Controlling apparatus and controlling method for mode change type refrigerating system

A controlling apparatus for a mode change type refrigerating system comprising:

• a variable capacity type gas compressor having a capacity changing means capable of changing a capacity of a compression chamber;
• an evaporator for delivering refrigerant drawn into the variable capacity type gas compressor;
• pressure detecting means for detecting a refrigerant pressure;
• pressure setting means for setting a target pressure;
• deviation calculating means for calculating deviation between the pressure setting means and the pressure detecting means;
• pressure controlling means provided with a plurality of control units, each of the control units commonly including a plurality of control elements, in which at least one control element among the plurality of the control element has a control element value that is different for each control unit, and first capacity control value is outputted as the result of the calculation based on the control element;
• control unit selecting means for selecting one control unit form among the plural control units, and for inputting the deviation calculated by the deviation calculating means to the selected control unit;
• means for detecting a number of rotation for detecting a number of rotation of the variable capacity type gas compressor or a number of rotation of a driving apparatus for driving the variable capacity type gas compressor;
• air flow amount setting means for setting the air flow amount of the fan;
• calculation means of speed revision including a plurality of calculation units of speed revision having mutually different speed revision characteristics and for outputting a second capacity control value as the result of the calculation;
• selecting means of calculation unit of speed revision for selecting one calculation unit of speed revision from among the plural calculation units of speed revision, and for inputting the rotation number detected by the means for detecting a rotation number to the calculation unit of speed revision;
• mode changing means for changing the control unit in the control unit selecting means and/or the calculation unit of speed revision in the selecting means of the calculation unit of speed revision, based on the target pressure set by the pressure setting means and the air flow amount set by the air flow amount setting means;
• and
• adding means for adding a first capacity control value and a second capacity control value, and for outputting the added value to the capacity changing means.

A controlling method for a controlling apparatus for a mode change type refrigerating system, the controlling apparatus comprising;

• a variable capacity type gas compressor having a capacity changing means capable of changing a capacity of a compression chamber;
• an evaporator for delivering refrigerant drawn into the variable capacity type gas compressor;
• a fan for cooling the evaporator;
• air flow amount setting means for setting the air flow amount of the fan;
• a plurality of control units including common plural control elements, in which at least one control element among the plurality of the control elements has a control element value that is different for each control unit;
• a plurality of calculation units of speed revision having mutually different speed revision characteristics;
• and
• means for detecting a number of rotation for detecting a number of rotation of the variable capacity type gas compressor or a number of rotation of a driving apparatus for driving the variable capacity type gas compressor,
• wherein the controlling method comprises the steps of:
• detecting an air temperature at the predetermined place desired for controlling temperature;
• calculating a deviation between the air temperature and a set target temperature;
• selecting one control unit from among the plural control units based on the target temperature and the air flow amount set by the air flow amount setting means;
• inputting the deviation to the control unit;
• outputting a first capacity control value obtained by the calculation;
• selecting one calculation unit of speed revision from among the plural calculation units of speed revision based on the target temperature and the air flow amount set by the air flow amount setting means;
• inputting a number of rotations detected by the means for detecting the number of rotations detected by the means for detecting the number or rotation into the calculation unit of speed revision;
• outputting a second capacity control value obtained by the calculation;
• adding the second capacity control value and the first capacity control value;
• and
• changing a capacity of the compression chamber based on the added value.