Electronic expansion valve without pressure sensor reading
US6148628A · kind A · utility
23Cited by
21References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1999 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Mar 26, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An system and process for controlling an electronic exchange valve for an transport refrigeration system evaporator in the absence of a evaporator outlet pressure transducer reading is disclosed. The process includes monitoring for the absence of reliable evaporator outlet pressure readings, monitoring the supply air temperature, and supplying the supply air temperature to a processor within a controller for use in an algorithm so as to approximate the saturation reference temperature and superheat levels to derive the necessary control signals for the EXV.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.