US5084825A
Expired / Lapsed
US
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Process control with guard band and fault limit
Assignee: BCT SPECTRUM Inc A CORP OF DELAWARE
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Filing: 1988-03-07
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Granted: 1992-01-28
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Expires: 2008-03-07
Abstract
Abstract A process control system is disclosed in which process variables are treated as mapped in n-dimensional space, where n is the number of orthogonal directions. Three functions, set, check, and term, provide the link between expected and actual conditions. The check and term functions operate on orthogonal coordinates. Each parameter has a guard band to provide a soft boundary for the parameter.
Inventors
- 👤 John H. Kelly
- 👤 Mark S. Lanus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:44
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/0265
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A method for controlling a parameter in a multi-parameter process comprising the steps of: setting the parameter to a desired value; producing an electrical signal related to said parameter; checking the magnitude of said signal against first and second sets of predetermined limits, wherein said first set of limits is wider than and includes said second set of limits; and continuing said process if said signal is within said first set of limits; recording said signal when said signal is within a guard band, viz. within said first set of limits and outside of said second set of limits; terminating said process if said signal is not within said first set of limits, indicating a fault condition.
Claim 2
Independent Claim
117 words
A method for controlling a parameter in a multi-parameter process comprising the steps of: setting the parameter to a desired value; producing an electrical signal related to said parameter; checking the magnitude of said signal against first and second sets of predetermined limits, wherein said first set of limits is wider than and includes said second set of limits; and continuing said process if said signal is within said first set of limits; recording said signal when said signal is within a guard band, viz. within said first set of limits and outside of said second set of limits; terminating said process if said signal is not within said first set of limits, indicating a fault condition.
Claim 3
Dependent Claim
20 words
The method as set forth in claim 1 wherein said limits correspond to predetermined, fixed percentages of said desired value.
Claim 4
Dependent Claim
53 words
The method as set forth in claim 1, wherein at least two parameters are controlled by performing all of said steps on each parameter, and further comprising the step of: changing the limits for the magnitude of the signal for one parameter in accordance with the magnitude of the signal for another parameter.
Claim 5
Dependent Claim
33 words
The method as set forth in claim 3 wherein said process is divided into a plurality of intervals and wherein said setting and checking steps are performed at least once in each interval.
Claim 6
Dependent Claim
21 words
The method as set forth in claim 4 wherein said setting and checking steps are performed several times in each interval.
Claim 7
Dependent Claim
33 words
The method as set forth in claim 1 wherein said process is divided into a plurality of intervals and wherein said setting and checking steps are performed at least once in each interval.
Claim 8
Dependent Claim
21 words
The method as set forth in claim 6 wherein said setting and checking steps are performed several times in each interval.
References Cited (Backward Citations)
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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) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |