Patent ID: 6073459
Filing Date: 2000-06-13
Classification: B60H,F25B

Abstract:
A refrigeration cycle control system comprising:a refrigeration cycle including a compressor for compressing a refrigerant, condensers for condensing the refrigerant discharged from said compressor, electric expansion valves for reducing the pressure of the refrigerant supplied from said condensers and an evaporator for evaporating the refrigerant supplied from said electric expansion valves;means for detecting the supercooling information relating to the supercooling degree of the liquid refrigerant in said condensers; andmeans for calculating the theoretical supercooling degree based on said supercooling information;wherein the valve opening degree of said electric expansion valves is set to a predetermined initial opening degree for a first predetermined length of time from the starting of said refrigeration cycle by driving said compressor;wherein said valve opening degree, is controlled so that said theoretical supercooling degree reaches a predetermined target supercooling degree after the lapse of said first predetermined length of time; andwherein said valve opening degree is reduced by a predetermined value in the case where the amount of change of said valve opening degree with respect to said initial opening degree is smaller than a predetermined value during a second predetermined length of time after the lapse of said first predetermined length of time.