Patent ID: 9746224
Date: 2017-08-29
CPC Classifications: F25B,Y02B

Claim:
1. A system comprising: an error module configured to receive a superheat signal from a superheat module and integrate over time the difference between the superheat signal and a superheat setpoint value to generate an error signal, wherein the superheat signal indicates suction superheat values of a compressor; a comparison module configured to compare the error signal to a first predetermined threshold to generate a first comparison signal based on the comparison; a zero-crossing module configured to compare a first count value to a second predetermined threshold to generate a second comparison signal, wherein the first count value is generated based on at least one comparison between the superheat signal and the superheat setpoint value; a setpoint module configured to adjust the superheat setpoint based on the first comparison signal and the second comparison signal; and a control module configured to adjust the position of an expansion valve based on the superheat setpoint.