Variable superheat target strategy for controlling an electrically operated refrigerant expansion valve
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United States of America Patent
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Feb 23, 1993
Grant Date -
N/A
app pub date -
Apr 10, 1992
filing date -
Apr 10, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of controlling a refrigeration system employing an electronic controller for operating an electrically actuated refrigerant expansion valve supplying the evaporator or endothermic heat exchanger. The controller is of the type which modulates the valve for refrigerant flow to maintain a desired target level of superheated vapor discharging from the evaporator. When the compressor return, or evaporator discharge pressure (P.sub.c) is within a preselected range the system employs a strategy to increment or decrement the target level of superheat depending upon whether the rate of change (.DELTA.P.sub.c) of discharge pressure is positive or negative and thereby maximize pulldown by minimizing compressor cycling to achieve the superheat target.
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