CN114811892A - Variable frequency air conditioner and control method and control device thereof - Google Patents
Variable frequency air conditioner and control method and control device thereof Download PDFInfo
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- CN114811892A CN114811892A CN202210332684.XA CN202210332684A CN114811892A CN 114811892 A CN114811892 A CN 114811892A CN 202210332684 A CN202210332684 A CN 202210332684A CN 114811892 A CN114811892 A CN 114811892A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000001816 cooling Methods 0.000 claims description 41
- 239000003507 refrigerant Substances 0.000 claims description 41
- 230000008859 change Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 35
- 238000010438 heat treatment Methods 0.000 description 19
- 230000000694 effects Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000011217 control strategy Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F24F11/62—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
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2130/00—Control inputs relating to environmental factors not covered by group F24F2110/00
- F24F2130/10—Weather information or forecasts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a variable frequency air conditioner and a control method and a control device thereof, which are used for improving the stability and the reliability of the operation of an air conditioner system and realizing the function of an intelligent air conditioner. The control method comprises the following steps: when the variable frequency air conditioner runs, acquiring the current outdoor environment temperature; judging whether the current outdoor environment temperature meets a preset outer ring temperature condition or not; when the current outdoor environment temperature meets the preset outer loop temperature condition, acquiring the current power module temperature and the current indoor temperature difference, and controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature and the current indoor temperature difference; and when the current outdoor environment temperature does not meet the preset outer ring temperature condition, controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature.
Description
Technical Field
The invention belongs to the technical field of air conditioning, particularly relates to an air conditioner, and more particularly relates to a variable frequency air conditioner and a control method and a control device thereof.
Background
The inverter air conditioner is widely applied because of the advantages of high temperature adjusting speed, high temperature control precision, low operation noise, low energy consumption and the like. A core component of the variable frequency air conditioner is a power module, and when the variable frequency air conditioner works, the power module has large heat productivity and quick temperature rise. If the heat cannot be dissipated in time, the inverter air conditioner fails or stops due to overhigh temperature of the power module, so that the normal and stable operation of the air conditioner is influenced.
In order to improve the cooling effect of the power module, the conventional variable frequency air conditioner adopts a refrigerant to cool the power module. Although the cooling effect of the power module can be improved by using the refrigerant, a part of the refrigerant used for cooling the power module affects the amount of the refrigerant providing heating/cooling capability for the air conditioner system, and further affects the cooling and heating capability of the air conditioner.
In view of this, it is urgently needed to provide a technical scheme capable of balancing the cooling and heating capacities of the air conditioner and the cooling capacity of the power module, and improving the stability and reliability of the operation of the air conditioner system.
Disclosure of Invention
One of the objectives of the present invention is to provide a control method and a control device for a variable frequency air conditioner, which achieve the balance between the cooling and heating capabilities of the air conditioner and the cooling capability of the power module by controlling the opening of two electronic expansion valves, improve the stability and reliability of the operation of the air conditioner system, and achieve the function of an intelligent air conditioner.
In order to achieve the purpose of the invention, the control method of the variable frequency air conditioner provided by the invention adopts the following technical scheme:
a control method of an inverter air conditioner comprises a power module, a first electronic expansion valve and a second electronic expansion valve which are connected in parallel, wherein the first electronic expansion valve is arranged in a refrigerant main loop of the inverter air conditioner, and the second electronic expansion valve is arranged in a refrigerant branch for cooling the power module;
the control method comprises the following steps:
when the variable frequency air conditioner runs, acquiring the current outdoor environment temperature;
judging whether the current outdoor environment temperature meets a preset outer ring temperature condition or not;
when the current outdoor environment temperature meets the preset outer loop temperature condition, acquiring the current power module temperature and the current indoor temperature difference, and controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature and the current indoor temperature difference; the current indoor temperature difference is determined according to the current indoor temperature and the current set temperature;
and when the current outdoor environment temperature does not meet the preset outer ring temperature condition, controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature.
In some embodiments of the present application, controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature and the current indoor temperature difference includes:
when the current indoor temperature difference meets a preset indoor temperature difference condition, the following control is executed on the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature:
when the temperature of the current power module is smaller than a first temperature threshold value, increasing the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be an initial opening degree;
when the current power module temperature is not less than the first temperature threshold value and less than a second temperature threshold value, increasing the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a first opening degree;
and when the current power module temperature is not less than the second temperature threshold value and less than a third temperature threshold value, and the change rate of the current power module temperature is greater than 0, maintaining the opening degree of the first electronic expansion valve, and increasing the opening degree of the second electronic expansion valve.
In some embodiments of the present application, the control method further comprises:
and when the current temperature of the power module is not less than the third temperature threshold value and the opening degree of the second electronic expansion valve reaches a second opening degree, controlling the variable-frequency air conditioner to stop.
In some embodiments of the present application, controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature and the current indoor temperature difference further includes:
when the current indoor temperature difference does not meet a preset indoor temperature difference condition, the following control is executed on the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature:
when the temperature of the current power module is smaller than a first temperature threshold value, maintaining the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a first opening degree;
when the temperature of the current power module is not less than the first temperature threshold value and less than a second temperature threshold value, maintaining the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a third opening degree; the third opening degree is larger than the first opening degree;
when the current power module temperature is not less than the second temperature threshold value and less than a fourth temperature threshold value, and the change rate of the current power module temperature is greater than 0, maintaining the opening degree of the first electronic expansion valve, and increasing the opening degree of the second electronic expansion valve; the fourth temperature threshold is less than the third temperature threshold;
and when the current power module temperature is not less than the fourth temperature threshold value, is less than the third temperature threshold value, and the opening degree of the second electronic expansion valve is not less than the third opening degree, reducing the opening degree of the first electronic expansion valve.
In some embodiments of the present application, the control method further comprises:
and when the current temperature of the power module is not less than the third temperature threshold value and the opening degree of the second electronic expansion valve reaches the second opening degree, controlling the variable-frequency air conditioner to stop.
In some embodiments of the present application, when the current outdoor environment temperature does not satisfy the preset outer loop temperature condition, controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature includes:
when the temperature of the current power module is smaller than the first temperature threshold value, keeping the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a fourth opening degree;
when the current power module temperature is not less than the first temperature threshold value and less than a second temperature threshold value, and the change rate of the current power module temperature is greater than 0, maintaining the opening degree of the first electronic expansion valve, and increasing the opening degree of the second electronic expansion valve;
when the current power module temperature is not less than the second temperature threshold value and less than a fifth temperature threshold value, reducing the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve; the fifth temperature threshold is less than the third temperature threshold.
In some embodiments of the present application, the control method further comprises:
and when the current power module temperature is not less than the fifth temperature threshold value, controlling the variable frequency air conditioner to stop.
In order to achieve the above purpose, the control device of the inverter air conditioner provided by the invention adopts the following technical scheme:
a control device of a variable frequency air conditioner comprises a power module, a first electronic expansion valve and a second electronic expansion valve which are connected in parallel, wherein the first electronic expansion valve is arranged in a main refrigerant loop of the variable frequency air conditioner, and the second electronic expansion valve is arranged in a refrigerant branch for cooling the power module;
the control device includes:
the current outdoor environment temperature acquisition unit is used for acquiring the current outdoor environment temperature when the variable frequency air conditioner operates;
the current outdoor environment temperature judging unit is used for judging whether the current outdoor environment temperature meets a preset outer ring temperature condition or not;
a current power module temperature obtaining unit, configured to obtain a current power module temperature at least when the current outdoor environment temperature meets the preset outer loop temperature condition;
a current indoor temperature difference obtaining unit, configured to obtain a current indoor temperature difference at least when the current outdoor environment temperature meets the preset outer loop temperature condition; the current indoor temperature difference is determined according to the current indoor temperature and the current set temperature;
and the expansion valve opening control unit is used for controlling the current outdoor environment temperature to meet the preset outer ring temperature condition according to the current power module temperature and the current indoor temperature difference to control the opening of the first electronic expansion valve and the second electronic expansion valve, and is also used for controlling the opening of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature when the outer ring temperature condition is preset.
Still another objective of the present invention is to provide an inverter air conditioner, which includes a power module, and further includes a first electronic expansion valve and a second electronic expansion valve connected in parallel, wherein the first electronic expansion valve is disposed in a refrigerant main loop of the inverter air conditioner, and the second electronic expansion valve is disposed in a refrigerant branch for cooling the power module; the inverter air conditioner also comprises the inverter air conditioner control device.
Still another objective of the present invention is to provide an electronic device, which includes a processor, a memory, and a computer program stored in the memory, wherein the processor is configured to execute the computer program, so as to implement the control method of the inverter air conditioner.
Compared with the prior art, the invention has the advantages and positive effects that:
the variable frequency air conditioner is provided with a first electronic expansion valve in a main refrigerant loop, a second electronic expansion valve in a refrigerant branch for cooling a power module, outdoor environment temperature is used as a judgment parameter for regulating and controlling the opening degree of the two electronic expansion valves, and when the outdoor environment temperature meets a preset outer loop temperature condition, the opening degree of the two valves is further controlled by combining the temperature of the power module and the indoor temperature difference at the same time, so that the balance of the refrigerating and heating capacity of the air conditioner and the cooling capacity of the power module is realized; when the outdoor environment temperature does not meet the preset outer ring temperature condition, the opening degrees of the two valves are controlled only according to the temperature of the power module, and the cooling of the power module is realized on the basis of not influencing the requirements of the refrigerating and heating capacity; therefore, the stability and the reliability of the operation of the air conditioner system are improved, and the function of the intelligent variable frequency air conditioner is realized.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an inverter air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of a method for controlling an inverter air conditioner according to the present invention;
FIG. 3 is a schematic flow chart diagram illustrating another embodiment of a method for controlling an inverter air conditioner according to the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a control device of the inverter air conditioner of the present invention;
fig. 5 is a schematic structural diagram of an embodiment of the electronic device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
It should be noted that the technical solutions in the embodiments of the present invention may be combined with each other, but must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the protection scope of the present invention.
Aiming at the problem that the prior inverter air conditioner lacks a technical scheme for reasonably distributing and controlling the refrigerant in the technology of cooling the power module by the refrigerant, the invention creatively provides that a first electronic expansion valve is arranged in a main loop of the refrigerant of the inverter air conditioner, a second electronic expansion valve is arranged in a branch of the refrigerant for cooling the power module, the outdoor environment temperature is used as a judgment parameter for regulating and controlling the opening degrees of the two electronic expansion valves, the opening degrees of the two electronic expansion valves are controlled by adopting the temperature of the power module or the combination of the temperature of the power module and the indoor temperature difference according to the different outdoor environment temperatures, the balance of the refrigerating and heating capacity of the air conditioner and the cooling capacity of the power module is realized, the stability and the reliability of the operation of the air conditioner system are improved, and the function of the intelligent inverter air conditioner is realized.
Fig. 1 is a schematic structural diagram of an inverter air conditioner according to an embodiment of the present invention.
As illustrated in fig. 1, the inverter air conditioner of the embodiment includes a compressor 11, a condenser 12, a first electronic expansion valve 14, and an evaporator 13 connected in this order, and constitutes a main refrigerant circuit of the inverter air conditioner, and performs a cooling and heating cycle of the air conditioner. The inverter air conditioner also comprises a power module (not shown in the figure) and a second electronic expansion valve 15, wherein the second electronic expansion valve 15 is connected with the first electronic expansion valve 14 in parallel and is arranged in a refrigerant branch for cooling the power module. The inverter air conditioner also comprises a control device 16 which is used for realizing the control of the opening degree of the first electronic expansion valve 14 and the second electronic expansion valve 15. The specific control method and the control process refer to the description of the subsequent embodiments.
Wherein the cooling and heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat the indoor space.
The refrigeration working principle of the variable frequency air conditioner is as follows: the compressor 11 works to make the inside of the evaporator 13 (heat exchanger of the indoor unit at this time) in an ultra-low pressure state, the liquid refrigerant in the evaporator 13 evaporates and absorbs heat rapidly, and the air blown out by the indoor fan is cooled by the coil of the evaporator 13 and then turns into cold air to be blown into the room. The evaporated and gasified refrigerant is pressurized by the compressor 11, and then condensed into a liquid state in a high-pressure environment in the condenser 12 (in this case, a heat exchanger of the outdoor unit), and releases heat, and the heat is dissipated to the atmosphere by the outdoor fan, so that the refrigeration effect is achieved by the circulation.
The heating working principle of the inverter air conditioner is as follows: the gas refrigerant is pressurized by the compressor 11 to become high-temperature and high-pressure gas, and enters the condenser 12 (in this case, a heat exchanger of the indoor unit), where the gas refrigerant is condensed, liquefied, and releases heat to become liquid, and at the same time, heats indoor air, thereby achieving the purpose of raising the indoor temperature. The liquid refrigerant is decompressed by the first electronic expansion valve, enters the evaporator 13 (in this case, the heat exchanger of the outdoor unit), evaporates, absorbs heat, turns into gas, absorbs heat from outdoor air (the outdoor air becomes cooler), turns into a gaseous refrigerant, and enters the compressor 11 again to start the next cycle.
Fig. 2 is a schematic flow chart illustrating a control method of an inverter air conditioner according to an embodiment of the present invention. The structure of the inverter air conditioner in this embodiment, as shown in fig. 1, includes a power module, and further includes a first electronic expansion valve and a second electronic expansion valve connected in parallel, where the first electronic expansion valve is disposed in a refrigerant main loop of the inverter air conditioner, and the second electronic expansion valve is disposed in a refrigerant branch for cooling the power module.
As illustrated in fig. 2, this embodiment implements control of the air conditioner using the following procedure.
Step 21: and when the variable frequency air conditioner operates, acquiring the current outdoor environment temperature.
The current outdoor environment temperature is the real-time temperature of the outdoor environment where the outdoor unit of the variable frequency air conditioner is located, which is continuously acquired according to the set sampling frequency, and can be acquired by a temperature detection device arranged by the outdoor unit or acquired from a meteorological server and the like through the internet.
Step 22: and judging whether the current outdoor environment temperature meets the preset outer ring temperature condition or not. If yes, go to step 23; otherwise, step 24 is performed.
The preset outer ring temperature condition is used as a judgment condition for executing different control strategies on the opening degree of the expansion valve, and is a known condition, which can be a fixed condition or a dynamically variable condition. The preset principle of the external ring temperature condition is as follows: when the outdoor environment temperature does not meet the preset external loop temperature condition, the temperature of the power module is reduced by sacrificing the refrigerating/heating capacity of the air conditioner, and the stable operation of the air conditioner is realized.
In some embodiments, the preset outer loop temperature condition is: the outer ring temperature is not less than the outer ring temperature threshold. In some embodiments, the outer ring temperature threshold is 35 ℃. And when the current outdoor environment temperature is not less than the outer ring temperature threshold value, judging that the current outdoor environment temperature meets the preset outer ring temperature condition.
Step 23: and acquiring the current power module temperature and the current indoor temperature difference, and controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature and the current indoor temperature difference.
The current temperature of the power module is the temperature of the power module of the variable frequency air conditioner continuously acquired according to the set sampling frequency, and can be acquired through a temperature detection device arranged on the surface of the power module. The current indoor temperature difference is the difference between the current indoor temperature of the indoor environment where the variable frequency air conditioner indoor unit is located and the current set temperature of the variable frequency air conditioner, which is continuously obtained according to the set sampling frequency.
And when the outdoor environment temperature meets the preset outer loop temperature condition, the current power module temperature and the current indoor temperature difference are comprehensively considered, and the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve are controlled according to the two temperatures as control parameters.
Step 24: and acquiring the current temperature of the power module, and controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current temperature of the power module.
When the outdoor environment temperature does not meet the preset outer loop temperature condition, only the current power module temperature is needed to be obtained, and the opening degrees of the two electronic expansion valves are controlled according to the current power module temperature without considering the influence of the indoor temperature difference.
By adopting the control method of the embodiment, the outdoor environment temperature is used as a judgment parameter for regulating the opening degree of the two electronic expansion valves, and when the outdoor environment temperature meets the preset external environment temperature condition, the opening degrees of the two valves are further controlled by simultaneously combining the temperature of the power module and the indoor temperature difference, so that the balance between the refrigerating and heating capacity of the air conditioner and the cooling capacity of the power module is realized; when the outdoor environment temperature does not meet the preset outer ring temperature condition, the opening degrees of the two valves are controlled only according to the temperature of the power module, and the cooling of the power module is realized on the basis of not influencing the requirements of the refrigerating and heating capacity; therefore, stability and reliability of operation of the air conditioner system are provided, and the function of the intelligent variable frequency air conditioner is realized.
Fig. 3 is a schematic flow chart illustrating a control method of an inverter air conditioner according to another embodiment of the present invention. The structure of the inverter air conditioner in this embodiment, as shown in fig. 1, includes a power module, and further includes a first electronic expansion valve and a second electronic expansion valve connected in parallel, where the first electronic expansion valve is disposed in a refrigerant main loop of the inverter air conditioner, and the second electronic expansion valve is disposed in a refrigerant branch for cooling the power module.
As illustrated in fig. 3, this embodiment implements control of the air conditioner using the following procedure.
Step 31: and when the variable frequency air conditioner operates, acquiring the current outdoor environment temperature.
Step 32: and judging whether the current outdoor environment temperature meets the preset outer ring temperature condition or not. If yes, go to step 33; otherwise, go to step 37.
Step 33: and when the current outdoor environment temperature is judged to meet the preset outer loop temperature condition, acquiring the current power module temperature and the current indoor temperature difference.
The specific implementation process, parameter meaning, parameter obtaining mode, determination of preset outer ring temperature condition, and the like of the above three steps refer to the corresponding description of the embodiment in fig. 2.
Step 34: and judging whether the current indoor temperature difference meets the preset indoor temperature difference condition. If yes, go to step 35; otherwise, step 36 is executed.
The preset indoor temperature difference condition is used as a judgment condition for executing different control strategies on the opening degree of the expansion valve when the current outdoor environment temperature meets the preset outer loop temperature condition, and is a known condition, which can be a fixed condition or a dynamically variable condition. The setting principle of presetting the indoor temperature difference condition is as follows: when the indoor temperature difference satisfies the preset indoor temperature difference condition, the cooling/heating capacity of the air conditioner is preferentially considered.
In some embodiments, the preset indoor temperature difference condition is: the indoor temperature difference is larger than a set temperature difference threshold value. In some embodiments, the temperature difference threshold is set at 4 ℃. And when the current indoor temperature difference is larger than the set temperature difference threshold value, judging that the current indoor temperature difference meets the preset indoor temperature difference condition. And then, different controls are executed according to whether the current indoor temperature difference meets the preset indoor temperature difference condition.
Step 35: and controlling the opening degrees of the two electronic expansion valves according to the relation between the current power module and the first temperature threshold, the second temperature threshold and the third temperature threshold.
And when the current indoor temperature difference meets the preset indoor temperature difference condition, controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the relationship between the current power module temperature and the three temperature thresholds.
The specific control process comprises the following steps:
(1) and when the temperature of the current power module is smaller than the first temperature threshold value, increasing the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be the initial opening degree. The opening degree of the first electronic expansion valve is increased, the refrigerant flow in the refrigerant main loop is increased, the refrigerating/heating capacity of the air conditioner is improved, and the requirement for indoor temperature adjustment is met quickly. Meanwhile, the second electronic expansion valve keeps the initial opening degree, and the stable operation of the air conditioner system is kept.
The first temperature threshold is a known value, and may be a fixed constant value or a dynamically variable value. In some embodiments, the first temperature threshold is 85 ℃.
The opening degree of the first electronic expansion valve may be increased based on the opening degree of the first electronic expansion valve determined by other control strategies of the air conditioner. In some embodiments, the opening degree of the first electronic expansion valve may be increased by 10 pls.
The initial opening degree of the second electronic expansion valve is a known opening degree value. In some embodiments, the initial opening is 120 pls.
(2) And when the temperature of the current power module is not less than the first temperature threshold value and less than the second temperature threshold value, increasing the opening degree of the first electronic expansion valve and controlling the opening degree of the second electronic expansion valve to be the first opening degree.
The first opening degree is a known opening degree value and is greater than the initial opening degree. In some embodiments, the first opening is 150 pls. The opening degree of the first electronic expansion valve is increased, the refrigerant flow in the refrigerant main loop is increased, the refrigerating/heating capacity of the air conditioner is improved, and the requirement for indoor temperature adjustment is met quickly. Meanwhile, the second electronic expansion valve keeps the first opening degree, the cooling capacity of the power module is increased, and the stable operation of the air conditioner system is realized.
The second temperature threshold is a known value, which is greater than the first temperature threshold, and may be a fixed or dynamically variable value. In some embodiments, the second temperature threshold is 90 ℃.
The opening degree of the first electronic expansion valve may be increased based on the opening degree of the first electronic expansion valve determined by other control strategies of the air conditioner. In some embodiments, the opening degree of the first electronic expansion valve may be increased by 10 pls.
(3) And when the current temperature of the power module is not less than the second temperature threshold value and less than the third temperature threshold value and the change rate of the current temperature of the power module is greater than 0, maintaining the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve. The opening degree of the second electronic expansion valve is increased, so that the cooling capacity of the power module is increased; meanwhile, the opening degree of the first electronic expansion valve is maintained to maintain the stable operation of the system.
In some embodiments, the opening degree of the second electronic expansion valve is increased without exceeding the second opening degree. Wherein the second opening is a known opening having a value greater than the first opening. In some embodiments, the second opening is 350 pls.
The third temperature threshold is a known value, which is greater than the second temperature threshold, and may be a fixed or dynamically variable value. In some embodiments, the third temperature threshold is 105 ℃.
The change rate of the current power module temperature is larger than 0, which indicates that the current power module temperature shows a rising change trend.
Maintaining the opening degree of the first electronic expansion valve means that the opening degree of the first electronic expansion valve is not adjusted according to the temperature of the power module any more, but the opening degree of the first electronic expansion valve is not necessarily a fixed opening degree, and the first electronic expansion valve can still work according to the opening degree determined by other control strategies.
In some other embodiments, when the current indoor temperature difference satisfies the preset indoor temperature difference condition, the control method further includes:
and when the current temperature of the power module is not less than the third temperature threshold value and the opening degree of the second electronic expansion valve reaches the second opening degree, controlling the variable frequency air conditioner to stop, and avoiding the adverse effect caused by overhigh temperature of the power module. In other embodiments, an alarm or alert is also issued that the power module is at an excessive temperature.
Step 36: and controlling the opening degrees of the two electronic expansion valves according to the relationship between the current power module and the first temperature threshold, the second temperature threshold, the third temperature threshold and the fourth temperature threshold.
And when the current indoor temperature difference does not meet the preset indoor temperature difference condition, controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the relationship between the current power module temperature and the four temperature thresholds. Compared with the control process in the step 35, when the indoor temperature difference does not meet the preset indoor temperature difference threshold, the cooling/heating load requirement is low, the fourth temperature threshold is added, the valve opening is slowly adjusted by setting more temperature thresholds, and the stability of system operation is further improved.
The specific control process comprises the following steps:
(1) when the temperature of the current power module is smaller than the first temperature threshold value, the opening degree of the first electronic expansion valve is kept, and the opening degree of the second electronic expansion valve is controlled to be the first opening degree.
Because the demand of the refrigeration/heating load is smaller, the opening degree of the first electronic expansion valve is kept, meanwhile, the second electronic expansion valve is controlled to be in the middle opening degree, certain cooling capacity of the power module is kept, the overhigh temperature of the power module is avoided, and meanwhile, the stable operation of the air conditioner system is kept.
(2) When the temperature of the current power module is not less than the first temperature threshold value and less than the second temperature threshold value, the opening degree of the first electronic expansion valve is kept, and the opening degree of the second electronic expansion valve is controlled to be a third opening degree. The third opening degree is a known value and is larger than the first opening degree. In some embodiments, the third opening is 200 pls. And when the temperature of the power module is higher than the first temperature threshold value, controlling the second electronic expansion valve to operate at a larger third opening degree, and improving the cooling capacity of the power module.
(3) And when the current power module temperature is not less than the second temperature threshold value and less than the fourth temperature threshold value and the change rate of the current power module temperature is greater than 0, maintaining the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve.
The fourth temperature threshold is a known value and has a value greater than the second temperature threshold but less than the third temperature threshold. In some embodiments, the fourth temperature threshold is 100 ℃. When the temperature of the power module is further increased, the opening degree of the second electronic expansion valve is further increased, and the cooling capacity of the power module is improved.
(4) And when the current temperature of the power module is not less than a fourth temperature threshold value and less than a third temperature threshold value and the opening degree of the second electronic expansion valve is not less than a third opening degree, reducing the opening degree of the first electronic expansion valve. The opening degree of the first electronic expansion valve is reduced, the refrigerating/heating capacity of the air conditioner is sacrificed, more refrigerants are used for cooling the power module, and the air conditioner can stably run for a long time without stopping.
In some other embodiments, when the current indoor temperature difference does not satisfy the preset indoor temperature difference condition, the control method further includes:
when the current temperature of the power module is not less than the third temperature threshold value and the opening degree of the second electronic expansion valve reaches the second opening degree, the variable frequency air conditioner is controlled to stop, and adverse effects caused by overhigh temperature of the power module are avoided. In other embodiments, an alarm or alert is also issued that the power module is at an excessive temperature.
Step 37: when it is determined in step 32 that the current outdoor environment temperature does not satisfy the preset outer loop temperature condition, the current power module temperature is acquired.
When the outdoor environment temperature does not meet the preset outer loop temperature condition, only the current power module temperature is needed to be obtained, and the opening degrees of the two electronic expansion valves are controlled according to the current power module temperature without considering the influence of the indoor temperature difference.
Step 38: and controlling the opening degrees of the two electronic expansion valves according to the relation between the current power module and the first temperature threshold, the second temperature threshold and the fifth temperature threshold.
When the current outdoor environment temperature does not meet the preset outer loop temperature condition, the temperature reduction of the power module is taken as a main regulation purpose, and the opening degrees of the first electronic expansion valve and the second electronic expansion valve are controlled according to the relation between the current power module temperature and three temperature thresholds.
The specific control process comprises the following steps:
(1) and when the temperature of the current power module is smaller than the first temperature threshold value, keeping the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a fourth opening degree.
The fourth opening degree is a known value, and the value thereof is between the first opening degree and the third opening degree. In some embodiments, the fourth opening is 170 pls. By controlling the opening degree of the second electronic expansion valve to be the fourth opening degree and keeping the opening degree of the first electronic expansion valve, certain cooling capacity of the power module can be kept, overhigh temperature of the power module is avoided, and meanwhile, stable operation of the air conditioner system is kept.
(2) And when the current temperature of the power module is not less than the first temperature threshold value and less than the second temperature threshold value and the change rate of the current temperature of the power module is greater than 0, maintaining the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve.
When the temperature of the power module is further increased, the opening degree of the second electronic expansion valve is further increased, and the cooling capacity of the power module is improved.
(3) When the temperature of the current power module is not less than the second temperature threshold and less than the fifth temperature threshold, the opening degree of the first electronic expansion valve is reduced, and the opening degree of the second electronic expansion valve is increased, so that the cooling capacity of the power module is improved, and the cooling effect of the power module is enhanced.
The fifth temperature threshold is a known value and is less than the third temperature threshold. In some embodiments, the fifth temperature threshold is 95 ℃. When the current outdoor environment temperature does not meet the preset outer ring temperature condition, the fifth temperature threshold smaller than the third temperature threshold is set as the judgment temperature for stopping the machine, so that the effective protection strength of the power module can be improved.
In some other embodiments, when the current outdoor environment temperature does not satisfy the preset outer loop temperature condition, the control method further includes:
and when the current temperature of the power module is not less than the fifth temperature threshold value, controlling the variable frequency air conditioner to stop. The adverse effect caused by overhigh temperature of the power module is avoided. In other embodiments, an alarm or alert is also issued that the power module is at an excessive temperature.
Fig. 4 is a schematic structural diagram illustrating an embodiment of a control device of an inverter air conditioner according to the present invention. The structure of the inverter air conditioner in this embodiment, as shown in fig. 1, includes a power module, and further includes a first electronic expansion valve and a second electronic expansion valve connected in parallel, where the first electronic expansion valve is disposed in a refrigerant main loop of the inverter air conditioner, and the second electronic expansion valve is disposed in a refrigerant branch for cooling the power module.
The control device of this embodiment includes the structural units, the functions of the structural units, and the relationship between them, as follows:
the control device includes:
and a current outdoor environment temperature obtaining unit 41, configured to obtain the current outdoor environment temperature when the inverter air conditioner is in operation.
A current outdoor environment temperature judging unit 42, configured to judge whether the current outdoor environment temperature acquired by the current outdoor environment temperature acquiring unit 41 meets a preset external environment temperature condition.
A current power module temperature obtaining unit 43, configured to obtain the current power module temperature at least when the current outdoor environment temperature judging unit 42 judges that the current outdoor environment temperature meets the preset outer loop temperature condition.
And a current indoor temperature difference obtaining unit 44, configured to obtain the current indoor temperature difference at least when the current outdoor environment temperature judging unit 42 judges that the current outdoor environment temperature meets the preset outer-loop temperature condition. The current indoor temperature difference is determined according to the current indoor temperature and the current set temperature.
An expansion valve opening degree control unit 45, configured to control opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature acquired by the current power module temperature acquisition unit 43 and the current indoor temperature difference acquired by the current indoor temperature difference acquisition unit 44 when the current outdoor environment temperature judgment unit 42 determines that the current outdoor environment temperature meets the preset outer loop temperature condition; and is further configured to control the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature obtained by the current power module temperature obtaining unit 43 when the current outdoor environment temperature judging unit 42 judges that the current outdoor environment temperature does not satisfy the preset outer loop temperature condition.
The control device with the structure runs corresponding software programs to execute corresponding functions, and controls the air conditioner according to the control method embodiment of the variable frequency air conditioner shown in the figures 2 and 3 and the processes of other embodiments, so that the technical effects corresponding to the control method of the variable frequency air conditioner shown in the figures 2 and 3 and other embodiments are achieved.
The air conditioner control device of the embodiment is applied to the variable frequency air conditioner, can improve the stability and the reliability of the operation of an air conditioner system, and realizes the function of an intelligent air conditioner.
Fig. 5 shows a block diagram of an embodiment of the electronic device of the present invention. The electronic device comprises a processor 51, a memory 52 and a computer program 521 stored on the memory 52, wherein the processor 51 is configured to execute the computer program 521, so as to realize the air conditioner control methods of the embodiment in fig. 2, the embodiment in fig. 3 and other embodiments, and realize the technical effects of the corresponding embodiments. The electronic device can be a main control board, a controller and the like of the air conditioner.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. The control method of the inverter air conditioner comprises a power module and is characterized in that the inverter air conditioner also comprises a first electronic expansion valve and a second electronic expansion valve which are connected in parallel, wherein the first electronic expansion valve is arranged in a refrigerant main loop of the inverter air conditioner, and the second electronic expansion valve is arranged in a refrigerant branch for cooling the power module;
the control method comprises the following steps:
when the variable frequency air conditioner runs, acquiring the current outdoor environment temperature;
judging whether the current outdoor environment temperature meets a preset outer ring temperature condition or not;
when the current outdoor environment temperature meets the preset outer loop temperature condition, acquiring the current power module temperature and the current indoor temperature difference, and controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature and the current indoor temperature difference; the current indoor temperature difference is determined according to the current indoor temperature and the current set temperature;
and when the current outdoor environment temperature does not meet the preset outer ring temperature condition, controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature.
2. The method of claim 1, wherein controlling the opening degrees of the first and second electronic expansion valves according to the current power module temperature and the current indoor temperature difference comprises:
when the current indoor temperature difference meets a preset indoor temperature difference condition, the following control is executed on the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature:
when the temperature of the current power module is smaller than a first temperature threshold value, increasing the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be an initial opening degree;
when the temperature of the current power module is not less than the first temperature threshold value and less than a second temperature threshold value, increasing the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a first opening degree;
and when the current power module temperature is not less than the second temperature threshold value and less than a third temperature threshold value, and the change rate of the current power module temperature is greater than 0, maintaining the opening degree of the first electronic expansion valve, and increasing the opening degree of the second electronic expansion valve.
3. The control method of an inverter air conditioner according to claim 2, further comprising:
and when the current temperature of the power module is not less than the third temperature threshold value and the opening degree of the second electronic expansion valve reaches a second opening degree, controlling the variable-frequency air conditioner to stop.
4. The method of claim 2, wherein the opening degrees of the first electronic expansion valve and the second electronic expansion valve are controlled according to the current power module temperature and the current indoor temperature difference, further comprising:
when the current indoor temperature difference does not meet a preset indoor temperature difference condition, the following control is executed on the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature:
when the temperature of the current power module is smaller than a first temperature threshold value, maintaining the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a first opening degree;
when the temperature of the current power module is not less than the first temperature threshold value and less than a second temperature threshold value, maintaining the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a third opening degree; the third opening degree is larger than the first opening degree;
when the current power module temperature is not less than the second temperature threshold value and less than a fourth temperature threshold value, and the change rate of the current power module temperature is greater than 0, maintaining the opening degree of the first electronic expansion valve, and increasing the opening degree of the second electronic expansion valve; the fourth temperature threshold is less than the third temperature threshold;
and when the current power module temperature is not less than the fourth temperature threshold value, is less than the third temperature threshold value, and the opening degree of the second electronic expansion valve is not less than the third opening degree, reducing the opening degree of the first electronic expansion valve.
5. The control method of an inverter air conditioner according to claim 4, further comprising:
and when the current temperature of the power module is not less than the third temperature threshold value and the opening degree of the second electronic expansion valve reaches the second opening degree, controlling the variable-frequency air conditioner to stop.
6. The method for controlling an inverter air conditioner according to any one of claims 2 to 5, wherein controlling the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature when the current outdoor environment temperature does not satisfy the preset outer loop temperature condition, comprises:
when the temperature of the current power module is smaller than the first temperature threshold value, keeping the opening degree of the first electronic expansion valve, and controlling the opening degree of the second electronic expansion valve to be a fourth opening degree;
when the current power module temperature is not less than the first temperature threshold value and less than a second temperature threshold value, and the change rate of the current power module temperature is greater than 0, maintaining the opening degree of the first electronic expansion valve, and increasing the opening degree of the second electronic expansion valve;
when the current power module temperature is not less than the second temperature threshold value and less than a fifth temperature threshold value, reducing the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve; the fifth temperature threshold is less than the third temperature threshold.
7. The control method of an inverter air conditioner according to claim 6, further comprising:
and when the current power module temperature is not less than the fifth temperature threshold value, controlling the variable frequency air conditioner to stop.
8. The control device of the variable frequency air conditioner comprises a power module and is characterized by further comprising a first electronic expansion valve and a second electronic expansion valve which are connected in parallel, wherein the first electronic expansion valve is arranged in a refrigerant main loop of the variable frequency air conditioner, and the second electronic expansion valve is arranged in a refrigerant branch for cooling the power module;
the control device includes:
the current outdoor environment temperature acquisition unit is used for acquiring the current outdoor environment temperature when the variable frequency air conditioner operates;
the current outdoor environment temperature judging unit is used for judging whether the current outdoor environment temperature meets a preset outer ring temperature condition or not;
a current power module temperature obtaining unit, configured to obtain a current power module temperature at least when the current outdoor environment temperature meets the preset outer loop temperature condition;
a current indoor temperature difference obtaining unit, configured to obtain a current indoor temperature difference at least when the current outdoor environment temperature meets the preset outer loop temperature condition; the current indoor temperature difference is determined according to the current indoor temperature and the current set temperature;
and the expansion valve opening control unit is used for controlling the current outdoor environment temperature to meet the preset outer ring temperature condition according to the current power module temperature and the current indoor temperature difference to control the opening of the first electronic expansion valve and the second electronic expansion valve, and is also used for controlling the opening of the first electronic expansion valve and the second electronic expansion valve according to the current power module temperature when the outer ring temperature condition is preset.
9. The variable-frequency air conditioner comprises a power module and is characterized by further comprising a first electronic expansion valve and a second electronic expansion valve which are connected in parallel, wherein the first electronic expansion valve is arranged in a main refrigerant loop of the variable-frequency air conditioner, and the second electronic expansion valve is arranged in a refrigerant branch for cooling the power module; the inverter air conditioner further comprises the inverter air conditioner control device of claim 8.
10. An electronic device comprising a processor, a memory and a computer program stored on the memory, wherein the processor is configured to execute the computer program to implement the method for controlling an inverter air conditioner according to any one of claims 1 to 7.
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| CN202210332684.XA CN114811892A (en) | 2022-03-31 | 2022-03-31 | Variable frequency air conditioner and control method and control device thereof |
| PCT/CN2023/079382 WO2023185369A1 (en) | 2022-03-31 | 2023-03-02 | Variable-frequency air conditioner, and control method and control apparatus therefor |
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| CN202210332684.XA CN114811892A (en) | 2022-03-31 | 2022-03-31 | Variable frequency air conditioner and control method and control device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023185369A1 (en) * | 2022-03-31 | 2023-10-05 | 青岛海尔空调器有限总公司 | Variable-frequency air conditioner, and control method and control apparatus therefor |
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| CN106766001B (en) * | 2017-02-04 | 2019-09-03 | 青岛海尔空调器有限总公司 | A kind of control method of air-conditioning, device and air-conditioning |
| CN106679119B (en) * | 2017-02-04 | 2019-11-05 | 青岛海尔空调器有限总公司 | A kind of control method of air-conditioning, device and air-conditioning |
| CN109945389B (en) * | 2019-03-29 | 2020-05-05 | 广东美的制冷设备有限公司 | Control method and device of air conditioner and air conditioner |
| CN110594947B (en) * | 2019-09-29 | 2021-06-08 | 海信（山东）空调有限公司 | Control method and control device of air conditioner and air conditioner |
| CN114811892A (en) * | 2022-03-31 | 2022-07-29 | 青岛海尔空调器有限总公司 | Variable frequency air conditioner and control method and control device thereof |
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- 2022-03-31 CN CN202210332684.XA patent/CN114811892A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023185369A1 (en) * | 2022-03-31 | 2023-10-05 | 青岛海尔空调器有限总公司 | Variable-frequency air conditioner, and control method and control apparatus therefor |
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