Expansion valve setpoint control systems and methods

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United States of America Patent

PATENT NO 9746224
SERIAL NO

14078734

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A system includes an error module configured to integrate a difference between a superheat signal and a superheat setpoint to generate an error signal, wherein the superheat signal indicates suction superheat values of a compressor. A comparison module is 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 is configured to compare a first count value to a second predetermined threshold to generate a second comparison signal. The first count value is generated based on at least one comparison between the superheat signal and the superheat setpoint. A setpoint module is configured to adjust the superheat setpoint based on the first comparison signal and the second comparison signal.

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Patent Owner(s)

  • LIEBERT CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dolcich, Benedict J Westerville, US 17 203
Judge, John F Galena, US 26 556
Lin, Zhiyong Dublin, US 50 208
Lu, Zongtao Pittsburgh, US 8 181
Ward, Craig Dublin, US 4 29

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