CN111981640B - Defrosting control method and device, air conditioner and storage medium - Google Patents

Defrosting control method and device, air conditioner and storage medium Download PDF

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Publication number
CN111981640B
CN111981640B CN202010837599.XA CN202010837599A CN111981640B CN 111981640 B CN111981640 B CN 111981640B CN 202010837599 A CN202010837599 A CN 202010837599A CN 111981640 B CN111981640 B CN 111981640B
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value
preset
fan
difference
current
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CN111981640A (en
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韩劼成
胡志文
孙义文
应必业
原惠惠
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • 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
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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
    • F24F11/873—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling refrigerant heaters
    • 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
    • F24F11/88—Electrical aspects, e.g. 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
    • 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

Abstract

The invention provides a defrosting control method and device, an air conditioner and a storage medium. The defrosting control method comprises the following steps: after the air conditioner starts a heating mode, acquiring a current stable value of an external fan, and detecting the current value of the external fan according to a preset period; judging whether the air conditioner enters a defrosting stage or not according to the difference value between the current stable value of the outer fan and the current value of the outer fan in two adjacent times and the running time of a compressor; after the air conditioner enters a defrosting stage, the air conditioner operates in a refrigerating mode to obtain a difference value between the outdoor environment temperature and the indoor temperature; and judging whether to start the electric auxiliary heater and the inner fan according to the difference value between the outdoor environment temperature and the indoor temperature. The invention adopts the mode of judging the difference value between the current stable value and the real-time current value of the two continuous external fans, the judging method is more accurate, the frequent entering of a defrosting program due to factors such as external voltage fluctuation is avoided, the defrosting stage time is shortened by starting the electric auxiliary heater and the internal fan, and the low-temperature heating capacity is improved.

Description

Defrosting control method and device, air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method and device, an air conditioner and a storage medium.
Background
Outdoor temperature is low in winter, when air conditioning hot operation is carried out, the outdoor unit can have a frosting phenomenon, and a heating process at low temperature comprises a frosting stage and a defrosting stage, and is an unsteady-state operation process. In the defrosting stage, the four-way valve of the air conditioner is reversed, the air conditioner running mode is switched from the heating mode to the cooling mode, theoretically, no heating quantity is output indoors, and in order to improve the indoor heating quantity at low temperature and improve the comfort of the indoor environment, the air conditioner needs to be subjected to timely and effective defrosting.
Disclosure of Invention
The invention aims to provide a defrosting control method which can accurately judge frosting in time and quickly shorten defrosting stage time so as to improve indoor heating capacity and improve user experience effect.
In order to solve the above problems, the present invention provides a defrosting control method, including:
after the air conditioner starts a heating mode, acquiring a current stable value of an external fan, and detecting the current value of the external fan according to a preset period;
judging whether the air conditioner enters a defrosting stage or not according to the difference value between the current stable value of the outer fan and the current value of the outer fan in two adjacent times and the running time of a compressor;
after the air conditioner enters a defrosting stage, controlling the air conditioner to operate in a refrigerating mode, and acquiring an outdoor ambient temperature and an indoor temperature difference, wherein the indoor temperature difference is a difference between an indoor set temperature and an indoor ambient temperature;
and judging whether to start the electric auxiliary heat device and the inner fan according to the difference value between the outdoor environment temperature and the indoor temperature.
The invention adopts the mode of judging the difference value between the current stable value and the real-time current value of the two continuous external fans, the judging method is more accurate, the frequent entering of a defrosting program due to factors such as external voltage fluctuation is avoided, the running time of the compressor is used as the judging condition for judging whether the air conditioner enters a defrosting stage, the judging accuracy is further improved, and the air conditioner can carry out defrosting treatment in time. In addition, the invention also shortens the defrosting stage time by starting the electric auxiliary heater and the internal fan, and improves the low-temperature heating capacity.
Further, the step of judging whether to enable the air conditioner to enter a defrosting stage according to the difference between the current stability value of the external fan and the current values of the two adjacent external fans and the running time of the compressor comprises the following steps:
acquiring current values of the external fan twice before and after a preset period;
acquiring a first difference value between the stable value of the external fan current and the external fan current value before a preset period, and comparing the magnitude of the first difference value with a preset difference value;
when the first difference value is larger than the preset difference value, acquiring a second difference value between the external fan current stable value and the external fan current value after a preset period, and acquiring a ratio of the first difference value to the second difference value;
when the ratio of the first difference to the second difference is smaller than 1, acquiring the running time of the compressor;
and when the running time of the compressor is greater than the preset running time, controlling the air conditioner to enter a defrosting stage.
According to the invention, the air conditioner enters the defrosting stage by meeting the three conditions that the first difference is greater than the preset difference, the ratio of the first difference to the second difference is less than 1 and the running time of the compressor is greater than the preset running time, so that the misjudgment caused by external factors is avoided, whether the heat exchanger on the outer side of the air conditioner frosts can be more accurately judged, the defrosting treatment is timely carried out, and the actual use scene and the actual use condition are better met.
Further, still include: and when the ratio of the first difference value to the second difference value is less than 1, acquiring the running time of the compressor, acquiring the relative humidity of the external environment, and adjusting the preset running time according to the relative humidity of the external environment.
Further, the adjusting the preset operation time according to the external environment relative humidity includes:
when the relative humidity of the external environment is smaller than or equal to a preset humidity value, the preset running time is a first preset running time;
and when the relative humidity of the external environment is greater than the preset humidity value, the preset operation time is a second preset operation time, wherein the first preset operation time is greater than the second preset operation time.
According to the invention, the judgment condition for changing the defrosting degree is selected according to the outdoor real-time relative humidity condition, so that the heating capacity is improved to a greater extent under different external environment working conditions, and the comfort of a user is improved.
Further, the obtaining mode of the current stable value of the outer fan is as follows: and when the running time of the outer fan reaches the set time, taking the current of the outer fan acquired at the moment as the current stable value of the outer fan.
Further, the judging whether to start the electric auxiliary heating device and the inner fan according to the outdoor environment temperature and the indoor temperature difference comprises:
when the outdoor environment temperature is less than or equal to the outer ring preset value, the electric auxiliary heat device and the inner fan are started, and the inner fan runs in a reverse mode;
when the outdoor environment temperature is higher than the outer ring preset value, judging whether to start the electric auxiliary heat device and the inner fan or not according to the indoor temperature difference;
the judging whether to start the electric auxiliary heating device and the inner fan according to the indoor temperature difference comprises the following steps:
when the indoor temperature difference is larger than the inner ring preset value, the electric auxiliary heating device is started, and the inner fan is closed;
and when the indoor temperature difference is smaller than or equal to the inner ring preset value, the electric auxiliary heating device and the inner fan are closed.
According to the invention, whether the electric auxiliary heater and the inner fan are turned on or not is selected according to the difference value of the outdoor environment temperature and the indoor temperature in the defrosting stage, so that the defrosting stage time is shortened, and the user comfort is improved.
Further, when the outdoor environment temperature is less than or equal to the outer ring preset value, turning on the electric auxiliary heating device and the inner fan comprises:
when the outdoor environment temperature is less than or equal to a first outer ring preset value and greater than a second outer ring preset value, only starting the electric auxiliary heat device;
and when the outdoor environment temperature is less than or equal to the second outer ring preset value, the electric auxiliary heat device and the inner fan are started.
The invention optimizes the opening of the electric auxiliary heating device and the inner fan according to the actual condition of the outdoor environment, and when the outdoor environment is severe, the electric auxiliary heating device is opened. When the outdoor environment is very severe, the electric auxiliary heating device and the inner fan are started to accelerate defrosting.
Another object of the present invention is to provide a defrosting control apparatus, including:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a stable value of the current of the external wind turbine and acquiring the current value of the external wind turbine according to a preset period;
the acquiring unit is also used for acquiring the difference value between the outdoor environment temperature and the indoor temperature;
the control unit is used for judging whether the air conditioner enters a defrosting stage or not according to the difference value between the current stable value of the outer fan and the current value of the outer fan at two adjacent times and the running time of the compressor;
the control unit is also used for controlling the air conditioner to operate in a refrigeration mode after entering a defrosting stage;
the control unit is also used for judging whether to start the electric auxiliary heater and the inner fan according to the outdoor environment temperature and the indoor temperature difference value.
The present invention also provides an air conditioner comprising a computer readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the defrosting control method as described above.
The present invention also provides a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the defrost control method as described above.
Compared with the prior art, the defrosting control device and the air conditioner provided by the invention have the same beneficial effects as the defrosting control method, and are not repeated herein.
Drawings
FIG. 1 is a flow chart of a defrost control method in an embodiment of the present invention;
FIG. 2 is an overall flowchart of a defrost control method in an embodiment of the present invention;
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 and 2, an embodiment of the present invention provides a defrosting control method, including: after the air conditioner starts a heating mode, acquiring a current stable value of an external fan, and detecting the current value of the external fan according to a preset period;
judging whether the air conditioner enters a defrosting stage or not according to the change of the difference value between the current stable value of the external fan and the current value of the two adjacent external fans and the running time of the compressor;
after the air conditioner enters a defrosting stage, controlling the air conditioner to operate in a refrigerating mode, and acquiring a difference value between the outdoor environment temperature and the indoor temperature;
and judging whether to start the electric auxiliary heater and the inner fan according to the difference value between the outdoor environment temperature and the indoor temperature.
After the air conditioner is heated and operated for a period of time, the condenser of the outer unit frosts, the frost layer can block gaps among fins of the outer unit, so that the air volume passing through the condenser can be reduced, the current of the outer fan can be correspondingly reduced, and whether the outer fan frosts can be judged according to the current value of the outer fan. The conventional judgment method comprises the steps of obtaining a difference value between a real-time current value and a current stable value of the external fan, judging whether the difference value meets a preset difference value or not, or detecting current values of the external fan at two different times, and judging according to a ratio or the difference value between the two real-time current values. However, these determination methods are prone to cause erroneous determination, for example, when a large number of users use high-power devices such as air conditioners in the same time period, the voltage used is prone to be unstable, and in the case that the voltage is unstable, even if the external fan is not frosted, the determination method may also meet the set determination condition, for example, the difference between the real-time current value of the external fan and the current stabilization value is called a real-time difference value, the determination is performed according to the magnitude between the real-time difference value and the preset difference value, and if the real-time current value of the external fan is reduced due to the unstable voltage, the real-time difference value is larger than the preset difference value, so that the erroneous determination is caused, the air conditioner frequently enters the defrosting program, and the service life of the air conditioner and the user experience are affected. Similarly, if the judgment is performed according to the ratio or the difference between the two real-time current values, the change of the next real-time current value relative to the previous real-time current value may be caused by frosting, and may also be caused by other external conditions such as unstable voltage, and therefore, the method is also easy to cause erroneous judgment.
In this embodiment, the external wind turbine current value is detected according to a preset period to obtain a series of external wind turbine current values, for example, the current external wind turbine current value is recorded as aNAnd the current value of the external fan after the preset period is recorded as AN+1The difference between the current stable value of the external wind turbine and the current value of the external wind turbine detected twice is used, namely the current stable value of the external wind turbine and the current value A of the external wind turbineNFor convenience of explanation, the difference between the current value and the current value A of the external fan after the preset period is referred to as a first difference, and the current stability value of the external fan and the current value A of the external fan after the preset periodN+1The difference between them is referred to as the second difference for the sake of convenience of description. And judging the change trend of the current value of the external fan according to the change trends of the first difference and the second difference, thereby judging whether the air conditioner enters a defrosting stage.
In the embodiment, the difference between the real-time current value of the external fan and the current stable value is determined for two consecutive times, if the real-time current value of the external fan changes due to unstable voltage (generally, the real-time current value of the current external fan decreases), the real-time current value of the external fan decreases for two consecutive times, the difference between the current stable value and the real-time current value of the two consecutive times is almost the same, and the difference is not changed, so that the defrosting stage cannot be entered due to the fact that the set determination condition is met, and therefore misdetermination due to unstable voltage can be eliminated. Therefore, the judging method is more accurate, frequent entering of a defrosting program due to factors such as external voltage fluctuation is avoided, and actual use scenes and application conditions are better met. In addition, the present embodiment further uses the operation time of the compressor as a determination condition for determining whether the air conditioner enters the defrosting stage, so as to further improve the accuracy of the determination, and enable the air conditioner to perform defrosting treatment in time.
In addition, this embodiment still judges whether to open electricity and assist heat and interior fan according to outdoor ambient temperature and indoor temperature difference after getting into the defrosting stage, shortens the defrosting stage time through opening electricity and assisting heat and interior fan, has promoted the low temperature heating volume.
Optionally, the obtaining manner of the current stabilization value of the external wind turbine is as follows: when the air conditioner receives the heating operation signal, the controller controls the operation of the outer fan, and when the operation time of the outer fan reaches the set time, the current value of the outer fan obtained at the moment is used as the current stable value A of the outer fanS. Preferably, the set time is 3-5 min. It should be understood that, after the operation time of the external fan reaches the set time, the controller starts to detect the current value of the external fan according to the preset period, and it should be further understood that the controller may detect the current value of the external fan immediately after the operation of the external fan is set time for the first time, or may detect the current value of the external fan after waiting for a period of time after the operation of the external fan is set time, for example, obtaining the current stability value of the external fan when the external fan operates for 5min, then waiting for a period of time to detect the current value of the external fan for the first time, and then detecting the current value of the external fan for the next time according to the preset period.
Optionally, the determining whether to enable the air conditioner to enter the defrosting stage according to the change of the difference value between the stable value of the external fan current and the two adjacent external fan current values and the running time of the compressor comprises:
obtaining the current values of the external wind turbine twice before and after the preset period, and respectively recording the current values as ANAnd AN+1Wherein A isNIs the value of the external fan current before the preset period, AN+1The current value is an external fan current value after a preset period, in this embodiment, the preset period is preferably 5s, for example, the external fan current value a is obtained at the current momentNAnd obtaining the current value A of the external fan after 5sN+1；
Obtaining the current stable value A of the external fanSThe current value A of the external fan before the preset periodNA first difference Δ A therebetween1And comparing the magnitude of the first difference with a preset difference;
when the first difference value is larger than the preset difference value, obtaining the stable value A of the current of the outer fanSThe current value A of the external fan after the preset periodN+1A second difference Δ A therebetween2And obtaining the ratio of the first difference value to the second difference value;
when the ratio of the first difference to the second difference is smaller than 1, acquiring the running time of the compressor;
and when the running time of the compressor is greater than the preset running time, the controller controls the air conditioner to enter a defrosting stage.
In this embodiment, when it is detected that the first difference is greater than the preset difference, it is indicated that the external blower current is reduced at this time, and the external blower condenser may frost, and according to the analysis, it is also possible that the external blower current is reduced due to external conditions such as voltage instability, and the like, therefore, in this embodiment, the real-time external blower current value after the preset period is continuously obtained, the second difference is calculated, and when the ratio of the first difference to the second difference is less than 1, it is indicated that the second difference is greater than the first difference, and the real-time external blower current value after the preset period is further reduced compared with the external blower current value before the preset period, thereby excluding the possibility that the external blower current value before the preset period is reduced due to external conditions such as voltage instability. It should be understood that when the ratio of the first difference to the second difference is greater than or equal to 1, the detection of the external fan current value is continued for a preset period. Further, the embodiment also judges whether the running time of the compressor meets the preset running time or not so as to ensure that the compressor has continuously heated and run for more than a certain time and ensure that the frosting condition required to be defrosted is met.
The embodiment simultaneously satisfies the three conditions that the first difference value is greater than the preset difference value, the ratio of the first difference value to the second difference value is less than 1 and the running time of the compressor is greater than the preset running time, and the three conditions are used as the conditions for the air conditioner to enter the defrosting stage, so that misjudgment caused by external factors is avoided, whether the heat exchanger on the outer side of the air conditioner frosts can be judged more accurately, defrosting treatment can be carried out timely, meanwhile, the probability of misjudgment can be reduced, the judgment method is more accurate, and actual use scenes and conditions are better met. It should be understood that, when the above-mentioned three conditions that the first difference is greater than the preset difference, the ratio of the first difference to the second difference is less than 1, and the operation time of the compressor is greater than the preset operation time cannot be simultaneously satisfied, the air conditioner may enter the normal heating operation stage.
Optionally, when the ratio of the first difference to the second difference is smaller than 1, obtaining the compressor running time, further includes: and acquiring the relative humidity of the external environment, adjusting the preset operation time according to the relative humidity of the external environment, and judging whether the operation time of the compressor is greater than the preset operation time.
Wherein, adjusting the preset operation time according to the external environment relative humidity comprises:
when the relative humidity of the external environment is smaller than or equal to a preset humidity value, the preset operation time is a first preset operation time;
and when the relative humidity of the external environment is greater than the humidity preset value, the preset operation time is a second preset operation time, wherein the first preset operation time is greater than the second preset operation time.
In this embodiment, the first predetermined time is preferably 30-40min, and the second predetermined time is preferably 20-29 min. The humidity preset value is preferably 60% -75%.
In order to improve the heating capacity of the air conditioner, the heating operation time is generally increased as much as possible, that is, the operation time of the compressor is as long as possible, but when the relative humidity of the external environment is high, the outdoor unit condenser is prone to frosting, and at this time, the judgment condition whether the operation time of the reused compressor meets the first preset operation time is not in accordance with the actual situation. Therefore, in the present embodiment, an outside humidity sensor is added, and the determination condition for entering the defrosting stage is selected in real time according to the outside actual environment condition.
When the first difference is larger than the preset difference and the ratio of the first difference to the second difference is smaller than 1, if the relative humidity of the external environment is smaller than or equal to the preset humidity value, the humidity of the external environment is not very bad, the heating operation time can be properly increased to improve the comfort, the first preset operation time is used as a judgment condition, and when the continuous heating operation time of the compressor is larger than the first preset time, the controller controls the air conditioner to enter a defrosting stage.
If the relative humidity of the external environment is greater than the preset humidity value, the humidity of the external environment is very bad at the moment, the outdoor condenser is easier to frost, at the moment, the second preset running time is used as a judgment condition, and after the continuous heating running time of the compressor is greater than the second preset time, the controller controls the air conditioner to enter a defrosting stage.
Compared with the conventional judging method, the judging method provided by the embodiment can avoid misjudgment caused by unstable voltage and the like, so that the air conditioner frequently enters a defrosting program to influence the service life of the air conditioner and the comfort of a user. On the other hand, the judgment condition for changing the defrosting degree can be selected according to the outdoor real-time environment condition (mainly referring to relative humidity), so that the heating capacity is improved to a greater extent under different external environment working conditions, and the comfort of a user is improved.
Optionally, when the air conditioner enters a defrosting stage, the four-way valve is reversed, and the air conditioner operation mode is a cooling mode. Acquiring an outdoor environment temperature and an indoor temperature difference value, and judging whether to start the electric auxiliary heating device and the inner fan according to the outdoor environment temperature and the indoor temperature difference value, wherein the method specifically comprises the following steps:
and acquiring the outdoor environment temperature, and judging whether the outdoor environment temperature is greater than the outer ring preset value, wherein the outer ring preset value is preferably-10-0 ℃. When the outdoor environment temperature is less than or equal to the outer ring preset value, the electric auxiliary heating device is started, the inner fan is started simultaneously, and the inner fan runs in a low-wind-gear reverse mode, so that heat exchange of a refrigerant in the pipeline can be enhanced through radiation heat dissipation and forced convection heat exchange, on one hand, the outdoor defrosting process is accelerated, the defrosting time is shortened, on the other hand, more liquid refrigerants can absorb heat and become gaseous, the situation that the liquid refrigerants are too much due to insufficient heat exchange is prevented, the storage limit of a liquid storage tank is exceeded, the liquid refrigerants enter the compressor, liquid impact is caused, and the compressor is damaged.
When the outdoor environment temperature is greater than the preset value of the outer ring, acquiring an indoor temperature difference value, and judging whether the indoor temperature difference value is greater than the preset value of the inner ring, wherein the indoor temperature difference value is the difference value between the indoor set temperature and the indoor environment temperature, the indoor environment temperature is detected by an inner ring sensor, and the preset value of the inner ring is preferably 0-3 ℃.
When the indoor temperature difference is larger than the inner ring preset value, the outdoor side temperature is higher, the indoor side temperature is lower, the electric auxiliary heating device is started, the cold energy dissipated by the refrigerant is offset by the heat of the electric auxiliary heating, and meanwhile, the inner fan is closed to prevent indoor cold air blowing.
When the indoor temperature difference is smaller than or equal to the inner ring preset value, the outdoor side temperature is higher, the indoor side temperature is also higher, and the electric auxiliary heating device and the inner fan are turned off.
This embodiment is according to the outdoor ambient temperature and the indoor temperature difference in the stage of changing the frost respectively with the size of default, and then whether select to open electric auxiliary heating and interior fan reversal, shortens the stage time of changing the frost, promotes user's travelling comfort.
Optionally, when the outdoor environment temperature is less than or equal to the outer ring preset value, turning on the electric auxiliary heating device and the inner fan includes:
and judging the outdoor environment temperature and the first outer ring preset value, wherein the outer ring preset value is preferably (-5) DEG C-0 ℃.
When the outdoor environment temperature is less than or equal to the first outer ring preset value, the electric auxiliary heating device is started, heat exchange of a refrigerant in the pipeline is enhanced through radiation heat dissipation of the electric auxiliary heating device, the outdoor defrosting process is accelerated, the defrosting time is shortened, meanwhile, the electric auxiliary heating device is started and can also exchange heat with the refrigerant, more liquid refrigerants absorb heat and become gaseous, insufficient heat exchange of the refrigerant is prevented, the liquid refrigerants are too much, the liquid refrigerants exceed the storage limit of the liquid storage tank, the liquid refrigerants enter the compressor, liquid impact is formed, and the compressor is damaged. It should be understood that if the outdoor ambient temperature is greater than the first outer ring preset value, the air conditioner is operated in the normal defrosting mode.
When the outdoor environment temperature is less than or equal to the first outer ring preset value, the outdoor environment temperature and the second outer ring preset value are continuously judged, the second outer ring preset value is less than the first outer ring preset value, and preferably, the outer ring preset value is (-10) DEG C to (-5) DEG C.
When the outdoor environment temperature is less than or equal to the second outer ring preset value, the outside environment temperature is very severe, the electric auxiliary heating device is started, the inner fan is also started at the same time, and the low wind gear of the inner fan runs in a reverse mode. The heat exchange efficiency of the refrigerant in the pipeline is improved through radiation heat dissipation and forced convection heat exchange, meanwhile, due to the fact that the electric auxiliary heat is started, the cold quantity dissipated by the refrigerant can be offset by the heat of the electric auxiliary heat, the inner fan runs in a reverse mode, and cold air cannot blow out. It should be understood that if the outdoor temperature is less than or equal to the first outer loop preset value and greater than the second outer loop preset value, the air conditioner turns on the electric auxiliary heating device.
According to the embodiment, the opening of the electric auxiliary heating device and the opening of the inner fan are optimized according to the actual situation of the outdoor environment, and when the outdoor environment temperature is low, namely the outdoor environment temperature is less than or equal to the first outer ring preset value and greater than the second outer ring preset value, the outdoor environment is severe at the moment, and the electric auxiliary heating device is opened. When the outdoor environment temperature is lower, namely the outdoor environment temperature is less than or equal to the second outer ring preset value, the outdoor environment is very severe at the moment, and the electric auxiliary heating device and the inner fan are started to accelerate defrosting.
According to the defrosting control method provided by the embodiment, whether a defrosting stage is started or not is judged according to the change of the difference value between the real-time current value of the outer fan and the stable current value of the outer fan twice continuously and the running time of the compressor, the judgment mode is more accurate, and defrosting by mistake can be effectively prevented. And then, judging whether to start the electric auxiliary heating device and the inner fan according to the comparison between the outdoor environment temperature and the indoor temperature difference value in the defrosting stage and a preset threshold value, so as to accelerate the defrosting progress, improve the indoor heat exchange amount and improve the comfort of users.
The present embodiment further provides a defrosting control device, configured to implement any one of the above defrosting control methods, including:
the acquiring unit is used for acquiring a stable value of the external fan current and acquiring the external fan current value according to a preset period; the acquisition unit is also used for acquiring the difference value between the outdoor ambient temperature and the indoor temperature;
the control unit is used for judging whether the air conditioner enters a defrosting stage or not according to the difference value between the current stable value of the external fan and the current value of the two adjacent external fans and the running time of the compressor;
the control unit is also used for controlling the air conditioner to operate in a refrigeration mode after entering a defrosting stage;
the control unit is also used for judging whether to start the electric auxiliary heater and the inner fan according to the outdoor environment temperature and the indoor temperature difference value.
The present embodiment also provides an air conditioner including a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the defrosting control method as described above.
The present embodiment also provides a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the defrost control method as described above.
Compared with the prior art, the defrosting control device and the air conditioner provided by the invention have the same beneficial effects as the defrosting control method, and are not repeated herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (9)

1. A defrost control method, comprising:
after the air conditioner starts a heating mode, acquiring a current stable value of an external fan, and detecting the current value of the external fan according to a preset period;
judging whether the air conditioner enters a defrosting stage according to the difference value between the current stable value of the outer fan and the current value of the outer fan at two adjacent times and the running time of the compressor, and specifically comprising the following steps:
acquiring current values of the external fan twice before and after a preset period;
acquiring a first difference value between the stable value of the external fan current and the external fan current value before a preset period, and comparing the magnitude of the first difference value with a preset difference value;
when the first difference value is larger than the preset difference value, acquiring a second difference value between the external fan current stable value and the external fan current value after a preset period, and acquiring a ratio of the first difference value to the second difference value;
when the ratio of the first difference to the second difference is smaller than 1, acquiring the running time of the compressor;
when the running time of the compressor is greater than the preset running time, controlling the air conditioner to enter a defrosting stage;
after the air conditioner enters a defrosting stage, controlling the air conditioner to operate in a refrigerating mode, and acquiring an outdoor ambient temperature and an indoor temperature difference, wherein the indoor temperature difference is a difference between an indoor set temperature and an indoor ambient temperature;
and judging whether to start the electric auxiliary heat device and the inner fan according to the difference value between the outdoor environment temperature and the indoor temperature.
2. The defrost control method of claim 1, further comprising: and when the ratio of the first difference value to the second difference value is less than 1, acquiring the running time of the compressor, acquiring the relative humidity of the external environment, and adjusting the preset running time according to the relative humidity of the external environment.
3. The defrost control method of claim 2, wherein said adjusting the preset run time based on the ambient relative humidity comprises:
when the relative humidity of the external environment is smaller than or equal to a preset humidity value, the preset running time is a first preset running time;
and when the relative humidity of the external environment is greater than the preset humidity value, the preset operation time is a second preset operation time, wherein the first preset operation time is greater than the second preset operation time.
4. The defrost control method according to any one of claims 1-3, wherein the stable value of the outer fan current is obtained by: and when the running time of the outer fan reaches the set time, taking the current of the outer fan acquired at the moment as the current stable value of the outer fan.
5. The defrosting control method according to any one of claims 1 to 3, wherein the determining whether to turn on the electric auxiliary heating device and the internal fan according to the difference between the outdoor ambient temperature and the indoor temperature includes:
when the outdoor environment temperature is less than or equal to the outer ring preset value, the electric auxiliary heat device and the inner fan are started, and the inner fan runs in a reverse mode;
when the outdoor environment temperature is higher than the outer ring preset value, judging whether to start the electric auxiliary heat device and the inner fan or not according to the indoor temperature difference;
the judging whether to start the electric auxiliary heating device and the inner fan according to the indoor temperature difference comprises the following steps:
when the indoor temperature difference is larger than the inner ring preset value, the electric auxiliary heating device is started, and the inner fan is closed;
and when the indoor temperature difference is smaller than or equal to the inner ring preset value, the electric auxiliary heating device and the inner fan are closed.
6. The defrost control method of claim 5, wherein said turning on the electric auxiliary device and the inner fan when the outdoor ambient temperature is less than or equal to the outer loop preset value comprises:
when the outdoor environment temperature is less than or equal to a first outer ring preset value and greater than a second outer ring preset value, only starting the electric auxiliary heat device;
and when the outdoor environment temperature is less than or equal to the second outer ring preset value, the electric auxiliary heat device and the inner fan are started.
7. A defrost control apparatus, comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a stable value of the current of the outer fan and acquiring the current value of the outer fan according to a preset period;
the acquiring unit is also used for acquiring the difference value between the outdoor environment temperature and the indoor temperature;
the acquiring unit is also used for acquiring current values of the external fan twice before and after a preset period after the air conditioner starts a heating mode;
the obtaining unit is further used for obtaining a first difference value between the outer fan current stable value and an outer fan current value before a preset period;
the obtaining unit is further configured to obtain a second difference value between the external fan current stable value and an external fan current value after a preset period;
the obtaining unit is also used for obtaining the running time of the compressor;
the control unit is used for judging whether the air conditioner enters a defrosting stage according to the difference value between the current stabilization value of the outer fan and the current values of the outer fan which are adjacent twice and the running time of the compressor, and specifically comprises the following steps:
comparing the magnitude of the first difference value with a preset difference value;
when the first difference value is larger than the preset difference value, acquiring the ratio of the first difference value to the second difference value and the size of 1;
when the ratio of the first difference value to the second difference value is less than 1, comparing the running time of the compressor with a preset running time;
when the running time of the compressor is greater than the preset running time, controlling the air conditioner to enter a defrosting stage;
the control unit is also used for controlling the air conditioner to operate in a refrigeration mode after entering a defrosting stage;
the control unit is also used for judging whether to start the electric auxiliary heater and the inner fan according to the outdoor environment temperature and the indoor temperature difference value.
8. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the defrost control method according to any one of claims 1-6.
9. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the defrost control method according to any of claims 1-6.
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