# US 12,215,882 B2 · Air conditioner system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,882 B2 - Document ID: US12215882B2 - Status: Granted - Kind: B2 - Application number: 17/471,847 - Filed: 2021-09-10 - Published: 2021-12-30 - Granted: 2025-02-04 - Earliest claimed: 2019-04-22 - Assignees: Daikin Industries, Ltd. - Applicants: Daikin Industries, Ltd. - Inventors: Youko Sakata; Shouta Hori; Satoshi Hashimoto - Web page: https://patentgrep.com/patent/US12215882B2 ## CPC - F24F 11/67: Switching between heating and cooling modes - F24F 11/65: for selecting an operating mode - F24F 11/80: for controlling the temperature of the supplied air - F24F 11/81: by controlling the air supply to heat-exchangers or bypass channels - F24F 11/86: by controlling compressors within refrigeration or heat pump circuits - G05D 23/1919: {characterised by the type of controller} - F24F 2110/10: Temperature - F24F 2110/12: of the outside air - F24F 2110/20: Humidity - F24F 2110/22: of the outside air - F24F 2110/70: Carbon dioxide - F24F 2130/30: Artificial light - 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) - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract An air conditioner system (1) runs in a concentration keeping mode to sequentially repeat a first operation of lowering a target temperature to a first target temperature lower than a predetermined reference temperature and a second operation of raising the target temperature to a second target temperature higher than the reference temperature. The target temperature is gradually raised from the first target temperature to the second target temperature in the second operation. Lowering the target temperature to the first target temperature in the first operation takes shorter time than raising the target temperature to the second target temperature in the second operation. ## Claims ### Claim 1 An air conditioner system, comprising: a temperature regulator configured to regulate a temperature of an indoor air; an indoor air temperature detector configured to detect the temperature of the indoor air; and a control unit configured to set a target temperature based on a predetermined reference temperature and to control the temperature regulator so that the temperature detected by the indoor air temperature detector approaches the target temperature, wherein the control unit runs in a first mode to sequentially perform a first operation of lowering the target temperature to a first target temperature lower than the reference temperature and a second operation of raising the target temperature to a second target temperature higher than the reference temperature, each at least once, and in the first operation, the control unit lowers the target temperature to the first target temperature in a shorter time than a time when the target temperature is raised to the second target temperature in the second operation, to decrease the temperature detected by the indoor air temperature detector toward the first target temperature over a first predetermined period, and in the second operation, in order for the first operation to give a cool stimulus to a user and prevent the user from feeling drowsy, the control unit gradually raises the target temperature from the first target temperature to the second target temperature, to increase the temperature detected by the indoor air temperature detector toward the second target temperature over a second predetermined period longer than the first predetermined period. ### Claim 2 (depends on 1) The air conditioner system of claim 1, wherein the temperature regulator is configured as an indoor heat exchanger connected to a refrigerant circuit, and the control unit runs in the first mode in a cooling operation in which the indoor heat exchanger functions as an evaporator, and stops the indoor heat exchanger when the temperature detected by the indoor air temperature detector falls below the target temperature by a predetermined temperature or more. ### Claim 3 (depends on 1) The air conditioner system of claim 1, wherein the temperature regulator is configured as an indoor heat exchanger connected to a refrigerant circuit, and the control unit runs in the first mode in a heating operation in which the indoor heat exchanger functions as a radiator, and stops the indoor heat exchanger when the temperature detected by the indoor air temperature detector exceeds the target temperature by a predetermined temperature or more. ### Claim 4 (depends on 1) The air conditioner system of claim 1, wherein the control unit estimates a comfortable temperature of the indoor air at which a person in the room feels comfortable, and the reference temperature is the comfortable temperature estimated by the control unit. ### Claim 5 (depends on 4) The air conditioner system of claim 4, wherein, the control unit estimates the comfortable temperature using a learned model generated based on a parameter related to environmental information including at least one of an indoor air temperature, an indoor air humidity, an indoor illuminance, an outdoor air temperature, or an outdoor air humidity, and a parameter related to a thermal sensation of the person in the room. ### Claim 6 (depends on 4) The air conditioner system of claim 4, further comprising: an outdoor air temperature detector configured to detect a temperature of an outdoor air; and a storage unit configured to store relationship information indicating a relationship between the comfortable temperature and the temperature of the outdoor air, wherein the control unit estimates the comfortable temperature based on the temperature of the outdoor air detected by the outdoor air temperature detector using the relationship information stored in the storage unit. ### Claim 7 (depends on 4) The air conditioner system of claim 4, further comprising: an input unit configured to receive information on an individual characteristic of the person in the room, wherein the control unit corrects the reference temperature in accordance with the information entered to the input unit. ### Claim 8 (depends on 1) The air conditioner system of claim 1, further comprising: an indoor unit having the temperature regulator, wherein the indoor air temperature detector is provided in a component separate from the indoor unit. ### Claim 9 (depends on 1) The air conditioner system of claim 1, wherein suppose the reference temperature is Ta and the target temperature is Ts, an integrated value of a temperature difference between the reference temperature and the target temperature (Ta−Ts) in a period performing the first operation is equal to an integrated value of a temperature difference between the target temperature and the reference temperature (Ts−Ta) in a period performing the second operation. ### Claim 10 (depends on 1) The air conditioner system of claim 1, further comprising: a ventilator that ventilates the room; and a carbon dioxide concentration detector configured to detect a carbon dioxide concentration in the room, wherein the control unit operates the ventilator when the carbon dioxide concentration detected by the carbon dioxide concentration detector is equal to or higher than a predetermined value. ### Claim 11 (depends on 2) The air conditioner system of claim 2, wherein the control unit estimates a comfortable temperature of the indoor air at which a person in the room feels comfortable, and the reference temperature is the comfortable temperature estimated by the control unit. ### Claim 12 (depends on 3) The air conditioner system of claim 3, wherein the control unit estimates a comfortable temperature of the indoor air at which a person in the room feels comfortable, and the reference temperature is the comfortable temperature estimated by the control unit. ### Claim 13 (depends on 5) The air conditioner system of claim 5, further comprising: an input unit configured to receive information on an individual characteristic of the person in the room, wherein the control unit corrects the reference temperature in accordance with the information entered to the input unit. ### Claim 14 (depends on 6) The air conditioner system of claim 6, further comprising: an input unit configured to receive information on an individual characteristic of the person in the room, wherein the control unit corrects the reference temperature in accordance with the information entered to the input unit. ### Claim 15 (depends on 4) The air conditioner system of claim 4, further comprising: an indoor unit having the temperature regulator, wherein the indoor air temperature detector is provided in a component separate from the indoor unit. ### Claim 16 (depends on 7) The air conditioner system of claim 7, further comprising: an indoor unit having the temperature regulator, wherein the indoor air temperature detector is provided in a component separate from the indoor unit. ### Claim 17 (depends on 2) The air conditioner system of claim 2, wherein suppose the reference temperature is Ta and the target temperature is Ts, an integrated value of a temperature difference between the reference temperature and the target temperature (Ta−Ts) in a period performing the first operation is equal to an integrated value of a temperature difference between the target temperature and the reference temperature (Ts−Ta) in a period performing the second operation. ### Claim 18 (depends on 3) The air conditioner system of claim 3, wherein suppose the reference temperature is Ta and the target temperature is Ts, an integrated value of a temperature difference between the reference temperature and the target temperature (Ta−Ts) in a period performing the first operation is equal to an integrated value of a temperature difference between the target temperature and the reference temperature (Ts−Ta) in a period performing the second operation. ### Claim 19 (depends on 4) The air conditioner system of claim 4, wherein suppose the reference temperature is Ta and the target temperature is Ts, an integrated value of a temperature difference between the reference temperature and the target temperature (Ta−Ts) in a period performing the first operation is equal to an integrated value of a temperature difference between the target temperature and the reference temperature (Ts−Ta) in a period performing the second operation. ### Claim 20 (depends on 7) The air conditioner system of claim 7, wherein suppose the reference temperature is Ta and the target temperature is Ts, an integrated value of a temperature difference between the reference temperature and the target temperature (Ta−Ts) in a period performing the first operation is equal to an integrated value of a temperature difference between the target temperature and the reference temperature (Ts−Ta) in a period performing the second operation.