Washing machine and method for controlling washing machine

Abstract

A washing machine that saves energy while maintaining washing performance according to a water temperature is provided. The washing machine includes a main body, a tub provided inside the main body, a first water supply device configured to supply washing water without detergent to the tub, a second water supply device configured to supply washing water containing detergent to the tub, a temperature sensor configured to detect a temperature of the washing water stored in the tub, a circulation bubble device configured to circulate the washing water stored in the tub or generate bubbles in the washing water stored in the tub, a circulation pump configured to supply the washing water stored in the tub to the circulation bubble device, memory storing one or more computer programs, and one or more processors communicatively coupled to the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to control the first water supply device to supply the washing water without detergent to the tub, and control a rotation speed of the circulation pump based on a temperature of the washing water without detergent.

What is claimed is: 
     
         1 . A washing machine comprising:
 a main body;   a tub provided inside the main body;   a first water supply device configured to supply washing water without detergent to the tub;   a second water supply device configured to supply washing water containing detergent to the tub;   a temperature sensor configured to detect a temperature of the washing water stored in the tub;   a circulation bubble device configured to circulate the washing water stored in the tub or generate bubbles in the washing water stored in the tub;   a circulation pump configured to supply the washing water stored in the tub to the circulation bubble device;   memory storing one or more computer programs; and   one or more processors communicatively coupled to the memory,   wherein the one or more computer programs include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to:
 control the first water supply device to supply the washing water without detergent to the tub, and 
 control a rotation speed of the circulation pump based on a temperature of the washing water without detergent. 
   
     
     
         2 . The washing machine of  claim 1 , wherein the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to:
 control the circulation pump to rotate at a first speed based on the temperature of the washing water without detergent being less than a preset temperature, and   control the circulation pump to rotate at a second speed lower than the first speed based on the temperature of the washing water without detergent being higher than the preset temperature.   
     
     
         3 . The washing machine of  claim 1 , further comprising:
 a heater configured to heat the washing water stored in the tub,   wherein the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to:
 operate the heater for a first preset time based on the temperature of the washing water without detergent being less than a preset temperature, and 
 operate the heater for a second preset time, or operate the heater until the temperature of the washing water stored in the tub reaches a target temperature, based on the temperature of the washing water without detergent being higher than the preset temperature. 
   
     
     
         4 . The washing machine of  claim 3 , wherein, in response to the temperature of the washing water without detergent being less than the preset temperature, the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to turn off the heater even in a case where the temperature of the washing water stored in the tub does not reach the target temperature. 
     
     
         5 . The washing machine of  claim 1 , wherein the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to:
 perform a weight detection process for detecting a weight of laundry and a material detection process for detecting a material of the laundry after controlling the first water supply device to supply the washing water without detergent to the tub, and   control the second water supply device to supply the washing water containing the detergent to the tub after performing the weight detection process and the material detection process.   
     
     
         6 . The washing machine of  claim 5 , wherein the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to control the rotation speed of the circulation pump based on the temperature of the washing water without detergent and the weight of the laundry. 
     
     
         7 . The washing machine of  claim 5 , wherein the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to determine an operation mode of the circulation bubble device based on the material of the laundry. 
     
     
         8 . The washing machine of  claim 7 , wherein the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to:
 control the circulation bubble device to circulate the washing water stored in the tub based on determining that the material of the laundry is a first material, and   control the circulation bubble device to generate bubbles in the washing water stored in the tub based on determining that the material of the laundry is a second material.   
     
     
         9 . The washing machine of  claim 1 , wherein the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to control the rotation speed of the circulation pump based on the temperature of the washing water without detergent, only in a case where a user input to start a first washing course is received. 
     
     
         10 . The washing machine of  claim 9 , further comprising:
 an output interface comprising at least one of a display or a speaker; and   a communication circuitry configured to receive weather information from a server,   wherein the one or more computer programs further include computer-executable instructions that, when executed by one or more processors individually or collectively, cause the washing machine to control the output interface to provide feedback recommending selection of the first washing course, based on the weather information satisfying a preset condition.   
     
     
         11 . A method for controlling a washing machine comprising a circulation bubble device configured to circulate washing water stored in a tub or generate bubbles in the washing water stored in the tub and a circulation pump configured to supply the washing water stored in the tub to the circulation bubble device, the method comprising:
 supplying washing water without detergent to the tub; and   controlling a rotation speed of the circulation pump based on a temperature of the washing water without detergent.   
     
     
         12 . The method of  claim 11 , wherein the controlling of the rotation speed of the circulation pump comprises:
 controlling the circulation pump to rotate at a first speed based on the temperature of the washing water without detergent being less than a preset temperature; and   controlling the circulation pump to rotate at a second speed lower than the first speed based on the temperature of the washing water without detergent being higher than the preset temperature.   
     
     
         13 . The method of  claim 11 , further comprising:
 operating a heater configured to heat the washing water stored in the tub for a first preset time based on the temperature of the washing water without detergent being less than a preset temperature; and   operating the heater for a second preset time, or operating the heater until a temperature of the washing water stored in the tub reaches a target temperature, based on the temperature of the washing water without detergent being higher than the preset temperature.   
     
     
         14 . The method of  claim 13 , wherein the operating of the heater for the first preset time comprises turning off the heater even in a case where the temperature of the washing water stored in the tub does not reach the target temperature. 
     
     
         15 . The method of  claim 11 , further comprising:
 performing a weight detection process for detecting a weight of laundry and a material detection process for detecting a material of the laundry after supplying the washing water without detergent to the tub; and   supplying the washing water containing detergent to the tub after performing the weight detection process and the material detection process.   
     
     
         16 . The method of  claim 15 , further comprising:
 controlling the rotation speed of the circulation pump based on the temperature of the washing water without detergent and the weight of the laundry.   
     
     
         17 . The method of  claim 15 , further comprising:
 determining an operation mode of the circulation bubble device based on the material of the laundry.   
     
     
         18 . The method of  claim 17 , further comprising:
 controlling the circulation bubble device to circulate the washing water stored in the tub based on determining that the material of the laundry is a first material, and   controlling the circulation bubble device to generate bubbles in the washing water stored in the tub based on determining that the material of the laundry is a second material.   
     
     
         19 . One or more non-transitory computer-readable storage media storing computer-executable instructions that, when executed by one or more processors of a washing machine individually or collectively, cause the washing machine to perform operations, the operations comprising:
 controlling a washing machine comprising a circulation bubble device configured to circulate washing water stored in a tub or generate bubbles in the washing water stored in the tub and a circulation pump configured to supply the washing water stored in the tub to the circulation bubble device;   supplying washing water without detergent to the tub; and   controlling a rotation speed of the circulation pump based on a temperature of the washing water without detergent.   
     
     
         20 . The one or more non-transitory computer-readable storage media of  claim 19 , wherein the controlling of the rotation speed of the circulation pump comprises:
 controlling the circulation pump to rotate at a first speed based on the temperature of the washing water without detergent being less than a preset temperature; and   controlling the circulation pump to rotate at a second speed lower than the first speed based on the temperature of the washing water without detergent being higher than the preset temperature.