US5157934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controller for electrically driven expansion valve of refrigerating cycle
Assignee: Toshiba Corp
•
Filing: 1991-06-27
•
Granted: 1992-10-27
•
Expires: 2011-06-27
Abstract
Abstract A valve controller which controls the opening degree of an electrically driven expansion valve mounted in the refrigerating cycle, in accordance with a difference between a refrigerant saturation temperature of an outdoor heat exchanger detected with a first temperature sensor and a refrigerant temperature at the suction port of a compressor detected with a second temperature sensor. A sensor error correcting unit is provided whereby a detected temperature error is calculated in accordance with the outputs of the first and second temperature sensors exposed in an atmospheric air having a specific temperature, and in accordance with the detected temperature error, a difference between the refrigerant saturation temperature and the refrigerant temperature at the suction port of the compressor is corrected.
Inventors
- 👤 Tadashi Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:47
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/70; F24F11/80; F24F11/83; F24F11/84; F24F11/50; F24F11/61; F24F11/62; F24F11/63; F24F11/64; F24F11/86; F25; F25B; F25B13/00; F25B41/00; F25B41/30; F25B41/31; F25B41/34; F25B49/00; F25B49/02; F25B49/025; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1927; G05D23/193; G05D23/1931; F24F11/30; F24F2110/00; F24F2110/10; F24F2140/00; F25B2600/00; F25B2600/02; F25B2600/021; F25B2600/21; F25B2600/25; F25B2600/2513; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
A controller for controlling an electrically driven expansion valve mounted in a refrigerating cycle including a capacity variable compressor, an outdoor heat exchanger, the expansion valve, and an indoor heat exchanger, comprising: a first temperature sensor for detecting a refrigerant saturation temperature of said outdoor heat exchanger; a second temperature sensor for detecting a refrigerant temperature at the suction port of said compressor; sensor error correcting means for calculating a detected temperature error on the basis of the outputs from said first and second temperature sensors when both are exposed in an atmospheric air at a specific temperature, in accordance with said detected temperature error, correcting a difference between said refrigerant saturation temperature and said refrigerant temperature at the suction port of said compressor, and outputting said corrected temperature difference; and valve controlling means for controlling the opening degree of said electrically driven expansion valve in accordance with said corrected temperature difference.
Claim 2
Dependent Claim
152 words
A controller for controlling an electrically driven expansion valve mounted in a refrigerating cycle including a capacity variable compressor, an outdoor heat exchanger, the expansion valve, and an indoor heat exchanger, comprising: a first temperature sensor for detecting a refrigerant saturation temperature of said outdoor heat exchanger; a second temperature sensor for detecting a refrigerant temperature at the suction port of said compressor; sensor error correcting means for calculating a detected temperature error on the basis of the outputs from said first and second temperature sensors when both are exposed in an atmospheric air at a specific temperature, in accordance with said detected temperature error, correcting a difference between said refrigerant saturation temperature and said refrigerant temperature at the suction port of said compressor, and outputting said corrected temperature difference; and valve controlling means for controlling the opening degree of said electrically driven expansion valve in accordance with said corrected temperature difference.
Claim 3
Dependent Claim
36 words
A controller according to claim 1, wherein said valve controlling means includes an initial opening degree holding data table for storing a relationship between a rotation speed of said compressor and said valve opening degree command.
Claim 4
Dependent Claim
48 words
A controller according to claim 1, wherein said valve controlling means includes a first timer used for supplying said valve opening degree command read out of said initial valve opening degree holding data table for a predetermined first time period starting from the operation of said air conditioner.
Claim 5
Dependent Claim
38 words
A controller according to claim 1, wherein said valve controlling means includes a super heat temperature setting data table for storing a relationship between a rotation speed of said compressor and a super heat temperature to be set.
Claim 6
Dependent Claim
56 words
A controller according to claim 4, wherein said valve controlling means includes a correction value table, responsive to an inputted difference between said corrected temperature difference and a super heat temperature read from said super heat temperature setting data table, for outputting a stored correction value of said valve opening degree corresponding to said inputted difference.
Claim 7
Dependent Claim
48 words
A controller according to claim 5, wherein said valve controlling means includes a second timer used for correcting said valve opening command read from said initial opening degree holding data table at a predetermined time interval, in accordance with said correction value read from said correction value table.
References Cited (Backward Citations)
US4375753A
Cited
US4527399A
Cited
US4617804A
Cited
JPS6251384A
Cited
JPS6345030A
Cited
US4848099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |