Air conditioner and controlling method thereof

Abstract

An air conditioner includes: an indoor unit including an indoor heat exchanger; an outdoor unit including a compressor configured to supply a refrigerant to the indoor heat exchanger; a pressure sensor configured to detect a pressure of the compressor; an indoor humidity sensor configured to detect an indoor humidity; an indoor temperature senor configured to detect an indoor temperature; and a controller comprising at least one processor, comprising processing circuitry, individually and/or collectively, configured to: periodically obtain a temperature difference between the indoor temperature and a desired temperature or a humidity difference between the indoor humidity and a reference humidity, adjust a target pressure of the compressor based on a first change amount of the temperature difference or a second change amount of the humidity difference, and adjust a frequency of the compressor in response to the target pressure being adjusted.

What is claimed is: 
     
         1 . An air conditioner, comprising:
 an indoor unit comprising an indoor heat exchanger;   an outdoor unit comprising a compressor configured to supply a refrigerant to the indoor heat exchanger;   a pressure sensor configured to detect a pressure of the compressor;   an indoor humidity sensor configured to detect an indoor humidity;   an indoor temperature senor configured to detect an indoor temperature; and   a controller comprising at least one processor, comprising processing circuitry, individually and/or collectively, configured to: periodically obtain a temperature difference between the indoor temperature and a desired temperature or a humidity difference between the indoor humidity and a reference humidity, adjust a target pressure of the compressor based on a first change amount of the temperature difference or a second change amount of the humidity difference, and adjust a frequency of the compressor in response to the target pressure being adjusted.   
     
     
         2 . The air conditioner of  claim 1 , further comprising:
 memory configured to store a fuzzy table including a plurality of adjustment values for the target pressure of the refrigerant,   wherein the controller is configured to determine an adjustment value of the target pressure using the fuzzy table.   
     
     
         3 . The air conditioner of  claim 2 , wherein the controller is configured to:
 determine the adjustment value of the target pressure corresponding to the temperature difference and the first change amount of the temperature difference or corresponding to the humidity difference and the second change amount of the humidity difference from the fuzzy table, and adjust the target pressure based on the adjustment value.   
     
     
         4 . The air conditioner of  claim 1 , wherein the controller is configured to: decrease the frequency of the compressor based on an increase in the target pressure, or increase the frequency of the compressor based on a decrease in the target pressure. 
     
     
         5 . The air conditioner of  claim 1 , wherein the controller is configured to:
 increase a rotation speed of an outdoor fan included in the outdoor unit and increase an opening degree of an expansion valve included in the indoor unit, based on an increase in the frequency of the compressor, or   decrease the rotation speed of the outdoor fan and decrease the opening degree of the expansion valve, based on a decrease in the frequency of the compressor.   
     
     
         6 . A method for controlling an air conditioner comprising an indoor unit including an indoor heat exchanger and an outdoor unit including a compressor configured to supply a refrigerant to the indoor heat exchanger, the method comprising:
 detecting an indoor humidity using an indoor humidity sensor included in the indoor unit;   detecting an indoor temperature using an indoor temperature sensor included in the indoor unit;   detecting a pressure of the compressor using a pressure sensor;   periodically obtaining a temperature difference between the indoor temperature and a desired temperature or a humidity difference between the indoor humidity and a reference humidity;   obtaining a first change amount of the temperature difference or a second change amount of the humidity difference;   adjusting a target pressure of the compressor based on the first change amount of the temperature difference or the second change amount of the humidity difference; and   adjusting a frequency of the compressor in response to the target pressure being adjusted.   
     
     
         7 . The method of  claim 6 , wherein the adjusting of the target pressure comprises determining an adjustment value of the target pressure using a fuzzy table including a plurality of adjustment values for the target pressure of the refrigerant stored in memory. 
     
     
         8 . The method of  claim 7 , wherein the adjusting of the target pressure comprises:
 determining the adjustment value of the target pressure corresponding to the temperature difference and the first change amount of the temperature difference or corresponding to the humidity difference and the second change amount of the humidity difference from the fuzzy table; and   adjusting the target pressure based on the adjustment value.   
     
     
         9 . The method of  claim 6 , wherein the adjusting of the frequency of the compressor comprises: decreasing the frequency of the compressor based on an increase in the target pressure, or increasing the frequency of the compressor based on a decrease in the target pressure. 
     
     
         10 . The method of  claim 6 , further comprising:
 increasing a rotation speed of an outdoor fan included in the outdoor unit and increasing an opening degree of an expansion valve included in the indoor unit, based on an increase in the frequency of the compressor; or   decreasing the rotation speed of the outdoor fan and decreasing the opening degree of the expansion valve, based on a decrease in the frequency of the compressor.