Patent ID: 7992398

Claim:
A control apparatus for a refrigeration system comprising: a. one or more evaporators, each having an inlet and an outlet; b. one or more controlled refrigerator zones operably associated with said one or more evaporators; c. one or more controlled refrigerator zone sensors operably associated with one or more controlled refrigerator zones and capable of detecting one or more controlled refrigerator zone temperatures; d. one or more evaporator outlet temperature sensors; e. an electronic evaporator pressure regulating (EEPR) valve disposed along a suction line of the refrigeration system and having an open and a closed position and capable of modulating between said open and said closed position; f. one or more refrigerant pressure sensors capable of detecting pressure in the suction line of the refrigeration system; and g. a control module configured to receive inputs from said one or more controlled refrigerator zone sensors, said one or more evaporator outlet temperature sensors, and said one or more refrigerant pressure sensors, wherein said control module is configured to use one or more of said inputs to learn a baseline superheat during normal operation, compute an actual amount of superheat, and take control action on the EEPR valve in response to the comparison of said baseline superheat and said actual superheat.