Control method for a self-powered cryogen based refrigeration system
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United States of America Patent
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Aug 26, 2003
Grant Date -
Jan 30, 2003
app pub date -
Jun 4, 2002
filing date -
Jun 4, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A method of temperature control in a cryogenic system, wherein the system includes a cryogenic tank. The method comprises providing a motor speed sensor which determines a motor speed, providing a pressure sensor which determines a cryogenic pressure, providing a temperature sensor in the conditioned space which measures a temperature within the conditioned space, providing a deprived integral region, and generating an overriding control signal at the proportional-integral-derivative controller when the temperature and the pressure are beyond a temperature set point and a pressure set point.
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