Dishwasher and control method therefor

Abstract

A dishwasher according to an embodiment includes a tub; a door for covering the opening of the tub; a door-driving unit for driving the door; a temperature sensor for detecting the internal temperature of the tub; a drying device for supplying heated air into the tub; and a control unit for controlling the door-driving unit, the temperature sensor and the drying device, wherein the control unit operates the drying device in order to perform drying, and controls the door-driving unit so as to perform a door opening/closing operation at least once on the basis of whether the internal temperature of the tub reaches multiple preset temperatures during drying.

1 . A dishwasher comprising:
 a tub having an opening;   a door configured to open and close to thereby open and close the opening of the tub, respectively;   a door driver configured to drive the door to open and close;   a temperature sensor configured to detect temperature in the tub;   a drying device configured to supply heated air into the tub; and   a controller configured to:
 operate the drying device to supply heated air into the tub to perform a drying process, and 
 based on whether the temperature in the tub detected by the temperature sensor reaches a plurality of preset temperatures during the drying process, control the door driver to, at least one time, drive the door to open and then close. 
   
     
     
         2 . The dishwasher of  claim 1 , wherein the controller is configured to:
 control the door driver to drive the door to perform a first opening of the door based on the temperature in the tub detected by the temperature sensor decreasing to a preset first temperature after a start of the drying process, and   control the door driver to drive the door to perform second opening of the door based on the temperature in the tub detected by the temperature sensor increasing to a preset limit temperature after a first closing of the door.   
     
     
         3 . The dishwasher of  claim 2 , wherein the controller is configured to:
 control the door driver to drive the door to perform the first closing of the door based on the temperature in the tub detected by the temperature sensor decreasing to a preset second temperature lower than the preset first temperature after the first opening of the door.   
     
     
         4 . The dishwasher of  claim 3 , wherein the controller is configured to:
 identify a remaining dry time of the drying process based on the first closing of the door,   control the door driver to drive the door to perform the second opening of the door based further on the remaining dry time of the drying process being longer than or equal to a preset threshold time, and   control the door driver to drive the door to perform a second closing of the door based on the temperature in the tub detected by the temperature sensor decreasing to a preset third temperature lower than the preset limit temperature after the second opening of the door.   
     
     
         5 . The dishwasher of  claim 4 , wherein the controller is configured to:
 set the preset limit temperature to be lower than the preset first temperature and higher than the preset second temperature, and   set the preset third temperature to be lower than the preset second temperature.   
     
     
         6 . The dishwasher of  claim 1 , wherein the controller is configured to:
 control the door driver to drive the door to perform a first opening of the door based on the temperature in the tub detected by the temperature sensor decreasing to a preset first temperature after a start of the drying process, and   control the door driver to drive the door to perform a first closing of the door based on a lapse of a preset first moisture discharge time after the first opening of the door.   
     
     
         7 . The dishwasher of  claim 6 , wherein the controller is configured to:
 identify a remaining dry time of the drying process based on the first closing of the door,   control the door driver to drive the door to perform a second opening of the door based on the remaining dry time of the drying process being longer than or equal to a preset threshold time and the temperature in the tub detected by the temperature sensor increasing to a preset limit temperature, and   control the door driver to drive the door to perform a second closing of the door based on a lapse of a preset second moisture discharge time after the second opening of the door.   
     
     
         8 . The dishwasher of  claim 7 , wherein the controller is configured to:
 set the preset first moisture discharge time and the preset second moisture discharge time differently.   
     
     
         9 . The dishwasher of  claim 1 , wherein the drying device includes:
 a fan configured to move air, and   a heater configured to heat air brought into the drying device,   wherein the controller is configured to stop operation of the heater and continue to operate the fan in response to the door being opened.   
     
     
         10 . The dishwasher of  claim 2 , wherein the controller is configured to:
 identify a remaining dry time of the drying process based on the first closing of the door, and   determine to omit the second opening of the door based on the remaining dry time of the drying process being shorter than a preset threshold time.   
     
     
         11 . A method of controlling a dishwasher that includes a tub having an opening, a door configured to open and close to thereby respectively open and close the opening, a door driver configured to drive the door to open and close, a temperature sensor configured to detect temperature in the tub, and a drying device configured to supply heated air into the tub, the method comprising:
 operating the drying device to supply heated air into the tub to perform a drying process;   detecting temperature in the tub with the temperature sensor while the drying process is performed; and,   based on whether the detected temperature reaches a preset plurality of temperatures during the drying process, controlling the door driver to drive the door to, at least one time, open and then close.   
     
     
         12 . The method of  claim 11 , wherein the controlling of the door driver includes:
 controlling the door driver to drive the door to perform a first opening of the door based on the detected temperature decreasing to a preset first temperature after a start of the drying process; and   controlling the door driver to drive the door to perform a second opening of the door based on the detected temperature increasing to a preset limit temperature after a first closing of the door.   
     
     
         13 . The method of  claim 12 , wherein the first closing of the door is performed based on the detected temperature decreasing to a preset second temperature lower than the preset first temperature after the first opening of the door. 
     
     
         14 . The method of  claim 13 , wherein the controlling of the door driver includes:
 identifying a remaining dry time of the drying process based on the first closing of the door;   controlling the door driver to drive the door to perform the second opening of the door based further on the remaining dry time of the drying process being longer than or equal to a preset threshold time; and   controlling the door driver to drive the door to perform a second closing of the door based on the detected temperature decreasing to a preset third temperature lower than the preset limit temperature after the second opening of the door.   
     
     
         15 . The method of  claim 14 , wherein the preset limit temperature is lower than the preset first temperature and higher than the preset second temperature, and the preset third temperature is lower than the preset second temperature.