CN115031351A - Air conditioner and defrosting control method thereof - Google Patents

Air conditioner and defrosting control method thereof Download PDF

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Publication number
CN115031351A
CN115031351A CN202210760685.4A CN202210760685A CN115031351A CN 115031351 A CN115031351 A CN 115031351A CN 202210760685 A CN202210760685 A CN 202210760685A CN 115031351 A CN115031351 A CN 115031351A
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China
Prior art keywords
frequency
preset
air conditioner
temperature difference
defrosting mode
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CN202210760685.4A
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CN115031351B (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 CN202210760685.4A priority Critical patent/CN115031351B/en
Publication of CN115031351A publication Critical patent/CN115031351A/en
Priority to PCT/CN2023/085882 priority patent/WO2024001373A1/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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/40—Damper positions, e.g. open or closed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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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 of the air conditioner, wherein the air conditioner comprises a controller, the controller is configured to acquire a temperature difference value between a set temperature and an indoor environment temperature when the air conditioner is in heating operation, determine that an increase value of a temperature difference value in a preset period exceeds a preset temperature difference threshold value, and control the air conditioner to enter a false defrosting mode; recording the current operating frequency of the compressor as a first frequency and an outdoor heat exchange temperature difference at the initial moment of entering the false defrosting mode, and controlling the air conditioner to keep heating operation so as not to carry out a conventional defrosting mode; when the operation frequency is determined to be kept unchanged in n continuous preset periods, recording the current operation frequency of the compressor at the current moment as a second frequency; and controlling the air conditioner to continuously maintain the false defrosting mode within a preset time according to the first frequency, the outdoor heat exchange temperature difference and the second frequency, and exiting the false defrosting mode after the preset time is exceeded. The air conditioner can avoid the phenomena of defrosting due to frost and frequent defrosting, avoid energy consumption and ensure user experience.

Description

Air conditioner and defrosting control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a defrosting control method of the air conditioner.
Background
Winter is when outdoor ambient temperature is lower, during the long-time operation mode of heating of air conditioner, the off-premises station of air conditioner is evaporation side and is easily frosted, and then can lead to heating the effect and descend, and thick along with the increase frost layer of frosting time, the frost layer can increase the heat transfer thermal resistance of the outer machine of air-conditioner, lead to outdoor air circulation area to reduce, the flow resistance increases, can lead to the amount of wind of off-premises station to reduce, and then can make outdoor evaporating temperature further reduce, the heat exchange worsens, and reduce indoor environment travelling comfort, can't satisfy user's demand, reduce user experience. Therefore, after the air conditioner operates for a period of time, it needs to be effectively defrosted in time. The existing defrosting technologies mainly comprise refrigeration mode (reverse cycle) defrosting, bypass defrosting and phase-change energy storage defrosting.
The air conditioner generally adopts a refrigeration mode (reverse cycle) to defrost, and in the related art, when the air conditioner performs the defrosting mode, the outdoor environment temperature Tout and the outdoor heat exchange temperature difference are used to determine whether the defrosting condition is satisfied, wherein the outdoor heat exchange temperature difference is the outdoor environment temperature Tout-the outdoor coil temperature T Outer plate . In the mode, on the occasion of entering the defrosting mode, for some special scenes such as increase of indoor heat exchange temperature difference or increase of indoor wind speed, the operation frequency F of the compressor suddenly rises to enable T Outer plate The temperature difference of the outdoor heat exchange is suddenly increased to meet the defrosting condition, and the defrosting mode is started. 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, an object of the present invention is to provide an air conditioner, which can effectively avoid the phenomena of defrosting due to frost absence and frequent defrosting, and can exit the false defrosting mode in time, thereby avoiding additional energy consumption and ensuring 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 solve the above problem, an embodiment of a first aspect of the present invention provides an air conditioner, including: a compressor; the first temperature sensor is used for collecting the indoor environment temperature; a controller connected to the compressor and the first temperature sensor, respectively, the controller configured to: when the air conditioner is in heating operation, acquiring a temperature difference value between a set temperature and an indoor environment temperature, determining that the increase value of the temperature difference value in a preset period exceeds a preset temperature difference threshold value, and controlling the air conditioner to enter a false defrosting mode; under the false defrosting mode, recording the current operation frequency of the compressor as a first frequency and the outdoor heat exchange temperature difference at the initial moment of entering the false defrosting mode, and controlling the air conditioner to keep heating operation so as not to carry out a conventional defrosting mode; when the operation frequency is determined to be kept unchanged in n continuous preset periods, recording the current operation frequency of the compressor at the current moment as a second frequency, wherein n is greater than 1; and controlling the air conditioner to continuously maintain the false defrosting mode within a preset time according to the first frequency, the outdoor heat exchange temperature difference and the second frequency, and controlling the air conditioner to exit the false defrosting mode after the preset time is exceeded.
According to the air conditioner 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 temperature difference value between the set temperature and the indoor environment temperature is periodically detected and the increase value of the temperature difference value in the preset period is determined to exceed the preset temperature difference threshold value. The unstable state condition that the running frequency of the compressor suddenly rises due to the change of the temperature difference value to further cause the temperature change of the outdoor coil pipe can be effectively avoided, the phenomena of defrosting due to frost absence and frequent defrosting can be effectively avoided, and the control is more accurate.
In some embodiments, the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode based on the first frequency, the outdoor heat exchange delta t, and the second frequency, is further configured to: when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than a first preset temperature difference, and the second frequency is determined to be not higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a first preset time period, and after the first preset time period is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be not higher than a second preset frequency and higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a second preset time, and after the second preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be not higher than a third preset frequency and higher than a second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a third preset time, and after the third preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be higher than a third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a fourth preset time, and after the fourth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; the first preset frequency is less than the second preset frequency and less than the third preset frequency, and the fourth preset time is greater than the third preset time and greater than the second preset time and greater than the first preset time.
In some embodiments, the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode based on the first frequency, the outdoor heat exchange delta t, and the second frequency, is further configured to: when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than a second preset temperature difference, and the second frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a fifth preset time, and after the fifth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the second preset temperature difference, and the second frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, controlling the air conditioner to maintain the false defrosting mode within a sixth preset time, and controlling the air conditioner to exit the false defrosting mode and enter a conventional defrosting mode after the sixth preset time is exceeded; when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the second preset temperature difference, and the second frequency is determined to be higher than the third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a seventh preset time, and after the seventh preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; the second preset temperature difference is larger than the first preset temperature difference, and the seventh preset time is larger than the sixth preset time and larger than the fifth preset time.
In some embodiments, the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode based on the first frequency, the outdoor heat exchange delta t, and the second frequency, is further configured to: when the first frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the outdoor heat exchange temperature difference is lower than a third preset temperature difference, and the second frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within an eighth preset time, and after the eighth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the outdoor heat exchange temperature difference is lower than a third preset temperature difference, and the second frequency is determined to be higher than the third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a ninth preset time, and after the ninth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; the third preset temperature difference is larger than the second preset temperature difference, and the ninth preset time length is larger than the eighth preset time length.
In some embodiments, the controller is further configured to: and acquiring the rotating speed of an indoor fan, determining that the increasing value of the rotating speed of the indoor fan in the preset period exceeds a preset rotating speed value, and controlling the air conditioner to enter the false defrosting mode.
In some embodiments, the controller is further configured to: in the false defrost mode, defining that the outdoor ambient temperature does not satisfy a condition for entering the normal defrost mode; after entering the normal defrost mode, the limitation of the outdoor ambient temperature is removed.
An embodiment of a second aspect of the present invention provides a defrosting control method for an air conditioner, including: when the air conditioner is in heating operation, acquiring a temperature difference value between a set temperature and an indoor environment temperature, determining that the increase value of the temperature difference value in a preset period exceeds a preset temperature difference threshold value, and controlling the air conditioner to enter a false defrosting mode; under the false defrosting mode, recording the current operation frequency of the compressor as a first frequency and the outdoor heat exchange temperature difference at the initial moment of entering the false defrosting mode, and controlling the air conditioner to keep heating operation so as not to carry out a conventional defrosting mode; when the operation frequency is determined to be kept unchanged in n continuous preset periods, recording the current operation frequency of the compressor at the current moment as a second frequency, wherein n is greater than 1; and controlling the air conditioner to continuously maintain the false defrosting mode within a preset time according to the first frequency, the outdoor heat exchange temperature difference and the second frequency, and controlling the air conditioner to exit the false defrosting mode after the preset time is exceeded.
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 temperature difference value between the set temperature and the indoor environment temperature is periodically detected and the increase value of the temperature difference value in the preset period is determined to exceed the preset temperature difference threshold. Under the unsteady state that the temperature difference value changes to cause the sudden rise of the running frequency of the compressor and further cause the temperature change of the outdoor coil, the phenomena of defrosting due to frost absence and frequent defrosting can be effectively avoided, and the control is more accurate.
In some embodiments, the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode according to the first frequency, the outdoor heat exchange temperature difference, and the second frequency, further comprises: when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than a first preset temperature difference, and the second frequency is determined to be not higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a first preset time period, and after the first preset time period is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be not higher than a second preset frequency and higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a second preset time, and after the second preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be not higher than a third preset frequency and higher than a second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a third preset time, and after the third preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be higher than a third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a fourth preset time, and after the fourth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; the first preset frequency is less than the second preset frequency and less than the third preset frequency, and the fourth preset time is greater than the third preset time and greater than the second preset time and greater than the first preset time.
In some embodiments, the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode according to the first frequency, the outdoor heat exchange temperature difference, and the second frequency, further comprises: when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than a second preset temperature difference, and the second frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a fifth preset time, and after the fifth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the second preset temperature difference, and the second frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a sixth preset time, and after the sixth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the second preset temperature difference, and the second frequency is determined to be higher than the third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a seventh preset time, and after the seventh preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; the second preset temperature difference is larger than the first preset temperature difference, and the seventh preset time is larger than the sixth preset time and larger than the fifth preset time.
In some embodiments, the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode according to the first frequency, the outdoor heat exchange temperature difference, and the second frequency, further comprises: when the first frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the outdoor heat exchange temperature difference is lower than a third preset temperature difference, and the second frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within an eighth preset time, and after the eighth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; when the first frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the outdoor heat exchange temperature difference is lower than a third preset temperature difference, and the second frequency is determined to be higher than the third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a ninth preset time, and after the ninth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode; the third preset temperature difference is larger than the second preset temperature difference, and the ninth preset time length is larger than the eighth preset time length.
In some embodiments, further comprising: and acquiring the rotating speed of an indoor fan, determining that the increasing value of the rotating speed of the indoor fan in the preset period exceeds a preset rotating speed value, and controlling the air conditioner to enter the false defrosting mode.
In some embodiments, further comprising: in the false defrost mode, defining that the outdoor ambient temperature does not satisfy a condition for entering the normal defrost mode; after entering the normal defrost mode, the outdoor ambient temperature is de-limited.
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 perspective view of an external appearance of an air conditioner according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an outline of the structure of an air conditioner according to one embodiment of the present invention;
fig. 3 is a block diagram of an air conditioner according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the outdoor coil temperature as affected by the operating frequency of the compressor according to one embodiment of the present invention;
FIG. 5 is a flow chart of a false defrost mode control method according to one embodiment of the present invention;
FIG. 6 is a flowchart of an air conditioner defrost control method according to an embodiment of the present invention;
fig. 7 is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention;
fig. 8 is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention;
fig. 9 is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention;
fig. 10 is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention;
fig. 11 is a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention.
Reference numerals:
1: an air conditioner; 2: an outdoor unit; 3: an indoor unit; 4: connecting a pipe;
11: a compressor; 16: an indoor heat exchanger; 22: an outdoor heat exchanger; 26: an outdoor control device; 31: an indoor fan; 32: a first temperature sensor; 35: an indoor control device; 50: and a controller.
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 storage, reverse cycle defrosting and bypass defrosting all have the not enough problem of heat source, and the heat storage defrosting is under the heating mode, gets up partial heat storage, is giving out the heat when needing the defrosting, and the mode of often adopting the parcel compressor carries out the energy storage, nevertheless under the refrigeration mode in summer, influences the compressor heat dissipation, easily leads to exhaust temperature too high, and the heat accumulator energy storage is limited simultaneously, at present not universal application.
The existing air conditioner generally adopts a refrigeration mode (reverse cycle) defrosting mode, and in order to ensure that the heating efficiency of the indoor environment is not influenced, the outdoor unit is effectively defrosted in time, so that defrosting or excessive frosting caused by frost is avoided. When the refrigeration mode is adopted for defrosting, the indoor environment temperature can be obviously reduced because the indoor heat exchanger is used as an evaporation end, so that the heating effect of the air conditioner is influenced, and the comfort experience of a user is influenced. Especially, in some special scenes, for example, the temperature of the outdoor coil pipe is rapidly reduced due to the sudden increase of the operating frequency F of the compressor, so that the temperature difference of outdoor heat exchange is suddenly increased to meet the defrosting condition, and then the defrosting is carried out. However, since there is no frost or very thin frost on the outdoor heat exchanger, the heating capability is very strong, and performing the defrosting mode causes a large fluctuation in the room temperature, reduces the user comfort, and also consumes additional energy.
Based on the above, in order to solve the problem that the operating frequency F of the compressor suddenly rises to cause the temperature of the outdoor coil to rapidly drop, so that the temperature difference of outdoor heat exchange 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 clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies 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 liquid-phase refrigerant in a high-temperature and high-pressure state 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-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
The air conditioner 1 shown in fig. 1 includes: the indoor unit 3 is exemplified by an indoor unit (shown in the figure), and the indoor unit is usually mounted on an indoor wall surface. For another example, an indoor cabinet (not shown) is also an indoor unit of the indoor unit. The outdoor unit 2 is generally installed outdoors and used for heat exchange in an indoor environment.
Fig. 2 shows a circuit configuration of the air conditioner 1, and the air conditioner 1 is provided with an indoor controller 50 for controlling the operation of each component in the air conditioner 1 so that each component of the air conditioner 1 can operate to realize each predetermined function of the air conditioner 1.
Further, as shown in fig. 2, the air conditioner 1 is also provided with a compressor 11, an outdoor heat exchanger 22, and an indoor heat exchanger 16. Among them, the indoor heat exchanger 16 and the outdoor heat exchanger 22 operate as a condenser or an evaporator, i.e., one operates as a condenser and the other operates as an evaporator. The compressor 11 sucks the refrigerant from the suction port, and discharges the refrigerant compressed therein to the indoor heat exchanger 16 from the discharge port. The compressor 11 is an inverter compressor with variable capacity that performs rotational speed control by an inverter.
As shown in fig. 2, the controller 50 includes an outdoor control device 26 incorporated in the outdoor unit 2 and an indoor control device 35 incorporated in the indoor unit 3. The outdoor control device 26 and the indoor control device 35 are connected to each other by signal lines, and can transmit and receive signals to and from each other.
In an embodiment, the air conditioner 1 of the present application further includes a first temperature sensor 32, and as shown in fig. 3, the controller 50 is connected to the compressor 11 and the first temperature sensor 32, respectively.
Among them, as shown in fig. 2, the first temperature sensor 32 may be provided on the indoor heat exchanger 16 to detect the indoor ambient temperature and transmit the detected indoor ambient temperature to the controller 50 of the air conditioner 1.
In order to solve the above problem, the controller 50 of the present application is configured to avoid the problem of defrosting the air conditioner 1 without frost by the following steps during the heating operation of the air conditioner 1.
Firstly, when the air conditioner 1 is in heating operation, the temperature difference value between the set temperature and the indoor environment temperature is obtained, the temperature difference value in the preset period is determined to exceed the preset temperature difference threshold value, and the air conditioner 1 is controlled to enter the false defrosting mode.
Wherein the temperature T is set Setting up The temperature set for the user according to the requirement of the user on the indoor temperature can be set through an air conditioner APP or a control panel on a remote controller or a mobile terminal. Temperature difference value delta T is equal to set temperature T Setting up Indoor ambient temperature T Inner ring 。
It can be understood that the indoor ambient temperature T of the space where the user is located Inner ring When the user demand is not met, the user can increase the set temperature T Setting up To raise indoor ambient temperature T Inner ring To raise the set temperature T Setting up This will result in an increase in the temperature difference Δ T when the air conditioner 1 detects the set temperature T Setting up When the frequency is increased, the operation frequency is increased, and the work is increased to improve the heating capacity.
Or, after the user uses the air conditioner 1 to heat for a period of time, the air conditioner 1 slowly reduces the frequency from the initial high-frequency operation to the low-frequency operation as the temperature difference value Δ T becomes smaller and smaller, and when the temperature T set by the user is reached Setting up The air conditioning system is required to maintain medium and low frequency operation. During the period, if the window is opened, the door is opened or the personnel change frequently, the indoor environment temperature T can be caused Inner ring And reducing and increasing the temperature difference value delta T, and when the air conditioner 1 detects that the temperature difference value delta T is increased, the air conditioning system can be subjected to frequency increasing operation again according to the detection result. Based on this, the increase of the temperature difference value delta T inevitably causes the work of the refrigerating system to increase, namely the operation frequency F of the compressor 11 increases, so that the increase of the temperature difference value delta T represents the increase of heat required by a user, the increase of the temperature difference value delta T causes the increase of the operation frequency F of the compressor 11 to cause the transient fluctuation of the air conditioning system, the sudden increase of the operation frequency F of the compressor 11 causes the short-time insufficient supply of refrigerants, further causes the reduction of the evaporation pressure of the air conditioning operation system, and the reduction of the evaporation temperature, namely the temperature T of the outdoor coil pipe is reduced Outer plate Decrease rapidly and lowOutdoor coil temperature T in high-frequency stable operation Outer plate . At this time, if the defrosting determination is performed according to the outdoor heat exchange temperature difference and the operation time of the compressor 11, it may be determined that the air conditioner 1 satisfies the defrosting condition for entering the conventional defrosting mode, and the conventional defrosting mode is very easy to enter, but actually, there may be no frost or a small amount of frost on the outdoor heat exchanger 22, and only the fluctuation of the air conditioning system is caused by the sudden increase of the frequency, and the insufficient supply of the refrigerant flow in a short time may cause the outdoor coil temperature T Outer plate The defrosting condition is satisfied, and therefore, if the defrosting operation is performed at this time, the indoor temperature is decreased, which affects the comfort experience of the user.
Or, when the user controls the air conditioner 1 to be changed from the sleep or mute mode to the low-frequency and low-wind-speed heating mode, the air conditioner 1 does not reach the indoor temperature requirement of the user after running for a period of time, feels cold, and is changed into the high-wind conventional heating running; or when the user starts the machine for a period of time by using high wind or strong wind, the indoor environment temperature T Inner ring The air conditioner 1 can meet the user requirements, and is changed into a low-wind mode to operate, the heat exchange of the indoor heat exchanger 16 becomes poor, the temperature of the indoor coil pipe can rise when the indoor coil pipe is changed initially, the current protection or the inner disc overload protection can be triggered at the moment to reduce the frequency, the air conditioner 1 can operate at a low frequency, and after the air conditioner operates for a period of time, if the indoor environment temperature T is higher than the indoor environment temperature T Inner ring The operating frequency F of the compressor 11 rises rapidly, causing the outdoor coil temperature T to fall, not meeting the user's requirements, and the user changes again to high or strong wind to remove the protection mode Outer plate The defrosting mode is quickly reduced, the outdoor heat exchange temperature difference is easy to meet the defrosting condition, the false defrosting phenomenon is caused, the indoor temperature is reduced, and the comfortable experience of a user is influenced.
Illustratively, as shown in fig. 4, the outdoor coil temperature is a schematic diagram of the effect of the operating frequency F of the compressor 11 on the outdoor coil temperature according to one 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 11 over time; line N in the figure represents the outdoor coil temperature T Outer plate A change over time(ii) a Line Q in the figure represents the outdoor coil temperature T Outer plate Another variation over time.
For example, as shown by lines M and N, at time T0, the operating frequency F of the compressor 11 suddenly increases and the outdoor coil temperature T Outer plate Begins to drop and drops to a minimum at time T10 if the outdoor coil temperature T Outer plate Has been reduced to meet the conditions for entering the normal defrost mode. But now the outdoor coil temperature T Outer plate The drop is caused by the instability of the operating frequency F of the compressor 11, and in fact the outdoor heat exchanger 22 may be frostless or have a very low amount of frost, which would result in the indoor ambient temperature T if the air conditioner 1 were still operating in the normal defrost mode Inner ring Slightly decreased. However, the intention of the user to control the air conditioner 1 to increase the air output or to change from the sleep or mute mode to the heating mode is to increase the indoor ambient temperature T Inner ring The air conditioner 1 entering the conventional defrosting mode is contrary to the user's will, so that the user's comfort experience is reduced, and if the air conditioner 1 frequently has the phenomenon of defrosting due to frost-free, the user's experience feeling is poor, and even the user complaints are caused.
And, as shown by line N, the outdoor coil temperature T after time T13 Outer plate The temperature will return to the steady state, and if the temperature after the return does not meet the condition that the air conditioner 1 enters the normal defrosting mode, the air conditioner 1 needs to exit the normal defrosting mode again and continue to operate the heating mode. In this process, the air conditioner 1 briefly operates in the conventional defrosting mode, which not only fails to achieve the corresponding defrosting effect, but also consumes additional energy.
In short, the operating frequency F of the compressor 11 is increased due to the change of the setting mode by the user or the change of the ambient temperature of the user, the refrigerant is not supplied to the outdoor heat exchanger 22 for a short time, and the evaporating pressure is rapidly decreased, i.e. the outdoor coil temperature T Outer plate Rapidly reducing to meet defrosting condition, entering normal defrosting mode when outdoor machine 2 has no frost or little frost, but entering defrosting of air conditioner 1 at this moment is contrary to the desire of user for indoor temperature rise, therefore if outdoor frosting condition is judged only by outdoor heat exchange temperature difference, at compressor 11, the operating frequency F suddenly rises and within a subsequent period of time, the frosting condition of the real outdoor heat exchanger cannot be reflected due to the fact that the outdoor heat exchange temperature difference is increased, whether the defrosting condition is really met or not cannot be accurately judged, frequent defrosting phenomenon occurs, user comfort experience is reduced, and energy consumption is additionally increased.
Therefore, based on the above situation, the embodiment of the present invention proposes a new defrosting control mode, which introduces a preset temperature difference threshold as a defrosting control parameter of the air conditioner 1, where the preset temperature difference threshold is denoted by a, and the preset period is denoted by t. Specifically, the air conditioner 1 sets the temperature T during normal operation Setting up Temperature T of indoor environment Inner ring The temperature difference value Δ T of (a) may also fluctuate slightly for various reasons. When a sudden increase in the temperature difference value Δ T is detected, an increase in the temperature difference value Δ 0T is calculated, wherein the increase in the temperature difference value Δ 1T can be denoted as Δ 2T'. Specifically, the temperature difference value Δ 3T detected last time may be represented as Δ 4T (n-1), the temperature difference value Δ 5T detected this time may be represented as Δ 6T (n), and n is equal to or greater than 1, and an increase value Δ T' ═ Δ T (n) - Δ T (n-1) in the temperature difference value Δ T may be calculated. If the increase value delta T 'of the temperature difference value delta T in the preset period T is detected to meet the condition that the delta T' is more than or equal to A, the temperature difference value delta T is determined to be rapidly increased in a short time, the operating frequency F of the compressor 11 is rapidly increased in a short time to cause fluctuation of an air conditioning system, so that the flow supply of the refrigerant in the short time is insufficient, and the temperature T of the outdoor coil pipe can be caused Outer plate The method has the advantages that the method is fast reduced, the outdoor heat exchange temperature difference is increased suddenly, the situation that defrosting is achieved without frost is avoided due to the fact that the defrosting condition of the conventional defrosting mode is met due to the fact that the outdoor heat exchange temperature difference is increased, in the application, when the fact that the added value delta T 'of the temperature difference value delta T meets the fact that delta T' is larger than or equal to A, the air conditioner 1 can be controlled to enter the false defrosting mode firstly, and then whether the air conditioner 1 needs to be controlled to operate the conventional defrosting mode is further determined. From this, can effectively avoid the phenomenon of frostless and defrosting and frequent defrosting, control more accurately, avoid additionally consuming the energy, guarantee user's experience and feel, satisfy the requirement of user to the comfort level under the operating mode of heating.
If the preset temperature difference threshold a is set to a small value, the air conditioner 1 may frequently enter the false defrosting mode, and control resources may be wasted. Specifically, different preset temperature difference threshold values a can be configured according to the configuration of the air conditioning system and the characteristics of the system. For example, the preset temperature difference threshold may be a value greater than or equal to 1 ℃, and for example, the preset temperature difference threshold a may be a value of 1 ℃ or 2 ℃ or 3 ℃ or 4 ℃.
And, because the duration time of the sudden change of the operating frequency F of the compressor 11 is relatively short, and the time of the air conditioning system in an unstable state is also relatively short, the preset period T for setting and detecting the temperature difference value Δ T is not too long, so as to avoid the situation that the change of the temperature difference value Δ T cannot be detected in time, and specifically, the preset period T can be configured according to the configuration of the air conditioning system and according to the characteristics of the system and the configuration of different preset periods T. For example, the preset period t can be set in a range of 1s ≦ t ≦ 1min, such as the preset period being 1s, or 10s, or 20s, or 30s, or 50s, or 1 min.
In the embodiment, when the air conditioner 1 starts heating operation, after the time that the compressor 11 starts and continuously operates exceeds 20 minutes, the operating frequency F of the compressor 11 is stable, the air conditioning system tends to a stable state, and the acquired data is stable at this time and does not affect the judgment result, that is, after the air conditioning system starts heating operation and continuously operates for a time period not less than 20 minutes, the controller 50 acquires the acquired data again to perform subsequent judgment, so as to ensure the accuracy of the judgment result.
Secondly, in the false defrosting mode, the current operation frequency of the compressor at the initial time of entering the false defrosting mode is recorded as the first frequency F0 and the outdoor heat exchange temperature difference Δ T0 at the initial time, and the air conditioner 1 is controlled to keep heating operation so as not to perform the conventional defrosting mode.
From the above, when the operating frequency F of the compressor increases, the outdoor coil temperature T increases Outer plate If the frosting condition of the outdoor heat exchanger 22 is judged only by the outdoor heat exchange temperature difference, the real frosting condition of the outdoor heat exchanger 22 cannot be reflected, and therefore the controller 50 cannot accurately judge whether the defrosting condition is really achieved. If the outdoor coil temperature T is used at this time Outer plate Reducing the conditions for controlling the air conditioner 1 to enter the normal defrost mode willResulting in a misjudgment, which may cause the air conditioner 1 to still erroneously enter the normal defrost mode. Referring to the line in fig. 4, in the false defrost mode, even if the outdoor coil temperature T is detected 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 1 is controlled not to enter the conventional defrosting mode at the moment and continues to keep the current heating operation, and the indoor environment temperature T caused by mistakenly entering the conventional defrosting mode is avoided Inner ring The situation of influencing the experience of the user is reduced.
It is understood that the specific determination process of the normal defrost mode is as follows: after the compressor 11 is continuously operated for a period of time, the outdoor ambient temperature Tout and the outdoor coil temperature T are collected Outer plate And determining Tout is less than or equal to a first temperature threshold, T Outer plate When the temperature difference of the outdoor heat exchange is not less than the second temperature threshold and not less than the third temperature threshold, entering a conventional defrosting mode, and in the conventional 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, because the outdoor heat exchange temperature difference cannot indicate the frosting condition in the false defrosting mode, the air conditioner 1 may be controlled not to collect the outdoor environment temperature Tout at the beginning of entering the false defrosting mode, or may also be directly assigned to a fixed value of the outdoor environment temperature Tout, and the fixed value is set to be greater than the first temperature threshold, and further, in the false defrosting mode, the outdoor environment temperature Tout is always 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.
Then, when it is determined that the operation frequency remains unchanged for n consecutive preset periods, the current operation frequency of the compressor 11 at the current moment is recorded as the second frequency, where n is greater than 1.
Specifically, after the air conditioner 1 enters the false defrosting mode, when the operating frequency of the compressor 11 changes, the operating frequency is kept stable for a while, if it is determined that the operating frequency of the compressor 11 is not changed within n consecutive preset periods t, that is, if F (n) ═ F (n-1) is detected, it is determined that the operating frequency of the compressor 11 is stable, at this time, the current operating frequency of the compressor 11 at the current time tn is recorded as a second frequency Fn, where the second frequency Fn is the operating frequency of the compressor 11 where the air conditioning system is in an unstable state and is kept stable, and at this time, it is only represented that the operating frequency F of the compressor 11 is stable in a short time, and when the operating frequency F of the compressor 11 is kept unchanged for more than a certain time, it is determined that the operating frequency F of the compressor 11 is finally kept stable, so that when it is determined that the operating frequency is kept unchanged within n consecutive preset periods, i.e. it can be determined that the air conditioning system is in a steady state. For example, if it is determined that the operating frequency remains unchanged for 2 consecutive preset periods, the current operating frequency of the compressor 11 is recorded as the second frequency Fn.
And finally, controlling the air conditioner 1 to continuously maintain the false defrosting mode within a preset time period according to the first frequency F0, the outdoor heat exchange temperature difference and the second frequency Fn, and controlling the air conditioner 1 to exit the false defrosting mode after the preset time period is exceeded.
In an embodiment, considering that the lower the operation frequency of the air conditioning system, the smaller the refrigerant flow rate and the higher the evaporation temperature, the detected outdoor coil temperature T is Outer plate The higher the outdoor heat exchanger 22 is, the less frosted the outdoor heat exchanger 22 is, so that the frequency range of the compressor can be divided according to the maximum allowable operation frequency of the compressor, so that the first frequency F0 before the frequency of the compressor changes and the second frequency Fn after the frequency of the compressor changes and reaches the stable operation can be judged in different frequency ranges to determine the influence of the operation frequency of the compressor 11 on frosting of the outdoor heat exchanger 22 before and after the frequency of the compressor changes; considering that the larger the ambient humidity is, the higher the frosting rate is, the temperature of the outdoor coil pipe is rapidly reduced, and the outdoor heat exchange temperature difference is increased, so that the outdoor heat exchange temperature difference is introduced at the same time, and the reference heat exchange temperature differences corresponding to different frequency ranges are preset when the frequency ranges of the compressors are divided, so that the influence of the humidity environment on the frosting of the outdoor heat exchanger 22 before the frequency of the compressors is changed is indirectly represented according to the comparison result of the outdoor heat exchange temperature difference and the reference heat exchange temperature difference; and, due to compressionAfter the frequency of the operation frequency of the air conditioner 11 is increased, the higher the frequency is, the longer the time period for the air conditioner 1 to reach the steady state after the fluctuation occurs is, therefore, the time period for the air conditioner 1 to use in the process of going to be stable after the fluctuation occurs can be correspondingly set according to the frequency range of the compressor 11 in advance. Therefore, based on the above situation, the air conditioner 1 is controlled to continuously maintain the false defrosting mode within the preset time period when the air conditioner 1 is in the non-steady state condition by judging the first frequency F0, the outdoor heat exchange temperature difference and the second frequency Fn, and the air conditioner 1 is controlled to exit the false defrosting mode after the preset time period is exceeded, that is, after the air conditioning system reaches the steady state, so that the phenomena of defrosting due to frost absence and frequent defrosting can be effectively avoided, the false defrosting mode can be timely exited when the outdoor heat exchanger 22 is frosted really, the normal defrosting judgment can be performed by entering the conventional defrosting mode, and the heat exchange effect of the air conditioner 1 is ensured.
For example, when the outdoor heat exchange temperature difference is greater than or equal to the reference heat exchange temperature difference, it indicates that the environment humidity is high, the frosting rate is high, and the outdoor heat exchanger 22 is prone to frosting, and in this case, the air conditioner 1 exits the false defrosting mode, keeps the heating mode running and performs defrosting determination in the conventional defrosting mode; when the outdoor heat exchange temperature difference is smaller than the reference heat exchange temperature difference, it indicates that the ambient humidity is low, the frosting rate is slow, and there is no frost or little frost on the outdoor heat exchanger 22. Based on the determination of the outdoor heat exchange temperature difference, when the air conditioner 1 is in the low-medium frequency operation, the refrigerant flow is small, the outdoor evaporation temperature is relatively high, the outdoor heat exchanger 22 frosts slowly or even does not frost, and the outdoor heat exchange temperature difference is smaller than the reference heat exchange temperature difference, which means that the outdoor heat exchanger 22 has no frost or very small frost amount and can not enter the defrosting operation, and in addition, if the operation frequency of the compressor 11 is higher, the longer the time required for the air conditioner 1 to fluctuate and tend to stabilize is longer, therefore, when the first frequency F0 and the second frequency Fn are determined to be in the low-medium frequency range in different frequency ranges, the probability of frosting of the outdoor heat exchanger 22 is lower, and if the frequency range of the second frequency Fn after the frequency change of the compressor 11 is higher, the longer the preset time required for controlling the air conditioner 1 to maintain the false defrosting mode is longer, therefore, aiming at the false defrosting phenomenon when the sudden change of the outdoor heat exchange temperature difference caused in the frequency change process of the compressor 11 meets the defrosting condition of entering the conventional defrosting mode, when the air conditioner 1 fluctuates, the air conditioner 1 is controlled to continuously maintain the false defrosting mode within the corresponding preset time length based on the judgment results of the first frequency F0, the outdoor heat exchange temperature difference and the second frequency Fn so as not to perform the conventional defrosting judgment, thereby effectively avoiding the phenomena of defrosting without frost and frequent defrosting, and further after the preset time length is exceeded, the air conditioner 1 reaches a stable state, the air conditioner 1 is controlled to exit the false defrosting mode, so that the false defrosting mode can be timely exited when the outdoor heat exchanger 22 is frosted really, the defrosting operation is performed by entering the conventional defrosting mode, and the heat exchange effect of the air conditioner 1 is ensured.
It should be noted that the air conditioner 1 does not collect the outdoor coil temperature T during the operation frequency change of the compressor 11 after the pseudo defrost mode Outer plate That is, the outdoor ambient temperature is limited not to satisfy the condition for entering the normal defrost mode, and the determination of the normal defrost mode is not performed.
It can be understood that, if the second frequency is greater than the first frequency, the second frequency and the outdoor heat exchange temperature difference are continuously judged; if the second frequency is less than the first frequency, it indicates that the operating frequency of the compressor 11 is not increased, so the air conditioner is controlled to exit the false defrosting mode, enter the normal defrosting mode, and perform the determination of the normal defrosting mode.
According to the air conditioner 1 provided by the embodiment of the invention, a false defrosting mode is provided, and the air conditioner 1 is controlled to enter the false defrosting mode when the temperature difference value between the set temperature and the indoor environment temperature is periodically detected and the increase value of the temperature difference value in the preset period is determined to exceed the preset temperature difference threshold value. The unstable state condition that the temperature difference value changes to cause the sudden rise of the running frequency F of the compressor and further cause the temperature change of the outdoor coil pipe can effectively avoid the phenomena of defrosting due to frost absence and frequent defrosting, and the control is more accurate.
In some embodiments, the controller 50 is further configured to control the air conditioner 1 to continue to maintain the false defrost mode or to exit the false defrost mode according to the first frequency F0, the outdoor heat exchange temperature difference, and the second frequency Fn through frequency ranges divided according to the maximum allowable operating frequency Fmax of the compressor 11, wherein the frequency ranges divided according to the maximum allowable operating frequency Fmax of the compressor 11 are: the first preset frequency F1, the (first preset frequency F1, second preset frequency F2), (second preset frequency F2, third preset frequency F3), (third preset frequency F3, Fmax), and the preset reference heat exchange temperature difference are, for example, a first preset temperature difference Δ Tb1, a second preset temperature difference Δ Tb2, and a third preset temperature difference Δ Tb3, which are specific contents as follows.
If the first frequency F0 is determined to be not higher than the first preset frequency, i.e. F0 is not less than F1, it indicates that the operating frequency of the compressor 11 is in the frequency range of low-frequency operation at the initial time of entering the false defrosting mode, at this time, the outdoor heat exchanger 22 frosts slowly or even does not frost, and it is determined that the outdoor heat exchange temperature difference is lower than the first preset temperature difference, i.e. Δ T0 < [ delta ] Tb1, it indicates that the outdoor heat exchange temperature difference does not satisfy the defrosting condition of the conventional defrosting mode at the initial time of entering the false defrosting mode, i.e. the outdoor heat exchanger 22 has no frost or little frost, and the second frequency Fn is not higher than the first preset frequency, i.e. Fn is not greater than F1, it indicates that the air conditioning system fluctuation caused by the change of the operating frequency F of the compressor 11 tends to be stable after a certain time passes, and the operating frequency of the compressor 11 is still in the frequency range of low-frequency operation after stabilization, therefore, after the first frequency, the outdoor temperature difference heat exchange and the second frequency are determined to satisfy the above-mentioned conditions, when the air conditioner 1 fluctuates, the air conditioner 1 is controlled to continue to maintain the false defrosting mode within the first preset time period t1 to avoid that the outdoor heat exchange temperature difference meets the defrosting condition of entering the conventional defrosting mode due to the frequency change when the air conditioning system is not stable, and avoid the phenomena of defrosting without frost and frequent defrosting, and after the first preset time period t1 is exceeded, that is, after the time period of controlling the air conditioner 1 to maintain the false defrosting mode after tn exceeds the first preset time period t1, the air conditioning system reaches the stable state, and at this time, the air conditioner 1 is controlled to exit the false defrosting mode to enter the conventional defrosting mode so as to perform normal defrosting judgment, and the heat exchange effect of the air conditioner 1 is ensured.
The first preset frequency F1 is divided according to actual conditions based on the highest operating frequency Fmax of the compressor 11, for example, F1 may be set to 30% Fmax. The first preset frequency F1 is a threshold value at which the operating frequency of the compressor 11 is low frequency, and when the current operating frequency of the compressor 11 is lower than the first preset frequency F1, that is, the first frequency is lower than the first preset frequency or the second frequency is lower than the first preset frequency Fn and less than or equal to F1, the operating frequency of the compressor 11 is in the frequency range of low frequency operation.
Or, if it is determined that the first frequency F0 is not higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency Fn is not higher than the second preset frequency and higher than the first preset frequency, the air conditioner 1 is controlled to maintain the false defrosting mode within the second preset time period, and after the second preset time period is exceeded, the air conditioner 1 is controlled to exit the false defrosting mode and enter the conventional defrosting mode.
If the second frequency Fn is not higher than the second preset frequency and is higher than the first preset frequency, that is, F1 is greater than Fn is less than or equal to F2, it indicates that the fluctuation of the air conditioning system caused by the change of the operating frequency F of the compressor 11 tends to be stable after a certain time, and the operating frequency of the compressor 11 after stabilization is in the frequency range of the intermediate frequency operation, in this case, the time required for the air conditioner to reach the steady state is longer than the time required for the air conditioner to reach the steady state when the operating frequency of the compressor is in the low frequency operation, therefore, after determining that the first frequency, the outdoor heat exchange temperature difference and the second frequency meet the above conditions, when the air conditioner 1 fluctuates, the air conditioner 1 is firstly controlled to continuously maintain the false defrosting mode within the second preset time t2, the second preset time t2 is longer than the first preset time t1, so as to avoid that the outdoor defrosting temperature difference meets the heat exchange condition of entering the conventional mode due to the frequency change when the air conditioning system is not stable, the phenomena of defrosting due to frost absence and frequent defrosting are avoided, after the second preset time period t2 is exceeded, namely after the time period for controlling the air conditioner 1 to maintain the false defrosting mode after the tn moment exceeds the second preset time period t2, the air conditioning system reaches a steady state, at the moment, the air conditioner 1 is controlled to exit the false defrosting mode, so that the air conditioner enters the conventional defrosting mode to perform normal defrosting judgment, and the heat exchange effect of the air conditioner 1 is ensured.
The second preset frequency F2 is divided according to actual conditions based on the highest operating frequency Fmax of the compressor 11, for example, F2 may be set to be 50% Fmax. The second preset frequency F2 is a threshold value at which the operating frequency of the compressor 11 is the intermediate frequency, and when the current operating frequency of the compressor 11 is (F1, F2), that is, the first frequency is higher than the first preset frequency and is not higher than the second preset frequency, or the second frequency is higher than the first preset frequency and is not higher than the second preset frequency, the operating frequency of the compressor 11 is in the frequency range of the intermediate frequency operation.
Or, if it is determined that the first frequency F0 is not higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency Fn is not higher than the third preset frequency and higher than the second preset frequency, controlling the air conditioner 1 to maintain the false defrosting mode within a third preset time period, and after the third preset time period is exceeded, controlling the air conditioner 1 to exit the false defrosting mode and enter the conventional defrosting mode.
If the second frequency Fn is not higher than the third preset frequency and is higher than the second preset frequency, that is, F2 < Fn is not more than F3, it indicates that the fluctuation of the air conditioning system caused by the change of the operating frequency F of the compressor 11 tends to be stable after a certain time, and the operating frequency of the compressor 11 after stabilization is in the frequency range of the medium-high frequency operation, in this case, the time required for the air conditioner to reach the steady state is longer than the time required for the air conditioner to reach the steady state when the operating frequency of the compressor is in the medium frequency operation, therefore, after the first frequency, the outdoor heat exchange temperature difference and the second frequency are determined to satisfy the above conditions, when the air conditioner 1 fluctuates, the air conditioner 1 is controlled to continuously maintain the false defrosting mode within the third preset time t3 to avoid the defrosting temperature difference condition that the outdoor heat exchange enters the conventional defrosting mode due to the frequency change when the air conditioning system is unstable, and avoid the phenomena of defrosting without frost and frequent defrosting, and after the third preset time period t3 is exceeded, the third preset time period t3 is longer than the second preset time period t2, that is, after the time tn, the time period for controlling the air conditioner 1 to maintain the false defrosting mode exceeds the third preset time period t3, the air conditioning system reaches a steady state, and at this time, the air conditioner 1 is controlled to exit the false defrosting mode to enter the conventional defrosting mode so as to perform normal defrosting judgment and ensure the heat exchange effect of the air conditioner 1.
The third preset frequency F3 is divided according to the highest operating frequency Fmax of the compressor 11 according to actual conditions, for example, F3 may be set to 70% Fmax. The third preset frequency F3 is a threshold value at which the operating frequency of the compressor 11 is medium-high frequency, that is, when the current operating frequency of the compressor 11 is in the range of (F2, F3), the first frequency F0 is not higher than the third preset frequency and is higher than the second preset frequency, or the second frequency Fn is not higher than the third preset frequency and is higher than the second preset frequency, and the operating frequency of the compressor 11 is in the frequency range of medium-high frequency operation.
Or, if it is determined that the first frequency F0 is not higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency Fn is higher than the third preset frequency, the air conditioner 1 is controlled to maintain the false defrosting mode within a fourth preset time period, and after the fourth preset time period is exceeded, the air conditioner 1 is controlled to exit the false defrosting mode and enter the conventional defrosting mode.
If the second frequency Fn is higher than the third preset frequency, that is, Fn is greater than F3, it indicates that the fluctuation of the air conditioning system caused by the variation of the operating frequency F of the compressor 11 tends to be stable after a certain time, and the operating frequency of the compressor 11 after stabilization is in the frequency range of high-frequency operation, in this case, the time required for the air conditioner to reach the steady state is required to be longer than the time required for the air conditioner to reach the steady state when the operating frequency of the compressor is in the medium-high frequency operation, so after determining that the first frequency, the outdoor heat exchange temperature difference and the second frequency meet the above conditions, when the air conditioner 1 fluctuates, the air conditioner 1 is controlled to continue to maintain the false defrosting mode within a fourth preset time period t4, and the fourth preset time period t4 is longer than the third preset time period t3, so as to avoid that the outdoor heat exchange temperature difference meets the defrosting condition for entering the conventional defrosting mode due to the variation of the frequency when the air conditioning system is not stable, and after the fourth preset time period t4 is exceeded, namely after the time period for controlling the air conditioner 1 to maintain the false defrosting mode after the tn moment exceeds the fourth preset time period t4, the air conditioning system reaches a steady state, and then the air conditioner 1 is controlled to exit the false defrosting mode so as to enter a conventional defrosting mode to perform normal defrosting judgment and ensure the heat exchange effect of the air conditioner 1.
Wherein the first preset frequency is less than the second preset frequency and less than the third preset frequency. If the frequency range of the second frequency Fn after the frequency change of the compressor 11 is higher, the preset time length for the air conditioning system to recover to be stable after the fluctuation is longer, that is, the fourth preset time length t4> the third preset time length t3> the second preset time length t2> the first preset time length t 1.
If the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, that is, F1 < F0 is not less than F2, it indicates that the operating frequency of the compressor 11 is in the frequency range of the intermediate frequency operation at the initial time of entering the false defrosting mode, at this time, the outdoor heat exchanger 22 frosts slowly or even does not frost, and if the outdoor heat exchange temperature difference is determined to be lower than the second preset temperature difference, that is, Δ T0 < Δ Tb2, it indicates that the outdoor heat exchange temperature difference does not satisfy the defrosting condition of the conventional defrosting mode at the initial time of entering the false defrosting mode, that is, the outdoor heat exchanger 22 has no frost or little frost.
On the basis of the above, if it is further determined that the second frequency Fn is not higher than the second preset frequency and is higher than the first preset frequency, that is, F1 < Fn is not more than F2, it indicates that the fluctuation of the air conditioning system caused by the change of the operating frequency F of the compressor 11 tends to be stable after a certain time, and the operating frequency of the compressor 11 is still in the frequency range of the intermediate frequency operation after being stable, so that after the first frequency, the outdoor heat exchange temperature difference and the second frequency are determined to satisfy the above conditions, when the air conditioner 1 fluctuates, the air conditioner 1 is controlled to continue to maintain the false defrosting mode within the fifth preset time period t5 first, so as to avoid the defrosting condition that the outdoor heat exchange temperature difference enters the conventional defrosting mode due to the frequency change when the air conditioning system is not stable, to avoid the phenomena of defrosting without frost and frequent defrosting, and after exceeding the fifth preset time period t5, that after the time period of maintaining the false defrosting mode of the air conditioner 1 exceeds the fifth preset time period t5, and the air conditioning system reaches a steady state, and at the moment, the air conditioner 1 is controlled to exit the false defrosting mode so as to enter a conventional defrosting mode to conveniently carry out normal defrosting judgment and ensure the heat exchange effect of the air conditioner 1.
Or, if it is further determined that the second frequency Fn is not higher than the third preset frequency and is higher than the second preset frequency, that is, F2 < Fn ≦ F3, it indicates that the fluctuation of the air conditioning system caused by the change of the operating frequency F of the compressor 11 has tended to be stable after a certain time, and the operating frequency of the compressor 11 after stabilization is in the frequency range of the medium-high frequency operation, in this case, the time period required for the air conditioner to reach the steady state needs to be longer than the time period required for the air conditioner to reach the steady state when the operating frequency of the compressor is in the medium frequency operation, so when the fluctuation of the air conditioner 1 is determined, the air conditioner 1 is controlled to continue to maintain the false defrosting mode within a sixth preset time period t6 first, so as to avoid that the outdoor heat exchange temperature difference satisfies the defrosting condition of entering the conventional defrosting mode due to the frequency change when the air conditioning system is unstable, the phenomena of defrosting due to frost absence and frequent defrosting are avoided, after the sixth preset time period t6 is exceeded, the sixth preset time period t6 is longer than the fifth preset time period t5, namely after the time of tn, the air conditioner 1 is controlled to maintain the false defrosting mode for a time period exceeding the sixth preset time period t6, the air conditioning system reaches a steady state, and at the moment, the air conditioner 1 is controlled to exit the false defrosting mode to enter a conventional defrosting mode so as to perform normal defrosting judgment and ensure the heat exchange effect of the air conditioner 1.
Or, if it is further determined that the second frequency Fn is higher than the third preset frequency, that is, Fn is greater than F3, it indicates that the fluctuation of the air conditioning system caused by the variation of the operating frequency F of the compressor 11 tends to be stable after a certain time, and the operating frequency of the compressor 11 after stabilization is in the frequency range of the high-frequency operation, in this case, the time required for the air conditioner to reach the steady state needs to be longer than the time required for the air conditioner to reach the steady state when the operating frequency of the compressor is in the medium-high frequency operation, so when it is determined that the first frequency, the outdoor heat exchange temperature difference and the second frequency satisfy the above conditions, the air conditioner 1 is controlled to continue to maintain the false defrosting mode within a seventh preset time t7 when the air conditioner 1 fluctuates, so as to avoid the defrosting condition that the outdoor heat exchange temperature difference satisfies the conventional defrosting mode due to the variation when the air conditioning system is unstable, avoid the phenomena of defrosting without frost and frequent defrosting, and after the seventh preset time period t7 is exceeded, the seventh preset time period t7 is longer than the sixth preset time period t6, that is, after the time tn, the time period for controlling the air conditioner 1 to maintain the false defrosting mode exceeds the seventh preset time period t7, the air conditioning system reaches a steady state, and at this time, the air conditioner 1 is controlled to exit the false defrosting mode so as to enter a conventional defrosting mode to perform normal defrosting judgment, and the heat exchange effect of the air conditioner 1 is ensured.
Wherein, in the environment of the same outdoor environment temperature, the larger the running frequency of the compressor 11 is, the outdoor coil temperature T Outer plate The lower the outdoor heat exchange temperature difference is, the larger the preset temperature difference is, namely the second preset temperature difference is larger than the first preset temperature difference. If the frequency range of the second frequency Fn after the frequency change of the compressor 11 is higher, the preset time length for the air conditioning system to recover to be stable after the fluctuation is longer, that is, the seventh preset time length t7>Sixth preset time period t6>A fifth preset duration t 5.
If the first frequency F0 is determined to be not higher than the third preset frequency and higher than the second preset frequency, that is, F2 < F0 < F3, it indicates that the operating frequency of the compressor 11 is in the frequency range of medium-high frequency operation at the initial time of entering the false defrosting mode, at this time, the outdoor heat exchanger 22 may frost, and if the outdoor heat exchange temperature difference is determined to be lower than the third preset temperature difference, that is, Δ T0 < Δtb3, it indicates that the outdoor heat exchange temperature difference does not satisfy the defrosting condition of the conventional defrosting mode at the initial time of entering the false defrosting mode, that is, the outdoor heat exchanger 22 has no frost or a small amount of frost.
On the basis of the above contents, if it is further determined that the second frequency Fn is not higher than the third preset frequency and is higher than the second preset frequency, that is, F2 < F0 < F3, it indicates that the fluctuation of the air conditioning system caused by the change of the operating frequency F of the compressor 11 tends to be stable after a certain time, and the operating frequency of the compressor 11 is still in the frequency range of the medium-high frequency operation after being stable, so that when it is determined that the first frequency, the outdoor heat exchange temperature difference and the second frequency satisfy the above conditions, and the air conditioner 1 fluctuates, the air conditioner 1 is first controlled to continuously maintain the false defrosting mode within an eighth preset time period t8, so as to avoid the defrosting condition of entering the conventional defrosting mode due to the frequency change when the air conditioning system is unstable, to avoid the phenomena of defrosting without frost and frequent defrosting, and after exceeding an eighth preset time period t8, that after the defrosting time period of the air conditioner 1 exceeding an eighth preset time period t8, and the air conditioning system reaches a steady state, and at the moment, the air conditioner 1 is controlled to exit the false defrosting mode so as to enter a conventional defrosting mode to conveniently carry out normal defrosting judgment and ensure the heat exchange effect of the air conditioner 1.
Or, if it is further determined that the second frequency Fn is higher than the third preset frequency, that is, F0 > F3, it indicates that the air conditioning system has tended to be stable after a certain time elapses since the operating frequency F of the compressor 11 is changed, and the operating frequency of the compressor 11 is in the frequency range of the high-frequency operation after the stabilization, in which case, the time required for the air conditioner to reach the steady state needs to be longer than the time required for the air conditioner to reach the steady state when the operating frequency of the compressor is in the medium-high frequency operation, so when it is determined that the first frequency, the outdoor heat exchange temperature difference, and the second frequency satisfy the above conditions, the air conditioner 1 is first controlled to continuously maintain the false defrosting mode within a ninth preset time period t9 when the air conditioner 1 is fluctuated, so as to avoid the defrosting condition that the outdoor heat exchange temperature difference satisfies the conventional defrosting mode due to the frequency change when the air conditioning system is unstable, and avoid the phenomena of defrosting without frost and frequent defrosting, and after the ninth preset time period t9 is exceeded, the ninth preset time period t9 is longer than the eighth preset time period t8, that is, after the time tn, the time period for controlling the air conditioner 1 to maintain the false defrosting mode exceeds the ninth preset time period t9, the air conditioning system reaches a steady state, and at this time, the air conditioner 1 is controlled to exit the false defrosting mode to enter the conventional defrosting mode so as to perform normal defrosting judgment and ensure the heat exchange effect of the air conditioner 1.
Wherein, in the environment of the same outdoor environment temperature, the larger the running frequency of the compressor 11 is, the outdoor coil temperature T Outer plate The lower the outdoor heat exchange temperature difference is, the larger the preset outdoor heat exchange temperature difference is, namely the third preset temperature difference is larger than the second preset temperature difference. If the frequency range of the second frequency Fn after the frequency change of the compressor 11 is higher, the preset time length for the air conditioning system to recover to the stability after the fluctuation is longer, that is, the ninth preset time length t9>An eighth preset time period t 8.
It should be noted that, when the air conditioner 1 maintains the false defrosting mode, the air conditioner 1 may be set not to collect the outdoor coil temperature T Outer plate The determination of the normal defrosting mode is not made, and the chamber can be always definedThe external ambient temperature Tout does not satisfy the defrosting condition for entering the normal defrosting mode to prevent the normal defrosting mode from being entered by mistake, and when the air conditioner 1 exits the false defrosting mode, the determination for entering the normal defrosting mode is made, and the limitation on the outdoor ambient temperature Tout is cancelled.
When the operating frequency of the compressor 11 is lower, the refrigerant flow rate is smaller, the evaporating temperature is higher, and the detected outdoor coil temperature T is higher Outer plate The higher the outdoor heat exchanger 22, the less prone to frost formation, and thus the duration after the operating frequency of the compressor 11 is stabilized is made different, i.e., the preset time period is made different according to the operating conditions of the air conditioning system, wherein the preset time period can be set by the size of the air conditioning system configuration.
Referring to fig. 5, the control procedure of the false defrost mode is shown, which includes at least steps S1-S5.
Step S1, before the initial time of entering the false defrost mode, which is recorded as T0 and the operation frequency of the compressor changes, the air conditioner may be set to collect the outdoor coil temperature T Outer plate Recording the outdoor heat exchange temperature difference delta T0 at the initial moment, and setting the air conditioner to not collect the outdoor coil temperature T when the running frequency of the compressor changes Outer plate The determination of the normal defrost mode is not entered.
And step S2, dividing the operating frequency of the compressor according to the maximum operating frequency Fmax of the compressor, and respectively recording the operating frequency as F1, F2 and F3.
And step S3, recording the current operation frequency of the compressor as a second frequency Fn, and the time when the operation frequency is stable as tn, if the second frequency is higher than the first frequency, namely Fn is more than F0, and if the outdoor heat exchange temperature difference confirms that the defrosting condition is met, controlling the air conditioner to enter a defrosting preparation period, namely only judging the defrosting condition of the conventional defrosting mode, and not entering the conventional defrosting mode.
Step S4, comparing the frequency divided by F0 and Fn with the frequency divided by F1, F2 and F3, comparing the outdoor heat exchange temperature difference delta T0 with the reference heat exchange temperature difference, determining the preset time length for the air conditioning system to recover to be stable after the fluctuation of the air conditioning system at the tn moment, maintaining the false defrosting mode in the preset time length, and setting that the air conditioner does not acquire the temperature T of the outdoor coil Outer plate And the judgment of the normal defrosting mode is not entered.
Step S5, after the preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode, and the temperature T of the outdoor coil pipe is detected Outer plate And entering a normal defrosting mode.
In some embodiments, the controller 50 is further configured to: and acquiring the rotating speed of the indoor fan 31, determining that the increasing value of the rotating speed of the indoor fan 31 exceeds a preset rotating speed value in a preset period, and controlling the air conditioner 1 to enter a false defrosting mode.
Specifically, when the operating frequency F of the compressor 11 suddenly increases, the air conditioning system inevitably fluctuates, and the parameter representing the fluctuation of the air conditioning system is the indoor coil temperature T Inner disc Outdoor coil temperature T Outer plate And the exhaust temperature. The degree of influence on the above parameters when the operating frequency F of the compressor 11 suddenly changes can be described with reference to 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
Rotation speed of indoor fan ★★★★ ★ ★★★
Operating frequency of compressor ★★★★ ★★★★★ ★★★★★
Specifically, when the rotating speed of the indoor fan 31 changes suddenly, the fluctuation of the air conditioning system may also occur, for example, when the heating demand of the user increases, the heating demand may also be satisfied by controlling and increasing the rotating speed of the indoor fan 31. When the user controls the air conditioner 1 to increase the air output or changes from the sleep or mute mode to the heating mode, the rotation speed of the indoor fan 31 is correspondingly increased. And the parameter for representing the fluctuation of the air conditioning system by increasing the rotating speed of the indoor fan 31 is the indoor coil temperature T Inner disc Outdoor coil temperature T Outer plate And exhaust temperature, etc. Wherein, the influence degree of the sudden change of the rotating speed of the indoor fan 31 on the above parameters can be described by combining table 1, and as can be seen from table 1, the sudden change of the rotating speed of the indoor fan 31 on the outdoor coil temperature T Outer plate Therefore, the conditions of defrosting due to frostless condition and frequent defrosting which may occur in the air conditioner 1 in an unsteady state are controlled based on the rotating speed of the indoor fan 31, so that the user experience can be improved, and energy consumption can be prevented.
Based on the above situation, the present invention may also introduce a preset rotation speed value as a control parameter for defrosting the air conditioner 1, for example, the preset rotation speed threshold value may be denoted as N0, and it is understood that, when the air conditioner 1 is in normal operation, the rotation speed N of the indoor fan 31 may fluctuate slightly due to various reasons. When the sudden increase of the rotation speed N of the indoor fan 31 is detected, the increase of the rotation speed N of the indoor fan 31 needs to be calculated, where the increase of the rotation speed N of the indoor fan 31 may be denoted as Δ N, the rotation speed N of the indoor fan 31 detected last time is denoted as N (N-1), the rotation speed N of the indoor fan 31 detected this time is denoted as N (N), and N is greater than or equal to 1, and then the increase of the rotation speed N Δ N is calculated as N (N) -N (N-1). If it is detected that the increased value Δ N of the rotation speed N of the indoor fan 31 in the preset period t satisfies that Δ N is not less than N0, it is determined that the rotation speed N of the indoor fan 31 is rapidly increased in a short time, which causes fluctuation of the air conditioning system, and therefore, in order to prevent the situation of defrosting due to frost, when it is detected that the increased value Δ N of the rotation speed N of the indoor fan 31 satisfies that Δ N is not less than N0, the air conditioner 1 may be controlled to enter a false defrosting mode, and then it is further determined whether the air conditioner 1 needs to be controlled to operate in a conventional defrosting mode. From this, can effectively avoid the phenomenon of frostless and defrosting and frequent defrosting, control more accurately, avoid additionally consuming the energy, guarantee user's experience and feel, satisfy the requirement of user to the comfort level under the operating mode of heating.
The preset rotation speed value N0 is a rotation speed value preset according to an experiment, and if the preset rotation speed threshold value N0 is set to a smaller value, the air conditioner 1 frequently enters a false defrosting mode, and control resources are wasted, so that the value range of the preset rotation speed value N0 may be set to N0 not less than 50r/min, for example, the preset rotation speed value N0 may be 50r/min, 60r/min, 70r/min, and the like.
Referring to fig. 6, the process of entering the false defrost mode of the air conditioner according to the embodiment of the present invention is illustrated, and the method includes at least steps S6 to S9.
In step S6, the air conditioner is in heating operation.
Step S7, judging whether the increase value of the temperature difference value in the preset period exceeds the preset temperature difference threshold value, namely whether the increase value of the temperature difference value in the preset period exceeds a preset temperature difference threshold value, namely whether the increase value of the rotating speed of the fan in the preset period exceeds a preset rotating speed value, namely N (N) -N (N-1) is more than or equal to N0, if yes, executing step S8, otherwise executing step S9.
And step S8, controlling the air conditioner to enter a false defrosting mode.
In step S9, the air conditioner is controlled to maintain the heating operation, and the process returns to step S6.
That is, the indoor ambient temperature T Inner ring And a set temperature T Setting up The increase of the temperature difference value delta T or the increase of the rotating speed delta N of the indoor fan 31 can cause the operating frequency F of the compressor 11 to be rapidly increased, the fluctuation of the air conditioning system is caused, and the temperature T of the outdoor coil pipe is further caused Outer plate Quickly reduced, thereby possibly causing the temperature difference of outdoor heat exchange to meet the requirement of a defrosting stripIn order to avoid the phenomenon that the outdoor frosting condition is judged only by the outdoor heat exchange temperature difference to cause false defrosting and frequent defrosting of the air conditioner 1, the increasing value delta T' of the temperature difference value in the preset period exceeds the preset temperature difference threshold value, or when the increasing value delta N of the rotating speed of the fan 31 in the preset period exceeds the preset rotating speed value, the air conditioner 1 is controlled to enter the false defrosting mode firstly, and then whether the air conditioner 1 needs to be controlled to operate the conventional defrosting mode is further determined, from this, can effectively avoid the phenomenon of frostless and defrosting and frequent defrosting, control more accurately, avoid additionally consuming the energy, guarantee user's experience and feel, satisfy the requirement of user to the comfort level under the operating mode of heating.
In a second embodiment of the present invention, a defrosting control method for an air conditioner is provided, as shown in fig. 7, the method at least includes steps S10 to S13.
And step S10, when the air conditioner is in heating operation, acquiring the temperature difference value between the set temperature and the indoor environment temperature, determining that the increase value of the temperature difference value in the preset period exceeds the preset temperature difference threshold value, and controlling the air conditioner to enter a false defrosting mode.
For example, the operating frequency of the compressor is increased due to the change of the setting mode by the user or the change of the ambient temperature of the user, and the insufficient supply of the refrigerant occurs in the outdoor heat exchanger for a short time, which causes the rapid decrease of the evaporating pressure, i.e. the outdoor coil temperature T Outer plate The temperature of the outdoor heat exchanger is increased suddenly and in a subsequent period of time, the outdoor heat exchange temperature difference is increased suddenly, the real frosting condition of the outdoor heat exchanger cannot be reflected, and the frosting condition of the outdoor heat exchanger cannot be reflected and cannot be reflectedWhether the defrosting condition is really met or not is accurately judged, frequent defrosting occurs, the comfort experience of a user is reduced, and energy consumption is additionally increased.
Therefore, based on the above situation, the embodiment of the present invention proposes a new defrosting control mode, in which a preset temperature difference threshold is introduced as a control parameter for defrosting the air conditioner, where the preset temperature difference threshold is denoted by a, and a preset period is denoted by t. Specifically, the air conditioner sets the temperature T during normal operation Setting up Temperature T of indoor environment Inner ring The temperature difference value Δ T of (a) may also fluctuate slightly for various reasons. When a sudden increase in the temperature difference value Δ T is detected, an increase in the temperature difference value Δ 0T is calculated, where the increase in the temperature difference value Δ 1T can be denoted as Δ 2T'. Specifically, the temperature difference value Δ 3T detected last time may be represented as Δ 4T (n-1), the temperature difference value Δ 5T detected this time may be represented as Δ 6T (n), and n is equal to or greater than 1, and an increase value Δ T' ═ Δ T (n) - Δ T (n-1) in the temperature difference value Δ T may be calculated. If the fact that the increase value delta T 'of the temperature difference value delta T in the preset period T meets the condition that delta T' is larger than or equal to A is detected, the fact that the temperature difference value delta T is rapidly increased in a short time is determined, the operation frequency F of a compressor is rapidly increased in the short time to cause fluctuation of an air conditioning system, the flow supply of a refrigerant in the short time is insufficient, and the temperature T of an outdoor coil pipe can be caused Outer plate The method has the advantages that the method is fast reduced, the outdoor heat exchange temperature difference is increased suddenly, the situation that defrosting is achieved without frost is avoided due to the fact that the defrosting condition of the conventional defrosting mode is met due to the fact that the outdoor heat exchange temperature difference is increased, in the application, when the fact that the added value delta T 'of the temperature difference value delta T meets the fact that delta T' is larger than or equal to A, the air conditioner can be controlled to enter the false defrosting mode firstly, and then whether the air conditioner needs to be controlled to operate the conventional defrosting mode is further determined. From this, can effectively avoid the phenomenon of frostless and defrosting and frequent defrosting, control more accurately, avoid additionally consuming the energy, guarantee user's experience and feel, satisfy the requirement of user to the comfort level under the operating mode of heating.
And step S11, in the false defrosting mode, recording the current operating frequency of the compressor as the first frequency F0 and the outdoor heat exchange temperature difference at the initial moment of entering the false defrosting mode, and controlling the air conditioner to keep heating operation so as not to carry out the conventional defrosting mode.
From the above, when the operating frequency F of the compressor increases, the outdoor coil temperature T increases Outer plate The defrosting condition of the outdoor heat exchanger can not be reflected if the frosting condition of the outdoor heat exchanger is judged only through the outdoor heat exchange temperature difference, so that the controller cannot accurately judge whether the defrosting condition is really met. 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 normal defrost mode may cause a misjudgment, which may cause the air conditioner to still mistakenly enter the normal defrost mode. Referring to the line in fig. 4, in the false defrost mode, even if the outdoor coil temperature T is detected 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, at the moment, the air conditioner is controlled not to enter the conventional defrosting mode and the current heating operation is continuously kept, so that the indoor environment temperature T caused by mistakenly entering the conventional defrosting mode is avoided Inner ring The situation of influencing the experience of the user is reduced.
It is understood that the specific determination process of the normal defrost mode is as follows: when the compressor is continuously operated for a period of time, the outdoor ambient temperature Tout and the outdoor coil temperature T are collected Outer plate And determining Tout is less than or equal to a first temperature threshold, T Outer plate When the temperature difference between the outdoor heat exchange and the first temperature is less than or equal to a second temperature threshold and the temperature difference between the outdoor heat exchange and the second temperature is greater than or equal to a third temperature threshold, entering a conventional defrosting mode, and in the conventional 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. Wherein the outdoor ambient temperature Tout is collected by the outdoor ambient temperature sensor 27.
Based on the above, because the outdoor heat exchange temperature difference cannot indicate the frosting condition in the false defrosting mode, the air conditioner may be controlled not to collect the outdoor environment temperature Tout at the beginning of entering the false defrosting mode, or may also be directly assigned to a fixed value for the outdoor environment temperature Tout, and the fixed value is set to be greater than the first temperature threshold, so that in the false defrosting mode, the outdoor environment temperature Tout is always limited not to satisfy the condition of entering the conventional defrosting mode, so as to prevent the conventional defrosting mode from being entered by mistake.
And step S12, when the operation frequency is determined to be kept unchanged in n continuous preset periods, recording the current operation frequency of the compressor at the current moment as a second frequency Fn, wherein n is greater than 1.
Specifically, after the air conditioner enters the false defrosting mode, after the operating frequency of the compressor changes, the operating frequency of the compressor is kept stable for a period of time, if it is determined that the operating frequency of the compressor is not changed within n consecutive preset periods t, that is, if F (n) ═ F (n-1) is detected, it is determined that the operating frequency of the compressor is stable, at this time, the current operating frequency of the compressor at the current time tn is recorded as a second frequency Fn, wherein the second frequency Fn is the operating frequency of the compressor which is kept stable under the unstable state of the air conditioning system, and only represents that the operating frequency F of the inner compressor is stable in a short time, and when the operating frequency F of the compressor is kept unchanged for more than a certain time, it can be determined that the operating frequency F of the compressor is finally kept stable, so that when it is determined that the operating frequency is kept unchanged within n consecutive preset periods, i.e. it can be determined that the air conditioning system is in a steady state. For example, if it is determined that the operating frequency remains unchanged for 2 consecutive preset periods, the current operating frequency of the compressor is recorded as the second frequency Fn.
And step S13, controlling the air conditioner to continuously maintain the false defrosting mode within a preset time according to the first frequency, the outdoor heat exchange temperature difference and the second frequency, and controlling the air conditioner to exit the false defrosting mode after the preset time is exceeded.
In the embodiment, considering that the lower the operation frequency of the air conditioning system, the smaller the refrigerant flow and the higher the evaporation temperature, the higher the detected temperature of the outdoor coil pipe is, the more difficult the outdoor heat exchanger is to frost, the frequency range of the compressor can be divided according to the highest allowable operation frequency of the compressor, so that the first frequency F0 before the frequency of the compressor changes and the second frequency Fn after the frequency of the compressor changes and reaches the stable operation are judged in different frequency ranges to determine the influence of the operation frequency of the compressor on the frosting of the outdoor heat exchanger before and after the frequency of the compressor changes; considering that the larger the environment humidity is, the higher the frosting rate is, the quick reduction of the outdoor coil temperature is and the increase of the outdoor heat exchange temperature difference, the outdoor heat exchange temperature difference is introduced at the same time, and the reference heat exchange temperature difference corresponding to different frequency ranges is preset when the frequency ranges of the compressors are divided, so that the influence of the humidity environment on the frosting of the outdoor heat exchanger before the frequency of the compressors is changed is indirectly represented according to the comparison result of the outdoor heat exchange temperature difference and the reference heat exchange temperature difference; and because the higher the frequency of the operation of the compressor is after the frequency is increased, the longer the time length of the air conditioner reaching the steady state after the fluctuation occurs is, therefore, the time length of the air conditioner used in the process of trend to be stable after the fluctuation occurs can be correspondingly set according to the frequency range of the compressor in advance. Therefore, based on the above situation, the air conditioner is controlled to continuously maintain the false defrosting mode within the preset time period under the unstable state condition of the air conditioner by judging the first frequency F0, the outdoor heat exchange temperature difference and the second frequency Fn, and the air conditioner is controlled to exit the false defrosting mode after the preset time period is exceeded, namely the air conditioning system reaches the stable state, so that the phenomena of defrosting without frost and frequent defrosting can be effectively avoided, the false defrosting mode can be timely exited when the outdoor heat exchanger is frosted really, the normal defrosting judgment can be performed by entering the conventional defrosting mode, and the heat exchange effect of the air conditioner is ensured.
For example, when the outdoor heat exchange temperature difference is greater than or equal to the reference heat exchange temperature difference, the environment humidity is high, the frosting rate is high, and the outdoor heat exchanger is easy to frost; when the outdoor heat exchange temperature difference is less than the reference heat exchange temperature difference, the environment humidity is small, the frosting rate is slow, and the outdoor heat exchanger has no frost or little frost. On the basis of the judgment of the outdoor heat exchange temperature difference, when the air conditioner operates at the medium and low frequency, the refrigerant flow is small, the outdoor evaporation temperature is relatively high, the outdoor heat exchanger frosts slowly or even does not frost, and the higher the operating frequency of the compressor is, the longer the time required by the air conditioner to fluctuate and tend to be stable is, so when the first frequency F0 and the second frequency Fn are judged to be both at the medium and low frequency in different frequency ranges, the probability of frosting of the outdoor heat exchanger is lower, and if the frequency range of the second frequency Fn after the frequency change of the compressor is higher, the longer the preset time required by controlling the air conditioner to maintain the false defrosting mode is, so the false defrosting phenomenon when the outdoor heat exchange temperature difference mutation caused in the frequency change process of the compressor meets the defrosting condition of entering the conventional defrosting mode is solved, when the air conditioner fluctuates, based on the judgment results of the first frequency F0, the outdoor heat exchange temperature difference and the second frequency Fn, the air conditioner is controlled to continuously maintain the false defrosting mode within the corresponding preset time, so that the conventional defrosting judgment is not carried out, the phenomena of defrosting without frost and frequent defrosting are effectively avoided, further, after the preset time is exceeded, the air conditioner reaches a stable state, the air conditioner is controlled to exit the false defrosting mode, so that the false defrosting mode can be timely exited when the outdoor heat exchanger is frosted really, the defrosting operation is carried out by entering the conventional defrosting mode, and the heat exchange effect of the air conditioner is ensured.
It should be noted that, after the air conditioner is in the false defrosting mode, during the operation frequency change of the compressor, the temperature of the outdoor coil is not collected, that is, the outdoor environment temperature is limited not to meet the condition of entering the conventional defrosting mode, and the determination of the conventional defrosting mode is not performed.
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 temperature difference value between the set temperature and the indoor environment temperature is periodically detected and the increase value of the temperature difference value in the preset period is determined to exceed the preset temperature difference threshold. Under the unsteady state that the temperature difference value changes to cause the sudden rise of the running frequency of the compressor and further cause the temperature change of the outdoor coil, the phenomena of defrosting due to frost absence and frequent defrosting can be effectively avoided, and the control is more accurate.
In some embodiments of the present invention, as shown in fig. 8, which is a flowchart of an air conditioner defrosting control method according to another embodiment of the present invention, the air conditioner defrosting control method further includes steps S14-S25, as follows.
In step S14, the false defrost mode is entered to the frequency range of the first frequency F0 at the initial time t 0.
In step S15, it is determined that the first frequency F0 is not higher than the first preset frequency F1, i.e., F0 ≦ F1.
And step S16, determining that the outdoor heat exchange temperature difference at the initial moment is lower than a first preset temperature difference, namely delta T0 < deltaTb 1.
In step S17, the frequency range of the second frequency Fn is determined, and step S18, step S20, step S22, or step S24 is performed.
In step S18, when the second frequency Fn is not higher than the first preset frequency F1, that is, Fn is less than or equal to F1.
And step S19, controlling the air conditioner to maintain the false defrosting mode within a first preset time period t1, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the first preset time period t1 is exceeded.
In step S20, when the second frequency Fn is not higher than the second predetermined frequency F2 and higher than the first predetermined frequency F1, F1 < Fn ≦ F2.
And step S21, controlling the air conditioner to maintain the false defrosting mode within a second preset time period t2, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the second preset time period t2 is exceeded.
In step S22, when the second frequency Fn is not higher than the third predetermined frequency F3 and is higher than the second predetermined frequency F2, i.e. F2 < Fn ≦ F3.
And step S23, controlling the air conditioner to maintain the false defrosting mode within a third preset time period t3, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the third preset time period t3 is exceeded.
In step S24, when the second frequency Fn is higher than the third preset frequency F3, that is, Fn > F3.
And step S25, controlling the air conditioner to maintain the false defrosting mode within a fourth preset time period t4, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the fourth preset time period t4 is exceeded.
In some embodiments of the present invention, as shown in fig. 9, which is a flowchart of an air conditioner defrosting control method according to another embodiment of the present invention, the air conditioner defrosting control method further includes steps S26-S35, as follows.
In step S26, the frequency range where the first frequency F0 is located at the initial time t0 of the false defrost mode is entered.
In step S27, it is determined that the first frequency F0 is not higher than the second preset frequency and higher than the first preset frequency F1, i.e., F1 < F0 ≦ F2.
And step S28, determining that the outdoor heat exchange temperature difference at the initial moment is lower than a second preset temperature difference, namely delta T0 < deltaTb 2.
In step S29, the frequency range of the second frequency Fn is determined, and step S30, step S32 or step S34 is performed.
In step S30, it is determined that the second frequency Fn is not higher than the second predetermined frequency F2 and higher than the first predetermined frequency F1, i.e. F1 < Fn ≦ F2.
And step S31, controlling the air conditioner to maintain the false defrosting mode within a fifth preset time period t5, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the fifth preset time period t5 is exceeded.
In step S32, it is determined that the second frequency Fn is not higher than the third predetermined frequency F3 and higher than the second predetermined frequency F2, i.e., F2 < Fn ≦ F3.
And step S33, controlling the air conditioner to maintain the false defrosting mode within a sixth preset time period t6, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the sixth preset time period t6 is exceeded.
In step S34, it is determined that the second frequency Fn is higher than the third preset frequency F3, i.e., Fn > F3.
And step S35, controlling the air conditioner to maintain the false defrosting mode within a seventh preset time period t7, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the seventh preset time period t7 is exceeded.
In some embodiments of the present invention, as shown in fig. 10, which is a flowchart of an air conditioner defrosting control method according to another embodiment of the present invention, the air conditioner defrosting control method further includes steps S36-S43, as follows.
In step S36, the frequency range of the first frequency F0 at the initial time t0 of the false defrost mode is entered.
In step S37, it is determined that the first frequency F0 is not higher than the third preset frequency F3 and is higher than the second preset frequency F2, i.e., F2 < F0 ≦ F3.
And step S38, determining that the outdoor heat exchange temperature difference at the initial moment is lower than a third preset temperature difference, namely delta T0 < deltaTb 3.
In step S39, the frequency range of the second frequency Fn is determined.
In step S40, when the second frequency Fn is not higher than the third predetermined frequency F3 and is higher than the second predetermined frequency F2, F2 < Fn ≦ F3.
And step S41, controlling the air conditioner to maintain the false defrosting mode within an eighth preset time period t8, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the eighth preset time period t8 is exceeded.
In step S42, when the second frequency Fn is higher than the third preset frequency F3, Fn > F3.
And step S43, controlling the air conditioner to maintain the false defrosting mode within a ninth preset time period t9, and controlling the air conditioner to exit the false defrosting mode and enter the conventional defrosting mode after the ninth preset time period t9 is exceeded.
In an embodiment, as shown in fig. 11, a flowchart of a defrosting control method of an air conditioner according to another embodiment of the present invention includes at least steps S44 to S46.
And step S44, acquiring the rotating speed of the indoor fan when the air conditioner is in heating operation.
And step S45, determining that the increase value of the rotating speed of the indoor fan in the preset period exceeds the preset rotating speed value.
And step S46, controlling the air conditioner to enter a false defrosting mode.
Specifically, when the rotating speed of the indoor fan changes suddenly, the fluctuation of the air conditioning system may also be caused, for example, when the heating demand of the user increases, the heating demand may also be satisfied by controlling and increasing the rotating speed of the indoor fan. When the user controls the air conditioner to increase the air output or the air conditioner is switched from the sleep or mute mode to the heating mode, the rotating speed of the indoor fan can be correspondingly increased. The parameter for improving the rotating speed of the indoor fan to represent the fluctuation of the air conditioning system is the temperature T of the indoor coil pipe Inner disc Outdoor coil temperature T Outer plate And exhaust temperature, etc. Wherein, can describe the influence degree to the above-mentioned parameter when the rotational speed of the indoor blower changes suddenly with table 1, can know from table 1 that the sudden change of the rotational speed of the indoor blower changes the outdoor coil temperature T Outer plate The influence of (2) is very big, therefore, the condition of defrosting and frequent defrosting that probably appears under the unsteady state to the air conditioner is controlled based on the rotational speed of indoor fan, can promote user experience and feel, prevents to consume the energy.
In the above situation, the present invention may also introduce a preset rotation speed value as a control parameter for defrosting the air conditioner, for example, the preset rotation speed threshold value may be denoted as N0, and it is understood that, when the air conditioner is in normal operation, the rotation speed N of the indoor fan may fluctuate slightly due to various reasons. When the rotating speed N of the indoor fan is detected to be suddenly increased, the increasing value of the rotating speed N of the indoor fan needs to be calculated, wherein the increasing value of the rotating speed N of the indoor fan can be recorded as delta N, the rotating speed N of the indoor fan detected last time is recorded as N (N-1), the rotating speed N of the indoor fan detected this time is recorded as N (N), and N is larger than or equal to 1, and then the increasing value of the rotating speed N delta N is calculated as N (N) -N (N-1). If the fact that the increased value delta N of the rotating speed N of the indoor fan in the preset period t meets the condition that the delta N is not less than N0 is detected, the fact that the rotating speed N of the indoor fan is rapidly increased in a short time to cause fluctuation of an air conditioning system is determined, therefore, in order to prevent the situation of defrosting due to frost, when the fact that the increased value delta N of the rotating speed N of the indoor fan meets the condition that the delta N is not less than N0 is detected, the air conditioner can be controlled to enter a false defrosting mode, and then whether the air conditioner needs to be controlled to operate in a conventional defrosting mode or not is further determined. From this, can effectively avoid the phenomenon of frostless and defrosting and frequent defrosting, control more accurately, avoid additionally consuming the energy, guarantee user's experience and feel, satisfy the requirement of user to the comfort level under the operating mode of heating.
In summary, according to the air conditioner and the defrosting control method of the air conditioner provided by the embodiment of the invention, the temperature T of the indoor coil can be controlled Inner disc The first frequency F0, the outdoor heat exchange temperature difference, the second frequency Fn and the like are used as parameters for controlling the normal defrosting mode, the rotating speed N of the indoor fan is introduced, and the compressor is operatedOutdoor coil temperature T caused by sudden height of line frequency Outer plate The control method has the advantages that the control is more accurate, extra energy consumption is avoided, and the comfort experience of a user is improved.
Other configurations and operations of the air conditioner and the like according to the embodiments 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 (12)

1. An air conditioner, comprising:
a compressor;
the first temperature sensor is used for collecting the indoor environment temperature;
a controller connected to the compressor and the first temperature sensor, respectively, the controller configured to:
when the air conditioner is in heating operation, acquiring a temperature difference value between a set temperature and an indoor environment temperature, determining that the increase value of the temperature difference value in a preset period exceeds a preset temperature difference threshold value, and controlling the air conditioner to enter a false defrosting mode;
under the false defrosting mode, recording the current operation frequency of the compressor as a first frequency and the outdoor heat exchange temperature difference at the initial moment of entering the false defrosting mode, and controlling the air conditioner to keep heating operation so as not to carry out a conventional defrosting mode;
when the operation frequency is determined to be kept unchanged in n continuous preset periods, recording the current operation frequency of the compressor at the current moment as a second frequency, wherein n is greater than 1;
and controlling the air conditioner to continuously maintain the false defrosting mode within a preset time according to the first frequency, the outdoor heat exchange temperature difference and the second frequency, and controlling the air conditioner to exit the false defrosting mode after the preset time is exceeded.
2. The air conditioner of claim 1, wherein the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode based on the first frequency, the outdoor heat exchange delta t, and the second frequency, is further configured to:
when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is determined to be lower than a first preset temperature difference, and the second frequency is determined to be not higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a first preset time period, and after the first preset time period is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be not higher than a second preset frequency and higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a second preset time, and after the second preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be not higher than a third preset frequency and higher than a second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a third preset time, and after the third preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be higher than a third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a fourth preset time, and after the fourth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
the first preset frequency is less than the second preset frequency and less than the third preset frequency, and the fourth preset time is greater than the third preset time and greater than the second preset time and greater than the first preset time.
3. The air conditioner of claim 2, wherein the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode based on the first frequency, the outdoor heat exchange delta t, and the second frequency, is further configured to:
when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than a second preset temperature difference, and the second frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a fifth preset time, and after the fifth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the second preset temperature difference, and the second frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a sixth preset time, and after the sixth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the second preset temperature difference, and the second frequency is determined to be higher than the third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a seventh preset time, and after the seventh preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
the second preset temperature difference is larger than the first preset temperature difference, and the seventh preset time is larger than the sixth preset time and larger than the fifth preset time.
4. The air conditioner of claim 2, wherein the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode based on the first frequency, the outdoor heat exchange delta t, and the second frequency, is further configured to:
when the first frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the outdoor heat exchange temperature difference is lower than a third preset temperature difference, and the second frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within an eighth preset time, and after the eighth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the outdoor heat exchange temperature difference is lower than a third preset temperature difference, and the second frequency is determined to be higher than the third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a ninth preset time, and after the ninth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
and the third preset temperature difference is greater than the second preset temperature difference, and the ninth preset time is greater than the eighth preset time.
5. The air conditioner of claim 1, wherein the controller is further configured to:
and acquiring the rotating speed of an indoor fan, determining that the increasing value of the rotating speed of the indoor fan in the preset period exceeds a preset rotating speed value, and controlling the air conditioner to enter the false defrosting mode.
6. The air conditioner of any one of claims 1-5, wherein the controller is further configured to:
in the false defrost mode, defining that the outdoor ambient temperature does not satisfy a condition for entering the normal defrost mode;
after entering the normal defrost mode, the limitation of the outdoor ambient temperature is removed.
7. A defrosting control method of an air conditioner is characterized by comprising the following steps:
when the air conditioner is in heating operation, acquiring a temperature difference value between a set temperature and an indoor environment temperature, determining that the increase value of the temperature difference value in a preset period exceeds a preset temperature difference threshold value, and controlling the air conditioner to enter a false defrosting mode;
under the false defrosting mode, recording the current operation frequency of the compressor as a first frequency and the outdoor heat exchange temperature difference at the initial moment of entering the false defrosting mode, and controlling the air conditioner to keep heating operation so as not to carry out a conventional defrosting mode;
when the operation frequency is determined to be kept unchanged in n continuous preset periods, recording the current operation frequency of the compressor at the current moment as a second frequency, wherein n is greater than 1;
and controlling the air conditioner to continuously maintain the false defrosting mode within a preset time according to the first frequency, the outdoor heat exchange temperature difference and the second frequency, and controlling the air conditioner to exit the false defrosting mode after the preset time is exceeded.
8. The air conditioner defrosting control method of claim 7, wherein the controller, when controlling the air conditioner to continue to maintain the false defrosting mode or to exit the false defrosting mode according to the first frequency, the outdoor heat exchange temperature difference, and the second frequency, further comprises:
when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than a first preset temperature difference, and the second frequency is determined to be not higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a first preset time period, and after the first preset time period is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be not higher than a second preset frequency and higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a second preset time, and after the second preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be not higher than a third preset frequency and higher than a second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a third preset time, and after the third preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than a first preset frequency, the outdoor heat exchange temperature difference is lower than the first preset temperature difference, and the second frequency is determined to be higher than a third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a fourth preset time, and after the fourth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
the first preset frequency is less than the second preset frequency and less than the third preset frequency, and the fourth preset time is greater than the third preset time and greater than the second preset time and greater than the first preset time.
9. The air conditioner defrosting control method of claim 8, wherein the controller, when controlling the air conditioner to continue to maintain the false defrost mode or to exit the false defrost mode according to the first frequency, the outdoor heat exchange temperature difference, and the second frequency, further comprises:
when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than a second preset temperature difference, and the second frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a fifth preset time, and after the fifth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the second preset temperature difference, and the second frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a sixth preset time, and after the sixth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than the second preset frequency and higher than the first preset frequency, the outdoor heat exchange temperature difference is lower than the second preset temperature difference, and the second frequency is determined to be higher than the third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a seventh preset time, and after the seventh preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
the second preset temperature difference is larger than the first preset temperature difference, and the seventh preset time is larger than the sixth preset time and larger than the fifth preset time.
10. The air conditioner defrosting control method of claim 9, wherein the controller, when controlling the air conditioner to continue to maintain the false defrosting mode or to exit the false defrosting mode according to the first frequency, the outdoor heat exchange temperature difference, and the second frequency, further comprises:
when the first frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the outdoor heat exchange temperature difference is lower than a third preset temperature difference, and the second frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the air conditioner is controlled to maintain the false defrosting mode within an eighth preset time, and after the eighth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
when the first frequency is determined to be not higher than the third preset frequency and higher than the second preset frequency, the outdoor heat exchange temperature difference is lower than a third preset temperature difference, and the second frequency is determined to be higher than the third preset frequency, the air conditioner is controlled to maintain the false defrosting mode within a ninth preset time, and after the ninth preset time is exceeded, the air conditioner is controlled to exit the false defrosting mode and enter a conventional defrosting mode;
the third preset temperature difference is larger than the second preset temperature difference, and the ninth preset time length is larger than the eighth preset time length.
11. The air conditioner defrost control method of claim 10, further comprising:
and acquiring the rotating speed of an indoor fan, determining that the increasing value of the rotating speed of the indoor fan in the preset period exceeds a preset rotating speed value, and controlling the air conditioner to enter the false defrosting mode.
12. The air conditioner defrost control method of any one of claims 7-11, further comprising:
in the false defrost mode, defining that the outdoor ambient temperature does not satisfy a condition for entering the normal defrost mode;
after entering the normal defrost mode, the limitation of the outdoor ambient temperature is removed.
CN202210760685.4A 2022-06-30 2022-06-30 Air conditioner and defrosting control method thereof Active CN115031351B (en)

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PCT/CN2023/085882 WO2024001373A1 (en) 2022-06-30 2023-04-03 Air conditioner and defrosting control method therefor

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CN115451528A (en) * 2022-09-26 2022-12-09 宁波奥克斯电气股份有限公司 Defrosting control method, control device and air conditioner heat exchange system

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