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US3862403A
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US
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Plant optimizing control device
Assignee: Hitachi Ltd
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Filing: 1974-04-16
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Granted: 1975-01-21
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Expires: 1994-04-16
Abstract
Abstract A plant optimizing control device in which a slight variation is caused in the input by applying a search signal to the input and the preset value of the input is adjusted on the basis of an optimizing signal so as to cause the operating point of the plant to give an optimum point by measuring the variation in the output corresponding to the variation in the input, the device comprising a first means for generating a periodical signal consisting of pseudo-random binary signals and serving as the search signal, a second means for obtaining a correlating signal with respect to the input and output of the plant, from a running mean within a period of the signal of the first means, the running mean being made in accordance with the expected plant characteristic; a third means for detecting the output of the plant, estimating from the detected value a dc component corresponding to the optimizing signal and obtaining a signal corresponding to the search signal which is equivalent to the detected value minus the dc component; a fourth means for obtaining from the outputs of the second and the third means the gradient of the variation in the output of the plant; and a fifth means for obtaining the optimizing signal of the plant from the fourth means.
Inventors
- 👤 Nobuo Kurihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:29
CPC Classifications
F; F22; F22B; F22B35/00; F22B35/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
219 words
A plant optimizing control device in which a slight variation is caused in the input by applying a search signal to the input and the preset value of the input is adjusted on the basis of an optimizing signal so as to cause the operating point of the plant to give an optimum point by measuring the variation in the output corresponding to the variation in the input, the device comprising a first means for generating a periodical signal consisting of pseudo-random binary signals and serving as the search signal; a second means for obtaining a correlating signal with respect to the input and output of the plant, from a running mean within a period of the signal of the first means, the running mean being made in accordance with the expected plant characteristic; a third means for detecting the output of the plant, estimating from the detected value a dc component corresponding to the optimizing signal And obtaining a signal corresponding to the search signal which is equivalent to the detected value minus the dc component; a fourth means for obtaining from the outputs of the second and the third means the gradient of the variation in the output of the plant; and a fifth means for obtaining the optimizing signal of the plant from the forth means.
Claim 2
Dependent Claim
219 words
A plant optimizing control device in which a slight variation is caused in the input by applying a search signal to the input and the preset value of the input is adjusted on the basis of an optimizing signal so as to cause the operating point of the plant to give an optimum point by measuring the variation in the output corresponding to the variation in the input, the device comprising a first means for generating a periodical signal consisting of pseudo-random binary signals and serving as the search signal; a second means for obtaining a correlating signal with respect to the input and output of the plant, from a running mean within a period of the signal of the first means, the running mean being made in accordance with the expected plant characteristic; a third means for detecting the output of the plant, estimating from the detected value a dc component corresponding to the optimizing signal And obtaining a signal corresponding to the search signal which is equivalent to the detected value minus the dc component; a fourth means for obtaining from the outputs of the second and the third means the gradient of the variation in the output of the plant; and a fifth means for obtaining the optimizing signal of the plant from the forth means.
Claim 3
Dependent Claim
73 words
A plant optimizing control device as claimed in claim 1, wherein the first means comprises a first n-bit shift register, a second (2n - (n + 1)) -bit shift register connected in series with the first shift register, and an arithmetic operating circuit which logically operates the values of the n-th bit and an arbitrary bit of the first shift register and feeds the logically operated result back to the first shift register.
Claim 4
Dependent Claim
57 words
A plant optimizing control device as claimed in claim 2, wherein the correlation signal obtained by the second means is the difference between a first running mean obtained from the arbitrary bits of the first and the second shift registers and a second running mean obtained from other bits of the first and the second shift registers.
Claim 5
Dependent Claim
94 words
A plant optimizing control device as claimed in claim 1, wherein the dc component estimated by the third means is calculated from the initial value and the gradient of a straight line connecting a plurality of integrated values of the output of the plant in such a manner that the sum of the squares of the deviations of the integrated values from the straight line is minimized, the integrated values of the output of the plant being stored time-sequentially at a predetermined period in a memory means consisting of a plurality of memory units.
Claim 6
Dependent Claim
94 words
A plant optimizing control device as claimed in claim 1, wherein the fifth means is further provided with a sixth means which judges whether the variance of the output of the fourth means is less than the preset value or not, which delivers the output of the fourth means as it is when the output is less than the preset value and which delivers that output of the fourth means which had been delivered by the fourth means before the output exceeded the preset value, when the output is greater than the preset value.
Claim 7
Dependent Claim
165 words
A plant optimizing control device as claimed in claim 5, wherein the sixth means comprising a memory means consisting of a plurality of memory units which store the integrated values of the output of the fourth means time-sequentially at a predetermined period; an averaging means for obtaining the mean value of the contents of the memory means; an adding means for calculating the sum of the squares of the deviations of the content of the memory means from the mean value; a comparing means for comparing the output of the adding means with the preset value and delivering an output when the output of the adding means is less than the preset value; and a means which delivers the output of the fourth means as it is when there is an output of the comparing means and which delivers the output of the fourth means produced before the cease of the output of the comparing means when there is no output of the comparing means.
Claim 8
Dependent Claim
44 words
A plant optimizing control device as claimed in claim 1, wherein the fourth means comprises a multiplying means for calculating the product of the outputs of the second and the third means and an integrating means for integrating the output of the multiplying means.
Claim 9
Dependent Claim
99 words
A plant optimizing control device as claimed in claim 7, wherein the fourth means is further provided with a pulse generating means for generating a pulse signal whose period is in synchronism with that of the search signal generated by the first means; an operation stopping means for receiving the pulse signal and stopping the operation of the multiplying means every other period of the search signal; and a switching means for receiving the pulse signal and applying the output of the integrating means to the fifth means during the period in which the multiplying means is at operatiOn.
References Cited (Backward Citations)
US3343991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |