Patent US3790765A successfully refreshed from Google Patents.
US3790765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Governor with integrator reset
Assignee: Colt Industries Operating Corp
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Filing: 1973-02-01
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Granted: 1974-02-05
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Expires: 1993-02-01
Abstract
Abstract A control system employing, in one of a plurality of control loops, an isochronous governor and means for controlling the output of the integrator of the governor as a function of the control signal selected by the system logic. During closed loop control under command of the isochronous governor the integrator operates normally whereas during isochronous governor open loop operation the integrator is operated closed loop on the selected control system output.
Inventors
- 👤 T Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:18
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/28; F05; F05D; F05D2200/00; F05D2200/10; F05D2200/15
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
249 words
In a plant control system, said system including a plurality of control loops for generating control signals commensurate with different plant variable operating parameters and means for selecting one of said control signals for control purposes, one of said control loops including means for integrating a signal commensurate with a first control variable error, the improvement comprising: switch means having at least a pair of input connections; means for delivering said first control variable error signal to a first input connection of said switch means; means for deliVering signals passed by said switch means to the input of the integrating means in said one control loop; means generating a signal commensurate with the difference between the output of the integrating means in said one control loop and the selected control signal; means connecting the output of said difference signal generating means to a second input connection of said switch means; and switch means control signal generating means responsive to the selected control signal and the control signal provided by said one of said control loops, said switch means control signal generating means providing output signals indicative of whether output of said one of said control loops has been selected for control purposes whereby said switch means will pass the signal commensurate with first control variable error when the output of said one control loop is selected and said switch means will pass the output of said difference signal generating means when the output of another control loop is selected.
Claim 2
Dependent Claim
249 words
In a plant control system, said system including a plurality of control loops for generating control signals commensurate with different plant variable operating parameters and means for selecting one of said control signals for control purposes, one of said control loops including means for integrating a signal commensurate with a first control variable error, the improvement comprising: switch means having at least a pair of input connections; means for delivering said first control variable error signal to a first input connection of said switch means; means for deliVering signals passed by said switch means to the input of the integrating means in said one control loop; means generating a signal commensurate with the difference between the output of the integrating means in said one control loop and the selected control signal; means connecting the output of said difference signal generating means to a second input connection of said switch means; and switch means control signal generating means responsive to the selected control signal and the control signal provided by said one of said control loops, said switch means control signal generating means providing output signals indicative of whether output of said one of said control loops has been selected for control purposes whereby said switch means will pass the signal commensurate with first control variable error when the output of said one control loop is selected and said switch means will pass the output of said difference signal generating means when the output of another control loop is selected.
Claim 3
Dependent Claim
84 words
The apparatus of claim 1 wherein said switch means control signal generating means comprises: first comparator means, said first comparator means having a first input connected to receive the control system output signal and a second input connected to receive from said one of said control loops a signal commensurate with the requisite control system reaction as a function of the first control variable error; and means connected to said first comparator means and responsive to signals provided thereby for producing switching command signals.
Claim 4
Dependent Claim
51 words
The apparatus of claim 1 wherein said difference signal generating means comprises: comparator means connected to receive the output of the integrating means in said one control loop as a first input signal and to receive as a second input a signal commensurate with the control signal selected by the system.
Claim 5
Dependent Claim
52 words
The apparatus of claim 2 wherein said difference signal generating means comprises: second comparator means connected to receive the output of the integrating means in said one control loop as a first input signal and to receive as a second input a signal commensurate with the control signal selected by the system.
Claim 6
Dependent Claim
71 words
The apparatus of claim 2 wherein said switching command signal producing means comprises: dead band signal generating means responsive to the output of said first comparator means for providing a signal having a polarity indicative of the results of the comparison formed by said first comparator means; and bistable means connected to said dead band signal generating means and responsive to output signals provided thereby for generating switch means control signals.
Claim 7
Dependent Claim
94 words
The apparatus of claim 4 wherein said switching command signal producing means comprises: dead band signal generating means responsive to the output of said first comparator means for providing a signal having a polarity indicative of the results of the comparison formed by said first comparator means; and bistable means connected to said dead band signal generating means and responsive to output signals provided thereby for generating switch means control signals. signal, said function generator means producing an inversion of the function generated by the output function generator in said one control loop; and
Claim 8
Dependent Claim
56 words
The apparatus of claim 2 wherein said one of said control loops includes an output function generator and wherein said first comparator means comprises: function generator means for receiving the selected system control summing circuit means receiving the output of said function generator means and the input to the said one control loop out-put function generator.
Claim 9
Dependent Claim
120 words
The apparatus of claim 7 wherein said difference signal generating means comprises: second comparator means connected to receive the output of the integrating means in said one control loop as a first input signal and to receive as a second input the output of said function generator means. 9. The apparatus of claim 8 wherein said switching command signal producing means comprises: dead band signal generating means responsive to the output of said summing circuit means for providing a signal having a polarity indicative of the results of the comparison formed by said summing circuit means; and bistable means connected to said dead band signal generating means and responsive to output signals provided thereby for generating switch means control signals.
References Cited (Backward Citations)
US3520133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |