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In the thesis, the fuzzy controller is used to handle the
random variableon the products in the refrigeration storage,
which causes the problems with uncertain refrigeration load of
the refrigeration system, to improve the operating efficiency of
compressors, to save power, and to avoid that operating
compressors switch too often. For openers, the objects of the
study are intended for establishing the mathematical model of
the refrigeration system, and designing the fuzzy controller to
operate the ON/OFF cditions of the refrigerant control
electromagnetic of the evaporator in every storage. With the
function of a power saving, the fuzzy controller can regulate
thetotal refrigeration load appropriately, promote the value of
the coefficient of performance. In addition, the fuzzy
controller will do everything possible to prevent the
compressors from operation and switching for the conditioned
boundary set around. In this way, the compressors can be
maintained to start andstop as infrequent as possible.
Through the practice of computer simulation, we make a
comparison of the operation between the fuzzy electromagnetic
valve and the ordinary storage temperature upper-low limit
electromagnetic valve and know that the fuzzy controller
produces quite an effect on saving power needed by an operating
compressoras the refrigeration storage is lower than design
value. Furthermore, under any conditions, the operation
compressors to switch loss frequently. According the
traditional theories, if we have no ideas about the mathematical
model of the control system or ar not sure how to demonstrate
the dynamic behavior ofthe system with the precise mathematical
models, it usually gets us into trouble of designing
controllers. However, in some situations, we deices the fuzzy
controller simply out of practical use of language-stale rules
and experience and achieve our purpose as we experience and
achieve our purpose as we expect without any advanced estimation
of mathematical model in the system.
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