CN115183401A - Air conditioner and defrosting control method thereof - Google Patents

Air conditioner and defrosting control method thereof Download PDF

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Publication number
CN115183401A
CN115183401A CN202210760711.3A CN202210760711A CN115183401A CN 115183401 A CN115183401 A CN 115183401A CN 202210760711 A CN202210760711 A CN 202210760711A CN 115183401 A CN115183401 A CN 115183401A
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China
Prior art keywords
temperature
outdoor coil
air conditioner
outdoor
moment
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CN202210760711.3A
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Chinese (zh)
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CN115183401B (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 CN202210760711.3A priority Critical patent/CN115183401B/en
Publication of CN115183401A publication Critical patent/CN115183401A/en
Priority to PCT/CN2023/086271 priority patent/WO2024001386A1/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

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

Abstract

The invention discloses an air conditioner and a defrosting control method thereof, wherein the air conditioner comprises a compressor, an outdoor heat exchanger, a temperature sensor and a controller, wherein the temperature sensor is used for detecting the temperature of an outdoor coil; the controller is configured to: when the air conditioner is in heating operation, acquiring the operating frequency of the compressor, 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; in a false defrosting mode, acquiring the temperature of an outdoor 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, controlling the air conditioner to keep heating operation so as not to defrost outdoors, limiting that the outdoor environment temperature does not meet the condition of entering a conventional defrosting mode, further continuously determining that the temperature of the outdoor coil at the (m + 1) th moment is not less than the temperature of the outdoor coil at the mth moment for a first preset time, and controlling the air conditioner to continuously keep heating operation, wherein m and n are natural numbers, and the first preset time is not less than or equal to 2 times.

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 is operated for a certain 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 conventional 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 conventional defrosting mode. However, when the outdoor heat exchanger is frostless or frosty, the heating capacity is very strong, and the defrosting mode is performed, the room temperature is greatly fluctuated, the comfort of the user is reduced, and the 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, 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: a compressor and an outdoor heat exchanger; the temperature sensor is arranged on the outdoor heat exchanger and used for detecting the temperature of the outdoor coil; a controller connected with the compressor and the temperature sensor, the controller configured to: when the air conditioner is in heating operation, acquiring the operating frequency of the compressor, determining that the increasing 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; in the false defrosting mode, the temperature of the outdoor coil is 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 n th moment, the air conditioner is controlled to keep heating operation so as not to carry out outdoor defrosting, the outdoor environment temperature is limited not to meet the condition of entering the conventional defrosting mode, the temperature of the outdoor coil at the (m + 1) th moment is further determined to be not lower than the temperature of the outdoor coil at the m th moment continuously for a first preset time, the air conditioner is controlled to keep heating operation continuously, wherein m and n are natural numbers, and the first preset time is not less than 2 times.
According to the air conditioner provided by the embodiment of the invention, the false defrosting mode is provided, and the air conditioner is controlled to enter the false defrosting mode by detecting the operating frequency of the compressor and determining that the increased value of the operating frequency of the compressor in a preset period exceeds a preset frequency threshold value. The temperature sensor is used for acquiring the temperature of the outdoor coil, and further data reference can be provided for the current operation strategy of the air conditioner. The phenomenon of defrosting due to frost and frequent defrosting can be effectively avoided under the unsteady state that the temperature of the outdoor coil changes due to the change of the operating frequency of the compressor, and the control is more accurate. And when the temperature of the outdoor coil pipe is determined to start rising or be about to tend to be stable in the unstable state of the system, the air conditioner is controlled to continuously keep heating operation, the control on the exit condition of the false defrosting mode is more accurate, and the user experience is improved.
In some embodiments of the invention, in the false defrost mode, the controller is further configured to: recording the operation frequency of the compressor at the moment when the outdoor coil temperature at the (m + 1) th moment is determined to be not lower than the outdoor coil temperature at the mth moment for a first preset number of times, starting from the moment when the outdoor coil temperature at the (m + 1) th moment is determined to be not lower than the outdoor coil temperature at the mth moment for the first preset number of times, further determining that the outdoor coil temperature is kept unchanged or determining that the outdoor coil temperature at the (i + 1) th moment is lower than the outdoor coil temperature at the ith moment and the operation frequency of the compressor is not higher than the first frequency, controlling the air conditioner to exit the false defrosting mode, continuing heating operation and canceling limitation on the outdoor environment temperature, wherein the second preset number is not lower than 2 times, and i is larger than m.
According to the air conditioner disclosed by the embodiment of the invention, the temperature of the outdoor coil and the running frequency of the compressor are detected, and after the fluctuation and the stability of the air conditioning system are determined, the air conditioner is controlled to exit the false defrosting mode and run the conventional heating mode in time, so that the additional 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 present invention, the controller is further configured to, when determining that the outdoor coil temperature at the (i + 1) th time is less than the outdoor coil temperature at the i-th time, continuously determine that the outdoor coil temperature satisfies that the outdoor coil temperature at the (i + 1) th time is less than the outdoor coil temperature at the i-th time for a second preset number of times, wherein the second preset number of times is greater than or equal to 2 times.
In some embodiments of the invention, the controller is further configured to: 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, the outdoor coil temperature remains unchanged after reaching the first temperature, the outdoor coil temperature decreases again to a second temperature after the outdoor coil temperature remains unchanged at the first temperature for the first time, and the operating frequency of the compressor increases until the second frequency is unchanged, controlling the air conditioner to defrost outdoors, and canceling the limitation on the outdoor environment temperature, wherein the second temperature reaches the defrosting temperature.
In some embodiments of the present invention, the controller is further configured to detect that the air conditioner starts the operation heating mode and the continuous operation time reaches a first preset time period to determine the air conditioner heating operation, wherein 10min is less than or equal to the first preset time period.
In order to achieve the above object, a defrosting control method for an air conditioner according to a second aspect of the present invention includes: detecting the heating operation of the air conditioner, and acquiring the operating frequency of the compressor; 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; acquiring the outdoor coil temperature from the moment of entering the false defrosting mode, determining that the outdoor coil temperature at the (n + 1) th moment is less than the outdoor coil temperature at the nth moment, controlling the air conditioner to keep heating operation so as not to defrost outdoors, and limiting that the outdoor environment temperature does not meet the condition of entering the conventional defrosting mode, wherein n is a natural number; and further continuously determining the outdoor coil temperature meeting the requirement that the outdoor coil temperature at the (m + 1) th moment is not lower than the outdoor coil temperature at the mth moment for a first preset time, and controlling the air conditioner to continuously keep heating operation, wherein m is a natural number, and the first preset time is more than or equal to 2 times.
According to the defrosting control method of the air conditioner, which is provided by the embodiment of the invention, a false defrosting mode is provided, and the air conditioner is controlled to enter the false defrosting mode by detecting the operating frequency of the compressor and determining that the increasing value of the operating frequency of the compressor in a preset period exceeds a preset frequency threshold value. And by acquiring the temperature of the outdoor coil, a data reference can be provided for the current operation strategy of the air conditioner. The phenomenon of defrosting due to frost and frequent defrosting can be effectively avoided under the unsteady state that the temperature of the outdoor coil changes due to the change of the operating frequency of the compressor, and the control is more accurate. And when the temperature of the outdoor coil pipe is determined to start rising or be about to tend to be stable in the unstable state of the system, the air conditioner is controlled to continuously keep heating operation, the control on the exit condition of the false defrosting mode is more accurate, and the user experience is improved.
In some embodiments of the present invention, after further determining in succession for a first preset number of times that the outdoor coil temperature satisfies that the outdoor coil temperature at time (m + 1) is not lower than the outdoor coil temperature at time m, the control method further comprises: recording the running frequency of the compressor at the moment when the outdoor coil temperature at the (m + 1) th moment is determined to be not lower than the outdoor coil temperature at the mth moment as a first frequency for a first preset number of times; starting from the moment that the outdoor coil temperature at the (m + 1) th moment is determined to be not lower than the outdoor coil temperature at the mth moment for a first preset time, further determining that the outdoor coil temperature is kept unchanged or determining that the outdoor coil temperature at the (i + 1) th moment is lower than the outdoor coil temperature at the ith moment and the running frequency of the compressor is not higher than the first frequency, wherein i is larger than m, and the second preset time is larger than or equal to 2 times; and controlling the air conditioner to exit the false defrosting mode, continuing heating operation and canceling limitation on the outdoor environment temperature.
According to the defrosting control method of the air conditioner, disclosed by the embodiment of the invention, the temperature of the outdoor coil and the running frequency of the compressor are detected, and after the fluctuation and the stability of the air conditioning system are determined, the air conditioner is timely controlled to exit the false defrosting mode and run the conventional heating mode, so that the 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 present invention, determining that the outdoor coil temperature at time (i + 1) is less than the outdoor coil temperature at time i comprises: and continuously determining the outdoor coil temperature for a second preset time, wherein the outdoor coil temperature at the (i + 1) th moment is less than the outdoor coil temperature at the i th moment, and the second preset time is more than or equal to 2 times.
In some embodiments of the invention the method further comprises: 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, the outdoor coil temperature remains unchanged after reaching the first temperature, the outdoor coil temperature is reduced to a second temperature again after reaching the first time length and the operation frequency of the compressor is increased to a second frequency and is unchanged, controlling the air conditioner to perform outdoor defrosting, and canceling the limitation on the outdoor environment temperature, 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 first preset time, wherein the first preset time is less than or equal to 10min.
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 the outdoor unit coil temperature affected by the operating frequency of the compressor according to one embodiment of the present invention;
fig. 4 is a flowchart of a defrosting control method of an air conditioner according to an embodiment of the present invention;
fig. 5 is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention;
fig. 6 is a flowchart of a defrosting control method of an air conditioner according to still 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.
Reference numerals:
an air conditioner 10;
compressor 1, outdoor heat exchanger 2, temperature sensor 3, controller 4.
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 without changing the heating cycle of the unit, and the defrosting purpose is achieved by utilizing the heat discharged 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 accumulation, reverse cycle defrosting and bypass defrosting all have the not enough problem of heat source, and the heat accumulation defrosting is under the heating mode, gets up partial heat storage, is giving out the heat when needing the defrosting, often adopts the mode of parcel compressor to carry 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, does not generally apply at present.
The existing air conditioner generally adopts a refrigeration mode (reverse cycle) defrosting, and in order to ensure that the heating efficiency of the indoor environment is not influenced, the outdoor unit is required to be timely and effectively defrosted, 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, under 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 temperature difference Δ Tout of the outdoor heat exchange is suddenly increased to meet the defrosting condition, and then defrosting is carried out. However, since there is no frost or very thin frost on the outdoor heat exchanger, the heating capacity is very strong, and performing the defrosting mode causes a large fluctuation in the room temperature, reduces the user comfort, and additionally consumes energy.
Based on the above, in order to solve the problem that the operating frequency of the compressor suddenly increases to cause the temperature of the outdoor coil to rapidly decrease, 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 to defrost, 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 described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all 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 cooling 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 system 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 system circulation, and the indoor unit of the air conditioner may be provided with an indoor heat exchanger and an indoor fan.
An air conditioner according to an embodiment of the present invention will be described below with reference to fig. 2 and 3.
As shown in fig. 2, which is a block diagram of an air conditioner according to an embodiment of the present invention, wherein the air conditioner 10 includes a compressor 1, an outdoor heat exchanger 2, a temperature sensor 3, and a controller 4. Wherein, the temperature sensor 3 is arranged on the outdoor heat exchanger 2 and used for detecting the temperature of the outdoor coil.
The controller 4 is connected to the compressor 1 and the temperature sensor 3, the controller 4 may be a Processor having data Processing and analyzing functions, such as a Central Processing Unit (CPU) in an air conditioner, and the like, and the controller 4 may include a monitoring Unit, a determining Unit, a control Unit, and the like for Processing and analyzing data.
The controller 4 is configured to acquire the operating frequency of the compressor 1 when the air conditioner 10 is in heating operation.
In some embodiments of the present invention, the controller 4 is further configured to detect that the air conditioner 10 starts the operation heating mode and determine that the air conditioner 10 is in heating operation when the continuous operation time reaches a first preset time period, wherein 10min ≦ the first preset time period.
For a general air conditioner 10, after the compressor 1 is started and operated for 10min, the operation frequency is gradually stabilized, the system tends to a stable state, the compressor 1 can be set to be started and continuously operated for more than or equal to 10min, the time duration of 10min is set to be less than or equal to a first preset time duration, if the heating operation state of the air conditioner 10 is detected when the time duration of 10min is less than, the operation frequency of the compressor 1 is still unstable, and the acquired data is unstable and may influence the judgment result.
In the embodiment, after the air conditioner 10 is started to operate for a certain period of time, the system tends to a steady state, and the operating frequency of the compressor 1 is stable. The operation frequency of the compressor 1 may be represented by F, and when the air conditioner 10 operates in the heating mode, in a process that a user actually uses the air conditioner 10, when an indoor environment temperature decreases, or the user controls the air conditioner to change from a mute mode to a low-wind mode, or the user controls the air conditioner 10 to change from a sleep mode or a mute mode to a normal heating mode, the operation frequency F of the compressor 1 may increase.
In some embodiments of the present invention, it is determined that the increased value of the operating frequency 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 1 causes the fluctuation of the air conditioning system, and the short-time shortage of the refrigerant flow rate causes the pressure of the evaporating side to drop, which in turn causes the temperature of the outdoor coil to drop suddenly.
Specifically, the description can be made in conjunction with fig. 3, as shown in fig. 3, which is a schematic diagram of the effect 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 1 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 1 suddenly increases and the outdoor coil temperature T starts at time T0 Outer plate Begins to fall and falls to the minimum at time t1 if this occursTime-out outdoor coil temperature T Outer plate Has been reduced to meet the condition for entering the normal defrost mode. But now the outdoor coil temperature T Outer plate The drop is caused by the unstable operation of the compressor 1, and in fact the outdoor heat exchanger 2 may be frostless or have a very small amount of frost, which may result in a slight drop in the indoor ambient temperature if the air conditioner 10 is still operating in the conventional defrost mode. However, the intention of the user to control the air conditioner 10 to increase the air output or change the sleep or mute mode into the normal heating mode is to increase the indoor ambient temperature, the air conditioner 10 enters the normal defrosting mode contrary to the user's will, so that the user comfort experience is reduced, and if the air conditioner 10 frequently has the phenomenon of defrosting due to frost-free condition, the user experience is poor, and even the user complaints are caused.
And, as shown by line N, the outdoor coil temperature T after time T3 Outer plate The temperature will return to the steady state, and if the temperature after the return does not satisfy the condition that the air conditioner 10 enters the normal defrosting mode, the air conditioner 10 needs to exit the defrosting mode again and continue to operate the heating mode. In this process, the air conditioner 10 briefly operates in the conventional defrosting mode, which not only fails to achieve the corresponding defrosting effect, but also consumes additional energy.
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 10 is in normal operation, the operating frequency F of the compressor 1 may slightly fluctuate due to various reasons, and if the preset frequency threshold a is set to a smaller value, the air conditioner 10 may frequently enter the 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 value of a may be 3Hz, 4Hz, 6Hz, 8Hz, or 10 Hz.
The operation frequency F of the compressor is obtained once at regular intervals when the air conditioner 10 is operated 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 time duration of the sudden change of the operating frequency F of the compressor 1 is relatively short, and the time for the system to be 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 that the change condition 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 will be appreciated that by setting the preset period t to a small value, it is possible to detect a variation in the operating frequency F of the compressor for a short time.
Further, when a sudden increase in the operating frequency F of the compressor 1 is detected, an increase in the operating frequency F of the compressor 1 is calculated. Specifically, if the operation frequency of the compressor 1 detected last time is denoted as F (n-1), the operation frequency of the compressor 1 detected this time is denoted as F (n), and n is greater than or equal to 1, the increased value Δ F = F (n) -F (n-1) of the operation frequency of the compressor 1 can be calculated. If the increased value deltaF of the operating frequency of the compressor 1 meets the condition that deltaF is larger than A within the preset period t, the operating frequency F of the compressor 1 is determined to be rapidly increased within a short time, and in order to prevent the air conditioner 10 from entering the conventional defrosting mode by mistake, at this time, the air conditioner 10 can be controlled to enter the false defrosting mode first, and then whether the air conditioner 10 needs to be controlled to operate the conventional defrosting mode is further determined.
In other embodiments, in the false defrost mode, the outdoor coil temperature T is taken Outer plate Determining that the outdoor coil temperature at the (n + 1) th time is less than the outdoor coil temperature at the nth time, controlling the air conditioner 10 to maintain the heating operation so as not to perform the outdoor defrosting, and defining that the outdoor ambient temperature does not satisfy the condition for entering the conventional defrosting mode, where n is a natural number.
Wherein, the outdoor coil temperature at the (n + 1) th time is denoted as T Outer plate (n + 1), and the outdoor coil temperature at the nth time is recorded as T Outer plate (n)。
Specifically, when the operating frequency F of the compressor 1 suddenly increases, the air conditioning system inevitably fluctuates, and the parameters representing the fluctuation of the air conditioning system include the indoor coil temperature and the outdoor coil temperature T Outer plate Exhaust temperature, operating frequency F of the compressor 1, indoor wind speed, and the like. The extent of the influence on the above parameters when the operating frequency F of the compressor 1 suddenly changes can be described in conjunction with table 1. Wherein the ″) number represents a strong correlation, i.e., the greater the ″ "number, the greater the degree of impact.
TABLE 1
Indoor coil temperature Outdoor coil temperature Exhaust gas temperature
Indoor wind speed ★★★★ ★ ★★★
Operating frequency of compressor ★★★★ ★★★★★ ★★★★★
As can be seen from table 1, a sudden change in the operating frequency F of the compressor 1 versus the outdoor coil temperature T Outer plate Is very much affected, and is therefore based on a chamberTemperature T of external coil Outer plate And the running frequency F of the compressor 1 controls the conditions of defrosting and frequent defrosting of the air conditioner due to no frost which may occur in an unsteady state, so that the user experience can be improved, and energy consumption is prevented.
As can be seen from table 1, when the operating frequency F of the compressor 1 changes suddenly, the outdoor coil temperature T is inevitably caused Outer plate The change, i.e., the outdoor coil temperature T, must occur when the air conditioner 10 begins to enter the false defrost mode Outer plate A reduced condition. I.e. checking the outdoor coil temperature T at the beginning Outer plate In the case of (2), T must be satisfied Outer plate (n+1)＜T Outer plate (n) of (a). However, when the operation frequency F of the compressor 1 is increased, the outdoor heat exchanger 2 may be short-circuited to supply the refrigerant, which may cause the rapid decrease of the evaporating pressure, i.e., the outdoor coil temperature T Outer plate If the outdoor frosting condition is judged only by the outdoor heat exchange temperature difference, the outdoor heat exchange temperature difference is large and cannot reflect the real frosting condition of the outdoor heat exchanger 2 in the sudden rise of the operating frequency F of the compressor 1 and a subsequent period of time, so that the controller 4 cannot accurately judge whether the defrosting condition is really achieved. Wherein, the temperature difference of outdoor heat exchange is delta Tout = outdoor environment temperature Tout-outdoor coil temperature T Outer plate If the outdoor coil temperature T is used at this time Outer plate Lowering the condition for controlling the air conditioner 10 to enter the normal defrost mode leads to a misjudgment, and the air conditioner 10 is likely to erroneously enter the normal defrost mode. Referring to the line in fig. 3, 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 conventional defrosting mode is met or not is judged, at this time, the air conditioner 10 is controlled not to enter the conventional defrosting mode and continues to keep the current heating operation, and the condition that the user experience is influenced due to the fact that the indoor environment temperature is reduced because the air conditioner enters the conventional defrosting mode by mistake is avoided.
It is understood that the specific determination process of the conventional defrost mode is as follows: when the compressor is continuously operated for a period of timeThen, collecting outdoor environment temperature Tout and outdoor coil temperature T Outer plate And determining Tout is less than or equal to a first temperature threshold, T Outer plate When the temperature is less than or equal to the second temperature threshold and delta Tout is greater than or equal to the third temperature threshold, entering a normal defrosting mode, and in the normal defrosting mode, when T is detected Outer plate And when the temperature threshold value of the conventional defrosting mode is not less than the threshold value, the conventional defrosting mode is exited. The first temperature threshold, the second temperature threshold, the third temperature threshold, and the temperature threshold for exiting the normal defrost mode may be set as needed, which is not limited herein.
Based on the above, since the outdoor heat exchange temperature difference Δ Tout cannot indicate the frosting condition in the false defrosting mode, the air conditioner 10 may be controlled to start entering the false defrosting mode without collecting the outdoor ambient temperature Tout, or may be directly assigned to the outdoor ambient temperature Tout by a fixed value, and set the fixed value > a second temperature threshold, and further in the false defrosting mode, the outdoor ambient temperature is always limited to not satisfy the condition of entering the conventional defrosting mode, so as to prevent the conventional defrosting mode from being entered by mistake.
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.
In other embodiments of the present invention, the outdoor coil temperature T at the (m + 1) th time is further determined a first preset number of times in succession Outer plate (m + 1) outdoor coil temperature T not lower than mth moment Outer plate (m) controlling the air conditioner 10 to continuously maintain the heating operation, wherein n is a natural number.
Wherein, different first preset times 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 times can be set to be more than or equal to 2 times, for example, the first preset timesCan be 2 times or 3 times or 4 times or 5 times or 6 times, etc., by controlling the temperature T of the outdoor coil Outer plate Repeated detection and judgment are carried out, and the accuracy of the detection result and the judgment result can be ensured.
Wherein the outdoor coil temperature T at the (n + 1) th moment is determined Outer plate (n + 1) outdoor coil temperature T less than nth time Outer plate (n) thereafter, repeatedly detecting the outdoor coil temperature T Outer plate . Taking the first preset number of times as an example, which may be 2 times, when the outdoor coil temperature T at the (m + 1) th time is detected more than 2 times continuously Outer plate (m + 1) outdoor coil temperature T not lower than the m-th moment Outer plate (m), i.e. T Outer plate (m+1)≥T Outer plate (m) represents the outside coil temperature T Outer plate Inflection point appears, outdoor coil temperature T Outer plate Starting to rise or approaching a steady state, which is still in an unsteady state, the air conditioner 10 should be controlled to continue heating operation.
Specifically, as shown by line N in FIG. 3, during the time period T1-T3, the outdoor coil temperature T Outer plate During the gradual rise-back, the outdoor coil temperature T detected during this process Outer plate Will satisfy T Outer plate (m+1)＞T Outer plate (m) if the outdoor coil temperature T is detected at this time Outer plate Has been restored to the outdoor coil temperature T when the air conditioner 10 is operating in the heating mode normally Outer plate However, in reality, the system is still in an unstable state, and the air conditioner 10 cannot be controlled to immediately exit the false defrost mode, the air conditioner 10 should be controlled to continue the heating operation. And, if the outdoor coil temperature T is detected at this time Outer plate Although it has risen, the outdoor coil temperature T at this point Outer plate The condition for entering the conventional defrosting mode is still low or even satisfied, but because the system is still in an unstable state at this time, if the air conditioner 10 is controlled to immediately exit the false defrosting mode, the air conditioner 10 will directly enter the conventional defrosting mode after exiting the false defrosting mode, and actually the outdoor heat exchanger 2 may have no frost or very little frost, and if the air conditioner 10 still operates the conventional defrosting mode at this time, the indoor ambient temperature will be slightly reduced, so the air conditioner 10 should be controlled to continue to operate for heating at this time, and will not enter the conventional defrosting modeAnd a defrosting mode, wherein the outdoor environment temperature is continuously limited not to meet the condition of entering the conventional defrosting mode so as to prevent the conventional defrosting mode from being entered by mistake.
According to the air conditioner 10 provided by the embodiment of the invention, a false defrosting mode is provided, and the air conditioner is controlled to enter the false defrosting mode by detecting the operating frequency F of the compressor 1 and determining that the increased value delta F of the operating frequency F of the compressor 1 in a preset period exceeds a preset frequency threshold value A. The temperature sensor 3 is used for acquiring the temperature T of the outdoor coil 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 Under the unsteady state of change, can effectively avoid not having the frost and defrosting and the phenomenon of frequent defrosting, control more accurately. And, determining the outdoor coil temperature T during system unsteady conditions Outer plate When the air conditioner starts to rise or is about to tend to be stable, the air conditioner 10 is controlled to continue to keep heating operation, the exit condition of the false defrosting mode is controlled more accurately, and the user experience is improved.
In some embodiments of the invention, in the false defrost mode, the controller 4 is further configured to: recording the outdoor coil temperature T at the (m + 1) th moment determined continuously for a first preset number of times Outer plate (m + 1) outdoor coil temperature T not lower than mth moment Outer plate The operating frequency F of the compressor 1 at the time (m) is the first frequency.
Wherein, as can be seen from the above embodiment, the outdoor coil temperature T at the (n + 1) th time is determined Outer plate (n + 1) outdoor coil temperature T less than nth time Outer plate (n) after that, when T is detected for a first preset number of consecutive times Outer plate (m+1)≥T Outer plate (m), the system may still be in an unstable state at this time, and the operating frequency F of the compressor 1 may not reach a stable operating state at this time, then the operating frequency F of the compressor 1 at this time is recorded as a first frequency, which is generally greater than or equal to the operating frequency F of the compressor 1 when the air conditioner 10 normally operates in the heating mode, and meanwhile, the air conditioner 10 should be controlled to continue to operate in the heating mode without entering the conventional defrosting mode, and repetitive detection and judgment are performedAnd (4) determining.
Further, in other embodiments, the outdoor coil temperature T at time (m + 1) is determined from a first preset number of consecutive times Outer plate (m + 1) outdoor coil temperature T not lower than the m-th moment Outer plate (m) further determining the outdoor coil temperature T Outer plate Keeping the temperature of the outdoor coil T unchanged or determining the (i + 1) th moment Outer plate (i + 1) outdoor coil temperature T less than time i Outer plate (i) And the operating frequency F of the compressor 1 is not greater than the first frequency, where i > m.
Wherein, in some embodiments, the outdoor coil temperature T at the (i + 1) th time is determined Outer plate (i + 1) outdoor coil temperature T less than time i Outer plate (i) While continuously determining the outdoor coil temperature T for a second predetermined number of times Outer plate Meet the outdoor coil temperature T at the (i + 1) th moment Outer plate (i + 1) outdoor coil temperature T less than moment i Outer plate (i)。
Specifically, different first preset times can be set according to the configuration of the air conditioning system and according to the characteristics and configuration of the system, wherein the second preset time can be set to be more than or equal to 2 times, for example, the second preset time can be 2 times or 3 times or 4 times or 5 times or 6 times, etc., and the temperature T of the outdoor coil 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.
Specifically, as shown by line N in FIG. 3, during the time period T1-T3, the outdoor coil temperature T Outer plate During the gradual rise-back, the outdoor coil temperature T detected during this process Outer plate Will satisfy T Outer plate (m+1)≥T Outer plate (m) outdoor coil temperature T at the (m + 1) th detected time Outer plate (m + 1) outdoor coil temperature T not lower than the m-th moment Outer plate (m) after that, there is a need to further detect the outdoor coil temperature T Outer plate . For example, after time T3, the outdoor coil temperature T is sensed Outer plate If the frequency of the compressor 1 is not greater than the first frequency, i.e. if the frequency of the compressor 1 is less than or equal to the first frequency, then the system may have returned to a steady state, which is sure that the frequency of the compressor 1 is not greater than the first frequencyThe operation frequency F of the compressor 1 is also substantially stabilized, and it is confirmed that the system is returned to the stabilized state.
More specifically, as shown by line Q in FIG. 3, during the time period T1-T2, the outdoor coil temperature T Outer plate Also during the gradual rise back, the outdoor coil temperature T is sensed Outer plate Will also satisfy T Outer plate (m+1)≥T Outer plate (m) outdoor coil temperature T at the (m + 1) th detected time Outer plate (m + 1) outdoor coil temperature T not lower than mth moment Outer plate (m) after time T2, further outdoor coil temperature T is detected Outer plate Begin to fall, e.g. determine outdoor coil temperature T at time (i + 1) Outer plate (i + 1) outdoor coil temperature T less than moment i Outer plate (i) Since the outdoor coil temperature T caused for the system unsteady state has been experienced at this time Outer plate Discrimination of fluctuation occurs when the outdoor coil temperature T is detected again Outer plate And the operation frequency F of the compressor 1 is detected not to be greater than the first frequency, that is, the operation frequency F of the compressor 1 is not abruptly changed, the outdoor coil temperature T is confirmed Outer plate The drop may be caused by frost of the outdoor unit.
Based on the above, when it is determined that the system has returned to the steady state, or the system has returned to the steady state and frost layer may occur in the outdoor unit, the air conditioner 10 is controlled to exit the false defrosting mode, continue the heating operation, and cancel the limitation of the outdoor environment temperature.
After the air conditioner 10 exits the false defrost mode, the condition determination for the normal defrost mode needs to be normally performed, and thus the outdoor ambient temperature Tout needs to be normally detected. Based on this, while the air conditioner 10 exits the false defrosting mode, the air conditioner 10 may be set to normally collect the outdoor ambient temperature Tout, or the assignment of the outdoor ambient temperature Tout may be cancelled, so as to ensure that the air conditioner 10 can enter the normal defrosting mode to perform the defrosting operation.
The air conditioner 10 according to the embodiment of the present invention detects the outdoor coil temperature T Outer plate And the operating frequency F of the compressor 1, after it has been determined that the air-conditioning system is fluctuating and tending to stabilize, andthe air conditioner 10 is controlled to exit the false defrosting mode and operate the conventional heating mode, 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 invention, in the false defrost mode, the controller 4 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 And then the temperature T of the outdoor coil pipe is increased 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, and the operating frequency F of the compressor 1 is increased to a second frequency and is not changed, the air conditioner 10 is controlled to defrost outdoors, and the limitation on the outdoor environment temperature is cancelled, 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 indicated by a line Q in fig. 3, the operating frequency F of the compressor 1 suddenly increases and the outdoor coil temperature T starts at 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 back, and after T2 time, the temperature T of the outdoor coil Outer plate It will rise back 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 a line Q in fig. 3, if the operating frequency F of the compressor 1 is not changed and the fluctuation of the air conditioning system is stabilized after a certain period of time, the outdoor coil temperature T occurs Outer plate When the conditions for entering the normal defrost mode are reduced and met, such as the outdoor coil temperature T shown at time T3 Outer plate When the temperature is decreased to the second temperature and the defrosting temperature is reached, that is, the condition for entering the normal defrosting mode is satisfied, it indicates that the outdoor coil is frosted at this time, and the outdoor unit needs to be defrosted, and at this time, the air conditioner 10 can normally perform the defrosting operation. In the skyWhen the air conditioner 10 exits the false defrosting mode and operates the conventional heating mode, the air conditioner 10 may be set to normally collect the outdoor ambient temperature Tout, or the assignment of the outdoor ambient temperature Tout may be cancelled, so as to ensure that the air conditioner 10 can enter the conventional defrosting mode to perform the defrosting operation.
Therefore, the air conditioner 10 according to the embodiment of the present invention is only directed to the outdoor coil temperature T caused by the variation of the operating frequency F of the compressor 1 Outer plate The phenomena of defrosting due to frostless condition, frequent defrosting and the like under the changed unstable condition can not affect the defrosting operation of the air conditioner 10 when the outdoor coil pipe really has defrosting requirements, and the phenomena are more intelligent and can not affect the user experience.
A defrosting control method of an air conditioner according to an embodiment of the present invention will be described with reference to fig. 4 to 8. 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. 4, 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 the compressor.
In some embodiments of the present invention, it is detected that the air conditioner starts to operate the heating mode and the continuous operation time reaches a first preset time period, wherein 10min is less than or equal to the first preset time period.
The method comprises the steps that for a common air conditioner, a compressor can tend to a stable state after being started to operate for 10min, then 10min is set to be less than or equal to a first preset time, if the heating operation state of the air conditioner is detected when the heating operation state of the air conditioner is less than 10min, then the operation frequency of the compressor is still unstable, and the unstable acquired data can influence a judgment result. Wherein the operating frequency of the compressor can be denoted by F.
In the embodiment, when the air conditioner is operated in the heating mode, in the process of actually using the air conditioner by a user, when the indoor environment temperature is reduced, or the user controls the air conditioner to be changed from the mute mode and the low-wind mode to the high-wind mode, or the user controls the air conditioner to be changed from the sleep mode or the mute mode to the normal heating mode, the operating frequency F of the compressor is increased.
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 1 causes the fluctuation of the air conditioning system, and the short-time shortage of the refrigerant flow rate causes the pressure of the evaporating side to drop, which in turn causes the temperature of the outdoor coil to drop suddenly.
In particular, it can be described in connection with fig. 3, wherein the outdoor coil temperature is denoted as T Outer plate As shown in fig. 3, a line M represents the variation of the operating frequency F of the compressor with time; line N represents outdoor coil temperature as T Outer plate The change over time; line Q indicates outdoor coil temperature T Outer plate The change over time.
For example, as shown by line N, the operating frequency F of the compressor suddenly increases and the outdoor coil temperature T begins at time T0 Outer plate Begins to fall and falls to the lowest at the moment T1 if the outdoor coil temperature T is at the moment Outer plate Has been reduced to meet the condition for entering the normal defrost mode. But now the outdoor coil temperature T Outer plate The drop is caused by unstable operation of the compressor, and in fact the outdoor heat exchanger may be frostless or have a very small amount of frost, which may result in a slight drop in the indoor ambient temperature if the air conditioner is still operating in the conventional defrost mode. However, at this time, the air conditioner enters the conventional defrosting mode, which is contrary to the desire of the user to increase the indoor ambient temperature, so that the comfort experience of the user is reduced, and if the air conditioner frequently has a phenomenon of defrosting due to frost-free condition, the user experience is poor, and even the user complaints are caused.
And, as shown by line N, the outdoor coil temperature T after time T3 Outer plate Will return toAnd (4) increasing to a stable state, and if the temperature after the temperature is increased back does not meet the condition that the air conditioner enters the conventional 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 conventional defrosting mode for a short time, so that the corresponding defrosting effect cannot be achieved, and energy is consumed additionally.
Therefore, based on the above situation, the embodiment of the present invention provides a new defrosting control mode, in which a control parameter of a preset frequency threshold is introduced, where the preset frequency threshold is denoted by a, and 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 itself. 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.
It can be understood that, when the air conditioner is in normal operation, the operating frequency F of the compressor may also slightly fluctuate for various reasons, and if the preset frequency threshold a is set to a small value, the air conditioner may frequently enter a false defrosting mode, and control resources may be wasted. Specifically, when the air conditioner is operated in the 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 time duration of the sudden change of the operating frequency F of the compressor is relatively short, and the time for the system to be in an unstable state is also relatively short, the preset period t for detecting the operating frequency F of the compressor 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 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 will be appreciated that by setting the preset period t to a small value, it is possible to detect the variation of the operating frequency F of the compressor in a short time.
Further, when a sudden increase in the operating frequency F of the compressor is detected, an increase in the operating frequency F of the compressor 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 conventional defrosting mode by mistake, the air conditioner can be controlled to enter the false defrosting mode firstly, and then whether the air conditioner needs to be controlled to run the conventional defrosting mode is further determined.
And S3, acquiring the temperature of the outdoor 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 that of the outdoor coil at the nth moment, and controlling the air conditioner to keep heating operation so as not to defrost outdoors, wherein the outdoor environment temperature is limited not to meet the condition of entering the conventional defrosting mode, and n is a natural number.
Wherein, the outdoor coil temperature at the (n + 1) th time is recorded as T Outer plate (n + 1), and recording the outdoor coil temperature at the nth time as T Outer plate (n)。
Specifically, when the operating frequency F of the compressor suddenly increases, the air conditioning system inevitably fluctuates, and the parameters representing the fluctuation of the air conditioning system include the temperature of the indoor coil and the temperature T of the outdoor coil 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.
As can be seen from table 1, a sudden change in the operating frequency F of the compressor 1 versus the outdoor coil temperature T Outer plate Is very much affected and is therefore based on the outdoor coil temperature T Outer plate And the running frequency F of the compressor 1 controls the conditions of defrosting and frequent defrosting of the air conditioner due to no frost which may occur in an unsteady state, so that the user experience can be improved, and energy consumption is prevented.
As can be seen from table 1, when the operating frequency F of the compressor is suddenly changed, the chamber is inevitably causedTemperature T of external coil Outer plate The change, namely the temperature T of the outdoor coil pipe inevitably appears when the air conditioner just starts to enter the false defrosting mode Outer plate The situation is reduced. That is to say the temperature T of the outdoor coil is checked initially Outer plate In the case of change, T must be satisfied Outer plate (n+1)＜T Outer plate (n) of (a). However, when the operating frequency F of the compressor increases, the outdoor heat exchanger may have insufficient refrigerant supply in a short time, which may cause rapid decrease in the evaporating pressure, i.e., the outdoor coil temperature T Outer plate Rapidly reducing the frosting condition, if the frosting condition is judged only through the outdoor heat exchange temperature difference, the frosting condition of the outdoor heat exchanger cannot be reflected if the outdoor heat exchange temperature difference is large in sudden rise of the running frequency F of the compressor and in a subsequent period of time, wherein the outdoor heat exchange temperature difference delta Tout = outdoor environment temperature Tout-outdoor coil temperature T Outer plate Therefore, the controller cannot accurately determine whether it has actually reached the defrost condition. If the temperature T of the outdoor coil pipe is used at the moment Outer plate Lowering the condition for controlling the air conditioner to enter the conventional defrost mode leads to a misjudgment, and the air conditioner is still liable to mistakenly enter the conventional defrost mode. Referring to the line in fig. 3, 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 conventional defrosting mode is met or not is judged, the air conditioner is controlled not to enter the conventional defrosting mode at the moment and the current heating operation is continuously kept, and the condition that the user experience is influenced due to the fact that the indoor environment temperature is reduced because the air conditioner enters the conventional defrosting mode by mistake is avoided.
It will be understood that the specific decision process of the normal defrost mode is to collect the outdoor ambient temperature Tout and the outdoor coil temperature T after the compressor is continuously operated for a period of time Outer plate And determining Tout is less than or equal to a first temperature threshold, T Outer plate When the temperature is less than or equal to the second temperature threshold and the delta Tout is greater than or equal to the third temperature threshold, entering a normal defrosting mode, wherein the first temperature threshold, the second temperature threshold, the third temperature threshold and the temperature threshold for exiting the normal defrosting mode can be set according to the requirementThe setting is not limited herein. Because the outdoor heat exchange temperature difference delta Tout cannot indicate the frosting condition in the false defrosting mode, the air conditioner can be controlled not to collect the outdoor environment temperature Tout when the false defrosting mode is started, or the outdoor environment temperature Tout can be directly assigned with a fixed value, the fixed value is set to be larger than a second temperature threshold value, and further, in the false defrosting mode, the outdoor environment temperature is always limited not to meet the condition of entering the conventional defrosting mode, so that the conventional defrosting mode is prevented from being mistakenly entered.
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) the condition that the detection times are less likely to have false detection, for example, the preset times can be more than or equal to 2 times, for example, the preset times can be 2 times, 3 times, 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, further continuously determining that the temperature of the outdoor coil meets the condition that the temperature of the outdoor coil at the (m + 1) th moment is not lower than that of the outdoor coil at the mth moment for a first preset time, and controlling the air conditioner to continuously keep heating operation, wherein m is a natural number, and the first preset time is more than or equal to 2 times.
Wherein, different first preset times 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 times can be set to be more than or equal to 2 times, for example, the first preset times can be 2 times, 3 times, 4 times, 5 times, 6 times and the like, and 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.
Wherein the outdoor coil temperature T at the (n + 1) th time is determined Outer plate (n + 1) outdoor coil temperature T less than nth time Outer plate (n) thereafter, repeatedly detecting the outdoor coil temperature T Outer plate . Taking the first preset number of times as an example, when T is detected for more than 2 times continuously Outer plate (m+1)≥T Outer plate (m) represents the temperature T of the external coil Outer plate Inflection point appears, outdoor coil temperature T Outer plate Starting to rise or approaching to be stable, and at the moment, still being in an unstable state, the air conditioner 10 should be controlled to continue to keep heating operation, and at the moment, the outdoor environment temperature should be continuously limited not to meet the condition of entering the conventional defrosting mode, so as to prevent entering the conventional defrosting mode by mistake.
Specifically, as shown by line N in FIG. 3, during the time period T1-T3, the outdoor coil temperature T Outer plate During the gradual rise-back, the outdoor coil temperature T detected during this process Outer plate Will satisfy T Outer plate (m+1)≥T Outer plate (m) if the outdoor coil temperature T is detected at this time Outer plate The outdoor coil temperature T when the normal operation heating mode of the air conditioner is recovered Outer plate However, in practice, the system is still in an unstable state, and the air conditioner cannot be controlled to immediately exit the false defrosting mode, the air conditioner 10 should be controlled to continue to maintain the heating operation. And, if the outdoor coil temperature T is detected at this time Outer plate Although it has risen, the outdoor coil temperature T at this time Outer plate The condition of entering the conventional defrosting mode is still low, even satisfied, but since the system is still in an unstable state at this time, if the air conditioner 10 is controlled to exit the false defrosting mode immediately, the conventional defrosting mode will be entered directly after the air conditioner 10 exits the false defrosting mode, and actually, the outdoor heat exchanger may have no frost or very little frost, and if the air conditioner still operates the conventional defrosting mode at this time, the indoor ambient temperature will be slightly decreased. Therefore, the air conditioner 10 should be controlled to continue the heating operation at this time without entering the normal defrosting mode.
According to the defrosting control method of the air conditioner, which is provided by the embodiment of the invention, a false defrosting mode is provided, and the air conditioner is controlled to enter the false defrosting mode when the increase value delta F of the operating frequency F of the compressor in a preset period exceeds a preset frequency threshold value A by detecting the operating frequency F of the compressor. And by obtaining the outdoor coil temperature T Outer plate And further, data reference can be provided for the current operation strategy of the air conditioner. For outdoor coil temperature T caused by compressor running frequency F change Outer plate Altered instabilityUnder the state, the phenomena of defrosting due to frost absence and frequent defrosting can be effectively avoided, and the control is more accurate. And, determining the outdoor coil temperature T during system unsteady conditions Outer plate When the air conditioner starts to rise or is about to tend to be stable, the air conditioner is controlled to continue to keep heating operation, the exit condition of the false defrosting mode is controlled more accurately, and the user experience is improved.
In some embodiments of the present invention, as shown in fig. 5, which is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention, wherein after further continuously determining that the outdoor coil temperature satisfies the outdoor coil temperature at the (m + 1) th time not lower than the outdoor coil temperature at the m-th time for a first preset number of times, the defrosting control method of an air conditioner further includes steps S41 to S43.
And S41, recording the running frequency of the compressor as the first frequency when the outdoor coil temperature at the (m + 1) th moment is not lower than the outdoor coil temperature at the m th moment after continuously determining for the first preset times.
Wherein, as can be seen from the above embodiment, the outdoor coil temperature T at the (n + 1) th time is determined Outer plate (n + 1) outdoor coil temperature T less than nth time Outer plate After (n), when T is detected for a first preset number of times Outer plate (m+1)≥T Outer plate (m), the system may still be in an unstable state at this time, and the operating frequency F of the compressor may not reach a stable operating state at this time, the operating frequency F of the compressor at the next time is recorded as a first frequency F, which is generally greater than or equal to the operating frequency of the compression 1 in the normal operation heating mode of the air conditioner, and meanwhile, the air conditioner should be controlled to continue to keep heating operation without entering the conventional defrosting mode, and repeatability detection and determination are performed.
And S42, further determining that the temperature of the outdoor coil at the (m + 1) th moment is not lower than that of the outdoor coil at the mth moment from the moment of continuously determining that the temperature of the outdoor coil at the (m + 1) th moment is not lower than that of the outdoor coil at the mth moment for a first preset number of times, or determining that the temperature of the outdoor coil at the (i + 1) th moment is lower than that of the outdoor coil at the ith moment and the running frequency of the compressor is not higher than a first frequency, wherein i is greater than m.
Wherein, in some embodimentsAt the time of determining the (i + 1) th outdoor coil temperature T Outer plate (i + 1) outdoor coil temperature T less than time i Outer plate (i) While, the outdoor coil temperature T is determined for a second predetermined number of consecutive times Outer plate Meet the outdoor coil temperature T at the (i + 1) th moment Outer plate (i + 1) outdoor coil temperature T less than moment i Outer plate (i)。
Specifically, different first preset times can be set according to the configuration of the air conditioning system and according to the characteristics and configuration of the system, wherein the second preset time can be set to be more than or equal to 2 times, for example, the second preset time can be 2 times, 3 times, 4 times, 5 times, 6 times, etc., and the temperature T of the outdoor coil 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.
Specifically, as shown by line N in FIG. 3, during the time period T1-T3, the outdoor coil temperature T Outer plate Outdoor coil temperature T detected during gradual ramp-up Outer plate Will satisfy T Outer plate (m+1)≥T Outer plate (m) outdoor coil temperature T at the (m + 1) th detected time Outer plate (m + 1) outdoor coil temperature T not lower than the m-th moment Outer plate (m) after that, further detecting the outdoor coil temperature T Outer plate . For example, after time T3, the outdoor coil temperature T is sensed Outer plate If the frequency is not changed, the system may be returned to the steady state, and the operating frequency F of the compressor is detected to be not higher than the first frequency, that is, the operating frequency F of the compressor is less than or equal to the first frequency, and it is determined that the operating frequency F of the compressor also substantially reaches the steady state, and it is determined that the system is returned to the steady state.
More specifically, as shown by line Q in FIG. 3, during the time period T1-T2, the outdoor coil temperature T Outer plate The temperature T of the outdoor coil is also detected during the gradual rise-back process Outer plate Will also satisfy T Outer plate (m+1)≥T Outer plate (m) outdoor coil temperature T at the (m + 1) th detected time Outer plate (m + 1) outdoor coil temperature T not lower than mth moment Outer plate (m) after time T2, further outdoor coil temperature T is detected Outer plate Begin to fall, e.g. determine outdoor coil temperature T at time (i + 1) Outer plate (i + 1) outdoor coil temperature T less than moment i Outer plate (i) Since the outdoor coil temperature T caused for the system unsteady state has been experienced at this time Outer plate Discrimination of the occurrence of fluctuations when the outdoor coil temperature T is again detected Outer plate And the operation frequency F of the compressor is detected to be not more than the first frequency, namely the operation frequency F of the compressor is not suddenly changed, the outdoor coil temperature T is confirmed Outer plate The drop may be caused by frost of the outdoor unit.
And S43, controlling the air conditioner to exit the false defrosting mode, continuing heating operation and canceling limitation on the outdoor environment temperature.
Based on the above, when it is determined that the system has recovered to the stable state, or the system has recovered to the stable state and the outdoor unit may have frost, the air conditioner is controlled to exit the false defrosting mode, and the heating operation is continued. Further, after the air conditioner exits the false defrost mode, the condition determination of the normal defrost mode needs to be normally performed, and thus the outdoor ambient temperature Tout needs to be normally detected. Therefore, the air conditioner can normally collect the outdoor environment temperature Tout when the air conditioner exits the false defrosting mode, or the assignment of the outdoor environment temperature Tout is cancelled, so that the air conditioner can enter the conventional defrosting mode to execute the defrosting operation.
According to the defrosting control method of the air conditioner, the temperature T of the outdoor coil pipe is detected Outer plate And the running frequency F of the compressor is used for timely controlling the air conditioner to exit the false defrosting mode and run the conventional heating mode after the fact that the air conditioning system fluctuates and tends to be stable is determined, so that 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 present invention, as shown in fig. 6, there is a flowchart of a defrosting control method of an air conditioner according to still another embodiment of the present invention, wherein the 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 again, the temperature of the outdoor coil keeps unchanged after rising 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 to the first temperature reaches the first time length, the operating frequency of the compressor is increased to the second frequency and is not changed, the air conditioner is controlled to carry out outdoor defrosting, the limitation on the temperature of the outdoor environment is cancelled, and 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 operating frequency F of the compressor suddenly increases and the outdoor coil temperature T starts at 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 rises back and the temperature T of the outdoor coil pipe is increased after the time T2 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. 3, 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 the normal defrost mode is lowered and satisfied, e.g. the outdoor coil temperature T as shown at time T3 Outer plate When the temperature is lowered to the second temperature and the defrosting temperature is reached, namely the condition of entering the conventional defrosting mode is met, the fact that the outdoor coil is frosted at the moment is indicated, the outdoor unit needs to be defrosted, and at the moment, the air conditioner can normally execute defrosting operation. When the air conditioner exits the false defrosting mode and runs the conventional heating mode, the air conditioner can be set to normally collect the outdoor environment temperature Tout, or the assignment of the outdoor environment temperature Tout is cancelled, so that the air conditioner can enter the conventional defrosting mode to execute defrosting operation.
Therefore, the defrosting control method of the air conditioner in the embodiment of the invention only aims at the outdoor coil temperature T caused by the change of the running frequency F of the compressor Outer plate Frost free defrosting and frequent defrost in varying unsteady statesDefrosting operation of the air conditioner when the outdoor coil pipe really has defrosting requirements can not be influenced, and the air conditioner is more intelligent and does not influence user experience.
Synthesize above information, the difference in temperature increase of indoor temperature reduction and indoor temperature and settlement temperature can lead to the operating frequency F of compressor to rise fast, and the operating frequency F of compressor changes and has led to air conditioning system's fluctuation, and when the operating frequency F of compressor risees, refrigerant supply is not enough in 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 frosting condition of the real 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, false defrosting and frequent defrosting of the air conditioner can be caused, the comfort 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. 7 and 8, and as shown in fig. 7, 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 first preset time, and acquiring the operating frequency of the compressor. Wherein the first operation time period can be 10min.
S103, detecting the increase of the operating frequency F of the compressor, judging whether the Δ F is more than A, if so, 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.
In some embodiments of the present invention, as shown in fig. 8, a flowchart of an air conditioner defrosting control method according to another embodiment of the present invention is provided, wherein the air conditioner defrosting control method further includes steps S105-S113, 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 determination result is "yes", step S107 is executed, and if the determination result is "no", step S111 is executed to keep the heating mode operation.
S107, judging whether more than two consecutive values all satisfy T Outer plate (m+1)≥T Outer plate (m) tm represents the time and F1 represents the operating frequency F of the compressor, and if the determination result is yes, step S108 is executed, and if the determination result is no, step S111 is executed.
S108, after the time tm, continuously detecting the temperature T of the outdoor coil Outer plate Judging whether more than two consecutive values all satisfy T Outer plate (i+1)＜T Outer plate (i) Or T Outer plate (i+1)＝T Outer plate (i) And if the operation frequency of the compressor is stable and F is less than or equal to F1, executing step S109 if the judgment result is yes, and executing step S111 if the judgment result is no.
And S109, keeping the current heating mode and exiting the false defrosting mode.
And S110, entering a conventional heating mode.
And S111, keeping the heating mode to operate.
S113, whether T in three continuous periods is met or not is continuously judged Outer plate (n+1)＜T Outer plate (n), if the judgment result is yes, the process returns to the step S107, and if the judgment result is no, the process goes to the step S109, the current heating mode is maintained, the false defrosting mode is exited, and the normal heating mode is entered.
And, the temperature T of the outdoor coil is also detected when the step S111 is executed Outer plate And judging whether more than two consecutive values satisfy T Outer plate (n+1)＜T Outer plate (n), that is, the air conditioner of the present embodiment removes the heat generated during the heating mode operationThe frost control method can repeatedly execute the steps S106 to S113, thereby realizing the circulation monitoring of the running state of the air conditioner and avoiding the situations of defrosting and frequent defrosting due to frost absence under the unsteady state of the system.
According to the defrosting control method of the air conditioner provided by the embodiment of the invention, the temperature T of the outdoor coil pipe can be introduced on the basis of taking the outdoor environment temperature, the temperature of the outdoor coil pipe, the temperature of the indoor coil pipe, the exhaust temperature and the like as parameters for controlling the air conditioner to enter the conventional defrosting mode Outer plate And the running frequency F of the compressor is controlled according to the conditions of defrosting due to frostless condition and frequent defrosting when the running frequency F of the compressor is in an unstable state, so that the control is more accurate, the additional energy consumption is avoided, and the comfortable experience of a user is improved.
Other configurations and operations of the air conditioner 10 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 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:
a compressor and an outdoor heat exchanger;
the temperature sensor is arranged on the outdoor heat exchanger and used for detecting the temperature of the outdoor coil;
a controller connected with the compressor and the temperature sensor, the controller configured to:
when the air conditioner is in heating operation, acquiring the operating frequency of the compressor, 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;
in the false defrosting mode, the temperature of the outdoor coil is 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 n th moment, the air conditioner is controlled to keep heating operation so as not to carry out outdoor defrosting, the outdoor environment temperature is limited not to meet the condition of entering the conventional defrosting mode, the temperature of the outdoor coil at the (m + 1) th moment is further determined to be not lower than the temperature of the outdoor coil at the m th moment continuously for a first preset time, the air conditioner is controlled to keep heating operation continuously, wherein m and n are natural numbers, and the first preset time is not less than 2 times.
2. The air conditioner of claim 1, wherein in the false defrost mode, the controller is further configured to: recording the operation frequency of the compressor at the moment when the outdoor coil temperature at the (m + 1) th moment is determined to be not lower than the outdoor coil temperature at the mth moment for a first preset number of times, starting from the moment when the outdoor coil temperature at the (m + 1) th moment is determined to be not lower than the outdoor coil temperature at the mth moment for the first preset number of times, further determining that the outdoor coil temperature is kept unchanged or determining that the outdoor coil temperature at the (i + 1) th moment is lower than the outdoor coil temperature at the ith moment and the operation frequency of the compressor is not higher than the first frequency, controlling the air conditioner to exit the false defrosting mode, continuing heating operation and canceling limitation on the outdoor environment temperature, wherein the second preset number is not lower than 2 times, and i is larger than m.
3. The air conditioner of claim 2, wherein the controller is further configured to determine that the outdoor coil temperature at the (i + 1) th time is less than the outdoor coil temperature at the i-th time for a second preset number of times, wherein the second preset number is greater than or equal to 2 times, when the outdoor coil temperature at the (i + 1) th time is determined to be less than the outdoor coil temperature at the i-th time.
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, the outdoor coil temperature remains unchanged after reaching the first temperature, the outdoor coil temperature is reduced to a second temperature again after reaching the first time length and the operation frequency of the compressor is increased to a second frequency and is unchanged, controlling the air conditioner to perform outdoor defrosting, and canceling the limitation on the outdoor environment temperature, wherein the second temperature reaches the defrosting temperature.
5. The air conditioner as claimed in any one of claims 1 to 4, wherein the controller is further configured to determine the air conditioner heating operation by detecting that the air conditioner starts the operation heating mode and the continuous operation time reaches a first preset time period, wherein 10min is less than or equal to the first preset time period.
6. A defrosting control method of an air conditioner is characterized by comprising the following steps:
detecting the heating operation of the air conditioner, and acquiring the operating frequency of the compressor;
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;
acquiring the outdoor coil temperature from the moment of entering the false defrosting mode, determining that the outdoor coil temperature at the (n + 1) th moment is less than the outdoor coil temperature at the nth moment, controlling the air conditioner to keep heating operation so as not to defrost outdoors, and limiting that the outdoor environment temperature does not meet the condition of entering the conventional defrosting mode, wherein n is a natural number;
and further continuously determining the temperature of the outdoor coil pipe for the first preset time to meet the condition that the temperature of the outdoor coil pipe at the (m + 1) th moment is not lower than the temperature of the outdoor coil pipe at the mth moment, and controlling the air conditioner to continuously keep heating operation, wherein m is a natural number, and the first preset time is more than or equal to 2 times.
7. The air conditioner defrost control method of claim 6, wherein after further determining in succession for a first preset number of times that the outdoor coil temperature satisfies the outdoor coil temperature at time (m + 1) not lower than the outdoor coil temperature at time m, the control method further comprises:
recording the operating frequency of the compressor at the moment when the outdoor coil temperature at the (m + 1) th moment is not lower than the outdoor coil temperature at the mth moment as a first frequency determined continuously for a first preset number of times;
starting from the moment that the outdoor coil temperature at the (m + 1) th moment is determined to be not lower than the outdoor coil temperature at the mth moment for a first preset time, further determining that the outdoor coil temperature is kept unchanged or determining that the outdoor coil temperature at the (i + 1) th moment is lower than the outdoor coil temperature at the ith moment and the running frequency of the compressor is not higher than the first frequency, wherein i is larger than m, and the second preset time is larger than or equal to 2 times;
and controlling the air conditioner to exit the false defrosting mode, continuing heating operation and canceling limitation on the outdoor environment temperature.
8. The air conditioner defrost control method of claim 7, wherein determining that the outdoor coil temperature at time (i + 1) is less than the outdoor coil temperature at time i comprises:
and continuously determining the outdoor coil temperature for a second preset time, wherein the outdoor coil temperature at the (i + 1) th moment is less than the outdoor coil temperature at the i th moment, and the second preset time is more than or equal to 2 times.
9. The air conditioner defrost control method of claim 6, further comprising:
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, the outdoor coil temperature remains unchanged after reaching the first temperature, the outdoor coil temperature is reduced to a second temperature again after reaching the first time length and the operation frequency of the compressor is increased to a second frequency and is unchanged, controlling the air conditioner to perform outdoor defrosting, and canceling the limitation on the outdoor environment temperature, wherein the second temperature reaches the 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 first preset time, wherein the first preset time is less than or equal to 10min.
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