# US 11,898,767 B2 · Air conditioner and a method for controlling an air conditioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,767 B2 - Document ID: US11898767B2 - Status: Granted - Kind: B2 - Application number: 17/172,477 - Filed: 2021-02-10 - Published: 2021-08-26 - Granted: 2024-02-13 - Earliest claimed: 2020-02-20 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Ji Hyun Jang; Donghwal Lee; Bohee Park; Sungho Seo; Hyunjin Park - Web page: https://patentgrep.com/patent/US11898767B2 ## CPC - F24F 11/63: Electronic processing - F24F 1/027: mounted in wall openings, e.g. in windows - F24F 11/64: using pre-stored data - F24F 11/65: for selecting an operating mode - F24F 11/77: by controlling the speed of ventilators - F24F 11/52: Indication arrangements, e.g. displays - F24F 2110/10: Temperature - F24F 2120/20: Feedback from users - Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract An air conditioner and a method for controlling an air conditioner are provided capable of minimizing noise generation. The air conditioner may include an indoor motor configured to drive a fan to blow indoor air and an outdoor motor configured to drive a fan to blow outdoor air. In addition, the air conditioner may include a controller configured to set a rotational speed of the indoor motor to drive a fan to blow indoor air based on operation modes and a maximum rotational speed of the outdoor motor to drive a fan to blow outdoor air and change a rotational speed of the outdoor motor within a range not exceeding the maximum rotational speed based on indoor environment information and a user-set value. ## Claims ### Claim 1 An air conditioner, comprising: a base; an indoor fan disposed on the base and configured to blow indoor air; an indoor motor disposed on the base and configured to drive the indoor fan; an outdoor fan disposed on the base and configured to blow outdoor air; an outdoor motor disposed on the base and configured to drive the outdoor fan; and a controller configured to control the indoor motor and the outdoor motor based on indoor environment information and a user-set value, wherein the controller is configured to: set a rotational speed of the indoor motor and a maximum rotational speed of the outdoor motor based on each of a plurality of user-set operation modes of the air conditioner and control the indoor motor to rotate at the rotational speed and control the rotational speed of the outdoor motor not to exceed the maximum rotational speed, and wherein the operation mode of the air conditioner comprises a super-low mode, a low mode, an intermediate mode, and a high mode, and wherein the controller is configured to: when the operation mode of the air conditioner is the super-low mode, set the rotational speed of the indoor motor to rotate the indoor fan at a first indoor fan speed and set the maximum rotational speed of the outdoor motor to adjust a maximum rotational speed of the outdoor fan to be a first outdoor fan speed: when the operation mode of the air conditioner is the low mode, set the rotational speed of the indoor motor to rotate the indoor fan at a second indoor fan speed, which is greater than the first indoor fan speed, and set the maximum rotational speed of the outdoor motor to adjust the maximum rotational speed of the outdoor fan to be a second outdoor fan speed, which is greater than the first outdoor fan speed; when the operation mode of the air conditioner is the intermediate mode, set the rotational speed of the indoor motor to rotate the indoor fan at a third indoor fan speed, which is greater than the second indoor fan speed, and set the maximum rotational speed of the outdoor motor to adjust the maximum rotational speed of the outdoor fan to be a third outdoor fan speed, which is greater than the second outdoor fan speed; and when the operation mode of the air conditioner is the high mode, set the rotational speed of the indoor motor to rotate the indoor fan at a fourth indoor fan speed, which is greater than the third indoor fan speed, and set the maximum rotational speed of the outdoor motor to adjust the maximum rotational speed of the outdoor fan to a fourth outdoor fan speed, which is greater than the third outdoor fan speed, and wherein the first indoor fan speed is greater than the first outdoor fan speed, the second indoor fan speed is the same as the second outdoor fan speed, the third indoor fan speed is less than the third outdoor fan speed, and the fourth indoor fan speed is less than the fourth outdoor fan speed. ### Claim 2 (depends on 1) The air conditioner of claim 1, further comprising: an evaporator disposed in front of the indoor fan; a compressor configured to receive refrigerant discharged from the evaporator; and a condenser disposed behind the outdoor fan and configured to receive the refrigerant discharged from the compressor and discharge the refrigerant to the evaporator. ### Claim 3 (depends on 2) The air conditioner of claim 2, wherein the indoor environment information includes an indoor temperature and the user-set value includes a set temperature level, and wherein the controller is configured to: adjust a rotational speed of the outdoor motor and an operating frequency of the compressor based on a difference between the indoor temperature and the set temperature; and control the rotational speed of the outdoor motor not to exceed the maximum rotational speed. ### Claim 4 (depends on 1) The air conditioner of claim 1, wherein the indoor fan is a cross-flow fan and the outdoor fan is an axial-flow fan. ### Claim 5 (depends on 1) The air conditioner of claim 1, wherein the rotational speed for the indoor motor is set according to the operation mode of the air conditioner. ### Claim 6 (depends on 1) The air conditioner of claim 1, wherein a difference between the third indoor fan speed and the third outdoor fan speed is greater than a difference between the fourth indoor fan speed and the fourth outdoor fan speed. ### Claim 7 (depends on 1) The air conditioner of claim 1, further comprising an interface configured to receive input of the operation mode of the air conditioner and the user-set value and display operation information of the air conditioner. ### Claim 8 (depends on 1) The air conditioner of claim 1, further comprising a memory configured to store the rotational speed of the indoor motor in each of the operation modes and the maximum rotational speed of the outdoor motor in each of the operation modes, wherein the controller is configured to access the memory and set the rotational speed of the indoor motor and the maximum rotational speed of the outdoor motor based on each of the operation modes. ### Claim 9 A method for controlling an air conditioner, the air conditioner comprising a base, an indoor fan disposed on the base and configured to blow indoor air, an indoor motor disposed on the base and configured to drive the indoor fan, an outdoor fan disposed on the base and configured to blow outdoor air, an outdoor motor disposed on the base and configured to drive the outdoor fan, and a controller configured to control the indoor motor and the outdoor motor, the method comprising: determining, by the controller, a user-set operation mode of the air conditioner; setting, by the controller, a rotational speed of the indoor motor and a maximum rotational speed of the outdoor motor based on each of the operation modes of the air conditioner; and controlling, by the controller, the indoor motor to rotate at the rotational speed, changing a rotational speed of the outdoor motor based on indoor environment information and a user-set value and controlling the rotational speed of the outdoor motor not to exceed the maximum rotational speed, and wherein the setting comprises: when the operation mode of the air conditioner comprising a super-low mode, a low mode, an intermediate mode, and a high node is the super-low mode, setting the rotational speed of the indoor motor to rotate the indoor fan at a first indoor fan speed and setting a maximum rotational speed of the outdoor motor to adjust a maximum rotational speed of the outdoor fan to be a first outdoor fan speed; when the operation mode of the air conditioner is the low mode, setting the rotational speed of the indoor motor to rotate the indoor fan at a second indoor fan speed, which is greater than the first indoor fan speed, and setting the maximum rotational speed of the outdoor motor to adjust the maximum rotational speed of the outdoor fan to be a second outdoor fan speed, which is greater than the first outdoor fan speed; when the operation mode of the air conditioner is the intermediate mode, setting the rotational speed of the indoor motor to rotate the indoor fan at a third indoor fan speed, which is greater than the second indoor fan speed, and setting the maximum rotational speed of the outdoor motor to adjust the maximum rotational speed of the outdoor fan to be a third outdoor fan speed, which is greater than the second outdoor fan speed; and when the operation mode of the air conditioner is the high mode, setting the rotational speed of the indoor motor to rotate the indoor fan at a fourth indoor fan speed, which is greater than the third indoor fan speed, and setting the maximum rotational speed of the outdoor motor to adjust the maximum rotational speed of the outdoor fan to be a fourth outdoor fan speed, which is greater than the third outdoor fan speed, and wherein the first indoor fan speed is greater than the first outdoor fan speed, the second indoor fan speed is the same as the second outdoor fan speed, the third indoor fan speed is less than the third outdoor fan speed, and the fourth indoor fan speed is less than the fourth outdoor fan speed. ### Claim 10 (depends on 9) The method of claim 9, wherein the air conditioner further comprises an evaporator disposed in front of the indoor fan, a compressor configured to introduce refrigerant discharged from the evaporator, and a compressor disposed behind the outdoor fan and configured to introduce the refrigerant discharged from the compressor and discharge the refrigerant to the evaporator, and wherein the controlling comprises: adjusting an operating frequency of the compressor based on a difference between an indoor temperature and a set temperature; and adjusting a rotational speed of the outdoor motor based on the difference between the indoor temperature and the set temperature, wherein the indoor environment information includes the indoor temperature and the user-set value includes the set temperature. ### Claim 11 (depends on 9) The method of claim 9, wherein a difference between the third indoor fan speed and the third outdoor fan speed is greater than a difference between the fourth indoor fan speed and the fourth outdoor fan speed. ### Claim 12 An air conditioner, comprising: a base; an evaporator fan disposed on the base and configured to blow indoor air; an evaporator fan motor disposed on the base and configured to drive the evaporator fan; an evaporator disposed in front of the evaporator fan; a compressor configured to receive refrigerant discharged from the evaporator; a condenser fan disposed on the base and configured to blow outdoor air; a condenser fan motor disposed on the base and configured to drive the condenser fan; a condenser disposed behind the condenser fan and configured to receive the refrigerant discharged from the compressor and discharge the refrigerant to the evaporator; and a controller configured to control the evaporator fan motor and the condenser fan motor based on an indoor temperature and a user-set temperature, wherein the controller is configured to: set a rotational speed of the evaporator fan motor and a maximum rotational speed of the condenser fan motor based on each of a plurality of user-set operation modes of the air conditioner and control the evaporator fan motor to rotate at the rotational speed and control the rotational speed of the condenser fan motor not to exceed the maximum rotational speed, and wherein the operation mode of the air conditioner comprises a super-low mode, a low mode, an intermediate mode, and a high mode, and wherein the controller is configured to: when the operation mode of the air conditioner is the super-low mode, set the rotational speed of the evaporator fan motor to rotate the evaporator fan at a first evaporator fan speed and set the maximum rotational speed of the condenser fan motor to adjust a maximum rotational speed of the condenser fan to be a first condenser fan speed; when the operation mode of the air conditioner is the low mode, set the rotational speed of the evaporator fan motor to rotate the evaporator fan at a second evaporator fan speed, which is greater than the first evaporator fan speed, and set the maximum rotational speed of the condenser fan motor to adjust the maximum rotational speed of the condenser fan to be a second condenser fan speed, which is greater than the first condenser fan speed; when the operation mode of the air conditioner is the intermediate mode, set the rotational speed of the evaporator fan motor to rotate the evaporator fan at a third evaporator fan speed, which is greater than the second evaporator fan speed, and set the maximum rotational speed of the condenser fan motor to adjust the maximum rotational speed of the condenser fan to be a third condenser fan speed, which is greater than the second condenser fan speed; and when the operation mode of the air conditioner is the high mode, set the rotational speed of the evaporator fan motor to rotate the evaporator fan at a fourth evaporator fan speed, which is greater than the third evaporator fan speed, and set the maximum rotational speed of the condenser fan motor to adjust the maximum rotational speed of the condenser fan to a fourth condenser fan speed, which is greater than the third condenser fan speed, and wherein the first evaporator fan speed is greater than the first condenser fan speed, the second evaporator fan speed is the same as the second condenser fan speed, the third evaporator fan speed is less than the third condenser fan speed, and the fourth evaporator fan speed is less than the fourth condenser fan speed. ### Claim 13 (depends on 12) The air conditioner of claim 12, wherein the controller is configured to: adjust a rotational speed of the condenser fan motor and an operating frequency of the compressor based on a difference between the indoor temperature and the user-set temperature; and control the rotational speed of the condenser fan motor not to exceed the maximum rotational speed. ### Claim 14 (depends on 12) The air conditioner of claim 12, wherein the evaporator fan is a cross-flow fan and the condenser fan is an axial-flow fan. ### Claim 15 (depends on 12) The air conditioner of claim 12, wherein the rotational speed for the evaporator fan motor is set according to the operation mode of the air conditioner, and the operation mode comprises at least four operation modes.