| 摘要 |
PROBLEM TO BE SOLVED: To attain a capacity control having a superior responding characteristic by a method wherein a pressure at a suction side is detected, a history of deviation between this pressure value and a predetermined target value is calculated, and there is provided a driving means for operating any one of a plurality of compressors at the number of steps corresponding to the value of history. SOLUTION: A microcomputer 10 samples a pressure value obtained from a low pressure sensor 9 converted it into a digital signal by an A/D converter 11, and calculates a deviation P between a target value of 2.5kg/cm<2> , for example, and the detected pressure value. A sum Q including this deviation P as well as deviations of last five times, for example. Then, the microcomputer 10 calculates the equation of X=αP+βQ (where,αandβare constants calculated in advance by experiment and they are a value such as 10). The microcomputer 10 reads out the corresponding number of steps stored in a memory 12 in reference to the calculated value of X and causes the compressor corresponding to the number of steps to be operated.
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