Fuzzy logic controlled cryogenic cooler

Details Fuzzy logic controlled cryogenic cooler Fuzzy logic controlled cryogenic cooler

1996-04-24

1998-03-31

Voeltz, Emanuel T.

Boots, shoes, and leggings

395 61, 395 76, 236 38B, 62112, F25B 700

Patent

active

057345937

ABSTRACT:
A fuzzy logic controller for a cryogenic system in which, for example, a cold tip cooling an infrared detector uses a Stirling cycle cooler-compressor with the helium coolant maintained at typically 78.degree. K. This temperature is maintained by a fuzzy logic controller which has as its inputs the temperature differential between the desired temperature and actual cold tip temperature, rate of change of such temperature, and especially for startup the difference between a maximum voltage which can be applied to the Stirling type cooler-compressor and the actual control voltage which is applied. Appropriate membership functions for all of the inputs are provided of the triangular type. And appropriate rules related to the operation of a Stirling cycle cooler provide for fuzzy outputs which with an output membership function are defuzzified to provide a control output signal which controls the final cooling power of the cooler-compressor.

REFERENCES:
patent: 5347615 (1994-09-01), Yamakawa et al.
patent: 5440891 (1995-08-01), Hindmon, Jr. et al.
patent: 5491775 (1996-02-01), Madau et al.

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