US3987394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operational circuitry for gas turbine engine control
Assignee: Nissan Motor Co Ltd
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Filing: 1974-11-22
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Granted: 1976-10-19
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Expires: 1994-11-22
Abstract
Abstract A mathematical expression is converted and approximations applied to remove complex processes, simplifying the circuitry of system which controls compressor speed in dependence on ambient temperature.
Inventors
- 👤 Takane Itoh
- 👤 Takao Kamide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:24
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
An electrical operational circuitry of a gas turbine engine control capable of modifying a first signal indicative of an actual compressor rotor shaft speed in accordance with engine ambient temperature, which comprises: first means for sensing said engine ambient temperature to generate a first signal commensurate therewith; second means for receiving said first signal to amplify it by a factor of N ggm /2T sd and generate a second signal commensurate therewith, where N ggm is a median value of the available range of compressor rotor shaft speed and T sd is a standard average engine ambient temperature in degrees absolute; third means for sensing said actual compressor rotor shaft speed to generate a third signal commensurate therewith; fourth means for generating a fourth signal representing N ggm t sd /2T sd , where t sd is a standard average engine ambient temperature in degrees Celsius; fifth means for receiving said third and fourth signals and summing them to generate a fifth signal proportional to the sum of said third and fourth signals; and sixth means for receiving said second and fifth signals and subtracting the former from the latter to generate a sixth signal commensurate with the difference therebetween.
Claim 2
Dependent Claim
200 words
An electrical operational circuitry of a gas turbine engine control capable of modifying a first signal indicative of an actual compressor rotor shaft speed in accordance with engine ambient temperature, which comprises: first means for sensing said engine ambient temperature to generate a first signal commensurate therewith; second means for receiving said first signal to amplify it by a factor of N ggm /2T sd and generate a second signal commensurate therewith, where N ggm is a median value of the available range of compressor rotor shaft speed and T sd is a standard average engine ambient temperature in degrees absolute; third means for sensing said actual compressor rotor shaft speed to generate a third signal commensurate therewith; fourth means for generating a fourth signal representing N ggm t sd /2T sd , where t sd is a standard average engine ambient temperature in degrees Celsius; fifth means for receiving said third and fourth signals and summing them to generate a fifth signal proportional to the sum of said third and fourth signals; and sixth means for receiving said second and fifth signals and subtracting the former from the latter to generate a sixth signal commensurate with the difference therebetween.
References Cited (Backward Citations)
US3813946A
Cited
US3782205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |