US3701889A
Expired / Lapsed
US
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Variable-structure automatic control system
Assignee: Adaptronics Inc
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Filing: 1970-06-25
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Granted: 1972-10-31
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Expires: 1990-06-25
Abstract
Abstract This disclosure relates to a variable-structure automatic control system of improved design wherein a measure of the instantaneous distance between the actual system operating point in a phase space, defined in terms of control error and its derivatives, and the desired equilibrium point in said space is determined and employed to adjust the controller gain.
Inventors
- 👤 Roger L Barron
- 👤 Dixon Cleveland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:45
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/0205
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
118 words
In an automatic controller for a controlled plant having an input command, a feedback signal indicative of the measured state of the controlled plant, combining means by which said input command and said feedback signal produce a signal indicative of controlled plant response error, and actuation means by which the output of the automatic controller is connected to and actuates said plant, a variable-structure controller which comprises first means to determine the distance in a phase space of said control error and at least one of its derivatives from the instantaneous system operating point and the desired final equilibrium point and second means responsive to said determination of said distance for altering the signal to said actuation means.
Claim 2
Dependent Claim
118 words
In an automatic controller for a controlled plant having an input command, a feedback signal indicative of the measured state of the controlled plant, combining means by which said input command and said feedback signal produce a signal indicative of controlled plant response error, and actuation means by which the output of the automatic controller is connected to and actuates said plant, a variable-structure controller which comprises first means to determine the distance in a phase space of said control error and at least one of its derivatives from the instantaneous system operating point and the desired final equilibrium point and second means responsive to said determination of said distance for altering the signal to said actuation means.
Claim 3
Dependent Claim
79 words
In an automatic controller as set forth in claim 1, said controller having at least one switching function in said phase space, third means for determining a function of the distance in said phase space from the instantaneous system operating point to at least one of said switching functions and fourth Means responsive to said third means for determining the distance to said switching functions for altering the signal to said actuation means in conjunction with said second means.
Claim 4
Dependent Claim
54 words
In an automatic controller as set forth in claim 1, wherein said plant, including said actuation means, includes fifth means for measuring intermediate response variables indicative of the state of said plant, and sixth means responsive to said fifth means for altering the signal to said actuation means in conjunction with said second means.
Claim 5
Dependent Claim
56 words
In an automatic controller as set forth in claim 2, wherein said plant, including said actuation means, includes fifth means for measuring intermediate response variables indicative of the state of said plant, and sixth means responsive to said fifth means for altering the signal to said actuation means in conjunction with said second and fourth means.
Claim 6
Dependent Claim
79 words
In an automatic controller as set forth in claim 1, said controller having at least one phase space switching function associated therewith, third means for determining a function of the distance in said phase space from the instantaneous system operating point to at least one of said switching functions and fourth means responsive to said third means for determining the distance to said switching functions for altering the signal to said actuation means in conjunction with said second means.
Claim 7
Dependent Claim
56 words
In an automatic controller as set forth in claim 5, wherein said plant, including said actuation means, includes fifth means for measuring intermediate response variables indicative of the state of said plant, and sixth means responsive to said fifth means for altering the signal to said actuation means in conjunction with said second and fourth means.
Claim 8
Dependent Claim
68 words
An automatic controller as set forth in claim 1 wherein said first means includes a seventh squaring means for squaring said signal indicative of plant response error, eighth means for squaring the derivative of said signal indicative of plant response error, ninth means for combining the outputs of said seventh and eighth means, and tenth means for taking the square root of the output of said ninth means.
Claim 9
Dependent Claim
68 words
An automatic controlled as set forth in claim 2, wherein said first means includes a seventh squaring means for squaring said signal indicative of plant response error, eighth means for squaring the derivatives of said signal indicative of plant response error, ninth means for combining the outputs of said seventh and eighth means, and tenth means for taking the square root of the output of said ninth means.
Claim 10
Dependent Claim
68 words
An automatic controller as set forth in claim 3 wherein said first means includes a seventh squaring means for squaring said signal indicative of plant response error, eighth means for squaring the derivative of said signal indicative of plant response error, ninth means for combining the outputs of said seventh and eighth means, and tenth means for taking the square root of the output of said ninth means.
Claim 11
Dependent Claim
68 words
An automatic controller as set forth in claim 4 wherein said first means includes a seventh squaring means for squaring said signal indicative of plant response error, eighth means for squaring the derivative of said signal indicative of plant response error, ninth means for combining the outputs of said seventh and eighth means, and tenth means for taking the square root of the output of said ninth means.
Claim 12
Dependent Claim
68 words
An automatic controller as set forth in claim 5 wherein said first means includes a seventh squaring means for squaring said signal indicative of plant response error, eighth means for squaring the derivative of said signal indicative of plant response error, ninth means for combining the outputs of said seventh and eighth means, and tenth means for taking the square root of the output of said ninth means.
Claim 13
Dependent Claim
68 words
An automatic controller as set forth in claim 6 wherein said first means includes a seventh squaring means for squaring said signal indicative of plant response error, eighth means for squaring the derIvative of said signal indicative of plant response error, ninth means for combining the outputs of said seventh and eighth means, and tenth means for taking the square root of the output of said ninth means.
Claim 14
Dependent Claim
61 words
An automatic controller as set forth in claim 1 wherein said first means includes an eleventh means for providing the absolute value of said signal indicative of plant response error, twelfth means for providing the absolute value of the derivative of said signal indicative of plant response error and thirteenth means for combining the outputs of said eleventh and twelfth means.
Claim 15
Dependent Claim
61 words
An automatic controller as set forth in claim 2 wherein said first means includes an eleventh means for providing the absolute value of said signal indicative of plant response error, twelfth means for providing the absolute value of the derivative of said signal indicative of plant response error and thirteenth means for combining the outputs of said eleventh and twelfth means.
Claim 16
Dependent Claim
61 words
An automatic controller as set forth in claim 3 wherein said first means includes an eleventh means for providing the absolute value of said signal indicative of plant response error, twelfth means for providing the absolute value of the derivative of said signal indicative of plant response error and thirteenth means for combining the outputs of said eleventh and twelfth means.
Claim 17
Dependent Claim
61 words
An automatic controller as set forth in claim 4 wherein said first means includes an eleventh means for providing the absolute value of said signal indicative of plant response error, twelfth means for providing the absolute value of the derivative of said signal indicative of plant response error and thirteenth means for combining the outputs of said eleventh and twelfth means.
Claim 18
Dependent Claim
61 words
An automatic controller as set forth in claim 5 wherein said first means includes an eleventh means for providing the absolute value of said signal indicative of plant response error, twelfth means for providing the absolute value of the derivative of said signal indicative of plant response error and thirteenth means for combining the outputs of said eleventh and twelfth means.
Claim 19
Dependent Claim
61 words
An automatic controller as set forth in claim 6 wherein said first means includes an eleventh means for providing the absolute value of said signal indicative of plant response error, twelfth means for providing the absolute value of the derivative of said signal indicative of plant response error and thirteenth means for combining the outputs of said eleventh and twelfth means.
References Cited (Backward Citations)
US3225179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |