US3644897A
Expired / Lapsed
US
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Automatic control point adjustment system and method
Assignee: Robertshaw Controls Co
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Filing: 1970-01-15
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Granted: 1972-02-22
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Expires: 1990-01-15
Abstract
Abstract A system and method for automatically adjusting a control point including input circuits receiving arbitrarily selected control point values in engineering units and addresses of controllers to be adjusted, a memory storing conversion data for the controllers corresponding to a reset range and a curve of positioning of the controllers versus control point values, a calculator receiving the conversion data and the selected control point value for a controller and calculating a required position for the controller to provide the selected control point value, and a comparator receiving the required position and the actual position of the controller and providing output signals to move the controller to the required position.
Inventors
- 👤 Alan F Mccrea
- 👤 Hugh V Snively
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:04
CPC Classifications
G; G05; G05B; G05B15/00; G05B15/02; G05D; G05D23/00; G05D23/19; G05D23/1917; G05D23/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
297 words
An automatic control point adjustment system comprising control means movable to adjust a control point value and having a specific curve of positioning thereof versus control point values, said control means having a first output providing feedback signals corresponding to the actual position of said control means; first input means for receiving data in engineering units corresponding to an arbitrarily selected control point value to be established at said control means and providing a second output representative of said selected control point value; second input means for receiving data corresponding to an address of said control means and providing a third output representative of said address; memory means storing conversion data corresponding to said curve of positioning of said control means versus control point values, said memory means receiving said third output from said second input means and providing a fourth output representative of said conversion data; calculating means receiving said second output from said first input means representative of said selected control point value and said fourth output from said memory means representative of said conversion data, said calculating means providing a fifth output representative of a required position of said control means to provide said selected control point value; and comparator means receiving said feedback signals from said first output of said control means corresponding to the actual position of said control means and said fifth output from said calculating means representing said required position for said control means, said comparator means having a sixth output connected with said control means to move said control means until said feedback signals from said first outpuT of said control means correspond to said fifth output from said calculating means whereby said control means is automatically moved to said required position to provide said selected control point value.
Claim 2
Dependent Claim
297 words
An automatic control point adjustment system comprising control means movable to adjust a control point value and having a specific curve of positioning thereof versus control point values, said control means having a first output providing feedback signals corresponding to the actual position of said control means; first input means for receiving data in engineering units corresponding to an arbitrarily selected control point value to be established at said control means and providing a second output representative of said selected control point value; second input means for receiving data corresponding to an address of said control means and providing a third output representative of said address; memory means storing conversion data corresponding to said curve of positioning of said control means versus control point values, said memory means receiving said third output from said second input means and providing a fourth output representative of said conversion data; calculating means receiving said second output from said first input means representative of said selected control point value and said fourth output from said memory means representative of said conversion data, said calculating means providing a fifth output representative of a required position of said control means to provide said selected control point value; and comparator means receiving said feedback signals from said first output of said control means corresponding to the actual position of said control means and said fifth output from said calculating means representing said required position for said control means, said comparator means having a sixth output connected with said control means to move said control means until said feedback signals from said first outpuT of said control means correspond to said fifth output from said calculating means whereby said control means is automatically moved to said required position to provide said selected control point value.
Claim 3
Dependent Claim
46 words
The invention as recited in claim 1 wherein said control means has a reset range, said conversion data stored by said memory means includes said reset range, and said fifth output from said calculating means represents said required position as a function of said reset range.
Claim 4
Dependent Claim
42 words
The invention as recited in claim 2 wherein said control means includes a potentiometer connected across a source of electrical potential and slider positionable on said potentiometer in accordance with the actual position of said control means to provide said feedback signals.
Claim 5
Dependent Claim
64 words
The invention as recited in claim 3 wherein said control means includes a normally open switch connected with said sixth output from said comparator means, and address decoding means receives said third output from said second input means representative of said address of said control means and has a seventh output controlling said switch to close said switch when said control means is addressed.
Claim 6
Dependent Claim
81 words
The invention as recited in claim 4 wherein said memory means has an eighth output representative of said reset range, and second comparator means receives said eighth output from said memory means and said second output from said first input means representative of said selected control point value, said second comparator means having a ninth output providing an inhibit signal to said address decoding means to open said switch when said selected control point value is not within said reset range.
Claim 7
Dependent Claim
64 words
The invention as recited in claim 5 wherein said control means includes an electric motor connected with said switch, and said sixth output from said first recited comparator means includes first means providing a positive potential to operate said motor in a first direction and second means providing a negative potential to operate said motor in a second direction opposite to said first direction.
Claim 8
Independent Claim
170 words
A method of automatically adjusting a control point comprising the steps of storing conversion data in a memory for a plurality of control means, said data including a curve of the position of the control means versus control point values in engineering units for each of said control means; addressing said memory to obtain said conversion data for a specific control means; arbitrarily providing a control point value in engineering units for said specific control means; supplying said arbitrarily provided control point value and said conversion data for said specific control means to a calculator; calculating with said calculator a required position for said specific control means to provide said arbitrarily provided control point value and providing an output signal corresponding to said required position; generating a feedback signal corresponding to the actual position of said specific control means; and comparing said output signal with said feedback signal and providing control signals corresponding to the difference therebetween to said control means to move said control means toward said required position.
Claim 9
Independent Claim
170 words
A method of automatically adjusting a control point comprising the steps of storing conversion data in a memory for a plurality of control means, said data including a curve of the position of the control means versus control point values in engineering units for each of said control means; addressing said memory to obtain said conversion data for a specific control means; arbitrarily providing a control point value in engineering units for said specific control means; supplying said arbitrarily provided control point value and said conversion data for said specific control means to a calculator; calculating with said calculator a required position for said specific control means to provide said arbitrarily provided control point value and providing an output signal corresponding to said required position; generating a feedback signal corresponding to the actual position of said specific control means; and comparing said output signal with said feedback signal and providing control signals corresponding to the difference therebetween to said control means to move said control means toward said required position.
Claim 10
Dependent Claim
50 words
The invention as recited in claim 7 wherein said step of storing conversion data includes storing a reset range for each of said control means, and said step of calculating said required position for said specific control means includes providing said output signal as a function of said reset range.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |