CN112781200B - Wall-penetrating type air conditioner, control method and device thereof and readable storage medium - Google Patents

Wall-penetrating type air conditioner, control method and device thereof and readable storage medium Download PDF

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Publication number
CN112781200B
CN112781200B CN201911060657.6A CN201911060657A CN112781200B CN 112781200 B CN112781200 B CN 112781200B CN 201911060657 A CN201911060657 A CN 201911060657A CN 112781200 B CN112781200 B CN 112781200B
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Prior art keywords
air
temperature
electronic expansion
expansion valve
indoor
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CN112781200A (en
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胡伟宏
李锶
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a control method of an air conditioner, which is based on the air conditioner comprising a fresh air heat exchanger and an indoor heat exchanger which are connected in parallel, wherein the fresh air heat exchanger is arranged in a fresh air duct, the indoor heat exchanger is arranged in an indoor return air duct, the fresh air heat exchanger is connected with a first electronic expansion valve in series, and the indoor heat exchanger is connected with a second electronic expansion valve in series, wherein the method comprises the following steps: acquiring a first air outlet temperature of the fresh air duct, a second air outlet temperature of the air conditioner and an indoor environment temperature; and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature and the indoor environment temperature. The invention also discloses a control device, the wall-penetrating air conditioner and a readable storage medium. The invention aims to improve the heat exchange energy efficiency of the air conditioner when fresh air is introduced.

Description

Wall-penetrating type air conditioner, control method and device thereof and readable storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and a control device of an air conditioner, a wall-penetrating type air conditioner and a readable storage medium.
Background
With the continuous improvement of living standard, the requirements of people on the quality of life are higher and higher. The indoor air quality is often reduced due to the single indoor circulation mode for maintaining the indoor temperature. Therefore, the fresh air device is installed in most of current air conditioning systems, and indoor air quality is guaranteed while indoor environment temperature is adjusted.
However, after the air conditioning system introduces the fresh air device, when the fresh air function is used, the introduction of the outdoor air may increase the amount of air that needs to be exchanged by the indoor heat exchanger of the air conditioner, thereby reducing the heating energy efficiency of the air conditioner.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide an air conditioner control method, aiming at improving the heat exchange energy efficiency of an air conditioner when fresh air is introduced.
In order to achieve the purpose, the invention provides a control method of an air conditioner, the air conditioner comprises a fresh air heat exchanger, a compressor, an outdoor heat exchanger and an indoor heat exchanger which are sequentially connected to form a refrigerant circulation loop, the fresh air heat exchanger is connected with the indoor heat exchanger in parallel, the fresh air heat exchanger is connected with a first electronic expansion valve in series, the indoor heat exchanger is connected with a second electronic expansion valve in series, a fresh air duct and an indoor return air duct are formed in the air conditioner, the fresh air heat exchanger is arranged in the fresh air duct, and the indoor heat exchanger is arranged in the indoor return air duct; the control method of the air conditioner comprises the following steps:
acquiring a first air outlet temperature of the fresh air duct, a second air outlet temperature of the indoor return air duct and an indoor environment temperature;
and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature and the indoor environment temperature.
Optionally, the adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature, and the indoor environment temperature includes:
determining the magnitude relation between the first air outlet temperature and the indoor environment temperature, and determining the temperature difference value between the second air outlet temperature and the indoor environment temperature;
and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the size relation and the temperature difference value.
Optionally, the step of adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the size relationship and the temperature difference value includes:
and adjusting the opening degree of the first electronic expansion valve according to the size relation, and adjusting the opening degree of the second electronic expansion valve according to the size relation and the temperature difference value.
Optionally, the step of adjusting the opening degree of the first electronic expansion valve according to the magnitude relation includes:
when the size relation is consistent with a preset relation, controlling the first electronic expansion valve to increase the opening degree;
and when the size relation is inconsistent with the preset relation, controlling the first electronic expansion valve to reduce the opening degree.
Optionally, the step of adjusting the opening degree of the second electronic expansion valve according to the magnitude relationship and the temperature difference value includes:
when the size relation is consistent with the preset relation and the temperature difference value is smaller than or equal to a preset threshold value, controlling the second electronic expansion valve to increase the opening degree;
and when the size relation is inconsistent with the preset relation and the temperature difference value is less than or equal to a preset threshold value, controlling the second electronic expansion valve to reduce the opening degree.
Optionally, before the step of adjusting the opening degree of the first electronic expansion valve according to the magnitude relationship, the method further includes:
acquiring a current operation mode of the air conditioner;
and acquiring the preset relation according to the operation mode.
Optionally, the step of obtaining the preset relationship according to the operation mode includes:
when the operation mode is a heating mode, the preset relation is that the indoor environment temperature is higher than the first air outlet temperature;
when the operation mode is a refrigeration mode, the preset relation is that the indoor environment temperature is lower than the first outlet air temperature.
Optionally, after the step of obtaining the first air-out temperature in new wind channel, the second air-out temperature in indoor return wind channel and indoor ambient temperature, still include:
determining the magnitude relation between the first outlet air temperature and the indoor environment temperature;
and adjusting the running frequency of the compressor according to the size relation.
Optionally, the step of adjusting the operating frequency of the compressor according to the magnitude relationship:
when the air conditioner is in a heating mode currently, if the indoor environment temperature is lower than the first outlet air temperature, controlling the compressor to reduce the operation frequency;
and when the air conditioner is in a refrigeration mode at present, if the indoor environment temperature is higher than the first air outlet temperature, controlling the compressor to reduce the running frequency.
Optionally, its characterized in that, acquire first air-out temperature in new wind channel, after the step of the second air-out temperature in indoor return wind channel and indoor ambient temperature, still include:
determining the magnitude relation between the first outlet air temperature and the indoor environment temperature;
and adjusting the air output of the fresh air outlet according to the size relation.
Optionally, before the step of adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature, and the indoor environment temperature, the method further includes:
when the air conditioner is in a heating mode, acquiring the outlet temperature of the outdoor heat exchanger;
when the outlet temperature is greater than a preset temperature threshold value, executing the step of adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature and the indoor environment temperature;
and when the outlet temperature is less than or equal to a preset temperature threshold and the preset time length is maintained, controlling the first electronic expansion valve to reduce the opening degree.
Optionally, when the outlet temperature is less than or equal to a preset temperature threshold and a preset time length is maintained, before the step of controlling the first electronic expansion valve to reduce the opening degree, the method further includes:
determining a preset opening threshold according to the indoor environment temperature and the first outlet air temperature;
judging whether the current opening degree of the first electronic expansion valve is larger than or equal to the preset opening degree threshold value or not;
if the current opening degree is larger than or equal to the preset opening degree threshold value, executing the step of controlling the first electronic expansion reducing opening degree;
and if the current opening is smaller than the preset opening threshold, controlling the air conditioner to run in a refrigerating mode.
In addition, in order to achieve the above object, the present application also proposes a control device including: the air conditioner control system comprises a memory, a processor and an air conditioner control program stored on the memory and capable of running on the processor, wherein the air conditioner control program realizes the steps of the air conditioner control method according to any one of the above items when being executed by the processor.
In addition, in order to achieve the above object, the present application further provides a wall-penetrating air conditioner, which includes the above control device, a fresh air heat exchanger, and a compressor, an outdoor heat exchanger, and an indoor heat exchanger that are sequentially connected to form a refrigerant circulation loop;
the fresh air heat exchanger is connected with the indoor heat exchanger in parallel, the fresh air heat exchanger is connected with a first electronic expansion valve in series, and the indoor heat exchanger is connected with a second electronic expansion valve in series; the first electronic expansion valve, the second electronic expansion valve and the compressor are all connected with the control device;
the air conditioner further comprises a shell, a fresh air duct and an indoor return air duct are formed in the shell, the fresh air heat exchanger is arranged in the fresh air duct, and the indoor heat exchanger is arranged in the indoor return air duct.
Optionally, the fresh air duct has a fresh air inlet and a fresh air outlet, the indoor return air duct has a return air inlet, a fresh air inlet and an air outlet, the fresh air inlet is communicated with the outdoor environment, the fresh air outlet is communicated with the fresh air inlet, and the return air inlet and the air outlet are communicated with the indoor environment.
Optionally, the wall-penetrating air conditioner further comprises a fluid switch, and the fluid switch is connected with the fresh air heat exchanger in series.
In addition, in order to achieve the above object, the present application also proposes a readable storage medium having stored thereon an air conditioner control program which, when executed by a processor, implements the steps of the control method of an air conditioner as set forth in any one of the above.
The invention provides a control method of an air conditioner, which is applied to the air conditioner provided with an indoor heat exchanger and a fresh air heat exchanger which are connected in parallel, wherein the flow of a refrigerant flowing through the indoor heat exchanger in the air conditioner and the flow of the refrigerant flowing through the fresh air heat exchanger can be independently controlled through a first electronic expansion valve and a second electronic expansion valve respectively, fresh air of an outdoor environment is subjected to heat exchange through the fresh air heat exchanger and then is mixed with indoor air, wherein the opening degrees of the first electronic expansion valve and the second electronic expansion valve are cooperatively adjusted according to a first air outlet temperature of a fresh air duct, a second air outlet temperature of an indoor return air duct and the indoor environment temperature, so that the weakening of the heat exchange capacity of the fresh air on the indoor heat exchanger is reduced, and meanwhile, after the indoor heat exchanger is matched with the fresh air heat exchanger to carry out heat exchange on the fresh air and the indoor return air, the air outlet of the air conditioner has higher heat exchange efficiency on the indoor environment, and the heat exchange efficiency of the air conditioner is improved when the fresh air is introduced.
Drawings
FIG. 1 is a schematic diagram of a refrigerant circulation circuit of an embodiment of an air conditioner applying the control method of the present invention;
FIG. 2 is a schematic diagram showing the distribution of the positions of the fresh air duct and the indoor return air duct of an embodiment of an air conditioner to which the control method of the present invention is applied;
fig. 3 is a schematic diagram of a hardware structure involved in the operation of the control device according to the embodiment of the present invention;
FIG. 4 is a flowchart illustrating a control method of an air conditioner according to a first embodiment of the present invention;
FIG. 5 is a flowchart illustrating a control method of an air conditioner according to a second embodiment of the present invention;
FIG. 6 is a flow chart illustrating a fourth embodiment of a method for controlling an air conditioner in accordance with the present invention;
FIG. 7 is a flow chart illustrating a fifth embodiment of a control method of an air conditioner according to the present invention;
FIG. 8 is a flowchart illustrating a sixth embodiment of a method for controlling an air conditioner in accordance with the present invention;
fig. 9 is a flowchart illustrating a seventh embodiment of a method for controlling an air conditioner according to the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name(s)
1 Air conditioner 10a Shell body
11 Fresh air heat exchanger 101 Fresh air duct
12 Compressor 1011 Fresh air inlet
13 Outdoor heat exchanger 1012 Fresh air outlet
14 Indoor heat exchanger 112 Indoor return air duct
15 First electronic expansion valve 1121 Return air inlet
16 Second electronic expansion valve 1122 Fresh air port
17 Four-way valve 1123 Air outlet
18 Fluid switch 2001 Processor with a memory for storing a plurality of data
01 Indoor environment 2002 Memory device
02 Outdoor environment 300 Temperature sensor
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: based on an air conditioner, this air conditioner includes the new trend heat exchanger and connects gradually compressor, outdoor heat exchanger and the indoor heat exchanger that forms refrigerant circulation return circuit, and the new trend heat exchanger is parallelly connected with the indoor heat exchanger, and the new trend heat exchanger is established ties and is had first electronic expansion valve, and the indoor heat exchanger is established ties and is had second electronic expansion valve, is formed with new trend wind channel and indoor return air wind channel in the air conditioner, and the new trend wind channel is located to the new trend heat exchanger, and indoor return air wind channel is located to the indoor heat exchanger. Based on the air conditioner, the control method of the air conditioner comprises the following steps: acquiring a first air outlet temperature of a fresh air duct, a second air outlet temperature of an indoor return air duct and an indoor environment temperature; and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature and the indoor environment temperature.
In the prior art, after the air conditioning system introduces the fresh air device, when the fresh air function is used, the introduction of outdoor air can cause the increase of the air quantity of the indoor heat exchanger of the air conditioner, which needs to be subjected to heat exchange, and the heating energy efficiency of the air conditioner is reduced.
The invention provides the solution, and aims to improve the heat exchange energy efficiency of the air conditioner when fresh air is introduced.
The invention provides an air conditioner. The air conditioner can be a single heating air conditioner, a single refrigerating air conditioner or an air conditioner with mixed refrigerating and heating functions.
In the embodiment of the invention, the air conditioner is a through-wall air conditioner. Referring to fig. 1, the air conditioner includes a fresh air heat exchanger 11, and a compressor 12, an outdoor heat exchanger 13, and an indoor heat exchanger 14, which are sequentially connected to form a refrigerant circulation circuit. The fresh air heat exchanger 11 and the indoor heat exchanger 14 are connected in parallel, the fresh air heat exchanger 11 is connected in series with a first electronic expansion valve 15, and the indoor heat exchanger 14 is connected in series with a second electronic expansion valve 16. The first electronic expansion valve 15 can adjust the flow of the refrigerant passing through the fresh air heat exchanger 11, and the second electronic expansion valve 16 can adjust the flow of the refrigerant passing through the indoor heat exchanger 14.
Specifically, in a refrigerant circulation loop formed in the air conditioner, one end of a compressor 12 is connected to one end of an outdoor heat exchanger 13, one end of the outdoor heat exchanger 13 is connected to one end of a second electronic expansion valve 16, the other end of the second electronic expansion valve 16 is connected to one end of an indoor heat exchanger 14, the other end of the indoor heat exchanger 14 is connected to the other end of the compressor 12, wherein one end of a first electronic expansion valve 15 is connected between the outdoor heat exchanger 13 and the first electronic expansion valve 15, the other end of the first electronic expansion valve 15 is connected to one end of a fresh air heat exchanger 11, and the other end of the fresh air heat exchanger 11 is connected between the indoor heat exchanger 14 and the compressor 12.
In addition, in the air conditioner capable of switching cooling and heating, the air conditioner further comprises a four-way valve 17, one end of the outdoor heat exchanger 13 connected with the compressor 12 and one end of the indoor heat exchanger 14 connected with the compressor 12 are respectively connected with two refrigerant interfaces of the four-way valve 17, the other two refrigerant interfaces of the four-way valve 17 are connected with two ends of the compressor 12, the flow direction of the refrigerant is switched through the four-way valve 17, and the switching of the cooling and heating operation of the air conditioner is realized.
Referring to fig. 2, the air conditioner further includes a housing 10a, a fresh air duct 101 and an indoor return air duct 112 are formed in the housing 10a, the fresh air duct 101 has a fresh air inlet 1011 and a fresh air outlet 1012, the fresh air inlet 1011 is communicated with an outdoor environment 02, the fresh air outlet 1012 is communicated with the indoor return air duct 112, the fresh air heat exchanger 11 is disposed in the fresh air duct 101, and the indoor heat exchanger 14 is disposed in the indoor return air duct 112. The indoor return air duct 112 has a return air inlet 1121, a fresh air inlet 1122 and an air outlet 1123, wherein the return air inlet 1121 and the air outlet 1123 are both communicated with the indoor environment 01 acted by the air conditioner, and the fresh air outlet 1012 is communicated with the indoor return air duct 112 through the fresh air inlet 1122. Structurally, the fresh air inlet 1122 and the fresh air outlet 1012 may specifically refer to the same passage opening. The fresh air duct 101 may be provided therein with a fresh air blower, which can drive air in the outdoor environment 02 to enter the fresh air duct 101 from a fresh air inlet 1011 during operation, and then to be discharged into the indoor return air duct 112 through a fresh air outlet 1012 through a fresh air inlet 1122. An indoor fan can be arranged in the indoor return air duct 112, and when the indoor fan operates, the indoor fan can drive air in the indoor environment 01 to enter the indoor return air duct 112 from the return air inlet 1121, mix with fresh air entering the fresh air duct 101, and blow the air into the indoor environment 01 through the air outlet 1123 after heat exchange of the indoor heat exchanger 14. In other embodiments, the fresh air outlet 1012 may also be in direct communication with the indoor environment 01.
The indoor heat exchanger 14 can exchange heat with air in the indoor return air duct 112, and the fresh air heat exchanger 11 can exchange heat with air in the fresh air duct 101. Wherein, the fresh air heat exchanger 11 and the indoor heat exchanger 14 can be used for synchronous heat exchanger. In addition, the air conditioner may further include a fluid switch 18 connected in series with the fresh air heat exchanger 11 to control the refrigerant to pass through or not pass through the fresh air heat exchanger 11. The fluid switch 18 may be embodied as a solenoid valve or the like. Specifically, in order to ensure the control accuracy and the system stability, the fluid switch 18 may include a first solenoid valve and a second solenoid valve, which are respectively disposed at two ends of the branch where the fresh air heat exchanger 11 and the first electronic expansion valve 15 are located. When the fluid switch 18 is turned on, the refrigerant can exchange heat with the air in the fresh air duct 101 through the fresh air heat exchanger 11, and when the fluid switch 18 is turned off, the refrigerant cannot exchange heat with the air in the fresh air duct 101 through the fresh air heat exchanger 11. The fluid switch 18 may be turned on by default when a fresh air command is received, or may be turned on when a temperature parameter, an environmental parameter, or the like reaches a preset condition after the fresh air command is received.
Specifically, when the air conditioner is in a cooling mode and a user does not start the fresh air function, the fluid switch 18 is turned off, the four-way valve 17 is in a first conduction state, the refrigerant is compressed into high-temperature and high-pressure gas in the compressor 12, the high-temperature and high-pressure gas passes through the four-way valve 17 and then passes through the outdoor heat exchanger 13, the refrigerant flowing out of the outdoor heat exchanger 13 does not pass through the branch where the fresh air heat exchanger 11 is located, so that the fresh air heat exchanger 11 does not work on the air in the fresh air duct 101, only the air is throttled and reduced by the second electronic expansion valve 16, and finally the air returns to the compressor 12 through the indoor heat exchanger 14 and the four-way valve 17, wherein the indoor heat exchanger 14 cools the air in the indoor return air duct 112. When the air conditioner is in a cooling mode and a user selects a fresh air function, the fluid switch 18 is turned on, the four-way valve 17 is in a first conduction state, after the refrigerant comes out of the outdoor heat exchanger 13, a part of the refrigerant flows through the first electronic expansion valve 15 and the fresh air heat exchanger 11 to cool the air in the fresh air duct 101, the other part of the refrigerant flows through the second electronic expansion valve 16 and the indoor heat exchanger 14 to cool the air in the indoor return air duct 112, and finally the refrigerant returns to the compressor 12 through the four-way valve 17. When the air conditioner is in a heating mode and a user does not start the fresh air function, the fluid switch 18 is turned off at the moment, the four-way valve 17 is switched to the second conduction state, the refrigerant passes through the indoor heat exchanger 14, then passes through the second electronic expansion valve 16 and the outdoor heat exchanger 13 and finally returns to the compressor 12, the refrigerant does not pass through the fresh air heat exchanger 11, the fresh air heat exchanger 11 does not work on the air in the fresh air duct 101, and the air in the indoor return air duct 112 is heated only by the refrigerant in the indoor heat exchanger 14. When the air conditioner is in a heating mode and the user starts the fresh air function, the fluid switch 18 and the four-way valve 17 are switched to the second conduction state, and after the refrigerant comes out of the four-way valve 17, a part of the refrigerant flows through the fresh air heat exchanger 11 and the first electronic expansion valve 15, and returns to the compressor 12 through the outdoor heat exchanger 13 and the four-way valve 17.
Further, the air conditioner also comprises a control device. In an embodiment of the present invention, referring to fig. 3, the control device includes: a processor 2001 such as a CPU, memory 2002, and the like. The memory 2002 may be a high-speed RAM memory or a non-volatile memory, such as a disk memory. The memory 2002 may alternatively be a storage device separate from the processor 2001 described previously.
The processor 2001 may be connected to the first electronic expansion valve 15, the second electronic expansion valve 16, the indoor fan, the fresh air fan, the compressor 12, and the like, respectively, to control the operations of the above components.
In addition, the air conditioner further includes a plurality of temperature sensors 300, which may specifically include a first sensor, a second sensor, a third sensor, a fourth sensor, and the like, where the first sensor may be disposed at a return air inlet 1121 (i.e., the return air inlet 1121 of the indoor return air duct 112) of the air conditioner for detecting the temperature of the indoor environment 01; the second sensor may be disposed at a fresh air outlet 1012 of the fresh air duct 101 of the air conditioner, so as to detect a first outlet air temperature of the fresh air duct 101; the third sensor may be disposed at the air outlet 1123 of the air conditioner (i.e., the air outlet 1123 of the indoor air return duct 112) for detecting a second outlet air temperature of the air conditioner; the fourth sensor may be disposed at the refrigerant outlet of the outdoor heat exchanger 13 for detecting the outlet temperature of the outdoor heat exchanger 13. The processor 2001 is connected to the first sensor, the second sensor, the third sensor, and the fourth sensor, respectively, to acquire temperature data and control the operation of the corresponding components according to the acquired temperature data.
Those skilled in the art will appreciate that the device configuration shown in fig. 3 is not intended to be limiting of the device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 3, the memory 2002, which is a readable storage medium, may include an air conditioner control program therein. In the apparatus shown in fig. 3, the processor 2001 may be configured to call an air conditioner control program stored in the memory 2002 and perform operations of relevant steps of a control method of an air conditioner in the following embodiments.
Based on the air conditioner in the above embodiment, the embodiment of the invention further provides a control method of the air conditioner.
Referring to fig. 4, there is provided a first embodiment of a control method of an air conditioner of the present invention, including:
s10, acquiring a first outlet air temperature of the fresh air duct, a second outlet air temperature of the indoor return air duct and an indoor environment temperature;
and when the air conditioner is in a cooling mode or a heating mode and the fresh air function of the air conditioner is started, executing the step S10. Under this state, fresh air heat exchanger and indoor heat exchanger all can refrigerate or heat the air respectively, can acquire the temperature data that locate the temperature sensor detection of fresh air export, air conditioner air outlet and air conditioner return air inlet in real time or interval default time, obtain first air-out temperature, second air-out temperature and indoor ambient temperature respectively.
The first air outlet temperature is specifically the temperature of the fresh air blown out from the fresh air outlet of the fresh air duct after heat exchange by the fresh air heat exchanger, and is the temperature of the fresh air entering the indoor return air duct in the air conditioner. The second air outlet temperature is specifically the temperature of the indoor environment acted by the air which is blown to the air conditioner after the air in the indoor air return duct exchanges heat through the indoor heat exchanger. The indoor ambient temperature is specifically the temperature in the space in which the air conditioner is acting.
And step S20, adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first air outlet temperature, the second air outlet temperature and the indoor environment temperature.
And pre-setting corresponding relations among the first air outlet temperature, the second air outlet temperature and the indoor environment temperature, the opening degree of the first electronic expansion valve, the adjustment mode and the adjustment amplitude of the opening degree of the second electronic expansion valve are pre-established. Specifically, the fresh air of the air in the outdoor environment after being subjected to heat exchange by the fresh air heat exchanger and the indoor air are mixed through the quantity relation among the first air outlet temperature, the second air outlet temperature and the indoor environment temperature, the size relation among the two air outlet temperatures, the quantity relation among the two air outlet temperatures and the like, the heat exchange energy efficiency of cold air or hot air required by the indoor environment is obtained after the indoor return air is subjected to heat exchange by the indoor heat exchanger, and the matching adjustment mode (opening increasing, opening reducing or current opening maintaining) and/or the adjustment range (opening value required to be increased or reduced) of the opening of the first electronic expansion valve and the opening of the second electronic expansion valve, which are different, are determined based on the reflected heat exchange energy efficiency and aiming at improving the heat exchange energy efficiency, and are used as the preset corresponding relation.
Based on the preset corresponding relationship, the quantity relationship among the currently acquired first outlet air temperature, the second outlet air temperature and the indoor environment temperature, the size relationship among the first outlet air temperature, the second outlet air temperature and the indoor environment temperature, the quantity relationship among the first outlet air temperature, the second outlet air temperature and the indoor environment temperature, and the like are determined, so that the adjusting modes of the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve can be determined, and in addition, the adjusting ranges of the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve can also be determined.
In the air conditioner with the refrigerating and heating functions, the fresh air has different influences on the heat exchange energy efficiency of the indoor return air in different heat exchange modes (refrigerating mode or heating mode), so different preset corresponding relations can be correspondingly established in different heat exchange modes. Therefore, the corresponding preset corresponding relation can be obtained based on the current heat exchange mode, and the current adjusting mode, adjusting amplitude and the like of the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve are determined according to the obtained preset corresponding relation.
The control method of the air conditioner provided by the embodiment of the invention is applied to the air conditioner provided with an indoor heat exchanger and a fresh air heat exchanger which are connected in parallel, the flow of a refrigerant flowing through the indoor heat exchanger in the air conditioner and the flow of the refrigerant flowing through the fresh air heat exchanger can be independently controlled through a first electronic expansion valve and a second electronic expansion valve respectively, and fresh air of an outdoor environment is subjected to heat exchange through the fresh air heat exchanger and then is mixed with indoor air, wherein the opening degrees of the first electronic expansion valve and the second electronic expansion valve are cooperatively adjusted according to a first air outlet temperature of a fresh air duct, a second air outlet temperature of an indoor return air duct and the indoor environment temperature, so that the weakening of the heat exchange capacity of the fresh air on the indoor heat exchanger is reduced, and meanwhile, after the indoor heat exchanger is matched with the fresh air heat exchanger to exchange the fresh air and the indoor return air, the air outlet of the air conditioner has higher heat exchange on the indoor environment, and the heat exchange efficiency of the air conditioner is improved when the fresh air is introduced.
Further, based on the first embodiment, a second embodiment of the control method of the air conditioner of the present application is proposed. In the second embodiment, referring to fig. 5, the step S20 includes:
step S21, determining the magnitude relation between the first air outlet temperature and the indoor environment temperature, and determining the temperature difference value between the second air outlet temperature and the indoor environment temperature;
the magnitude relation between the first air-out temperature and the indoor environment temperature comprises that the first air-out temperature is greater than the indoor environment temperature, and the first air-out temperature is less than the indoor environment temperature. The temperature difference value specifically refers to an absolute value of a temperature difference between the second outlet air temperature and the indoor ambient temperature.
And S22, adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the size relation and the temperature difference value.
The relationship between the first outlet air temperature and the indoor environment temperature can reflect the influence of the mixed fresh air duct and the indoor air (the air in the indoor return air duct or the air in the indoor environment) on the heat exchange energy efficiency of the air conditioner. And under different heat exchange modes, the influence of the same size relation on indoor heat exchange energy efficiency is different. For example, in the heating mode, if the first outlet air temperature is lower than the indoor ambient temperature, it indicates that the fresh air can reduce the heat exchange efficiency of the air conditioner for the indoor air, and if the first outlet air temperature is higher than the indoor ambient temperature, it indicates that the fresh air can improve the heat exchange efficiency of the air conditioner for the indoor air. The temperature difference value between the second outlet air temperature and the indoor environment temperature can reflect the heat exchange efficiency of the air conditioner for exchanging heat for the air in the indoor environment without being influenced by fresh air. The larger the temperature difference value is, the larger the heat exchange efficiency is; the smaller the temperature difference value, the smaller the heat exchange efficiency. Therefore, based on different size relationships and different temperature difference values, the adjustment modes, adjustment ranges and the like of the first electronic expansion valve and the second electronic expansion valve required by the current heat exchange energy efficiency of the air conditioner can be comprehensively determined, so that the air conditioner can be maintained at high heat exchange energy efficiency after fresh air is input.
In this embodiment, through the above-mentioned size relationship and temperature difference value, the influence of the fresh air processed by the fresh air heat exchanger on the heat exchange efficiency of the indoor air during the operation of the indoor heat exchanger can be accurately evaluated, wherein the influence of the fresh air entering the indoor return air duct on the heat exchange efficiency of the indoor heat exchanger can be accurately evaluated when the indoor return air duct is communicated with the fresh air duct, so that the opening degrees of the two electronic expansion valves are adjusted based on the size relationship and the temperature difference value, the opening degree adjustment is more accurate, the negative influence of the fresh air introduction on the heat exchange efficiency of the air conditioner is effectively reduced, and the air conditioner can be ensured to maintain higher heat exchange efficiency when the fresh air is introduced.
In order to enable the adjustment of the two electronic expansion valves to be more accurate, and to achieve the purpose of more accurately and effectively maintaining the air conditioner at higher heat exchange energy efficiency. Specifically, step S22 includes: and adjusting the opening degree of the first electronic expansion valve according to the size relation, and adjusting the opening degree of the second electronic expansion valve according to the size relation and the temperature difference value.
Because the opening of the first electronic expansion valve directly influences the heat exchange effect of the fresh air heat exchanger on outdoor fresh air, the adjustment mode (increasing, reducing or maintaining unchanged) of the opening of the first electronic expansion valve can be correspondingly determined based on the size relation, so that the influence of the air outlet of the fresh air channel on the heat exchange of indoor ambient air can be accurately adjusted through the action of the fresh air heat exchanger, and the weakening of the heat exchange energy efficiency of the fresh air to the air conditioner can be effectively reduced. Specifically, a preset relationship between the first outlet air temperature and the indoor environment temperature may be preset, when the magnitude relationship between the first outlet air temperature and the indoor environment temperature is the preset relationship, it may be indicated that the heat exchange efficiency of the indoor heat exchanger is reduced due to the introduction of the fresh air, and when the magnitude relationship between the first outlet air temperature and the indoor environment temperature is opposite to the preset relationship, it may be indicated that the heat exchange efficiency of the indoor heat exchanger may be improved due to the introduction of the fresh air. Therefore, when the magnitude relation between the first outlet air temperature and the indoor environment temperature is consistent with the preset relation, the first electronic expansion valve can be controlled to increase the opening degree, so that the reduction of the heat exchange energy efficiency caused by outlet air of the fresh air duct is reduced; when the size relation between the first air outlet temperature and the indoor environment temperature determined at present is inconsistent (namely opposite) to the preset relation, the first electronic expansion valve can be controlled to reduce the opening degree, so that the energy consumption of the air conditioner is reduced, and meanwhile, the heat exchange efficiency of the indoor heat exchanger to the indoor return air is ensured, and the heat exchange efficiency of the air conditioner is improved when fresh air is introduced.
The fresh air and the indoor return air after heat exchange of the fresh air heat exchanger are mixed in an indoor return air duct of the air conditioner, the heat exchange output capacity of the indoor heat exchanger is required and is determined based on the comprehensive result of the heat exchange requirements of the fresh air and the indoor return air, therefore, the adjusting mode (increasing, reducing or maintaining unchanged) of the second electronic expansion valve can be correspondingly determined based on the size relation and the temperature difference value, the indoor heat exchanger can exchange heat with the air after the fresh air and the indoor return air are mixed, and the heat exchange requirements of the indoor environment can be met by the air outlet of the air conditioner. Specifically, when the magnitude relation is consistent with the preset relation and the temperature difference value is less than or equal to a preset threshold value, controlling the second electronic expansion valve to increase the opening degree; and when the size relation is inconsistent with the preset relation and the temperature difference value is less than or equal to a preset threshold value, controlling the second electronic expansion valve to reduce the opening degree. The preset threshold may be set according to actual requirements, for example, may be set to one of 2 to 3 degrees celsius.
The temperature difference value is smaller than or equal to a preset threshold value, the heat exchange capacity requirement of the indoor heat exchanger is smaller, the heat exchange output capacity of the indoor heat exchanger is smaller at the moment, under the condition, if the size relation is consistent with the preset relation, the weakening effect of the air outlet of the fresh air duct on the heat exchange efficiency of the indoor heat exchanger is larger, therefore, the opening degree of the second electronic expansion valve needs to be increased while the weakening effect of the fresh air is reduced based on the adjustment of the first electronic expansion valve, the indoor heat exchanger is guaranteed to have enough heat exchange capacity to exchange heat for the air in the indoor return air duct, and the air conditioner is guaranteed to have higher energy efficiency on the adjustment of the indoor environment air. In addition, under the condition that the temperature value is smaller than or equal to the preset threshold value, if the size relation is inconsistent with the preset relation, the temperature trend of the air in the indoor return air duct required by the indoor environment can be changed under the heat exchange effect of the air outlet of the fresh air duct before the air in the indoor return air duct does not pass through the heat exchange of the indoor heat exchanger, the air outlet based on the fresh air duct can be matched with the indoor heat exchanger for heat exchange to improve the heat exchange efficiency of the indoor return air, the opening degree of the first electronic expansion valve can be reduced, the opening degree of the second electronic expansion valve can be reduced, the energy consumption of the air conditioner can be reduced, the heat exchange efficiency of the indoor environment air can be ensured, and the heat exchange efficiency of the air conditioner can be improved.
In other embodiments, when the temperature difference value is greater than the preset threshold value, it indicates that the heat exchange capacity requirement of the indoor heat exchanger is greater, and at this time, the heat exchange output capacity of the indoor heat exchanger is greater, and if the magnitude relation is consistent with the preset relation, the heat exchange energy efficiency of the indoor heat exchanger by the outlet air of the fresh air duct is weakened, so that the current opening degree of the second electronic expansion valve is maintained or increased while the weakening effect of the fresh air is reduced based on the adjustment of the first electronic expansion valve, so as to ensure that the indoor heat exchanger has sufficient heat exchange capacity to exchange heat with the air in the indoor return air duct, and ensure that the air conditioner has higher energy efficiency in adjusting the indoor ambient air. In addition, when the temperature difference value is greater than the preset threshold value, even if the size relation is inconsistent with the preset relation, the current opening degree of the second electronic expansion valve can be maintained or increased due to the fact that the current heat exchange capacity requirement is large, so that the indoor heat exchanger can be guaranteed to have enough heat exchange capacity to exchange heat for air in the indoor return air duct, and the air conditioner can be guaranteed to have high energy efficiency in adjusting indoor environment air.
Further, in the second embodiment, when the opening degrees of the first electronic expansion valve and the second electronic expansion valve are adjusted, the opening degrees of the first electronic expansion valve and the second electronic expansion valve may be adjusted according to a preset opening degree adjustment value. In addition, in order to adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve more accurately, the adjustment range of the first electronic expansion valve may be determined according to the first outlet air temperature and the indoor ambient temperature, or the adjustment range of the first electronic expansion valve may be determined according to the first outlet air temperature, the indoor ambient temperature, and the second outlet air temperature, or the adjustment range of the second electronic expansion valve may be determined according to the first outlet air temperature, the indoor ambient temperature, and the second outlet air temperature. The adjusting ranges of the first electronic expansion valve and the second electronic expansion valve are determined based on the parts or the whole of the first air outlet temperature, the indoor environment temperature and the second air outlet temperature, so that the two electronic expansion valves can be accurately adjusted, the influence of fresh air on indoor environment heat exchange can be effectively avoided under the matching heat exchange effect of the fresh air heat exchanger and the indoor heat exchanger, and the heat exchange efficiency of the air conditioner when the fresh air is introduced is improved.
Further, based on the second embodiment described above. A third embodiment of the control method of an air conditioner of the present application is presented. In the second embodiment, before step S22, the method further includes: acquiring a current operation mode of the air conditioner; and acquiring the preset relation according to the operation mode. Specifically, the operation state of the air conditioner can be divided into a plurality of operation modes according to different adjustment effects of the air conditioner on the indoor environment. For example, the operation mode may specifically include a cooling mode, a heating mode, and the like. Because under different modes, the influence of the air outlet temperature of different fresh air channels on the heat exchange energy efficiency of the air in the indoor return air channel is different. Therefore, different preset relationships can be correspondingly set in different operation modes. Specifically, when the operation mode is a heating mode, the preset relationship is that the indoor environment temperature is greater than the first outlet air temperature; when the operation mode is a refrigeration mode, the preset relation is that the indoor environment temperature is lower than the first outlet air temperature.
In this embodiment, different heat exchange modes correspond to different preset modes, so that the air conditioner with multiple operation modes can improve the heat exchange energy efficiency of the air conditioner when fresh air is introduced in different operation modes.
Further, based on any of the above embodiments, a fourth embodiment of the control method of the air conditioner of the present application is provided. In the fourth embodiment, referring to fig. 6, after step S10, the method further includes:
step S201, determining the magnitude relation between the first air outlet temperature and the indoor environment temperature;
the relationship between the sizes here and the relationship between the sizes in the second embodiment are the same concept, and are not described herein again.
And S202, adjusting the running frequency of the compressor according to the size relation.
Because different size relations represent that the influence of new trend to the heat transfer efficiency of air conditioner is different, consequently can be based on the adjustment mode that different size relations correspond the operating frequency who is provided with different compressors. Wherein, because under different heat exchange modes, the influence that same size relation represents is different. Therefore, step S202 may specifically include: when the air conditioner is in a heating mode currently, if the indoor environment temperature is lower than the first outlet air temperature, controlling the compressor to reduce the operation frequency; and when the air conditioner is in a refrigeration mode at present, if the indoor environment temperature is higher than the first air outlet temperature, controlling the compressor to reduce the running frequency.
In this embodiment, besides adjustment through the electronic expansion valve, linkage control is performed on a compressor of the air conditioner based on the magnitude relation between the first outlet air temperature and the indoor environment temperature, so that the heat exchange energy efficiency of the air conditioner when fresh air is introduced is further improved. The running frequency of the compressor is reduced when the outlet air of the fresh air duct promotes the heat exchange efficiency of the air conditioner, so that the energy consumption output of the air conditioner is reduced, the air conditioner can have higher heat exchange efficiency, and the improvement of the heat exchange efficiency of indoor air when fresh air enters is realized.
Further, based on any of the embodiments described above, a fifth embodiment of the control method of the air conditioner according to the present application is provided. In the fifth embodiment, referring to fig. 7, after step S10, the method further includes:
step S20a, determining the magnitude relation between the first outlet air temperature and the indoor environment temperature;
the size relationship here is the same as that in the second embodiment, and is not described herein again.
And S20b, adjusting the air output of the fresh air outlet according to the size relation.
Because the influence of different size relation sign new trend to the heat transfer efficiency in the indoor return air wind channel is different, consequently can be based on the adjustment mode that the size relation correspondence of difference was provided with the air output of different new trend exports. It should be noted that the adjustment of the air output of the fresh air outlet can be realized by a specifically arranged air guide component in the air conditioner. Specifically, when a fresh air fan is arranged in the fresh air duct, the rotating speed of the fresh air fan can be adjusted, and the air output of the fresh air outlet can be adjusted. For example, the rotating speed of the fresh air fan is reduced, and the air output of the fresh air outlet is reduced; the rotating speed of the fresh air fan is improved, and the air output of the fresh air outlet is improved. In addition, in other embodiments, when the fresh air port is provided with the air valve, the adjustment of the air output of the fresh air outlet can be realized by controlling the size of the opening of the air valve.
The influence of the same size relation on the heat exchange energy efficiency of the air in the indoor return air duct is different under different heat exchange modes. Thus, step S20b may specifically include: when the air conditioner is in a heating mode currently, if the indoor environment temperature is higher than the first air outlet temperature, the air outlet quantity of a fresh air outlet is reduced; when the air conditioner is in a refrigeration mode at present, if the indoor environment temperature is lower than the first air outlet temperature, the air outlet quantity of the fresh air outlet is reduced. In addition, in the heating mode, when the indoor environment temperature is lower than the first air outlet temperature, the air outlet quantity of the fresh air outlet can be maintained or even increased according to the requirement; under the refrigeration mode, when indoor ambient temperature is greater than first air-out temperature, can maintain the air output that increases even the new trend export according to the demand.
In this embodiment, except through the adjustment of electronic expansion valve, still carry out coordinated control to the fresh air volume that gets into indoor return air duct based on the big or small relation of first air-out temperature and indoor ambient temperature to the heat transfer efficiency of air conditioner when further improving and introducing the fresh air. The air outlet quantity is reduced when the air outlet of the fresh air duct weakens the heat exchange efficiency of the air conditioner, so that the negative influence of fresh air on the heat exchange efficiency of the air conditioner is further reduced, and the heat exchange efficiency of indoor air is improved when fresh air enters.
Further, based on any of the above embodiments, a sixth embodiment of the control method of the air conditioner of the present application is provided. In the sixth embodiment, referring to fig. 8, before step S20, the method further includes:
s01, when the air conditioner is in a heating mode, acquiring the outlet temperature of the outdoor heat exchanger;
when the outlet temperature is greater than a preset temperature threshold value, executing a step S20; and when the outlet temperature is less than or equal to a preset temperature threshold and the preset time length is maintained, executing step S02.
In the heating mode, the current environment temperature is low, and the air conditioner is easy to frost. Therefore, at this time, the temperature data detected by the temperature sensor at the refrigerant outlet of the outdoor heat exchanger can be acquired as the outlet air temperature.
If the outlet temperature is higher than the preset temperature threshold, it indicates that the air conditioner is not easy to frost, so the air conditioner can maintain a normal heating mode, and step S20 is executed; the outlet temperature is less than or equal to the preset temperature threshold value, and the preset time is maintained, which indicates that the air conditioner frosts, and particularly the fresh air heat exchanger is used as an evaporator at the moment and is communicated with the outdoor environment, so that the temperature of the evaporator is increased by reducing the opening degree of the first electronic expansion valve, and the frost on the surface of the evaporator is melted.
The preset temperature threshold may be based on the current environmental conditions (temperature, humidity, air pressure, etc.) of the air conditioner.
And S02, controlling the opening degree of the first electronic expansion valve to be reduced.
In this embodiment, when the air conditioner heats, can effectively defrost the fresh air heat exchanger through above-mentioned mode, improve the stability of air conditioner operation.
Further, based on the above sixth embodiment, a seventh embodiment of the control method of the air conditioner of the present application is proposed. In the seventh embodiment, referring to fig. 9, when the outlet temperature is less than or equal to the preset temperature threshold and the preset duration is maintained, before performing step S02, the method further includes:
step S001, determining a preset opening threshold according to the indoor environment temperature and the first outlet air temperature;
the preset opening threshold value is the minimum opening value of the electronic expansion valve for ensuring that the first outlet air temperature is greater than the indoor environment temperature. Specifically, a preset opening threshold value is determined according to a temperature difference obtained by subtracting the first outlet air temperature from the current indoor environment temperature. The larger the temperature difference is, the larger the corresponding preset opening threshold value is; the smaller the temperature difference is, the smaller the corresponding preset opening threshold value is.
Step S002, judging whether the current opening degree of the first electronic expansion valve is larger than or equal to the preset opening degree threshold value;
if the current opening degree is larger than or equal to the preset opening degree threshold value, executing the step S02; and if the current opening degree is smaller than the preset opening degree threshold value, executing the step S003.
The current opening degree is larger than or equal to the preset opening degree threshold value, which indicates that the current opening degree of the first electronic expansion valve can be continuously reduced, and the temperature of the fresh air heat exchanger can be effectively increased to realize defrosting; the current opening degree is smaller than the preset opening degree threshold value, which indicates that the opening degree of the current first electronic expansion valve cannot be continuously reduced, the temperature of the fresh air heat exchanger cannot be continuously increased, and the frost cannot be effectively melted in the state, so that the air conditioner can be switched from heating operation to cooling operation. The air conditioner operates in a refrigerating mode, the fresh air heat exchanger is switched to the condenser from the evaporator, the temperature is increased, and effective defrosting of the surface of the fresh air heat exchanger is achieved.
And S003, controlling the air conditioner to perform refrigeration operation.
In this embodiment, based on the comparison between the current opening degree of the first electronic expansion valve and the preset opening degree threshold, defrosting of the fresh air heat exchanger is realized on the premise that the heating operation of the air conditioner is not affected as much as possible; and when the defrosting is not completed yet to the maximum extent under the heating mode, the air conditioner is switched to the refrigerating operation, so that the heat exchange requirement of the air conditioner is ensured, and the effective defrosting of the air conditioner is realized.
In addition, an embodiment of the present invention further provides a readable storage medium, where an air conditioner control program is stored, and the air conditioner control program, when executed by a processor, implements the relevant steps of any embodiment of the above method for controlling an air conditioner.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (17)

1. The control method of the air conditioner is characterized in that the air conditioner comprises a fresh air heat exchanger, a compressor, an outdoor heat exchanger and an indoor heat exchanger, wherein the compressor, the outdoor heat exchanger and the indoor heat exchanger are sequentially connected to form a refrigerant circulation loop;
the control method of the air conditioner comprises the following steps:
acquiring a first air outlet temperature of the fresh air duct, a second air outlet temperature of the indoor return air duct and an indoor environment temperature;
and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature and the indoor environment temperature, so that the first electronic expansion valve can independently control the flow of the refrigerant flowing through the indoor heat exchanger, and the second electronic expansion valve can independently control the flow of the refrigerant flowing through the fresh air heat exchanger.
2. The method of claim 1, wherein the adjusting the opening degrees of the first and second electronic expansion valves according to the first outlet air temperature, the second outlet air temperature, and the indoor ambient temperature comprises:
determining the magnitude relation between the first air outlet temperature and the indoor environment temperature, and determining the temperature difference value between the second air outlet temperature and the indoor environment temperature;
and adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the size relation and the temperature difference value.
3. The control method of an air conditioner according to claim 2, wherein the step of adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the magnitude relationship and the temperature difference value comprises:
and adjusting the opening degree of the first electronic expansion valve according to the size relation, and adjusting the opening degree of the second electronic expansion valve according to the size relation and the temperature difference value.
4. The control method of an air conditioner according to claim 3, wherein the step of adjusting the opening degree of the first electronic expansion valve according to the magnitude relation comprises:
when the size relation is consistent with a preset relation, controlling the first electronic expansion valve to increase the opening degree;
and when the size relation is inconsistent with the preset relation, controlling the first electronic expansion valve to reduce the opening degree.
5. The control method of an air conditioner according to claim 4, wherein the step of adjusting the opening degree of the second electronic expansion valve according to the magnitude relation and the temperature difference value comprises:
when the size relation is consistent with the preset relation and the temperature difference value is smaller than or equal to a preset threshold value, controlling the second electronic expansion valve to increase the opening degree;
and when the size relation is inconsistent with the preset relation and the temperature difference value is less than or equal to a preset threshold value, controlling the second electronic expansion valve to reduce the opening degree.
6. The method of controlling an air conditioner according to claim 4, wherein the step of adjusting the opening degree of the first electronic expansion valve according to the magnitude relationship is preceded by the step of:
acquiring a current operation mode of the air conditioner;
and acquiring the preset relation according to the operation mode.
7. The control method of an air conditioner according to claim 6, wherein the step of obtaining the preset relationship according to the operation mode includes:
when the operation mode is a heating mode, the preset relation is that the indoor environment temperature is higher than the first air outlet temperature;
when the operation mode is a refrigeration mode, the preset relation is that the indoor environment temperature is lower than the first outlet air temperature.
8. The method as claimed in any one of claims 1 to 7, wherein after the step of obtaining the first outlet temperature of the fresh air duct, the second outlet temperature of the indoor return air duct and the indoor ambient temperature, the method further comprises:
determining the magnitude relation between the first outlet air temperature and the indoor environment temperature;
and adjusting the running frequency of the compressor according to the size relation.
9. The control method of an air conditioner according to claim 8, wherein the step of adjusting the operating frequency of the compressor according to the magnitude relation:
when the air conditioner is in a heating mode currently, if the indoor environment temperature is lower than the first air outlet temperature, controlling the compressor to reduce the operation frequency;
and when the air conditioner is in a refrigeration mode at present, if the indoor environment temperature is higher than the first air outlet temperature, controlling the compressor to reduce the running frequency.
10. The method as claimed in any one of claims 1 to 7, wherein after the step of obtaining the first outlet temperature of the fresh air duct, the second outlet temperature of the indoor return air duct and the indoor ambient temperature, the method further comprises:
determining the magnitude relation between the first outlet air temperature and the indoor environment temperature;
and adjusting the air output of the fresh air outlet according to the size relation.
11. The method of any one of claims 1 to 7, wherein the step of adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature, and the indoor ambient temperature is preceded by the step of:
when the air conditioner is in a heating mode, acquiring the outlet temperature of the outdoor heat exchanger;
when the outlet temperature is greater than a preset temperature threshold value, executing the step of adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the first outlet air temperature, the second outlet air temperature and the indoor environment temperature;
and when the outlet temperature is less than or equal to a preset temperature threshold and the preset time length is maintained, controlling the first electronic expansion valve to reduce the opening degree.
12. The control method of an air conditioner according to claim 11, wherein, when the outlet temperature is less than or equal to a preset temperature threshold and a preset time duration is maintained, before the step of controlling the first electronic expansion valve to decrease the opening degree, further comprising:
determining a preset opening threshold according to the indoor environment temperature and the first outlet air temperature;
judging whether the current opening degree of the first electronic expansion valve is larger than or equal to the preset opening degree threshold value or not;
if the current opening degree is larger than or equal to the preset opening degree threshold value, executing the step of controlling the first electronic expansion reducing opening degree;
and if the current opening degree is smaller than the preset opening degree threshold value, controlling the air conditioner to run in a refrigerating mode.
13. A control device, characterized in that the control device comprises: a memory, a processor and an air conditioner control program stored on the memory and executable on the processor, the air conditioner control program when executed by the processor implementing the steps of the control method of the air conditioner according to any one of claims 1 to 12.
14. A wall-penetrating air conditioner, characterized in that, the wall-penetrating air conditioner comprises the control device as claimed in claim 13, a fresh air heat exchanger, a compressor, an outdoor heat exchanger and an indoor heat exchanger which are connected in sequence to form a refrigerant circulation loop;
the fresh air heat exchanger is connected with the indoor heat exchanger in parallel, the fresh air heat exchanger is connected with a first electronic expansion valve in series, and the indoor heat exchanger is connected with a second electronic expansion valve in series; the first electronic expansion valve, the second electronic expansion valve and the compressor are all connected with the control device;
the air conditioner further comprises a shell, a fresh air duct and an indoor return air duct are formed in the shell, the fresh air heat exchanger is arranged in the fresh air duct, and the indoor heat exchanger is arranged in the indoor return air duct.
15. The wall-penetrating air conditioner according to claim 14, wherein the fresh air duct has a fresh air inlet and a fresh air outlet, the indoor return air duct has a return air inlet, a fresh air inlet, and an air outlet, the fresh air inlet communicates with the outdoor environment, the fresh air outlet communicates with the fresh air inlet, and the return air inlet and the air outlet both communicate with the indoor environment.
16. A through-wall air conditioner as claimed in claim 14 further comprising a fluid switch connected in series with said fresh air heat exchanger.
17. A readable storage medium, characterized in that an air-conditioning control program is stored thereon, which, when executed by a processor, implements the steps of the control method of an air conditioner according to any one of claims 1 to 12.
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