Method of refrigeration case control
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United States of America Patent
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-
Jul 9, 1996
Issued Date -
N/A
app pub date -
Mar 1, 1995
filing date -
Dec 22, 1993
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A method of controlling a refrigeration case of a refrigeration system including the steps of locating an expansion valve of a refrigeration case, moving the expansion valve of the refrigeration case out of a predetermined position, sampling temperature readings from an evaporator coil of a refrigeration case, calculating an adaptive proportional-integral-differential (PID) of the temperature of the evaporator coil for the refrigeration case, and moving the expansion valve to a second position closer to the predetermined position based on the calculated proportional-integral-differential until the temperature of the evaporator coil for the refrigeration case is within a predetermined temperature range.
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