Patent US2878983A successfully refreshed from Google Patents.
Patent US5274572A successfully refreshed from Google Patents.
US6937909B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pattern recognition adaptive controller
Assignee: Johnson Controls Technology Co
•
Filing: 2003-07-02
•
Granted: 2005-08-30
•
Expires: 2023-07-02
Abstract
Abstract A pattern recognition adaptive controller configured to dynamically adjust proportional gain and integral time control parameters based upon patterns that characterize the closed-loop response. The pattern recognition adaptive controller receives a sampled signal representative of the controlled variable, and determines a smoothed signal based on the sampled signal. The controller determines an estimated noise level of the sampled signal and determines if the control output and process output are oscillating quickly based on predefined criteria. The controller adjusts the gain used by the controller if the control output and process output are oscillating quickly. If the control output and process are not oscillating quickly, the controller determines whether there has been a significant load disturbance, whether there is an insignificant pattern, and/or whether the control output is saturated. Based on the results of these determinations, the controller either leaves the gain and integral time unchanged or determines new gain and integral time. The adjusted control parameters are then used to control the actuator, thereby causing the controller to affect the process.
Inventors
- 👤 John E. Seem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:04
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/0205; G05B13/024; G05B11/00; G05B11/01; G05B11/36; G05B11/42
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
114 words
A method of dynamically adjusting the control parameters of a proportional gain and integral time controller disposed to control an actuator affecting a process, comprising: sampling a feedback signal representative of a controlled variable of the process to generate a sampled signal; generating a smoothed signal based on the sampled signal; determining an estimated noise level of the sampled signal; determining if control output and process output are oscillating quickly based on predefined criteria; adjusting the gain used by the controller if the control output and process output are oscillating quickly; and utilizing the adjusted control parameters to control the actuator, thereby causing the proportional gain and integral time controller to affect the process.
Claim 2
Independent Claim
114 words
A method of dynamically adjusting the control parameters of a proportional gain and integral time controller disposed to control an actuator affecting a process, comprising: sampling a feedback signal representative of a controlled variable of the process to generate a sampled signal; generating a smoothed signal based on the sampled signal; determining an estimated noise level of the sampled signal; determining if control output and process output are oscillating quickly based on predefined criteria; adjusting the gain used by the controller if the control output and process output are oscillating quickly; and utilizing the adjusted control parameters to control the actuator, thereby causing the proportional gain and integral time controller to affect the process.
Claim 3
Dependent Claim
14 words
The method of claim 1 , wherein adjusting the gain comprises decreasing the gain.
Claim 4
Dependent Claim
44 words
The method of claim 1 , further comprising determining whether a significant load disturbance occurred by comparing a tune noise band to the difference between a current setpoint value and the smoothed signal if the control output and process output are not oscillating quickly.
Claim 5
Dependent Claim
23 words
The method of claim 3 , wherein the gain and integral time remain the same if a significant load disturbance has not occurred.
Claim 6
Dependent Claim
35 words
The method of claim 3 , further comprising characterizing a closed loop response by monitoring features from a control signal, smoothed process output, and slope of the process output if a significant load disturbance occurred.
Claim 7
Dependent Claim
29 words
The method of claim 5 , further comprising determining whether a pattern is insignificant based on a setpoint and tune noise band or whether the control output is saturated.
Claim 8
Dependent Claim
26 words
The method of claim 6 , wherein the gain and integral time remain the same when the pattern is insignificant or the control output is saturated.
Claim 9
Dependent Claim
29 words
The method of claim 6 , wherein a new gain and new integral time are determined when the pattern is not insignificant and the control output is not saturated.
Claim 10
Dependent Claim
62 words
The method of claim 8 , wherein the new gain and new integral time are determined based on estimated optimal gain, estimated optimal integral time, current gain and integral time values used in the proportional gain and integral time controller, a signal-to-noise ratio of the sampled signal, and size of a current load disturbance or setpoint change relative to average disturbance size.
Claim 11
Independent Claim
125 words
An apparatus for dynamically adjusting control parameters of a proportional gain and integral time controller disposed to control an actuator affecting a process, comprising: means for sampling a feedback signal representative of a controlled variable of the process to generate a sampled signal; means for generating a smoothed signal based on the sampled signal; means for determining an estimated noise level of the sampled signal; means for determining if control output and process output are oscillating quickly based on predefined criteria; means for adjusting the gain used by the controller if the control output and process output are oscillating quickly; and means for utilizing the adjusted control parameters to control the actuator, thereby causing the proportional gain and integral time controller to affect the process.
Claim 12
Independent Claim
125 words
An apparatus for dynamically adjusting control parameters of a proportional gain and integral time controller disposed to control an actuator affecting a process, comprising: means for sampling a feedback signal representative of a controlled variable of the process to generate a sampled signal; means for generating a smoothed signal based on the sampled signal; means for determining an estimated noise level of the sampled signal; means for determining if control output and process output are oscillating quickly based on predefined criteria; means for adjusting the gain used by the controller if the control output and process output are oscillating quickly; and means for utilizing the adjusted control parameters to control the actuator, thereby causing the proportional gain and integral time controller to affect the process.
Claim 13
Dependent Claim
14 words
The apparatus of claim 10 , wherein adjusting the gain comprises decreasing the gain.
Claim 14
Dependent Claim
46 words
The apparatus of claim 10 , further comprising means for determining whether a significant load disturbance occurred by comparing a tune noise band to the difference between a current setpoint value and the smoothed signal if the control output and process output are not oscillating quickly.
Claim 15
Dependent Claim
26 words
The apparatus of claim 12 , further comprising means for not changing the gain and integral time values if a significant load disturbance has not occurred.
Claim 16
Dependent Claim
37 words
The apparatus of claim 12 , further comprising means for characterizing a closed loop response by monitoring features from a control signal, smoothed process output, and slope of the process output if a significant load disturbance occurred.
Claim 17
Dependent Claim
31 words
The apparatus of claim 14 , further comprising means for determining whether a pattern is insignificant based on a setpoint and tune noise band or whether the control output is saturated.
Claim 18
Dependent Claim
29 words
The apparatus of claim 15 , further comprising means for not changing the gain and integral time values when the pattern is insignificant or the control output is saturated.
Claim 19
Dependent Claim
31 words
The apparatus of claim 15 , further comprising means for determining a new gain and new integral time when the pattern is not insignificant and the control output is not saturated.
Claim 20
Dependent Claim
66 words
The apparatus of claim 16 , further comprising a means for determining a new gain and new integral time based on an estimated optimal gain, estimated optimal integral time, current gain and integral time values used in the proportional gain and integral time controller, a signal-to-noise ratio of the sampled signal, and size of a current load disturbance or setpoint change relative to average disturbance size.
Claim 21
Independent Claim
149 words
A method of dynamically adjusting the control parameters of a proportional gain and integral time controller disposed to control an actuator affecting a process, comprising: sampling a feedback signal representative of a controlled variable of the process to generate a sampled signal; generating a smoothed signal based on the sampled signal; determining an estimated noise level of the sampled signal; determining whether a pattern is insignificant based on a setpoint and tune noise band and whether the control output is saturated; determining a new gain and a new integral time and setting the gain and integral time of the proportional gain and integral time controller to the new gain and new integral time if the pattern is not insignificant and the control output is not saturated; and utilizing the adjusted control parameters to control the actuator, thereby causing the proportional gain and integral time controller to affect the process.
Claim 22
Independent Claim
149 words
A method of dynamically adjusting the control parameters of a proportional gain and integral time controller disposed to control an actuator affecting a process, comprising: sampling a feedback signal representative of a controlled variable of the process to generate a sampled signal; generating a smoothed signal based on the sampled signal; determining an estimated noise level of the sampled signal; determining whether a pattern is insignificant based on a setpoint and tune noise band and whether the control output is saturated; determining a new gain and a new integral time and setting the gain and integral time of the proportional gain and integral time controller to the new gain and new integral time if the pattern is not insignificant and the control output is not saturated; and utilizing the adjusted control parameters to control the actuator, thereby causing the proportional gain and integral time controller to affect the process.
Claim 23
Dependent Claim
63 words
The method of claim 19 , wherein the new gain and new integral time are determined based on an estimated optimal gain, estimated optimal integral time, current gain and integral time values used in the proportional gain and integral time controller, a signal-to-noise ratio of the sampled signal, and size of a current load disturbance or setpoint change relative to average disturbance size.
Claim 24
Dependent Claim
22 words
The method of claim 19 , further comprising determining whether control output and process output are oscillating quickly based on predefined criteria.
Claim 25
Dependent Claim
38 words
The method of claim 21 , further comprising adjusting the gain used by the proportional gain and integral time controller if the control output and process output are oscillating quickly, wherein adjusting the gain comprises decreasing the gain.
Claim 26
Dependent Claim
45 words
The method of claim 21 , further comprising determining whether a significant load disturbance has occurred by comparing a tune noise band to the difference between a current setpoint value and the smoothed signal if the control output and process output are not oscillating quickly.
Claim 27
Dependent Claim
23 words
The method of claim 23 , wherein the gain and integral time remain the same if a significant load disturbance has not occurred.
Claim 28
Dependent Claim
36 words
The method of claim 24 , further comprising characterizing a closed loop response by monitoring features from a control signal, smoothed process output, and slope of the process output if a significant load disturbance has occurred.
Claim 29
Dependent Claim
26 words
The method of claim 19 , wherein the gain and integral time remain the same when the pattern is insignificant or the control output is saturated.
References Cited (Backward Citations)
US3906196A
Cited
US5157597A
Cited
US5355305A
Cited
US5506768A
Cited
US5568377A
Cited
US5805448A
Cited
US6540148B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-08-29 | 2009-02-28 | 2009-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-08-29 | 2013-02-28 | 2013-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-08-29 | 2017-02-28 | 2017-08-30 | $7700.00 | Window Closed / Lapsed |