CN111189158B - Air conditioner and anti-freezing control method thereof - Google Patents

Air conditioner and anti-freezing control method thereof Download PDF

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Publication number
CN111189158B
CN111189158B CN201811352010.6A CN201811352010A CN111189158B CN 111189158 B CN111189158 B CN 111189158B CN 201811352010 A CN201811352010 A CN 201811352010A CN 111189158 B CN111189158 B CN 111189158B
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temperature
air conditioner
freezing
current
air
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CN111189158A (en
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许文明
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home 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
    • 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
    • F24F11/62—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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • 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
    • F24F2140/50—Load

Abstract

The invention discloses an air conditioner and an anti-freezing control method thereof, and belongs to the technical field of air conditioners. The control method comprises the following steps: periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period; acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of an inner fan; and determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe corresponding to the previous period of the period in which the current working current is located. The air conditioner and the anti-freezing control method thereof can judge the freezing condition of the air conditioner according to the working current, the air inlet temperature and the air outlet temperature of an inner fan of the air conditioner, and can timely control the air conditioner to perform anti-freezing protection on an indoor heat exchanger when the freezing problem of the air conditioner can be judged; the control method for preventing the freezing can enable the air conditioner to trigger the freezing prevention protection of the air conditioner more timely and sensitively.

Description

Air conditioner and anti-freezing control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and an anti-freezing control method thereof.
Background
When the air conditioner is used for refrigerating or dehumidifying, the outer surface of the indoor heat exchanger is always in a lower temperature state due to the temperature angle of the refrigerant entering the indoor heat exchanger of the indoor unit, when indoor air flows through the indoor heat exchanger, water vapor in the air is easily condensed into dew or even frost on the indoor heat exchanger, so that the indoor heat exchanger of the indoor unit is frozen, the refrigerating effect of the air conditioner is influenced, and the refrigerating or dehumidifying capacity of the air conditioner is weaker and weaker.
For the freezing phenomenon of an indoor heat exchanger of an air conditioner, an anti-freezing implementation mode mainly adopted by the existing air conditioner is to detect the temperature of a coil by using a temperature sensor installed on the coil of the indoor heat exchanger, so that the air conditioner can judge whether the indoor heat exchanger is frozen or not according to the temperature of the coil of an indoor unit, and when the coil of the indoor unit is frozen, the air conditioner can timely treat the freezing phenomenon. However, the existing air conditioner is generally only provided with a single temperature sensor at the middle position of an indoor heat exchanger of an indoor unit of the air conditioner, and whether the freezing problem exists is judged only through the value of a single temperature parameter detected by the temperature sensor, and because the low-temperature refrigerant flows through a plurality of branch pipe flow paths of the indoor heat exchanger, when the branch pipe flow path position at a non-middle position freezes, the temperature sensor arranged at the middle position is not sensitive to the low-temperature sensing of the temperature sensor, which easily causes the whole freezing problem of the indoor heat exchanger of the air conditioner to be serious and then is easily sensed by the temperature sensor, so that the requirement of the air conditioner on timely and sensitive triggering of anti-freezing protection of the air conditioner cannot be met.
Disclosure of Invention
The invention provides an air conditioner and an anti-freezing method thereof, aiming at solving the defect that the traditional air conditioner is insensitive to anti-freezing protection triggering caused by adopting a single temperature sensor to sense the temperature of a coil. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the present invention, there is provided a control method for preventing freezing of an air conditioner, the control method comprising:
periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of an inner fan;
and determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe corresponding to the previous period of the period in which the current working current is located.
In an optional implementation manner, determining whether the air conditioner has a freezing problem according to the current working current, the working current mean value corresponding to the previous cycle of the cycle in which the current working current is located, the air inlet temperature, the air outlet temperature, and the temperature of the external coil, includes:
calculating a current difference value of a working current mean value corresponding to a previous period of a period in which the current working current is located;
if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, and the temperature of the outer coil is lower than a preset freezing temperature threshold value, the freezing problem of the air conditioner is determined;
otherwise, determining that the air conditioner has no freezing problem.
In an optional embodiment, the control method further comprises:
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
In an optional embodiment, the control method further comprises:
after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of an inner fan;
re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe, which correspond to the previous period of the period in which the working current is located;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
In an optional embodiment, before periodically detecting a plurality of operating currents of the internal fan for a set period duration, the control method further includes:
and controlling to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.
According to the second aspect of the present invention, there is also provided an air conditioner, the air conditioner comprising an air conditioner body and a controller, the controller being configured to:
periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of an inner fan;
and determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe corresponding to the previous period of the period in which the current working current is located.
In an alternative embodiment, the controller is specifically configured to:
calculating a current difference value of a working current mean value corresponding to a previous period of a period in which the current working current is located;
if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, and the temperature of the outer coil is lower than a preset freezing temperature threshold value, the freezing problem of the air conditioner is determined;
otherwise, determining that the air conditioner has no freezing problem.
In an alternative embodiment, the controller is further configured to:
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
In an alternative embodiment, the controller is further configured to:
after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of an inner fan;
re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe, which correspond to the previous period of the period in which the working current is located;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
In an optional embodiment, the controller is further configured to control to switch an air deflector of an indoor unit of the air conditioner to the maximum air outlet angle before periodically detecting a plurality of operating currents of the inner fan in the set period duration.
The invention adopts the technical scheme and has the beneficial effects that:
the air conditioner and the anti-freezing control method thereof can judge the freezing condition of the air conditioner according to the working current, the air inlet temperature and the air outlet temperature of an inner fan of the air conditioner, and can timely control the air conditioner to perform anti-freezing protection on an indoor heat exchanger when the freezing problem of the air conditioner can be judged; the control method for preventing the air conditioner from freezing can enable the air conditioner to trigger self anti-freezing protection more timely and sensitively, and ensures the safe and stable operation of the air conditioner.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic flow chart diagram illustrating a method for controlling freeze prevention of an air conditioner according to an exemplary embodiment of the present invention;
FIG. 2 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to the present invention, in accordance with still another exemplary embodiment;
FIG. 3 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to the present invention, in accordance with still another exemplary embodiment;
FIG. 4 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to the present invention, in accordance with still another exemplary embodiment;
FIG. 5 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to the present invention, in accordance with still another exemplary embodiment;
FIG. 6 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to the present invention, in accordance with still another exemplary embodiment;
fig. 7 is a flowchart illustrating a control method for preventing freezing of an air conditioner according to another exemplary embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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, 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 or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
Fig. 1 is a control method for preventing freezing of an air conditioner according to the present invention, according to an exemplary embodiment.
As shown in fig. 1, the invention provides a control method for preventing freezing of an air conditioner, which can be used for solving the problem that the air outlet and heat exchange efficiency are affected due to freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; the following mainly takes the anti-freezing protection in the cooling mode as an example, but it should be understood that other working modes of the air conditioner, which may cause the freezing problem of the indoor heat exchanger, may also apply the anti-freezing control method of the present invention; specifically, the method mainly comprises the following steps:
s101, periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in a corresponding period;
optionally, the period duration is set to be 30s, that is, every 30s is a detection period; acquiring at least two working currents in each set period, and calculating the mean value of all the working currents acquired in the set period to be used as the mean value of the working currents in the period;
here, the air conditioner is provided with a motor for driving the inner fan, and thus, the working motor obtained in step S101 is a current parameter for the air conditioner driving motor to operate;
s102, acquiring the current working current, the air inlet temperature and the air outlet temperature of the inner fan;
here, the current working current, the air inlet temperature and the air outlet temperature are detected real-time working current, air inlet temperature and air outlet temperature in a detection period of the current control flow;
as an optional embodiment, a temperature sensor is respectively arranged at an air inlet and an air outlet of an indoor unit of the air conditioner, and the temperature sensors can be respectively used for detecting the real-time inlet air temperature of the air inlet and the real-time outlet air temperature of the air outlet of the indoor unit; step S102, the temperature data detected by the two sensors are used as the inlet air temperature and the outlet air temperature;
s103, determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature and the air outlet temperature corresponding to the previous period of the period where the current working current is located.
Here, if the period of the current working current is the current working current obtained in the nth period; the working current mean value corresponding to the previous period is the working current mean value of the (N-1) th period; thus, the control flow of the anti-freezing of the air conditioner at least starts to be executed after the 2 nd detection period, and the control flow is not executed in the 1 st detection period;
optionally, in step S103, it is determined whether the air conditioner has a freezing problem according to the current working current, the working current mean value, the air inlet temperature, and the air outlet temperature corresponding to the previous cycle of the cycle in which the current working current is located, where the current working current is located, and the determining includes: calculating a current difference value of a working current mean value corresponding to a previous period of a period in which the current working current is located; if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, and the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, determining that the air conditioner has a freezing problem; otherwise, determining that the air conditioner has no freezing problem.
For example, set the present operating current to InThe average value of the working current of the previous period is in-1If the current difference value of the working current mean value corresponding to the previous period of the current working current and the current working current is In-in-1The quotient of the current difference and the present operating current is (I)n-in-1)/In(ii) a Here, for the sake of calculation, the current difference value takes the absolute value of the difference thereof.
The preset quotient threshold and the preset temperature difference threshold are preset threshold parameters of the air conditioner and are used for representing whether the indoor unit of the air conditioner has a freezing problem or not; if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, and the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, the temperature of the inner coil pipe is indicated to be decreased faster at the moment, and then the fact that the freezing quantity of the indoor unit is more and the freezing speed of the indoor unit is faster can be judged, and at the moment, the air conditioner needs to perform anti-freezing treatment on the indoor unit; otherwise, the speed of the temperature drop of the inner coil is slower, so that the freezing quantity of the indoor unit is less and the freezing speed is slower, and at the moment, the air conditioner does not need to perform anti-freezing treatment on the indoor unit temporarily.
Optionally, the quotient threshold value is 0.1; the temperature difference threshold value is 10 ℃.
Therefore, in step S103, the current freezing condition of the indoor unit is controlled and further determined by comparing the quotient of the current difference value and the current working current with the preset quotient threshold value and comparing the temperature difference value with the preset temperature difference threshold value, so as to further determine whether the air conditioner needs to be switched to the anti-freezing mode.
The air conditioner and the anti-freezing control method thereof can judge the freezing condition of the air conditioner according to the working current, the air inlet temperature and the air outlet temperature of an inner fan of the air conditioner, and can timely control the air conditioner to perform anti-freezing protection on an indoor heat exchanger when the freezing problem of the air conditioner can be judged; the control method for preventing the air conditioner from freezing can enable the air conditioner to trigger self anti-freezing protection more timely and sensitively, and ensures the safe and stable operation of the air conditioner.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; when the air conditioner determines that the indoor heat exchanger of the air conditioner has the freezing problem, the freezing problem of the indoor unit of the air conditioner can be prevented from being further aggravated by switching the anti-freezing mode, the amount of frozen frost on the indoor heat exchanger can be reduced, and the stable and safe operation of the air conditioner can be guaranteed.
Optionally, the freeze prevention mode for switching the air conditioner includes: reducing the current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
Here, the frequency of the compressor is reduced, the amount of refrigerant in a refrigerant circulation pipeline conveyed to the air conditioner by the compressor can be reduced, and the exhaust temperature is reduced; therefore, the quantity of the refrigerant flowing into the indoor heat exchanger through the refrigerant circulating pipeline is reduced, the liquid inlet temperature is increased, and the temperature condition that the indoor heat exchanger of the air conditioner generates frost freezing can be effectively improved.
Optionally, the value of the preset frequency is 0.8; that is, after the air conditioner is switched to the anti-freezing mode, the frequency of the compressor is reduced to 80% of the original frequency.
Optionally, the anti-freezing mode for switching the air conditioner may further include controlling the air conditioner to switch to a heating mode for operation; when the air conditioner is switched to the heating mode to operate, high-temperature refrigerant discharged by a compressor of the air conditioner flows into the indoor heat exchanger first, the surface temperature of the indoor heat exchanger can be raised by utilizing the heat of the refrigerant, so that frost frozen on the outer surface of the outdoor heat exchanger is melted, and the aim of preventing the air conditioner from freezing is fulfilled.
Here, the air conditioner is operated for a set period of time when switched to the heating mode. Optionally, the specific duration of the set duration is determined according to the temperature of the inner coil of the indoor unit, and here, the air conditioner is further provided with a temperature sensor in the indoor heat exchanger of the indoor unit, and the temperature sensor can be used for detecting the temperature of the inner coil of the indoor heat exchanger. The specific duration of the set duration is in a negative correlation with the temperature of the coil, namely the lower the temperature of the coil is, the more serious the freezing problem of the air conditioner is, the longer the specific duration of the set duration is, so as to ensure that the air conditioner has enough time to defrost and melt ice for the indoor heat exchanger; and the higher the coil temperature is, the lighter the freezing problem of the air conditioner is, and the shorter the specific time length of the set time length is.
Or, the air conditioner can also adopt other anti-freezing modes in the prior art to perform anti-freezing protection on the indoor heat exchanger of the air conditioner.
In the present embodiment, the operation mode of the air conditioner includes a cooling mode, a heating mode, and the like. In a refrigeration mode, a low-temperature refrigerant flows into the indoor heat exchanger, and the indoor heat exchanger can be frozen under the conditions of low temperature of the refrigerant, overlarge flow rate of the refrigerant and the like; in the heating mode, a high-temperature refrigerant flows into the indoor heat exchanger, and the overall heat load of the air conditioner is high under the conditions of overhigh temperature and overlarge flow of the refrigerant, so that the safe operation of the air conditioner is influenced.
Here, in the conventional air conditioner, the determination of the freezing prevention and the determination of the thermal load protection are performed with high accuracy using the temperature of the refrigerant flowing into the indoor heat exchanger as a reference parameter. In the control flow of the invention, the invention can also utilize the temperature of the inner coil pipe detected by the temperature sensor arranged on the air conditioner to carry out load protection. Therefore, the process of the invention can not only judge the anti-freezing protection of the indoor heat exchanger according to the temperature of the coil; meanwhile, the heat load protection operation in the heating mode can be realized according to the temperature of the inner coil without being limited to the temperature parameter detected by the sensor which is arranged on the high-temperature refrigerant inflow pipe orifice of the indoor heat exchanger.
Specifically, for the problem of load protection in the heating mode, the control method of the present invention further includes: when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of an inner coil of an indoor heat exchanger; determining the cold-medium temperature according to the exhaust temperature of the compressor and the temperature of an inner coil of the indoor heat exchanger; and performing load protection operation on the air conditioner according to the cold and medium temperature.
Here, the related operation flow of the air conditioner load protection may be applied to a flow of starting a heating mode when the air conditioner is started in severe cold weather in winter, and may also be applied to the load protection operation when the heating mode is used for anti-freezing protection.
In this embodiment, the exhaust pipe orifice of the compressor of the air conditioner is further provided with another temperature sensor, and the temperature sensor can be used for detecting the obtained exhaust temperature of the compressor; meanwhile, the coil temperature is also detected by the temperature sensor arranged on the indoor heat exchanger of the indoor unit.
Optionally, determining the cold-medium temperature according to the discharge temperature of the compressor and the temperature of the inner coil of the indoor heat exchanger, includes: the cold medium temperature is calculated according to the following formula,
Tcoil＝A*Td+B*Tc+D，
wherein Tcoil is the cold medium temperature, Td is the discharge temperature of the compressor, Tc is the inner coil temperature of the indoor heat exchanger, a is a first calculated coefficient associated with the discharge temperature, B is a second calculated coefficient associated with the coil temperature, and D is a calculated constant.
Optionally, in the load protection operation of the air conditioner according to the cold-medium temperature, whether the air conditioner needs to perform the load protection operation or not can be judged according to the cold-medium temperature; when it is determined that the air conditioner needs to perform the load protection operation, the air conditioner performs a responsive load protection operation.
In this embodiment, determining whether the air conditioner needs to perform the load protection operation according to the cold-medium temperature may specifically include: and comparing the cold medium temperature with a preset temperature threshold value, and determining whether the air conditioner needs to perform load protection operation according to the comparison result. Specifically, when the temperature in the cold air is greater than or equal to a preset temperature threshold, determining that the air conditioner needs to perform load protection operation; and when the cold-medium temperature is smaller than the preset temperature threshold value, determining that the air conditioner does not need to carry out load protection operation.
Optionally, the load protection operation performed by the air conditioner may include: reducing the operating frequency of the compressor, increasing the rotating speed of an inner fan of the indoor unit, increasing the flow opening of the throttling device, and the like. Alternatively, the air conditioner may also employ other load protection operations in the prior art to protect the safe operation of the heating mode of the air conditioner.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature and the air outlet temperature of an inner fan; re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature and the air outlet temperature corresponding to the previous period of the period in which the working current is located; and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
After the air conditioner executes the anti-freezing operation and continues to set the duration, the freezing condition of the air conditioner is judged for the second time again by using the detection and judgment process, the air conditioner exits from the anti-freezing mode after meeting the preset condition, and the air conditioner is switched back to the working mode before the air conditioner executes the anti-freezing mode, such as the refrigeration mode; therefore, the influence of the air conditioner to execute the anti-freezing mode on the originally set refrigeration and cooling requirements of the user can be reduced, and the use experience of the user is improved.
Here, the specific obtaining manner of the relevant parameters and the specific determination manner of the air conditioner freezing problem may refer to the foregoing steps S102 to S103, which are not described herein again.
Optionally, before periodically detecting a plurality of working currents of the inner fan in the set period duration, the control method further includes: and controlling to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle. Here, when the air deflector of the air conditioner is at different air outlet angles, the air outlet volume of the air conditioner is also affected, and further certain interference influence is caused on the air outlet temperature of the air conditioner, the current of the inner fan and the like, so that in order to ensure the accuracy of judging the anti-freezing problem of the air conditioner, the air deflector of the air conditioner is switched to the maximum air outlet angle before the first working current of the inner fan, the first air inlet temperature of the indoor unit and the first air outlet temperature of the air conditioner are obtained when the air conditioner operates in the current working mode, and therefore the air conditioner can perform air outlet at the maximum air outlet volume, and the detection accuracy of relevant parameters is improved.
Fig. 2 is a control method for preventing freezing of an air conditioner according to the present invention, shown in accordance with still another exemplary embodiment.
As shown in fig. 2, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s201, periodically detecting a plurality of working currents of the internal fan in a set period duration of at least a set number, and calculating the mean value of the working currents in a corresponding period;
optionally, the period duration is set to be 30s, that is, every 30s is a detection period; acquiring at least two working currents in each set period, and calculating the mean value of all the working currents acquired in the set period to be used as the mean value of the working currents in the period;
here, the air conditioner is provided with a motor for driving the inner fan, and thus, the working motor obtained in step S101 is a current parameter for the air conditioner driving motor to operate;
optionally, the set number is at least 4, that is, the working currents in 4 continuous periods are detected at least, and the mean value of the working currents in each period is calculated respectively;
s202, acquiring working current, air inlet temperature and air outlet temperature of the inner fan in each set period duration;
in this embodiment, the specific execution process of obtaining the working current, the inlet air temperature and the outlet air temperature within each set period duration in step S202 may refer to step S102 in the foregoing;
different from the previous embodiment, step S102 is a method of taking a set of parameters consisting of the working current, the inlet air temperature and the outlet air temperature of the period in which the current control flow is located; step S202, a group of parameters consisting of working current, inlet air temperature and outlet air temperature are respectively obtained in each set period, and if the set number is at least 4, 4 groups of parameters consisting of working current, inlet air temperature and outlet air temperature are obtained;
s203, determining whether the air conditioner has a freezing problem or not according to each working current, the working current mean value, the air inlet temperature and the air outlet temperature corresponding to the previous period of the period where each working current is located.
Optionally, in step S203, it is determined whether the air conditioner has a freezing problem according to each working current, the working current mean value, the air inlet temperature, and the air outlet temperature corresponding to the previous cycle of the cycle in which each working current is located, where the step includes: calculating a current difference value of a working current mean value corresponding to a previous period of the period in which the working current is located; if the quotient of the current difference value and the working current is greater than a preset quotient threshold value, and the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, determining that the air conditioner has a freezing problem; otherwise, determining that the air conditioner has no freezing problem.
For example, when the set number is 4, a first current difference value between the working current of the 2 nd period and the working current mean value of the 1 st period, a second current difference value between the working current of the 3 rd period and the working current mean value of the 2 nd period, and a second current difference value between the working current of the 4 th period and the working current mean value of the 3 rd period are respectively obtained; then, respectively calculating a quotient of the first current difference value and the working current of the 2 nd period, a quotient of the second current difference value and the working current of the 3 rd period, and a quotient of the third current difference value and the working current of the 4 th period; if the three quotient values are all larger than a preset quotient threshold value, the air conditioner meets a current sub-condition for judging that the air conditioner has a freezing problem; at the same time, the user can select the desired position,
respectively calculating temperature difference values of inlet air temperature and outlet air temperature corresponding to the 2 nd period, the 3 rd period and the 4 th period; if the three temperature difference values are all larger than the preset temperature difference threshold value, the air conditioner meets the temperature sub-condition for judging that the air conditioner has the freezing problem;
when it is determined in step S203 that the current sub-condition and the temperature sub-condition are satisfied, it may be determined that the air conditioner has a freezing problem; otherwise, determining that the air conditioner has no freezing problem.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
Or, the anti-freezing mode of the air conditioner switching can also comprise controlling the air conditioner to be switched to the heating mode for operation. Here, for the specific execution flow of switching the air conditioner to the heating mode and the load protection operation when the air conditioner operates in the heating mode, reference may be made to the technical contents disclosed in the foregoing embodiments, and details are not described herein.
In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature and the air outlet temperature of an inner fan; re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature and the air outlet temperature corresponding to the previous period of the period in which the working current is located; and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Optionally, before periodically detecting a plurality of working currents of the internal fan in a set period duration of at least a set number, the control method further includes: and controlling to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.
In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Fig. 3 is a control method for preventing freezing of an air conditioner according to the present invention, shown in accordance with still another exemplary embodiment.
As shown in fig. 3, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s301, periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
in this embodiment, the specific execution flow not shown in S301 may refer to step S101, which is not described herein again;
s302, acquiring the air inlet temperature and the air outlet temperature of the indoor unit;
in this embodiment, the specific execution flow of step S302 may refer to step S201, which is not described herein again;
s303, determining whether the air conditioner has a freezing problem or not according to the working current mean value, the air inlet temperature and the air outlet temperature.
Optionally, in step S303, it is determined whether the air conditioner has a freezing problem according to the working current mean value, the inlet air temperature, and the outlet air temperature, and the specific process may include: if the current difference value between the working current mean values corresponding to two adjacent set period durations is larger than a preset difference threshold value, and the temperature difference value between the inlet air temperature and the outlet air temperature is larger than a preset temperature difference threshold value, determining that the air conditioner has a freezing problem; otherwise, determining that the air conditioner has no freezing problem.
For example, if the current cycle is the nth cycle, the current difference value between the respective working current mean values of the nth-1 and nth cycles is required to be greater than the preset difference threshold in step S303; setting the average value of the working current of the N-1 period as in-1The average value of the working current of the Nth period is inThen according to (i)n-in-1) And comparing the value with a preset difference threshold value, and further judging whether the air conditioner has a freezing problem.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio. In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Or, the anti-freezing mode of the air conditioner switching can also comprise controlling the air conditioner to be switched to the heating mode for operation. Here, for the specific execution flow of switching the air conditioner to the heating mode and the load protection operation when the air conditioner operates in the heating mode, reference may be made to the technical contents disclosed in the foregoing embodiments, and details are not described herein.
In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: after the air conditioner executes anti-freezing operation and continues for a set time length, obtaining the mean value of the working current in at least two set period time lengths; re-determining whether the air conditioner has a freezing problem according to the working current mean value; and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
Here, the above-mentioned process of re-obtaining the average value of the working currents of two set period durations and re-performing the anti-freezing judgment according to the average value can refer to the foregoing steps S301 to S303, which are not described herein again.
Optionally, before periodically detecting a plurality of working currents of the inner fan in the set period duration, the control method further includes: and controlling to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle. In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Fig. 4 is a control method for preventing freezing of an air conditioner according to the present invention, which is shown in accordance with still another exemplary embodiment.
As shown in fig. 4, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s401, periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in a corresponding period;
in this embodiment, the specific execution flow not shown in S401 may refer to step S101, which is not described herein again;
s402, acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of the inner coil of the inner fan;
in this embodiment, in addition to detecting the current working current, the inlet air temperature, and the outlet air temperature by using the content disclosed in step S102 in step S402, the indoor heat exchanger of the indoor unit is further provided with another temperature sensor, which can be used to sense the real-time temperature of the inner coil of the indoor heat exchanger, so that the real-time temperature of the inner coil detected by the temperature sensor is used as the inner coil temperature in step S402;
s403, determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the inner coil temperature corresponding to the previous period of the period where the current working current is located.
Optionally, the specific process in step S403 includes: calculating a current difference value of a working current mean value corresponding to a previous period of a period in which the current working current is located; if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, and the temperature of the inner coil is lower than a preset freezing temperature threshold value, the freezing problem of the air conditioner is determined; otherwise, determining that the air conditioner has no freezing problem.
Here, the specific execution flow of the related technical contents relating to the working current and the inlet and outlet air temperatures may refer to the technical features disclosed in the corresponding parts in the foregoing embodiments;
the freezing temperature threshold is also a preset threshold parameter of the air conditioner, and optionally, the value of the freezing temperature threshold is 0 ℃.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio. In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Or, the anti-freezing mode of the air conditioner switching can also comprise controlling the air conditioner to be switched to the heating mode for operation. Here, for the specific execution flow of switching the air conditioner to the heating mode and the load protection operation when the air conditioner operates in the heating mode, reference may be made to the technical contents disclosed in the foregoing embodiments, and details are not described herein.
In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature, the air outlet temperature and the temperature of an inner coil of an inner fan; re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature, the air outlet temperature and the inner coil temperature corresponding to the previous period of the period in which the working current is located; and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode. Here, the aforementioned process of re-obtaining the working current, the inlet air temperature, the outlet air temperature, and the temperature of the inner coil and re-performing the anti-freezing determination according to the re-obtained working current, inlet air temperature, outlet air temperature, and inner coil temperature may refer to the foregoing step S401 to step S403, which is not described herein again.
Optionally, before periodically detecting a plurality of working currents of the inner fan in the set period duration, the control method further includes: and controlling to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle. In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Fig. 5 is a control method for preventing freezing of an air conditioner according to the present invention, shown in accordance with still another exemplary embodiment.
As shown in fig. 5, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s501, periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in a corresponding period;
in this embodiment, the specific execution flow not performing S501 may refer to step S101, which is not described herein again;
s502, acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of the outer coil of the inner fan;
in this embodiment, in addition to detecting the current working current, the inlet air temperature and the outlet air temperature by using the content disclosed in step S102 in step S502, the outdoor heat exchanger of the outdoor unit is further provided with another temperature sensor, and the temperature sensor can be used for sensing the real-time temperature of the external coil of the outdoor heat exchanger, so that the real-time temperature of the external coil detected by the temperature sensor is used as the external coil temperature in step S502;
s503, determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe, wherein the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe correspond to the previous period of the current working current.
Optionally, the specific process of step S503 includes: calculating a current difference value of a working current mean value corresponding to a previous period of a period in which the current working current is located; if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, and the temperature of the outer coil is lower than a preset freezing temperature threshold value, the freezing problem of the air conditioner is determined; otherwise, determining that the air conditioner has no freezing problem.
Here, the specific execution flow of the related technical contents relating to the working current and the inlet and outlet air temperatures may refer to the technical features disclosed in the corresponding parts in the foregoing embodiments;
the freezing temperature threshold is also a preset threshold parameter of the air conditioner, and optionally, the value of the freezing temperature threshold is-2 ℃.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio. In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Or, the anti-freezing mode of the air conditioner switching can also comprise controlling the air conditioner to be switched to the heating mode for operation. Here, for the specific execution flow of switching the air conditioner to the heating mode and the load protection operation when the air conditioner operates in the heating mode, reference may be made to the technical contents disclosed in the foregoing embodiments, and details are not described herein.
In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of an inner fan; re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe, which correspond to the previous period of the period in which the working current is located; and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode. Here, the aforementioned process of re-obtaining the working current, the inlet air temperature, the outlet air temperature, and the outer coil temperature of the inner fan and re-performing the anti-freezing determination according to the obtained working current, inlet air temperature, outlet air temperature, and outer coil temperature may refer to the foregoing step S501 to step S503, which is not described herein again.
Optionally, before periodically detecting a plurality of working currents of the inner fan in the set period duration, the control method further includes: and controlling to switch the air deflector of the outdoor unit of the air conditioner to the maximum air outlet angle. In this embodiment, the specific execution process of the air conditioner executing the above flow may refer to the technical content disclosed in the corresponding part in the embodiment shown in fig. 1, and is not described herein again.
Fig. 6 is a control method for preventing freezing of an air conditioner according to the present invention, which is shown in accordance with still another exemplary embodiment.
As shown in fig. 6, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s601, acquiring the outer surface temperature of a set area through a scanning device;
the indoor unit of the air conditioner is provided with a scanning device which can scan the outer surface temperature of the set area of the indoor heat exchanger, so that an outer surface temperature distribution diagram reflecting the set area of the indoor heat exchanger can be generated;
here, the set area may be a temperature area to be measured of the pre-defined indoor heat exchanger, and the temperature area to be measured may be composed of one or more dispersed sub-blocks;
alternatively, the scanning device may be an infrared thermal sensor;
s602, determining a freezing area with the outer surface temperature smaller than a preset condensation temperature in the set area;
optionally, according to the temperature data obtained by scanning by the scanning device, the areas of different temperature regions in the outer surface temperature distribution map reflecting the set region of the indoor heat exchanger may be respectively calculated, and then, the areas corresponding to a plurality of temperatures with outer surface temperatures less than the preset condensation temperature are accumulated to obtain the area of the freezing region;
and S603, if the area of the freezing area meets the preset freezing area condition, determining that the indoor heat exchanger of the air conditioner has a freezing problem.
Optionally, the freezing area conditions include: the area of the freezing zone is greater than or equal to a set proportional area of the total area of the set zones. Here, the set ratio is 30%; when the freezing area is larger than or equal to 30% of the total area of the set area, the preset freezing area condition is met; if not, the preset freezing area condition is not met.
The air conditioner and the anti-freezing control method thereof can judge the freezing condition of the air conditioner according to the distribution condition of the outer surface temperature of the indoor heat exchanger obtained by scanning, and can control the air conditioner to perform anti-freezing protection on the indoor heat exchanger in time when the freezing problem of the air conditioner can be judged; the control method for preventing the air conditioner from freezing can enable the air conditioner to trigger self anti-freezing protection more timely and sensitively, avoid overlarge freezing area of the indoor heat exchanger, and ensure safe and stable operation of the air conditioner.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: and controlling the air conditioner to switch to an anti-freezing mode in response to determining that the indoor heat exchanger of the air conditioner has a freezing problem.
Specifically, the freeze prevention mode switched by the air conditioner includes: sequentially executing a plurality of periodic flows defining anti-freeze operations, the periodic flows sequentially including a first periodic flow defining one or more anti-freeze operations to increase an opening degree of a throttle device, and a second periodic flow defining one or more anti-freeze operations to decrease a frequency of a compressor; here, each cycle flow has a set cycle duration; optionally, the cycle durations of the plurality of cycle flows are sequentially reduced.
Illustratively, in response to determining that there is a freezing problem with the indoor heat exchanger of the air conditioner, the air conditioner performs an anti-freezing operation defined by a first periodic flow in which the opening degree of the throttle device is raised to a set opening degree value and maintained for a first period duration of 30 min; the first periodic flow may be performed only 1 time, or, alternatively, continuously performed a plurality of times; then, the air conditioner executes the anti-freezing operation defined by the second period process, namely in the second period process, the frequency value setting frequency value of the compressor is reduced, the running time of the compressor for maintaining the setting frequency value is set to be 10min, and the set time is the second period time; the second cycle flow may be performed only 1 time, or may be performed a plurality of times in succession.
Here, it is redetermined whether there is a freezing problem in the indoor heat exchanger of the air conditioner after the execution of the flow is completed every cycle; after the process is executed in each cycle, executing step S601 to step S603 again, and if the newly determined indoor heat exchanger of the air conditioner does not have a freezing problem, exiting the anti-freezing mode, and at this time, switching the air conditioner back to the original working mode, such as the cooling mode; and if the newly determined indoor heat exchanger of the air conditioner still has the freezing problem, continuously executing the anti-freezing mode according to the original sequence.
In the second periodic flow of the anti-freezing mode, the frequency of the compressor of the air conditioner can be subjected to frequency reduction operation at a set frequency reduction amplitude, so that the frequency reduction amplitude of the compressor can be ensured to be adaptive to the current requirement for anti-freezing protection, and meanwhile, the original frequency can be quickly recovered after the air conditioner finishes the anti-freezing mode; the control method for preventing freezing of the air conditioner further comprises the following steps: and obtaining the attenuation speed of the temperature of the inner coil and the temperature of the inner coil, and matching according to a preset incidence relation to obtain the frequency reduction amplitude of the compressor of the second period process, wherein the incidence relation is used for representing the corresponding relation between the attenuation speed of the temperature of the inner coil and the frequency reduction amplitude.
For example, the air conditioner prestores a corresponding relationship between the attenuation speed for representing the temperature of the inner coil, the temperature of the inner coil and the frequency reduction amplitude, and the correlation relationship can be measured through an experiment before the air conditioner leaves a factory. Before the air conditioner leaves a factory, the defrosting and deicing conditions of the indoor heat exchanger and the time length for the compressor to recover the original frequency after the compressor performs frequency reduction at different amplitudes under the conditions of different attenuation speeds of the temperature of the inner coil and the temperature of the inner coil can be measured and calculated in a simulation experiment mode; and establishing a corresponding relation between the attenuation speed of the temperature of the inner coil, the temperature of the inner coil and the frequency reduction amplitude with the optimal defrosting and deicing time and the shortest restoration time of the compressor according to the measured experimental data.
For example, the association relationship between the two may include: when the decay rate of the temperature of the inner coil is 1.5 ℃/6min and the temperature of the inner coil is less than 7 ℃, the frequency reduction amplitude of the compressor is 20 Hz; when the decay rate of the temperature of the inner coil is 1.2 ℃/6min and the temperature of the inner coil is less than 7 ℃, the frequency reduction amplitude of the compressor is 15 Hz; when the decay rate of the temperature of the inner coil is 1 ℃/6min and the temperature of the inner coil is less than 7 ℃, the frequency reduction amplitude of the compressor is 10 Hz; here, in the pre-stored correspondence, the decay rate of the temperature of the inner coil in the correlation is positively correlated with the frequency reduction amplitude.
Or, the anti-freezing mode of the air conditioner switching can also comprise controlling the air conditioner to be switched to the heating mode for operation. Here, for the specific execution flow of switching the air conditioner to the heating mode and the load protection operation when the air conditioner operates in the heating mode, reference may be made to the technical contents disclosed in the foregoing embodiments, and details are not described herein.
Fig. 7 is a control method for preventing freezing of an air conditioner according to the present invention, shown in accordance with still another exemplary embodiment.
As shown in fig. 7, the present invention further provides another control method for preventing freezing of an air conditioner, which can also be used to solve the problem that the air-out efficiency and the heat exchange efficiency are affected by freezing of a heat exchange tube of an indoor heat exchanger caused by a low-temperature refrigerant when the air conditioner operates in a refrigeration or dehumidification mode; specifically, the method mainly comprises the following steps:
s701, acquiring the outer surface temperature of a set area through a scanning device;
s702, determining a freezing area with the outer surface temperature smaller than a preset condensation temperature in the set area;
s703, if the area of the freezing area meets the preset freezing area condition, determining that the indoor heat exchanger of the air conditioner has a freezing problem;
optionally, the specific execution flow of steps S701 to S703 may refer to steps S601 to S603 in the foregoing, which is not described herein again.
Here, the freezing area conditions include: the area of the freezing zone is greater than or equal to a first set proportion of the total area of the set zones. Optionally, the first set proportion is 30%.
S704, when the air conditioner is determined to have the freezing problem, the anti-freezing operation corresponding to the anti-freezing mode is determined to be started according to the area of the freezing area.
And controlling the air conditioner to switch to the anti-freezing mode in response to the freezing problem of the air conditioner. Before the air conditioner is controlled to be switched to the anti-freezing mode, the anti-freezing operation corresponding to the anti-freezing mode is determined to be started according to the area of the freezing area, and the method comprises the following steps:
if the area of the freezing area is smaller than a preset second set proportion area, the anti-freezing operation corresponding to the anti-freezing operation comprises the following steps: increasing the opening degree of the throttling device;
if the area of the freezing area is larger than the preset second set proportion area and is smaller than or equal to the preset third set proportion area, the anti-freezing operation corresponding to the anti-freezing operation comprises the following steps: controlling to reduce the frequency of the compressor; if it is
If the area of the freezing area is larger than the preset third set proportional area, the anti-freezing operation corresponding to the anti-freezing operation comprises the following steps: controlling the air conditioner to start a heating mode or starting an electric auxiliary heating device arranged in the indoor unit.
Here, the scale values of the first setting scale, the second setting scale, and the third setting scale are sequentially increased. For example, the first set ratio is 30%, the second set ratio is 40%, and the third set ratio is 50%.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: and obtaining the attenuation speed of the temperature of the inner coil and the temperature of the inner coil, and matching according to a preset incidence relation to obtain the frequency reduction amplitude of the corresponding compressor, wherein the incidence relation is used for representing the corresponding relation among the attenuation speed of the temperature of the inner coil, the temperature of the inner coil and the frequency reduction amplitude. Wherein the decay rate of the temperature of the inner coil in the correlation is positively correlated with the frequency reduction amplitude. The specific flow of determining the frequency reduction amplitude of the compressor may refer to the technical content disclosed in the corresponding part of the embodiment shown in fig. 7, and is not described herein again.
Or, the anti-freezing mode of the air conditioner switching can also comprise controlling the air conditioner to be switched to the heating mode for operation. Here, for the specific execution flow of switching the air conditioner to the heating mode and the load protection operation when the air conditioner operates in the heating mode, reference may be made to the technical contents disclosed in the foregoing embodiments, and details are not described herein.
In an alternative embodiment, the present invention further provides an air conditioner capable of performing the control flow disclosed in the embodiment of fig. 1 above.
The air conditioner includes air conditioner organism and controller, and the controller is used for:
periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
acquiring the current working current, the air inlet temperature and the air outlet temperature of the inner fan;
and determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature and the air outlet temperature corresponding to the previous period of the current working current.
Optionally, the controller is specifically configured to:
calculating a current difference value of a working current mean value corresponding to a previous period of a period in which the current working current is located;
if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, and the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, determining that the air conditioner has a freezing problem;
otherwise, determining that the air conditioner has no freezing problem.
Optionally, the controller is further configured to:
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
Optionally, the controller is further configured to:
after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature and the air outlet temperature of an inner fan;
re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature and the air outlet temperature corresponding to the previous period of the period in which the working current is located;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
Optionally, the controller is further configured to control to switch an air deflector of an indoor unit of the air conditioner to the maximum air outlet angle before periodically detecting a plurality of working currents of the inner fan in a set period duration.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of performing the control flow disclosed in the embodiment of fig. 2 above.
The air conditioner includes air conditioner organism and controller, and the controller is used for:
periodically detecting a plurality of working currents of the inner fan in a set period duration of at least a set number, and calculating the mean value of the working currents in a corresponding period;
acquiring working current, air inlet temperature and air outlet temperature of the inner fan in each set period duration;
and determining whether the air conditioner has a freezing problem or not according to each working current, the working current mean value, the air inlet temperature and the air outlet temperature corresponding to the previous period of the period in which each working current is located.
Optionally, the controller is specifically configured to:
calculating a current difference value of a working current mean value corresponding to a previous period of the period in which the working current is located;
if the quotient of the current difference value and the working current is greater than a preset quotient threshold value, and the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, determining that the air conditioner has a freezing problem;
otherwise, determining that the air conditioner has no freezing problem.
Optionally, the controller is further configured to:
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
Optionally, the controller is further configured to:
after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature and the air outlet temperature of an inner fan;
re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature and the air outlet temperature corresponding to the previous period of the period in which the working current is located;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
Optionally, the controller is further configured to control to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle before periodically detecting the plurality of working currents of the inner fan in the set number of set period durations.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of performing the control flow disclosed in the embodiment of fig. 3 above.
The air conditioner includes air conditioner organism and controller, and the controller is used for:
periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
acquiring the air inlet temperature and the air outlet temperature of an indoor unit;
and determining whether the air conditioner has a freezing problem or not according to the working current mean value, the air inlet temperature and the air outlet temperature.
Optionally, the controller is specifically configured to:
if the current difference value between the working current mean values corresponding to two adjacent set period durations is larger than a preset difference threshold value, and the temperature difference value between the inlet air temperature and the outlet air temperature is larger than a preset temperature difference threshold value, determining that the air conditioner has a freezing problem;
otherwise, determining that the air conditioner has no freezing problem.
Optionally, the controller is further configured to:
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
Optionally, the controller is further configured to:
after the air conditioner executes anti-freezing operation and continues for a set time length, obtaining the mean value of the working current in at least two set period time lengths;
re-determining whether the air conditioner has a freezing problem according to the working current mean value;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
Optionally, the controller is further configured to: before a plurality of working currents of the inner fan in a set period duration are periodically detected, the air deflector of the indoor unit of the air conditioner is controlled to be switched to the maximum air outlet angle.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of executing the control flow disclosed in the embodiment of fig. 4 above.
The air conditioner includes air conditioner organism and controller, and the controller is used for:
periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of an inner coil of an inner fan;
and determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the inner coil temperature corresponding to the previous period of the period in which the current working current is located.
Optionally, the controller is specifically configured to:
calculating a current difference value of a working current mean value corresponding to a previous period of a period in which the current working current is located;
if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, and the temperature of the inner coil is lower than a preset freezing temperature threshold value, the freezing problem of the air conditioner is determined;
otherwise, determining that the air conditioner has no freezing problem.
Optionally, the controller is further configured to:
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
Optionally, the controller is further configured to:
after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature, the air outlet temperature and the temperature of an inner coil of an inner fan;
re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature, the air outlet temperature and the inner coil temperature corresponding to the previous period of the period in which the working current is located;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
Optionally, the controller is further configured to control to switch an air deflector of an indoor unit of the air conditioner to the maximum air outlet angle before periodically detecting a plurality of working currents of the inner fan in a set period duration.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of executing the control flow disclosed in the embodiment of fig. 5 above.
The air conditioner includes air conditioner organism and controller, and the controller is used for:
periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of an inner fan;
and determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe corresponding to the previous period of the period in which the current working current is located.
Optionally, the controller is specifically configured to:
calculating a current difference value of a working current mean value corresponding to a previous period of a period in which the current working current is located;
if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, and the temperature of the outer coil is lower than a preset freezing temperature threshold value, the freezing problem of the air conditioner is determined;
otherwise, determining that the air conditioner has no freezing problem.
Optionally, the controller is further configured to:
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes decreasing a current frequency of the compressor to a preset frequency; the predetermined frequency is a product of a current frequency of the compressor and a predetermined ratio.
Optionally, the controller is further configured to:
after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of an inner fan;
re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe, which correspond to the previous period of the period in which the working current is located;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
Optionally, the controller is further configured to control to switch an air deflector of an indoor unit of the air conditioner to the maximum air outlet angle before periodically detecting a plurality of working currents of the inner fan in a set period duration.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of performing the control flow disclosed in the embodiment of fig. 6 above.
The indoor set of air conditioner is provided with the scanning device that can scan the regional surface temperature of setting for of indoor heat exchanger, and the air conditioner still includes the controller, and the controller is used for:
acquiring the outer surface temperature of a set area through a scanning device;
determining a freezing area with the outer surface temperature smaller than a preset condensation temperature in the set area;
and if the area of the freezing area meets the preset freezing area condition, determining that the indoor heat exchanger of the air conditioner has the freezing problem.
Optionally, the freezing area conditions include: the area of the freezing zone is greater than or equal to a set proportional area of the total area of the set zones.
Optionally, the controller is further configured to:
and controlling the air conditioner to switch to an anti-freezing mode in response to determining that the indoor heat exchanger of the air conditioner has a freezing problem.
Optionally, the freeze prevention mode includes:
sequentially executing a plurality of periodic flows defining anti-freeze operations, the periodic flows sequentially including a first periodic flow defining one or more anti-freeze operations to increase an opening degree of a throttle device, and a second periodic flow defining one or more anti-freeze operations to decrease a frequency of a compressor; re-determining whether the indoor heat exchanger of the air conditioner has a freezing problem after the execution of each cycle flow is completed; and if the newly determined indoor heat exchanger of the air conditioner has no freezing problem, exiting the anti-freezing mode.
Optionally, the controller is further configured to:
and acquiring the attenuation speed of the temperature of the inner coil and the temperature of the inner coil, and matching according to a preset incidence relation to obtain the frequency reduction amplitude of the compressor of the corresponding second period process, wherein the incidence relation is used for representing the corresponding relation between the attenuation speed of the temperature of the inner coil, the temperature of the inner coil and the frequency reduction amplitude.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
In an alternative embodiment, the present invention further provides an air conditioner capable of performing the control flow disclosed in the embodiment of fig. 7 above.
The indoor set of air conditioner is provided with the scanning device that can scan the regional surface temperature of setting for of indoor heat exchanger, and the air conditioner still includes the controller, and the controller is used for:
acquiring the outer surface temperature of a set area through a scanning device;
determining a freezing area with the outer surface temperature smaller than a preset condensation temperature in the set area;
if the area of the freezing area meets the preset freezing area condition, determining that the indoor heat exchanger of the air conditioner has a freezing problem; and when the freezing problem of the air conditioner is determined, the anti-freezing operation corresponding to the anti-freezing mode is determined to be started according to the area of the freezing area.
Optionally, the freezing area conditions include: the area of the freezing zone is greater than or equal to a first set proportion of the total area of the set zones.
Optionally, the controller is specifically configured to:
if the area of the freezing area is smaller than a preset second set proportion area, the anti-freezing operation corresponding to the anti-freezing operation comprises the following steps: increasing the opening degree of the throttling device;
if the area of the freezing area is larger than the preset second set proportion area and is smaller than or equal to the preset third set proportion area, the anti-freezing operation corresponding to the anti-freezing operation comprises the following steps: controlling to reduce the frequency of the compressor;
if the area of the freezing area is larger than a preset third set proportion area, the anti-freezing operation corresponding to the anti-freezing operation comprises the following steps: controlling the air conditioner to start a heating mode or starting an electric auxiliary heating device arranged in the indoor unit.
Optionally, the controller is further configured to:
and obtaining the attenuation speed of the temperature of the inner coil and the temperature of the inner coil, and matching according to a preset incidence relation to obtain the frequency reduction amplitude of the corresponding compressor, wherein the incidence relation is used for representing the corresponding relation among the attenuation speed of the temperature of the inner coil, the temperature of the inner coil and the frequency reduction amplitude.
Optionally, the decay rate of the temperature of the inner coil in the correlation is positively correlated to the down-conversion amplitude.
The specific manner of executing the above process by the air conditioner control may refer to the foregoing embodiments, which are not described herein again.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (6)

1. A control method for preventing freezing of an air conditioner is characterized by comprising the following steps:
periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of the inner fan;
according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the outer coil temperature which correspond to the previous period of the period where the current working current is located, whether the air conditioner has the freezing problem or not is determined to specifically comprise the following steps:
calculating a current difference value of a working current mean value corresponding to the current working current and a previous period of the period in which the current working current is located;
if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, and the temperature of the outer coil is lower than a preset freezing temperature threshold value, determining that the air conditioner has a freezing problem; otherwise, determining that the air conditioner has no freezing problem;
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes reducing a current frequency of the compressor to a preset frequency; the preset frequency is the product of the current frequency of the compressor and a preset proportion;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of an inner coil of an indoor heat exchanger; determining the cold-medium temperature according to the exhaust temperature of the compressor and the temperature of an inner coil of the indoor heat exchanger; carrying out load protection operation on the air conditioner according to the cold medium temperature;
the cold medium temperature is calculated according to the following formula,
Tcoil=A*Td+B*Tc+D，
wherein Tcoil is the cold medium temperature, Td is the discharge temperature of the compressor, Tc is the inner coil temperature of the indoor heat exchanger, a is a first calculated coefficient associated with the discharge temperature, B is a second calculated coefficient associated with the inner coil temperature, and D is a calculated constant.
2. The control method according to claim 1, characterized by further comprising:
after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of the inner fan;
re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe, which correspond to the previous period of the period in which the working current is located;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
3. The control method of claim 1, wherein prior to periodically detecting the plurality of operating currents of the inner fan for the set period duration, the control method further comprises:
and controlling to switch the air deflector of the indoor unit of the air conditioner to the maximum air outlet angle.
4. An air conditioner, characterized in that, the air conditioner includes air conditioner organism and controller, the controller is used for:
periodically detecting a plurality of working currents of the inner fan in a set period duration, and calculating the mean value of the working currents in the corresponding period;
acquiring the current working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of the inner fan;
determining whether the air conditioner has a freezing problem or not according to the current working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe corresponding to the previous period of the current working current; the method specifically comprises the following steps:
calculating a current difference value of a working current mean value corresponding to the current working current and a previous period of the period in which the current working current is located;
if the quotient of the current difference value and the current working current is greater than a preset quotient threshold value, the temperature difference value of the inlet air temperature and the outlet air temperature is greater than a preset temperature difference threshold value, and the temperature of the outer coil is lower than a preset freezing temperature threshold value, determining that the air conditioner has a freezing problem; otherwise, determining that the air conditioner has no freezing problem;
in response to determining that the air conditioner has a freezing problem, controlling the air conditioner to switch to an anti-freezing mode; wherein the anti-freeze mode includes reducing a current frequency of the compressor to a preset frequency; the preset frequency is the product of the current frequency of the compressor and a preset proportion;
when the current working mode of the air conditioner is a heating mode, acquiring the exhaust temperature of a compressor and the temperature of an inner coil of an indoor heat exchanger; determining the cold-medium temperature according to the exhaust temperature of the compressor and the temperature of an inner coil of the indoor heat exchanger; carrying out load protection operation on the air conditioner according to the cold medium temperature;
the cold medium temperature is calculated according to the following formula,
Tcoil=A*Td+B*Tc+D，
wherein Tcoil is the cold medium temperature, Td is the discharge temperature of the compressor, Tc is the inner coil temperature of the indoor heat exchanger, a is a first calculated coefficient associated with the discharge temperature, B is a second calculated coefficient associated with the inner coil temperature, and D is a calculated constant.
5. The air conditioner of claim 4, wherein the controller is further configured to:
after the air conditioner executes anti-freezing operation and lasts for a set time, acquiring the working current, the air inlet temperature, the air outlet temperature and the temperature of an outer coil of the inner fan;
re-determining whether the air conditioner has a freezing problem or not according to the working current, the working current mean value, the air inlet temperature, the air outlet temperature and the temperature of the outer coil pipe, which correspond to the previous period of the period in which the working current is located;
and if the air conditioner is determined not to have the freezing problem, controlling the air conditioner to exit the anti-freezing mode.
6. The air conditioner of claim 4, wherein the controller is further configured to control the air deflector of the indoor unit of the air conditioner to switch to the maximum outlet air angle before periodically detecting a plurality of operating currents of the inner fan for a set period duration.
CN201811352010.6A 2018-11-14 2018-11-14 Air conditioner and anti-freezing control method thereof Active CN111189158B (en)

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