US3775745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine over-temperature warning system
Assignee: Individual
•
Filing: 1972-02-03
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Granted: 1973-11-27
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Expires: 1992-02-03
Abstract
Abstract An engine over-temperature warning system is especially, although not exclusively, adapted for use in turbine powered helicopters. The system comprises a solid state electronic circuit which is constructed to monitor engine temperatures, and other parameters, so as to provide a warning to the pilot, not only when permissible engine temperatures have been exceeded during starting or in-flight operations, but also when other conditions have occurred which inevitably would lead to engine overheating, so that corrective measures may be taken.
Inventors
- 👤 A Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:12
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/021; F; F01; F01D; F01D17/00; F01D17/02; F01D17/08; F01D17/085
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
An over-temperature warning system for use with an internal combustion turbine engine, piston engine, or the like, for monitoring engine outlet temperatures and engine starter voltages to provide an indication when an overheating condition in the engine has occurred, or when an overheating condition inevitably will occur unless corrective measures are taken, said system including: a first input circuit for connection to an electrical temperature transducer which senses the outlet temperature of the engine; a second input circuit for connection to the starter voltage terminal of the engine; an output circuit; and an overheating detector circuit coupling said first input circuit and said second input circuit to said output circuit for developing an output signal in said output circuit when the starter of the engine is energized during a condition when said outlet temperature exceeds a predetermined temperature.
Claim 2
Dependent Claim
138 words
An over-temperature warning system for use with an internal combustion turbine engine, piston engine, or the like, for monitoring engine outlet temperatures and engine starter voltages to provide an indication when an overheating condition in the engine has occurred, or when an overheating condition inevitably will occur unless corrective measures are taken, said system including: a first input circuit for connection to an electrical temperature transducer which senses the outlet temperature of the engine; a second input circuit for connection to the starter voltage terminal of the engine; an output circuit; and an overheating detector circuit coupling said first input circuit and said second input circuit to said output circuit for developing an output signal in said output circuit when the starter of the engine is energized during a condition when said outlet temperature exceeds a predetermined temperature.
Claim 3
Dependent Claim
38 words
The warning system defined in claim 1, in which said overheating detector circuit developes an output signal in said output circuit when said outlet temperature exceeds a different predetermined temperature when the starter of the engine is de-energized.
Claim 4
Dependent Claim
48 words
The over-temperature warning system defined in claim 1 which includes slope detection means coupling said first input circuit to said output circuit for developing an output signal in said output circuit when said outlet temperature exceeds a predetermined threshold and is increasing in excess of a predetermined rate.
Claim 5
Dependent Claim
66 words
The over-temperature warning system defined in claim 1 which includes a voltage detector and timer circuit coupling said second input circuit to said output circuit for developing a signal in said output circuit a predetermined time after the activation of the starter of the engine if the starter voltage of the engine is less than a first predetermined valve but greater than a second predetermined valve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |