US5029066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process control system
Assignee: Toshiba Corp
•
Filing: 1989-03-17
•
Granted: 1991-07-02
•
Expires: 2009-03-17
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 difference 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 from a choice of proportional, integral and differential 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 Hiroi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:11
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: 10
Claim 1
Independent Claim
252 words
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 comprising: difference computing means for computing a difference between the control amount value and the given target value; main control means for performing at least proportional and integral control operations from a choice of proportional, integral, and differential control operations on the computed difference between the control amount value and the given target value 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 a variation in the given target value, said compensation control means including discrimination means for determining whether a control constant of the differential 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 differential control operation is zero or non-zero.
Claim 2
Independent Claim
252 words
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 comprising: difference computing means for computing a difference between the control amount value and the given target value; main control means for performing at least proportional and integral control operations from a choice of proportional, integral, and differential control operations on the computed difference between the control amount value and the given target value 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 a variation in the given target value, said compensation control means including discrimination means for determining whether a control constant of the differential 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 differential control operation is zero or non-zero.
Claim 3
Dependent Claim
55 words
The system of claim 1, 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 differential control operation is zero or non-zero.
Claim 4
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 differential 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 differential control operation is zero or non-zero.
Claim 5
Dependent Claim
73 words
The system of claim 3, 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 coefficients based on said discriminating means determining whether said control constant of the differential control operation is zero or non-zero.
Claim 6
Independent Claim
216 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 from a choice of proportional, integral, and differential control operations on the computed difference between the control amount value and the given target value 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 performing a compensation control operation according to adjust the control constants to a second given state that corresponds to a variation in the given target value, the step of performing the compensation control operation including the step of determining whether a control constant of the differential 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 including the step of setting the given gain revision coefficient based on whether the control constant of the differential control operation is determined to be zero or non-zero.
Claim 7
Independent Claim
216 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 from a choice of proportional, integral, and differential control operations on the computed difference between the control amount value and the given target value 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 performing a compensation control operation according to adjust the control constants to a second given state that corresponds to a variation in the given target value, the step of performing the compensation control operation including the step of determining whether a control constant of the differential 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 including the step of setting the given gain revision coefficient based on whether the control constant of the differential control operation is determined to be zero or non-zero.
Claim 8
Dependent Claim
51 words
The method of claim 5, wherein the step of setting includes the substeps 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 differential control operation is determined to be zero or non-zero.
Claim 9
Dependent Claim
103 words
The method of claim 5, wherein the step of performing the compensation control operation includes the step of determining whether a control constant of the differential 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 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 differential control operation is determined to be zero or non-zero.
Claim 10
Dependent Claim
69 words
The method of claim 7, wherein the step of setting includes the substeps 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 differential control operation is determined to be zero or non-zero.
References Cited (Backward Citations)
US3644719A
Cited
US4052642A
Cited
US4139887A
Cited
US4563735A
Cited
US4500950A
Cited
US4679136A
Cited
US4755924A
Cited
JPS61198302A
Cited
JPS61290505A
Cited
US4882526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |