Air conditioner and control method of air conditioner

Abstract

The invention discloses an air conditioner and a control method for the air conditioner. The air conditioner comprises a casing, a refrigerant circulation loop, a refrigeration system, an electronic expansion valve, an indoor coil temperature sensor and a controller. The controller is configured to: query an electronic expansion valve opening database according to acquired acquisition parameters and electronic expansion valve opening partition conditions, and control the opening of the electronic expansion valve to be a first opening; determine that the time for the electronic expansion valve to maintain the first opening reaches a first preset time threshold and the acquisition parameters remain unchanged, and record the first indoor coil temperature; adjust the opening of the electronic expansion valve according to a read adjustment direction mark; determine that the time for the electronic expansion valve to maintain a second opening reaches a second preset time threshold and the acquisition parameters remain unchanged, and record the second indoor coil temperature; update the electronic expansion valve opening database or reassign the adjustment direction mark according to the first indoor coil temperature and the second indoor coil temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner and a control method thereof. Background Art

[0002] The electronic expansion valve is the main throttling component in the air-conditioning system, especially the variable frequency air-conditioning. In the air-conditioning system, the throttling and flow of the refrigerant in the refrigeration system are adjusted by controlling the opening of the electronic expansion valve, so that the refrigerant system can achieve the best cooling and heating energy efficiency and ensure the stability and reliability of the refrigerant system operation.

[0003] The mainstream scheme for controlling the electronic expansion valve of the existing air conditioner includes controlling the opening of the electronic expansion valve according to the target exhaust or suction superheat. However, although the method of controlling the opening of the electronic expansion valve by using the target exhaust or suction superheat control method is simple and reliable, the optimal target superheat is only valid for an air conditioner under a fixed condition. When the conditions of the air conditioner change, such as changes in the system refrigerant, dust accumulation in the heat exchanger causing the heat exchange performance to decay, and the lengthening of the connecting pipe between the internal and external units, the optimal target superheat also changes accordingly. In addition, the exhaust or suction superheat is the difference between the parameters of two temperature points (exhaust temperature-condenser coil temperature, suction temperature-evaporator coil). When the changes in the two parameters are the same, the superheat remains unchanged, that is, the same superheat can correspond to multiple electronic expansion valve openings, and the refrigeration performance is different under different electronic expansion valve openings. Therefore, by adopting this control method, the obtained electronic expansion valve opening is usually not the opening of the optimal state of refrigeration performance, and it cannot be guaranteed that the air conditioner always operates at the optimal performance. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide an air conditioner, which can automatically adjust and compare, determine the electronic expansion valve opening with the best refrigeration performance of the refrigeration system based on the preset electronic expansion valve opening zoning conditions and the electronic expansion valve opening database, and automatically update the opening corresponding to the database to the new opening with the best refrigeration performance, so that the electronic expansion valve opening in the database is controlled within the opening range corresponding to the best refrigeration performance. In addition, during the operation of the air conditioner, the opening of the electronic expansion valve is updated in real time. When the air conditioner or the working environment changes, the opening of the electronic expansion valve is adjusted by copper and the indoor coil temperature is compared to determine the optimal opening of the electronic expansion valve and update the electronic expansion valve opening database in time to ensure that the air conditioner can perform at its best under various conditions.

[0005] Therefore, two objects of the present invention are to provide a control method for an air conditioner.

[0006] To achieve the above-mentioned purpose, the present invention proposes an air conditioner, comprising: a casing; a refrigerant circulation loop, which is arranged in the casing, so that the refrigerant circulates in a loop composed of a compressor, a condenser, an expansion valve, an evaporator, a four-way valve and a pressure reducer; a refrigeration system, which is arranged in the casing, and performs heat exchange between the refrigerant and the indoor air in the compression refrigeration cycle of the refrigerant circulation loop, and the refrigeration system includes the compressor, which is used to compress the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharge it to the condenser; an electronic expansion valve, which is arranged between the condenser and the evaporator, and the electronic expansion valve is used to increase the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is reduced, and reduce the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is increased; an indoor coil temperature sensor, which is arranged in the casing and used to detect the indoor coil temperature; the controller is configured to: obtain The air conditioner collects parameters, queries the electronic expansion valve opening database according to the collected parameters and the electronic expansion valve opening partition conditions, obtains the first opening information and controls the opening of the electronic expansion valve to the first opening; determines that the time when the electronic expansion valve maintains the first opening exceeds the preset adjustment period and the collected parameters remain unchanged, determines that the time when the electronic expansion valve maintains the first opening reaches the first preset time threshold, and records the first indoor coil temperature; reads the adjustment direction flag, and adjusts the opening of the electronic expansion valve according to the adjustment direction flag; determines that the time when the electronic expansion valve maintains the second opening exceeds the preset adjustment period and the collected parameters remain unchanged, determines that the time when the electronic expansion valve maintains the second opening reaches the second preset time threshold, and records the second indoor coil temperature; updates the electronic expansion valve opening database or reassigns the adjustment direction flag according to the first indoor coil temperature and the second indoor coil temperature.

[0007] According to the air conditioner of the embodiment of the present invention, after the air conditioner is working stably, the electronic expansion valve opening database is queried according to the collected parameters and based on the electronic expansion valve opening partition conditions to read the corresponding optimal electronic expansion valve opening, and during the operation of the air conditioner, the electronic expansion valve opening size is intelligently adjusted, and the opening of the electronic expansion valve under the condition of better working performance of the air conditioner is obtained by comparing the changes in the indoor coil temperature before and after the adjustment of the electronic expansion valve opening, and the corresponding opening in the electronic expansion valve opening database is updated to the optimal opening in time, or the direction of subsequent adjustment of the opening of the electronic expansion valve is changed to ensure that the opening of the electronic expansion valve always maintains the optimal opening, so that the air conditioner can perform at its best under various conditions.

[0008] In some embodiments, the air conditioner also includes: an indoor fan; an indoor ambient temperature sensor, which is arranged in the casing and is used to detect the indoor ambient temperature value; obtaining acquisition parameters of the air conditioner, querying the electronic expansion valve opening database according to the acquisition parameters and the electronic expansion valve opening partition conditions, obtaining first opening information and controlling the opening of the electronic expansion valve to be the first opening, the controller is specifically configured to: obtain the operating frequency of the compressor, the indoor ambient temperature value and the indoor fan speed, query the electronic expansion valve opening database according to the operating frequency of the compressor, the indoor ambient temperature value and the indoor fan speed to obtain the first opening information; according to the first opening information, adjust the electronic expansion valve from the initial opening to the first opening.

[0009] In some embodiments, when the adjustment direction flag is read and the opening of the electronic expansion valve is adjusted according to the adjustment direction flag, the controller is specifically configured to: determine that the adjustment direction flag is a first adjustment direction flag, and control the opening of the electronic expansion valve to increase a preset opening threshold; or determine that the adjustment direction flag is a second adjustment direction flag, and control the opening of the electronic expansion valve to decrease the preset opening threshold;

[0010] In some embodiments, when the electronic expansion valve opening database is updated or the adjustment direction flag is reassigned according to the first indoor coil temperature and the second indoor coil temperature, the controller is specifically configured as follows: in cooling mode, determine that the first indoor coil temperature is less than the second indoor coil temperature, and update the corresponding opening in the electronic expansion valve opening database to the current opening according to the electronic expansion valve opening partition condition; or, in the cooling mode, determine that the first indoor coil temperature is greater than or equal to the second indoor coil temperature, and reassign the adjustment direction flag.

[0011] In some embodiments, when reassigning the adjustment direction flag, the controller is specifically configured to: determine that the adjustment direction flag is the first adjustment direction flag, and reassign the adjustment direction flag to the second adjustment direction flag; or, determine that the adjustment direction flag is the second adjustment direction flag, and reassign the adjustment direction flag to the first adjustment direction flag.

[0012] In some embodiments, the controller is specifically configured to: determine that the time for the electronic expansion valve to maintain the first opening does not exceed the preset adjustment period, control the opening of the electronic expansion valve to maintain the first opening, or, determine that the time for the electronic expansion valve to maintain the first opening exceeds the preset adjustment period and the acquisition parameter changes, re-query the electronic expansion valve opening database according to the electronic expansion valve opening partition condition, obtain third opening information and control the opening of the electronic expansion valve to be the third opening; and, determine that the time for the electronic expansion valve to maintain the second opening does not exceed the preset adjustment period, control the opening of the electronic expansion valve to maintain the second opening, or, determine that the time for the electronic expansion valve to maintain the second opening exceeds the preset adjustment period and the acquisition parameter changes, re-query the electronic expansion valve opening database according to the electronic expansion valve opening partition condition, obtain fourth opening information and control the opening of the electronic expansion valve to be the fourth opening; wherein the third opening information and the fourth opening information are the first opening information re-acquired, and the third opening and the fourth opening are the readjusted first opening.

[0013] In some embodiments, the first preset time threshold ≥ the preset adjustment period, and the second preset time threshold ≥ the preset adjustment period.

[0014] In some embodiments, before obtaining the first opening information and adjusting the opening of the electronic expansion valve to the first opening, the controller is specifically configured to: before starting up, obtain setting parameter information and environmental parameter information, query the electronic expansion valve opening database according to the setting parameter information and the environmental parameter information, obtain initial opening information, and control the opening of the electronic expansion valve to maintain the initial opening according to the initial opening information; after the compressor starts running, determine that the time for the electronic expansion valve to maintain the initial opening reaches an initial preset time threshold.

[0015] In some embodiments, the air conditioner also includes: an outdoor ambient temperature sensor, which is arranged in the casing and is used to detect the outdoor ambient temperature value; an outdoor fan; before starting up, obtaining setting parameter information and environmental parameter information, querying the electronic expansion valve opening database according to the setting parameter information and the environmental parameter information, obtaining initial opening information, and controlling the opening of the electronic expansion valve to remain at the initial opening according to the initial opening information. The controller is specifically configured to: determine that the air conditioner is about to start up, obtain the target operating frequency of the compressor, the indoor ambient temperature value, the outdoor ambient temperature value, the indoor fan gear and the outdoor fan gear, query the electronic expansion valve opening database according to the target operating frequency of the compressor, the indoor ambient temperature value, the outdoor ambient temperature value, the indoor fan gear and the outdoor fan gear, obtain the initial opening information, and control the opening of the electronic expansion valve to maintain the initial opening.

[0016] To achieve the above-mentioned purpose, an embodiment of the present invention provides a control method for an air conditioner, the control method for an air conditioner is used for an air conditioner as described in any one of the above items, the method comprising the following steps: obtaining acquisition parameters of the air conditioner, querying an electronic expansion valve opening database according to the acquisition parameters and electronic expansion valve opening partition conditions, obtaining first opening information and controlling the opening of the electronic expansion valve to be the first opening; determining that the time for the electronic expansion valve to maintain the first opening exceeds a preset adjustment period and the acquisition parameters remain unchanged, determining that the time for the electronic expansion valve to maintain the first opening reaches a first preset time threshold, and recording a first indoor coil temperature; reading an adjustment direction flag, and adjusting the opening of the electronic expansion valve according to the adjustment direction flag; determining that the time for the electronic expansion valve to maintain the second opening exceeds a preset adjustment period and the acquisition parameters remain unchanged, determining that the time for the electronic expansion valve to maintain the second opening reaches a second preset time threshold, and recording a second indoor coil temperature; updating the electronic expansion valve opening database or reassigning the adjustment direction flag according to the first indoor coil temperature and the second indoor coil temperature.

[0017] According to the control method of the air conditioner of the embodiment of the present invention, after the air conditioner is working stably, the electronic expansion valve opening database is queried according to the collected parameters and based on the electronic expansion valve opening partition conditions to read the corresponding optimal electronic expansion valve opening, and during the operation of the air conditioner, the electronic expansion valve opening size is intelligently adjusted, and the opening of the electronic expansion valve under the condition of better working performance of the air conditioner is obtained by comparing the changes in the indoor coil temperature before and after the adjustment of the electronic expansion valve opening, and the corresponding opening in the electronic expansion valve opening database is updated to the optimal opening in time, or the direction of subsequent adjustment of the opening of the electronic expansion valve is changed to ensure that the opening of the electronic expansion valve always maintains the optimal opening, so that the air conditioner can perform at its best under various conditions.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a block diagram of an air conditioner according to an embodiment of the present invention;

[0021] Figure 2 is a block diagram of an air conditioner according to another embodiment of the present invention;

[0022] Figure 3 is a block diagram of an air conditioner according to yet another embodiment of the present invention;

[0023] Figure 4 is a flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0024] Figure 5 FIG. 4 is a flow chart of a method for controlling an air conditioner according to another embodiment of the present invention.

[0025] Reference numerals:

[0026] Air conditioner 100;

[0027] Casing 1, refrigerant circulation loop 2, refrigeration system 3, electronic expansion valve 4, indoor coil temperature sensor 5, controller 6, indoor fan 7, indoor ambient temperature sensor 8, outdoor ambient temperature sensor 9, outdoor fan 10. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation",

[0033] The terms “connected” and “connection” should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or connected through an intermediate medium.

[0034] The indirect connection may be the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

[0035] The air conditioner of the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0036] The compressor compresses the refrigerant gas at high temperature and high pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into liquid phase, and the heat is released through the condensation process.

[0037] Release into the surrounding environment.

[0038] The electronic expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the refrigerant gas at a low temperature and low pressure to the evaporator.

[0039] Back to the compressor. The evaporator can achieve the refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the air conditioner can adjust the temperature of the indoor space.

[0040] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0041] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser,

[0042] The air conditioner functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0043] The prior art obtains the suction superheat and exhaust superheat, and controls the opening of the electronic expansion valve according to the suction superheat and exhaust superheat. The controller sets multiple target exhaust or suction superheat values ​​according to the operating conditions or calculates the corresponding target exhaust or suction superheat values ​​according to a preset calculation formula. The air conditioning controller collects the refrigeration system

[0044] The controller determines whether the electronic expansion valve opening is increased or decreased and the change step by comparing the actual exhaust or suction superheat with the target exhaust or suction superheat.

[0045] Long, adjust the opening of the electronic expansion valve to make the actual exhaust or suction heat close to the target exhaust or suction superheat. If the actual exhaust or suction superheat is equal to the target exhaust or suction superheat, or the difference between the actual exhaust or suction superheat and the target exhaust or suction superheat is within the tolerance range, the opening of the electronic expansion valve remains unchanged.

[0046] When the electronic expansion valve is opened, the obtained electronic expansion valve opening is usually not the opening of the optimal state of refrigeration performance, and it is impossible to ensure that the air conditioner always operates at the optimal performance. Based on this, the present invention proposes an air conditioner and a control method thereof.

[0047] The control of the sub-expansion valve adopts database technology and artificial intelligence AI technology. The electronic expansion valve opening database is preset in the air-conditioning controller. According to the combination of compressor operating frequency, indoor ambient temperature, outdoor ambient temperature, indoor unit fan gear, and outdoor unit fan gear, an optimal electronic expansion valve opening corresponds to the electronic expansion valve opening, and the electronic expansion valve opening database is cyclically compared and updated to make the air conditioner operate at the electronic expansion valve opening with the best cooling performance. Figure 1-Figure 5 An air conditioner and a control method thereof according to an embodiment of the present invention are described.

[0048] Figure 1 is a block diagram of an air conditioner according to an embodiment of the present invention, wherein the air conditioner 100 includes a casing 1, a refrigerant circulation loop 2, a refrigeration system 3, an electronic expansion valve 4, an indoor coil temperature sensor 5 and a controller 6.

[0049] Among them, the refrigerant circulation loop 2 is arranged in the casing, so that the refrigerant circulates in the loop composed of the compressor, condenser, expansion valve, evaporator, four-way valve and pressure reducer; the refrigeration system 3 is arranged in the casing 1, and performs heat exchange between the refrigerant and the indoor air in the compression refrigeration cycle of the refrigerant circulation loop. The refrigeration system 3 includes a compressor, which is used to compress the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharge it to the condenser; the electronic expansion valve 4 is arranged between the condenser and the evaporator, and the electronic expansion valve 4 is used to increase the flow resistance of the refrigerant passing through the electronic expansion valve 4 when its opening is reduced, and reduce the flow resistance of the refrigerant passing through the electronic expansion valve 4 when its opening is increased; the indoor coil temperature sensor 5 is arranged in the casing 1, and is used to detect the indoor coil temperature.

[0050] The controller 6 is configured to obtain acquisition parameters of the air conditioner 100, query the electronic expansion valve opening database according to the acquisition parameters and the electronic expansion valve opening partition conditions, obtain first opening information and control the opening of the electronic expansion valve to the first opening.

[0051] Among them, the electronic expansion valve opening database is a database established based on the operating frequency of the compressor, indoor ambient temperature, outdoor ambient temperature, indoor unit fan gear, outdoor unit fan gear, indoor fan speed, etc. After calculation and design, when the air conditioner 100 operates with different parameters under different environmental conditions, the corresponding electronic expansion valve opening is not exactly the same. The electronic expansion valve database can be stored in the storage unit of the air conditioner in advance when leaving the factory.

[0052] The acquisition parameters of the air conditioner 100 should be obtained after the compressor has been running normally for a period of time. Under this condition, the air conditioning system has become stable. It is understandable that when the air conditioner 100 is running stably, if the air conditioner always runs in the same mode according to the set gear, as the running time increases, the actual operating parameters such as the operating frequency of the compressor and the fan speed may change, and the collected indoor ambient temperature will change, but the change in the outdoor ambient temperature is small and can be ignored. Therefore, the electronic expansion valve opening zoning conditions can be established based on the compressor operating frequency, indoor ambient temperature and indoor fan speed.

[0053] Since the adjustment of the opening of the electronic expansion valve is made when the air-conditioning system is in a steady-state condition, it takes a certain amount of time for the air conditioner to be turned on and run stably. During this period, the temperature of the air-conditioning system changes greatly. The process is non-steady-state, and in the non-steady state, the electronic expansion valve needs to be controlled to maintain a certain opening. Therefore, the opening of the electronic expansion valve in the non-steady-state process is the initial opening. Therefore, the initial opening under non-steady-state conditions is not used, and a more accurate opening of the electronic expansion valve needs to be obtained.

[0054] Therefore, if Figure 2 As shown, it is a block diagram of an air conditioner according to another embodiment of the present invention, wherein the air conditioner 100 further includes an indoor fan 7 and an indoor ambient temperature sensor 8. The indoor ambient temperature sensor 8 is arranged in the housing 1, and is used to detect the indoor ambient temperature value; when acquiring the acquisition parameters of the air conditioner 100, querying the electronic expansion valve opening database according to the acquisition parameters and the electronic expansion valve opening partition conditions, acquiring the first opening information and controlling the opening of the electronic expansion valve 4 to be the first opening, the controller is specifically configured to: acquire the operating frequency of the compressor, the indoor ambient temperature value and the indoor fan speed, query the electronic expansion valve opening database according to the operating frequency of the compressor, the indoor ambient temperature value and the indoor fan speed, and based on the electronic expansion valve opening partition conditions, the opening information of the electronic expansion valve adapted to the current environmental conditions, that is, the first opening information, can be obtained. And, according to the artificial intelligence AI technology, according to the first opening information, the opening of the electronic expansion valve 4 can be intelligently adjusted to the first opening.

[0055] In an embodiment, it is determined that the time the electronic expansion valve maintains the first opening exceeds a preset adjustment period and the acquisition parameters remain unchanged, it is determined that the time the electronic expansion valve maintains the first opening reaches a first preset time threshold, and the first indoor coil temperature is recorded.

[0056] It is understandable that, due to the condition that the air conditioner 100 needs to operate stably and the limited control resources, the opening of the electronic expansion valve 4 is not adjusted in real time, and a certain adjustment period needs to be set, wherein a preset adjustment period can be set as needed, for example, the preset adjustment period can be set to 45s or 60s or 75s or 90s, etc., which is not specifically limited here. Preferably, the preset adjustment period can be set to 60s. In the preset adjustment period after the opening of the electronic expansion valve 4 is adjusted to the first opening, even if the acquisition parameters of the air conditioner 10 change, it is necessary to wait until the time for the electronic expansion valve 4 to maintain the current opening reaches the adjustment period before adjusting it again.

[0057] If the time for which the electronic expansion valve 4 maintains the first opening reaches a preset adjustment period, the operating parameters of the air conditioner 100, such as the operating frequency of the compressor and the fan speed, have not changed, and the collected indoor ambient temperature has not changed, or it is detected that the range of change of the current collected parameters of the air conditioner 100 does not exceed the set range, there is no need to adjust the opening of the electronic expansion valve 4 again for the time being.

[0058] In addition, if the acquisition parameters do not change for a long time, when the time that the electronic expansion valve 4 maintains the first opening reaches the first preset time threshold, it is also necessary to appropriately adjust the opening of the electronic expansion valve 4. Among them, the first preset time threshold can be set as needed. Considering that the collected indoor ambient temperature and other information has the characteristics of hysteresis, the first preset time threshold can be set ≥ the preset adjustment period. For example, the first preset time threshold can be set to 60s or 120s or 150s or 180s, etc., which is not specifically limited here. Preferably, the first preset time threshold can be set to 180s. When it is determined that the time that the electronic expansion valve 4 maintains the first opening reaches the first preset time threshold, the first indoor coil temperature is read and recorded.

[0059] In the embodiment, the adjustment direction flag is read, and the opening degree of the electronic expansion valve is adjusted according to the adjustment direction flag.

[0060] When the opening of the electronic expansion valve 4 is adjusted for the first time according to the adjustment direction mark, the adjustment direction mark is a set default value, and the adjustment direction mark may include a first adjustment direction mark and a second adjustment direction mark. For example, the first adjustment direction mark may be assigned a value of 0, and the second adjustment direction mark may be assigned a value of 1, and the electronic expansion valve 4 may be adjusted in a direction of increasing the opening, or in a direction of decreasing the opening, according to different adjustment direction marks.

[0061] Specifically, when the adjustment direction flag is read and the opening of the electronic expansion valve 4 is adjusted according to the adjustment direction flag, the controller is specifically configured to: determine that the adjustment direction flag is the first adjustment direction flag, and control the opening of the electronic expansion valve 4 to increase the preset opening threshold. Alternatively, determine that the adjustment direction flag is the second adjustment direction flag, and control the opening of the electronic expansion valve to decrease the preset opening threshold. Among them, the preset opening threshold can be set as needed. For example, the preset opening threshold can be set to 1 step, 2 steps, or 3 steps, etc., which is not specifically limited here. Preferably, the preset opening threshold can be set to 1 step. That is to say, when the adjustment direction flag is read as 0, the opening of the electronic expansion valve 4 is controlled to increase by one step, and when the adjustment direction flag is read as 1, the opening of the electronic expansion valve 4 is controlled to decrease by one step.

[0062] In the embodiment, it is determined that the time the electronic expansion valve 4 maintains the second opening exceeds a preset adjustment period and the acquisition parameters remain unchanged, and it is determined that the time the electronic expansion valve 4 maintains the second opening reaches a second preset time threshold, and the second indoor coil temperature is recorded.

[0063] After the opening of the electronic expansion valve 4 is adjusted to the second opening, if the time for which the electronic expansion valve 4 maintains the second opening reaches a preset adjustment period, the operating parameters of the air conditioner 100 such as the operating frequency of the compressor and the fan speed have not changed, and the collected indoor ambient temperature has not changed, or it is detected that the change range of the current collected parameters of the air conditioner 100 does not exceed the set range, and therefore there is no need to adjust the opening of the electronic expansion valve 4 again for the time being.

[0064] If the acquisition parameters do not change for a long time, when the time for which the electronic expansion valve 4 maintains the second opening reaches the second preset time threshold, it is also necessary to appropriately adjust the opening of the electronic expansion valve 4. Among them, the second preset time threshold can be set as needed. Considering that the collected indoor ambient temperature and other information has the characteristics of hysteresis, the second preset time threshold can be set ≥ the preset adjustment period. For example, the second preset time threshold can be set to 60s or 120s or 150s or 180s, etc., which is not specifically limited here. Preferably, the second preset time threshold can be set to 180s. When it is determined that the time for which the electronic expansion valve 4 maintains the second opening reaches the second preset time threshold, the second indoor coil temperature is read and recorded.

[0065] In an embodiment, the electronic expansion valve opening database is updated or the adjustment direction flag is reassigned according to the first indoor coil temperature and the second indoor coil temperature.

[0066] It is understandable that after adjusting the electronic expansion valve 4, the indoor coil temperature will inevitably change. For example, when the air conditioner 100 is running in cooling mode, if the indoor coil temperature after adjustment is lower than the indoor coil temperature before adjustment, it is considered that the air conditioner has better cooling performance after adjustment, and the opening of the electronic expansion valve after adjustment, that is, the second opening, is more suitable for the current operating state than the first opening. Alternatively, if the indoor coil temperature after adjustment is higher than the indoor coil temperature before adjustment, it is considered that the cooling performance of the air conditioner after adjustment has deteriorated, and the opening of the electronic expansion valve before adjustment, that is, the first opening, is more suitable for the current operating state than the second opening.

[0067] Based on this, when updating the electronic expansion valve opening database or reassigning the adjustment direction flag according to the first indoor coil temperature and the second indoor coil temperature, the controller 5 is specifically configured as follows: in the cooling mode, it is determined that the first indoor coil temperature is less than the second indoor coil temperature, and according to the electronic expansion valve opening partition condition, the corresponding opening in the electronic expansion valve opening database is updated to the current opening. By updating the electronic expansion valve opening database, the corresponding opening in the electronic expansion valve opening database is replaced with the current electronic expansion valve opening. The next time the opening of the electronic expansion valve 4 is obtained, if the acquisition parameters are the same as the current acquisition parameters, a more optimal and accurate opening of the electronic expansion valve 4 can be obtained, so that the air conditioner can perform at its best performance.

[0068] Alternatively, in the cooling mode, determine that the first indoor coil temperature is greater than or equal to the second indoor coil temperature, and reassign the adjustment direction flag. It can be understood that in the cooling mode, the lower the evaporator temperature, the stronger the cooling capacity of the air conditioner 10. If after adjusting the opening of the single electronic expansion valve 4, the refrigeration performance of the air conditioner 100 becomes worse, that is, the opening of the electronic expansion valve before the adjustment, that is, the first opening, is more suitable for the current operating state than the second opening, then there is no need to update the electronic expansion valve opening database. Also, in order to avoid the situation where the refrigeration performance of the air conditioner deteriorates after the current adjustment in the next adjustment, the adjustment direction flag can be reassigned. For example, if the adjustment direction mark obtained this time is the first adjustment direction mark, it is believed that when performing intelligent adjustment, controlling the opening of the electronic expansion valve 4 to increase the preset opening threshold is not the best adjustment method. Then, another adjustment method can be tried, and the direction mark is readjusted to the second adjustment direction mark. During the next adjustment, the opening of the electronic expansion valve 4 is controlled to decrease the preset opening threshold. The optimal opening is obtained by comparison and the electronic expansion valve opening database is updated, so that the air conditioner 100 can perform at its best under various conditions.

[0069] According to the air conditioner 100 of the embodiment of the present invention, after the air conditioner is working stably, the electronic expansion valve opening database is queried according to the collected parameters and based on the electronic expansion valve opening partition conditions to read the corresponding optimal opening of the electronic expansion valve 4, and during the operation of the air conditioner, the opening size of the electronic expansion valve 4 is intelligently adjusted, and the opening of the electronic expansion valve 4 is obtained when the air conditioner 10 works better by comparing the changes in the indoor coil temperature before and after the adjustment of the electronic expansion valve opening 4, and the corresponding opening in the electronic expansion valve opening database is updated to the optimal opening in time, or the direction of the subsequent adjustment of the opening of the electronic expansion valve 4 is changed to ensure that the opening of the electronic expansion valve 4 always maintains the optimal opening, so that the air conditioner 10 can perform at its best under various conditions.

[0070] In some embodiments, the controller 6 is specifically configured to: determine that the time for which the electronic expansion valve 4 maintains the first opening does not exceed the preset adjustment period, control the opening of the electronic expansion valve 4 to maintain the first opening, or, determine that the time for which the electronic expansion valve 4 maintains the first opening exceeds the preset adjustment period and the acquisition parameters change, re-query the electronic expansion valve opening database according to the electronic expansion valve opening partitioning conditions, obtain the third opening information and control the opening of the electronic expansion valve to the third opening; and, determine that the time for the electronic expansion valve to maintain the second opening does not exceed the preset adjustment period, control the opening of the electronic expansion valve to maintain the second opening, or, determine that the time for the electronic expansion valve to maintain the second opening exceeds the preset adjustment period and the acquisition parameters change, re-query the electronic expansion valve opening database according to the electronic expansion valve opening partitioning conditions, obtain the fourth opening information and control the opening of the electronic expansion valve to the fourth opening.

[0071] It is understandable that after performing the operation of adjusting the opening of the electronic expansion valve 4 once, within the preset adjustment cycle, even if the acquisition parameters of the air conditioner 100 change, it is necessary to wait until the time for the electronic expansion valve 4 to maintain the current opening reaches the adjustment cycle before adjusting it again. If the time for the electronic expansion valve 4 to maintain the first opening or the second opening reaches the preset adjustment cycle, the operating parameters such as the operating frequency or the fan speed of the compressor of the air conditioner 100 change, or the indoor ambient temperature collected also changes, or it is detected that the current range of changes in the acquisition parameters of the air conditioner 100 exceeds the set range. Since the acquisition parameters have changed, continuing to control the electronic expansion valve 4 to maintain the current opening can no longer meet the requirements of the air conditioner 100 to exert the best performance. At this time, it is necessary to query the electronic expansion valve opening database again according to the electronic expansion valve opening partition conditions to obtain more appropriate opening information, and adjust the opening of the electronic expansion valve 4 according to the opening information.

[0072] The third opening information and the fourth opening information are equivalent to the first opening information obtained again, and the third opening and the fourth opening are equivalent to the first opening after readjustment. It can be seen that the adjustment of the opening of the electronic expansion valve 4 is actually a cyclic process, the purpose of which is to make the air conditioner operate at the opening of the electronic expansion valve 4 with the best refrigeration performance, and to ensure that the air conditioner 100 can perform at the best performance under various conditions.

[0073] In some embodiments, before obtaining the first opening information and adjusting the opening of the electronic expansion valve 4 to the first opening, the controller is specifically configured as follows: before starting the operation, obtaining the setting parameter information and the environmental parameter information, querying the electronic expansion valve opening database according to the setting parameter information and the environmental parameter information, obtaining the initial opening information, and controlling the opening of the electronic expansion valve to maintain the initial opening.

[0074] Among them, based on the above content, it can be known that the operating state of the air conditioner 100 is unstable for a period of time after it is just turned on. However, before the air conditioner 100 starts to run, it is necessary to determine the initial opening of the electronic expansion valve 4. When the air conditioner 100 is started, the electronic expansion valve 4 is controlled to open to the initial opening to ensure that the air conditioner 100 can start normally. The initial opening should be an opening that is compatible with the current environmental parameters and the set parameters of the air conditioner 100. However, since the air conditioner 100 has not officially started to run at this time, the actual operating frequency of the compressor and the fan speed cannot be directly collected. Only a series of set parameter information and environmental parameter information can be obtained, and the electronic expansion valve opening database is queried according to the set parameter information and environmental parameter information to obtain the initial opening information, and then the opening of the electronic expansion valve is controlled according to the initial opening information to maintain the initial opening.

[0075] The setting parameter information may include the target operating frequency of the compressor, the indoor fan gear and the outdoor fan gear, and the environmental parameter information may include the indoor ambient temperature value and the outdoor ambient temperature value, etc.

[0076] Therefore, if Figure 3 , which is a block diagram of an air conditioner according to another embodiment of the present invention, the air conditioner 100 further includes an outdoor ambient temperature sensor 9 and an outdoor fan 10. The outdoor ambient temperature sensor is disposed in the casing to detect the outdoor ambient temperature value.

[0077] Before starting the operation, the setting parameter information is obtained and the electronic expansion valve opening database is queried according to the setting parameter information to obtain the initial opening information, and the opening of the electronic expansion valve is controlled to maintain the initial opening. The controller is specifically configured as follows: determining that the air conditioner is about to start running, obtaining the target operating frequency of the compressor, the indoor ambient temperature value, the outdoor ambient temperature value, the indoor fan gear and the outdoor fan gear, querying the electronic expansion valve opening database according to the target operating frequency of the compressor, the indoor ambient temperature value, the outdoor ambient temperature value, the indoor fan gear and the outdoor fan gear, obtaining the initial opening information, and controlling the opening of the electronic expansion valve to maintain the initial opening.

[0078] And, after the compressor starts running, it is determined that the time for the electronic expansion valve 4 to maintain the initial opening reaches the initial preset time threshold. Among them, the preset time threshold can be set as needed, for example, the preset time threshold can be set to 5min or 10min, etc., which is not specifically limited here. Preferably, the preset adjustment period can be set to 10mins. During the period of the preset time threshold, the temperature of the air conditioning system of the air conditioner 100 changes greatly and is unstable. At this time, the electronic expansion valve 4 is controlled to maintain the initial opening in order to adjust the air conditioner 100 to a stable operating state as soon as possible. And when the air conditioner 100 is running stably, the operating frequency of its compressor may be inconsistent with the target frequency, and the fan speed under different fan gears in different modes is also different, and the indoor ambient temperature may change. If the electronic expansion valve 4 is always controlled to maintain the initial opening, the requirement for the air conditioner 100 to exert the best performance cannot be met. It is necessary to query the electronic expansion valve opening database again according to the electronic expansion valve opening partition condition, obtain more suitable opening information, that is, the first opening information, and intelligently adjust the opening of the electronic expansion valve 4 to the first opening.

[0079] In some embodiments of the present invention, a control method for an air conditioner is also provided, which is used for the air conditioner 100 as described above. Figure 4 FIG. 2 is a flow chart of a method for controlling an air conditioner according to an embodiment of the present invention, wherein the method includes steps S1 to S5, which are specifically as follows.

[0080] S1, acquiring acquisition parameters of the air conditioner, querying the electronic expansion valve opening database according to the acquisition parameters and the electronic expansion valve opening partition conditions, acquiring first opening information and controlling the opening of the electronic expansion valve to be the first opening.

[0081] Among them, the collected parameters include the compressor operating frequency, indoor ambient temperature and indoor fan speed, and the electronic expansion valve opening partition conditions can be established based on the compressor operating frequency, indoor ambient temperature and indoor fan speed. The operating frequency of the compressor, the indoor ambient temperature value and the indoor fan speed are obtained, and the electronic expansion valve opening database is queried based on the compressor operating frequency, indoor ambient temperature value and indoor fan speed, based on the electronic expansion valve opening partition conditions, to obtain the opening information of the electronic expansion valve that is suitable for the current environmental conditions, that is, the first opening information. And, according to artificial intelligence AI technology, according to the first opening information, the opening of the electronic expansion valve can be intelligently adjusted to the first opening.

[0082] S2, determining that the time for which the electronic expansion valve maintains the first opening exceeds a preset adjustment period and the acquisition parameters remain unchanged, determining that the time for which the electronic expansion valve maintains the first opening reaches a first preset time threshold, and recording the first indoor coil temperature.

[0083] If the time for the electronic expansion valve to maintain the first opening reaches the preset adjustment period, the operating parameters of the air conditioner such as the operating frequency of the compressor and the fan speed have not changed, and the collected indoor ambient temperature has not changed, or it is detected that the change range of the current air conditioner collection parameters does not exceed the set range, it is temporarily unnecessary to adjust the opening of the electronic expansion valve again. Among them, the first preset time threshold can be set as needed, and considering that the collected indoor ambient temperature and other information has the characteristics of hysteresis, the first preset time threshold can be set ≥ the preset adjustment period.

[0084] S3, reading the adjustment direction mark, and adjusting the opening of the electronic expansion valve according to the adjustment direction mark.

[0085] Wherein, when it is determined that the adjustment direction mark is the first adjustment direction mark, the opening of the electronic expansion valve is controlled to increase by a preset opening threshold. Alternatively, when the adjustment direction mark is determined to be the second adjustment direction mark, the opening of the electronic expansion valve is controlled to decrease by a preset opening threshold. Specifically, the preset opening threshold can be set as needed. For example, the preset opening threshold can be set to 1 step, 2 steps, or 3 steps, etc., which is not specifically limited here. Preferably, the preset opening threshold can be set to 1 step. For example, the first adjustment direction mark can be assigned a value of 0, and the second adjustment direction mark can be assigned a value of 1. When the adjustment direction mark is read as 0, the opening of the electronic expansion valve is controlled to increase by one step. When the adjustment direction mark is read as 1, the opening of the electronic expansion valve is controlled to decrease by one step.

[0086] S4, determining that the time for which the electronic expansion valve maintains the second opening exceeds a preset adjustment period and the acquisition parameters remain unchanged, determining that the time for which the electronic expansion valve maintains the second opening reaches a second preset time threshold, and recording the second indoor coil temperature.

[0087] Among them, the second preset time threshold can be set as needed. Considering that the collected information such as indoor ambient temperature has the hysteresis characteristic, the second preset time threshold can be set to be ≥ the preset adjustment period.

[0088] After the opening of the electronic expansion valve is adjusted to the second opening, if the time for which the electronic expansion valve maintains the second opening reaches a preset adjustment period, the operating parameters of the air conditioner such as the operating frequency of the compressor and the fan speed have not changed, and the collected indoor ambient temperature has not changed, or it is detected that the change range of the current air conditioner's collected parameters does not exceed the set range, there is no need to adjust the opening of the electronic expansion valve again for the time being.

[0089] S5, updating the electronic expansion valve opening database or reassigning the adjustment direction flag according to the first indoor coil temperature and the second indoor coil temperature.

[0090] Specifically, in cooling mode, it is determined that the first indoor coil temperature is lower than the second indoor coil temperature, and according to the electronic expansion valve opening partition condition, the corresponding opening in the electronic expansion valve opening database is updated to the current opening. By updating the electronic expansion valve opening database, the corresponding opening in the electronic expansion valve opening database is replaced with the current electronic expansion valve opening. The next time the electronic expansion valve opening is acquired, if the acquisition parameters are the same as the current acquisition parameters, a more accurate electronic expansion valve opening can be acquired, so that the air conditioner can perform at its best performance.

[0091] Alternatively, in the cooling mode, it is determined that the first indoor coil temperature is greater than or equal to the second indoor coil temperature, and the adjustment direction flag is reassigned. Among them, if the refrigeration performance of the air conditioner becomes worse after adjusting the opening of the single electronic expansion valve, that is, the opening of the electronic expansion valve before the adjustment, that is, the first opening, is more suitable for the current operating state than the second opening, then there is no need to update the electronic expansion valve opening database. And, in order to avoid the situation where the refrigeration performance of the air conditioner still deteriorates after the current adjustment in the next adjustment, the adjustment direction flag can be reassigned. For example, if the adjustment direction flag obtained this time is the first adjustment direction flag, it is considered that when performing intelligent adjustment, controlling the opening of the electronic expansion valve to increase the preset opening threshold is not the best adjustment method, then another adjustment method can be tried, and the direction flag is re-adjusted to the second adjustment direction flag. In the next adjustment, the opening of the electronic expansion valve is controlled to reduce the preset opening threshold, and the optimal opening is obtained by comparison and the electronic expansion valve opening database is updated, so that the air conditioner can perform the best performance under various conditions.

[0092] According to the control method of the air conditioner of the embodiment of the present invention, after the air conditioner is working stably, the electronic expansion valve opening database is queried according to the collected parameters and based on the electronic expansion valve opening partition conditions to read the corresponding optimal electronic expansion valve opening, and during the operation of the air conditioner, the electronic expansion valve opening size is intelligently adjusted, and the opening of the electronic expansion valve under the condition of better working performance of the air conditioner is obtained by comparing the changes in the indoor coil temperature before and after the adjustment of the electronic expansion valve opening, and the corresponding opening in the electronic expansion valve opening database is updated to the optimal opening in time, or the direction of subsequent adjustment of the opening of the electronic expansion valve is changed to ensure that the opening of the electronic expansion valve always maintains the optimal opening, so that the air conditioner can perform at its best under various conditions.

[0093] In some embodiments of the present invention, Figure 5 , which is a flow chart of a control method for an air conditioner according to another embodiment of the present invention, wherein the control method specifically includes steps S101 - S118, which are specifically as follows.

[0094] S101, before the air conditioner is turned on, the corresponding EEV opening, that is, the initial opening information, is read from the EEV opening database according to the EEV opening distinction condition, wherein the EEV opening distinction condition is the electronic expansion valve opening distinction condition, and the EEV opening database is the electronic expansion valve opening database.

[0095] S102, judging whether the time for which the EEV maintains the current opening after the compressor is started is ≥ Ts1, if yes, executing step S105; if no, executing step S104, the EEV maintains the current opening unchanged, wherein Ts1 is a preset time threshold.

[0096] S103, reading first opening information from an EEV opening database according to the EEV opening division condition.

[0097] S105, determining whether the time for which the EEV maintains the current opening degree ≥ the EEV adjustment period and the EEV opening degree partitioning condition changes, if yes, returning to step S103; if no, executing step S106.

[0098] S106, judging whether the time for which the EEV maintains the current opening degree ≥ Ts2 is satisfied, if not, returning to step S105; if yes, executing step S107, wherein Ts2 is a first preset time threshold.

[0099] S107, record the current indoor coil temperature as Te1.

[0100] S108, determining whether the EEV adjustment direction flag is 0, if yes, executing step S109; if no, executing step S110.

[0101] S109, the EEV opening increases by Evb steps, where Evb steps is a preset opening threshold.

[0102] S110, the EEV opening is reduced by Evb steps.

[0103] S111, determine whether the time for which the EEV maintains the current opening degree ≥ the EEV adjustment period and the EEV opening degree partitioning condition changes. If yes, return to step S103; if no, execute step S112.

[0104] S112, determine whether the time for which the EEV maintains the current opening degree is greater than or equal to Ts3, if not, return to step S1119 to re-determine; if yes, execute step S113, where Ts3 is a second preset time threshold.

[0105] S11, record the current indoor coil temperature Te2.

[0106] S12, determine whether the evaporator temperature before and after the EEV opening is adjusted satisfies Te2<Te1, if yes, execute step S115; if no, execute step S1164.

[0107] S115, replacing the corresponding EEV opening in the EEV opening database with the current EEV opening according to the EEV opening partitioning condition, and then returning to step S103.

[0108] S14, determining whether the EEV adjustment direction flag is 0, if not, executing step S117, if yes, executing step S118.

[0109] S151, the EEV adjustment direction flag is reassigned to 0, and then the process returns to step S103 for re-judgment.

[0110] S152, the EEV adjustment direction flag is reassigned to 1, and then the process returns to step S103 for re-judgment.

[0111] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0112] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: chassis; A refrigerant circulation loop is arranged in the casing, so that the refrigerant circulates in a loop composed of a compressor, a condenser, an expansion valve, an evaporator, a four-way valve and a pressure reducer; A refrigeration system is arranged in the casing, and performs heat exchange between the refrigerant and the indoor air in the compression refrigeration cycle of the refrigerant circulation loop. The refrigeration system includes the compressor, and the compressor is used to compress the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to the condenser; an electronic expansion valve, disposed between the condenser and the evaporator, the electronic expansion valve being used to increase the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is reduced, and to reduce the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is increased; An indoor coil temperature sensor is disposed in the housing and is used to detect the indoor coil temperature; The controller is configured as: Acquire acquisition parameters of the air conditioner, query an electronic expansion valve opening database according to the acquisition parameters and electronic expansion valve opening partition conditions, acquire first opening information and control the opening of the electronic expansion valve to be the first opening; Determine that the time for which the electronic expansion valve maintains the first opening exceeds a preset adjustment period and the acquisition parameter remains unchanged, determine that the time for which the electronic expansion valve maintains the first opening reaches a first preset time threshold, and record the first indoor coil temperature; reading an adjustment direction mark, and adjusting the opening of the electronic expansion valve according to the adjustment direction mark; Determine that the time for which the electronic expansion valve maintains the second opening exceeds a preset adjustment period and the acquisition parameter remains unchanged, determine that the time for which the electronic expansion valve maintains the second opening reaches a second preset time threshold, and record the second indoor coil temperature; The electronic expansion valve opening database is updated or the adjustment direction flag is reassigned according to the first indoor coil temperature and the second indoor coil temperature.

2. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: Indoor fan; An indoor environment temperature sensor is arranged in the housing and is used to detect the indoor environment temperature value; When acquiring the acquisition parameters of the air conditioner, querying the electronic expansion valve opening database according to the acquisition parameters and the electronic expansion valve opening partition condition, acquiring the first opening information and controlling the opening of the electronic expansion valve to be the first opening, the controller is specifically configured as follows: Acquire the operating frequency of the compressor, the indoor ambient temperature value and the indoor fan speed, and query the electronic expansion valve opening database according to the operating frequency of the compressor, the indoor ambient temperature value and the indoor fan speed to acquire first opening information; According to the first opening information, the electronic expansion valve is adjusted from an initial opening to the first opening.

3. The air conditioner according to claim 2, characterized in that: When the adjustment direction flag is read and the opening of the electronic expansion valve is adjusted according to the adjustment direction flag, the controller is specifically configured as follows: Determining that the adjustment direction mark is a first adjustment direction mark, and controlling the opening of the electronic expansion valve to increase a preset opening threshold; Alternatively, the adjustment direction mark is determined to be the second adjustment direction mark, and the opening of the electronic expansion valve is controlled to reduce the preset opening threshold.

4. The air conditioner according to claim 3, characterized in that: When the electronic expansion valve opening database is updated or the adjustment direction flag is reassigned according to the first indoor coil temperature and the second indoor coil temperature, the controller is specifically configured as follows: In cooling mode, determining that the first indoor coil temperature is lower than the second indoor coil temperature, and updating the corresponding opening in the electronic expansion valve opening database to the current opening according to the electronic expansion valve opening partition condition; Alternatively, in the cooling mode, it is determined that the first indoor coil temperature is greater than or equal to the second indoor coil temperature, and the adjustment direction flag is reassigned.

5. The air conditioner according to claim 4, characterized in that: When reassigning the adjustment direction flag, the controller is specifically configured as follows: Determine that the adjustment direction flag is the first adjustment direction flag, and reassign the adjustment direction flag as the second adjustment direction flag; Alternatively, the adjustment direction flag is determined to be the second adjustment direction flag, and the adjustment direction flag is reassigned to be the first adjustment direction flag.

6. The air conditioner according to claim 1, characterized in that: The controller is specifically configured as follows: Determining that the time for which the electronic expansion valve maintains the first opening does not exceed the preset adjustment period, controlling the opening of the electronic expansion valve to maintain the first opening, or determining that the time for which the electronic expansion valve maintains the first opening exceeds the preset adjustment period and the acquisition parameter changes, re-querying the electronic expansion valve opening database according to the electronic expansion valve opening partition condition, acquiring third opening information and controlling the opening of the electronic expansion valve to be the third opening; and, determining that the time for which the electronic expansion valve maintains the second opening does not exceed the preset adjustment period, controlling the opening of the electronic expansion valve to maintain the second opening, or, determining that the time for which the electronic expansion valve maintains the second opening exceeds the preset adjustment period and the acquisition parameter changes, re-querying the electronic expansion valve opening database according to the electronic expansion valve opening partition condition, acquiring fourth opening information and controlling the opening of the electronic expansion valve to be the fourth opening; The third opening information and the fourth opening information are the re-acquired first opening information, and the third opening and the fourth opening are the readjusted first opening.

7. The air conditioner according to claim 6, characterized in that: The first preset time threshold is ≥ the preset adjustment period, and the second preset time threshold is ≥ the preset adjustment period.

8. The air conditioner according to any one of claims 1 to 7, characterized in that: Before acquiring the first opening information and adjusting the opening of the electronic expansion valve to the first opening, the controller is specifically configured as follows: Before starting the machine, obtaining setting parameter information and environmental parameter information, querying the electronic expansion valve opening database according to the setting parameter information and the environmental parameter information, obtaining initial opening information, and controlling the opening of the electronic expansion valve to maintain the initial opening according to the initial opening information; After the compressor starts running, it is determined that the time for which the electronic expansion valve maintains the initial opening reaches an initial preset time threshold.

9. The air conditioner according to claim 8, characterized in that: The air conditioner also includes: An outdoor environment temperature sensor is arranged in the housing and is used to detect the outdoor environment temperature value; Outdoor fan; Before starting the machine, setting parameter information and environmental parameter information are obtained, the electronic expansion valve opening database is queried according to the setting parameter information and the environmental parameter information, initial opening information is obtained, and the opening of the electronic expansion valve is controlled to be maintained at the initial opening according to the initial opening information. The controller is specifically configured as follows: Determine that the air conditioner is about to start and operate, obtain the target operating frequency of the compressor, the indoor ambient temperature value, the outdoor ambient temperature value, the indoor fan gear and the outdoor fan gear, query the electronic expansion valve opening database according to the target operating frequency of the compressor, the indoor ambient temperature value, the outdoor ambient temperature value, the indoor fan gear and the outdoor fan gear, obtain the initial opening information, and control the opening of the electronic expansion valve to maintain the initial opening.

10. A method for controlling an air conditioner, characterized in that: For the air conditioner according to any one of claims 1 to 9, the method comprises the following steps: Acquire acquisition parameters of the air conditioner, query the electronic expansion valve opening database according to the acquisition parameters and the electronic expansion valve opening partition condition, acquire first opening information and control the opening of the electronic expansion valve to be the first opening; Determine that the time for which the electronic expansion valve maintains the first opening exceeds a preset adjustment period and the acquisition parameter remains unchanged, determine that the time for which the electronic expansion valve maintains the first opening reaches a first preset time threshold, and record the first indoor coil temperature; reading an adjustment direction mark, and adjusting the opening of the electronic expansion valve according to the adjustment direction mark; Determine that the time for which the electronic expansion valve maintains the second opening exceeds a preset adjustment period and the acquisition parameter remains unchanged, determine that the time for which the electronic expansion valve maintains the second opening reaches a second preset time threshold, and record the second indoor coil temperature; The electronic expansion valve opening database is updated or the adjustment direction flag is reassigned according to the first indoor coil temperature and the second indoor coil temperature.

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