US4467640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engine power availability measurement
Assignee: Colt Industries Operating Corp
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Filing: 1982-05-26
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Granted: 1984-08-28
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Expires: 2002-05-26
Abstract
Abstract The power available from a gas turbine engine is accurately determined by correcting predicted torque and gas generator speed for variations from normal of engine performance. The correction function is adaptively updated on-line by comparing actual and predicted values of torque and speed, storing any differences and summing the stored differences with the predicted values during the determination of power available.
Inventors
- 👤 Terry Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:21
CPC Classifications
G; G01; G01L; G01L3/00; G01L3/24; B; B64; B64D; B64D31/00; F; F02; F02C; F02C9/00; F02D; F02D41/00; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F05; F05D; F05D2200/00; F05D2200/10; F05D2200/11
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A method of determining the power which may be produced by a gas turbine engine, the engine having a compressor and power turbine and being instrumented to provide signals commensurate with a pluraltiy of operating parameters and limits, the method comprising the steps of: determining the maximum permissible engine gas generator speed for the existing engine inlet conditions; correcting the maximum permissible gas generator speed for deviation in performance of the engine from a predetermined normal; employing the corrected maximum permissible speed to determine the maximum torque which can be produced for the existing inlet conditions; and comparing the determined torque with the engine torque limit to ascertain the maximum obtainable torque.
Claim 2
Independent Claim
112 words
A method of determining the power which may be produced by a gas turbine engine, the engine having a compressor and power turbine and being instrumented to provide signals commensurate with a pluraltiy of operating parameters and limits, the method comprising the steps of: determining the maximum permissible engine gas generator speed for the existing engine inlet conditions; correcting the maximum permissible gas generator speed for deviation in performance of the engine from a predetermined normal; employing the corrected maximum permissible speed to determine the maximum torque which can be produced for the existing inlet conditions; and comparing the determined torque with the engine torque limit to ascertain the maximum obtainable torque.
Claim 3
Dependent Claim
27 words
The method of claim 1 further comprising the step of: correcting the determined maximum producible torque for deviation in performance of the engine from a predetermined normal.
Claim 4
Dependent Claim
74 words
The method of claim 2 wherein the step of determining the maximum torque which may be produced comprises: determining from stored data a second correction factor which is a function of the engine inlet pressure and temperature; employing the second correction factor and both the actual inlet pressure and temperature to calculate a torque modifier; and using the torque modifier to adjust the determined maximum torque as a function of the engine inlet conditions.
Claim 5
Dependent Claim
115 words
The method of claim 3 wherein the step of correcting the determined maximum torque which may be produced is performed prior to using the torque modifier to adjust the determination and comprises: employing the actual values of inlet temperature and speed to calculate a speed address signal during a read-in mode; using the speed address to look up the predicted present torque from predetermined information; comparing the predicted present torque with the actual torque; recording any difference between the actual and predicted torques in a location identified by the speed address; and combining recorded torque difference information with predetermined torque information which are found at locations having the same speed addresses during a read-out mode.
Claim 6
Dependent Claim
81 words
The method of claim 1 wherein the step of determining the maximum permissible gas generator speed comprises: determining a first correction factor which is a function of the engine inlet pressure and temperature; employing the first correction factor and both the actual inlet temperature and a limiting value of engine temperature to calculate an engine temperature limit for the existing inlet conditions; and using the calculated temperature limit as an address to look up the maximum permissible speed from predetermined information.
Claim 7
Dependent Claim
126 words
The method of claim 5 wherein the step of correcting maximum permissible speed comprises: employing the first correction factor and the actual values of inlet and an engine gas temperature to calculate a corrected gas temperature for the existing engine operating conditions during a read-in mode; using the calculated temperature for the operating conditions as an address to look up the predicted present operating speed from the predetermined information during the read-in mode; comparing the predicted present operating speed with the actual speed; recording any difference between the actual and predicted speeds in a location identified by an engine gas temperature; and combining the recorded difference information with predetermined information which are found at locations having the same engine gas temperature addresses during a read-out mode.
Claim 8
Dependent Claim
27 words
The method of claim 6 further comprising the step of: correcting the determined maximum producible torque for deviation in performance of the engine from a predetermined normal.
Claim 9
Dependent Claim
74 words
The method of claim 7 wherein the step of determining the maximum torque which may be produced comprises: determining from stored data a second correction factor which is a function of the engine inlet pressure and temperature; employing the second correction factor and both the actual inlet pressure and temperature to calculate a torque modifier; and using the torque modifier to adjust the determined maximum torque as a function of the engine inlet conditions.
Claim 10
Dependent Claim
115 words
The method of claim 7 wherein the step of correcting the determined maximum torque which may be produced is performed prior to using the torque modifier to adjust the determination and comprises: employing the actual values of inlet temperature and speed to calculate a speed address signal during a read-in mode; using the speed address to look up the predicted present torque from predetermined information; comparing the predicted present torque with the actual torque; recording any difference between the actual and predicted torques in a location identified by the speed address; and combining recorded torque difference information with predetermined torque information which are found at locations having the same speed addresses during a read-out mode.
References Cited (Backward Citations)
US3181353A
Cited
US3754440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |