Patent DE2245196C3 successfully refreshed from Google Patents.
US5224664A
Expired / Lapsed
US
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Adaptive control system input limiting
Assignee: RTX Corp
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Filing: 1991-07-22
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Granted: 1993-07-06
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Expires: 2011-07-22
Abstract
Abstract A control system, having an input command signal and driving a prime mover, is provided with variable magnitude and/or rate input signal limiting that is adjusted by maps 68,70,72,74 which set the limits for a variable magnitude limiter 14 and a variable rate limiter 22 as a function of the prime mover rate. The limiting is adjusted dynamically as the prime mover rate changes. When the prime mover enters an undesirable operating condition, the maps only limit the command signal in the direction of such condition. The adjustable limiting is enabled or disabled based on the position, rate, and/or acceleration of the prime mover.
Inventors
- 👤 Don L. Adams, Sr.
- 👤 Stuart C. Wright
- 👤 David J. Verzella
- 👤 Troy J. LaMontagne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:07
CPC Classifications
G; G05; G05B; G05B5/00; G05B5/01; Y; Y10; Y10S; Y10S424/00; Y10S424/819
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
An adaptive control system input limiter, comprising: a control system providing output drive signals in response to an input command signal indicative of the desired output of said control system; a prime mover, responsive to said output drive signals from said control system; an input limiter, responsive to the status of said prime mover, for limiting at least one parameter of said input command signal to a predetermined value when said status of said prime mover approaches an undesirable operating condition, said limiting being solely along the direction of said undesirable operating condition, and said predetermined value being related to prime mover rate; and said input command signal being a percent pitch command for a helicopter.
Claim 2
Dependent Claim
116 words
An adaptive control system input limiter, comprising: a control system providing output drive signals in response to an input command signal indicative of the desired output of said control system; a prime mover, responsive to said output drive signals from said control system; an input limiter, responsive to the status of said prime mover, for limiting at least one parameter of said input command signal to a predetermined value when said status of said prime mover approaches an undesirable operating condition, said limiting being solely along the direction of said undesirable operating condition, and said predetermined value being related to prime mover rate; and said input command signal being a percent pitch command for a helicopter.
Claim 3
Dependent Claim
18 words
Apparatus of claim 1 wherein said status of said prime mover is the position of said prime mover.
Claim 4
Dependent Claim
18 words
Apparatus of claim 1 wherein said status of said prime mover is the velocity of said prime mover.
Claim 5
Dependent Claim
20 words
Apparatus of claim 1 wherein said parameter of said input command signal is the magnitude of said input command signal.
Claim 6
Dependent Claim
28 words
Apparatus of claim 1 wherein said parameter of said input command signal is the rate of change of magnitude with respect to time of said input command signal.
Claim 7
Dependent Claim
20 words
Apparatus of claim 1 wherein said prime mover comprises an electro-hydraulic actuator controlling the pitch attitude axis of a helicopter.
Claim 8
Dependent Claim
29 words
Apparatus of claim 6 wherein said undesirable operating condition comprises a predetermined position of said electro-hydraulic actuator corresponding to a tip path plane near the fuselage of the helicopter.
Claim 9
Dependent Claim
54 words
Apparatus of claim 6 wherein said undesirable operating condition comprises a predetermined position of said electro-hydraulic actuator corresponding to a tip path plane near the fuselage of the helicopter and a predetermined rate of change of position with respect to time of said electro-hydraulic actuator corresponding to said tip path plane approaching the fuselage.
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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) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |