CN114110954B - Self-cleaning control method for outdoor heat exchanger, air conditioner and computer storage medium - Google Patents

Self-cleaning control method for outdoor heat exchanger, air conditioner and computer storage medium Download PDF

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CN114110954B
CN114110954B CN202111433283.5A CN202111433283A CN114110954B CN 114110954 B CN114110954 B CN 114110954B CN 202111433283 A CN202111433283 A CN 202111433283A CN 114110954 B CN114110954 B CN 114110954B
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temperature
self
controlling
cleaning
outdoor
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CN114110954A (en
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王军
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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    • 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
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F2110/12—Temperature of the outside air
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a self-cleaning control method of an outdoor heat exchanger, an air conditioner and a computer storage medium. The self-cleaning control method of the outdoor heat exchanger comprises the following steps: responding to the self-cleaning instruction, and controlling the outdoor motor to reversely run; detecting that the outdoor motor meets a pre-cleaning condition, and controlling the outdoor motor to stop running; acquiring outdoor environment temperature; and controlling the air conditioner to operate in a condensed water self-cleaning mode or a frosting self-cleaning mode according to the outdoor environment temperature. The self-cleaning effect can be improved by adopting the method.

Description

Self-cleaning control method for outdoor heat exchanger, air conditioner and computer storage medium
Technical Field
The present invention relates to the field of air conditioners, and more particularly, to a self-cleaning control method for an outdoor heat exchanger, an air conditioner, and a computer storage medium.
Background
Because dust is attached to the outdoor heat exchanger, floccules or large-particle dust is attached to the windward side of the outdoor heat exchanger, and the floccules are filled in gaps among the fins of the outdoor heat exchanger, when the outdoor heat exchanger is self-cleaned, the outdoor heat exchanger is only cleaned by melting self-cleaning frost into water to be flushed, and the floccules attached to the windward side of the outdoor heat exchanger are difficult to clean.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a self-cleaning control method for an outdoor heat exchanger, by which the self-cleaning effect can be improved.
Another object of the present invention is to provide an air conditioner.
It is still another object of the present invention to provide a computer storage medium.
In order to solve the above problems, an embodiment of a first aspect of the present invention provides a self-cleaning control method for an outdoor heat exchanger. Responding to the self-cleaning instruction, and controlling the outdoor motor to reversely run; detecting that the outdoor motor meets a pre-cleaning condition, and controlling the outdoor motor to stop running; acquiring outdoor environment temperature; and controlling the air conditioner to operate in a condensed water self-cleaning mode or a frosting self-cleaning mode according to the outdoor environment temperature.
According to the self-cleaning control method for the outdoor heat exchanger, provided by the embodiment of the invention, the outdoor motor is controlled to reversely run in response to the self-cleaning instruction, so that the outdoor heat exchanger is primarily cleaned, floccules or large-particle dust attached to the outdoor heat exchanger are blown off, and the air conditioner is controlled to perform self-cleaning on the basis of the floccules or large-particle dust, so that the self-cleaning effect is improved. And judging the moisture content of the outdoor air by the outdoor environment temperature, and further determining a condensed water self-cleaning mode or a frosting self-cleaning mode of the air conditioner, so that when the moisture content of the outdoor air is higher, the air conditioner is controlled to operate the condensed water self-cleaning mode to enable condensed water to be formed on the outdoor heat exchanger to achieve the purpose of self-cleaning, and when the moisture content of the outdoor air is lower, the air conditioner is controlled to operate the frosting self-cleaning mode to enable the outdoor heat exchanger to frost and melt into water to enable the dust to be flushed to achieve the purpose of self-cleaning, and therefore, the optimal self-cleaning mode is selected based on the outdoor environment temperature to achieve the self-cleaning function, high efficiency of the air conditioner can be achieved, and the self-cleaning effect of the air conditioner is improved.
In some embodiments, the detecting that the outdoor motor satisfies a pre-cleaning condition includes: the running time of the outdoor motor reaches a preset time threshold value, and the outdoor motor is determined to meet the pre-cleaning condition; or when the running current of the outdoor motor is smaller than a preset current threshold value, determining that the outdoor motor meets the pre-cleaning condition.
In some embodiments, controlling the reverse operation of the outdoor motor includes: and controlling the outdoor motor to reversely operate at the maximum allowable rotating speed.
In some embodiments, controlling the air conditioner to operate in a condensate self-cleaning mode or a frosting self-cleaning mode according to the outdoor ambient temperature includes: determining that the outdoor environment temperature is greater than or equal to a first preset temperature, and controlling the air conditioner to operate in the condensate water self-cleaning mode; determining that the outdoor environment temperature is less than or equal to a second preset temperature, and controlling the air conditioner to operate in the frosting self-cleaning mode; and determining that the outdoor environment temperature is smaller than the first preset temperature and larger than the second preset temperature, acquiring the outdoor environment relative humidity, and controlling the air conditioner to operate in a condensed water self-cleaning mode or a frosting self-cleaning mode according to the outdoor environment temperature and the outdoor environment relative humidity.
In some embodiments, controlling the air conditioner to operate in a condensate water self-cleaning mode or a frosting self-cleaning mode according to the outdoor environment temperature and the outdoor environment relative humidity comprises: obtaining a dew point temperature according to the outdoor environment temperature and the outdoor environment relative humidity; determining that the dew point temperature is greater than or equal to a third preset temperature, and controlling the air conditioner to operate in the condensed water self-cleaning mode; and determining that the dew point temperature is smaller than the third preset temperature, and controlling the air conditioner to operate in the frosting self-cleaning mode.
In some embodiments, controlling the air conditioner to operate in a condensate self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling an indoor motor to run at an initial rotating speed, controlling an indoor air deflector to move to an anti-direct blowing position, controlling a compressor to run at a first initial frequency, controlling the opening of an expansion valve to be a first preset opening, and controlling an outdoor motor to run at the first preset rotating speed; the time that the compressor runs at the first initial frequency reaches a first preset time; acquiring the current evaporation temperature; and controlling at least one of the operating frequency of the compressor and the opening degree of the expansion valve according to the current evaporation temperature so that the current evaporation temperature is in a condensed water self-cleaning temperature range.
In some embodiments, the controlling at least one of the operating frequency of the compressor and the opening degree of the expansion valve according to the current evaporating temperature includes: if the current evaporation temperature is determined to be smaller than a fourth preset temperature, controlling the running frequency of the compressor to be reduced or controlling the opening degree of the expansion valve to be increased, wherein the fourth preset temperature is the lower limit value of the self-cleaning temperature range of the condensed water; if the current evaporation temperature is determined to be greater than a fifth preset temperature, controlling the running frequency of the compressor to rise, or controlling the opening degree of the expansion valve to be reduced, wherein the fifth preset temperature is the upper limit value of the self-cleaning temperature range of the condensed water; and if the current evaporation temperature is determined to be greater than or equal to the fourth preset temperature and less than or equal to the fifth preset temperature, controlling the running frequency of the compressor and the opening of the expansion valve to be unchanged.
In some embodiments, controlling the air conditioner to operate in a frosting self-cleaning mode includes: controlling the air conditioner to operate in a heating mode; controlling an indoor motor to run at a second preset rotating speed, controlling an indoor air deflector to move to an anti-direct blowing position, controlling a compressor to run at a second initial frequency, controlling the opening of an expansion valve to be a second preset opening, and controlling the outdoor motor to stop running; the time that the compressor runs at the second initial frequency reaches a second preset time; acquiring the current evaporation temperature; and controlling at least one of the operating frequency of the compressor and the opening degree of the expansion valve according to the current evaporation temperature so that the current evaporation temperature is in a frosting self-cleaning temperature range.
In some embodiments, the controlling at least one of the operating frequency of the compressor and the opening degree of the expansion valve according to the current evaporating temperature includes: if the current evaporation temperature is less than a sixth preset temperature, controlling the running frequency of the compressor to be reduced or controlling the opening degree of the expansion valve to be increased, wherein the sixth preset temperature is the lower limit value of the self-cleaning temperature range of the condensed water; if the current evaporation temperature is determined to be greater than a seventh preset temperature, controlling the running frequency of the compressor to rise, or controlling the opening degree of the expansion valve to be reduced, wherein the seventh preset temperature is the upper limit value of the self-cleaning temperature range of the condensed water; and if the current evaporation temperature is determined to be greater than or equal to the sixth preset temperature and less than or equal to the seventh preset temperature, controlling the operation frequency of the compressor and the opening of the expansion valve to be unchanged.
In some embodiments, the method further comprises: acquiring a current temperature of a power module for driving the compressor before controlling at least one of an operation frequency of the compressor and an opening degree of the expansion valve according to the current evaporation temperature; and controlling at least one of the operating frequency of the compressor and the rotating speed of the outdoor motor according to the current temperature of the power module so that the current temperature of the power module is in a safe operating temperature range.
An embodiment of a second aspect of the present invention provides an air conditioner, including: the temperature sensor is used for collecting outdoor environment temperature; at least one processor; a memory communicatively coupled to at least one of the processors; the memory stores a computer program executable by at least one processor, and the self-cleaning control method for the outdoor heat exchanger is realized when the at least one processor executes the computer program.
According to the air conditioner provided by the embodiment of the invention, the cleaning effect can be improved by executing the self-cleaning control method for the outdoor heat exchanger provided by the embodiment of the invention through the processor.
An embodiment of a third aspect of the present invention provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the self-cleaning control method for an outdoor heat exchanger described in the above embodiment.
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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a method of self-cleaning control of an outdoor heat exchanger according to one embodiment of the present invention;
FIG. 2 is a flow chart of a method of self-cleaning control of an outdoor heat exchanger according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of temperature versus time of a power module according to one embodiment of the invention;
FIG. 4 is a flow chart of a condensate self-cleaning mode in accordance with one embodiment of the present invention;
FIG. 5 is a flow chart of a condensate self-cleaning mode according to another embodiment of the present invention;
FIG. 6 is a flow chart of a frosting self-cleaning mode according to one embodiment of the present invention;
FIG. 7 is a flow chart of a frosting self-cleaning mode according to another embodiment of the present invention;
fig. 8 is a block diagram of an air conditioner according to an embodiment of the present invention.
Reference numerals:
an air conditioner 10;
a temperature sensor 1; a processor 2; and a memory 3.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
In the related art, floccules or large-particle dust are easy to adhere to the outdoor heat exchanger, and the outdoor heat exchanger is flushed only by means of self-cleaning frosting and water melting, so that the cleaning effect is limited.
In order to solve the above problems, an embodiment of the first aspect of the present invention provides a self-cleaning control method for an outdoor heat exchanger, by which a self-cleaning effect can be improved.
The following describes a self-cleaning control method for an outdoor heat exchanger according to an embodiment of the present invention with reference to fig. 1, and as shown in fig. 1, the method at least includes steps S1 to S4.
And step S1, responding to the self-cleaning instruction, and controlling the outdoor motor to reversely run.
In an embodiment, for the self-cleaning instruction, a user may send the self-cleaning instruction to the air conditioner through a remote controller, an Application (APP) of the air conditioner in the mobile terminal, or a control panel on the body of the air conditioner, through operation modes such as language, gesture, etc., so as to trigger the self-cleaning function of the air conditioner. Or the air conditioner can be provided with a periodic self-starting self-cleaning instruction to trigger the self-cleaning function of the air conditioner, namely, the air conditioner can automatically trigger the self-cleaning instruction at intervals to execute the self-cleaning function, so that the self-cleaning instruction can be periodically and automatically started without manual operation of a user, the air conditioner is cleaned, and the intelligence of the air conditioner is improved.
Specifically, after receiving the self-cleaning instruction to the outdoor heat exchanger, the air conditioner does not directly execute the frosting self-cleaning process, but controls the outdoor motor to reversely run, so that wind generated by the outdoor fan can blow off floccules or large-particle dust attached to the windward side of the outdoor heat exchanger to primarily clean the outdoor heat exchanger, and the cleaning difficulty caused by the existence of the floccules or the large-particle dust can be reduced in the follow-up self-cleaning process.
In some embodiments, the outdoor motor of the embodiments of the present invention is a dc motor, because the ac motor cannot operate in reverse.
And S2, detecting that the outdoor motor meets the pre-cleaning condition, and controlling the outdoor motor to stop running.
The pre-cleaning condition can be understood as a preset condition for completing preliminary cleaning of the outdoor heat exchanger, that is, when the outdoor motor meets the pre-cleaning condition, the cleaning task of floccules or large-particle dust attached to the windward side of the outdoor heat exchanger is completed under the action of the reverse running of the outdoor motor; if the outdoor motor does not meet the pre-cleaning condition, the floccule or large-particle dust attached to the windward side of the outdoor heat exchanger is not completely removed under the action of the reverse running of the outdoor motor.
Specifically, when the outdoor motor is detected to meet the pre-cleaning condition, it is indicated that the floccule or large-particle dust attached to the windward side of the outdoor heat exchanger is blown off under the action of the reverse operation of the outdoor motor, and the preliminary cleaning of the outdoor heat exchanger is completed, so that the outdoor motor is controlled to be stopped to perform the subsequent self-cleaning operation.
And S3, acquiring the outdoor environment temperature.
In an embodiment, a temperature sensor may be disposed at a suitable position of the outdoor unit of the air conditioner to collect the outdoor environment temperature in real time, for example denoted as Tout, and the temperature sensor sends the outdoor environment temperature Tout collected in real time to a controller of the air conditioner, for example, an indoor unit controller or an outdoor unit controller or a controller independently disposed; alternatively, the air conditioner may communicate with the cloud end to obtain the outdoor environment temperature Tout, that is, the cloud end may record the outdoor environment temperature Tout, for example, the outdoor environment temperature provided by the local weather forecast, and the air conditioner may communicate with the cloud end in an interactive manner to directly obtain the outdoor environment temperature Tout.
And S4, controlling the air conditioner to operate in a condensate water self-cleaning mode or a frosting self-cleaning mode according to the outdoor environment temperature.
The condensed water self-cleaning mode is a self-cleaning mode in which the air conditioner converts water vapor in the outdoor air into liquid water and washes the outdoor heat exchanger with the liquid water; the frosting self-cleaning mode refers to a self-cleaning mode in which the outdoor heat exchanger is controlled to frost and melt the frost into water to wash the outdoor heat exchanger.
In the embodiment, taking a certain type of outdoor heat exchanger as an example, the outdoor heat exchanger has a size of 80cm long by 52.4cm wide by 1.82cm thick, and the theoretical maximum frosting volume of the whole outdoor heat exchanger is 0.0062m 3 And the density of frost on the fins of the outdoor heat exchanger is about 100kg/m 3 Therefore, when the air conditioner is operated in the frosting self-cleaning mode, the theoretical maximum water amount after the frosting is fully formed on the outdoor heat exchanger, and the frosting is melted into water is 0.63kg, however, in the frosting self-cleaning mode, the actual water amount for self-cleaning melting each time is between 0.21kg and 0.54kg due to the influence of various factors such as the outdoor air state, the average water amount is about 0.35kg, and the theoretical maximum water amount is not 0.63kg, namely, when the air conditioner is operated in the frosting self-cleaning mode, the water amount for flushing dust is about 0.35kg. In addition, due to the different moisture content of the outdoor air, the time of the self-cleaning frosting stage in the frosting self-cleaning mode is 15min to 3Between 0 min.
For the self-cleaning mode of the condensed water of the air conditioner, referring to the dehumidification gauges corresponding to different outdoor environment temperatures and different outdoor environment relative humidities shown in table 1, taking the outdoor environment temperature of 20 ℃ and the outdoor environment relative humidity of 70% as an example, when the evaporation temperature is controlled to be 2 ℃, the circulating air quantity is 250m 3 The dehumidifying amount per hour can reach 2.186kg, based on which, if the time of running the condensed water self-cleaning mode each time is 15min, the water amount generated by each self-cleaning is about 0.55kg, that is, for the same outdoor heat exchanger, the water amount for flushing dust when the air conditioner runs the condensed water self-cleaning mode is about 0.55kg; taking the outdoor environment temperature of 27 ℃ and the outdoor environment relative humidity of 45% as examples, when the evaporation temperature is controlled to be 2 ℃, the circulating air quantity is 250m 3 The dehumidifying amount per hour can reach 2.148kg, based on the fact that if the time of running the condensed water self-cleaning mode each time is 15min, the water amount generated by each self-cleaning is about 0.54kg, namely, for the same outdoor heat exchanger, the water amount for flushing dust when the air conditioner runs the condensed water self-cleaning mode is about 0.54kg; taking the outdoor environment temperature of 35 ℃ and the outdoor environment relative humidity of 60% as examples, when the evaporation temperature is controlled to be 10 ℃, the circulating air quantity is 250m 3 The dehumidification per hour can reach 4.542kg, based on which, if the time of running the condensate self-cleaning mode is 15min each time, the amount of water generated per self-cleaning is about 1.13kg, that is, for the same outdoor heat exchanger, the amount of water that can wash dust is about 1.13kg when the air conditioner runs the condensate self-cleaning mode. Therefore, when the dew point temperature TL is higher, the self-cleaning effect of the air conditioner in the condensate self-cleaning mode is obviously better than that of the air conditioner in the frosting self-cleaning mode. The dew point temperature refers to the temperature required by the water vapor in the air conditioner to be converted into liquid water in the current environment.
Wherein, the relation formula of the dehumidification amount and the dew point temperature is G=K.V.T (TL-Te), wherein G is the dehumidification amount, K is a constant, V is the circulating air quantity, TL is the dew point temperature, te is the evaporation temperature.
And, referring to table 1, the dehumidification amount is larger as the evaporation temperature is closer to zero. When the outdoor environment temperature Tout is set, the higher the outdoor environment relative humidity Rh, the higher the dew point temperature TL, and the higher the moisture content in the outdoor air. When the evaporation temperature is lower than the dew point temperature TL, the dehumidification amount is larger than zero, and condensation water is generated in the air conditioner; when the evaporation temperature is higher than the dew point temperature TL, the dehumidification amount is 0, and condensation water is not generated in the air conditioner; while the lower the evaporation temperature, the greater the amount of dehumidification, when the dew point temperature TL is fixed. When the circulation air quantity is fixed, the larger the difference between the dew point temperature TL and the evaporation temperature is, the larger the dehumidification amount is.
Further, in the embodiment, the dew point temperature may be calculated by the following formula.
TL＝C1*Tout+C2*Rh/100-C3
Where TL is the dew point temperature, tout is the outdoor ambient temperature, rh is the outdoor ambient relative humidity, C1 is the temperature constant, C2 is the humidity constant, and C3 is the constant.
TABLE 1
Figure BDA0003380835020000071
Based on the above formula, referring to the dew point temperature tables shown in tables 2 and 3 for different outdoor environment temperatures and different outdoor environment relative humidities, it can be seen from tables 2 and 3 that when the outdoor environment relative humidities are constant, the higher the outdoor environment temperature is, the higher the dew point temperature is, that is, when the outdoor environment temperature is higher, the higher the dew point temperature is, and the higher the moisture content in the outdoor air is, especially for summer, the outdoor environment temperature and the outdoor environment relative humidity are significantly higher than those in winter.
TABLE 2
Figure BDA0003380835020000072
Therefore, based on the description, when the outdoor heat exchanger is self-cleaned, two self-cleaning modes of a condensation water self-cleaning mode and a frosting self-cleaning mode are simultaneously set, and the outdoor environment temperature is taken as a judging condition for selecting and executing a certain self-cleaning mode, so that when the outdoor environment temperature Tout is higher, the moisture content of the outdoor air is larger, and enough condensation water can be generated to clean dust and dirt on the surface of the outdoor heat exchanger, therefore, the air conditioner is controlled to operate in the condensation water self-cleaning mode, so that water in unit air can be separated out, condensation water is formed on fins of the outdoor heat exchanger, dust attached to the fins is continuously flushed, the self-cleaning purpose is effectively achieved, and compared with the frosting self-cleaning mode, the self-cleaning effect can be effectively improved; when the outdoor ambient temperature Tout is low, it is indicated that the moisture content of the outdoor air is low at this time, and a sufficient amount of condensed water cannot be generated to remove the dust and dirt on the surface of the outdoor heat exchanger, so that the air conditioner is controlled to operate in a frosting self-cleaning mode to realize a self-cleaning function through frosting and defrosting processes. Therefore, the optimal self-cleaning mode is selected based on the outdoor environment temperature Tout to complete the self-cleaning function of the air conditioner, so that the air conditioner can be efficiently self-cleaned, and the self-cleaning effect of the air conditioner can be improved.
TABLE 3 Table 3
Figure BDA0003380835020000081
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According to the self-cleaning control method for the outdoor heat exchanger, provided by the embodiment of the invention, the outdoor motor is controlled to reversely run in response to the self-cleaning instruction, so that the outdoor heat exchanger is primarily cleaned, floccules or large-particle dust attached to the outdoor heat exchanger are blown off, and the air conditioner is controlled to perform self-cleaning on the basis of the floccules or large-particle dust, so that the self-cleaning effect is improved. And judging the moisture content of the outdoor air by the outdoor environment temperature, and further determining a condensed water self-cleaning mode or a frosting self-cleaning mode of the air conditioner, so that when the moisture content of the outdoor air is higher, the air conditioner is controlled to operate the condensed water self-cleaning mode to enable condensed water to be formed on the outdoor heat exchanger to achieve the purpose of self-cleaning, and when the moisture content of the outdoor air is lower, the air conditioner is controlled to operate the frosting self-cleaning mode to enable the outdoor heat exchanger to frost and melt into water to enable the dust to be flushed to achieve the purpose of self-cleaning, and therefore, the optimal self-cleaning mode is selected based on the outdoor environment temperature to achieve the self-cleaning function, high efficiency of the air conditioner can be achieved, and the self-cleaning effect of the air conditioner is improved.
In some embodiments, when the operation time of the outdoor motor reaches a preset time threshold, determining that the outdoor motor meets a pre-cleaning condition, that is, judging whether the preliminary cleaning of the outdoor heat exchanger is completed by the operation time of the outdoor motor, if the operation time of the outdoor motor reaches the preset time threshold, indicating that the cleaning task of floccules or large-particle dust attached to the windward side of the outdoor heat exchanger is completed under the action of the reverse operation of the outdoor motor, thereby determining that the outdoor motor meets the pre-cleaning condition; or when the running current of the outdoor motor is smaller than the preset current threshold value, determining that the outdoor motor meets the pre-cleaning condition, that is, judging whether the preliminary cleaning of the outdoor heat exchanger is finished by the running current of the outdoor motor, specifically, along with the gradual reduction of the running current of the outdoor motor, indicating that the wind resistance formed when the outdoor fan blows off the attachments on the outdoor heat exchanger is gradually reduced, and along with the gradual reduction of the wind resistance of the outdoor fan, indicating that the attachments on the outdoor heat exchanger are gradually cleaned, so that the outdoor motor can be determined to meet the pre-cleaning condition when the running current of the outdoor motor is smaller than the preset current threshold value.
In some embodiments, the outdoor motor can be controlled to reversely run at the maximum allowable rotation speed, so that the air quantity generated by the outdoor fan can quickly finish the primary cleaning of the outdoor heat exchanger, and the self-cleaning efficiency of the outdoor heat exchanger is improved.
The maximum allowable rotation speed is understood to be the maximum rotation speed allowed when the outdoor motor normally operates, that is, when the rotation speed of the outdoor motor exceeds the maximum allowable rotation speed, the outdoor motor is damaged, so that the reliability of the use of the outdoor motor can be ensured and the self-cleaning efficiency can be improved by controlling the outdoor motor to reversely operate at the maximum allowable rotation speed.
In some embodiments, when it is determined that the outdoor ambient temperature Tout is greater than or equal to the first preset temperature T1, it is indicated that the ambient temperature at which the outdoor heat exchanger is located is higher, and as known from a calculation formula based on the dew point temperature, the dew point temperature obtained by the outdoor ambient temperature Tout is also higher, so that the moisture content in the outdoor air is also higher, and the condensate water generated under the current moisture content of the outdoor air can meet the water demand for cleaning the outdoor heat exchanger, so that the air conditioner is controlled to operate in a condensate water self-cleaning mode, so as to achieve the purpose of self-cleaning the outdoor heat exchanger, and the self-cleaning effect can be improved; when the outdoor environment temperature Tout is less than or equal to the second preset temperature T2, the condensation water generated under the current moisture content of the outdoor air cannot meet the water quantity requirement for cleaning the outdoor heat exchanger, so that the air conditioner is controlled to operate in a frosting self-cleaning mode so as to realize self-cleaning of the outdoor heat exchanger.
The first preset temperature T1 may be set according to the actual situation, such as the installation environment of the air conditioner, and is not limited thereto, for example, various climatic conditions are comprehensively considered, and the outdoor environment relative humidity is the lowest 45% in summer, and the dew point temperature TL corresponding to the outdoor environment temperature Tout being 27 ℃ is 14.1 ℃ as shown in table 2 and table 3, so that when the outdoor environment temperature Tout is greater than or equal to 27 ℃, the dew point temperature TL is greater than or equal to 14.1 ℃; further, referring to table 1, at a dew point temperature of 14.1 ℃, the condensation water generated under the moisture content of the outdoor air is enough to meet the water amount requirement for cleaning the outdoor heat exchanger, and thus, the first preset temperature T1 may be set to 27 ℃, so that when the outdoor ambient temperature Tout is greater than or equal to 27 ℃, it may be determined that the moisture content in the outdoor air is large without judging the dew point temperature TL, and thus, the air conditioner operates in the condensation water self-cleaning mode. Similarly, the second preset temperature T2 may also be set according to the actual situation, such as the installation environment of the air conditioner, and this is not limited, for example, as shown in table 2 and table 3, when the outdoor environment temperature Tout is less than or equal to 16 ℃, even if the outdoor environment relative humidity reaches 90% or higher, the dew point temperature TL corresponding to the outdoor environment relative humidity is 14.2 ℃, so when the outdoor environment temperature Tout is less than or equal to 16 ℃, the cleaning effect is poor if the air conditioner operates in the condensed water self-cleaning mode, and thus, the second preset temperature T2 may be set to 16 ℃, and when the outdoor environment temperature Tout is greater than or equal to 16 ℃, the moisture content in the outdoor air may be determined to be small without determining the dew point temperature TL, so that the air conditioner operates in the frosted self-cleaning mode.
And if the outdoor environment temperature Tout is determined to be smaller than the first preset temperature T1 and larger than the second preset temperature T2, the fact that the moisture content in the outdoor air cannot be confirmed at the current outdoor environment temperature Tout is indicated, the outdoor environment relative humidity needs to be further acquired, the condensed water self-cleaning mode or the frosting self-cleaning mode of the air conditioner is controlled by combining the outdoor environment temperature and the outdoor environment relative humidity, so that the optimal self-cleaning mode is selected to complete the self-cleaning function of the air conditioner, high-efficiency self-cleaning of the air conditioner is achieved, and the self-cleaning effect of the air conditioner is improved.
In some embodiments, the dew point temperature TL is obtained from the outdoor ambient temperature and the outdoor ambient relative humidity, in particular, the dew point temperature TL may be obtained by the dew point temperature TL calculation formula provided above; if the dew point temperature TL is determined to be greater than or equal to the third preset temperature T3, the fact that the moisture content of the outdoor air is larger at the moment is indicated, and enough condensed water can be generated to remove dust and dirt on the surface of the outdoor heat exchanger, so that the air conditioner is controlled to operate in a condensed water self-cleaning mode, water in unit air can be separated out, condensed water is formed on fins of the outdoor heat exchanger, dust attached to the fins is continuously flushed, the purpose of self-cleaning is effectively achieved, and compared with a frosting self-cleaning mode, the self-cleaning effect can be effectively improved; if the dew point temperature TL is determined to be less than the third preset temperature T3, it is indicated that the moisture content of the outdoor air is small at this time, and a sufficient amount of condensed water cannot be generated to remove the dust and dirt on the surface of the outdoor heat exchanger, so that the air conditioner is controlled to operate in a frosting self-cleaning mode to realize a self-cleaning function through frosting and defrosting processes.
The third preset temperature T3 may be set according to an actual situation, such as an installation environment of the air conditioner, and is not limited thereto. For example, referring to table 1, when the dew point temperature TL is greater than 10 ℃, the condensation water generated under the moisture content of the outdoor air may reach the water amount requirement for cleaning the outdoor heat exchanger, and thus, the third preset temperature T3 may be set to a value greater than 10 ℃. In order to produce a maximized amount of water in the condensate self-cleaning mode, the third preset temperature T3 is preferably 14 ℃.
The method for controlling the self-cleaning of the outdoor heat exchanger according to the embodiment of the present invention is illustrated with reference to fig. 2, and the specific contents are as follows.
Step S5, in response to the self-cleaning instruction, the air conditioner starts a self-cleaning function for the outdoor heat exchanger.
Step S6, the outdoor motor is controlled to reversely operate at the maximum allowable rotation speed rmax.
And S7, controlling the outdoor motor to stop running when the running time of the outdoor motor reaches a preset time threshold t 6S.
Step S8, detecting the outdoor ambient temperature Tout.
In step S9, the outdoor ambient temperature Tout is greater than or equal to the first preset temperature T1.
In step S10, the outdoor ambient temperature Tout is less than the first preset temperature T1 and greater than the second preset temperature T2.
In step S11, the outdoor ambient temperature Tout is less than or equal to the second preset temperature T2.
Step S12, the air conditioner operates in the condensed water self-cleaning mode.
In step S13, the outdoor environment temperature Tout and the outdoor environment relative humidity are acquired.
Step S14, the air conditioner operates in a frosting self-cleaning mode.
In step S15, the dew point temperature TL is calculated.
In step S16, it is determined whether the dew point temperature TL is greater than or equal to the third preset temperature T3. If yes, go to step S12; if not, step S14 is performed.
Therefore, when the outdoor environment temperature Tout can accurately judge the moisture content of the outdoor air, the embodiment of the invention uses the outdoor environment temperature Tout as the judging condition of the air conditioner to execute the condensate self-cleaning mode or the frosting self-cleaning mode; when the outdoor environment temperature Tout is insufficient to judge the moisture content of the outdoor air, the dew point temperature TL is used as a judging condition of the air conditioner to execute a condensation water self-cleaning mode or a frosting self-cleaning mode, so that the air conditioner can select an optimal self-cleaning mode to finish the self-cleaning function of the outdoor heat exchanger, the high-efficiency self-cleaning of the outdoor heat exchanger can be realized, and the self-cleaning effect of the outdoor heat exchanger can be improved.
In some embodiments, the air conditioner when operating in the condensed water self-cleaning mode includes: controlling an air conditioner to operate a heating mode; controlling the indoor motor to run at an initial rotating speed, for example, denoted as R1 (0), controlling the indoor air deflector to move to a direct blowing preventing position, controlling the compressor to run at a first initial frequency, for example, denoted as F1 (0), controlling the opening of the expansion valve to be at a first preset opening, for example, denoted as EEV1 (0), and controlling the outdoor motor to run at a first preset rotating speed, for example, denoted as R1 (0); the time for the compressor to run at the first initial frequency F1 (0) reaches a first preset time, for example denoted t1; acquiring the current evaporating temperature Te; at least one of the operating frequency of the compressor and the opening degree of the expansion valve is controlled according to the current evaporation temperature Te so that the current evaporation temperature Te is in the condensed water self-cleaning temperature range. Through the process, the analysis amount of water in unit air can be effectively maximized, a large amount of condensed water is formed on the outdoor heat exchanger fins so as to continuously wash dust attached to the fins, the self-cleaning function is completed, and meanwhile, the indoor air deflector is controlled to move to a direct blowing prevention position or to be positioned at a courtyard airflow position and kept unchanged, so that the problem of discomfort caused by direct blowing of cold air by users can be effectively avoided, and the user experience is improved.
The initial rotational speed R1 (0) may be preset according to practical situations, such as a fan type and a condensed water self-cleaning temperature range, and is preferably a low gear. The first initial frequency F1 (0) may be preset according to practical conditions such as a compressor specification of an air conditioner configuration and a condensed water self-cleaning temperature range. The first preset opening EEV1 (0) may be preset according to actual conditions such as an expansion valve specification of an air conditioner configuration and a condensed water self-cleaning temperature range. The first preset rotational speed r1 (0) may be preset according to actual conditions such as a fan type and a condensed water self-cleaning temperature range.
In an embodiment, after the operation time of the compressor reaches the first preset time t1, the current evaporation temperature Te may be periodically detected until the operation time of the compressor reaches the preset cleaning time t3 of the condensate self-cleaning mode, and the condensate self-cleaning mode is exited, thereby completing the self-cleaning process. The detection period of the current evaporation temperature Te may be set according to the actual situation, and is not limited thereto.
In the embodiment, since the outdoor environment temperature and the outdoor environment relative humidity are both determined by the initial state of the outdoor air and cannot be freely controlled, in the condensed water self-cleaning mode, the maximum generation of the condensed water is achieved by controlling the current evaporation temperature Te to be in the condensed water self-cleaning temperature range.
Further, referring to table 4, there are shown trend tables of the influence of the operating frequency of the compressor, the rotation speed of the indoor motor, the rotation speed of the outdoor motor, and the opening degree of the expansion valve on the evaporating temperature, the condensing temperature, and the temperature of the power module, respectively.
TABLE 4 Table 4
Figure BDA0003380835020000121
As can be seen from table 2, the operation frequency of the compressor or the opening degree of the expansion valve affects the change of the current evaporation temperature Te, and as the operation frequency of the compressor increases, the current evaporation temperature decreases, whereas the current evaporation temperature increases; as the opening degree of the expansion valve decreases, the current evaporation temperature decreases, whereas the current evaporation temperature increases. Therefore, in the embodiment of the invention, the current evaporating temperature Te can be effectively regulated by controlling the running frequency of the compressor or the opening degree of the expansion valve, so that the current evaporating temperature meets the temperature range of the self-cleaning requirement.
In some embodiments, when the current evaporating temperature Te is determined to be less than the fourth preset temperature T4, the current evaporating temperature Te is lower, and in order to avoid the situation that frosting occurs due to the fact that the current evaporating temperature Te is too low, the operation frequency of the compressor is controlled to be reduced, or the opening degree of the expansion valve is controlled to be increased so as to improve the current evaporating temperature Te, wherein the fourth preset temperature T4 is the lower limit value of the condensed water self-cleaning temperature range; when the current evaporating temperature Te is determined to be larger than a fifth preset temperature T5, the fact that the current evaporating temperature Te is higher is indicated, and in order to effectively convert water vapor in outdoor air into liquid water, the operation frequency of a compressor is controlled to be increased, or the opening degree of an expansion valve is controlled to be reduced so as to reduce the current evaporating temperature Te, wherein the fifth preset temperature T5 is the upper limit value of a condensed water self-cleaning temperature range; when the current evaporating temperature Te is determined to be greater than or equal to the fourth preset temperature T4 and less than or equal to the fifth preset temperature T5, the current evaporating temperature Te is indicated to be capable of separating out water in outdoor air and avoiding the problem of frosting, so that the running frequency of the compressor and the opening of the expansion valve are controlled to be unchanged, the current evaporating temperature Te is in a condensed water self-cleaning temperature range, the requirement of maximizing the analysis amount of water in air is met, and the cleaning effect is ensured.
For the fourth preset temperature T4 and the fifth preset temperature T5, consider that the evaporation temperature is closer to zero, the dehumidification amount is larger, and in order to avoid the problem of frosting, the evaporation temperature needs to be greater than 0 ℃, and in the embodiment of the present invention, the value ranges of the fourth preset temperature T4 and the fifth preset temperature T5 are respectively: 1 ℃ less than or equal to 3 ℃ and 3 ℃ less than or equal to 3 ℃ and less than or equal to 6 ℃ and less than or equal to 5 ℃ and less than or equal to 3 ℃, for example, the fourth preset temperature T4 can be 1 ℃ or 1.5 ℃ or 3 ℃, the fifth preset temperature T5 can be 3 ℃ or 3.5 ℃ or 6 ℃, preferably, the fourth preset temperature T4 is 1 ℃, and the fifth preset temperature T5 is 4 ℃. Therefore, the analysis amount of water in the outdoor air can be effectively maximized, the cleaning requirement on the outdoor heat exchanger is met, and the cleaning effect is ensured.
In an embodiment, since the outdoor motor is stopped to operate when the outdoor heat exchanger is frosted and self-cleaned, at this time, the power module such as IPM (Intelligent Power Module ) module, silicon bridge, IGBT (Insulated Gate Bipolar Transistor ) module, etc. can only rely on natural convection heat exchange, but the temperature of the power module increases rapidly with time, and as shown in fig. 3, the shorter the time it takes for the temperature of the power module to reach 85 ℃ which is a reliable temperature point, the risk of burning or breakdown exists for the power module once the temperature of the power module exceeds the reliable temperature point, and the higher the temperature of the power module, the greater the risk of being broken or burned. Therefore, in the process of controlling the air conditioner to operate in the condensed water self-cleaning mode or the frosting self-cleaning mode, the embodiment of the invention also can detect the temperature of the power module so as to ensure the reliability of the power module and avoid the problem of burning or breakdown caused by overhigh temperature of the power module.
For a process of operating the condensed water self-cleaning mode of the air conditioner, before controlling at least one of an operation frequency of the compressor and an opening degree of the expansion valve according to a current evaporation temperature, at least one of an operation frequency of the compressor and a rotation speed of the outdoor motor is controlled according to the current temperature of the power module by acquiring the current temperature of the power module for driving the compressor so that the current temperature of the power module is in a safe operation temperature range.
The safe operating temperature range is understood to be a temperature range in which the safe operation of the power module can be ensured, that is to say, in which the power module can operate normally; once outside this range, the power module is at risk of breakdown or burn-out.
Specifically, as shown with reference to table 4, since the power module is connected to the compressor for driving the compressor, by controlling the operation frequency of the compressor, the operation current in the power module can be adjusted based on the heating value q=i 2 Rt, along with the change of the running current in the power module, improves the self heating value of the power module so as to play a role in adjusting the current temperature of the power module, wherein Q is the heating value of the power module, and I is the running current of the power module R is the resistance of the power module, and t is the running time of the power module; and when the outdoor fan runs, the wind generated by the outdoor fan can forcedly exchange heat with the power module, so that the wind quantity generated by the outdoor fan can be changed by controlling the rotating speed of the outdoor fan, and the effect of adjusting the current temperature of the power module is achieved. Therefore, based on the above, in the process of running the condensate water self-cleaning mode, the air conditioner in the embodiment of the invention adjusts the current temperature of the power module by controlling at least one of the running frequency of the compressor and the rotating speed of the outdoor motor, so that the current temperature of the power module is in a safe working temperature range, thereby avoiding the problem of burning or breakdown caused by overhigh current temperature of the power module, ensuring the running reliability of the power module, and realizing the self-cleaning function of the outdoor heat exchanger while ensuring the reliability of the power module.
For example, in the condensed water self-cleaning mode, when the current temperature T0 of the power module is determined to be greater than the preset temperature threshold of the power module, the current temperature T0 of the power module can be effectively reduced by controlling at least one of the reduction of the operating frequency of the compressor and the increase of the rotating speed of the outdoor motor, so that the current temperature T0 of the power module is in a safe working temperature range, the problem of burning or breakdown caused by the overhigh current temperature of the power module is avoided, and the reliability of the power module is ensured.
Specifically, in the air conditioner running condensation water self-cleaning mode, when the current temperature T0 of the power module is determined to be greater than the third preset temperature T3, the running frequency of the compressor is controlled to be reduced, so that the running current in the power module is reduced, the heating value of the power module is reduced, the purpose of reducing the current temperature T0 of the power module is achieved, or the air quantity generated by the outdoor fan is increased by controlling the outdoor motor to increase the rotating speed, so that the power module is rapidly cooled, and the effect of reducing the current temperature T0 of the power module is achieved.
The preset temperature threshold of the power module may be set according to practical situations, such as specifications of devices in the power module, which is not limited. In an embodiment, the preset temperature threshold of the power module has a value range of 65 ℃ to 95 ℃ and preferably the preset temperature threshold T3 of the power module is 85 ℃.
And, when controlling the rotation speed increase of the outdoor motor, the rotation speed amplitude of each increase of the outdoor motor may be determined according to the actual situation, such as the type of the outdoor motor, without limitation. The rotation speed of the outdoor motor can be different gears of the outdoor motor, such as a high rotation speed gear and a low rotation speed gear, and when the rotation speed of the outdoor motor is increased, the value range of the rotation speed range of each increase is [1 gear, 10 gear ], for example, the rotation speed range of each increase can be 1 gear, 2 gear or 10 gear; alternatively, the rotation speed of the outdoor motor may be a specific rotation speed value, and the rotation speed range of each lifting is [5rpm,500rpm ], for example, the rotation speed range of each lifting may be 5rpm, 15rpm or 500rpm when the rotation speed of the outdoor motor is lifted.
In addition, when the current temperature T0 of the power module is adjusted, the current temperature T0 of the power module may be periodically detected until the current temperature T0 of the power module is in a safe operating temperature range. The detection period of the current temperature T0 of the power module may be set according to the actual situation, which is not limited.
For example, in the condensed water self-cleaning mode, the current temperature T0 of the power module is detected, if the current temperature T0 of the power module exceeds the safe operating temperature range, at least one of the operating frequency of the compressor and the rotational speed of the outdoor motor is controlled to adjust the current temperature T0 of the power module, and in the adjusting process, the current temperature T0 of the power module is detected once every T5s as a detection period to determine whether the current temperature T0 of the power module is in the safe operating temperature range.
It will be appreciated that, considering that the current temperature T0 of the power module needs to be in the safe operating temperature range, when determining that the current evaporating temperature Te is greater than the fifth preset temperature T5, if the current evaporating temperature Te is adjusted in a manner of controlling the operation frequency of the compressor to increase, the current temperature T0 of the power module is increased, so, in order to ensure the reliability of the power module, if the current evaporating temperature Te reaches the critical value of the safe operating temperature range after determining that the current evaporating temperature Te is greater than the fifth preset temperature T5, the current evaporating temperature Te may be adjusted only in a manner of controlling the opening degree of the expansion valve to decrease, so that the current temperature T0 of the power module is also controlled in the safe operating temperature range while the current evaporating temperature Te is in the condensate water self-cleaning range. Meanwhile, in order to prevent the opening degree of the expansion valve from being excessively small in the process of adjusting the current evaporation temperature Te in such a manner as to control the opening degree of the expansion valve to decrease, a minimum opening degree of the expansion valve needs to be set to, for example, 100 steps, that is, the opening degree of the expansion valve is limited to be greater than or equal to 100 steps in the process of closing the expansion valve.
The condensed water self-cleaning mode according to the embodiment of the present invention is illustrated with reference to fig. 4, and the following details are given.
Step S17, condensate self-cleaning mode.
In step S18, the rotational speed of the indoor motor is the initial rotational speed R1 (0).
In step S19, the operation frequency of the compressor is the first initial frequency F1 (0).
Step S20, the rotation speed of the outdoor motor is the first preset rotation speed r1 (0).
In step S21, the opening of the expansion valve is a first preset opening EEV1 (0).
Step S22, judging whether the continuous running time t of the compressor reaches a first preset time t1min. If yes, go to step S23; if not, step S22 is performed.
And S23, cleaning the condensed water.
Step S24, judging whether the time of the condensed water stage reaches the preset cleaning duration t2min of the condensed water self-cleaning mode. If yes, go to step S25; if not, step S23 is performed. The preset cleaning duration of the condensate water self-cleaning mode is the duration of completing the self-cleaning process in the condensate water self-cleaning mode.
Step S25, the condensed water self-cleaning mode is ended.
The condensed water washing process of the above step S23 is described in detail with reference to fig. 5 as follows.
And S26, cleaning the condensed water.
Step S27, judging whether the current temperature T0 of the power module is smaller than a preset temperature threshold of the power module. If not, executing step S28; if yes, go to step S30.
Step S28, controlling at least one of the operation frequency of the compressor to reduce and increase the rotation speed of the outdoor motor to adjust the current temperature T0 of the power module, so that the current temperature T0 of the power module is smaller than the preset temperature threshold of the power module.
Step S29, detecting the current temperature T0 of the power module again after the delay of T5 seconds, that is, periodically detecting the current temperature T0 of the power module with T5S as a detection period, until the current temperature T0 of the power module is less than or equal to the preset temperature threshold of the power module, and indicating that the current temperature T0 of the power module is in the safe working temperature range.
Step S30, obtaining the current evaporating temperature Te and judging whether the current evaporating temperature Te is in the condensed water self-cleaning temperature range [ T4, T5]. If the temperature is within the self-cleaning temperature range of the condensed water, step S31 is executed.
Step S31, controlling the operation frequency of the compressor and the opening degree of the expansion valve to be unchanged.
Step S32, if the current evaporating temperature Te is smaller than the fourth preset temperature T4, at least one of the reduction of the operating frequency of the compressor and the increase of the opening degree of the expansion valve is controlled.
Step S33, if the current evaporating temperature Te is larger than the fifth preset temperature T5, controlling at least one of the operation frequency increase of the compressor and the opening degree reduction of the expansion valve.
The following describes the procedure of the air conditioner in the embodiment of the present invention in terms of specific values for the operation of the condensate self-cleaning mode.
For example, the preset relevant parameters in the air conditioner are respectively: the first preset time T1 is 3min, the first preset temperature T1 is 27 ℃, the second preset temperature T2 is 16 ℃, the third preset temperature T3 is 14 ℃, the preset temperature threshold of the power module is 85 ℃, the maximum allowable rotating speed max is 1500rpm, the fourth preset temperature T4 is 1 ℃, the fifth preset temperature T5 is 4 ℃, the detection period T5 of the current temperature T0 is 10s, the preset time threshold T6 is 20s, the preset cleaning duration T2 of the condensate self-cleaning mode is 15min, the initial rotating speed R1 (0) is 3, the first initial frequency F1 (0) is 60Hz, the first preset opening EEV1 (0) is 250 steps, and the first preset rotating speed R1 (0) is 1 step.
Based on the setting parameters of the air conditioner, a user starts an outdoor self-cleaning function of the air conditioner, the controller firstly controls the outdoor motor to rotate reversely at a high speed of 1500rpm, and after the running time of the outdoor motor reaches 20 seconds, the outdoor motor is stopped. Further, the outdoor ambient temperature Tout is detected, and assuming that the outdoor ambient temperature is detected at 30 ℃ to > T1, the condensed water self-cleaning mode is executed. The indoor controller sends a heating mode to the outdoor controller and controls the indoor motor to run in 3 gears and the indoor air deflector to move to a direct blowing preventing position; the outdoor unit executes a heating mode, the compressor operates at a first initial frequency of F1 (0) =60 Hz, the opening EEV1 (0) =250 steps of the expansion valve, and the gear r1 (0) =1 of the outdoor motor. After the compressor is started and continuously runs for 3min, detecting the current temperature of the power module to be 54 ℃ < 85 ℃, detecting the current evaporating temperature Te=6 ℃ > T5, and controlling the running frequency of the compressor to be increased by 2Hz on the basis that the first initial frequency is F1 (0), namely, the compressor runs at 62 Hz. The circulation is performed until the current temperature of the power module is 86 ℃ higher than 85 ℃, and the rotating speed of the outdoor motor is controlled to rise by 2 gears on the basis of 1 gear, namely, the rotating speed of the outdoor motor is 3 gears; after the detection period reaches 10s, detecting the current temperature of the power module again to 84 ℃ less than 85 ℃, detecting the current evaporation temperature Te=5 ℃ more than T5 again, and controlling the opening of the expansion valve to be reduced by 10 steps on the basis of 250 steps, namely, controlling the opening of the expansion valve to be 240 steps; after a plurality of detection periods, detecting the current evaporating temperature Te=3℃ < T5, and at the moment, the current temperature of the power module is less than 85 ℃, controlling the running frequency of the compressor, the opening of the expansion valve, the rotating speed of the outdoor motor and the like to be unchanged until the running time T of the compressor is more than or equal to 15min, and exiting the condensed water cleaning stage, thereby completing the condensed water self-cleaning mode and realizing the self-cleaning of the air conditioner.
In some embodiments, the air conditioner when operating in the frosting self-cleaning mode comprises: controlling an air conditioner to operate a heating mode; controlling the indoor motor to run at a second preset rotating speed, for example, R2 (0), controlling the indoor air deflector to move to a direct blowing preventing position, controlling the compressor to run at a second initial frequency, for example, F2 (0), controlling the opening of the expansion valve to be a second preset opening, for example, EEV2 (0), and controlling the outdoor motor to stop running; the time that the compressor operates at the second initial frequency R2 (0) reaches a second preset time t3; acquiring the current evaporating temperature Te; at least one of an operating frequency of the compressor and an opening degree of the expansion valve is controlled according to the current evaporation temperature Te so that the current evaporation temperature Te is in a frosting self-cleaning temperature range. Through the process, the indoor evaporator can be frosted, so that the frosted indoor evaporator can be melted into water to continuously wash dust attached to the fins of the indoor evaporator to finish a self-cleaning function, and meanwhile, the indoor air deflector is controlled to move to a direct blowing prevention position or to be positioned at a courtyard airflow position to be unchanged, the problem of discomfort caused by direct blowing of cold air to a user can be effectively avoided, and the user experience is improved.
The second preset rotational speed R2 (0) may be preset according to actual conditions such as a fan type and a frosting self-cleaning temperature range. The second initial frequency F2 (0) may be preset according to practical conditions such as a compressor specification of an air conditioner configuration and a frosting self-cleaning temperature range. The second preset opening EEV2 (0) may be preset according to actual conditions such as the specification of an expansion valve configured for the air conditioner and a frosting self-cleaning temperature range.
In an embodiment, after the running time of the compressor reaches the second preset time t3, the current evaporating temperature Te may be periodically detected until the running time of the compressor reaches the preset cleaning time t4 of the frosting self-cleaning mode, and the frosting self-cleaning mode is exited, and the frosting stage is entered to complete the self-cleaning process. The detection period of the current evaporation temperature Te may be set according to the actual situation, and is not limited thereto.
In some embodiments, when the current evaporating temperature Te is determined to be smaller than the sixth preset temperature T6, it is indicated that the current evaporating temperature Te is too low, so that the suction pressure in the current air conditioner is lower than the limit of the minimum allowable suction pressure specified in the specification of the compressor, and therefore the operation frequency of the compressor is controlled to be reduced, or the opening degree of the expansion valve is controlled to be increased, so that the current evaporating temperature Te is improved, the situation that the suction pressure in the air conditioner is lower than the minimum allowable suction pressure requirement is avoided, and the reliability of the compressor is improved, wherein the sixth preset temperature T6 is the lower limit value of the self-cleaning temperature range of the condensed water; when the current evaporating temperature Te is determined to be higher than the seventh preset temperature T7, the fact that the current evaporating temperature Te is too high cannot meet the requirement of rapid frosting is indicated, so that the operation frequency of the compressor is controlled to be increased, or the opening of the expansion valve is controlled to be reduced, and the effect of rapid frosting is achieved, wherein the seventh preset temperature T7 is the upper limit value of the self-cleaning temperature range of the condensed water; however, when the current evaporating temperature Te is determined to be greater than or equal to the sixth preset temperature T6 and less than or equal to the seventh preset temperature T7, the current evaporating temperature Te is indicated to not only meet the reliability requirement of the compressor, but also be capable of rapidly frosting, so that the running frequency of the compressor and the opening of the expansion valve are controlled to be unchanged, the current evaporating temperature Te is in a frosting self-cleaning temperature range, the purpose of rapidly frosting is achieved while the reliability requirement of the compressor is met, and the high-efficiency self-cleaning of the air conditioner is realized.
Regarding the sixth preset temperature T6 and the seventh preset temperature T7, considering that the lower the evaporation temperature is, the faster the frost crystal is generated, and the limitation of the minimum allowable suction pressure specified in the compressor specification, in the embodiment of the present invention, the value range of the sixth preset temperature T6 and the value range of the seventh preset temperature T7 are set as follows: -25 ℃ to less than or equal to a sixth preset temperature T6 to less than or equal to-23 ℃ and-23 ℃ to less than or equal to a seventh preset temperature T7 to less than or equal to-15 ℃, e.g., the sixth preset temperature T6 may be-25 ℃ or-24.5 ℃ or-23 ℃, the seventh preset temperature T7 may be-23 ℃ or-15.5 ℃ or-15 ℃, preferably, the sixth preset temperature T6 is-24 ℃ and the seventh preset temperature T7 is-20 ℃. Therefore, the outdoor heat exchanger can be rapidly realized to maximize frost formation, and the reliability requirement of the compressor can be met.
In addition, considering that in the frosting self-cleaning mode, the outdoor motor is stopped to radiate heat to the power module, so that the temperature of the power module easily exceeds a reliable temperature point of the outdoor motor, and the risk of burning or breakdown of the power module is caused.
For the process of operating the frosting self-cleaning mode of the air conditioner, before controlling at least one of the operating frequency of the compressor and the opening degree of the expansion valve according to the current evaporation temperature, the operating frequency of the compressor is controlled according to the current temperature of the power module by acquiring the current temperature of the power module for driving the compressor so that the current temperature of the power module is in the safe operating temperature range.
In the frosting self-cleaning mode, the outdoor fan is controlled to stop running in order to frost the outdoor heat exchanger, so that the embodiment of the invention only adjusts the current temperature T0 of the power module by controlling the running frequency of the compressor when the air conditioner runs in the frosting self-cleaning mode, so that the current temperature T0 of the power module is in a safe working temperature range, and the reliability of the power module is ensured. Specifically, in the air conditioner operation frosting self-cleaning mode, when the current temperature T0 of the power module is determined to be greater than the preset temperature threshold value of the power module, the operation frequency of the compressor is controlled to be reduced, so that the operation current in the power module can be reduced, the heating value of the power module is reduced, and the purpose of reducing the current temperature T0 of the power module is achieved.
It will be appreciated that, considering that the current temperature T0 of the power module needs to be in the safe operating temperature range, when determining that the current evaporating temperature Te is greater than the seventh preset temperature T7, if the current evaporating temperature Te is adjusted in a manner of controlling the operation frequency of the compressor to increase, the current temperature T0 of the power module is increased, so, to ensure the reliability of the power module, after determining that the current evaporating temperature Te is greater than the seventh preset temperature T7, if the current temperature T0 of the power module reaches the critical value of the safe operating temperature range, the current evaporating temperature Te may be adjusted only in a manner of controlling the opening degree of the expansion valve to decrease, so that the current temperature T0 of the power module is also controlled in the safe operating temperature range while the current evaporating temperature Te is in the frosting self-cleaning range. Meanwhile, in order to prevent the opening degree of the expansion valve from being excessively small in the process of adjusting the current evaporation temperature Te in such a manner as to control the opening degree of the expansion valve to decrease, a minimum opening degree of the expansion valve needs to be set to, for example, 100 steps, that is, the opening degree of the expansion valve is limited to be greater than or equal to 100 steps in the process of closing the expansion valve.
The frosting self-cleaning mode according to the embodiment of the present invention is illustrated with reference to fig. 6, and the following details are given.
Step S34, frosting self-cleaning mode.
In step S35, the rotational speed of the indoor motor is the second preset rotational speed R2 (0).
In step S36, the operating frequency of the compressor is the second initial frequency F2 (0).
Step S37, the outdoor motor stops running.
In step S38, the opening of the expansion valve is the second preset opening EEV2 (0).
In step S39, it is determined whether the continuous operation time t of the compressor reaches the second preset time t3min. If yes, go to step S40; if not, step S39 is performed.
Step S40, frosting process.
Step S41, judging whether the time of the frosting stage reaches the preset cleaning time t4min of the frosting self-cleaning mode. If yes, go to step S42; if not, step S40 is performed. The preset cleaning time of the frosting self-cleaning mode is the time for completing the self-cleaning process in the preset frosting self-cleaning mode.
Step S42, the frosting self-cleaning mode is ended.
The frosting process of the above step S40 is described in detail with reference to fig. 7, and the details are as follows.
Step S43, frosting process.
Step S44, judging whether the current temperature T0 of the power module is smaller than a preset temperature threshold of the power module. If not, executing step S45; if yes, go to step S47.
In step S45, the operation frequency of the compressor is controlled to decrease to adjust the current temperature T0 of the power module, such that the current temperature T0 of the power module is less than the preset temperature threshold of the power module.
Step S46, detecting the current temperature T0 of the power module again after the delay of T5 seconds, that is, periodically detecting the current temperature T0 of the power module with T5S as a detection period, until the current temperature T0 of the power module is less than or equal to the preset temperature threshold of the power module, and indicating that the current temperature T0 of the power module is in the safe working temperature range.
Step S47, the current evaporating temperature Te is obtained, and it is determined whether the current evaporating temperature Te is in the frosting self-cleaning temperature range [ T6, T7]. If the temperature is within the frosting self-cleaning temperature range, step S48 is performed.
And step S48, controlling the operation frequency of the compressor and the opening degree of the expansion valve to be unchanged.
In step S49, if the current evaporating temperature Te is less than the sixth preset temperature T6, at least one of the decrease in the operating frequency of the compressor and the increase in the opening degree of the expansion valve is controlled.
Step S50, if the current evaporating temperature Te is larger than the seventh preset temperature T7, controlling at least one of the operation frequency increase of the compressor and the opening degree reduction of the expansion valve.
The following describes the operation of the air conditioner in the frosting self-cleaning mode according to the embodiment of the present invention with specific values.
For example, the preset relevant parameters in the air conditioner are respectively: the second preset time T3 is 5min, the first preset temperature T1 is 27 ℃, the second preset temperature T2 is 16 ℃, the third preset temperature T3 is 14 ℃, the preset temperature threshold of the power module is 85 ℃, the maximum allowable rotation speed max is 1500rpm, the sixth preset temperature T6 is-24 ℃, the seventh preset temperature T7 is-20 ℃, the detection period T5 of the current temperature T0 is 10s, the preset time threshold T6 is 20s, the preset cleaning time T4 of the frosting self-cleaning mode is 20min, the second preset rotation speed R2 (0) is 2 gear, the second initial frequency F2 (0) is 70Hz, and the second preset opening EEV2 (0) is 200 steps.
Based on the setting parameters of the air conditioner, a user starts an outdoor self-cleaning function of the air conditioner, the controller firstly controls the outdoor motor to rotate reversely at a high speed of 1500rpm, and after the running time of the outdoor motor reaches 20 seconds, the outdoor motor is stopped. Further, the outdoor ambient temperature Tout is detected, and assuming that the outdoor ambient temperature is detected to be 7 ℃ and less than T2, the frosting self-cleaning mode is performed. The indoor controller sends a heating mode to the outdoor controller and controls the indoor motor to run at 2 gears and the indoor air deflector to move to a direct blowing preventing position; the outdoor unit performs a heating mode, the compressor is operated at a second initial frequency of F2 (0) =70 Hz, the opening EEV2 (0) =200 steps of the expansion valve, and the outdoor motor is stopped. After the compressor is started and continuously runs for 5min, detecting the current temperature of the power module to be 54 ℃ < 85 ℃, detecting the current evaporating temperature Te= -10 ℃ to be more than T7, controlling the running frequency of the compressor to be increased by 2Hz on the basis of the second initial frequency of F2 (0), namely, the compressor is operated at 72Hz, detecting the current temperature of the power module to be 56 ℃ < 85 ℃ after the running time of the compressor reaches the detection period of 10s, detecting the current evaporating temperature Te= -12 ℃ to be more than T7 again, and controlling the running frequency of the compressor to be increased by 2Hz on the basis of 72Hz, namely, the compressor is operated at 74 Hz; the circulation is performed in this way until the current temperature of the power module is 86 ℃ to 85 ℃, and the compressor is controlled to reduce by 2Hz on the basis of the current operating frequency; after the running time of the compressor reaches the detection period of 10s, detecting the current temperature of the power module to be 84 ℃ less than 85 ℃, detecting the current evaporating temperature Te= -18 ℃ more than T7 again, and controlling the opening of the expansion valve to be reduced by 10 steps on the basis of 200 steps, namely, the opening of the expansion valve is 190 steps; after a plurality of detection periods, detecting the current evaporating temperature Te= -21 ℃ less than T7, and at the moment, controlling the running frequency of the compressor, the opening of the expansion valve, the rotating speed of the outdoor motor and the like to be unchanged when the current temperature of the power module is less than 85 ℃, until the running time T of the compressor is more than or equal to 20min, exiting the frosting stage, entering the frosting stage to quickly melt the frost into water to wash out dust, thereby completing a frosting self-cleaning mode and realizing self-cleaning of the air conditioner.
In the embodiment of the present invention, when the operating frequency of the compressor is controlled to increase or decrease, the range of the variation amplitude of the operating frequency of the compressor is [0.5Hz,20Hz ], for example, when the operating frequency of the compressor is controlled to increase, the amplitude of each increase of the operating frequency is 0.5Hz, 10Hz or 20Hz. And the range of the variation amplitude of the opening of the expansion valve is [1 step, 100 steps ] when the opening of the expansion valve is controlled to be increased or decreased, for example, the amplitude of each increase of the opening is 1 step, 10 steps, or 100 steps when the opening of the expansion valve is controlled to be increased.
In summary, according to the self-cleaning control method for the outdoor heat exchanger, according to the embodiment of the invention, in response to the self-cleaning instruction, the outdoor motor is controlled to reversely run to primarily clean the outdoor heat exchanger, so that floccules or large-particle dust attached to the outdoor heat exchanger are blown off, on the basis, the self-cleaning indoor heat exchanger is realized by judging that the air conditioner executes the frosting and defrosting process through the outdoor environment temperature and the dew-point temperature in combination with the reliability of the compressor, or the self-cleaning function is realized by executing high condensation water to directly wash the indoor heat exchanger, so that the self-cleaning function is realized in accordance with the optimal self-cleaning mode of the current environment, the high-efficiency self-cleaning of the air conditioner is realized, and the self-cleaning effect of the air conditioner is improved. And in the process of running the condensed water self-cleaning mode or the frosting self-cleaning mode, the air conditioner can effectively ensure the reliability of the power module by controlling the current temperature of the power module within a safe working temperature range and can control the current evaporation temperature to meet the self-cleaning temperature range, thereby realizing the self-cleaning function of the outdoor heat exchanger while ensuring the reliability of the power module.
An embodiment of the second aspect of the present invention proposes an air conditioner 10, as shown in fig. 8, the air conditioner 10 comprising a temperature sensor 1, a processor 2 and a memory 3 communicatively connected to at least one processor 2.
The temperature sensor 1 is used for collecting outdoor environment temperature; the memory 3 stores therein a computer program executable by the at least one processor 2, and the at least one processor 2 implements the self-cleaning control method for the outdoor heat exchanger provided in the above-described embodiment when executing the computer program.
It should be noted that, the specific implementation manner of the air conditioner 10 according to the embodiment of the present invention is similar to the specific implementation manner of the self-cleaning control method of the outdoor heat exchanger according to any of the embodiments of the present invention, please refer to the description of the method section specifically, and in order to reduce redundancy, the description is omitted here.
According to the air conditioner 10 of the embodiment of the invention, the self-cleaning effect can be improved by the processor 2 adopting the self-cleaning control method of the outdoor heat exchanger provided by the embodiment.
An embodiment of a third aspect of the present invention provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the self-cleaning control method for an outdoor heat exchanger provided in the above embodiment.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means 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, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The self-cleaning control method of the outdoor heat exchanger is characterized by comprising the following steps of:
responding to the self-cleaning instruction, and controlling the outdoor motor to reversely run;
detecting that the outdoor motor meets a pre-cleaning condition, and controlling the outdoor motor to stop running;
the detecting that the outdoor motor satisfies a pre-cleaning condition includes: the running time of the outdoor motor reaches a preset time threshold value, and the outdoor motor is determined to meet the pre-cleaning condition; or when the running current of the outdoor motor is smaller than a preset current threshold value, determining that the outdoor motor meets the pre-cleaning condition;
Acquiring outdoor environment temperature;
controlling the air conditioner to operate in a condensed water self-cleaning mode or a frosting self-cleaning mode according to the outdoor environment temperature;
controlling the air conditioner to operate in a condensate self-cleaning mode, comprising:
controlling the air conditioner to operate in a heating mode;
controlling an indoor motor to run at an initial rotating speed, controlling an indoor air deflector to move to an anti-direct blowing position, controlling a compressor to run at a first initial frequency, controlling the opening of an expansion valve to be a first preset opening, and controlling an outdoor motor to run at the first preset rotating speed;
the time that the compressor runs at the first initial frequency reaches a first preset time;
acquiring the current evaporation temperature;
and controlling at least one of the operating frequency of the compressor and the opening degree of the expansion valve according to the current evaporation temperature so that the current evaporation temperature is in a condensed water self-cleaning temperature range.
2. The method of controlling self-cleaning of an outdoor heat exchanger according to claim 1, wherein controlling reverse operation of the outdoor motor comprises:
and controlling the outdoor motor to reversely operate at the maximum allowable rotating speed.
3. The method for controlling the self-cleaning of an outdoor heat exchanger according to claim 1, wherein controlling the air conditioner to operate in a condensed water self-cleaning mode or a frosting self-cleaning mode according to the outdoor ambient temperature comprises:
Determining that the outdoor environment temperature is greater than or equal to a first preset temperature, and controlling the air conditioner to operate in the condensate water self-cleaning mode;
determining that the outdoor environment temperature is less than or equal to a second preset temperature, and controlling the air conditioner to operate in the frosting self-cleaning mode;
and determining that the outdoor environment temperature is smaller than the first preset temperature and larger than the second preset temperature, acquiring the outdoor environment relative humidity, and controlling the air conditioner to operate in a condensed water self-cleaning mode or a frosting self-cleaning mode according to the outdoor environment temperature and the outdoor environment relative humidity.
4. The method of controlling self-cleaning of an outdoor heat exchanger according to claim 3, wherein controlling the air conditioner to operate in a condensed water self-cleaning mode or a frosting self-cleaning mode according to the outdoor environment temperature and the outdoor environment relative humidity, comprises:
obtaining a dew point temperature according to the outdoor environment temperature and the outdoor environment relative humidity;
determining that the dew point temperature is greater than or equal to a third preset temperature, and controlling the air conditioner to operate in the condensed water self-cleaning mode;
and determining that the dew point temperature is smaller than the third preset temperature, and controlling the air conditioner to operate in the frosting self-cleaning mode.
5. The outdoor heat exchanger self-cleaning control method according to claim 1, characterized in that the controlling at least one of an operating frequency of the compressor and an opening degree of the expansion valve according to the current evaporation temperature includes:
if the current evaporation temperature is determined to be smaller than a fourth preset temperature, controlling the running frequency of the compressor to be reduced or controlling the opening degree of the expansion valve to be increased, wherein the fourth preset temperature is the lower limit value of the self-cleaning temperature range of the condensed water;
if the current evaporation temperature is determined to be greater than a fifth preset temperature, controlling the running frequency of the compressor to rise, or controlling the opening degree of the expansion valve to be reduced, wherein the fifth preset temperature is the upper limit value of the self-cleaning temperature range of the condensed water;
and if the current evaporation temperature is determined to be greater than or equal to the fourth preset temperature and less than or equal to the fifth preset temperature, controlling the running frequency of the compressor and the opening of the expansion valve to be unchanged.
6. The method for controlling the self-cleaning of an outdoor heat exchanger according to claim 1, wherein controlling the air conditioner to operate in the frosting self-cleaning mode comprises:
Controlling the air conditioner to operate in a heating mode;
controlling an indoor motor to run at a second preset rotating speed, controlling an indoor air deflector to move to an anti-direct blowing position, controlling a compressor to run at a second initial frequency, controlling the opening of an expansion valve to be a second preset opening, and controlling the outdoor motor to stop running;
the time that the compressor runs at the second initial frequency reaches a second preset time;
acquiring the current evaporation temperature;
and controlling at least one of the operating frequency of the compressor and the opening degree of the expansion valve according to the current evaporation temperature so that the current evaporation temperature is in a frosting self-cleaning temperature range.
7. The outdoor heat exchanger self-cleaning control method according to claim 6, characterized in that said controlling at least one of an operating frequency of said compressor and an opening degree of said expansion valve according to said current evaporation temperature includes:
if the current evaporation temperature is less than a sixth preset temperature, controlling the running frequency of the compressor to be reduced or controlling the opening degree of the expansion valve to be increased, wherein the sixth preset temperature is the lower limit value of the frosting self-cleaning temperature range;
if the current evaporation temperature is determined to be greater than a seventh preset temperature, controlling the operation frequency of the compressor to be increased or controlling the opening degree of the expansion valve to be reduced, wherein the seventh preset temperature is the upper limit value of the frosting self-cleaning temperature range;
And if the current evaporation temperature is determined to be greater than or equal to the sixth preset temperature and less than or equal to the seventh preset temperature, controlling the operation frequency of the compressor and the opening of the expansion valve to be unchanged.
8. The outdoor heat exchanger self-cleaning control method according to claim 1 or 6, characterized in that the method further comprises:
acquiring a current temperature of a power module for driving the compressor before controlling at least one of an operation frequency of the compressor and an opening degree of the expansion valve according to the current evaporation temperature;
and controlling at least one of the operating frequency of the compressor and the rotating speed of the outdoor motor according to the current temperature of the power module so that the current temperature of the power module is in a safe operating temperature range.
9. An air conditioner, comprising:
the temperature sensor is used for collecting outdoor environment temperature;
at least one processor;
a memory communicatively coupled to at least one of the processors;
wherein the memory stores therein a computer program executable by at least one of the processors, the at least one of the processors implementing the outdoor heat exchanger self-cleaning control method according to any one of claims 1 to 8 when executing the computer program.
10. A computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the self-cleaning control method of an outdoor heat exchanger according to any one of claims 1 to 8.
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