# US 11,906,243 B2 · Refrigerator and method of controlling the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,243 B2 - Document ID: US11906243B2 - Status: Granted - Kind: B2 - Application number: 17/955,937 - Filed: 2022-09-29 - Published: 2023-01-26 - Granted: 2024-02-20 - Earliest claimed: 2017-07-05 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seunguk Ahn; Kyungseok Kim; Sunam Chae - Web page: https://patentgrep.com/patent/US11906243B2 ## CPC - F25D 29/00: Arrangement or mounting of control or safety devices - F25D 11/02: with cooling compartments at different temperatures - F25D 17/065: {with compartments at different temperatures} - F25D 17/067: {Evaporator fan units} - F25B 2600/0253: with variable speed - F25D 2600/06: Controlling according to a predetermined profile - F25D 2700/12: Sensors measuring the inside temperature - F25D 2700/122: of freezer compartments - Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating - F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B) - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A method of controlling a refrigerator that includes: operating a cool air supply means with a predetermined output; a controller determining the output of the cool air supply means based on a current temperature of a storage compartment sensed by a temperature sensor while the cool air supply means operates with the predetermined output; and the controller operating the cool air supply means with the determined output. The controller determines that the output of the cool air supply means is decreased or increased when an absolute value of a difference between a previous temperature and a current temperature of the storage compartment is equal to or greater than a first reference value, and wherein the output of the cool air supply means is decreased or increased again when the absolute value of the difference between a current temperature of the storage compartment sensed again after a predetermined time has elapses and the previous temperature of the storage compartment is equal to or greater than the first reference value. ## Claims ### Claim 1 A method of controlling a refrigerator, the method comprising: performing a preliminary operation, when the refrigerator is turned on or a defrosting operation is finished; operating a cool air supply means with a predetermined output value during the preliminary operation; determining whether a constant temperature control start condition is satisfied during the preliminary operation; operating the cool air supply means with a predetermined output when it is determined that the constant temperature control start condition is satisfied; a controller determining the output of the cool air supply means based on a difference between a current temperature of a storage compartment sensed by a temperature sensor and a previous temperature of the storage compartment while the cool air supply means operates with the predetermined output; and the controller operating the cool air supply means with the determined output. ### Claim 2 (depends on 1) The method of claim 1, wherein the controller determines that the output of the cool air supply means is decreased or increased when an absolute value of the difference between the previous temperature and a current temperature of the storage compartment is equal to or greater than a first reference value, and wherein the output of the cool air supply means is decreased or increased again when the absolute value of the difference between a current temperature of the storage compartment sensed again after a predetermined time has elapsed and the previous temperature of the storage compartment is equal to or greater than the first reference value. ### Claim 3 (depends on 2) The method of claim 2, wherein the controller determines that the output of the cool air supply means is decreased when the difference between the previous temperature and the current temperature of the storage compartment is greater than 0 and the absolute value of the difference between the previous temperature and the current temperature of the storage compartment is equal to or greater than the first reference value. ### Claim 4 (depends on 2) The method of claim 2, wherein the controller determines that the output of the cool air supply means is increased when the difference between the previous temperature and the current temperature of the storage compartment is less than 0 and the absolute value of the difference between the previous temperature and the current temperature of the storage compartment is equal to or greater than the first reference value. ### Claim 5 (depends on 2) The method of claim 2, wherein the controller determines that the output of the cool air supply means is maintained when the absolute value of the difference between the previous temperature and the current temperature of the storage compartment is less than the first reference value. ### Claim 6 (depends on 1) The method of claim 1, wherein the predetermined output value is a maximum value of the cool air supply means. ### Claim 7 (depends on 1) The method of claim 1, wherein during the preliminary operation of the refrigerator, when the temperature of the storage compartment becomes less than an off-reference temperature, the controller stops an operation of the cool air supply means, and then the controller determines whether the constant temperature control start condition is satisfied, when the constant temperature control start condition is satisfied, the controller performs constant temperature control. ### Claim 8 (depends on 1) The method of claim 1, wherein when the temperature of the storage compartment reaches a set temperature of the storage compartment, the controller determines that the constant temperature control start condition is satisfied. ### Claim 9 A method of controlling a refrigerator, the method comprising: performing a preliminary operation, when the refrigerator is turned on or a defrosting operation is finished; operating a cool air supply means with a predetermined output value during the preliminary operation; determining whether a constant temperature control start condition is satisfied during the preliminary operation; operating a cool air supply means with a predetermined output when it is determined that the constant temperature control start condition is satisfied; a controller determining the output of the cool air supply means based on a difference between a set temperature and a current temperature of a storage compartment sensed by a temperature sensor while the cool air supply means operates with the predetermined output; and the controller operating the cool air supply means with the determined output. ### Claim 10 (depends on 9) The method of claim 9, wherein the controller determines that the output of the cool air supply means is decreased or increased when an absolute value of a difference between the set temperature and the current temperature of the storage compartment is equal to or greater than a first reference value, and wherein the output of the cool air supply means is decreased or increased again when the absolute value of the difference between the set temperature and a current temperature of the storage compartment sensed again after a predetermined time has elapsed is equal to or greater than the first reference value. ### Claim 11 (depends on 10) The method of claim 10, wherein the first reference value includes a first upper limit reference value higher than the set temperature, and wherein, when the current temperature is higher than the set temperature and the absolute value of the difference between the set temperature and the current temperature exceeds the first upper limit reference value, the controller determines that the output of the cool air supply means is increased. ### Claim 12 (depends on 10) The method of claim 10, wherein the first reference value includes a first lower limit reference value lower than the set temperature, and wherein, when the current temperature is lower than the set temperature and the absolute value of the difference between the set temperature and the current temperature exceeds the first lower limit reference value, the controller determines that the output of the cool air supply means is decreased. ### Claim 13 (depends on 10) The method of claim 10, wherein the controller determines that the output of the cool air supply means is maintained when the absolute value of the difference between the set temperature and the current temperature of the storage compartment is less than the first reference value. ### Claim 14 (depends on 9) The method of claim 9, wherein the predetermined output value is a maximum value of the cool air supply means. ### Claim 15 (depends on 9) The method of claim 9, wherein during the preliminary operation of the refrigerator, when the temperature of the storage compartment becomes less than an off-reference temperature, the controller stops an operation of the cool air supply means, and then the controller determines whether the constant temperature control start condition is satisfied, when the constant temperature control start condition is satisfied, the controller performs constant temperature control. ### Claim 16 (depends on 9) The method of claim 9, wherein when the temperature of the storage compartment reaches the set temperature of the storage compartment, the controller determines that the constant temperature control start condition is satisfied. ### Claim 17 A method of controlling a refrigerator, the method comprising: operating a cool air supply means with a predetermined first output value; stopping the cool air supply means when a temperature of a storage compartment reaches an off-reference temperature lower than a set temperature of the storage compartment; a controller determining the output of the cool air supply means to a second output value lower than the predetermined first output value based on a current temperature of a storage compartment sensed by a temperature sensor when the temperature of the storage compartment reaches a predetermined temperature; and the controller operating the cool air supply means with the determined output. ### Claim 18 (depends on 17) The method of claim 17, wherein the predetermined first output value is a maximum output value. ### Claim 19 (depends on 17) The method of claim 17, wherein the predetermined temperature is the set temperature of the storage compartment. ### Claim 20 (depends on 17) The method of claim 17, wherein the controller determines that the second output value of the cool air supply means is decreased or increased when an absolute value of the difference between a previous temperature of the storage compartment and a current temperature of the storage compartment is equal to or greater than a first reference value, and wherein the second output value of the cool air supply means is decreased or increased again when the absolute value of the difference between a current temperature of the storage compartment sensed again after a predetermined time has elapsed and the previous temperature of the storage compartment is equal to or greater than the first reference value, or wherein the controller determines that the second output value of the cool air supply means is decreased or increased when an absolute value of a difference between the set temperature and the current temperature of the storage compartment is equal to or greater than a first reference value, and wherein the second output value of the cool air supply means is decreased or increased again when the absolute value of the difference between the set temperature and a current temperature of the storage compartment sensed again after a predetermined time has elapsed is equal to or greater than the first reference value.