US4218733A
Expired / Lapsed
US
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Adaptive gain controller
Assignee: ABB Instrumentation Inc
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Filing: 1978-11-13
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Granted: 1980-08-19
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Expires: 1998-11-13
Abstract
Abstract A controller for process control has an adaptive gain. The controller is used as part of a closed feedback loop, and will, in response to different variables, maintain a constant loop gain regardless of non-linearities in the system. Signals representing the variables are transformed into corresponding active gain factors. The active gain of the controller is computed as a function of the product of the active gain factors and then translated to an output signal. One or more active gain factor is defined as having a first gain factor, at least one breakpoint, and a second gain factor. If two breakpoints are used, a base gain is interposed. Furthermore, one or more variables may have a step function as an active gain factor.
Inventors
- 👤 Stephen A. Maselli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:35
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/0205
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A controller for closed loop control of a process, said controller having the ability to change its active gain to compensate for process non-linearity so as to maintain a substantially constant closed loop gain, and being comprised of: a plurality of inputs for receiving signals representing variables; computing means for transforming said signals into corresponding active gain factors and for computing the active gain of the controller as a function of the product fo the active gain factors; and means for translating the calculated active gain to an output signal; wherein at least one of said variables has a corresponding active gain factor defined by a first corresponding gain factor, a breakpoint, and a second corresponding gain factor.
Claim 2
Dependent Claim
118 words
A controller for closed loop control of a process, said controller having the ability to change its active gain to compensate for process non-linearity so as to maintain a substantially constant closed loop gain, and being comprised of: a plurality of inputs for receiving signals representing variables; computing means for transforming said signals into corresponding active gain factors and for computing the active gain of the controller as a function of the product fo the active gain factors; and means for translating the calculated active gain to an output signal; wherein at least one of said variables has a corresponding active gain factor defined by a first corresponding gain factor, a breakpoint, and a second corresponding gain factor.
Claim 3
Dependent Claim
39 words
The controller of claim 1 wherein said corresponding active gain factor is further defined by said first corresponding gain factor, said breakpoint, a second breakpoint, a corresponding base gain interposed between said breakpoints, and said second corresponding gain factor.
Claim 4
Dependent Claim
54 words
The controller of claim 1 wherein each of a first set of said variables has a corresponding active gain factor defined by a first corresponding gain factor, a breakpoint and a second corresponding gain factor and each of a second set of variables has a corresponding active gain factor characterized as a step function.
Claim 5
Dependent Claim
28 words
The controller of claim 3 wherein the first set of variables represent process, deviation and remote input and the second set of variables represent output and external contact.
Claim 6
Dependent Claim
65 words
The controller of claim 1 wherein each of a first set of variables has a corresponding active gain factor defined by a first corresponding gain factor, a first breakpoint, a second breakpoint, a corresponding base gain interposed between said breakpoints, and a second correspondinng gain factor and each of a second set of variables has a corresponding active gain factor characterized as a step function.
Claim 7
Dependent Claim
29 words
The controller of claim 5 wherein the first set of variables represent process, deviation, and remote input and the second set of variables represent controller output and external contact.
Claim 8
Dependent Claim
22 words
The controller of claims 4 or 6 wherein one variable in the first set is used for both process and remote output.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |