CN115183400A - Air conditioner and defrosting control method thereof - Google Patents

Air conditioner and defrosting control method thereof Download PDF

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Publication number
CN115183400A
CN115183400A CN202210760704.3A CN202210760704A CN115183400A CN 115183400 A CN115183400 A CN 115183400A CN 202210760704 A CN202210760704 A CN 202210760704A CN 115183400 A CN115183400 A CN 115183400A
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China
Prior art keywords
temperature
air conditioner
outdoor coil
outdoor
indoor
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Granted
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CN202210760704.3A
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Chinese (zh)
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CN115183400B (en
Inventor
张素珍
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Hisense Air Conditioning Co Ltd
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Hisense Air Conditioning Co Ltd
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Priority to CN202210760704.3A priority Critical patent/CN115183400B/en
Publication of CN115183400A publication Critical patent/CN115183400A/en
Priority to PCT/CN2023/082785 priority patent/WO2024001320A1/en
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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
    • F24F11/42—Defrosting; Preventing freezing of outdoor 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • F24F2140/40—Damper positions, e.g. open or closed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an air conditioner and a defrosting control method of the air conditioner. Wherein, the air conditioner includes: compressor, indoor heat exchanger, outdoor heat exchanger, throttling arrangement, indoor fan, first temperature sensor, second temperature sensor and controller, the controller is configured as: when the air conditioner is in heating operation, acquiring the operating frequency of a compressor of the air conditioner, determining that the increase value of the operating frequency in a preset period exceeds a preset frequency threshold value, and controlling the air conditioner to enter a false defrosting mode; the method comprises the steps that from the moment of entering a false defrosting mode, the temperature of an outdoor coil and the temperature of an indoor coil are obtained, the temperature of the outdoor coil at the (n + 1) th moment is determined to be smaller than the temperature of the outdoor coil at the nth moment, the air conditioner is controlled to keep heating operation so as not to defrost outdoors, wherein n is a natural number; and when the temperature of the outdoor coil pipe is kept unchanged for a first preset time period and the temperature of the indoor coil pipe and the indoor wind speed are also kept unchanged for the first preset time period, controlling the air conditioner to exit the false defrosting mode.

Description

Air conditioner and defrosting control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a defrosting control method of the air conditioner.
Background
Winter is when outdoor ambient temperature is lower, during the long-time operation mode of heating of air conditioner, the off-premises station of air conditioner is evaporation side and is easily frosted, and then can lead to heating the effect and descend, and thick along with the increase frost layer of frosting time, the frost layer can increase the heat transfer thermal resistance of the outer machine of air-conditioner, lead to outdoor air circulation area to reduce, the flow resistance increases, can lead to the amount of wind of off-premises station to reduce, and then can make outdoor evaporating temperature further reduce, the heat exchange worsens, and reduce indoor environment travelling comfort, can't satisfy user's demand, reduce user experience. Therefore, after the air conditioner operates for a period of time, it needs to be defrosted timely and effectively. The existing defrosting technologies mainly comprise refrigeration mode (reverse cycle) defrosting, bypass defrosting and phase-change energy storage defrosting.
In the related art, when the air conditioner is defrosted in the cooling mode, whether the defrosting condition is met is judged by adopting an outdoor loop temperature Tout and an outdoor heat exchange temperature difference delta Tout, wherein the outdoor heat exchange temperature difference delta Tout = the outdoor loop temperature Tout-the outdoor coil temperature T Outer plate . In the mode, on the occasion of entering the defrosting mode, for some special scenes such as indoor temperature difference increase or indoor wind speed increase, the operation frequency F suddenly rises to enable T Outer plate And rapidly reducing, suddenly increasing the outdoor heat exchange temperature difference delta Tout to meet the defrosting condition, and entering a defrosting mode. However, at this time, the outdoor heat exchanger has no frost or very thin frost, the heating capability is very strong, the defrosting mode is executed, the room temperature fluctuates greatly, the comfort level of the user is reduced, and energy is additionally consumed.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one of the objectives of the present invention is to provide an air conditioner, which can effectively avoid the phenomena of defrosting without frost and frequent defrosting, and can exit the false defrosting mode in time, avoid additional energy consumption, and ensure the experience of the user.
The second objective of the present invention is to provide a defrosting control method for an air conditioner.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an air conditioner, including: the system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a throttling device and an indoor fan; the first temperature sensor is used for collecting the temperature of an indoor coil of the indoor heat exchanger; the second temperature sensor is used for collecting the temperature of an outdoor coil of the outdoor heat exchanger; a controller connected to the compressor, the first temperature sensor, and the second temperature sensor, respectively, the controller configured to: when the air conditioner is in heating operation, acquiring the operating frequency of a compressor of the air conditioner, determining that the increase value of the operating frequency in a preset period exceeds a preset frequency threshold value, and controlling the air conditioner to enter a false defrosting mode; starting from the moment of entering the false defrosting mode, acquiring the temperature of the outdoor coil and the temperature of the indoor coil, determining that the temperature of the outdoor coil at the (n + 1) th moment is less than the temperature of the outdoor coil at the nth moment, and controlling the air conditioner to keep heating operation so as not to defrost outdoors, wherein n is a natural number; and when the temperature of the outdoor coil pipe is kept unchanged within a first preset time period and the temperature of the indoor coil pipe and the indoor wind speed are also kept unchanged within the first preset time period, controlling the air conditioner to exit the false defrosting mode.
According to the air conditioner provided by the embodiment of the invention, the air conditioner is controlled to enter the false defrosting mode by detecting the operating frequency of the compressor in real time and determining that the increasing value of the operating frequency of the compressor in the preset period exceeds the preset frequency threshold value. The first temperature sensor and the second temperature sensor are used for acquiring the indoor coil temperature and the outdoor coil temperature in real time, and further data reference can be provided for the current operation strategy of the air conditioner. The phenomenon of defrosting due to frostless and frequent defrosting can be effectively avoided under the unsteady state that the temperature of the outdoor coil and the temperature of the indoor coil are changed due to the change of the operating frequency of the compressor, and the control is more accurate. And after the air conditioning system is determined to fluctuate and tend to be stable, the air conditioner is controlled to exit the false defrosting mode in time to operate the conventional heating mode, extra energy consumption is avoided, the experience of a user is guaranteed, and the requirement of the user on the comfort level under the heating working condition is met.
In some embodiments of the invention, the controller is configured to: when the outdoor coil temperature at the (n + 1) th moment is determined to be lower than the outdoor coil temperature at the nth moment, the frequency that the outdoor coil temperature at the (n + 1) th moment is lower than the outdoor coil temperature at the nth moment is determined to reach a preset frequency, wherein the preset frequency is more than or equal to 2 times.
In some embodiments of the invention, the controller is configured to: and detecting that the air conditioner starts a heating mode and the continuous operation time reaches a second preset time, wherein the second preset time is less than or equal to 11min and is less than or equal to 9 min.
In some embodiments of the invention, the controller is further configured to: after determining that the outdoor coil temperature at the (n + 1) th moment is less than the outdoor coil temperature at the nth moment, further determining that the outdoor coil temperature rises again after falling, the outdoor coil temperature remains unchanged after rising to the first temperature, the outdoor coil temperature decreases again to a second temperature after the duration of the first temperature being unchanged reaches the first duration, and the operating frequency of the compressor increases until the first frequency is unchanged, and controlling the air conditioner to perform outdoor defrosting, wherein the second temperature reaches the defrosting temperature.
In some embodiments of the invention, the preset period is less than or equal to 1s and less than or equal to 1min, the preset frequency threshold is greater than or equal to 3Hz, and the first preset duration is less than or equal to 1min and less than or equal to 5min.
In order to achieve the above object, a defrosting control method for an air conditioner according to an embodiment of a second aspect of the present invention includes: detecting the heating operation of the air conditioner, and acquiring the operating frequency of a compressor of the air conditioner; determining that the increase value of the operating frequency exceeds a preset frequency threshold value in a preset period, and controlling the air conditioner to enter a false defrosting mode; the method comprises the steps of obtaining the temperature of an outdoor coil and the temperature of an indoor coil from the moment of entering a false defrosting mode, determining that the temperature of the outdoor coil at the (n + 1) th moment is smaller than the temperature of the outdoor coil at the nth moment, and controlling the air conditioner to keep heating operation so as not to defrost outdoors, wherein n is a natural number; and when the temperature of the outdoor coil pipe is kept unchanged within a first preset time period and the temperature of the indoor coil pipe and the indoor wind speed are also kept unchanged within the first preset time period, controlling the air conditioner to exit the false defrosting mode.
According to the defrosting control method of the air conditioner, provided by the embodiment of the invention, a false defrosting mode is provided, and the air conditioner is not controlled to operate in the defrosting mode under the unsteady state that the temperature of the outdoor coil, the temperature of the indoor coil and the indoor wind speed are changed due to the change of the operating frequency of the compressor when the air conditioner operates in heating mode, even if the temperature difference between the outdoor coil and the outdoor heat exchange meets the condition of entering the defrosting mode. According to the method provided by the embodiment of the invention, the control parameter of the preset frequency threshold is introduced, when the fact that the increasing value of the running frequency of the compressor in the preset period exceeds the preset frequency threshold is detected, the air conditioner is controlled to enter the false defrosting mode, the temperature of the outdoor coil pipe caused by system fluctuation and the temperature of the indoor coil pipe are stabilized again after being changed, and the indoor air speed is unchanged, the air conditioner is controlled to exit the false defrosting mode in time to run the conventional heating mode, the phenomena of defrosting without frost and frequent defrosting can be effectively avoided, the method is more accurate, extra energy consumption is avoided, the experience feeling of a user is guaranteed, and the requirement of the user on the comfort level under the heating working condition is met.
In some embodiments of the present invention, determining that the outdoor coil temperature at time (n + 1) is less than the outdoor coil temperature at time n comprises: and determining that the continuous preset times of the outdoor coil temperature meet the condition that the outdoor coil temperature at the (n + 1) th moment is less than the outdoor coil temperature at the nth moment, wherein the preset times are more than or equal to 2.
In some embodiments of the invention, the preset period is less than or equal to 1s and less than or equal to 1min, the preset frequency threshold is greater than or equal to 3Hz, and the first preset duration is less than or equal to 1min and less than or equal to 5min.
In some embodiments of the present invention, the air conditioner defrosting control method further includes: after determining that the outdoor coil temperature at the (n + 1) th moment is less than the outdoor coil temperature at the nth moment, further determining that the outdoor coil temperature rises again after falling, the outdoor coil temperature remains unchanged after rising to the first temperature, the outdoor coil temperature decreases again to a second temperature after the duration of the first temperature being unchanged reaches the first duration, and the operating frequency of the compressor increases until the first frequency is unchanged, and controlling the air conditioner to perform outdoor defrosting, wherein the second temperature reaches the defrosting temperature.
In some embodiments of the present invention, the detecting of the air conditioner heating operation includes: and detecting that the air conditioner starts a heating mode and the continuous operation time reaches a second preset time, wherein the second preset time is less than or equal to 11min and is less than or equal to 9 min.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of an air conditioner.
Fig. 2 is a block diagram of an air conditioner according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an air conditioner according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of the outdoor unit coil temperature affected by the operating frequency of the compressor in accordance with one embodiment of the present invention;
FIG. 5 is a flowchart of a defrosting control method of an air conditioner according to an embodiment of the present invention;
fig. 6 is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention;
fig. 7 is a flowchart of a defrosting control method of an air conditioner according to still another embodiment of the present invention;
fig. 8 is a flowchart of a defrosting control method of an air conditioner according to still another embodiment of the present invention;
fig. 9 is a flowchart of a defrosting control method of an air conditioner according to still another embodiment of the present invention;
fig. 10 is a block diagram of an air conditioner according to another embodiment of the present invention.
Reference numerals:
an air conditioner 10;
a processor 101, a memory 102;
the air conditioner comprises a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a throttling device 4, an indoor fan 5, a first temperature sensor 6, a second temperature sensor 7, a controller 8 and a four-way valve N.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The existing defrosting technologies mainly comprise refrigeration mode (reverse cycle) defrosting, bypass defrosting and phase-change energy storage defrosting. When the defrosting is carried out by adopting a refrigeration mode, the indoor heat exchanger is used as an evaporation end, so that the indoor environment temperature is obviously reduced, the heating effect of the air conditioner is influenced, and the comfort experience of a user is influenced. But the adoption of the reverse circulation mode does not need other complex parts, and has the advantages of simple system, mature technology, low cost and the like. When the bypass defrosting mode is adopted, the refrigerant can continuously enter the air conditioner indoor unit for heating, so that the air conditioner can still maintain the heating condition, the heating cycle of the unit is not required to be changed, and the defrosting purpose is achieved by utilizing the heat released by the exhaust. Therefore, compared with the reverse cycle defrosting, the bypass defrosting mode can ensure the indoor comfort. However, the time of hot gas bypass defrosting is longer and is more than 2 times of that of reverse cycle defrosting. The defrosting of phase change heat storage, reverse cycle defrosting and bypass defrosting all have the not enough problem of heat source, and the heat storage defrosting is under the heating mode, gets up partial heat storage, is giving out the heat when needing the defrosting, and the mode of often adopting the parcel compressor carries out the energy storage, nevertheless under the refrigeration mode in summer, influences the press heat dissipation, easily leads to exhaust temperature too high, and the heat accumulator energy storage is limited simultaneously, at present not generally applied.
The existing air conditioner generally adopts a refrigeration mode (reverse cycle) defrosting mode, and in order to ensure that the heating efficiency of the indoor environment is not influenced, the outdoor unit is effectively defrosted in time, so that defrosting or excessive frosting caused by frost is avoided. When the refrigeration mode is adopted for defrosting, the indoor heat exchanger is used as an evaporation end, so that the indoor environment temperature is obviously reduced, the heating effect of the air conditioner is influenced, and the comfort experience of a user is influenced. Especially, in some special scenes, for example, the temperature of the outdoor coil pipe is rapidly reduced due to the sudden increase of the operating frequency of the compressor, so that the outdoor heat exchange temperature difference Δ Tout is suddenly increased to meet the defrosting condition, and then defrosting is performed. However, since there is no frost or the frost is very thin on the outdoor heat exchanger, the heating capability is very strong, and the defrosting mode is performed, which causes the room temperature to fluctuate greatly, reduces the comfort of the user, and also consumes additional energy.
Based on the above, in order to solve the problems that the operating frequency of the compressor suddenly rises to cause the temperature of the outdoor coil to rapidly drop, so that the outdoor heat exchange temperature difference Δ Tout suddenly increases to meet the defrosting condition, and further the air conditioner has no frost and is defrosted, the embodiment of the invention provides an air conditioner defrosting control method and an air conditioner adopting the method.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic view of an air conditioner, the basic structure of which can be understood in conjunction with fig. 1, in which the air conditioner performs a cooling/heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. Wherein the refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
An air conditioner according to some embodiments of the present application includes an air conditioner indoor unit installed in an indoor space. The indoor unit, i.e., the indoor unit, is connected to an outdoor unit, i.e., the outdoor unit, installed in an outdoor space through a pipe. The outdoor unit of the air conditioner may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expander, and the like for a refrigeration cycle, and the indoor unit of the air conditioner may be provided with an indoor heat exchanger and an indoor fan.
In some embodiments of the present invention, an air conditioner according to embodiments of the present invention may be described with reference to fig. 2 and 3. Fig. 2 is a block diagram of an air conditioner according to an embodiment of the present invention; fig. 3 is a schematic view of an air conditioner according to an embodiment of the present invention.
As shown in fig. 2, the air conditioner 10 includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a throttling device 4, an indoor fan 5, a first temperature sensor 6, a second temperature sensor 7, a four-way valve N, and a controller 8 (not shown in fig. 3), wherein the connection among the compressor 1, the indoor heat exchanger 2, the outdoor heat exchanger 3, the throttling device 4, the indoor fan 5, the first temperature sensor 6, the second temperature sensor 7, and the four-way valve N is not shown in fig. 2.
The throttling device 4 is used for realizing the refrigerant pressure adjusting function under the refrigerating working condition or the heating working condition of the air conditioner 10. When the air conditioner 10 operates under different working conditions, the flow direction of the refrigerant in the system pipeline can be changed through the four-way valve N, so that the interconversion between the refrigeration and the heating of the air conditioner 10 is realized.
In the heating condition, the indoor fan 5 is operated to blow air heated by the indoor heat exchanger 2 into the room, wherein the indoor fan 5 and the indoor heat exchanger 2 shown in fig. 2 and 3 are both disposed in the indoor unit, but the specific arrangement positions of the indoor fan 5 and the indoor heat exchanger 2 are not limited.
In the embodiment, as shown in fig. 3, the solid arrow indicates the flow direction of the refrigerant in the system pipeline of the air conditioner 10 under the cooling condition, and the flow direction of the refrigerant in the system pipeline is the compressor 1-the four-way valve N-the outdoor heat exchanger 3-the throttling device 4-the indoor heat exchanger 2-the compressor 1 under the cooling condition. For the air conditioner 10 that uses the refrigeration method to defrost, when the air conditioner 10 operates in the defrost mode, the flow direction of the refrigerant in the system pipeline is the same as the flow direction of the refrigerant in the refrigeration mode. The dashed arrow direction indicates the flow direction of the refrigerant in the system pipeline under the heating condition of the air conditioner 10. Under the heating working condition, the flow direction of a refrigerant in a system pipeline is compressor 1, four-way valve N, indoor heat exchanger 2, throttling device 4, outdoor heat exchanger 3 and compressor 1.
When the air conditioner 10 operates in the cooling operating condition and the heating operating condition, the circulation directions of the refrigerant gas in the air conditioner 10 are different, that is, when the air conditioner 10 operates in the defrosting mode and the heating mode, the circulation directions of the refrigerant gas in the air conditioner 10 are also different, and the switching between the heating mode and the defrosting mode of the air conditioner 10 is similar to the switching process between the cooling mode and the heating mode, and the switching of the modes can be realized by the four-way valve N arranged outdoors.
The first temperature sensor 6 is disposed on a coil of the indoor heat exchanger 2, for example, disposed inside the indoor heat exchanger 2 as shown in fig. 3, for collecting indoor heat of the indoor heat exchanger 2Temperature T of coil Inner disc . The second temperature sensor 7 is disposed on the coil of the outdoor heat exchanger 3, for example, disposed inside the outdoor heat exchanger 3 as shown in fig. 3, and is used for collecting the outdoor coil temperature T of the outdoor heat exchanger 3 Outer plate 。
The controller 8 is respectively connected with the compressor 1, the first temperature sensor 6 and the second temperature sensor 7, and is used for acquiring the operating frequency F of the compressor 1 and the indoor coil temperature T Inner disc And outdoor coil temperature T Outer plate . The controller 8 may be a Processor with data Processing and analyzing functions, such as a Central Processing Unit (CPU) in the air conditioner 10, and the like, and the controller 8 may include a monitoring Unit, a determining Unit, a control Unit, and the like for Processing and analyzing data.
In an embodiment, the controller 8 is configured to: when the air conditioner 10 is in heating operation, the operating frequency F of the compressor 1 of the air conditioner 10 is acquired.
In the embodiment, when the air conditioner 10 is just turned on, the system tends to be in a steady state after a certain period of time of the turn-on operation, and the operating frequency F of the compressor 1 is stabilized. Specifically, it may be set that the heating mode of the air conditioner 10 is detected to be started and the continuous operation time reaches the second preset time period, that is, the heating operation of the air conditioner 10 is determined. For a general air conditioner 10, the compressor 1 can approach a stable state after being started to operate for 10min, a second preset time period not shorter than 9min and not longer than 11min can be set, if the heating operation state of the air conditioner 10 is detected when the time period is shorter than 9min, the operation frequency of the compressor 1 is still unstable, and the judgment result can be influenced by the instability of the acquired data. If the heating operation state of the air conditioner 10 is detected after more than 11min, the waiting time is too long, and therefore, the second preset time period may be set to be 9min, 10min, 11min, or the like.
Wherein the operating frequency of the compressor 1 can be denoted by F. When the air conditioner 10 is operated in the heating mode, and in the process of actually using the air conditioner 10 by a user, when the indoor ambient temperature decreases or the user controls the air conditioner 10 to change from the mute/low-wind mode to the high-wind mode, or the user controls the air conditioner 10 to change from the sleep or mute mode to the normal heating mode, the operating frequency F of the compressor 1 suddenly rises, and the operating state of the compressor 1 can be monitored in real time by detecting the operating frequency F of the compressor 1.
In some embodiments of the present invention, it is determined that the increased value of the operating frequency F in the preset period exceeds the preset frequency threshold, and the air conditioner 10 is controlled to enter the false defrost mode.
It can be understood that the variation of the operating frequency F of the compressor may cause the fluctuation of the air conditioning system, and the short-time insufficient flow rate of the refrigerant may cause the pressure of the evaporating side to drop, thereby causing the temperature of the outdoor unit coil to drop suddenly.
Specifically, the description can be made in conjunction with fig. 4, as shown in fig. 4, which is a schematic diagram of the influence of the outdoor coil temperature on the operating frequency of the compressor according to an embodiment of the present invention, wherein the outdoor coil temperature is denoted as T Outer plate The line M in the figure represents the variation of the operating frequency F of the compressor over time; line N in the graph indicates the outdoor coil temperature as T Outer plate The change over time; line Q in the graph indicates the outdoor coil temperature T Outer plate Time dependent change in condition.
For example, as shown by the line N, the operation frequency F of the compressor suddenly increases and the outdoor unit coil temperature T starts at time T0 Outer plate Starting to descend and descending to the lowest level at the time T1, if the temperature T of the outdoor unit coil is at the moment Outer plate Has been reduced to meet the conditions for entering the defrost mode. But now the outdoor unit coil temperature T Outer plate The drop is caused by unstable operation of the compressor, and actually the outdoor heat exchanger may have no frost or very little frost, which may cause a slight drop of the indoor ambient temperature if the air conditioner is still operating in the defrosting mode. However, the intention of the user controlling the air conditioner to increase the air output or change the sleep or mute mode into the conventional heating mode is to increase the indoor environment temperature, the air conditioner enters the defrosting mode contrary to the desire of the user, the comfort experience of the user is reduced, and if the air conditioner frequently has the phenomenon of defrosting due to frost-free condition, the user experience is poor, and even the user complaints can be caused.
And, as indicated by the line N, inOutdoor unit coil temperature T after T3 Outer plate And the air conditioner returns to a stable state, and if the temperature after returning does not meet the condition that the air conditioner enters the defrosting mode, the air conditioner needs to exit the defrosting mode again and continue to operate the heating mode. In the process, the air conditioner runs in the defrosting mode for a short time, so that the corresponding defrosting effect cannot be achieved, and energy is additionally consumed.
Therefore, based on the above situation, the embodiment of the present invention provides a new defrosting control mode, and introduces a control parameter of a preset frequency threshold, where the preset frequency threshold is denoted by a, it can be understood that, when the air conditioner is in normal operation, the operating frequency F of the compressor may also slightly fluctuate due to various reasons, and if the preset frequency threshold a is set to a smaller value, the air conditioner may frequently enter a false defrosting mode, which may cause waste of control resources. Specifically, different preset frequency thresholds a can be set according to the configuration of the air conditioning system and according to the characteristics and configuration of the system. For example, the preset frequency threshold a may be set to be greater than or equal to 3Hz, for example, a may be 3Hz, 4Hz, 6Hz, 8Hz, or 10 Hz.
The operation frequency F of the compressor 1 is obtained at regular intervals while the air conditioner 10 is operating in the heating mode. Specifically, a time period for detecting the operating frequency F of the compressor 1, i.e., a preset period, may be set as needed, and the preset period is denoted by t. Because the duration of the sudden change of the operating frequency F of the compressor 1 is relatively short, and the time of the system in an unstable state is also relatively short, the preset period t for detecting the operating frequency F of the compressor 1 needs to be set to be not too long, so as to avoid the situation that the change of the operating frequency F of the compressor 1 cannot be detected in time. Different preset periods t can be set according to the configuration of the air conditioning system and the characteristics and configuration of the system, wherein t can be set to be more than or equal to 1s and less than or equal to 1min, and for example, the preset period can be 1s, 10s, 20s, 30s, 50s, 1min and the like. It can be understood that the variation of the operating frequency F of the compressor in a short time can be detected in real time by setting the preset period t to a small value.
When the operating frequency F of the compressor 1 suddenly rises, an increase in the operating frequency F of the compressor 1 is calculated. Specifically, the operation frequency of the compressor detected last time may be denoted as F (n-1), the operation frequency of the compressor detected this time may be denoted as F (n), and n is greater than or equal to 1, and then the increased value Δ F = F (n) -F (n-1) of the operation frequency of the compressor may be calculated. If the increased value delta F of the running frequency of the compressor meets the condition that delta F is larger than A within the preset period t, the running frequency F of the compressor is determined to be rapidly increased within a short time, and in order to prevent the air conditioner from entering the defrosting mode by mistake, the air conditioner can be controlled to enter a false defrosting mode firstly, and then whether the air conditioner needs to be controlled to run the defrosting mode is further determined.
In some embodiments of the present invention, an outdoor coil temperature and an indoor coil temperature are obtained from a time when the false defrost mode is entered, it is determined that the outdoor coil temperature at the (n + 1) th time is less than the outdoor coil temperature at the nth time, and the air conditioner is controlled to keep a heating operation so as not to perform the outdoor defrost, where n is a natural number.
For example, as shown by a line N in fig. 4, the operation frequency F of the compressor is suddenly increased and the outdoor unit coil temperature T is increased at the time point T0 Outer plate And starting to descend, and recording the time t0 as the time of entering the false defrosting mode.
Wherein, the indoor coil temperature is recorded as T Inner disc And the outdoor coil temperature at the (n + 1) th moment is recorded as T Outer plate (n + 1), and the outdoor coil temperature at the nth time is taken as T Outer plate (n)。
Specifically, when the operating frequency F of the compressor suddenly increases, the air conditioning system inevitably fluctuates, and the parameter representing the fluctuation of the air conditioning system is the indoor coil temperature T Inner disc Outdoor coil temperature T Outer plate Exhaust temperature, compressor operating frequency F and indoor wind speed, etc. The extent of the influence on the above parameters when the operating frequency F of the compressor suddenly changes can be described in conjunction with table 1. Wherein the ″) number represents a strong correlation, i.e., the greater the ″ "component number, the greater the degree of influence,
TABLE 1
Indoor coil temperature Outdoor coil temperature Exhaust temperature
Indoor wind speed ★★★★ ★ ★★★
Operating frequency of compressor ★★★★ ★★★★★ ★★★★★
As can be seen from Table 1, the sudden change in the operating frequency F of the compressor versus the indoor coil temperature T Inner disc And outdoor coil temperature T Outer plate Has a great influence on the indoor air speed to the indoor coil temperature T Inner disc Is greatly influenced, therefore, based on the indoor wind speed and the indoor coil temperature T Inner disc Outdoor coil temperature T Outer plate And the running frequency F of the compressor controls the conditions of defrosting and frequent defrosting of the air conditioner due to no frost, so that the user experience can be improved, and the energy consumption can be prevented.
As can be seen from the above table 1, when the operating frequency F of the compressor 11 is suddenly changed, the indoor coil temperature T is inevitably caused Inner disc And outdoor coil temperature T Outer plate If the temperature of the outdoor coil T is changed, the temperature T of the outdoor coil is inevitably generated when the air conditioner starts to enter the false defrosting mode Outer plate The condition of decrease, i.e. starting from the moment of first entering the false defrost mode, i.e. the moment T0, is checked for the outdoor coil temperature T Outer plate In the case of (2), T must be satisfied Outer plate (n+1)＜T Outer plate (n) in the formula (I). But now the outdoor coil temperature T Outer plate The rapid decrease is caused by the increase of the operating frequency F of the compressor 1, which causes the refrigerant supply shortage of the outdoor heat exchanger in a short time, and further causes the rapid decrease of the evaporating pressure, and when the temperature T of the outdoor coil pipe is higher Outer plate When the temperature is rapidly reduced, the temperature T of the indoor coil pipe is inevitably caused Inner disc Is raised or maintained so that the indoor coil temperature T Inner disc The state of the air conditioning system can be effectively represented to a certain degree. If the outdoor frosting condition is judged only through the temperature difference of the outdoor heat exchanger, when the running frequency F of the compressor 1 suddenly rises and within a subsequent period of time such as the time from T0 to T1, the outdoor heat exchange temperature difference is large and cannot reflect the real frosting condition of the outdoor heat exchanger, whether the outdoor heat exchanger really reaches the defrosting condition cannot be accurately judged, and if the defrosting condition is really judged according to the temperature T of the outdoor coil pipe at the moment Outer plate If the condition for controlling the air conditioner to enter the defrosting mode is lowered, a judgment error may be caused, and the air conditioner may still enter the defrosting mode by mistake. Referring to the line N in fig. 2, in the false defrost mode, even though T is detected Outer plate (n+1)＜T Outer plate (n) determining the outdoor coil temperature T Outer plate Decrease without judging the outdoor coil temperature T Outer plate Whether the condition of entering the defrosting mode is met or not is controlled, the air conditioner is controlled not to enter the defrosting mode at the moment and the heating mode is continuously operated, the condition that the indoor environment temperature is reduced due to mistaken entering of the defrosting mode can be effectively avoided, and the condition that the user experience is influenced is avoided.
Further, in an embodiment, it may be determined that the outdoor coil temperature T at the (n + 1) th time is satisfied for a preset number of consecutive times by the outdoor coil temperature Outer plate (n + 1) outdoor coil temperature T less than nth time Outer plate (n) condition in which there is a possibility that erroneous detection is caused when the number of detections is small, for exampleThe preset times can be more than or equal to 2 times, for example, the preset times can be 2 times, 3 times or 4 times, namely, the temperature T of the outdoor coil pipe is measured Outer plate Repeated detection and judgment are carried out, and the accuracy of the detection result and the judgment result can be ensured.
In some embodiments of the invention, when the outdoor coil temperature T Outer plate Keeping the temperature of the coil pipe in the chamber constant within a first preset time period and keeping the temperature of the coil pipe in the chamber constant within the first preset time period Outer plate And the indoor wind speed also remains unchanged, the air conditioner 10 is controlled to exit the false defrost mode.
Different first preset time lengths can be set according to the configuration of the air conditioning system and the characteristics and the configuration of the system, wherein the first preset time length is set to be less than or equal to 1min and less than or equal to 5min, for example, the first preset time length can be 1min, 2min, 3min, 4min, 5min and the like. Specifically, as shown by line Q in FIG. 4, after time T2, when the outdoor coil temperature T is sensed Outer plate Remains unchanged for a first preset duration, indicating an outdoor coil temperature T Outer plate Rises again after falling and has already stabilized and is at outdoor coil temperature T Outer plate Temperature T of indoor coil pipe in constant time period Inner disc And if the conditions are met, representing that the air conditioning system tends to be stable at the moment, controlling the air conditioner to exit the false defrosting mode and enter a conventional heating mode. If the above conditions can not be met completely, the representation shows that the air-conditioning system does not reach the stable state at the moment, and the air conditioner continues to control the temperature T of the outdoor coil pipe Outer plate Indoor coil temperature T Inner disc And periodically detecting the indoor wind speed, and keeping the current heating mode to operate. By detecting the temperature T of the indoor and outdoor coils in a preset period Outer plate Indoor coil temperature T Inner disc And the indoor wind speed is matched, and the outdoor coil temperature T is searched Outer plate At the lowest point of (d), then at outdoor coil temperature T Outer plate After rising, before stable operation, whether the defrosting condition is met or not is judged, and false defrosting can be effectively avoided.
According to the air conditioner 10 of the embodiment of the present invention, the operation frequency F of the compressor is detected in real time and determined to be within the rangeAnd when the increment value delta F of the operation frequency in the preset period exceeds a preset frequency threshold value A, controlling the air conditioner to enter a false defrosting mode. The first temperature sensor 6 and the second temperature sensor 7 are used for acquiring the indoor coil temperature T in real time Inner disc And outdoor coil temperature T Outer plate Which in turn may provide a data reference for the current operating strategy of the air conditioner 10. For outdoor coil temperature T caused by the variation of the operating frequency F of the compressor 1 Outer plate Indoor coil temperature T Inner disc Under the unsteady state of change, can effectively avoid the phenomenon of defrosting and frequent defrosting of no frost, control more accurately. And after the air conditioning system is determined to fluctuate and tend to be stable, the air conditioner 10 is controlled to exit the false defrosting mode in time to operate the conventional heating mode, so that extra energy consumption is avoided, the experience of a user is ensured, and the requirement of the user on the comfort level under the heating working condition is met.
In some embodiments of the invention, the controller 8 is further configured to: outdoor coil temperature T at determined time (n + 1) Outer plate (n + 1) outdoor coil temperature T less than nth time Outer plate (n) after that, further determining the outdoor coil temperature T Outer plate Rising after falling, outdoor coil temperature T Outer plate After rising to the first temperature, the temperature is kept constant, and the temperature T of the outdoor coil Outer plate And after the time length for keeping the first temperature unchanged reaches the first time length, the first temperature is reduced to a second temperature, the operating frequency F of the compressor 1 is increased to the first frequency and is not changed, and the air conditioner 10 is controlled to carry out outdoor defrosting, wherein the second temperature reaches the defrosting temperature.
At system unsteady state, outdoor coil temperature T Outer plate There may also be a lowering and then a re-raising. For example, as shown by a line Q in fig. 3, the operation frequency F of the compressor is suddenly increased and the outdoor unit coil temperature T is increased at the time T0 Outer plate Begins to fall and falls to the lowest at the moment T1, and after the moment T1, the temperature T of the outdoor coil pipe Outer plate Gradually rising and after T2, the temperature T of the coil of the outdoor unit Outer plate Will return to the second temperature and remain unchanged for a short time. Wherein, the values of the second temperature and the first time length can be set according to requirements, and are not carried outAnd (4) limiting.
Further, as shown by line Q in FIG. 4, if the operating frequency F of the compressor is not changed and the fluctuation of the air conditioning system is stabilized after a certain period of time, the outdoor coil temperature T is detected Outer plate When the condition for entering defrost mode is lowered and satisfied, e.g. outdoor coil temperature T as shown at time T3 Outer plate When the temperature is reduced to the second temperature and reaches the defrosting temperature, the condition of entering the defrosting mode is met, the condition indicates that the outdoor coil is frosted at the moment, the outdoor unit needs to be defrosted, and the air conditioner can normally execute defrosting operation at the moment. Therefore, the defrosting control method of the air conditioner in the embodiment of the invention only aims at the temperature T of the outdoor coil caused by the change of the operating frequency F of the compressor Outer plate The phenomenon such as frost-free and defrosting and frequent defrosting that appear under the unsteady state of change can not influence the defrosting operation of air conditioner when outdoor coil pipe really has the defrosting demand, and is more intelligent, can not influence user experience and feels.
A defrosting control method of an air conditioner according to an embodiment of the present invention will be described with reference to fig. 5 to 10. Note that the step numbers in the present application, such as S1, S2, S3, and S4, are only for convenience of describing the present embodiment, and are not to be construed as limiting the order of the steps. That is, for example, the execution sequence of steps S1, S2, S3, S4, etc. may be specifically determined according to actual requirements, and is not limited to the control in the sequence of steps in the following embodiments.
In some embodiments of the present invention, as shown in fig. 5, a flowchart of an air conditioner defrosting control method according to an embodiment of the present invention is provided, wherein the air conditioner defrosting control method at least includes steps S1-S4, which are described as follows.
S1, detecting the heating operation of the air conditioner, and acquiring the operating frequency of a compressor of the air conditioner.
In the embodiment, when the air conditioner is just started to operate, after the air conditioner is started to operate for a period of time, the system tends to be in a stable state, and the operating frequency of the compressor is stable. Specifically, the air conditioner heating operation may be determined by detecting that the air conditioner starts to operate in the heating mode and the continuous operation time reaches a second preset time period. For a general air conditioner, the compressor can tend to a stable state after being started and operated for 10min, a second preset time length is set to be less than or equal to 9min and less than or equal to 11min, if the heating operation state of the air conditioner is detected when the time length is less than 9min, the operation frequency of the compressor is still unstable, and the judgment result can be influenced by the instability of the acquired data. If the heating operation state of the air conditioner is detected after more than 11min, the waiting time is too long, and therefore, the second preset time period can be set to be 9min, 10min, 11min, and the like.
Wherein the operating frequency of the compressor can be denoted by F. When the air conditioner runs in a heating mode, in the process that a user actually uses the air conditioner, when the indoor environment temperature is reduced or the user controls the air conditioner to be changed from a mute mode and a low-wind mode to a high-wind mode, or the user controls the air conditioner to be changed from a sleep mode or a mute mode to a conventional heating mode, the running frequency F of the compressor can suddenly rise, and the running state of the compressor can be monitored in real time by detecting the running frequency F of the compressor.
And S2, determining that the increase value of the operating frequency in the preset period exceeds a preset frequency threshold value, and controlling the air conditioner to enter a false defrosting mode.
It can be understood that the variation of the operating frequency F of the compressor may cause the fluctuation of the air conditioning system, and the short-time insufficient supply of the refrigerant may cause the pressure drop of the evaporating side, thereby causing the temperature drop of the outdoor unit coil.
Specifically, it can be described with reference to fig. 4, wherein, as shown by a line N, the operation frequency F of the compressor is suddenly increased and the outdoor unit coil temperature T is increased at the time T0 Outer plate Begins to fall down and falls to the lowest at the moment T1, if the temperature T of the outdoor unit coil is reached Outer plate Has been reduced to meet the conditions for entering the defrost mode. But now the outdoor unit coil temperature T Outer plate The drop is caused by unstable operation of the compressor, and actually the outdoor heat exchanger may have no frost or very little frost, which may cause a slight drop of the indoor ambient temperature if the air conditioner is still operating in the defrosting mode. But the intention of the user controlling the air conditioner to increase the air output or changing from the sleep or mute mode to the conventional heating mode isPromote indoor ambient temperature, the air conditioner gets into the defrosting mode and contradicts with user's wish, reduces user's comfortable nature experience to if the air conditioner frequently appears not frostedly and the phenomenon of defrosting, cause user experience to feel poor, can arouse even that the user complains.
And, as shown by line N, the outdoor unit coil temperature T after time T3 Outer plate And the air conditioner returns to a stable state, and if the temperature after returning does not meet the condition that the air conditioner enters the defrosting mode, the air conditioner needs to exit the defrosting mode again and continue to operate the heating mode. In the process, the air conditioner runs in the defrosting mode for a short time, so that the corresponding defrosting effect cannot be achieved, and energy is additionally consumed.
Therefore, based on the above situation, the embodiment of the present invention provides a new defrosting control mode, and introduces a control parameter of a preset frequency threshold, where the preset frequency threshold is denoted by a, it can be understood that, when the air conditioner is in normal operation, the operating frequency F of the compressor may also slightly fluctuate due to various reasons, and if the preset frequency threshold a is set to a smaller value, the air conditioner may frequently enter a false defrosting mode, which may cause waste of control resources. Specifically, different preset frequency thresholds a can be set according to the configuration of the air conditioning system and according to the characteristics and configuration of the system. For example, the preset frequency threshold a may be set to be greater than or equal to 3Hz, for example, a may be 3Hz, 4Hz, 6Hz, 8Hz, or 10 Hz.
When the air conditioner operates in a heating mode, the operating frequency F of the compressor is acquired at regular intervals. Specifically, a time period for detecting the operating frequency F of the compressor, i.e., a preset period, may be set as needed, and the preset period is denoted by t. Because the duration of the sudden change of the operating frequency F of the compressor is short, and the time of the system in an unstable state is short, the preset period t for detecting the operating frequency F of the compressor needs to be set to be not too long, so that the change condition of the operating frequency F of the compressor cannot be detected in time. Different preset periods t can be set according to the configuration of the air conditioning system and the characteristics and the configuration of the system, wherein t is more than or equal to 1s and less than or equal to 1min, and the preset period can be 1s, 10s, 20s, 30s, 50s, 1min and the like. It can be understood that by setting the preset period t to a small value, the variation of the operating frequency F of the compressor in a short time can be detected in real time.
When the operating frequency F of the compressor suddenly rises, the operating frequency F of the compressor is increased by a frequency. Specifically, the operation frequency of the compressor detected last time may be denoted as F (n-1), the operation frequency of the compressor detected this time may be denoted as F (n), and n ≧ 1, the increased value Δ F = F (n) -F (n-1) of the operation frequency of the compressor may be calculated. If the increased value delta F of the running frequency of the compressor meets the condition that delta F is larger than A within the preset period t, the running frequency F of the compressor is determined to be rapidly increased within a short time, and in order to prevent the air conditioner from entering the defrosting mode by mistake, the air conditioner can be controlled to enter a false defrosting mode firstly, and then whether the air conditioner needs to be controlled to run the defrosting mode is further determined.
And S3, acquiring the temperature of the outdoor coil and the temperature of the indoor coil from the moment of entering the false defrosting mode, determining that the temperature of the outdoor coil at the (n + 1) th moment is less than the temperature of the outdoor coil at the nth moment, and controlling the air conditioner to keep heating operation so as not to defrost outdoors, wherein n is a natural number.
For example, as shown by a line N in fig. 4, the operation frequency F of the compressor is suddenly increased and the outdoor unit coil temperature T is increased at the time point T0 Outer plate And starting to descend, and recording the time t0 as the time of entering the false defrosting mode.
Wherein, the indoor coil temperature is recorded as T Inner disc And the outdoor coil temperature at the (n + 1) th moment is recorded as T Outer plate (n + 1), and recording the outdoor coil temperature at the nth time as T Outer plate (n)。
In particular, when the operating frequency F of the compressor suddenly increases, the air-conditioning system will necessarily fluctuate, and the parameter that characterizes the fluctuation of the air-conditioning system is the indoor coil temperature T Inner disc Outdoor coil temperature T Outer plate Exhaust temperature, compressor operating frequency F and indoor wind speed, etc. Wherein the operation of the compressor can be described in connection with Table 1The degree of influence on the above parameters when the line frequency F suddenly changes.
As can be seen from Table 1, the sudden change in the operating frequency F of the compressor versus the indoor coil temperature T Inner disc And outdoor coil temperature T Outer plate Has a great influence on the indoor air speed to the indoor coil temperature T Inner disc Is greatly influenced, therefore, based on the indoor wind speed and the indoor coil temperature T Inner disc Outdoor coil temperature T Outer plate And the running frequency F of the compressor controls the conditions of defrosting and frequent defrosting of the air conditioner due to no frost, so that the user experience can be improved, and the energy consumption can be prevented.
As can be seen from the above table 1, when the operating frequency F of the compressor is suddenly changed, the indoor coil temperature T is inevitably caused Inner disc And outdoor coil temperature T Outer plate When the change occurs, the outdoor coil temperature T will also occur when the air conditioner just starts to enter the false defrosting mode Outer plate In the case of a decrease, that is, from the time of the initial entering of the false defrost mode, that is, the time T0, the outdoor coil temperature T is checked Outer plate In the case of change, T must be satisfied Outer plate (n+1)＜T Outer plate (n) of (a). But now the outdoor coil temperature T Outer plate The rapid decrease is mainly caused by the increase of the running frequency F of the compressor, which causes the insufficient supply of the refrigerant in the outdoor heat exchanger in a short time, and further causes the rapid decrease of the evaporating pressure, and when the temperature T of the outdoor coil pipe is higher Outer plate When the temperature is rapidly reduced, the temperature T of the indoor coil pipe is inevitably caused Inner disc Is raised or maintained so that the indoor coil temperature T Inner disc The state of the air conditioning system can be effectively represented to a certain degree. If the outdoor frosting condition is judged only through the temperature difference of the outdoor heat exchanger, the outdoor heat exchange temperature difference is large and cannot reflect the real frosting condition of the outdoor heat exchanger within the sudden rise of the operating frequency F of the compressor and a subsequent period of time such as the time from T0 to T1, whether the frosting condition of the outdoor heat exchanger is really met cannot be accurately judged, and if the frosting condition is really met, the temperature T of the outdoor coil pipe is used Outer plate If the condition for controlling the air conditioner to enter the defrosting mode is lowered, a judgment error may be caused, and the air conditioner may still enter the defrosting mode by mistake. Ginseng radix (Panax ginseng C.A. Meyer)Referring to the line N in FIG. 2, in the false defrost mode, even if T is detected Outer plate (n+1)＜T Outer plate (n) determining the outdoor coil temperature T Outer plate Decrease without judging the outdoor coil temperature T Outer plate Whether the condition of entering the defrosting mode is met or not is controlled, the air conditioner is controlled not to enter the defrosting mode at the moment and the heating mode is continuously operated, the condition that the indoor environment temperature is reduced due to mistaken entering of the defrosting mode can be effectively avoided, and the condition that the user experience is influenced is avoided.
Further, in an embodiment, it may be determined that the outdoor coil temperature T at the (n + 1) th time is satisfied for a preset number of consecutive times by the outdoor coil temperature Outer plate (n + 1) outdoor coil temperature T less than nth time Outer plate (n), wherein the detection times are less likely to be misdetected, for example, the preset times can be more than or equal to 2 times, such as 2 times, 3 times, or 4 times, etc., that is, by comparing the outdoor coil temperature T Outer plate Repeated detection and judgment are carried out, and the accuracy of the detection result and the judgment result can be ensured.
And S4, when the temperature of the outdoor coil pipe is kept unchanged within the first preset time period and the temperature of the coil pipe in the indoor and the indoor wind speed are also kept unchanged within the first preset time period, controlling the air conditioner to exit the false defrosting mode.
Different first preset time lengths can be set according to the configuration of the air conditioning system and the characteristics and the configuration of the system, wherein the first preset time length is set to be less than or equal to 1min and less than or equal to 5min, for example, the first preset time length can be 1min, 2min, 3min, 4min, 5min and the like. Specifically, as shown by line Q in FIG. 2, after time T2, when the outdoor coil temperature T is sensed Outer plate Remains unchanged for a first preset duration, indicating an outdoor coil temperature T Outer plate Rises again after falling and has already stabilized and is at outdoor coil temperature T Outer plate Temperature T of indoor coil pipe in constant time period Inner disc And if the conditions are met, representing that the air conditioning system tends to be stable at the moment, controlling the air conditioner to exit the false defrosting mode and enter a conventional heating mode. If the above conditions are not all satisfied,then the representation shows that the air conditioning system has not reached a steady state at this moment, and the air conditioner continues to control the temperature T of the outdoor coil Outer plate Indoor coil temperature T Inner disc And periodically detecting the indoor wind speed, and keeping the current heating mode to operate. By detecting the temperature T of the indoor and outdoor coils in a preset period Outer plate Indoor coil temperature T Inner disc And the indoor wind speed is matched, and the outdoor coil temperature T is searched Outer plate At the lowest point of (d), then at outdoor coil temperature T Outer plate After rising, before stable operation, whether the defrosting condition is met or not is judged, and false defrosting can be effectively avoided.
According to the defrosting control method of the air conditioner, provided by the embodiment of the invention, a false defrosting mode is provided, and the temperature T of an outdoor coil pipe caused by the change of the operating frequency F of a compressor during the heating operation of the air conditioner Outer plate Indoor coil temperature T Inner disc And unsteady state of indoor wind speed change, i.e. outdoor coil temperature T Outer plate And the outdoor heat exchange temperature difference delta Tout meets the condition of entering a defrosting mode, and the air conditioner is not controlled to operate the defrosting mode. The method of the embodiment of the invention introduces a control parameter of a preset frequency threshold A, controls the air conditioner to enter a false defrosting mode when detecting that the increase value delta F of the running frequency F of the compressor in a preset period exceeds the preset frequency threshold A, and determines the temperature T of the outdoor coil pipe caused by system fluctuation Outer plate Indoor coil temperature T Inner disc After the change, the air conditioner is stabilized again and the indoor air speed is unchanged, the air conditioner is controlled to timely exit from the false defrosting mode and run the conventional heating mode, the phenomena of defrosting and frequent defrosting due to frostless can be effectively avoided, the air conditioner is more accurate, the extra energy consumption is avoided, the experience feeling of a user is guaranteed, and the requirement of the user on the comfort level under the heating working condition is met.
In some embodiments of the present invention, as shown in fig. 6, a flowchart of an air conditioner defrost control method according to another embodiment of the present invention is provided, wherein the air conditioner defrost control method further includes step S31.
S31, after the temperature of the outdoor coil at the (n + 1) th moment is determined to be smaller than the temperature of the outdoor coil at the nth moment, the temperature of the outdoor coil is further determined to rise after the temperature of the outdoor coil drops, the temperature of the outdoor coil keeps unchanged after the temperature of the outdoor coil rises to the first temperature, the temperature of the outdoor coil is reduced to the second temperature after the time length of the temperature of the outdoor coil keeping unchanged first temperature reaches the first time length, the operation frequency of the compressor is increased to the first frequency and is not changed, and the air conditioner is controlled to defrost outdoors, wherein the second temperature reaches the defrosting temperature.
At system unsteady state, outdoor coil temperature T Outer plate There may also be a lowering and then a re-raising. For example, as shown by a line Q in fig. 4, the operation frequency F of the compressor is suddenly increased and the outdoor unit coil temperature T is increased at the time T0 Outer plate Begins to fall and falls to the lowest at the moment T1, and after the moment T1, the temperature T of the outdoor coil pipe Outer plate Gradually rising and after T2, the temperature T of the coil of the outdoor unit Outer plate Will return to the second temperature and remain unchanged for a short time. The values of the second temperature and the first time period can be set according to needs, and are not limited herein.
Further, as shown by line Q in FIG. 4, if the operating frequency F of the compressor is not changed and the fluctuation of the air conditioning system is stabilized after a certain period of time, the outdoor coil temperature T is detected Outer plate When the condition for entering defrost mode is lowered and satisfied, e.g. outdoor coil temperature T as shown at time T3 Outer plate When the temperature is reduced to the second temperature and reaches the defrosting temperature, the condition of entering the defrosting mode is met, the condition indicates that the outdoor coil is frosted at the moment, the outdoor unit needs to be defrosted, and the air conditioner can normally execute defrosting operation at the moment. Therefore, the defrosting control method of the air conditioner in the embodiment of the invention only aims at the temperature T of the outdoor coil caused by the change of the operating frequency F of the compressor Outer plate The phenomenon such as frost-free and defrosting and frequent defrosting that appear under the unsteady state of change can not influence the defrosting operation of air conditioner when outdoor coil pipe really has the defrosting demand, and is more intelligent, can not influence user experience and feels.
In some embodiments of the present invention, as shown in fig. 7, a flowchart of an air conditioner defrosting control method according to another embodiment of the present invention is provided, wherein after detecting a heating operation of an air conditioner, the air conditioner defrosting control method further includes at least one of step S11 and step S12, as follows.
S11, detecting that the indoor temperature is reduced and the temperature difference between the indoor temperature and the set temperature is increased.
For example, when a user uses an air conditioner to perform heating operation for a period of time, the indoor temperature gradually rises, and the set temperature difference becomes smaller and smaller, wherein the set temperature difference = the room temperature-the set temperature, and the smaller the set temperature difference, which indicates that the room temperature is closer to the set temperature, the air conditioner is slowly subjected to frequency reduction from the initial high-frequency operation to the medium-low frequency operation, and when the user set temperature requirement is met, the medium-low frequency operation is maintained. During the period that the air conditioner keeps operating at the medium-low frequency, the indoor temperature is reduced due to frequent door opening and closing or personnel change, the set temperature difference is increased, and the air conditioner can be operated at an increased frequency again. When the operating frequency F of the compressor of the air conditioner suddenly increases, the outdoor coil temperature T Outer plate Can be rapidly reduced and is lower than the outdoor coil temperature T during high-frequency stable operation Outer plate . At this time, if the temperature difference and the operation time of the conventional outdoor heat exchange are adopted, the temperature T of the outdoor coil pipe can be judged Outer plate If the defrosting operation is performed at this time, the indoor temperature is reduced, and the comfort experience of the user is affected.
And S12, detecting that the wind speed of the indoor fan is increased.
For example, when the air conditioner operates in a heating working condition and operates in a mute or sleep mode, the compressor is in low-frequency operation, the fan operates in low wind speed, if the indoor temperature requirement is not met after the air conditioner operates in the operation mode for a period of time, if a user feels cold, the air conditioner is controlled to be adjusted to be in conventional heating operation, at the moment, the wind speed of the fan is changed from low wind to high wind, and the operation frequency F of the compressor is also increased rapidly.
For another example, when a user starts up and operates for a period of time by using high wind or strong wind, the temperature of the indoor coil pipe rises, the power of the air conditioner increases, and at this time, current protection or inner disc overload protection may be triggered to cause a frequency reduction phenomenon, the air conditioner is further changed into a low wind mode, the compressor keeps operating at a low frequency, the air conditioning system keeps operating at a low frequency, and at this time, the evaporation temperature is high, frosting is not easily generated, and the frost amount of the outdoor unit is generally little or none. After the compressor keeps operating at the low frequency for a period of time, if the user changes the wind speed to high wind or strong wind again, the protection mode is released, and at the moment, the operating frequency F of the compressor can be rapidly increased.
Synthesize above information, the difference in temperature increase of indoor temperature reduction and indoor temperature and settlement temperature to and the wind speed increase of indoor fan, all can lead to the operating frequency F of compressor to rise fast, and the operating frequency F of compressor changes and has leaded to air conditioning system's fluctuation, and when the operating frequency F of compressor risees, refrigerant supply is not enough in the outdoor heat exchanger short time, can lead to evaporating pressure to reduce fast, and then leads to outdoor coil pipe temperature T Outer plate Rapidly lowered so that the defrosting condition may be satisfied. And the fluctuation of the air conditioning system caused by the change of the running frequency F of the compressor can be finally stabilized after a certain time, so that the actual frosting condition of the outdoor heat exchanger cannot be reflected due to large outdoor heat exchange temperature difference in the sudden rise of the running frequency F of the compressor and a subsequent period of time, and further whether the defrosting condition is really met cannot be accurately judged. If the outdoor frosting condition is judged only through the outdoor heat exchange temperature difference, the phenomena of false defrosting and frequent defrosting of the air conditioner can be caused, the comfortable experience of a user is reduced, and the energy consumption is additionally increased.
Thus, a specific flow of the air conditioner defrosting control method according to the embodiment of the present invention can be described with reference to fig. 8 and 9, and as shown in fig. 8, a flow chart of the air conditioner defrosting control method according to another embodiment of the present invention is shown, wherein the air conditioner defrosting control method includes steps S101-S104, which are described as follows.
And S101, operating a heating mode by the air conditioner.
S102, detecting that the compressor is continuously started to operate for a second preset time, and acquiring the operating frequency of the compressor. Wherein the second operation time period can be 10min.
S103, detecting that the running frequency F of the compressor is increased, judging whether the running frequency F meets the requirement that deltaF is larger than A, if the judgment result is yes, executing a step S104, and entering a false defrosting mode; if the determination result is "no", the process returns to step S101, and the current heating mode is maintained. Wherein A is a preset frequency threshold value, and can be set to be more than or equal to 3Hz.
In some embodiments of the present invention, as shown in fig. 9, a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention is provided, wherein the defrosting control method of an air conditioner further includes steps S105 to S112, which are described as follows.
And S105, operating the air conditioner in a false defrosting mode.
S106, judging whether more than two consecutive values meet T Outer plate (n+1)＜T Outer plate (n), if the judgment result is yes, step S107 is executed, and if the judgment result is no, the defrosting mode is not entered, and step S111 is executed to keep the heating mode operation.
S107, continuously detecting T Outer plate 、T Inner disc And indoor wind speed, and judging whether T is satisfied Outer plate 、T Inner disc And the indoor wind speed is kept unchanged within a first preset time, and if the judgment result is yes, the temperature T of the outdoor coil pipe is represented Outer plate Stabilizing after descending and the system, executing step S110, if the judgment result is "No", it indicates that the system has not reached the stable state, continuing to perform the calibration on T Outer plate 、T Inner disc And indoor wind speed. Wherein, the first preset time period can be set to be 5min.
S110, continuously judging whether T in three continuous periods is met Outer plate (n+1)＜T Outer plate (n), if the judgment structure is "yes", executing step S107, if the judgment result is "no", indicating the outdoor coil temperature T Outer plate If the temperature does not decrease, step S108 is executed to exit the false defrost mode, and step S109 is executed to enter the normal heating mode.
According to the defrosting control method of the air conditioner provided by the embodiment of the invention, the defrosting control method can be used for controlling the temperature of outdoor environment and the temperature T of outdoor coil pipe Outer plate Indoor coil temperature T Inner disc Exhaust temperature and chamberOn the basis of taking the internal wind speed and the like as parameters for controlling the defrosting mode, the running frequency F of the compressor and the temperature T of the outdoor coil pipe are introduced Outer plate Indoor coil temperature T Inner disc And the indoor wind speed is controlled according to the conditions of defrosting and frequent defrosting when the running frequency F of the compressor is in an unsteady state, so that the control is more accurate, the extra energy consumption is avoided, and the comfortable experience of a user is improved.
In some embodiments of the present invention, an air conditioner 10 adopting the method of the above embodiment is also provided, as shown in fig. 10, which is a block diagram of an air conditioner according to an embodiment of the present invention, wherein the air conditioner 10 includes at least one processor 101 and a memory 102.
The memory 102 is connected to the at least one processor 101 in a communication manner, a computer program executable by the at least one processor 101 is stored in the memory 102, and the at least one processor 101 executes the computer program to implement the air conditioner defrosting control method according to any one of the above aspects.
According to the air conditioner 10 provided by the embodiment of the present invention, when the at least one processor 101 executes the computer program stored in the memory 102, the air conditioner defrosting control method according to the above embodiment is implemented, by using the method, the phenomena of defrosting and frequent defrosting due to frost-free of the air conditioner 10 can be effectively avoided, the control is more accurate, the additional energy consumption is avoided, the user experience is ensured, and the requirement of the user on the comfort level under the heating condition is met.
And, the air conditioner defrosting control method of the above embodiment is applied to the air conditioner 10, without increasing hardware cost, and can more effectively control the conditions of defrosting and frequent defrosting which are easily caused by frost under the unsteady state of the air conditioning system, thereby avoiding additional energy consumption, and having important significance for the intelligent development of the air conditioner 10.
Other configurations and operations of the air conditioner 10 and the like according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An air conditioner, comprising:
the system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a throttling device and an indoor fan;
the first temperature sensor is used for collecting the temperature of an indoor coil of the indoor heat exchanger;
the second temperature sensor is used for acquiring the temperature of an outdoor coil of the outdoor heat exchanger;
a controller connected to the compressor, the first temperature sensor, and the second temperature sensor, respectively, the controller configured to:
when the air conditioner is in heating operation, acquiring the operating frequency of a compressor of the air conditioner, determining that the increase value of the operating frequency in a preset period exceeds a preset frequency threshold value, and controlling the air conditioner to enter a false defrosting mode;
starting from the moment of entering the false defrosting mode, acquiring the temperature of the outdoor coil and the temperature of the indoor coil, determining that the temperature of the outdoor coil at the (n + 1) th moment is less than the temperature of the outdoor coil at the nth moment, and controlling the air conditioner to keep heating operation so as not to defrost outdoors, wherein n is a natural number;
and when the temperature of the outdoor coil pipe is kept unchanged within a first preset time period and the temperature of the indoor coil pipe and the indoor wind speed are also kept unchanged within the first preset time period, controlling the air conditioner to exit the false defrosting mode.
2. The air conditioner of claim 1, wherein the controller is configured to: when the outdoor coil temperature at the (n + 1) th moment is determined to be lower than the outdoor coil temperature at the nth moment, the frequency that the outdoor coil temperature at the (n + 1) th moment is lower than the outdoor coil temperature at the nth moment is determined to reach a preset frequency, wherein the preset frequency is more than or equal to 2 times.
3. The air conditioner of claim 1, wherein the controller is configured to: and detecting that the air conditioner starts a heating mode and the continuous operation time reaches a second preset time, wherein the second preset time is less than or equal to 11min and is less than or equal to 9 min.
4. The air conditioner of claim 1, wherein the controller is further configured to: after determining that the outdoor coil temperature at the (n + 1) th moment is less than the outdoor coil temperature at the nth moment, further determining that the outdoor coil temperature rises again after falling, the outdoor coil temperature remains unchanged after rising to the first temperature, the outdoor coil temperature decreases again to a second temperature after the duration of the first temperature being unchanged reaches the first duration, and the operating frequency of the compressor increases until the first frequency is unchanged, and controlling the air conditioner to perform outdoor defrosting, wherein the second temperature reaches the defrosting temperature.
5. The air conditioner as claimed in claim 1, wherein the preset period is 1s or less and 1min or less, the preset frequency threshold is 3Hz or more, and 1min or less and the first preset duration is 5min or less.
6. An air conditioner defrosting control method is characterized by comprising the following steps:
detecting the heating operation of the air conditioner, and acquiring the operating frequency of a compressor of the air conditioner;
determining that the increase value of the operating frequency exceeds a preset frequency threshold value in a preset period, and controlling the air conditioner to enter a false defrosting mode;
the method comprises the steps of obtaining the temperature of an outdoor coil and the temperature of an indoor coil from the moment of entering a false defrosting mode, determining that the temperature of the outdoor coil at the (n + 1) th moment is smaller than the temperature of the outdoor coil at the nth moment, and controlling the air conditioner to keep heating operation so as not to defrost outdoors, wherein n is a natural number;
and when the temperature of the outdoor coil pipe is kept unchanged within a first preset time period and the temperature of the indoor coil pipe and the indoor wind speed are also kept unchanged within the first preset time period, controlling the air conditioner to exit the false defrosting mode.
7. The air conditioner defrost control method of claim 6, wherein determining that the outdoor coil temperature at time (n + 1) is less than the outdoor coil temperature at time n comprises:
and determining that the continuous preset times of the outdoor coil temperature meet the condition that the outdoor coil temperature at the (n + 1) th moment is less than the outdoor coil temperature at the nth moment, wherein the preset times are more than or equal to 2.
8. The defrosting control method of an air conditioner according to claim 6, wherein the preset period is less than or equal to 1s and less than or equal to 1min, the preset frequency threshold is greater than or equal to 3Hz, and 1min and less than or equal to the first preset time period and less than or equal to 5min.
9. The air conditioner defrost control method of claim 6, further comprising:
after determining that the outdoor coil temperature at the (n + 1) th time is less than the outdoor coil temperature at the nth time, further determining that the outdoor coil temperature rises again after falling, the outdoor coil temperature remains unchanged after rising to the first temperature, the outdoor coil temperature decreases to a second temperature again after the outdoor coil temperature remains unchanged at the first temperature for the first time, and the operating frequency of the compressor increases to the first frequency and is unchanged, and controlling the air conditioner to defrost outdoors, wherein the second temperature reaches a defrosting temperature.
10. The air conditioner defrosting control method according to any one of claims 6 to 8, wherein detecting the air conditioner heating operation includes:
and detecting that the air conditioner starts a heating mode and the continuous operation time reaches a second preset time, wherein the second preset time is less than or equal to 11min and is less than or equal to 9 min.
CN202210760704.3A 2022-06-30 2022-06-30 Air conditioner and defrosting control method thereof Active CN115183400B (en)

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