CN115264784A - Air conditioner, control method thereof, and computer-readable storage medium - Google Patents
Air conditioner, control method thereof, and computer-readable storage medium Download PDFInfo
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- CN115264784A CN115264784A CN202110473247.5A CN202110473247A CN115264784A CN 115264784 A CN115264784 A CN 115264784A CN 202110473247 A CN202110473247 A CN 202110473247A CN 115264784 A CN115264784 A CN 115264784A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005057 refrigeration Methods 0.000 claims abstract description 62
- 238000001816 cooling Methods 0.000 claims description 49
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000004590 computer program Methods 0.000 claims description 7
- 239000003507 refrigerant Substances 0.000 abstract description 27
- 230000006870 function Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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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
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses an air conditioner and a control method thereof, and a computer readable storage medium, wherein the air conditioner comprises an outdoor heat exchanger and an outdoor fan, the outdoor heat exchanger comprises a plurality of heat exchange branches connected in parallel, and at least one heat exchange branch is provided with an on-off valve for controlling the on-off of the corresponding heat exchange branch, and the control method comprises the following steps: when the air conditioner is in a refrigeration mode, acquiring the outdoor environment temperature; if the outdoor environment temperature is less than or equal to the first preset temperature, controlling the outdoor fan to run at a reduced speed, and controlling the on-off valve to be in a conducting state so as to enable the air conditioner to be in a low-temperature refrigeration mode; after the air conditioner is in a low-temperature refrigeration mode, the outlet temperature of the outdoor heat exchanger is obtained, the on-off state of the on-off valve and the rotating speed of the outdoor fan are adjusted according to the outlet temperature and the outdoor environment temperature, the pressure of the refrigerant in the outdoor heat exchanger can be maintained within a reasonable range when the outdoor environment temperature is low, and therefore stable operation of the system is guaranteed.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an air conditioner, a control method of the air conditioner and a computer readable storage medium.
Background
Generally, the air conditioner operates in a cooling mode when the outdoor ambient temperature is high and operates in a heating mode when the outdoor ambient temperature is low, but in some special cases, the air conditioner needs to operate in the cooling mode even if the outdoor ambient temperature is low. When the air conditioner operates in a low-temperature environment, the pressure of the refrigerant in the outdoor heat exchanger is easily too low, so that the system cannot operate stably.
In the related art, when the outdoor environment temperature is low, the heat exchange performance of the outdoor heat exchanger is weakened by reducing the rotating speed of the outdoor fan, so that the pressure of the refrigerant in the outdoor heat exchanger is maintained in a reasonable range, but when the outdoor environment temperature is too low, the pressure of the refrigerant in the outdoor heat exchanger cannot be maintained in a reasonable range by reducing the rotating speed of the outdoor fan, and therefore the system cannot stably operate.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the first objective of the present invention is to provide a control method for an air conditioner, which can ensure that the pressure of the refrigerant in the outdoor heat exchanger is maintained within a reasonable range when the outdoor environment temperature is low, and ensure the stable operation of the system, so that the air conditioner can be suitable for low-temperature refrigeration in a larger temperature zone, the application occasions of the air conditioner for refrigeration in a low-temperature environment are expanded, and the refrigeration capacity and reliability of the air conditioner under the severe low-temperature refrigeration working condition are optimized.
A second object of the invention is to propose a computer-readable storage medium.
A third object of the present invention is to provide an air conditioner.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling an air conditioner, where the air conditioner includes an outdoor heat exchanger and an outdoor fan disposed corresponding to the outdoor heat exchanger, the outdoor heat exchanger includes a plurality of heat exchange branches connected in parallel, and at least one heat exchange branch is provided with an on-off valve for controlling on/off of the corresponding heat exchange branch, and the method includes the following steps: when the air conditioner is in a refrigeration mode, acquiring the outdoor environment temperature; if the outdoor environment temperature is less than or equal to a first preset temperature, controlling an outdoor fan to run at a reduced speed, and controlling an on-off valve to be in a conducting state so as to enable the air conditioner to be in a low-temperature refrigeration mode; and after the air conditioner is in a low-temperature refrigeration mode, acquiring the outlet temperature of the outdoor heat exchanger, and adjusting the on-off state of the on-off valve and the rotating speed of the outdoor fan according to the outlet temperature and the outdoor environment temperature.
According to the control method of the air conditioner, when the air conditioner is in a refrigeration mode, the outdoor environment temperature is obtained, when the outdoor environment temperature is less than or equal to the first preset temperature, the outdoor fan is controlled to operate in a speed reduction mode, the on-off valve is controlled to be in an on state, so that the air conditioner is in a low-temperature refrigeration mode, then the outlet temperature of the outdoor heat exchanger is obtained, and the on-off state of the on-off valve and the rotating speed of the outdoor fan are adjusted according to the outlet temperature and the outdoor environment temperature, so that the pressure of a refrigerant in the outdoor heat exchanger can be maintained within a reasonable range when the outdoor environment temperature is low, the stable operation of a system is guaranteed, the air conditioner can be suitable for low-temperature refrigeration in a larger temperature zone, the application occasion of the air conditioner in refrigeration in the low-temperature environment is expanded, and the refrigeration capacity and reliability of the air conditioner under the severe low-temperature refrigeration working condition are optimized.
According to one embodiment of the invention, the adjustment of the on-off state of the on-off valve and the rotation speed of the outdoor fan according to the outlet temperature and the outdoor environment temperature comprises the following steps: if the outlet temperature is less than or equal to the second preset temperature and greater than the third preset temperature, and the outdoor environment temperature is less than or equal to the first preset temperature, or the outlet temperature is less than or equal to the third preset temperature, and the outdoor environment temperature is less than or equal to the first preset temperature and greater than the fourth preset temperature, controlling the outdoor fan to continue to run at a reduced speed, and controlling the on-off valve to be in an on state; and if the outlet temperature is less than or equal to the third preset temperature and the outdoor environment temperature is less than or equal to the fourth preset temperature, controlling the rotating speed of the outdoor fan to be kept unchanged and controlling the on-off valve to be in an off state.
According to an embodiment of the present invention, when the on-off valve includes a plurality of, controlling the on-off valve in the off state includes: acquiring a first difference between the outlet temperature and a third preset temperature, and acquiring a second difference between the outdoor environment temperature and a fourth preset temperature; acquiring the number of the on-off valves in the off state according to the first difference value and the second difference value; and controlling the on-off valve to be in an off state according to the quantity.
According to one embodiment of the invention, the control of the speed reduction operation of the outdoor fan comprises the following steps: controlling the rotating speed of the outdoor fan to be reduced to a first preset rotating speed; controlling the outdoor fan to continue to operate at a reduced speed, comprising: and controlling the rotating speed of the outdoor fan to be reduced to a second preset rotating speed, wherein the second preset rotating speed is smaller than the first preset rotating speed.
According to an embodiment of the present invention, the control method of an air conditioner further includes: and if the outdoor environment temperature is higher than the first preset temperature, controlling the air conditioner to enter a cooling mode or a heating mode.
To achieve the above object, a second aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the above method.
According to the computer readable storage medium of the embodiment of the invention, the steps of the method are realized when the computer program stored on the computer readable storage medium is executed by the processor, the pressure of the refrigerant in the outdoor heat exchanger can be maintained within a reasonable range when the outdoor environment temperature is lower, and the stable operation of the system is ensured, so that the air conditioner can be suitable for low-temperature refrigeration of a larger temperature zone, the application occasion of the air conditioner for refrigeration in a low-temperature environment is expanded, and the refrigeration capacity and reliability of the air conditioner under the severe working condition of low-temperature refrigeration are optimized.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides an air conditioner, including an outdoor heat exchanger, an outdoor fan and a control device, where the outdoor fan is disposed corresponding to the outdoor heat exchanger, the outdoor heat exchanger includes a plurality of heat exchange branches connected in parallel, and at least one heat exchange branch is provided with an on-off valve for controlling on-off of the corresponding heat exchange branch; the control device is used for acquiring the outdoor environment temperature when the air conditioner is in a refrigeration mode, controlling the outdoor fan to run at a reduced speed when the outdoor environment temperature is less than or equal to a first preset temperature, controlling the on-off valve to be in a conducting state so as to enable the air conditioner to be in a low-temperature refrigeration mode, acquiring the outlet temperature of the outdoor heat exchanger after the air conditioner is in the low-temperature refrigeration mode, and adjusting the on-off state of the on-off valve and the rotating speed of the outdoor fan according to the outlet temperature and the outdoor environment temperature.
According to the air conditioner provided by the embodiment of the invention, when the air conditioner is in a refrigeration mode, the outdoor environment temperature is obtained, when the outdoor environment temperature is less than or equal to the first preset temperature, the outdoor fan is controlled to run at a reduced speed, the on-off valve is controlled to be in the on-state, so that the air conditioner is in a low-temperature refrigeration mode, then the outlet temperature of the outdoor heat exchanger is obtained, and the on-off state of the on-off valve and the rotating speed of the outdoor fan are adjusted according to the outlet temperature and the outdoor environment temperature, so that the pressure of the refrigerant in the outdoor heat exchanger can be maintained in a reasonable range when the outdoor environment temperature is lower, the stable running of a system is ensured, the air conditioner can be suitable for low-temperature refrigeration in a larger temperature zone, the application occasion of the air conditioner for refrigeration in the low-temperature environment is expanded, and the refrigeration capacity and reliability of the air conditioner under the severe low-temperature refrigeration working condition are optimized.
According to an embodiment of the present invention, the control device is specifically configured to, when adjusting the on-off state of the on-off valve and the rotation speed of the outdoor fan according to the outlet temperature and the outdoor environment temperature: if the outlet temperature is less than or equal to a second preset temperature and greater than a third preset temperature, and the outdoor environment temperature is less than or equal to a first preset temperature, or the outlet temperature is less than or equal to the third preset temperature, and the outdoor environment temperature is less than or equal to the first preset temperature and greater than a fourth preset temperature, controlling the outdoor fan to continue to run at a reduced speed, and controlling the on-off valve to be in an on state, wherein the second preset rotating speed is less than the first preset rotating speed; and if the outlet temperature is less than or equal to the third preset temperature and the outdoor environment temperature is less than or equal to the fourth preset temperature, controlling the rotating speed of the outdoor fan to be kept unchanged and controlling the on-off valve to be in an off state.
According to an embodiment of the present invention, when the on-off valve includes a plurality of on-off valves, the control device is specifically configured to, when controlling the on-off valve to be in the off state: acquiring a first difference between the outlet temperature and a third preset temperature, and acquiring a second difference between the outdoor environment temperature and a fourth preset temperature; acquiring the number of the on-off valves in the off state according to the first difference value and the second difference value; and controlling the on-off valve to be in an off state according to the quantity.
According to an embodiment of the present invention, the control device is further configured to control the air conditioner to enter a cooling mode or a heating mode when the outdoor ambient temperature is greater than a first preset temperature.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural view of an outdoor heat exchanger according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;
fig. 3 is a block diagram of an air conditioner according to an embodiment of the present invention.
Detailed Description
The present invention is described in detail below by way of embodiments, and the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout the drawings.
An air conditioner, a control method thereof, and a computer-readable storage medium according to embodiments of the present invention will be described with reference to the accompanying drawings.
In an embodiment of the invention, the air conditioner comprises an outdoor heat exchanger and an outdoor fan, wherein the outdoor fan and the outdoor heat exchanger are arranged correspondingly, the outdoor heat exchanger is provided with a plurality of heat exchange branches, the heat exchange branches are arranged in parallel, and at least one of the heat exchange branches is provided with an on-off valve which is used for controlling the on-off state of the corresponding heat exchange branch to be on or off.
For example, referring to fig. 1, the outdoor heat exchanger 100 has a main inlet pipe 101 and a main outlet pipe 102, a plurality of heat exchange branches 103 are disposed between the main inlet pipe 101 and the main outlet pipe 102, the plurality of heat exchange branches 103 are disposed in parallel, each heat exchange branch 103 may further include a plurality of heat exchange sub-branches, the plurality of heat exchange sub-branches are disposed in parallel, each heat exchange sub-branch includes a plurality of heat exchange tubes 104 sequentially connected, and an on-off valve 105 is disposed on at least one of the heat exchange branches 103, the on-off valve 105 is configured to control on/off of the corresponding heat exchange branch 103, that is, when the on-off state of the on-off valve 105 is on, the corresponding heat exchange branch 103 is in a heat exchange operating state, and when the on-off state of the on-off valve 105 is off, the corresponding heat exchange branch 103 is in a heat exchange operating stop state.
It can be understood that this application is not limited to this, if in concrete example, be equipped with a plurality of heat transfer branch roads between total intake pipe and total outlet duct, these a plurality of heat transfer branch roads are parallelly connected and set up, every heat transfer branch road also can not include a plurality of heat transfer subbranches, under this condition, every heat transfer branch road can all include a plurality of heat exchange tubes that connect gradually, and be equipped with the on-off valve on at least one heat transfer branch road wherein, this on-off valve is used for controlling the break-make of corresponding heat transfer branch road, under the on-off state of on-off valve is the circumstances of conducting, its corresponding heat transfer branch road is in heat transfer operating condition, and under the on-off state of on-off valve is the circumstances of disconnection, its corresponding heat transfer branch road is in heat transfer off state.
It should be noted that, in the present application, the operation modes of the air conditioner may include a heating mode, a cooling mode and a low-temperature cooling mode, where the heating mode refers to an operation mode in which the compressor presses the refrigerant into the indoor heat exchanger to perform liquefaction and heating, and the purpose of the operation of the heating mode is to raise the indoor temperature; the refrigeration mode is an operation mode that the compressor presses refrigerant into the outdoor heat exchanger to carry out liquefaction and heat release, and the refrigeration mode is operated to reduce the indoor temperature; the low temperature cooling mode refers to a cooling mode when the outdoor ambient temperature is low, and the cooling mode is operated to reduce the indoor temperature in a case where the outdoor ambient temperature is low.
Fig. 2 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention. Referring to fig. 2, the control method of the air conditioner may include the steps of:
step S201: when the air conditioner is in a cooling mode, the outdoor ambient temperature is acquired.
In a specific example, whether the air conditioner is in the cooling mode may be determined by the control device, and if so, the outdoor ambient temperature T4 is obtained, where the outdoor ambient temperature T4 is a basis for whether the air conditioner is to turn on the low-temperature cooling mode next, and the obtaining of the outdoor ambient temperature T4 may be detected by a temperature sensor disposed outdoors.
Step S202: and if the outdoor environment temperature is less than or equal to the first preset temperature, controlling the outdoor fan to reduce the rotating speed to operate, and controlling at least one on-off valve to be in a conducting state so as to enable the air conditioner to operate in a low-temperature refrigeration mode.
In one embodiment, the control method of an air conditioner further includes: in case that the outdoor ambient temperature is greater than the first preset temperature, the air conditioner may be controlled to enter a corresponding cooling mode or heating mode through the control device according to a preset condition regarding the outdoor ambient temperature. The first preset temperature is the highest outdoor environment temperature of the low-temperature refrigeration mode, and the first preset temperature can be calibrated according to actual conditions, for example, the first preset temperature can be 10 ℃.
Specifically, after the outdoor environment temperature T4 is acquired, the magnitude relationship between the outdoor environment temperature T4 and the first preset temperature Tset1 may be determined by the control device. In one case, if the outdoor ambient temperature T4 is less than or equal to the first preset temperature Tset1 (e.g., 10 ℃), the air conditioner is controlled to operate in the low-temperature cooling mode, which is specifically implemented as follows: on the one hand, the rotating speed of the outdoor fan is reduced, the rotating speed can be reduced to a first preset rotating speed V1, so that the heat exchange capacity of the outdoor heat exchanger is weakened, on the other hand, the on-off state of the on-off valve is controlled to be on through the control device, namely, under the condition that the outdoor environment temperature T4 is smaller than or equal to the first preset temperature Tset1, only the rotating speed of the outdoor fan needs to be reduced, further control is not needed through the on-off valve, the pressure of the refrigerant in the outdoor heat exchanger can be in a reasonable range, and therefore stable operation of the whole system under the low-temperature refrigeration mode is guaranteed.
In another case, if the outdoor ambient temperature T4 is higher than the first preset temperature Tset1 (e.g., 10 ℃), which indicates that the low-temperature cooling mode does not need to be operated currently, the control device may control the air conditioner to continue to operate in the cooling mode or control the air conditioner to operate in the heating mode according to the specific requirements of the user. As in the specific example, the first preset temperature Tset1 is set to 10 ℃, and if the outdoor ambient temperature T4 detected by the temperature sensor is greater than 10 ℃ and less than 20 ℃, the air conditioner may be controlled by the control means to operate in the heating mode; if the outdoor ambient temperature T4 is detected to be greater than 30 c by the temperature sensor, the air conditioner may be controlled by the control means to operate in a heating mode.
Step S203: when the air conditioner operates in a low-temperature refrigeration mode, the outlet temperature of the outdoor heat exchanger is obtained, and the rotating speed of the outdoor fan and the on-off state of the on-off valve are adjusted according to the outdoor environment temperature and the outlet temperature.
The outlet temperature T3 of the outdoor heat exchanger may be detected by a temperature sensor disposed at the outlet of the outdoor heat exchanger, and as shown in fig. 1, the outlet temperature T3 may be obtained by disposing a temperature sensor at the main outlet pipe 102.
That is, when the air conditioner operates in the low-temperature cooling mode, the rotation speed of the outdoor fan and the on-off state of the on-off valve are also adjusted in real time, so that the pressure of the refrigerant in the outdoor heat exchanger is kept within a reasonable range, and the whole system can keep a stable operation state, and particularly, the real-time adjustment mode and amplitude can be set according to the outdoor environment temperature T4 and the outlet temperature T3. Compared with the method for adjusting the rotating speed of the outdoor fan and the on-off state of the on-off valve according to the single outdoor environment temperature T4, the outdoor environment temperature T4 and the outlet temperature T3 are integrated to more closely reflect the actual working temperature of the outdoor heat exchanger, the actual working temperature of the outdoor heat exchanger directly influences the refrigerant pressure in the outdoor heat exchanger and whether the system can stably operate or not, therefore, the rotating speed of the outdoor fan and the on-off state of the on-off valve can be adjusted according to the outdoor environment temperature and the outlet temperature of the outdoor heat exchanger, the adjustment of the rotating speed of the outdoor fan and the on-off state of the on-off valve can be more accurate, and the stability of the whole system is better. Particularly, after the air conditioner is in a low-temperature refrigeration mode, the rotating speed of the outdoor fan is adjusted according to the outlet temperature and the outdoor environment temperature, so that the fan rotating speed association degree in the outdoor temperature reduction process can be more accurate.
In one embodiment, adjusting the rotation speed of the outdoor fan and the on-off state of the on-off valve according to the outdoor environment temperature and the outlet temperature comprises: if the outdoor environment temperature is greater than the fourth preset temperature and less than or equal to the first preset temperature, and the outlet temperature is less than or equal to the third preset temperature, or the outdoor environment temperature is less than or equal to the first preset temperature, and the outlet temperature is greater than the third preset temperature and less than or equal to the second preset temperature, controlling the outdoor fan to continue to reduce the rotating speed to operate through the control device, and controlling the on-off valve to be in a conducting state; if the outdoor environment temperature is less than or equal to the fourth preset temperature and the outlet temperature is less than or equal to the third preset temperature, the rotating speed of the outdoor fan is controlled to be unchanged through the control device, and the on-off state of the on-off valve is controlled to be off. The second preset temperature, the third preset temperature and the fourth preset temperature can be calibrated according to actual conditions, for example, the second preset temperature can be 2 ℃, the third preset temperature can be-10 ℃ and the fourth preset temperature can be-10 ℃.
Specifically, when the air conditioner operates in the low-temperature refrigeration mode, the outdoor ambient temperature T4 and the outlet temperature T3 of the outdoor heat exchanger can be acquired at preset time intervals (for example, 2 min), and the outdoor ambient temperature T4 and the outlet temperature T3 are judged according to preset conditions about the outdoor ambient temperature T4 and the outlet temperature T3, so that the rotating speed of the outdoor fan and the on-off state of the on-off valve are adjusted according to a judgment result. The adjustment can be specifically divided into two adjustment modes: the first adjustment mode is to further control the outdoor fan to operate at a reduced speed through the control device, so that the rotating speed of the outdoor fan can be reduced to a second preset rotating speed V2, wherein the second preset rotating speed V2 is lower than the first preset rotating speed V1, and the on-off valve is controlled to be in a conducting state. The adjustment method corresponds to two implementation conditions, one is that the outdoor environment temperature T4 is greater than the fourth preset temperature Tset4 and less than or equal to the first preset temperature Tset1, and the outlet temperature T3 of the outdoor heat exchanger is less than or equal to the third preset temperature Tset3, and the other is that the outdoor environment temperature T4 is less than or equal to the first preset temperature Tset1, and the outlet temperature T3 is greater than the third preset temperature Tset3 and less than or equal to the second preset temperature Tset2. The second adjustment mode is to control the rotating speed of the outdoor fan to be constant and control the on-off state of the on-off valve to be off, and the corresponding implementation conditions of the adjustment mode are that the outdoor environment temperature T4 is less than or equal to a fourth preset temperature Tset4, and the outlet temperature T3 of the outdoor heat exchanger is less than or equal to a third preset temperature Tset3.
When T4 is less than or equal to Tset1, tset3 is more than or equal to T3 and less than or equal to Tset2, or T3 is less than or equal to Tset3, tset4 is more than or equal to T4 and less than or equal to Tset1, controlling the outdoor fan to further reduce the rotating speed, and simultaneously controlling the on-off state of the on-off valve to be on, namely controlling the rotating speed of the outdoor fan to further reduce to adjust the pressure of the refrigerant in the outdoor heat exchanger so as to enable the pressure to be in a reasonable range; and when T3 is less than or equal to Tset3 and T4 is less than or equal to Tset4, controlling the rotating speed of the outdoor fan to be a current value and keeping the rotating speed constant, and simultaneously controlling the on-off state of the on-off valve to be off so as to adjust the pressure of the refrigerant in the outdoor heat exchanger by reducing the heat exchange area of the outdoor heat exchanger to enable the pressure to be within a reasonable range.
That is, compared with the case that the outdoor environment temperature T4 is less than or equal to the first preset temperature Tset1, when the actual working temperature of the outdoor heat exchanger is reduced by a small amount, the outdoor fan may be controlled to further reduce the rotation speed for operation; when the actual working temperature of the outdoor heat exchanger is reduced to a large extent, the on-off state of the on-off valve can be controlled to be off, so that the pressure of the refrigerant in the outdoor heat exchanger is maintained in a reasonable range in a low-temperature refrigeration mode, and the stable operation of the whole system can be ensured when the air conditioner operates in the low-temperature refrigeration mode.
In one embodiment, when the on-off valve includes a plurality, controlling the on-off valve in the off state includes: acquiring a first difference between a third preset temperature and an outlet temperature, and acquiring a second difference between a fourth preset temperature and an outdoor environment temperature; acquiring the number of on-off valves in an off state according to the first difference and the second difference; and then the on-off state of the on-off valve is controlled to be off according to the quantity.
That is, for an air conditioner having a plurality of on-off valves, the control of the number of disconnections of the on-off valves thereof may be performed in the following manner: in order to maintain the pressure of the refrigerant in the outdoor heat exchanger within a reasonable range when the air conditioner is in the low-temperature cooling mode, the number of on-off valves whose on-off states are off may be determined according to a preset condition with respect to the actual operating temperature of the outdoor heat exchanger. Specifically, the low temperature degree of the actual working temperature of the outdoor heat exchanger can be represented as a first difference value Δ T1 between the third preset temperature Tset3 and the outlet temperature T3, and a second difference value Δ T2 between the fourth preset temperature Tset4 and the outdoor environment temperature T4, so that the first difference value Δ T1 and the second difference value Δ T2 can be obtained by the control device, the number of the on-off valves with the on-off states being off can be obtained according to the sizes of the first difference value Δ T1 and the second difference value Δ T2, and the on-off states of the on-off valves are controlled to be off by the control device according to the obtained number, so as to change the heat exchange area of the outdoor heat exchanger, further maintain the pressure of the refrigerant of the outdoor heat exchanger in a reasonable range in the low-temperature refrigeration mode, so that the whole system can stably operate.
It is understood that, in the present application, when the outdoor ambient temperature T4 increases and/or the outlet temperature T3 increases, the air conditioner may be controlled in a control manner opposite to the foregoing one, and detailed description thereof is omitted here. It should be noted that, when the air conditioner operates in the low-temperature cooling mode, if the outdoor environment temperature T4 is greater than the first preset temperature Tset1, the air conditioner is controlled to exit the low-temperature cooling mode, and the air conditioner is controlled to enter the cooling mode or the air conditioner is controlled to enter the heating mode according to the corresponding preset temperature condition.
In summary, according to the control method of the air conditioner in the embodiment of the present invention, when the air conditioner is in the cooling mode, the outdoor environment temperature is obtained, if the outdoor environment temperature is less than or equal to the first preset temperature, the outdoor fan is controlled to operate at a reduced rotation speed, and at least one on-off valve is controlled to be in the on state, so that the air conditioner operates in the low-temperature cooling mode, and when the air conditioner operates in the low-temperature cooling mode, the outlet temperature of the outdoor heat exchanger is obtained, and the rotation speed of the outdoor fan and the on-off state of the on-off valve are adjusted according to the outdoor environment temperature and the outlet temperature. By the method, the refrigerating capacity and reliability of the air conditioner under the severe low-temperature refrigerating working condition are optimized, so that the air conditioner can be suitable for low-temperature refrigeration in a larger temperature area, and the application occasions of the air conditioner in low-temperature environment refrigeration are expanded.
In one embodiment, a computer-readable storage medium is provided, which has a computer program stored thereon, and a processor executes the computer program to implement the steps of the control method of the air conditioner as described above.
According to the computer readable storage medium of the embodiment of the invention, the steps of the method are realized when the processor executes the computer program stored on the storage medium, so that the pressure of the refrigerant in the outdoor heat exchanger can be maintained within a reasonable range when the outdoor environment temperature is low, the stable operation of the system is ensured, the air conditioner can be suitable for low-temperature refrigeration of a larger temperature zone, the application occasion of the air conditioner for refrigeration in a low-temperature environment is expanded, and the refrigeration capacity and reliability of the air conditioner under the severe low-temperature refrigeration working condition are optimized.
Fig. 3 is a block diagram of an air conditioner according to an embodiment of the present invention. Referring to fig. 3, the air conditioner 300 includes an outdoor heat exchanger 301, an outdoor fan 302, and a control device 303.
The outdoor heat exchanger 301 has a plurality of heat exchange branches, the heat exchange branches are arranged in parallel, each heat exchange branch can include a plurality of heat exchange sub-branches, the heat exchange sub-branches are arranged in parallel, each heat exchange sub-branch comprises a plurality of heat exchange tubes connected in sequence, at least one heat exchange branch is provided with an on-off valve, the on-off valve is used for controlling on-off of the corresponding heat exchange branch, namely, the corresponding heat exchange branch is in a heat exchange working state under the condition that the on-off state of the on-off valve is on, and the corresponding heat exchange branch is in a heat exchange stop state under the condition that the on-off state of the on-off valve is off. The outdoor fan 302 is disposed corresponding to the outdoor heat exchanger 301. The control device 303 is configured to obtain an outdoor environment temperature when the air conditioner is in the cooling mode, control the outdoor fan 302 to operate at a reduced rotation speed when the outdoor environment temperature is less than or equal to a first preset temperature, control an on/off state of at least one on/off valve to be on, enable the air conditioner to operate in the low-temperature cooling mode, obtain an outlet temperature of the outdoor heat exchanger 301 when the air conditioner operates in the low-temperature cooling mode, and adjust the rotation speed of the outdoor fan 302 and the on/off state of the on/off valve according to the outdoor environment temperature and the outlet temperature.
It can be understood that this application is not limited to this, if in concrete example, be equipped with a plurality of heat transfer branch roads between total intake pipe and total outlet duct, these a plurality of heat transfer branch roads are parallelly connected and set up, every heat transfer branch road can also not include a plurality of heat transfer sub-branch roads, under this condition, every heat transfer branch road can all include a plurality of heat exchange tubes that connect gradually, and be equipped with the on-off valve on at least one heat transfer branch road wherein, this on-off valve is used for controlling the break-make of corresponding heat transfer branch road, under the on-off state of on-off valve is the circumstances of switching on, its corresponding heat transfer branch road is in heat transfer operating condition, and under the on-off state of on-off valve is the circumstances of disconnection, its corresponding heat transfer branch road is in heat transfer off state.
It should be noted that in the present application, the operation modes of the air conditioner 300 may include a heating mode, a cooling mode and a low-temperature cooling mode, where the heating mode refers to an operation mode in which the compressor presses the refrigerant into the indoor heat exchanger to perform liquefaction heating, and the heating mode is operated to raise the indoor temperature; the cooling mode is an operation mode in which the compressor presses the refrigerant into the outdoor heat exchanger 301 to perform liquefaction and heat release, and the cooling mode is operated to reduce the indoor temperature; the low temperature cooling mode refers to a cooling mode when the outdoor ambient temperature is low, and the cooling mode is operated to lower the indoor temperature in a case where the outdoor ambient temperature is low.
In a specific example, first, the control device 303 is configured to determine whether the air conditioner is in the cooling mode, and if so, control the temperature sensor to obtain the outdoor ambient temperature T4, where the outdoor ambient temperature T4 is a basis for whether the air conditioner 300 is to turn on the low-temperature cooling mode next, and the obtaining of the outdoor ambient temperature T4 may be detected by the temperature sensor disposed outdoors.
Secondly, after obtaining the outdoor environment temperature T4, the control device 303 is further specifically configured to: the magnitude relationship between the outdoor environment temperature T4 and the first preset temperature Tset1 is determined. In one case, if the outdoor ambient temperature T4 is less than or equal to the first preset temperature Tset1 (e.g., 10 ℃), the air conditioner 300 is controlled to operate the low-temperature cooling mode, which is implemented as follows: on the one hand, the rotating speed of the outdoor fan is reduced, and the rotating speed can be reduced to a first preset rotating speed V1, so that the heat exchange capacity of the outdoor heat exchanger 301 is weakened, on the other hand, the control device 303 is also used for controlling the on-off state of the on-off valve to be on, namely, under the condition that the outdoor environment temperature T4 is less than or equal to the first preset temperature Tset1, only the rotating speed of the outdoor fan needs to be reduced, no further control is needed through the on-off valve, the pressure of the refrigerant in the outdoor heat exchanger 301 can be in a reasonable range, and therefore the stable operation of the whole system in the low-temperature refrigeration mode is guaranteed.
Furthermore, when the air conditioner operates in the low-temperature cooling mode, the control device 303 is further specifically configured to: and acquiring the outlet temperature of the outdoor heat exchanger 301, and adjusting the rotating speed of the outdoor fan 302 and the on-off state of the on-off valve according to the outdoor environment temperature and the outlet temperature. Here, the outlet temperature T3 of the outdoor heat exchanger 301 may be detected by a temperature sensor disposed at the outlet of the outdoor heat exchanger 301, and as shown in fig. 1, the outlet temperature T3 may be obtained by disposing a temperature sensor at the main outlet duct 102.
That is, when the air conditioner 300 operates in the low temperature cooling mode, the rotation speed of the outdoor fan 302 and the on-off state of the on-off valve are also adjusted in real time to keep the pressure of the refrigerant in the outdoor heat exchanger 301 within a reasonable range, so that the entire system can maintain a stable operation state, and specifically, the manner and magnitude of the real-time adjustment can be set according to the outdoor ambient temperature T4 and the outlet temperature T3. Compared with the method for adjusting the rotating speed of the outdoor fan 302 and the on-off state of the on-off valve according to the single outdoor environment temperature T4, the outdoor environment temperature T4 and the outlet temperature T3 can comprehensively reflect the actual working temperature of the outdoor heat exchanger 301 more closely, and the actual working temperature of the outdoor heat exchanger 301 directly influences the refrigerant pressure in the outdoor heat exchanger 301 and whether the system can stably run or not, so that the rotating speed of the outdoor fan 302 and the on-off state of the on-off valve can be adjusted according to the outdoor environment temperature and the outlet temperature of the outdoor heat exchanger, the rotating speed of the outdoor fan 302 and the on-off state of the on-off valve can be adjusted more accurately, and the stability of the whole system is better.
In one embodiment, the control device 303 is specifically configured to, when adjusting the rotation speed of the outdoor fan 302 and the on-off state of the on-off valve according to the outdoor environment temperature and the outlet temperature: the method comprises the following steps: if the outdoor environment temperature is greater than the fourth preset temperature and less than or equal to the first preset temperature, and the outlet temperature is less than or equal to the third preset temperature, or the outdoor environment temperature is less than or equal to the first preset temperature, and the outlet temperature is greater than the third preset temperature and less than or equal to the second preset temperature, controlling the outdoor fan 302 to continue to operate at a reduced rotating speed through the control device 303, and controlling the on-off valve to be in a conducting state; if the outdoor environment temperature is less than or equal to the fourth preset temperature and the outlet temperature is less than or equal to the third preset temperature, the rotating speed of the outdoor fan 302 is controlled to be constant through the control device 303, and the on-off state of the on-off valve is controlled to be off. The second preset temperature, the third preset temperature and the fourth preset temperature can be calibrated according to actual conditions, for example, the second preset temperature can be 2 ℃, the third preset temperature can be-10 ℃ and the fourth preset temperature can be-10 ℃.
Specifically, when the air conditioner 300 operates in the low-temperature cooling mode, the control device 303 is specifically configured to: the outdoor environment temperature T4 and the outlet temperature T3 of the outdoor heat exchanger may be obtained at intervals of a preset time (e.g., 2 min), and the outdoor environment temperature T4 and the outlet temperature T3 may be determined according to preset conditions related to the outdoor environment temperature T4 and the outlet temperature T3, so as to adjust the rotation speed of the outdoor fan 302 and the on-off state of the on-off valve according to the determination result. The adjustment can be specifically divided into two adjustment modes: the first adjustment mode is to further control the outdoor fan 302 to operate at a reduced speed by the control device 303, so as to reduce the rotation speed of the outdoor fan to a second preset rotation speed V2, where the second preset rotation speed V2 is lower than the first preset rotation speed V1, and control the on-off valve to be in the on state. The adjustment method corresponds to two implementation conditions, one is that the outdoor environment temperature T4 is greater than the fourth preset temperature Tset4 and less than or equal to the first preset temperature Tset1, and the outlet temperature T3 of the outdoor heat exchanger is less than or equal to the third preset temperature Tset3, and the other is that the outdoor environment temperature T4 is less than or equal to the first preset temperature Tset1, and the outlet temperature T3 is greater than the third preset temperature Tset3 and less than or equal to the second preset temperature Tset2. The second adjustment mode is to control the rotation speed of the outdoor fan 302 to be constant and control the on-off state of the on-off valve to be off, and the implementation conditions of the adjustment mode are that the outdoor environment temperature T4 is less than or equal to the fourth preset temperature Tset4 and the outlet temperature T3 of the outdoor heat exchanger is less than or equal to the third preset temperature Tset3.
In one embodiment, when the on-off valve includes a plurality of on-off valves, the control device 303 is specifically configured to: acquiring a first difference value between a third preset temperature and an outlet temperature, acquiring a second difference value between a fourth preset temperature and an outdoor environment temperature, acquiring the number of the on-off valves in an off state according to the first difference value and the second difference value, and controlling the on-off state of the on-off valves to be off according to the number.
That is, for the air conditioner 300 having a plurality of on-off valves, the control device 303 may control the number of disconnections of the on-off valves in the following manner: in order to maintain the pressure of the refrigerant in the outdoor heat exchanger 301 within a reasonable range when the air conditioner 300 is in the low-temperature cooling mode, the number of on-off valves whose on-off states are off may be determined according to preset conditions regarding the actual operating temperature of the outdoor heat exchanger 301. Specifically, the low temperature degree of the actual working temperature of the outdoor heat exchanger 301 may be represented as a first difference Δ T1 between the third preset temperature Tset3 and the outlet temperature T3, and a second difference Δ T2 between the fourth preset temperature Tset4 and the outdoor ambient temperature T4, so that the first difference Δ T1 and the second difference Δ T2 may be obtained by the control device, the number of the on-off valves with the on-off state being off may be obtained according to the size of the first difference Δ T1 and the second difference Δ T2, and the on-off state of the on-off valves may be controlled by the control device 303 to be off according to the obtained number, so as to change the heat exchange area of the outdoor heat exchanger 301, and further maintain the pressure of the refrigerant of the outdoor heat exchanger 301 in a reasonable range in the low-temperature refrigeration mode, so that the entire system may stably operate.
It is understood that in the present application, the control device 303, when the outdoor ambient temperature T4 increases and/or the outlet temperature T3 increases, is specifically configured to: the air conditioner 300 can be controlled in a manner opposite to the above-mentioned manner, and will not be described in detail here. In addition, when the air conditioner 300 operates in the low-temperature cooling mode, the control device 303 is specifically configured to: if the outdoor ambient temperature T4 is greater than the first preset temperature Tset1, the air conditioner 300 is controlled to exit the low-temperature cooling mode, and the air conditioner 300 is controlled to enter the cooling mode or the air conditioner 300 is controlled to enter the heating mode according to the corresponding preset temperature condition.
In one embodiment, the control device 303 is further configured to control the air conditioner to enter a corresponding cooling mode or heating mode according to a preset condition about the outdoor ambient temperature if the outdoor ambient temperature is greater than the first preset temperature. The first preset temperature is the highest outdoor environment temperature of the low-temperature refrigeration mode, the first preset temperature can be calibrated according to actual conditions, and in a specific example, the first preset temperature can be 10 ℃.
Specifically, the control device 303 is specifically configured to: if the outdoor ambient temperature T4 is higher than the first preset temperature Tset1 (e.g., 10 ℃), which indicates that the low-temperature cooling mode does not need to be operated currently, the air conditioner 300 may be controlled to continue to operate in the cooling mode or the air conditioner 300 may be controlled to operate in the heating mode according to the specific requirements of the user. As in the specific example, the first preset temperature Tset1 is set to 10 ℃, and if the outdoor ambient temperature T4 detected by the temperature sensor is greater than 10 ℃ and less than 20 ℃, the air conditioner 300 may be controlled by the control device 303 to operate in the heating mode; if the outdoor ambient temperature T4 is detected to be greater than 30 c by the temperature sensor, the air conditioner 300 may be controlled to operate in the heating mode by the control device 303.
According to the air conditioner provided by the embodiment of the invention, the outdoor heat exchanger comprises a plurality of heat exchange branches which are connected in parallel, at least one heat exchange branch is provided with an on-off valve which is used for controlling the on-off of the corresponding heat exchange branch, the outdoor fan and the outdoor heat exchanger are correspondingly arranged, the outdoor environment temperature is obtained by the control device when the air conditioner is in a refrigeration mode, the outdoor fan is controlled to reduce the rotating speed to operate when the outdoor environment temperature is less than or equal to a first preset temperature, the on-off state of at least one on-off valve is controlled to be on, so that the air conditioner operates in a low-temperature refrigeration mode, the outlet temperature of the outdoor heat exchanger is obtained when the air conditioner operates in the low-temperature refrigeration mode, the rotating speed of the outdoor fan and the on-off state of the on-off valve are adjusted according to the outdoor environment temperature and the outlet temperature, the pressure of a refrigerant in the outdoor heat exchanger can be maintained in a reasonable range when the outdoor environment temperature is low, the system can be ensured to stably operated, the air conditioner can be suitable for refrigeration in a larger temperature region, the application occasion of the air conditioner under the low-temperature environment, and the reliability of the air conditioner can be optimized under the low-temperature condition of the refrigeration and the refrigeration.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein may be considered as a sequential list of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control method of an air conditioner is characterized in that the air conditioner comprises an outdoor heat exchanger and an outdoor fan arranged corresponding to the outdoor heat exchanger, the outdoor heat exchanger comprises a plurality of heat exchange branches connected in parallel, and an on-off valve is arranged on at least one heat exchange branch and used for controlling the on-off of the corresponding heat exchange branch, and the method comprises the following steps:
when the air conditioner is in a refrigeration mode, acquiring the outdoor environment temperature;
if the outdoor environment temperature is less than or equal to a first preset temperature, controlling the outdoor fan to run at a reduced speed, and controlling the on-off valve to be in a conducting state so as to enable the air conditioner to be in a low-temperature refrigeration mode;
and after the air conditioner is in the low-temperature refrigeration mode, acquiring the outlet temperature of the outdoor heat exchanger, and adjusting the on-off state of the on-off valve and the rotating speed of the outdoor fan according to the outlet temperature and the outdoor environment temperature.
2. The method for controlling an air conditioner according to claim 1, wherein said adjusting the on-off state of said on-off valve and the rotational speed of said outdoor fan according to said outlet temperature and said outdoor ambient temperature comprises:
if the outlet temperature is less than or equal to a second preset temperature and greater than a third preset temperature, and the outdoor environment temperature is less than or equal to the first preset temperature, or the outlet temperature is less than or equal to the third preset temperature, and the outdoor environment temperature is less than or equal to the first preset temperature and greater than a fourth preset temperature, controlling the outdoor fan to continue to run at a reduced speed, and controlling the on-off valve to be in an on state;
and if the outlet temperature is less than or equal to the third preset temperature and the outdoor environment temperature is less than or equal to the fourth preset temperature, controlling the rotating speed of the outdoor fan to be kept unchanged and controlling the on-off valve to be in an off state.
3. The control method of an air conditioner according to claim 2, wherein when the on-off valve includes a plurality, the controlling the on-off valve in an off state includes:
acquiring a first difference value between the outlet temperature and the third preset temperature, and acquiring a second difference value between the outdoor environment temperature and the fourth preset temperature;
acquiring the number of the on-off valves in the off state according to the first difference and the second difference;
and controlling the on-off valve to be in an off state according to the quantity.
4. The control method of an air conditioner according to claim 2, wherein the controlling the outdoor fan to be operated at a reduced speed includes: controlling the rotating speed of the outdoor fan to be reduced to a first preset rotating speed;
the control outdoor fan continues the deceleration operation, include: and controlling the rotating speed of the outdoor fan to be reduced to a second preset rotating speed, wherein the second preset rotating speed is smaller than the first preset rotating speed.
5. The control method of an air conditioner according to any one of claims 1 to 4, further comprising: and if the outdoor environment temperature is higher than the first preset temperature, controlling the air conditioner to enter the cooling mode or the heating mode.
6. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
7. An air conditioner, comprising: an outdoor heat exchanger, an outdoor fan and a control device which are arranged corresponding to the outdoor heat exchanger, wherein,
the outdoor heat exchanger comprises a plurality of heat exchange branches connected in parallel, and an on-off valve is arranged on at least one heat exchange branch and used for controlling the on-off of the corresponding heat exchange branch;
the control device is used for acquiring outdoor environment temperature when the air conditioner is in a refrigeration mode, controlling the outdoor fan to run at a reduced speed when the outdoor environment temperature is less than or equal to a first preset temperature, controlling the on-off valve to be in a conducting state so as to enable the air conditioner to be in a low-temperature refrigeration mode, acquiring outlet temperature of the outdoor heat exchanger after the air conditioner is in the low-temperature refrigeration mode, and adjusting the on-off state of the on-off valve and the rotating speed of the outdoor fan according to the outlet temperature and the outdoor environment temperature.
8. The air conditioner according to claim 7, wherein the control device, when adjusting the on-off state of the on-off valve and the rotation speed of the outdoor fan according to the outlet temperature and the outdoor ambient temperature, is specifically configured to:
if the outlet temperature is less than or equal to a second preset temperature and greater than a third preset temperature, and the outdoor environment temperature is less than or equal to the first preset temperature, or the outlet temperature is less than or equal to the third preset temperature, and the outdoor environment temperature is less than or equal to the first preset temperature and greater than a fourth preset temperature, controlling the outdoor fan to continue to run at a reduced speed, and controlling the on-off valve to be in an on state, wherein the second preset rotating speed is less than the first preset rotating speed;
and if the outlet temperature is less than or equal to the third preset temperature and the outdoor environment temperature is less than or equal to the fourth preset temperature, controlling the rotating speed of the outdoor fan to be kept unchanged and controlling the on-off valve to be in an off state.
9. The air conditioner according to claim 8, wherein when the on-off valve includes a plurality of the on-off valves, the control device is specifically configured to:
obtaining a first difference between the outlet temperature and the third preset temperature, and obtaining a second difference between the outdoor environment temperature and the fourth preset temperature;
acquiring the number of the on-off valves in the off state according to the first difference and the second difference;
and controlling the on-off valve to be in an off state according to the quantity.
10. The air conditioner according to any one of claims 7-9, wherein said control device is further configured to control said air conditioner to enter said cooling mode or said heating mode when said outdoor ambient temperature is greater than said first preset temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042738A (en) * | 2015-06-30 | 2015-11-11 | 广东美的制冷设备有限公司 | Cooling-heating type air conditioning system and cooling air conditioning system |
| CN108151254A (en) * | 2017-12-25 | 2018-06-12 | 广东美的制冷设备有限公司 | Air conditioner, progress control method and computer readable storage medium |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042738A (en) * | 2015-06-30 | 2015-11-11 | 广东美的制冷设备有限公司 | Cooling-heating type air conditioning system and cooling air conditioning system |
| CN108151254A (en) * | 2017-12-25 | 2018-06-12 | 广东美的制冷设备有限公司 | Air conditioner, progress control method and computer readable storage medium |
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