CN110848888B - Air conditioner, control method thereof and computer storage medium - Google Patents

Air conditioner, control method thereof and computer storage medium Download PDF

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Publication number
CN110848888B
CN110848888B CN201911212084.4A CN201911212084A CN110848888B CN 110848888 B CN110848888 B CN 110848888B CN 201911212084 A CN201911212084 A CN 201911212084A CN 110848888 B CN110848888 B CN 110848888B
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Prior art keywords
fan
heat exchanger
rotating speed
air conditioner
temperature
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CN201911212084.4A
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CN110848888A (en
Inventor
苏仁杰
卢景斌
李杏党
黄志刚
郭用松
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/43—Defrosting; Preventing freezing of indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0033—Indoor units, e.g. fan coil units characterised by fans having two or more fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a control method of an air conditioner, wherein an outdoor unit of the air conditioner comprises an outdoor heat exchanger, a first fan and a second fan, an air outlet surface of the first fan is arranged opposite to the upper part of the indoor heat exchanger, an air outlet surface of the second fan is arranged opposite to the lower part of the outdoor heat exchanger, and the control method of the air conditioner comprises the following steps: after the air conditioner enters a refrigeration mode and the outdoor temperature is lower than a first preset temperature, acquiring the outlet temperature of an outdoor heat exchanger, wherein after the air conditioner enters the refrigeration mode, the first fan and the second fan are in an operating state; and when the outlet temperature is lower than a second preset temperature, reducing the rotating speed of a target fan, wherein the target fan comprises at least one of the first fan and the second fan. The invention also discloses an air conditioner and a computer readable storage medium. The frequency of starting and stopping the compressor is low.

Description

Air conditioner, control method thereof and computer storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner, a control method thereof and a computer storage medium.
Background
With the improvement of living standard of people, the air conditioner becomes a standard distributor in a household.
When the air conditioner refrigerates under the lower circumstances of outdoor temperature, because outdoor temperature is lower for the condensation effect of outdoor heat exchanger is better, thereby makes the refrigeration effect of air conditioner better, and then makes indoor heat exchanger's easy frosting, at this moment, need control compressor shutdown and indoor heat exchanger frosting, avoid indoor heat exchanger frosting. Therefore, in the prior art, the problem that the compressor is frequently started and stopped due to low-temperature refrigeration of the air conditioner exists.
Disclosure of Invention
The invention mainly aims to provide an air conditioner, a control method thereof and a computer storage medium, and aims to solve the problem that the compressor is frequently started and stopped due to low-temperature refrigeration of the air conditioner.
In order to achieve the above object, the present invention provides a method for controlling an air conditioner, an outdoor unit of the air conditioner includes an outdoor heat exchanger, an air outlet surface of a first fan is disposed opposite to an upper portion of the indoor heat exchanger, an air outlet surface of a second fan is disposed opposite to a lower portion of the outdoor heat exchanger, the method for controlling the air conditioner includes the following steps:
after the air conditioner enters a refrigeration mode and the outdoor temperature is lower than a first preset temperature, acquiring the outlet temperature of an outdoor heat exchanger, wherein after the air conditioner enters the refrigeration mode, the first fan and the second fan are in an operating state;
and when the outlet temperature is lower than a second preset temperature, reducing the rotating speed of a target fan, wherein the target fan comprises at least one of the first fan and the second fan.
In one embodiment, the step of reducing the rotation speed of the target fan includes:
acquiring the middle temperature of the indoor heat exchanger;
and when the duration time that the middle temperature is lower than the third preset temperature reaches a first preset duration time, taking the first fan and the second fan as target fans, and controlling the target fans to operate according to the minimum rotating speed.
In an embodiment, after the step of obtaining the temperature of the middle portion of the indoor heat exchanger, the method further includes:
when the time length that the middle temperature is greater than or equal to a third preset temperature and less than a fourth preset temperature reaches a second preset time length, determining a first target rotating speed according to the current middle temperature of the indoor heat exchanger, the third preset temperature and the fourth preset temperature;
and controlling the first fan to operate according to the first target rotating speed, and controlling the second fan to operate according to the minimum rotating speed corresponding to the fan, wherein the first target rotating speed is greater than the rotating speed of the first fan before adjustment.
In an embodiment, after the step of controlling the target fan to operate at the minimum rotation speed, the method further includes:
when the detected outlet temperature of the outdoor heat exchanger is greater than or equal to a second preset temperature and less than a fifth preset temperature, and the duration that the middle temperature of the indoor heat exchanger is greater than or equal to a third preset temperature and less than a fourth preset temperature reaches a second preset duration, determining a first target rotating speed according to the current middle temperature, the third preset temperature and the fourth preset temperature of the indoor heat exchanger;
and controlling the first fan to operate according to the first target rotating speed, wherein the first target rotating speed is greater than the minimum rotating speed of the first fan.
In an embodiment, after the step of controlling the target fan to operate at the minimum rotation speed, the method further includes:
when the outlet temperature of the outdoor heat exchanger is detected to be higher than a fifth preset temperature, determining a second target rotating speed according to the current middle temperature of the outdoor heat exchanger and a fourth preset temperature;
and controlling the first fan to operate at the maximum rotating speed, and controlling the second fan to operate at the second target rotating speed, wherein the second target rotating speed is greater than the minimum rotating speed of the second fan.
In an embodiment, the step of obtaining the temperature of the outdoor heat exchanger is performed every third preset time period.
In one embodiment, the step of reducing the rotation speed of the target fan includes:
determining whether the current rotating speed of the first fan is the minimum rotating speed or not, wherein the target fan with the last reduced rotating speed is the first fan;
and when the current rotating speed of the first wind is the minimum rotating speed, taking the second fan as a target fan, and reducing the rotating speed of the target fan.
In one embodiment, the step of reducing the rotation speed of the target fan includes:
determining a rotation speed adjustment value according to a difference value between the outlet temperature of the outdoor heat exchanger and a second preset temperature;
and reducing the rotating speed of the target fan according to the rotating speed adjusting value.
In order to achieve the above object, the present invention further provides an air conditioner, wherein an outdoor unit of the air conditioner includes an outdoor heat exchanger, a first fan, a second fan, a memory, a processor, and a control program of the air conditioner stored in the memory and operable on the processor, an air outlet surface of the first fan is disposed opposite to an upper portion of the indoor heat exchanger, an air outlet surface of the second fan is disposed opposite to a lower portion of the outdoor heat exchanger, the first fan and the second fan are connected to the processor, and the control program of the air conditioner, when executed by the processor, implements the steps of the control method of the air conditioner.
To achieve the above object, the present invention also provides a computer-readable storage medium storing a control program of an air conditioner, which when executed by a processor, implements the steps of the control method of the air conditioner as described above.
The air conditioner comprises an outdoor heat exchanger, a first fan and a second fan, wherein the first fan and the second fan are arranged relative to the outdoor heat exchanger, the first fan and the second fan are started after the air conditioner operates in a refrigeration mode, and the rotating speed of at least one fan of the first fan and the second fan is reduced when the outdoor temperature is lower than a first preset temperature and the outlet temperature of the outdoor heat exchanger is lower than a second preset temperature. Because the outdoor temperature is less than the first preset temperature and the outlet temperature of the outdoor heat exchanger is less than the second preset temperature, the frosting tendency of the indoor heat exchanger of the air conditioner can be determined, at the moment, the rotating speed of at least one fan in the first fan and the second fan is reduced, so that the refrigerating capacity output by the air conditioner is reduced, the temperature reduction rate of the indoor heat exchanger is also reduced or the temperature of the indoor heat exchanger is increased, the frosting of the indoor heat exchanger is avoided, and the starting and stopping frequency of the compressor is low.
Drawings
FIG. 1 is a schematic diagram of a hardware architecture of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a control method of an air conditioner according to a first embodiment of the present invention;
fig. 3 is a detailed flowchart of step S20 in the second embodiment of the control method of the air conditioner according to the present invention;
fig. 4 is a detailed flowchart of step S20 in the third embodiment of the control method of the air conditioner according to the present invention;
FIG. 5 is a flow chart illustrating a fourth embodiment of a method for controlling an air conditioner according to the present invention;
FIG. 6 is a flow chart illustrating a fifth embodiment of a method for controlling an air conditioner according to the present invention;
fig. 7 is a detailed flowchart of step S20 in the sixth embodiment of the method for controlling an air conditioner according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: after the air conditioner enters a refrigeration mode and the outdoor temperature is lower than a first preset temperature, acquiring the outlet temperature of an outdoor heat exchanger, wherein after the air conditioner enters the refrigeration mode, the first fan and the second fan are in an operating state; and when the outlet temperature is lower than a second preset temperature, reducing the rotating speed of a target fan, wherein the target fan comprises at least one of the first fan and the second fan.
Because the outdoor temperature is less than the first preset temperature and the outlet temperature of the outdoor heat exchanger is less than the second preset temperature, the frosting tendency of the indoor heat exchanger of the air conditioner can be determined, at the moment, the rotating speed of at least one fan in the first fan and the second fan is reduced, so that the refrigerating capacity output by the air conditioner is reduced, the temperature reduction rate of the indoor heat exchanger is also reduced or the temperature of the indoor heat exchanger is increased, the frosting of the indoor heat exchanger is avoided, and the starting and stopping frequency of the compressor is low.
As one implementation, the air conditioner may be as shown in fig. 1.
The embodiment of the invention relates to an air conditioner, which comprises: a processor 101, e.g. a CPU, a memory 102, a communication bus 103. Wherein a communication bus 103 is used for enabling the connection communication between these components.
The memory 102 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). As shown in fig. 1, a control program of an air conditioner may be included in the memory 103 as a kind of computer storage medium; and the processor 101 may be configured to call a control program of the air conditioner stored in the memory 102 and perform the following operations:
after the air conditioner enters a refrigeration mode and the outdoor temperature is lower than a first preset temperature, acquiring the outlet temperature of an outdoor heat exchanger, wherein after the air conditioner enters the refrigeration mode, the first fan and the second fan are in an operating state;
and when the outlet temperature is lower than a second preset temperature, reducing the rotating speed of a target fan, wherein the target fan comprises at least one of the first fan and the second fan.
In one embodiment, the processor 101 may be configured to call a control program of an air conditioner stored in the memory 102 and perform the following operations:
acquiring the middle temperature of the indoor heat exchanger;
and when the duration time that the middle temperature is lower than the third preset temperature reaches a first preset duration time, taking the first fan and the second fan as target fans, and controlling the target fans to operate according to the minimum rotating speed.
In one embodiment, the processor 101 may be configured to call a control program of an air conditioner stored in the memory 102 and perform the following operations:
when the time length that the middle temperature is greater than or equal to a third preset temperature and less than a fourth preset temperature reaches a second preset time length, determining a first target rotating speed according to the current middle temperature of the indoor heat exchanger, the third preset temperature and the fourth preset temperature;
and controlling the first fan to operate according to the first target rotating speed, and controlling the second fan to operate according to the minimum rotating speed corresponding to the fan, wherein the first target rotating speed is greater than the rotating speed of the first fan before adjustment.
In one embodiment, the processor 101 may be configured to call a control program of an air conditioner stored in the memory 102 and perform the following operations:
when the detected outlet temperature of the outdoor heat exchanger is greater than or equal to a second preset temperature and less than a fifth preset temperature, and the duration that the middle temperature of the indoor heat exchanger is greater than or equal to a third preset temperature and less than a fourth preset temperature reaches a second preset duration, determining a first target rotating speed according to the current middle temperature, the third preset temperature and the fourth preset temperature of the indoor heat exchanger;
and controlling the first fan to operate according to the first target rotating speed, wherein the first target rotating speed is greater than the minimum rotating speed of the first fan.
In one embodiment, the processor 101 may be configured to call a control program of an air conditioner stored in the memory 102 and perform the following operations:
when the outlet temperature of the outdoor heat exchanger is detected to be higher than a fifth preset temperature, determining a second target rotating speed according to the current middle temperature of the outdoor heat exchanger and a fourth preset temperature;
and controlling the first fan to operate at the maximum rotating speed, and controlling the second fan to operate at the second target rotating speed, wherein the second target rotating speed is greater than the minimum rotating speed of the second fan.
In one embodiment, the processor 101 may be configured to call a control program of an air conditioner stored in the memory 102 and perform the following operations:
and executing the step of acquiring the temperature of the outdoor heat exchanger every third preset time interval.
In one embodiment, the processor 101 may be configured to call a control program of an air conditioner stored in the memory 102 and perform the following operations:
determining whether the current rotating speed of the first fan is the minimum rotating speed or not, wherein the target fan with the last reduced rotating speed is the first fan;
and when the current rotating speed of the first wind is the minimum rotating speed, taking the second fan as a target fan, and reducing the rotating speed of the target fan.
In one embodiment, the processor 101 may be configured to call a control program of an air conditioner stored in the memory 102 and perform the following operations:
determining a rotation speed adjustment value according to a difference value between the outlet temperature of the outdoor heat exchanger and a second preset temperature;
and reducing the rotating speed of the target fan according to the rotating speed adjusting value.
According to the scheme, the air conditioner comprises the outdoor heat exchanger, the first fan and the second fan are arranged relative to the outdoor heat exchanger, the air conditioner starts the first fan and the second fan after the air conditioner operates in the refrigeration mode, and when the outdoor temperature is lower than the first preset temperature and the outlet temperature of the outdoor heat exchanger is lower than the second preset temperature, the rotating speed of at least one fan in the first fan and the second fan is reduced. Because the outdoor temperature is less than the first preset temperature and the outlet temperature of the outdoor heat exchanger is less than the second preset temperature, the frosting tendency of the indoor heat exchanger of the air conditioner can be determined, at the moment, the rotating speed of at least one fan in the first fan and the second fan is reduced, so that the refrigerating capacity output by the air conditioner is reduced, the temperature reduction rate of the indoor heat exchanger is also reduced or the temperature of the indoor heat exchanger is increased, the frosting of the indoor heat exchanger is avoided, and the starting and stopping frequency of the compressor is low.
Based on the hardware architecture of the air conditioner, the embodiment of the control method of the air conditioner is provided.
Referring to fig. 2, fig. 2 is a first embodiment of a control method of an air conditioner according to the present invention, the control method of the air conditioner including the steps of:
step S10, acquiring the outlet temperature of the outdoor heat exchanger when the air conditioner enters a refrigeration mode and the outdoor temperature is lower than a first preset temperature, wherein the first fan and the second fan are in a running state after the air conditioner enters the refrigeration mode;
in this embodiment, the outdoor unit of the air conditioner includes an outdoor heat exchanger, a first fan and a second fan, and an air outlet surface of the first fan is arranged opposite to an upper portion of the outdoor heat exchanger, so that the first fan blows air to the outdoor heat exchanger; the air outlet surface of the second fan is arranged opposite to the lower part of the outdoor heat exchanger, so that the second fan blows air to the lower part of the outdoor heat exchanger. Certainly, the outdoor unit may include a fan, the fan includes a first wind wheel and a second wind wheel, the first wind wheel is disposed opposite to the upper portion of the outdoor heat exchanger, the second wind wheel is disposed opposite to the lower portion of the outdoor heat exchanger, and the first wind wheel and the second wind wheel are connected to different motors, that is, the air conditioner may control the first wind wheel and the second wind wheel to rotate respectively. The outdoor unit is provided with a temperature sensor for detecting the outdoor temperature, and the outlet of the outdoor heat exchanger is also provided with a temperature sensor for detecting the outlet temperature of the outdoor heat exchanger.
When the air conditioner operates in a refrigeration mode, the first fan and the second fan are controlled to operate. When the detected outdoor temperature is lower than the first preset temperature, the air conditioner can be judged to be low-temperature refrigeration. The first predetermined temperature may be any suitable value, for example, the first predetermined temperature may be 21 ℃. When the air conditioner refrigerates at low temperature, the operation of first fan and second fan can make outdoor heat exchanger's condensation effect better to can lead to indoor heat exchanger to frost easily. At this time, the air conditioner acquires the outlet temperature of the outdoor heat exchanger, and judges whether the outlet temperature is less than a second preset temperature.
And step S20, when the outlet temperature is lower than a second preset temperature, reducing the rotating speed of a target fan, wherein the target fan comprises at least one of the first fan and the second fan.
When the outlet temperature of the outdoor heat exchanger is lower than the second preset temperature, the temperature of the indoor heat exchanger can be judged to be lower and has a frosting trend, and at the moment, the cold output by the air conditioner needs to be reduced, namely, the falling speed of the temperature of the indoor heat exchanger is slowed down, and even the temperature of the indoor heat exchanger is increased.
In this regard, the air conditioner determines a target fan, which may be a first fan, a second fan, or both. The air conditioner controls the target fan to reduce the rotating speed, so that the condensation effect of the target fan on the outdoor heat exchanger is reduced, the cold output of the air conditioner is indirectly reduced, the temperature drop speed of the indoor heat exchanger is reduced, or the temperature of the indoor heat exchanger is increased, and the phenomenon that the compressor is stopped due to frosting of the indoor heat exchanger is avoided.
In the technical scheme that this embodiment provided, the air conditioner includes outdoor heat exchanger, first fan and second fan, and first fan sets up with the relative outdoor heat exchanger of second fan, and the air conditioner starts first fan and second fan after the operation refrigeration mode to when outdoor temperature is less than first preset temperature and the exit temperature of outdoor heat exchanger is less than the second preset temperature, with the rotational speed reduction of at least one fan in first fan and the second fan. Because the outdoor temperature is less than the first preset temperature and the outlet temperature of the outdoor heat exchanger is less than the second preset temperature, the frosting tendency of the indoor heat exchanger of the air conditioner can be determined, at the moment, the rotating speed of at least one fan in the first fan and the second fan is reduced, so that the refrigerating capacity output by the air conditioner is reduced, the temperature reduction rate of the indoor heat exchanger is also reduced or the temperature of the indoor heat exchanger is increased, the frosting of the indoor heat exchanger is avoided, and the starting and stopping frequency of the compressor is low.
Referring to fig. 3, fig. 3 is a second embodiment of the control method of the air conditioner according to the present invention, and based on the first embodiment, the step S20 includes:
step S21, acquiring the middle temperature of the indoor heat exchanger;
and step S22, when the duration of the middle temperature being less than a third preset temperature reaches a first preset duration, taking the first fan and the second fan as target fans, and controlling the target fans to operate at a minimum rotating speed.
In this embodiment, when the outlet temperature of the outdoor heat exchanger is low, the temperature of the indoor heat exchanger may be slightly high, that is, whether the indoor heat exchanger frosts cannot be accurately determined by determining the temperature of the outdoor heat exchanger. Therefore, the indoor heat exchanger is provided with the temperature sensor to collect the middle temperature of the indoor heat exchanger, and whether the indoor heat exchanger frosts or not is further accurately judged according to the middle temperature.
Specifically, when the middle temperature is lower than the third preset temperature, frosting of the indoor heat exchanger can be preliminarily determined. However, the temperature of the middle portion of the indoor heat exchanger may possibly rise, and therefore, when the time period during which the middle temperature is less than the third preset temperature reaches the first preset time period, in order to slow down the frosting state of the indoor heat exchanger, the first fan and the second fan are used as the target fans, so that the target fans are controlled to operate at the minimum rotation speed, and the first preset time period may be any suitable value, for example, the first preset time period may be 1 min. Namely, the first fan and the second fan are controlled to operate according to the respective minimum rotating speeds. The minimum rotating speed can be zero or a certain smaller rotating speed value, and the minimum rotating speed is zero, namely the first fan and the second fan are controlled to stop running. It should be noted that, if the middle temperature is lower than the third preset temperature, and the difference between the third preset temperature and the middle temperature is greater than the preset difference, it indicates that the temperature of the indoor heat exchanger is very low, at this time, the first fan and the second fan can be locked, so that the wind wheels of the first fan and the second fan cannot rotate along with the flow of the air, that is, the first fan and the second fan block a part of the air flowing to the outdoor heat exchanger, and the condensation effect of the air on the outdoor heat exchanger is further reduced.
In the technical scheme that this embodiment provided, the exit temperature at outdoor heat exchanger is less than the second and predetermines the temperature, and the middle part temperature of indoor heat exchanger is less than the third and predetermines the temperature, can judge that indoor heat exchanger frosts or has the trend of frosting, and at this moment, control first fan and second fan are according to minimum rotational speed operation to slow down indoor heat exchanger frosting trend and in order to avoid the compressor to shut down.
Referring to fig. 4, fig. 4 is a third embodiment of the control method of the air conditioner according to the present invention, and based on the second embodiment, after step S21, the method further includes:
step S23, when the time length that the middle temperature is greater than or equal to a third preset temperature and less than a fourth preset temperature reaches a second preset time length, determining a first target rotating speed according to the current middle temperature of the indoor heat exchanger, the third preset temperature and the fourth preset temperature;
and step S24, controlling the first fan to operate according to the first target rotating speed, and controlling the second fan to operate according to the minimum rotating speed corresponding to the fan, wherein the first target rotating speed is greater than the rotating speed of the first fan before adjustment.
In this embodiment, after determining that the middle temperature of the indoor heat exchanger is greater than or equal to the third preset temperature, the air conditioner further determines whether the middle temperature is less than a fourth preset temperature, where the fourth preset temperature is greater than the third preset temperature. If the middle temperature is lower than the fourth preset temperature, the frosting tendency of the indoor heat exchanger can be preliminarily judged, but the middle temperature may rise, so that the middle temperature is higher than the fourth preset temperature, therefore, the duration that the middle temperature is higher than or equal to the third preset temperature and lower than the fourth preset temperature is obtained, if the duration reaches the second preset duration, the frosting tendency of the indoor heat exchanger can be judged, the second preset duration can be any appropriate numerical value, and for example, the second preset duration can be 2 min. The indoor heat exchanger has a frosting tendency, but the refrigeration effect of the air conditioner still needs to be ensured, so that the rotating speed of the target fan can be slightly reduced, and the refrigeration effect of the air conditioner is ensured while the frosting tendency is relieved.
The upper part of the outdoor heat exchanger is a gaseous refrigerant, and the lower part of the outdoor heat exchanger is a liquid refrigerant. The heat exchange efficiency of the gaseous refrigerant is higher than that of the liquid refrigerant, so that compared with the reduction of the rotating speed of the second fan, the reduction of the rotating speed of the first fan can greatly reduce the refrigerating output of the air conditioner. Therefore, the indoor heat exchanger has a frosting tendency, the second fan is controlled to operate at the minimum rotating speed, and the first fan is controlled to operate at the first target rotating speed, so that the temperature of the indoor heat exchanger cannot be greatly increased, and the output refrigerating capacity of the air conditioner is ensured. The first target rotating speed is determined according to the current middle temperature, the third preset temperature and the fourth preset temperature of the indoor heat exchanger. Specifically, R1 is (Rmax-Rmin) (T2-T21)/(T22-T21), Rmax is the maximum rotation speed of the first fan, Rmin is the minimum rotation speed of the first fan, T2 is the middle temperature, T21 is the third preset temperature, and T22 is the fourth preset temperature.
In the technical scheme provided by this embodiment, when the outlet temperature of the outdoor heat exchanger is less than the second preset temperature, and the middle temperature of the indoor heat exchanger is greater than or equal to the third preset temperature and less than the fourth preset temperature, and the duration reaches the second preset duration, the tendency of frosting of the indoor heat exchanger can be determined, at this moment, the second fan is controlled to operate at the minimum rotating speed, the first fan is controlled to operate at the target rotating speed, and the refrigeration effect of the air conditioner is ensured while frosting of the indoor heat exchanger is slowed down.
Referring to fig. 5, fig. 5 shows a fourth embodiment of the control method of the air conditioner, and based on the second or third embodiment, after step S22, the method further includes:
step S30, when detecting that the outlet temperature of the outdoor heat exchanger is greater than or equal to a second preset temperature and less than a fifth preset temperature, and the duration of the middle temperature of the indoor heat exchanger which is greater than or equal to a third preset temperature and less than a fourth preset temperature reaches a second preset duration, determining a first target rotating speed according to the current middle temperature of the indoor heat exchanger, the third preset temperature and the fourth preset temperature;
and step S40, controlling the first fan to operate according to the first target rotating speed, wherein the first target rotating speed is greater than the minimum rotating speed of the first fan.
In this embodiment, the first fan and the second fan both operate at the minimum rotation speed, which may gradually increase the temperature of the indoor heat exchanger. Therefore, after the first fan and the second fan operate according to respective minimum rotating speeds, the air conditioner continues to acquire the outlet temperature of the outdoor heat exchanger, if the outlet temperature is greater than or equal to a second preset temperature and less than a fifth preset temperature, frosting of the air conditioner can be preliminarily judged, the air conditioner further acquires the middle temperature of the indoor heat exchanger, and if the middle temperature is greater than or equal to a third preset temperature and less than a fourth preset temperature, frosting of the air conditioner can be judged to be slowed down; at this moment, if the middle temperature is greater than or equal to the third preset temperature and less than the fourth preset temperature, the time reaches the second preset time, the frosting of the air conditioner can be accurately judged, if the first fan and the second fan are continuously controlled to operate at the minimum rotating speed, the temperature of the indoor heat exchanger can be continuously increased, namely, the cold quantity output by the air conditioner can be continuously reduced, therefore, the first fan needs to be controlled to operate at the first target rotating speed, the second fan still operates at the minimum rotating speed, and the first target rotating speed is greater than the minimum rotating speed of the first fan. The first target rotation speed is determined by referring to the above description, and will not be described in detail herein.
In the technical scheme that this embodiment provided, after first fan and second fan operated according to minimum rotational speed, if the frosting condition that detects indoor heat exchanger slows down to certain degree, then the rotational speed of increase first fan to the cold volume of increasing the air conditioner output under the condition of slowing down indoor heat exchanger frosting.
Referring to fig. 6, fig. 6 shows a fifth embodiment of the method for controlling an air conditioner according to the present invention, and based on the second or third embodiment, after step S22, the method further includes:
step S50, when detecting that the outlet temperature of the outdoor heat exchanger is higher than a fifth preset temperature, determining a second target rotating speed according to the current middle temperature of the outdoor heat exchanger and a fourth preset temperature;
and step S60, controlling the first fan to operate at the maximum rotating speed, and controlling the second fan to operate at the second target rotating speed, wherein the second target rotating speed is greater than the minimum rotating speed of the second fan.
In this embodiment, the first fan and the second fan both operate at the minimum rotation speed, which may gradually increase the temperature of the indoor heat exchanger. When the outlet temperature of the outdoor heat exchanger is higher than the fifth preset temperature, the indoor temperature can be judged to be higher, namely, the output cold quantity of the air conditioner is less, and the refrigerating capacity of the air conditioner needs to be improved. The fifth preset temperature is greater than the second preset temperature.
And then, adjusting the rotating speed of the first fan from the minimum rotating speed to the maximum rotating speed, and increasing the rotating speed of the second fan from the minimum rotating speed to a second target rotating speed, wherein the second target rotating speed is determined according to the current middle temperature of the outdoor heat exchanger and a fourth preset temperature. Specifically, R2 is (Rmax-Rmin) (T2-T22)/T22, where Rmax is the maximum rotation speed of the second fan, Rmin is the minimum rotation speed of the second fan, T2 is the middle temperature, and T22 is the fourth preset temperature. The second fan is at the maximum rotating speed, so that the gaseous refrigerant on the upper part of the outdoor heat exchanger can be condensed into the liquid refrigerant at a higher speed, and the cold output by the air conditioner can be greatly improved.
In the technical scheme provided by this embodiment, after the air conditioner reduces the rotation speeds of the first fan and the second fan, if the outlet temperature of the indoor heat exchanger is detected to be greater than the fifth preset temperature, the rotation speed of the first fan is adjusted to the maximum, and the second fan is controlled to increase the rotation speed to the second target rotation speed so as to increase the cooling capacity output by the air conditioner.
In an embodiment, when the outdoor temperature is lower than the first preset temperature and the outlet temperature of the outdoor heat exchanger is lower than the second preset temperature, the step of obtaining the temperature of the outdoor heat exchanger is performed every third preset time period, that is, the rotation speed of the target fan is gradually reduced. It should be noted that after the rotating speed of the target fan is reduced each time, a third preset time interval is performed, whether the outlet temperature of the outdoor heat exchanger is less than the second preset temperature is judged, and if the outlet temperature of the outdoor heat exchanger is less than the second preset temperature, the rotating speed of the target fan is continuously reduced.
Furthermore, compared with the reduction of the rotating speed of the second fan, the reduction of the rotating speed of the first fan can enable the output cold quantity of the air conditioner to be smaller in a larger range, so that the frosting of the indoor heat exchanger needs to be delayed, the rotating speed of the first fan is preferentially reduced, and the rotating speed of the second fan is reduced after the rotating speed of the first fan is reduced to the minimum rotating speed. Therefore, when the target fan is the first fan and the target fan needs to be adjusted in rotation speed, whether the current rotation speed of the first fan is the minimum rotation speed or not needs to be judged, and if the current rotation speed of the first fan is the minimum rotation speed, the second fan is determined to be the target fan, so that the rotation speed of the second fan is reduced. And if the current rotating speed of the first fan is not the minimum rotating speed, continuing to take the first fan as a target fan, and continuing to reduce the rotating speed of the first fan.
In the technical scheme provided by this embodiment, when the outlet temperature of the outdoor heat exchanger is less than the second preset temperature, the reduction of the rotating speed of the target fan is performed every third preset time, so that the poor refrigerating effect of the air conditioner caused by the excessively large single reduction amplitude of the cold output by the air conditioner is avoided.
Referring to fig. 7, fig. 7 is a sixth embodiment of the control method of the air conditioner according to the present invention, and based on the first embodiment, the step S20 further includes:
step S25, determining a rotation speed adjusting value according to the difference value between the outlet temperature of the outdoor heat exchanger and a second preset temperature;
and step S26, reducing the rotating speed of the target fan according to the rotating speed adjusting value.
In this embodiment, when the outlet temperature of the outdoor heat exchanger is lower than the second preset temperature, the difference between the outlet temperature and the second preset temperature represents the frosting degree of the indoor heat exchanger. If the absolute value of the difference is larger, the frosting condition of the indoor heat exchanger is more serious, and if the absolute value of the difference is smaller, the frosting condition of the indoor heat exchanger is more slight. When the frosting condition is serious, the rotating speed of the target fan needs to be greatly reduced; when the frosting condition is slight, the rotating speed of the target fan can be slightly reduced. In this regard, a mapping relationship between a difference between the outlet temperature and the second preset temperature and the rotation speed adjustment value may be established, and the larger the absolute value of the difference is, the larger the rotation speed adjustment value is, that is, the larger the rotation speed at which the rotation speed of the target fan is reduced is.
In the technical scheme that this implementation provided, the rotational speed of target fan is adjusted according to the difference between export temperature and the second preset temperature to the air conditioner for the rotational speed of reasonable reduction fan of air conditioner.
The invention further provides an air conditioner, wherein the outdoor unit of the air conditioner comprises an outdoor heat exchanger, a first fan, a second fan, a memory, a processor and a control program of the air conditioner, the control program is stored in the memory and can run on the processor, the air outlet surface of the first fan is arranged opposite to the upper part of the indoor heat exchanger, the air outlet surface of the second fan is arranged opposite to the lower part of the outdoor heat exchanger, the first fan and the second fan are connected with the processor, and when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner in the embodiment are realized.
The present invention also provides a computer-readable storage medium storing a control program of an air conditioner, which when executed by a processor, implements the steps of the control method of the air conditioner as described in the above embodiments.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (8)

1. The control method of the air conditioner is characterized in that an outdoor unit of the air conditioner comprises an outdoor heat exchanger, a first fan and a second fan, wherein an air outlet surface of the first fan is arranged opposite to the upper part of the outdoor heat exchanger, so that the first fan blows air to the outdoor heat exchanger; the air outlet surface of the second fan is arranged opposite to the lower part of the outdoor heat exchanger, so that the second fan blows air to the lower part of the outdoor heat exchanger, the upper part of the outdoor heat exchanger is a gaseous refrigerant, the lower part of the outdoor heat exchanger is a liquid refrigerant, and the control method of the air conditioner comprises the following steps:
after the air conditioner enters a refrigeration mode and the outdoor temperature is lower than a first preset temperature, acquiring the outlet temperature of an outdoor heat exchanger, wherein after the air conditioner enters the refrigeration mode, the first fan and the second fan are in an operating state;
when the outlet temperature is lower than a second preset temperature, reducing the rotating speed of a target fan, wherein the target fan comprises at least one of the first fan and the second fan;
the step of reducing the rotation speed of the target fan comprises the following steps:
acquiring the middle temperature of the indoor heat exchanger;
when the time length that the middle temperature is greater than or equal to a third preset temperature and less than a fourth preset temperature reaches a second preset time length, determining a first target rotating speed according to the current middle temperature of the indoor heat exchanger, the third preset temperature and the fourth preset temperature;
controlling the first fan to operate according to the first target rotating speed, and controlling the second fan to operate according to the minimum rotating speed corresponding to the fan, wherein the first target rotating speed is greater than the rotating speed of the first fan before adjustment;
and when the duration time that the middle temperature is lower than the third preset temperature reaches a first preset duration time, taking the first fan and the second fan as target fans, and controlling the target fans to operate according to the minimum rotating speed.
2. The method of controlling an air conditioner according to claim 1, further comprising, after the step of controlling the target fan to operate at the minimum rotation speed:
when the detected outlet temperature of the outdoor heat exchanger is greater than or equal to a second preset temperature and less than a fifth preset temperature, and the duration that the middle temperature of the indoor heat exchanger is greater than or equal to a third preset temperature and less than a fourth preset temperature reaches a second preset duration, determining a first target rotating speed according to the current middle temperature, the third preset temperature and the fourth preset temperature of the indoor heat exchanger;
and controlling the first fan to operate according to the first target rotating speed, wherein the first target rotating speed is greater than the minimum rotating speed of the first fan.
3. The method of controlling an air conditioner according to claim 1, further comprising, after the step of controlling the target fan to operate at the minimum rotation speed:
when the outlet temperature of the outdoor heat exchanger is detected to be higher than a fifth preset temperature, determining a second target rotating speed according to the current middle temperature of the outdoor heat exchanger and a fourth preset temperature;
and controlling the first fan to operate at the maximum rotating speed, and controlling the second fan to operate at the second target rotating speed, wherein the second target rotating speed is greater than the minimum rotating speed of the second fan.
4. The control method of an air conditioner according to claim 1, wherein the step of obtaining the temperature of the outdoor heat exchanger is performed every third preset time period.
5. The control method of an air conditioner according to claim 4, wherein the step of reducing the rotation speed of the target fan comprises:
determining whether the current rotating speed of the first fan is the minimum rotating speed or not, wherein the target fan with the last reduced rotating speed is the first fan;
and when the current rotating speed of the first wind is the minimum rotating speed, taking the second fan as a target fan, and reducing the rotating speed of the target fan.
6. The control method of an air conditioner according to claim 1, wherein the step of reducing the rotation speed of the target fan comprises:
determining a rotation speed adjustment value according to a difference value between the outlet temperature of the outdoor heat exchanger and a second preset temperature;
and reducing the rotating speed of the target fan according to the rotating speed adjusting value.
7. An air conditioner characterized in that an outdoor unit of the air conditioner comprises an outdoor heat exchanger, a first fan, a second fan, a memory, a processor and a control program of the air conditioner stored in the memory and capable of running on the processor, wherein an air outlet surface of the first fan is arranged opposite to the upper part of the indoor heat exchanger, an air outlet surface of the second fan is arranged opposite to the lower part of the outdoor heat exchanger, the first fan and the second fan are connected with the processor, and the control program of the air conditioner realizes the steps of the control method of the air conditioner according to any one of claims 1 to 6 when being executed by the processor.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a control program of an air conditioner, which when executed by a processor, implements the steps of the control method of the air conditioner according to any one of claims 1 to 6.
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