US4656835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demand limit control by integral reset of thermostats
Assignee: Honeywell Inc
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Filing: 1986-09-15
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Granted: 1987-04-14
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Expires: 2006-09-15
Abstract
Abstract A temperature control system for a building is disclosed utilizing a central demand limit controller. The system includes a number of control modules or thermostats that have both proportional error and integral error functions. The integral error is reset at intervals by an interstage differential to drop single stages of air conditioning. This reduces demand until the maximum allowed demand is met. The integral error function is a timed function and the stages return in a random manner to restore setpoint temperature.
Inventors
- 👤 Kenneth B. Kidder
- 👤 Gary A. Smith
- 👤 Paul C. Wacker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:13
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; F24F11/46; F24F11/47; F24F11/50; F24F11/61; F24F11/62; F24F11/63; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1917; H; H02; H02J; H02J3/00; H02J3/12; H02J3/14; F24F2110/00; F24F2110/10; H02J2105/00; H02J2105/40; H02J2105/42; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222; Y04S20/242; Y04S20/244
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A temperature control system for an environmentally controlled space having a central demand limit controller, including: thermostat means with said thermostat means including proportional error means and integral error means; said central demand limit controller connected to said thermostat means with said central demand control means being capable of remotely changing an integral error of said integral error means; electrical load sensing means for sensing an electrical demand including electrical power drawn by environmental conditioning means for said controlled space; and said central demand limit controller periodically decrementing said integral error by a fixed amount upon electrical demand for said space exceeding a predetermined limit.
Claim 2
Dependent Claim
105 words
A temperature control system for an environmentally controlled space having a central demand limit controller, including: thermostat means with said thermostat means including proportional error means and integral error means; said central demand limit controller connected to said thermostat means with said central demand control means being capable of remotely changing an integral error of said integral error means; electrical load sensing means for sensing an electrical demand including electrical power drawn by environmental conditioning means for said controlled space; and said central demand limit controller periodically decrementing said integral error by a fixed amount upon electrical demand for said space exceeding a predetermined limit.
Claim 3
Dependent Claim
52 words
A temperature control system as claimed in claim 1 wherein said environmental conditioning mean has a plurality of stages that are capable of being sequentially activated with said activation being separated by interstage temperature differentials; and said fixed amount of decrementing of said integral error being equal to said interstage temperature differential.
Claim 4
Dependent Claim
28 words
A temperature control system as claimed in claim 2 wherein said environmental conditioning means is an electrically operated air conditioning means having a plurality of stages of cooling.
Claim 5
Dependent Claim
23 words
A temperature control system as claimed in claim 3 wherein said electrical load sensing means is a watt transducer or watt-hour pulse meter.
Claim 6
Dependent Claim
93 words
A temperature control system as claimed in claim 1 wherein said controlled space includes a plurality of individual zones; said thermostat means includes a plurality of thermostats with a thermostat in each of said individual zones; said environmental conditioning means including a plurality of multistage cooling units with a cooling unit for each individual zone; each cooling unit for a zone connected to one of said individual thermostats to control the temperature for said zone; and each of said cooling units having a plurality of stages that are capable of being sequentially activated.
Claim 7
Dependent Claim
47 words
A temperature control system as claimed in claim 5 wherein said plurality of multistage cooling units are capable of being sequentially activated with said activation being separated by interstage temperature differentials; and said fixed amount of decrementing of said integral error being equal to said interstage differential.
Claim 8
Dependent Claim
23 words
A temperature control system as claimed in claim 6 wherein said electrical load sensing means is a watt transducer or watt-hour pulse meter.
References Cited (Backward Citations)
US4010412A
Cited
US4228511A
Cited
US4272012A
Cited
US4276925A
Cited
US4356962A
Cited
US4408711A
Cited
US4387763A
Cited
US4446359A
Cited
US4473183A
Cited
US4501125A
Cited
US4509585A
Cited
US4542849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |