CONTROLLER FOR REFRIGERATION CYCLE

摘要

PROBLEM TO BE SOLVED: To provide a controller for a refrigeration cycle capable of properly controlling the valve travel of an expansion valve and restricting and avoiding unnecessary variation of pressure of the refrigeration cycle. SOLUTION: The valve travel of the expansion valve calculated on the basis of a target pressure calculated from temperature of a high pressure line and an actual pressure of the high pressure line is corrected on the basis of temperature difference between a target temperature of an evaporator and an actual temperature so that correction can be made in advance before variation in the refrigerant circulation quantity of the refrigeration cycle (discharge capacity of compressor) changing in response to the temperature difference of the evaporator occurs. Thus, response of the expansion valve to the variation of pressure of the high pressure line can be raised so that fluctuation in pressure of the refrigeration cycle can be stabilized in an early stage.