Expansion valve control system and method and refrigeration unit employing the same
US7290402B1 · kind B1 · utility
13Cited by
4References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 29, 2003 |
| Grant date | Nov 6, 2007 |
| Priority date | — |
| Expiry date | Aug 11, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An expansion valve control system, a method of controlling an expansion valve and a refrigeration unit incorporating the same. In one embodiment, the expansion valve control system includes (1) a superheat error circuit configured to derive a superheat error for a fluid associated with the expansion valve and (2) a valve position circuit, associated with the superheat error circuit, configured to reposition the expansion valve proportionally based on both a current position thereof and the superheat error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.