US4594714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-actuator monitor
Assignee: RTX Corp
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Filing: 1983-05-02
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Granted: 1986-06-10
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Expires: 2003-05-02
Abstract
Abstract In a dual actuator system, runaways are identified by comparing the position and rate of one actuator to another. When there is a threshold position discrepancy and a sustained rate discrepancy, a fault is indicated. The faster actuator is identified as the runaway.
Inventors
- 👤 William C. Fischer
- 👤 David J. Verzella
- 👤 Stuart C. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:54
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055; G05D1/0077; G05B; G05B9/00; G05B9/02; G05B9/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
200 words
A dual actuator monitor for use with a positioning system that has a first actuator and a second actuator for positioning a mechanism, that comprises: a first position sensor for providing a first position signal indicative of the position of the first actuator; a second position sensor for providing a second position signal indicative of the position of the second actuator; and signal processing means, connected for response to the first position sensor and the second position sensor, for providing a first rate signal indicative of the absolute rate of the first actuator, for providing a second rate signal indicative of the absolute rate of the second actuator, for providing a position discrepancy signal when the difference in actuator position indicated by the first position signal and the second position signal exceeds a threshold, for providing a rate discrepancy signal in response to the first position signal and the second position signal indicating a relative change in positions between the first actuator and the second actuator in excess of a threshold that is sustained for more than a reference time interval, and for providing a fault signal when the position discrepancy signal and the rate discrepancy signal are both present.
Claim 2
Dependent Claim
200 words
A dual actuator monitor for use with a positioning system that has a first actuator and a second actuator for positioning a mechanism, that comprises: a first position sensor for providing a first position signal indicative of the position of the first actuator; a second position sensor for providing a second position signal indicative of the position of the second actuator; and signal processing means, connected for response to the first position sensor and the second position sensor, for providing a first rate signal indicative of the absolute rate of the first actuator, for providing a second rate signal indicative of the absolute rate of the second actuator, for providing a position discrepancy signal when the difference in actuator position indicated by the first position signal and the second position signal exceeds a threshold, for providing a rate discrepancy signal in response to the first position signal and the second position signal indicating a relative change in positions between the first actuator and the second actuator in excess of a threshold that is sustained for more than a reference time interval, and for providing a fault signal when the position discrepancy signal and the rate discrepancy signal are both present.
Claim 3
Dependent Claim
242 words
A dual actuator monitor for use with a positioning system that has a first actuator and a second actuator for positioning a mechanism, that comprises: a first position sensor for providing a first position signal indicative of the position of the first actuator; a second position sensor for providing a second position signal indicative of the position of the second actuator; and signal processing means, connected for response to the first position sensor and the second position sensor, for providing a first rate signal indicative of the absolute rate of the first actuator, for providing a second rate signal indicative of the absolute rate of the second actuator, for providing a position discrepancy signal when the difference in actuator position indicated by the first position signal and the second position signal exceeds a threshold, for providing a rate discrepancy signal in response to the first position signal and the second position signal indicating a relative change in positions between the first actuator and the second actuator in excess of a threshold that is sustained for more than a reference time interval, for indicating a first actuator fault when the position discrepancy signal and the rate discrepancy signal are present and the first rate signal is greater than the second rate signal, and for indicating a second actuator fault when the position discrepancy signal and the rate discrepancy signal are present and the second rate signal is greater than the first rate signal.
Claim 4
Dependent Claim
242 words
A dual actuator monitor for use with a positioning system that has a first actuator and a second actuator for positioning a mechanism, that comprises: a first position sensor for providing a first position signal indicative of the position of the first actuator; a second position sensor for providing a second position signal indicative of the position of the second actuator; and signal processing means, connected for response to the first position sensor and the second position sensor, for providing a first rate signal indicative of the absolute rate of the first actuator, for providing a second rate signal indicative of the absolute rate of the second actuator, for providing a position discrepancy signal when the difference in actuator position indicated by the first position signal and the second position signal exceeds a threshold, for providing a rate discrepancy signal in response to the first position signal and the second position signal indicating a relative change in positions between the first actuator and the second actuator in excess of a threshold that is sustained for more than a reference time interval, for indicating a first actuator fault when the position discrepancy signal and the rate discrepancy signal are present and the first rate signal is greater than the second rate signal, and for indicating a second actuator fault when the position discrepancy signal and the rate discrepancy signal are present and the second rate signal is greater than the first rate signal.
References Cited (Backward Citations)
US4043526A
Cited
US4130241A
Cited
US4095763A
Cited
US4209734A
Cited
US4460964A
Cited
US4472806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |