includes means for setting a plurality of given gain revision coefficients and a plurality of given integration time coefficients, and changeover switch means for selecting one of the plurality of given gain revision coefficients and one of the plurality of given gain revision based on said discriminating means determining whether said control constant of the derivative control operation is zero or non-zero.
Claim 7
Independent Claim
116 words
A method of controlling a process system subject to an external disturbance by adjusting a value of a control amount outputted by the process system to a given target value comprising the steps of: computing a difference between the control amount value and the given target value; performing at least proportional and integral control operations out of proportional, integral and derivative control operation based on control constants including proportional gain, integration time, and derivation time adjusted to a first given stare that suppresses fluctuations of the control amount produced by the external disturbance; and performing a compensation control operation to adjust the control constants to a second given state that corresponds to the target value variation.
Claim 8
Independent Claim
116 words
A method of controlling a process system subject to an external disturbance by adjusting a value of a control amount outputted by the process system to a given target value comprising the steps of: computing a difference between the control amount value and the given target value; performing at least proportional and integral control operations out of proportional, integral and derivative control operation based on control constants including proportional gain, integration time, and derivation time adjusted to a first given stare that suppresses fluctuations of the control amount produced by the external disturbance; and performing a compensation control operation to adjust the control constants to a second given state that corresponds to the target value variation.
Claim 9
Dependent Claim
86 words
The method of claim 6, wherein the step of performing the compensation control operation includes the step of determining whether a control constant of the derivative control operation is zero or non-zero and the step of performing the compensation control operation to adjust the control constants to a second given state that corresponds to the target value variations includes the step of setting the given gain revision coefficient based on whether the control constant of the derivative control operation is determined to be zero or non-zero.
Claim 10
Dependent Claim
51 words
The method of claim 7, wherein the step of setting includes the sub-steps of setting a plurality of given gain revision coefficients and selecting one of the plurality of given gain revision coefficients based on whether the control constant of the derivative control operation is determined to be zero or non-zero.
Claim 11
Dependent Claim
104 words
The method of claim 6, wherein the step of performing the compensation control operation includes the step of determining whether a control constant of the derivative control operation is zero or non-zero and, the step of performing the compensation control operation includes selecting a given gain revision coefficient and a given integration time revision coefficient to adjust the control constants to a third given state that corresponds to the target value variation and setting the given gain revision coefficient and the given integration time revision coefficient based on whether the control constant of the derivative control operation is determined to be zero or non-zero.
Claim 12
Dependent Claim
69 words
The method of claim 9, wherein the step of setting includes the sub-steps of setting a plurality of given gain revision coefficients and a plurality of given integration time coefficients, and selecting one of the plurality of given gain revision coefficients and one of the plurality of given gain revision coefficients based on whether the control constant of the derivative control operation is determined to be zero or non-zero.
References Cited (Backward Citations)
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