CN111189172B - 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
CN111189172B
CN111189172B CN201811352098.1A CN201811352098A CN111189172B CN 111189172 B CN111189172 B CN 111189172B CN 201811352098 A CN201811352098 A CN 201811352098A CN 111189172 B CN111189172 B CN 111189172B
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air conditioner
freezing
temperature
time length
inner coil
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CN111189172A (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

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

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: acquiring parameter information when the air conditioner operates in a refrigeration mode; and in response to the preset anti-freezing condition being met, controlling the air conditioner to operate in an anti-freezing mode in a set period, wherein the set period comprises a plurality of first anti-freezing processes which are sequentially performed and a second anti-freezing process which is at the last order, the second time length for operating the second anti-freezing process is the sum of the first time length for operating the first anti-freezing processes and the compensation time length, and the compensation time length is determined based on the set wind speed gear range in which the rotating speed of the internal fan is located. The air conditioner and the control method for preventing the air conditioner from freezing provided by the invention can operate the anti-freezing mode in the set period when the air conditioner is determined to meet the anti-freezing condition, and can execute the second defrosting process with the prolonged time after the first anti-freezing process is executed for multiple times, so that the anti-freezing effect of the air conditioner on the indoor heat exchanger is improved.

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:
acquiring parameter information when the air conditioner operates in a refrigeration mode;
and in response to the preset anti-freezing condition being met, controlling the air conditioner to operate in an anti-freezing mode in a set period, wherein the set period comprises a plurality of first anti-freezing processes which are sequentially performed and a second anti-freezing process which is at the last order, the second time length for operating the second anti-freezing process is the sum of the first time length for operating the first anti-freezing processes and the compensation time length, and the compensation time length is determined based on the set wind speed gear range in which the rotating speed of the internal fan is located.
In an optional embodiment, the control method further comprises:
acquiring the temperature of an inner coil pipe when the air conditioner operates;
and determining the number of times of the first anti-freezing process executed in each set period based on the temperature of the inner coil.
In an alternative embodiment, the anti-freeze control method further comprises:
and determining a first time length based on the times of the first anti-freezing process executed in each set anti-freezing period.
In an optional embodiment, the control method further comprises:
and determining a first time length based on the set wind speed gear range where the rotating speed of the inner fan is located.
In an alternative embodiment, a wind speed range is set in inverse proportion to the first duration.
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:
acquiring parameter information when the air conditioner operates in a refrigeration mode;
and in response to the preset anti-freezing condition being met, controlling the air conditioner to operate in an anti-freezing mode in a set period, wherein the set period comprises a plurality of first anti-freezing processes which are sequentially performed and a second anti-freezing process which is at the last order, the second time length for operating the second anti-freezing process is the sum of the first time length for operating the first anti-freezing processes and the compensation time length, and the compensation time length is determined based on the set wind speed gear range in which the rotating speed of the internal fan is located.
In an alternative embodiment, the controller is further configured to:
acquiring the temperature of an inner coil pipe when the air conditioner operates;
and determining the number of times of the first anti-freezing process executed in each set period based on the temperature of the inner coil.
In an alternative embodiment, the controller is further configured to:
and determining a first time length based on the times of the first anti-freezing process executed in each set anti-freezing period.
In an alternative embodiment, the controller is further configured to:
and determining a first time length based on the set wind speed gear range where the rotating speed of the inner fan is located.
In an alternative embodiment, a wind speed range is set in inverse proportion to the first duration.
The invention adopts the technical scheme and has the beneficial effects that:
the air conditioner and the control method for preventing the air conditioner from freezing provided by the invention can operate the anti-freezing mode in the set period when the air conditioner is determined to meet the anti-freezing condition, and can execute the second defrosting process with the prolonged time after the first anti-freezing process is executed for multiple times, so that the anti-freezing effect of the air conditioner on the indoor heat exchanger is improved, and the safe and stable operation of the air conditioner is ensured.
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 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.
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, acquiring the temperature of an inner coil pipe when the air conditioner operates in a refrigeration mode, and determining the attenuation rate of the temperature of the inner coil pipe;
as an alternative embodiment, the coil position of the indoor heat exchanger of the air conditioner is provided with a temperature sensor, and the temperature sensor can be used for detecting the real-time temperature of the coil position; in step S101, the real-time temperature of the coil position detected by the temperature sensor is used as the temperature of the inner coil of the current control process.
As an alternative embodiment, in order to determine the decay rate of the inner-coil temperature in step S101, a plurality of inner-coil temperatures may be acquired at a set detection frequency for a set duration (one detection period);
here, the set time period is 18min, and the set detection frequency is 6 min/time.
In this way, the decay rate of the inner coil temperature can be calculated from the plurality of inner coil temperatures. Specifically, data of 4 inner coil temperatures can be obtained within a set time of 18min, and the temperature difference value between two adjacent inner coil temperatures is calculated respectively, so that the variation of the inner coil temperature between two adjacent detection intervals can be obtained. Here, the average value of the temperature difference values in one detection period, that is, the average value of the variation amounts of the temperatures of the plurality of inner coils is used as the decay rate in the inner coil room.
For example, in one detection period, the inner coil temperatures detected by the temperature sensors at intervals of 6min are 65.5 ℃, 64 ℃, 62.5 ℃ and 61 ℃, respectively, the variation of the inner coil temperatures between two adjacent detection intervals is calculated to be 1.5 ℃, 1.5 ℃ and 1.5 ℃, respectively, and the average of 4 variations is calculated to be 1.5 ℃, so that the decay rate of the inner coil temperature can be determined to be 1.5 ℃/6 min.
S102, if the attenuation speed of the temperature of the inner coil and the temperature of the inner coil meet preset anti-freezing conditions, determining that the indoor heat exchanger of the air conditioner has a freezing problem.
Optionally, the preset anti-freezing condition includes: the decay rate of the temperature of the inner coil is greater than or equal to a preset rate threshold, and the temperature of the inner coil is less than a preset temperature threshold.
For example, the preset freeze prevention conditions include: the decay rate of the temperature of the inner coil is more than or equal to 1.5 ℃/6min, and the temperature of the inner coil is less than 7 ℃, wherein 1.5 ℃/6min is a preset rate threshold, and 7 ℃ is a preset temperature threshold; when the attenuation rate of the temperature of the internal coil acquired in the step S101 in the control flow is 1.4 ℃/6min and the temperature of the internal coil is 8 ℃, matching with the anti-freezing condition can determine that the temperature of the internal coil and the attenuation rate thereof in the control flow do not meet the preset anti-freezing condition, and thus it can be determined that the indoor heat exchanger of the air conditioner does not have the freezing problem; and when the decay rate of the temperature of the internal coil acquired in the step S101 in the control flow is executed for another time, the decay rate is 1.7 ℃/6min, and the temperature of the internal coil is 5 ℃, the temperature of the internal coil and the decay rate thereof in the control flow can be determined to meet the preset anti-freezing condition by matching with the anti-freezing condition, and the indoor heat exchanger of the air conditioner can be determined to have the freezing problem.
The air conditioner and the anti-freezing control method thereof can perform the judgment operation of anti-freezing protection according to the temperature of the inner coil and the attenuation rate of the inner coil, so that the air conditioner can be controlled to perform anti-freezing protection on an outdoor unit in time when the problem of freezing of the air conditioner is judged to possibly exist; 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: and in response to the freezing problem of the indoor heat exchanger of the air conditioner, controlling the air conditioner to switch to an anti-freezing mode, wherein the anti-freezing mode comprises controlling and reducing the frequency of a compressor of the air conditioner.
Here, by reducing the frequency of the compressor, the amount of refrigerant conveyed to the air conditioner by the compressor for refrigerant circulation and the discharge temperature of the refrigerant can be reduced, so that the amount of refrigerant flowing into the indoor heat exchanger through the refrigerant circulation is reduced, the temperature of the refrigerant is increased, the temperature environment causing the freezing problem of the indoor heat exchanger can be improved, the frozen frost amount of the indoor heat exchanger is reduced and gradually melted, and the adverse effect of the freezing of the indoor heat exchanger on the heat exchange performance of the air conditioner is effectively reduced.
In 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 matched with 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; therefore, the control method for preventing freezing of the air conditioner further comprises the following steps: and matching according to the attenuation speed of the temperature of the inner coil and 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.
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.
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 coil temperature detected in step S101, where the specific duration of the set duration and the coil temperature are in a negative correlation relationship, that is, the lower the coil temperature 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 coil temperature 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 coil pipe without being limited to the temperature parameter detected by the sensor arranged at the high-temperature refrigerant inflow pipe orifice of the indoor heat exchanger, so that the heat load protection can be accurately judged.
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 a coil of an indoor heat exchanger; determining the cold-medium temperature according to the exhaust temperature of the compressor and the coil temperature 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 a load protection operation when the heating mode is adopted for anti-freezing protection in the above steps.
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 cool-medium temperature according to the discharge temperature of the compressor and the coil temperature 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 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.
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, acquiring the temperature of an inner coil and the rotating speed of an inner fan when the air conditioner operates in a refrigeration mode, and determining the attenuation rate of the temperature of the inner coil;
in this embodiment, the process of obtaining the temperature of the inner coil and determining the decay rate of the temperature of the inner coil may refer to the step S101 in the foregoing, which is not described herein again.
The type of a driving device such as a motor and the like configured by the air conditioner and used for driving the operation of the inner fan is determined information, and the rotating speed of the operation of the inner fan is related to parameters of the motor, such as voltage, current and the like; the current rotating speed of the inner fan can be obtained through conversion according to the model information, the operation parameters and the like of the motor.
S202, if the air conditioner meets the preset anti-freezing condition, determining the running time of the air conditioner switched to the anti-freezing mode according to the attenuation speed of the temperature of the inner coil and the rotating speed of the inner fan.
In step S202, the preset anti-freezing condition may be the same as the anti-freezing condition disclosed in the embodiment of fig. 1, so the determination process of step S202 on whether the air conditioner satisfies the preset anti-freezing condition may refer to step S101 in the foregoing;
alternatively, the anti-freezing condition preset in step S202 may be other existing anti-freezing conditions in the prior art; here, the protection of step S202 is focused not on the setting of the anti-freezing condition and the judgment process, but on the manner of determining the operation time period for switching the air conditioner to the anti-freezing mode according to the decay rate of the temperature of the inner coil and the rotation speed of the inner fan in the case where it is determined that the air conditioner satisfies the anti-freezing condition.
According to the air conditioner and the control method for preventing the air conditioner from freezing, provided by the invention, the running time of the air conditioner switched to the anti-freezing mode can be determined according to the attenuation rate of the temperature of the inner coil and the rotating speed of the inner fan, so that the air conditioner can be controlled to perform anti-freezing protection on an outdoor unit in time when the frosting problem of the air conditioner is judged to possibly exist; 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, as an optional embodiment, when the air conditioner internal fan operates, the heat dissipation rate of the internal coil pipe may also be affected, and the attenuation rate of the temperature of the internal coil pipe may be directly affected, so as to improve the calculation accuracy of the operation duration of the anti-freezing mode, and reduce the error effect caused by the operation of the internal fan; determining the running time of the air conditioner switched to the anti-freezing mode according to the attenuation speed of the temperature of the inner coil and the rotating speed of the inner fan, wherein the running time comprises the following steps: determining a reference time duration based on a decay rate of the inner coil temperature; determining corresponding correction duration according to a set wind speed gear range in which the rotating speed of the inner fan is located; and taking the sum of the reference time length and the correction time length as the operation time length of the anti-freezing mode.
For example, the air conditioner prestores an association relationship between a set wind speed gear and a correction duration, which may also be measured through an experiment before the air conditioner leaves a factory, and for example, the association relationship between the two may include: setting the wind speed gear range as a high wind gear, wherein the correction time is 0 min; when the wind speed gear range is set as a wind stroke gear, the correction time is 0.5 min; setting the reference time length to be 1min when the wind speed gear range is a low wind gear; in the pre-stored association relationship, the set wind speed gear range and the correction duration are in a direct proportion relationship, that is, under the condition of the same attenuation rate of the temperature of the inner coil, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the inner coil is proved to be, the influence of the outdoor environment on the temperature of the inner coil is relatively reduced (namely, the freezing degree is not serious or light), therefore, the correction duration corresponding to the higher set wind speed gear range can be set to be shorter, so that the duration of the operation duration obtained by adding the reference duration and the correction duration is also shorter. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the inner coil is proved to be, and under the condition of the same attenuation rate of the temperature of the inner coil, the influence of the outdoor environment on the temperature of the inner coil is relatively increased (namely, the freezing degree is serious), so that the reference time length corresponding to the lower set wind speed gear range can be set as a longer time length, so that the time length of the operation time length obtained by adding the reference time length and the correction time length is also longer.
Meanwhile, the air conditioner prestores an association relationship between the decay rate of the temperature of the internal coil and the reference duration, and the association relationship can also be measured by an experiment before the air conditioner leaves a factory, for example, the association relationship between the two may include: when the decay rate of the temperature of the inner coil is 1 ℃/6min, the reference time length is 15 min; when the decay rate of the temperature of the inner coil is 1.2 ℃/6min, the reference time length is 20 min; when the decay rate of the temperature of the inner coil is 1.5 ℃/6min, the reference time length is 25 min; here, in the pre-stored correlation, a corresponding relationship in which the attenuation rate of the inner coil is in direct proportion to the reference time length is obtained, that is, the lower the attenuation rate of the temperature of the inner coil of the air conditioner is, it is proved that the temperature of the inner coil is relatively less affected by the outdoor environment (that is, the freezing degree is not serious or light), and therefore, the reference time length corresponding to the lower attenuation rate of the temperature of the inner coil can be set to be the shorter time length. On the contrary, the higher the attenuation rate of the temperature of the inner coil of the air conditioner is, the greater the influence of the inner fan on the temperature change of the inner coil is proved, and the relatively greater the influence of the outdoor environment on the temperature of the inner coil is proved (namely, the freezing degree is severe), so that the reference time length corresponding to the higher attenuation rate of the temperature of the inner coil can be set as the longer time length.
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 coil temperature detected in step S201, where the specific duration of the set duration and the coil temperature are in a negative correlation relationship, that is, the lower the coil temperature 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.
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 coil temperature 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 coil pipe without being limited to the temperature parameter detected by the sensor arranged at the high-temperature refrigerant inflow pipe orifice of the indoor heat exchanger, so that the heat load protection can be accurately judged.
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 a coil of an indoor heat exchanger; determining the cold-medium temperature according to the exhaust temperature of the compressor and the coil temperature of the indoor heat exchanger; and performing load protection operation on the air conditioner according to the cold and medium temperature.
Here, the specific execution process of the load protection operation performed on the air conditioner may refer to the description of the corresponding part of the embodiment 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, acquiring parameter information of the air conditioner in a refrigeration mode;
in this embodiment, the parameter information acquired by the air conditioner is data for determining whether the defrosting trigger condition in step S302 is satisfied; the invention does not limit the type of the trigger condition preset by the air conditioner, and in response, the parameter information acquired in the step S301 is also adjusted according to the specific type of the trigger condition; for example, if an optional trigger condition is that the outdoor ambient temperature is lower than a preset temperature threshold, the parameter information obtained in step S301 includes the outdoor ambient temperature in the current condition and a preset temperature threshold of the air conditioner; yet another optional triggering condition is an accumulated operation duration of the air conditioner after the air conditioner is started to operate, the air conditioner is provided with a timer, and the timer can be used for counting the accumulated operation duration of the air conditioner after the air conditioner is started to operate, so that the parameter information acquired in step S301 includes the accumulated operation duration counted by the timer; etc., to which the present invention is not limited.
S302, in response to the fact that a preset anti-freezing condition is met, controlling the air conditioner to operate in an anti-freezing mode in a set period;
the set period comprises a plurality of first anti-freezing processes which are performed in sequence and a second anti-freezing process which is at the end, the second time length of the second anti-freezing process is the sum of the first time length of the first anti-freezing process and the compensation time length, and the compensation time length is determined based on the set wind speed gear range where the rotating speed of the internal fan is located.
As an optional embodiment, in the process of a single start-up operation of the air conditioner, a plurality of complete anti-freezing processes defined by the set period may be executed for a plurality of times; alternatively, the entire anti-freezing processes defined by the set period may be executed only once; or, one or more anti-freezing processes in the set period can be executed once, and the one or more anti-freezing processes are executed according to the original sequence; alternatively, a plurality of complete anti-freezing processes defined by the setting period may be executed for a plurality of times, in addition to one or more anti-freezing processes in a single setting period, the one or more anti-freezing processes are executed in the original order, and the single setting period is executed in the last of the previous several complete setting periods.
Before each anti-freezing process (including the first anti-freezing process and the second anti-freezing process) of each period is executed, the trigger condition needs to be judged again, if yes, the anti-freezing process in the current sequence is executed, and if not, the anti-freezing process is not executed.
Specifically, taking a single set cycle as an example, the cycle includes 3 first anti-freezing processes (sequence number 1, sequence number 2, and sequence number 3) and 1 second anti-freezing process (sequence number 4) that are performed sequentially; after the air conditioner is started to operate, acquiring parameter information of the operation of the air conditioner in step S301, and determining whether a preset trigger condition is met, if so, executing a first anti-freezing process with a sequence number 1, where the anti-freezing process of the first anti-freezing process has a first duration, and if not, not executing the anti-freezing process, where the air conditioner maintains a current operation state, such as a heating state or an air supply state;
after the first anti-freezing process is finished, the air conditioner is switched to the operation mode before the mode, such as a heating mode;
the air conditioner acquires the parameter information of the air conditioner during operation again, and judges whether the preset trigger condition is met again, if the preset trigger condition is met, the first anti-freezing process with the sequence number 2 is executed, the anti-freezing process time length of the first anti-freezing process is the first time length, if the preset trigger condition is not met, the anti-freezing process is not executed, and the air conditioner maintains the current operation state unchanged, such as a heating state or an air supply state;
triggering and executing the first anti-freezing process with the sequence number 3, and so on;
after the first anti-freezing process of sequence number 3 is finished, the air conditioner is switched to the operation mode before the mode, such as a heating mode;
the air conditioner acquires the parameter information of the air conditioner during operation again, and judges whether the preset trigger condition is met again, if the preset trigger condition is met, the second anti-freezing process with the sequence number 4 is executed, the anti-freezing process time of the second anti-freezing process is the second time, if the preset trigger condition is not met, the anti-freezing process is not executed, and the air conditioner maintains the current operation state unchanged, such as a heating state or an air supply state;
after the second anti-freezing process No. 4 is finished, the air conditioner is switched to the operation mode before the mode, such as the heating mode.
It should be understood that the period set by the present invention does not limit the total duration of the plurality of first anti-freezing flows and the last second anti-freezing flow, but limits the total times of the plurality of first anti-freezing flows and the last second anti-freezing flow; after the single set period is finished, the air conditioner can judge and operate the anti-freezing process again in a new period according to the anti-freezing process.
Here, the adjustment of the air conditioning parameters during the execution of the first anti-freezing flow and the execution of the second anti-freezing flow may be substantially the same.
If the user closes the operation of the air conditioner in a certain anti-freezing process stage or a heating mode stage in a certain set period, resetting the current period; and judging and operating the anti-freezing flow again in a new period when the air conditioner is started for the next time.
The second time length of the operation of the second anti-freezing process is the sum of the first time length of the operation of the first anti-freezing process and the compensation time length, and the compensation time length is determined based on the set wind speed gear range where the rotating speed of the inner fan is located.
Therefore, when the anti-freezing mode is executed or before the second anti-freezing process of the set period of the anti-freezing mode is executed, the rotating speed of the internal fan of the air conditioner needs to be acquired, the compensation duration is determined according to the set wind speed gear range where the rotating speed of the internal fan is located, and the first duration and the compensation duration are added to obtain the second duration of the second anti-freezing process.
For example, the first time duration of the first anti-freezing process is a fixed time duration, and the first time duration is less than the second time duration; therefore, under the condition that the defrosting amount per unit time of the air conditioner running in the anti-freezing mode is not changed, the defrosting amount in the second time period of the second anti-freezing process is also approximately within a certain defrosting amount range, and the defrosting amount in the first time period of the first anti-freezing process is redundant; in the process that the air conditioner executes the first anti-freezing process with the first time length, because the first time length is fixed and the frosting degree of the air conditioner is different every time, frost can not be completely removed in one or more first anti-freezing processes, and therefore, residual frost accumulated in one or more first anti-freezing processes in the front sequence can be removed by adopting the second anti-freezing process with the second time length after the time length is prolonged, so that the defrosting effect of the air conditioner in the set period is ensured, and the phenomenon that excessive frost is accumulated to influence the heat exchange performance of the air conditioner is avoided.
Before the air conditioner leaves a factory, when the internal fan is in different set wind speed gear ranges, the residual frost quantity accumulated by the first anti-freezing process is executed for one time or multiple times in a simulation experiment mode, so that the residual frost quantity accumulated by the first anti-freezing process for the current experiment times can be removed by determining how long the second anti-freezing process needs, and thus, the incidence relation between the times of the first anti-freezing process corresponding to the set wind speed gear ranges and the compensation time can be constructed and stored in the air conditioner.
In this embodiment, after the number of times of the first anti-freezing process is determined, the above-mentioned association relationship may be called, so that the compensation duration corresponding to the current set wind speed gear may be obtained through matching, and further, the second duration of the second anti-freezing process may be obtained through a sum of the first duration and the compensation duration.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: acquiring the temperature of an inner coil pipe when the air conditioner operates; and determining the number of times of the first anti-freezing process executed in each set period based on the temperature of the inner coil.
The temperature of the inner coil is influenced by the heat exchange quantity of the indoor heat exchanger and the indoor environment, the heat exchange quantity of the indoor heat exchanger and the indoor environment is limited by the freezing degree of the indoor unit, and the freezing degree is serious, so that the heat exchange quantity of the indoor heat exchanger and the indoor environment is less, and the temperature of the inner coil is lower; the degree of freezing is lighter, and then indoor heat exchanger and the heat exchanger of indoor environment are more, and then lead to the temperature of interior coil pipe higher.
Here, the correlation between the temperature of the internal coil preset by the air conditioner and the execution times of the first anti-freezing process is a direct relationship, that is, when the temperature of the internal coil is higher, the execution times of the first anti-freezing process are more, which indicates that the freezing degree is lighter, and the residual frost amount accumulated in the indoor unit is less or even none, so that the anti-freezing process can meet the requirement of defrosting the indoor unit by running for the first defrosting time period.
Under the condition that the temperature of the inner coil pipe is lower, the execution times of the first anti-freezing process are less, at this time, the freezing degree is heavier, and the accumulated residual frost quantity of the indoor unit is more, so that the anti-freezing process cannot meet the defrosting requirement of the indoor unit when running for the first defrosting time period, and the accumulated residual frost needs to be removed by the second anti-freezing process for the second defrosting time period; therefore, in this case, the frost flow employs the second anti-freeze flow having a longer time period, and the number of times of execution of the first anti-freeze flow having a shorter time period is reduced.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: and determining a first time length based on the times of the first anti-freezing process executed in each set anti-freezing period.
In this embodiment, the first time duration of the first anti-freezing process in the same set period is a fixed time duration, and the time durations of the first anti-freezing processes in different set periods are the same or different. For different setting periods, because the values of the temperature of the inner coil pipe may be different, the times of the first anti-freezing process determined based on the temperature of the inner coil pipe are also different, so that the first time lengths of the first anti-freezing processes of different setting periods are also different.
For example, the number of times of the first anti-freezing process is in inverse proportion to the first duration; that is, after the number of times of the first anti-freezing process executed in the current period is determined based on the temperature of the internal coil, the more the number of times of the first anti-freezing process is executed, the less the first duration of each anti-freezing process in the period is; the smaller the number of times of executing the first anti-freezing process is, the shorter the first duration of the first anti-freezing process in the period is.
Optionally, when the number of the first anti-freezing processes in the period is 5 times/2 h, the first duration of each first anti-freezing process is 5 min; when the times of the first anti-freezing processes in the period are 7 times/2 h, the first time length of each first anti-freezing process is 3 min; when the number of the first anti-freezing processes in the period is 10/2 h, the first time length of each first anti-freezing process is 2min, and the like.
In order to reduce uncomfortable feelings caused to a user in a set period with more execution times of the first anti-freezing process, the first time length of each first anti-freezing process is limited to be shorter, so that the reduction of the indoor environment temperature in the anti-freezing process is less, and the use experience of the user is ensured; meanwhile, for a set period with a small number of execution times of the first anti-freezing process, in order to ensure the anti-freezing effect on the indoor unit, the first time length of each first anti-freezing process is defined as a longer time length, so that the indoor unit can be defrosted by a sufficient time length in the anti-freezing process.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: and determining a first time length based on the set wind speed gear range where the rotating speed of the inner fan is located.
Here, for example, the air conditioner may have a pre-stored correlation between the set wind speed gear range and the first duration, which may also be measured through experiments before the air conditioner leaves the factory, and the exemplary correlation between the two may include: setting a first time length as 15min when the wind speed gear range is a high wind gear; setting the wind speed gear range as a wind stroke gear, wherein the first time length is 20 min; setting a first time length to be 25min when the wind speed gear range is a low wind gear; here, in the pre-stored association relationship, the set wind speed gear range and the first time length are in an inverse relationship, that is, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the inner coil is proved to be, the smaller the influence of the indoor environment on the temperature of the inner coil is, that is, the less severe or lighter the freezing degree is, so that the first time length corresponding to the higher set wind speed gear range can be set to be the shorter time length. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the inner coil pipe is proved to be, the relatively increased influence of the indoor environment on the temperature of the inner coil pipe is proved to be (namely, the freezing degree is serious), so that the first time length corresponding to the lower set wind speed gear range can be set as the longer time length.
Optionally, the switching of the air conditioner to the anti-freezing mode may further include controlling the air conditioner to switch 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. 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, acquiring the temperature of the inner coil pipe when the air conditioner operates in a refrigeration mode, and determining the highest value of the temperature of the inner coil pipe;
in this embodiment, in order to determine the maximum value of the temperature of the internal coil, the obtained temperature of the internal coil is within a first time period after the air conditioner is started in the refrigeration mode, and a plurality of temperatures of the internal coil are obtained at a set detection frequency;
here, the first time period is 5min, and the detection frequency is set to 10 s/time.
In a first time period after the air conditioner is started, air conditioner components such as a compressor, a throttling device and the like are gradually started, so that the temperature of an inner coil of the air conditioner is fluctuated until a stable state is reached, and the overall temperature change in the process is gradually increased; the highest value of the temperature of the inner coil of the air conditioner is the highest heating performance which can be achieved by the cooperation of all the operation parameters of the air conditioner in the process that the air conditioner reaches a stable state, and the temperature of the inner coil of the air conditioner in the stable state is lower than the highest value.
In this embodiment, the plurality of inner coil temperatures are compared to obtain the highest value of the inner coil temperatures, for example, a total of 31 inner coil temperatures are detected within a first time period defined as 5min, and the 31 inner coil temperatures are compared with each other to obtain the highest value thereof.
In the embodiment, the maximum value of the coil temperature in the step is t1, the temperature value is t2, the threshold value is 10 ℃, and the temperature value t2 is t 1-10.
S402, when the temperature of the inner coil is smaller than a set temperature value, controlling the air conditioner to be switched to an anti-freezing mode;
in the present embodiment, the set temperature value is the difference between the highest value determined in step S401 and the set threshold value.
Setting a threshold as a preset threshold parameter of the air conditioner; optionally, the value of the set threshold is 10 ℃.
The defrosting control method of the air conditioner and the anti-freezing control method thereof can perform anti-freezing judgment operation according to the condition that the temperature of the inner coil is less than the set temperature value, so that the air conditioner can be controlled to perform anti-freezing protection on the outdoor unit in time when the condition that the freezing problem of the air conditioner possibly exists is 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: acquiring the accumulated operation time of a compressor when the air conditioner is started to operate until the current process meets the condition that the temperature of an inner coil is less than a set temperature value; and determining the current operation time length of the anti-freezing mode according to the accumulated operation time length.
The air conditioner is provided with a timing device, after the air conditioner is started and a compressor is started to run, the timing device is started and starts timing operation, and when the condition that the temperature of the inner coil is smaller than the set temperature value is judged in the step S402, the timing device stops timing; the time length counted by the timing device from the time of starting the timing operation to the time of stopping the timing is the accumulated running time length of the compressor.
As an alternative embodiment, determining the current operation period based on the accumulated operation period of the compressor includes: determining a correction period based on the accumulated operation period of the compressor; and taking the sum of the reference time length and the correction time length as the current operation time length.
Here, the air conditioner is preset with an association relationship between the accumulated operation time length of the compressor and the correction time length, wherein in the association relationship, the accumulated operation time length of the compressor is in direct proportion to the correction time length, namely the longer the accumulated operation time length of the compressor is, the longer the correction time length is; the shorter the cumulative operation period of the compressor is, the shorter the correction period is. If the accumulated operation time period T of the compressor is less than or equal to T1, the correction time period is 0; when the accumulated operation time length T of the compressor is greater than T1 and less than or equal to T2, the correction time length is 2 min; when the cumulative operation period T of the compressor is greater than T2, the correction period is 5 min.
The correction duration can be determined according to the accumulated operation duration of the compressor and the correlation, and the current operation duration can be calculated. In the present embodiment, the defrosting racing duration is T0, so that when the cumulative operation duration T of the compressor is less than or equal to T1, the current operation duration is T0; when the accumulated operation time length T of the compressor is greater than T1 and less than or equal to T2, the correction time length is T0+2 min; when the cumulative operation period T of the compressor is greater than T2, the correction period is T0+5 min.
Optionally, when the air conditioner meets the temperature condition that the temperature of the inner coil is less than the set temperature value, the air conditioner is switched to an anti-freezing mode to operate; after the air conditioner operation anti-freezing mode reaches the current operation duration, the air conditioner exits the anti-freezing mode; restarting the anti-freezing mode until the temperature condition is met again; therefore, the air conditioner may execute the anti-freezing mode for multiple times within a long time period after being started for one time, so as to avoid the problem of frost residue after the previous anti-freezing modes are finished; the control method for preventing freezing of the air conditioner further comprises the following steps: acquiring the cumulative times of starting the air conditioner to operate until the current process meets the condition that the temperature of the inner coil is less than a set temperature value; and correcting and compensating the current operation time length according to the accumulated times.
Before the air conditioner leaves the factory, the residual frost quantity accumulated after the anti-freezing process is executed for N-1 times (such as 1 time, 2 times, 3 times and the like) can be measured in a simulation experiment mode, so that the residual frost quantity accumulated in the previous anti-freezing process for N-1 times can be removed by determining how long the anti-freezing process for the Nth time needs to be executed, and thus, the correlation between the anti-freezing process executed for the Nth time and the actual time can be constructed and stored in the air conditioner.
In this embodiment, after the cumulative number of times of starting the anti-icing mode is determined, the above-mentioned association relationship may be called, so that the actual time length required for completely removing the frost from the anti-icing flow in the current sequence may be obtained by matching, and the current running time length may be corrected and compensated according to the actual time length.
Optionally, the anti-freezing mode includes controlling to reduce a frequency of a compressor of the air conditioner; wherein, the frequency reduction amplitude of the compressor is determined according to the following mode: 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.
Here. The specific process for determining the compressor down-conversion amplitude can refer to the corresponding part of the embodiment shown in fig. 1, and is not described herein again.
Optionally, the switching of the air conditioner to the anti-freezing mode may further include controlling the air conditioner to switch 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. 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, acquiring the temperature of an inner coil and the indoor environment temperature when the air conditioner operates in a refrigeration mode, and determining the maximum temperature difference value between the temperature of the inner coil and the indoor environment temperature;
as an alternative embodiment, the coil position of the indoor heat exchanger of the air conditioner is provided with a temperature sensor, and the temperature sensor can be used for detecting the real-time temperature of the coil position; in step S501, the real-time temperature of the coil position detected by the temperature sensor is used as the temperature of the inner coil of the current control process.
In this embodiment, in order to determine the maximum temperature difference value between the temperature of the internal coil and the indoor environment temperature in step S501, the obtained temperature of the internal coil is within a first time period after the air conditioner is turned on, and a plurality of temperatures of the internal coil are obtained at a set detection frequency;
here, the first time period is 5min, and the detection frequency is set to 10 s/time.
In a first time period after the air conditioner is started, air conditioner components such as a compressor, a throttling device and the like are gradually started, so that the temperature of an inner coil of the air conditioner is fluctuated until a stable state is reached, and the overall temperature change in the process is gradually increased; the highest value of the temperature of the inner coil of the air conditioner is the highest heating performance which can be achieved by the cooperation of all the operation parameters of the air conditioner in the process that the air conditioner reaches a stable state, and the temperature of the inner coil of the air conditioner in the stable state is lower than the highest value.
In this embodiment, the plurality of inner coil temperatures are compared to obtain the highest value of the inner coil temperatures, for example, a total of 31 inner coil temperatures are detected within a first time period defined as 5min, and the 31 inner coil temperatures are compared with each other to obtain the highest value thereof.
Meanwhile, the air conditioner is also provided with another temperature sensor which can be used for detecting the real-time temperature of the indoor environment where the air conditioner is located; in step S501, the implementation temperature of the indoor environment detected by the temperature sensor is used as the indoor environment temperature of the current control flow.
Here, the two temperature sensors are used for synchronous detection, so that the temperature of a plurality of groups of internal coils and the indoor environment temperature can be finally obtained; respectively calculating the temperature difference value of the temperature of the inner coil pipe and the indoor environment temperature of each group; and comparing the temperature difference values to obtain the maximum temperature difference value.
S502, when the temperature difference value between the temperature of the inner coil and the indoor environment temperature is smaller than the set temperature difference value, controlling the air conditioner to switch to an anti-freezing mode, wherein the set temperature difference value is the difference between the maximum temperature difference value and the set threshold value.
Here, the set temperature difference value is a difference between the maximum temperature difference value and the set threshold value. In an embodiment, the maximum temperature difference between the temperature of the inner coil and the indoor ambient temperature determined in step S301 is Δ t1, the temperature difference is Δ t2, the threshold is 10 ℃, and then the temperature value Δ t2 is set to Δ t 1-10.
The method comprises the steps that an anti-freezing mode is not triggered in a first time period when the air conditioner is started, and the maximum temperature difference value between the temperature of an inner coil and the indoor environment temperature in the first time period is determined; the two temperature sensors continue to detect the temperature of the inner coil pipe and the indoor environment temperature at set detection frequency, and calculate to obtain the temperature difference value of the temperature of the inner coil pipe and the indoor environment temperature obtained by each detection; the temperature difference value compared with the set temperature difference value in the step S502 is the temperature difference value between the temperature of the inner coil and the indoor environment temperature detected after the end of the first time period, and if the condition that the temperature difference value is smaller than the set temperature difference value Δ t2 is met in the operation time period after the first time period, the air conditioner is controlled to be switched to the anti-freezing mode, so as to perform anti-freezing protection on the indoor unit of the air conditioner.
According to the comparison result of the temperature difference value and the set temperature difference value, whether the air conditioner is switched to the anti-freezing mode or not is determined, and the method has the advantages that: the highest value of the temperature of the inner coil of the air conditioner is the highest refrigerating performance which can be achieved by the cooperation of all operation parameters of the air conditioner in the process that the air conditioner reaches a stable state, the temperature of the indoor environment also changes along with the starting operation of the air conditioner, and the temperature change of the inner coil is influenced by the freezing condition of the indoor unit, for example, when the indoor unit is seriously frozen, the temperature of the inner coil is reduced, the temperature reduction rate of the indoor environment temperature which is simultaneously influenced by the air conditioner and the indoor environment is reduced, even the temperature is increased (the heat absorption capacity of an indoor heat exchanger is reduced, and meanwhile, the heat dissipated to the indoor environment by the outdoor environment is increased), so the temperature difference of the temperature of the inner coil and the temperature of the indoor environment is enlarged; when the indoor unit has no freezing problem, the air conditioner is in a stable state, the temperature of the inner coil pipe is close to the maximum value, and the indoor environment temperature is also close to the target refrigerating temperature set by a user; therefore, whether the indoor unit of the air conditioner has a freezing problem can be further deduced by judging the temperature difference between the temperature difference value and the set temperature difference value; here, when the temperature difference value is smaller than the set temperature difference value, that is, the temperature difference between the temperature difference value and the maximum temperature difference value exceeds the set threshold, for example, the temperature difference exceeds 10 ℃, the temperature change range between the temperature of the inner coil and the indoor environment temperature is relatively large, so that it can be determined that the temperature of the inner coil is decreased and the indoor environment temperature is increased due to the freezing problem, and the anti-freezing treatment needs to be performed on the indoor unit of the air conditioner in time.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: acquiring the accumulated operation time length of a compressor when the air conditioner is started and operated until the process meets the condition that the temperature difference value between the temperature of the inner coil and the indoor environment temperature is smaller than a set temperature difference value; and determining the current operation time length of the anti-freezing mode according to the accumulated operation time length.
In this embodiment, the above process may refer to an embodiment corresponding to fig. 4, "obtaining an accumulated operation duration of the compressor when the air conditioner is started up and operated until the current process meets the condition that the temperature of the internal coil is less than the set temperature value; determining the current operation duration of the freeze prevention mode according to the accumulated operation duration, and the like, which are not described herein again.
Optionally, the method for controlling freezing prevention of an air conditioner of the present invention further comprises: acquiring the cumulative times of starting an anti-freezing mode of the air conditioner when the air conditioner is started and operated until the current process meets the condition that the temperature difference value between the temperature of the inner coil and the indoor environment temperature is smaller than a set temperature difference value; and correcting and compensating the current operation time length according to the accumulated times.
In this embodiment, the above-mentioned process may refer to the embodiment corresponding to fig. 4, "obtaining the cumulative number of times that the air conditioner starts the anti-freezing mode when the air conditioner is started and operated until the current process meets the condition that the temperature of the internal coil is less than the set temperature value; the execution process of the technical content, such as "performing correction compensation on the current running time according to the accumulated times" is not described herein.
Optionally, the anti-freezing mode includes controlling to reduce a frequency of a compressor of the air conditioner; wherein, the frequency reduction amplitude of the compressor is determined according to the following mode: 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.
Here. The specific process for determining the compressor down-conversion amplitude can refer to the corresponding part of the embodiment shown in fig. 1, and is not described herein again.
Optionally, the switching of the air conditioner to the anti-freezing mode may further include controlling the air conditioner to switch 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:
acquiring the temperature of an inner coil pipe when the air conditioner operates in a refrigeration mode, and determining the attenuation rate of the temperature of the inner coil pipe;
and if the attenuation speed of the temperature of the inner coil and the temperature of the inner coil meet preset anti-freezing conditions, determining that the indoor heat exchanger of the air conditioner has the freezing problem.
Optionally, the preset anti-freezing condition includes: the decay rate of the temperature of the inner coil is greater than or equal to a preset rate threshold, and the temperature of the inner coil is less than a preset temperature threshold.
Optionally, the controller is further configured to:
and in response to the freezing problem of the indoor heat exchanger of the air conditioner, controlling the air conditioner to switch to an anti-freezing mode, wherein the anti-freezing mode comprises controlling and reducing the frequency of a compressor of the air conditioner.
Optionally, the controller is further configured to:
and matching according to the attenuation speed of the temperature of the inner coil and 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.
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:
acquiring the temperature of an inner coil and the rotating speed of an inner fan when the air conditioner operates in a refrigeration mode, and determining the attenuation rate of the temperature of the inner coil;
and if the air conditioner meets the preset anti-freezing condition, determining the running time of the air conditioner switched to the anti-freezing mode according to the attenuation speed of the temperature of the inner coil and the rotating speed of the inner fan.
Optionally, the controller is specifically configured to:
determining a reference time duration based on a decay rate of the inner coil temperature;
determining corresponding correction duration according to a set wind speed gear range in which the rotating speed of the inner fan is located;
and taking the sum of the reference time length and the correction time length as the operation time length of the anti-freezing mode.
Optionally, a corresponding relationship that the wind speed gear range and the correction duration are in direct proportion is set.
Optionally, the decay rate of the inner coil is proportional to the reference duration.
Optionally, the controller is specifically configured to:
acquiring a plurality of internal coil temperatures at a set detection frequency within a set duration;
and calculating the decay rate of the temperature of the inner coil according to the temperatures of the plurality of inner coils.
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:
acquiring parameter information when the air conditioner operates in a refrigeration mode;
and in response to the preset anti-freezing condition being met, controlling the air conditioner to operate in an anti-freezing mode in a set period, wherein the set period comprises a plurality of first anti-freezing processes which are sequentially performed and a second anti-freezing process which is at the last order, the second time length for operating the second anti-freezing process is the sum of the first time length for operating the first anti-freezing processes and the compensation time length, and the compensation time length is determined based on the set wind speed gear range in which the rotating speed of the internal fan is located.
Optionally, the controller is further configured to:
acquiring the temperature of an inner coil pipe when the air conditioner operates;
and determining the number of times of the first anti-freezing process executed in each set period based on the temperature of the inner coil.
Optionally, the controller is further configured to:
and determining a first time length based on the times of the first anti-freezing process executed in each set anti-freezing period.
Optionally, the controller is further configured to:
and determining a first time length based on the set wind speed gear range where the rotating speed of the inner fan is located.
Optionally, a corresponding relationship that the wind speed gear range and the first duration are in inverse proportion is set.
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:
acquiring the temperature of an inner coil pipe when the air conditioner operates in a refrigeration mode, and determining the highest value in the temperature of the inner coil pipe;
and when the temperature of the inner coil pipe is lower than a set temperature value, controlling the air conditioner to switch to an anti-freezing mode, wherein the set temperature value is the difference between the maximum value and the set threshold value.
Optionally, the controller is further configured to:
acquiring the accumulated operation time of a compressor when the air conditioner is started to operate until the current process meets the condition that the temperature of an inner coil is less than a set temperature value;
and determining the current operation time length of the anti-freezing mode according to the accumulated operation time length.
Optionally, the controller is further configured to:
acquiring the cumulative times of starting the air conditioner to operate until the current process meets the condition that the temperature of the inner coil is less than a set temperature value;
and correcting and compensating the current operation time length according to the accumulated times.
Optionally, the anti-freezing mode includes controlling to reduce a frequency of a compressor of the air conditioner;
wherein 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.
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:
acquiring the temperature of an inner coil and the indoor environment temperature when the air conditioner operates in a refrigeration mode, and determining the maximum temperature difference value between the temperature of the inner coil and the indoor environment temperature;
and when the temperature difference value between the temperature of the inner coil and the indoor environment temperature is smaller than a set temperature difference value, controlling the air conditioner to switch to an anti-freezing mode, wherein the set temperature difference value is the difference between the maximum temperature difference value and a set threshold value.
Optionally, the controller is further configured to:
acquiring the accumulated operation time length of a compressor when the air conditioner is started and operated until the process meets the condition that the temperature difference value between the temperature of the inner coil and the indoor environment temperature is smaller than a set temperature difference value;
and determining the current operation time length of the anti-freezing mode according to the accumulated operation time length.
Optionally, the controller is further configured to:
acquiring the cumulative times of starting an anti-freezing mode of the air conditioner when the air conditioner is started and operated until the current process meets the condition that the temperature difference value between the temperature of the inner coil and the indoor environment temperature is smaller than a set temperature difference value;
and correcting and compensating the current operation time length according to the accumulated times.
Optionally, the anti-freezing mode includes controlling to reduce a frequency of a compressor of the air conditioner;
wherein 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 rate 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 rate.
Optionally, the decay rate of the temperature of the inner coil in the correlation is positively correlated to the down-conversion rate.
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 (8)

1. A control method for preventing freezing of an air conditioner is characterized by comprising the following steps:
acquiring parameter information when the air conditioner operates in a refrigeration mode;
in response to the fact that a preset anti-freezing condition is met, controlling the air conditioner to operate in an anti-freezing mode in a set period, wherein the set period comprises a plurality of first anti-freezing processes which are sequentially performed and a second anti-freezing process which is at the end, the second time length for operating the second anti-freezing process is the sum of the first time length for operating the first anti-freezing processes and a compensation time length, and the compensation time length is determined based on a set wind speed gear range where the rotating speed of an internal fan is located;
wherein, the number of times of determining the first anti-freezing process is as follows: acquiring the temperature of an inner coil pipe when the air conditioner operates; determining the number of times of a first anti-freezing process executed in each set period based on the temperature of the inner coil; the temperature of the inner coil pipe is in direct proportion to the execution times of the first anti-freezing process.
2. The control method according to claim 1, wherein the anti-freezing control method further includes:
and determining the first time length based on the number of times of the first anti-freezing process executed in each set period.
3. The control method according to claim 1, characterized by further comprising:
and determining the first time length based on the set wind speed gear range in which the rotating speed of the inner fan is located.
4. The control method according to claim 3, wherein the set wind speed range corresponds to an inverse proportion of the first period of time.
5. An air conditioner, characterized in that, the air conditioner includes air conditioner organism and controller, the controller is used for:
acquiring parameter information when the air conditioner operates in a refrigeration mode;
in response to the fact that a preset anti-freezing condition is met, controlling the air conditioner to operate in an anti-freezing mode in a set period, wherein the set period comprises a plurality of first anti-freezing processes which are sequentially performed and a second anti-freezing process which is at the end, the second time length for operating the second anti-freezing process is the sum of the first time length for operating the first anti-freezing processes and a compensation time length, and the compensation time length is determined based on a set wind speed gear range where the rotating speed of an internal fan is located;
wherein, the number of times of determining the first anti-freezing process is as follows: acquiring the temperature of an inner coil pipe when the air conditioner operates; determining the number of times of a first anti-freezing process executed in each set period based on the temperature of the inner coil; the temperature of the inner coil pipe is in direct proportion to the execution times of the first anti-freezing process.
6. The air conditioner of claim 5, wherein the controller is further configured to:
and determining the first time length based on the number of times of the first anti-freezing process executed in each set period.
7. The air conditioner of claim 5, wherein the controller is further configured to:
and determining the first time length based on the set wind speed gear range in which the rotating speed of the inner fan is located.
8. The air conditioner of claim 7, wherein the set wind speed gear range corresponds to an inverse proportion of the first time period.
CN201811352098.1A 2018-11-14 2018-11-14 Air conditioner and anti-freezing control method thereof Active CN111189172B (en)

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CN102022872B (en) * 2010-12-03 2011-12-07 劳特斯空调(江苏)有限公司 Defrosting control method for intelligent air cooling heat pump
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Effective date of registration: 20211015

Address after: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao

Applicant after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd.

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Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao

Applicant before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd.