| 摘要 |
PROBLEM TO BE SOLVED: To achieve a refrigerating cycle apparatus, controlling a refrigerating cycle without an expensive pressure sensor, inexpensive, and having no possibility of leaking a refrigerant. SOLUTION: In this refrigerating cycle apparatus, the refrigerating cycle is formed by a compressor 501, a radiator 502 and an expander 503 having a power generator 507 and an evaporator 504. The apparatus includes: a power generator current detecting means 509 for detecting a current of the power generator 507; an evaporation temperature detection means 510 for detecting the evaporation temperature of the evaporator 504; a pressure estimation means 511 for estimating the high pressure of the refrigerating cycle based on the current of the power generator and the evaporation temperature; and an expander control means 508 for controlling the revolution of the expander 503 through the power generator according to the estimated pressure value estimated by the pressure estimation means 511. Thereby, the refrigerating cycle is controlled without using a pressure sensor. COPYRIGHT: (C)2008,JPO&INPIT
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