US4915613A
Expired / Lapsed
US
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Method and apparatus for monitoring pressure sensors
Assignee: Honeywell Inc
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Filing: 1989-01-25
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Granted: 1990-04-10
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Expires: 2009-01-25
Abstract
Abstract A method and apparatus monitor fuel pressure in a heating system where a controller controls actuation of fuel valves. A fuel pressure limit signal is provided to the controller for determining if the fuel pressure crosses predetermined thresholds. In order to avoid nuisance shut-downs, the fuel pressure limit signal is ignored by the controller for a predetermined time interval after the controller has actuated a fuel valve.
Inventors
- 👤 William R. Landis
- 👤 Paul A. Schimbke
- 👤 Michael J. Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:26
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/24; F23N5/242; F23N2223/00; F23N2223/08; F23N2225/00; F23N2225/04; F23N2227/00; F23N2227/12; F23N2233/00; F23N2233/06; F23N2235/00; F23N2235/12; F23N2235/18; F23N5/02; F23N5/12; F23N5/20; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7725
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A method for monitoring fuel pressure in a heating system where a controller controls actuation of fuel valves, the method comprising the steps of: providing a fuel pressure threshold signal to the controller for determining whether the fuel pressure reaches predetermined thresholds; and ignoring the fuel pressure threshold signal for a predetermined time interval after the controller has actuated a fuel valve, to compensate for momentary, transient pressure changes caused by actuation of the fuel valve.
Claim 2
Independent Claim
76 words
A method for monitoring fuel pressure in a heating system where a controller controls actuation of fuel valves, the method comprising the steps of: providing a fuel pressure threshold signal to the controller for determining whether the fuel pressure reaches predetermined thresholds; and ignoring the fuel pressure threshold signal for a predetermined time interval after the controller has actuated a fuel valve, to compensate for momentary, transient pressure changes caused by actuation of the fuel valve.
Claim 3
Dependent Claim
23 words
The method of claim 1 and further comprising the step of: responding to the fuel pressure threshold signal after the predetermined time interval.
Claim 4
Dependent Claim
37 words
The method of claim 2 wherein the step of responding to the fuel pressure limit signal further comprises the step of: causing a safety shut-down state to be entered when the fuel pressure reaches the predetermined thresholds.
Claim 5
Independent Claim
84 words
An apparatus for monitoring fuel pressure in a heating system where a controller controls actuation of fuel valves, the apparatus comprising: sensing means for sensing the fuel pressure and for providing a fuel pressure threshold signal to the controller when the fuel pressure reaches a predetermined threshold; and masking means for masking the fuel pressure threshold signal for a predetermined time interval after the controller has actuated a fuel valve, to compensate for momentary, transient pressure changes caused by actuation of the fuel valve.
Claim 6
Independent Claim
84 words
An apparatus for monitoring fuel pressure in a heating system where a controller controls actuation of fuel valves, the apparatus comprising: sensing means for sensing the fuel pressure and for providing a fuel pressure threshold signal to the controller when the fuel pressure reaches a predetermined threshold; and masking means for masking the fuel pressure threshold signal for a predetermined time interval after the controller has actuated a fuel valve, to compensate for momentary, transient pressure changes caused by actuation of the fuel valve.
Claim 7
Dependent Claim
23 words
The apparatus of claim 4 and further comprising: responding means for responding to the fuel pressure threshold signal after the predetermined time interval.
Claim 8
Dependent Claim
31 words
The apparatus of claim 5 wherein the responding means further comprises: safety shut-down means for causing a safety shut-down state to be entered when the fuel pressure reaches a predetermined threshold.
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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) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |