US3584208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controller
Assignee: George W Dahl Co Inc
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Filing: 1970-01-28
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Granted: 1971-06-08
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Expires: 1990-01-28
Abstract
Abstract A controller which is adapted to accept two input signals and produce a third signal which is applied as the analog of the rate of change of a fourth variable affecting one of the input signals.
Inventors
- 👤 Richard S Slawson
- 👤 Theodore C Hamlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:53
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/36; G05B11/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A controller adapted to accept two input signals, r and x, and produce an output m, comprising first means modifying the signal x to produce a first signal which can be expressed by the function x + K3dx/dt where K3 time constant of said means second means responsive to the signal rand subtracting the first signal from the signal r to generate a second signal which can be expressed by r-x-K3dx/dt, third means modifying the second signal to produce a third signal which can be expressed by the function where K2 time constant of said third means said function representing the analog of the rate of change of the controller output, fourth means for multiplying the third signal by a factor K1 and including an integrating element for time integrating the product thereof to produce an output m.
Claim 2
Dependent Claim
138 words
A controller adapted to accept two input signals, r and x, and produce an output m, comprising first means modifying the signal x to produce a first signal which can be expressed by the function x + K3dx/dt where K3 time constant of said means second means responsive to the signal rand subtracting the first signal from the signal r to generate a second signal which can be expressed by r-x-K3dx/dt, third means modifying the second signal to produce a third signal which can be expressed by the function where K2 time constant of said third means said function representing the analog of the rate of change of the controller output, fourth means for multiplying the third signal by a factor K1 and including an integrating element for time integrating the product thereof to produce an output m.
Claim 3
Dependent Claim
18 words
A controller as in claim 1 wherein means for realizing the factor K1 includes a periodic waveform source.
Claim 4
Dependent Claim
78 words
A controller as in claim 1 utilizing external means expressed by the transfer function G1(s)G2(s) for coupling the output m to signal x whereby the signal x is affected in a manner to ultimately bring the signal x into agreement with the signal r, said external means including a coupling between the process variable c and the output mdefined by the transfer function G1(s) whereby the process variable c is brought into effective agreement with the signal r.
Claim 5
Dependent Claim
46 words
A controller as in claim 2 wherein the output waveform of said periodic waveform source is adjustable as to both frequency and shape whereby not only is the value of K1 adjusted, but also the reset rate is transformed into a function of the third signal.
References Cited (Backward Citations)
US294643A
Cited
US3377547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |