US3601984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature rate control system
Assignee: General Electric Co
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Filing: 1969-10-27
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Granted: 1971-08-31
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Expires: 1989-10-27
Abstract
Abstract A temperature rate control system for a gas turbine having sensors in the path of the exhaust gasses which produce an electrical signal proportional to temperature. A reference circuit provides a signal proportional to maximum allowable temperature which opposes the feedback signal at a summing junction. A third signal applied to the summing junction in opposition to the reference signal and varying toward zero as a function of time results in the summing junction output signal which varies the turbine fuel input inversely whereby the temperature increase rate of the turbine is held to a predetermined value.
Inventors
- 👤 Richard K Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:59
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/28; F05; F05D; F05D2270/00; F05D2270/01; F05D2270/11; F05D2270/112; F05D2270/30; F05D2270/303; F05D2270/3032
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A gas turbine fuel control system including means for producing a control signal operable to control the temperature increase rate of the turbine comprising: a. first circuit means for producing a feedback signal proportional to turbine exhaust gas temperature; b. second circuit means for providing a limit signal representative of the maximum allowable exhaust gas temperature; c. means to govern the rate of rise of exhaust gas temperature including third circuit means operable to generate a time varying reference signal; and d. means to sum said feedback, limit and reference signals and to produce a control signal representative of permissible turbine temperature.
Claim 2
Dependent Claim
102 words
A gas turbine fuel control system including means for producing a control signal operable to control the temperature increase rate of the turbine comprising: a. first circuit means for producing a feedback signal proportional to turbine exhaust gas temperature; b. second circuit means for providing a limit signal representative of the maximum allowable exhaust gas temperature; c. means to govern the rate of rise of exhaust gas temperature including third circuit means operable to generate a time varying reference signal; and d. means to sum said feedback, limit and reference signals and to produce a control signal representative of permissible turbine temperature.
Claim 3
Dependent Claim
27 words
The invention in accordance with claim 1 in which the time varying reference signal varies linearly with respect to time from a predetermined maximum value towards zero.
Claim 4
Dependent Claim
28 words
The invention in accordance with claim 1 including means to vary the maximum value of said reference signal without varying the rate at which said reference signal varies.
Claim 5
Dependent Claim
29 words
The invention in accordance with claim 1 including additional means to change the rate at which said reference signal varies independently without changing the maximum value of said signal.
Claim 6
Dependent Claim
40 words
The invention in accordance with claim 4 in which said additional means comprises a series arrangement including a capacitor, a semiconductor device and a plurality of resistors and further including means to selectively render a portion of said resistors ineffective.
References Cited (Backward Citations)
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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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |