US6785630B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature control balancing desired comfort with energy cost savings
Assignee: Carrier Corp
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Filing: 2002-02-04
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Granted: 2004-08-31
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Expires: 2022-02-04
Abstract
Abstract A temperature regulating system utilizes changing energy price information to alter the system operation. A performance index value is determined that indicates a balance between a user's preference for maintaining a setpoint temperature and a need for maintaining energy cost savings. The performance index value is related to the current energy price and the system automatically responds to rising energy prices by reducing system operation in a manner that provides cost savings according to a user's specified preference for weighting temperature comfort levels compared to energy cost savings. According to the described example, an optimal control solution is used to determine the performance index value.
Inventors
- 👤 Richard A. Kolk
- 👤 Raymond J. Archacki, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:30
CPC Classifications
G; G01; G01K; G01K3/00; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; G05D23/1923
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
79 words
A method of controlling a temperature regulating system, comprising the steps of: defining a performance index that indicates a desired balance between maintaining a user selected setpoint temperature and conserving energy costs; determining a current energy cost; determining a value of the performance index using an optimal control solution and the current energy cost; and adjusting a sensitivity of the system to a difference between the setpoint temperature and a current actual temperature according to the performance index value.
Claim 2
Independent Claim
79 words
A method of controlling a temperature regulating system, comprising the steps of: defining a performance index that indicates a desired balance between maintaining a user selected setpoint temperature and conserving energy costs; determining a current energy cost; determining a value of the performance index using an optimal control solution and the current energy cost; and adjusting a sensitivity of the system to a difference between the setpoint temperature and a current actual temperature according to the performance index value.
Claim 3
Dependent Claim
34 words
The method of claim 1 , including reducing the sensitivity when the performance index value indicates that conserving energy costs is preferable to maintaining the user-selected setpoint temperature based upon the current energy cost.
Claim 4
Dependent Claim
25 words
The method of claim 2 , including subsequently increasing the sensitivity when the performance index value changes because the current energy cost is relatively lower.
Claim 5
Dependent Claim
18 words
The method of claim 1 , including reducing the sensitivity responsive to an increase in the energy cost.
Claim 6
Dependent Claim
23 words
The method of claim 4 , including adjusting the sensitivity by adjusting a time within which the system reacts to the temperature difference.
Claim 7
Dependent Claim
21 words
The method of claim 4 , including automatically at least temporarily resetting the setpoint temperature responsive to the performance index value.
Claim 8
Dependent Claim
90 words
The method of claim 1 , including determining the performance index by estimating a value of PI = ∫ 0 ∝ ( QT 2 + Ru 2 ) u wherein Q is a user-selected weighting factor indicating the user's desire to maintain the setpoint temperature; T is the temperature difference; R is a determined weighting factor indicating the need to balance energy cost savings with the user's desire to maintain the setpoint temperature; and u is a value indicating system operation responsive to the temperature difference.
Claim 9
Dependent Claim
16 words
The method of claim 7 , including estimating the performance index using a degenerate Ricatti equation.
Claim 10
Dependent Claim
27 words
The method of claim 1 , including using the performance index value to determine a gain value and applying the gain value to the system control signal.
Claim 11
Dependent Claim
64 words
The method of claim 9 , including determining the gain value by determining a value of k T =−PBR −1 wherein k is the gain value; P is the estimated performance index value; B is a predetermined system gain value; and R is a determined weighting factor indicating the need to balance energy cost savings with the user's desire to maintain the setpoint temperature.
Claim 12
Dependent Claim
119 words
A temperature regulating system, comprising: a thermostat device having a user input portion that allows a user to input a setpoint temperature and a sensor portion that provides an indication of a current temperature near the thermostat device; a communication module that is capable of receiving information from an outside source remote from the thermostat device; and a controller that determines a current energy price from information received by the communication module, determines a performance index value indicative of a balance between a user-specified desire to maintain the setpoint temperature and energy cost savings and automatically adjusts a sensitivity of the system to a difference between the current temperature and the setpoint temperature according to the performance index value.
Claim 13
Dependent Claim
119 words
A temperature regulating system, comprising: a thermostat device having a user input portion that allows a user to input a setpoint temperature and a sensor portion that provides an indication of a current temperature near the thermostat device; a communication module that is capable of receiving information from an outside source remote from the thermostat device; and a controller that determines a current energy price from information received by the communication module, determines a performance index value indicative of a balance between a user-specified desire to maintain the setpoint temperature and energy cost savings and automatically adjusts a sensitivity of the system to a difference between the current temperature and the setpoint temperature according to the performance index value.
Claim 14
Dependent Claim
29 words
The system of claim 11 , wherein the controller automatically slows down a response time of the system to the temperature difference responsive to an increase in energy costs.
Claim 15
Dependent Claim
24 words
The system of claim 11 , wherein the controller automatically at least temporarily resets the setpoint temperature responsive to an increase in energy costs.
Claim 16
Dependent Claim
32 words
The system of claim 11 , wherein the controller automatically adjusts a gain of a control value that directs an amount of airflow through the system according to the performance index value.
Claim 17
Dependent Claim
66 words
The system of claim 11 , wherein the controller determines the gain value by determining a value of k T =−PBR −1 wherein k is the gain value; P is the estimated performance index value; B is a predetermined system gain value; and R is a determined weighting factor indicating the need to balance energy cost savings with the user's desire to maintain the setpoint temperature.
Claim 18
Dependent Claim
92 words
The system of claim 11 , wherein the controller determines the performance index by estimating a value of PI = ∫ 0 ∝ ( QT 2 + Ru 2 ) u wherein Q is a user-selected weighting factor indicating the user's desire to maintain the setpoint temperature; T is the temperature difference; R is a determined weighting factor indicating the need to balance energy cost savings with the user's desire to maintain the setpoint temperature; and u is a value indicating system operation responsive to the temperature difference.
Claim 19
Dependent Claim
18 words
The system of claim 16 , wherein the controller estimates the performance index using a degenerate Ricatti equation.
Claim 20
Dependent Claim
22 words
The system of claim 16 , wherein R is a ratio of the current energy price to a predetermined nominal energy price.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-08-31 | 2008-03-01 | 2008-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-08-31 | 2012-03-01 | 2012-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-08-31 | 2016-03-01 | 2016-08-31 | $7700.00 | Window Closed / Lapsed |