US-12618582-B2 - Air conditioner and control method thereof

Abstract

Some embodiments of the present disclosure provide an air conditioner and a control method thereof. The air conditioner includes an outdoor unit, an indoor unit, a temperature sensor, a humidity sensor, and a controller. The temperature sensor is configured to detect a first indoor temperature and a second indoor temperature. The humidity sensor is configured to detect a first indoor humidity and a second indoor humidity. The controller is configured to control the air conditioner to operate in a reheat dehumidification mode if it is determined that a first preset condition is satisfied, control the air conditioner to operate in a cooling mode if it is determined that the first preset condition is not satisfied, and control the air conditioner to enter a shutdown state if it is determined that one of a second preset condition and a third preset condition is satisfied.

Inventors

• Yulei Zhao
• Haibin Lu
• Heng Zhang
• Chen Dong
• Jia Peng
• Tingyu Li

Assignees

• Qingdao Hisense Hitachi Air-conditioning Systems Co., Ltd.

Dates

Publication Date

20260505

Application Date

20231012

Priority Date

20210707

Claims (20)

1. 1 . An air conditioner, comprising: an outdoor unit including a compressor configured to compress a refrigerant; an indoor unit including an indoor fan configured to supply air indoors; a temperature sensor configured to detect a first indoor temperature and a second indoor temperature; a humidity sensor configured to detect a first indoor humidity and a second indoor humidity; and a controller configured to: obtain the first indoor temperature, a first target temperature, the first indoor humidity, and a first target humidity at a first moment; control the air conditioner to operate in a reheat dehumidification mode if determining that a fifth preset condition is satisfied; wherein the reheat dehumidification mode refers to a mode that the air conditioner heats dehumidified cold air before sending the dehumidified cold air indoors; and control the air conditioner to operate in a cooling mode if determining that the fifth preset condition is not satisfied; the controller being further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode, obtain the second indoor temperature, the second indoor humidity, a second target temperature, and a second target humidity at a second moment; and control the air conditioner to enter a shutdown state if determining that one of a second preset condition and a third preset condition is satisfied; wherein the fifth preset condition includes that the first indoor temperature is less than or equal to a sum of the first target temperature and a first preset temperature, the first indoor temperature is greater than the first target temperature, and the first indoor humidity is greater than or equal to a difference between the first target humidity and a first preset humidity; the second preset condition includes that the second indoor temperature is outside a temperature range, an upper limit value of the temperature range is equal to a sum of the second target temperature and a second preset temperature, and a lower limit value of the temperature range is equal to a difference between the second target temperature and the second preset temperature; and the third preset condition includes that the second indoor temperature is within the temperature range, and the second indoor humidity is less than or equal to a difference between a second target humidity and a first preset humidity.
2. 2 . The air conditioner according to claim 1 , wherein the controller is further configured to: after controlling the air conditioner to operate in the cooling mode if determining that the fifth preset condition is not satisfied, control the air conditioner to operate in the reheat dehumidification mode if determining that a fourth preset condition is satisfied; wherein the fourth preset condition includes that the second indoor temperature is within a temperature range, and the second indoor humidity is greater than a sum of the second target humidity and the first preset humidity.
3. 3 . The air conditioner according to claim 1 , wherein the indoor unit further includes an indoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the fifth preset condition is satisfied, obtain a target temperature and a target humidity in a current cycle; determine a target evaporation temperature in the reheat dehumidification mode according to the target temperature and the target humidity in the current cycle; wherein the target evaporation temperature is a temperature that the indoor heat exchanger as an evaporator needs to reach; and adjust a rotational speed of the compressor according to the target evaporation temperature.
4. 4 . The air conditioner according to claim 3 , wherein a formula for calculating the target evaporation temperature is: Te 0= A×Ts−B−dTe; wherein Te0 is the target evaporation temperature, Ts is the target temperature, dTe is a third preset temperature, and A and B are constants determined according to the target humidity.
5. 5 . The air conditioner according to claim 2 , wherein the indoor unit further includes an indoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the fifth preset condition is satisfied, obtain a target temperature and a target humidity in a current cycle; determine a target evaporation temperature in the reheat dehumidification mode according to the target temperature and the target humidity in the current cycle; wherein the target evaporation temperature is a temperature that the indoor heat exchanger as an evaporator needs to reach; and adjust a rotational speed of the compressor according to the target evaporation temperature.
6. 6 . The air conditioner according to claim 1 , wherein the outdoor unit further includes an outdoor fan and an outdoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the fifth preset condition is satisfied, obtain a target temperature and an indoor temperature in a current cycle, and a target temperature and an indoor temperature in a previous cycle; and determine a rotational speed adjustment value of the outdoor fan according to the target temperature and the indoor temperature in the current cycle, and the target temperature and the indoor temperature in the previous cycle.
7. 7 . The air conditioner according to claim 2 , wherein the outdoor unit further includes an outdoor fan and an outdoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the fifth preset condition is satisfied, obtain a target temperature and an indoor temperature in a current cycle, and a target temperature and an indoor temperature in a previous cycle; and determine a rotational speed adjustment value of the outdoor fan according to the target temperature and the indoor temperature in the current cycle, and the target temperature and the indoor temperature in the previous cycle.
8. 8 . The air conditioner according to claim 3 , wherein the outdoor unit further includes an outdoor fan and an outdoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the fifth preset condition is satisfied, obtain a target temperature and an indoor temperature in a current cycle, and a target temperature and an indoor temperature in a previous cycle; and determine a rotational speed adjustment value of the outdoor fan according to the target temperature and the indoor temperature in the current cycle, and the target temperature and the indoor temperature in the previous cycle.
9. 9 . A control method of an air conditioner, applied to the air conditioner according to claim 1 , wherein the control method comprises: obtaining the first indoor temperature, a first target temperature, the first indoor humidity, and a first target humidity at a first moment; controlling the air conditioner to operate in a reheat dehumidification mode if determining that a fifth preset condition is satisfied; wherein the reheat dehumidification mode refers to a mode that the air conditioner heats dehumidified cold air before sending the dehumidified cold air indoors; and controlling the air conditioner to operate in a cooling mode if determining that the fifth preset condition is not satisfied; wherein the fifth preset condition includes that the first indoor temperature is less than or equal to a sum of the first target temperature and a first preset temperature, the first indoor temperature is greater than the first target temperature, and the first indoor humidity is greater than or equal to a difference between the first target humidity and a first preset humidity; the control method further comprises: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that a fifth preset condition is satisfied, obtaining a target temperature and a target humidity in a current cycle; determining a target evaporation temperature in the reheat dehumidification mode according to the target temperature and the target humidity in the current cycle; wherein the target evaporation temperature is a temperature that the indoor heat exchanger as an evaporator needs to reach; and adjusting a rotational speed of the compressor according to the target evaporation temperature.
10. 10 . The control method according to claim 9 , wherein the control method further comprises: after controlling the air conditioner to operate in the reheat dehumidification mode, obtaining the second indoor temperature, the second indoor humidity, a second target temperature, and a second target humidity at a second moment; controlling the air conditioner to enter a shutdown state if determining that one of a second preset condition and a third preset condition is satisfied; and controlling the air conditioner to continue to operate in the reheat dehumidification mode if determining that a fourth preset condition is satisfied; wherein the second preset condition includes that the second indoor temperature is outside a temperature range, an upper limit value of the temperature range is equal to a sum of the second target temperature and a second preset temperature, and a lower limit value of the temperature range is equal to a difference between the second target temperature and the second preset temperature; the third preset condition includes that the second indoor temperature is within the temperature range, and the second indoor humidity is less than or equal to a difference between the second target humidity and the first preset humidity; and the fourth preset condition includes that the second indoor temperature is within the temperature range, and the second indoor humidity is greater than a sum of the second target humidity and the first preset humidity.
11. 11 . An air conditioner, comprising: an outdoor unit including a compressor configured to compress a refrigerant; an indoor unit including an indoor fan configured to supply air indoors; a temperature sensor configured to detect a first indoor temperature and a second indoor temperature; a humidity sensor configured to detect a first indoor humidity and a second indoor humidity; and a controller configured to: obtain the first indoor temperature and a first target temperature at a first moment; control the air conditioner to operate in a reheat dehumidification mode if determining that a first preset condition is satisfied; wherein the reheat dehumidification mode refers to a mode that the air conditioner heats dehumidified cold air before sending the dehumidified cold air indoors; and control the air conditioner to operate in a cooling mode if determining that the first preset condition is not satisfied; the controller being further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode, obtain the second indoor temperature and a second target temperature at a second moment; and control the air conditioner to enter a shutdown state if determining that one of a second preset condition and a third preset condition is satisfied; wherein the first preset condition includes that the first indoor temperature is less than or equal to a sum of the first target temperature and a first preset temperature, and the first indoor temperature is greater than the first target temperature; the second preset condition includes that the second indoor temperature is outside a temperature range, an upper limit value of the temperature range is equal to a sum of the second target temperature and a second preset temperature, and a lower limit value of the temperature range is equal to a difference between the second target temperature and the second preset temperature; and the third preset condition includes that the second indoor temperature is within the temperature range, and the second indoor humidity is less than or equal to a difference between a second target humidity and a first preset humidity.
12. 12 . The air conditioner according to claim 11 , wherein the controller is further configured to: after controlling the air conditioner to operate in the cooling mode if determining that the first preset condition is not satisfied, control the air conditioner to operate in the reheat dehumidification mode if determining that a fourth preset condition is satisfied; wherein the fourth preset condition includes that the second indoor temperature is within the temperature range.
13. 13 . The air conditioner according to claim 11 , wherein the indoor unit further includes an indoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the first preset condition is satisfied, obtain a target temperature and a target humidity in a current cycle; determine a target evaporation temperature in the reheat dehumidification mode according to the target temperature and the target humidity in the current cycle; wherein the target evaporation temperature is a temperature that the indoor heat exchanger as an evaporator needs to reach; and adjust a rotational speed of the compressor according to the target evaporation temperature.
14. 14 . The air conditioner according to claim 13 , wherein a formula for calculating the target evaporation temperature is: Te 0= A×Ts−B−dTe; wherein Te0 is the target evaporation temperature, Ts is the target temperature, dTe is a third preset temperature, and A and B are constants determined according to the target humidity.
15. 15 . The air conditioner according to claim 12 , wherein the indoor unit further includes an indoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the first preset condition is satisfied, obtain a target temperature and a target humidity in a current cycle; determine a target evaporation temperature in the reheat dehumidification mode according to the target temperature and the target humidity in the current cycle; wherein the target evaporation temperature is a temperature that the indoor heat exchanger as an evaporator needs to reach; and adjust a rotational speed of the compressor according to the target evaporation temperature.
16. 16 . The air conditioner according to claim 11 , wherein the outdoor unit further includes an outdoor fan and an outdoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the first preset condition is satisfied, obtain a target temperature and an indoor temperature in a current cycle, and a target temperature and an indoor temperature in a previous cycle; and determine a rotational speed adjustment value of the outdoor fan according to the target temperature and the indoor temperature in the current cycle, and the target temperature and the indoor temperature in the previous cycle.
17. 17 . The air conditioner according to claim 12 , wherein the outdoor unit further includes an outdoor fan and an outdoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the first preset condition is satisfied, obtain a target temperature and an indoor temperature in a current cycle, and a target temperature and an indoor temperature in a previous cycle; and determine a rotational speed adjustment value of the outdoor fan according to the target temperature and the indoor temperature in the current cycle, and the target temperature and the indoor temperature in the previous cycle.
18. 18 . The air conditioner according to claim 13 , wherein the outdoor unit further includes an outdoor fan and an outdoor heat exchanger; the controller is further configured to: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that the first preset condition is satisfied, obtain a target temperature and an indoor temperature in a current cycle, and a target temperature and an indoor temperature in a previous cycle; and determine a rotational speed adjustment value of the outdoor fan according to the target temperature and the indoor temperature in the current cycle, and the target temperature and the indoor temperature in the previous cycle.
19. 19 . A control method of an air conditioner, wherein the air conditioner includes: an outdoor unit including a compressor configured to compress a refrigerant; an indoor unit including an indoor fan configured to supply air indoors; a temperature sensor configured to detect a first indoor temperature and a second indoor temperature: a humidity sensor configured to detect a first indoor humidity and a second indoor humidity; and a controller coupled to the compressor, the indoor fan, the temperature sensor, and the humidity sensor; the control method comprises: obtaining the first indoor temperature and a first target temperature at a first moment; controlling the air conditioner to operate in a reheat dehumidification mode if determining that a first preset condition is satisfied; wherein the reheat dehumidification mode refers to a mode that the air conditioner heats dehumidified cold air before sending the dehumidified cold air indoors; and controlling the air conditioner to operate in a cooling mode if determining that the first preset condition is not satisfied; wherein the first preset condition includes that the first indoor temperature is less than or equal to a sum of the first target temperature and a first preset temperature, and the first indoor temperature is greater than the first target temperature; the control method further comprises: after controlling the air conditioner to operate in the reheat dehumidification mode if determining that a first preset condition is satisfied, obtaining a target temperature and a target humidity in a current cycle; determining a target evaporation temperature in the reheat dehumidification mode according to the target temperature and the target humidity in the current cycle; wherein the target evaporation temperature is a temperature that the indoor heat exchanger as an evaporator needs to reach; and adjusting a rotational speed of the compressor according to the target evaporation temperature.
20. 20 . The control method according to claim 19 , wherein the control method further comprises: after controlling the air conditioner to operate in the reheat dehumidification mode, obtaining the second indoor temperature and the second indoor humidity at a second moment; controlling the air conditioner to enter a shutdown state if determining that one of a second preset condition and a third preset condition is satisfied; and controlling the air conditioner to continue to operate in the reheat dehumidification mode if determining that a fourth preset condition is satisfied: wherein the second preset condition includes that the second indoor temperature is outside a temperature range, an upper limit value of the temperature range is equal to a sum of a second target temperature and a second preset temperature, and a lower limit value of the temperature range is equal to a difference between the second target temperature and the second preset temperature: the third preset condition includes that the second indoor temperature is within the temperature range, and the second indoor humidity is less than or equal to a difference between a second target humidity and a first preset humidity; and the fourth preset condition includes that the second indoor temperature is within the temperature range.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation application of International Application No. PCT/CN2021/138239, filed on Dec. 15, 2021, which claims priority to Chinese Patent Application No. 202110768135.2, filed on Jul. 7, 2021, which are incorporated herein by reference in their entirety. TECHNICAL FIELD The present disclosure relates to the field of air conditioning technologies, and in particular, to an air conditioner and a control method thereof. BACKGROUND A humid environment may harm health of human body and may cause damage to furniture, appliances, and clothing. In a case where an air conditioner is operating in a reheat dehumidification mode, that is, the air conditioner heats dehumidified cold air and then sends it indoors, so that an indoor temperature is usually lower than a target temperature, resulting in low user comfort. SUMMARY In an aspect, an air conditioner is provided. The air conditioner includes an outdoor unit, an indoor unit, a temperature sensor, a humidity sensor, and a controller. The outdoor unit includes a compressor. The compressor is configured to compress a refrigerant. The indoor unit includes an indoor fan. The indoor fan is configured to supply air indoors. The temperature sensor is configured to detect a first indoor temperature and a second indoor temperature. The humidity sensor is configured to detect a first indoor humidity and a second indoor humidity. The controller is configured to obtain the first indoor temperature, a first target temperature, the first indoor humidity, and a first target humidity at a first moment, control the air conditioner to operate in a reheat dehumidification mode if it is determined that a fifth preset condition is satisfied, and control the air conditioner to operate in a cooling mode if it is determined that the fifth preset condition is not satisfied. The reheat dehumidification mode refers to a mode that the air conditioner heats dehumidified cold air before sending the dehumidified cold air indoors. The controller is further configured to, after controlling the air conditioner to operate in the reheat dehumidification mode, obtain the second indoor temperature, the second indoor humidity, a second target temperature, and a second target humidity at a second moment, the second moment is after the first moment, and control the air conditioner to enter a shutdown state if it is determined that one of a second preset condition and a third preset condition is satisfied. The fifth preset condition includes that the first indoor temperature is less than or equal to a sum of the first target temperature and a first preset temperature, the first indoor temperature is greater than the first target temperature, and the first indoor humidity is greater than or equal to a difference between the first target humidity and a first preset humidity. The second preset condition includes that the second indoor temperature is outside a temperature range, an upper limit value of the temperature range is equal to a sum of the second target temperature and a second preset temperature, and a lower limit value of the temperature range is equal to a difference between the second target temperature and the second preset temperature. The third preset condition includes that the second indoor temperature is within the temperature range, and the second indoor humidity is less than or equal to a difference between a second target humidity and a first preset humidity. In another aspect, a control method of an air conditioner is provided. The control method is applied to an air conditioner according to any one of the above embodiments. The control method includes that obtaining the first indoor temperature, a first target temperature, the first indoor humidity, and a first target humidity at a first moment, controlling the air conditioner to operate in a reheat dehumidification mode if it is determined that a fifth preset condition is satisfied, and controlling the air conditioner to operate in a cooling mode if it is determined that the fifth preset condition is not satisfied. The reheat dehumidification mode refers to a mode that the air conditioner heats dehumidified cold air before sending the dehumidified cold air indoors. The fifth preset condition includes that the first indoor temperature is less than or equal to a sum of the first target temperature and a first preset temperature, the first indoor temperature is greater than the first target temperature, and the first indoor humidity is greater than or equal to a difference between the first target humidity and a first preset humidity. The control method further includes that after controlling the air conditioner to operate in a reheat dehumidification mode if it is determined that a fifth preset condition is satisfied, obtaining a target temperature and a target humidity in a current cycle, determining a target evaporation temperature in the reheat dehumidification mode accord