Expansion valve control system and method and refrigeration...

Details Expansion valve control system and method and refrigeration... Expansion valve control system and method and refrigeration...

2007-11-06

2007-11-06

Norman, Marc (Department: 3744)

Refrigeration

Automatic control

Refrigeration producer

C236S09200D

Reexamination Certificate

active

10747460

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.

REFERENCES:
patent: 4689968 (1987-09-01), McCulloch et al.
patent: 5551248 (1996-09-01), Derosier
patent: 5771703 (1998-06-01), Rajendran
patent: 6318101 (2001-11-01), Pham et al.

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