Air conditioner

Abstract

The air conditioner comprises a controller, and the controller is configured to determine the target exhaust temperature of a compressor based on the outdoor environment temperature and the operation frequency of the compressor when the air conditioner is started to operate, and determine the difference value between the target exhaust temperature and the actual exhaust temperature of the compressor; determining the target opening degree of the electronic expansion valve based on the outdoor environment temperature, the operation frequency of the compressor and the gear of the outdoor fan; when the absolute value of a first difference value between the target opening degree of the electronic expansion valve and the actual opening degree of the electronic expansion valve reaches or exceeds a preset difference threshold value, the opening degree of the electronic expansion valve is controlled to be adjusted to the target opening degree, and after the electronic expansion valve continuously operates for a first preset time, the operation state of the electronic expansion valve is controlled according to the difference value, therefore, the air conditioner can reach a stable state more quickly, the problem of refrigerant noise caused by long-time back-and-forth vibration of the opening degree of the electronic expansion valve when the frequency of the compressor changes greatly is avoided, complaints of a user for the noise problem are reduced, and the comfort of the user is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioner. Background Technology

[0002] In the air conditioning industry, in order to balance cooling / heating performance, safety and user comfort, multiple fan speed modes are usually set. When switching the fan speed mode (for example, switching from the high fan speed to the silent mode), the compressor frequency will change accordingly, and the opening of the expansion valve will also change accordingly.

[0003] In existing technologies, the common technique for controlling the opening of the expansion valve is to obtain the compressor's exhaust temperature and control the valve opening accordingly. However, existing control logic does not consider the large frequency changes caused by changing the fan speed. For example, when switching from the high fan speed to the silent mode, according to the existing control logic, the electronic expansion valve will first increase the opening and then decrease it, with the opening oscillating back and forth. It takes two to three hours to stabilize. During this oscillation, the compressor frequency and the electronic expansion valve opening are mismatched, generating significant refrigerant noise that is transmitted to the room through the connecting pipe, severely affecting the user experience and causing user complaints. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] Therefore, one objective of this invention is to provide an air conditioner that, by acquiring the target opening degree of the electronic expansion valve, directly adjusts the opening degree of the electronic expansion valve to the target opening degree and maintains it for a preset time when the absolute value of the difference between the target opening degree and the actual opening degree is greater than a preset threshold. Simultaneously, feedback control is performed based on the difference between the target exhaust temperature and the actual exhaust temperature of the compressor. This allows for rapid and reasonable adjustment of the electronic expansion valve opening, reducing unreasonable changes in the opening degree and enabling the air conditioner to reach a stable state more quickly. This avoids the problem of refrigerant noise caused by prolonged oscillations in the electronic expansion valve opening due to significant changes in compressor frequency caused by outdoor fan speed switching in existing technologies. It effectively prevents the impact of refrigerant noise on user experience, reduces user complaints due to noise issues, and improves user comfort and satisfaction.

[0006] Therefore, a second objective of this invention is to provide a control method for an air conditioner.

[0007] To achieve the above objectives, an embodiment of the first aspect of the present invention provides an air conditioner comprising: a refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, a condenser, a throttling device, an evaporator, and a four-way valve, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger, and the throttling device is an electronic expansion valve; The electronic expansion valve is located between the condenser and the evaporator. The electronic expansion valve is used to increase the flow resistance of the refrigerant through the electronic expansion valve when its opening degree decreases, and to decrease the flow resistance of the refrigerant through the electronic expansion valve when its opening degree increases. Outdoor ambient temperature sensor, used to detect outdoor ambient temperature; An exhaust temperature sensor is used to detect the actual exhaust temperature of the compressor; The controller is configured to: When the air conditioner is turned on, the outdoor ambient temperature, the operating frequency of the compressor, the actual opening degree of the electronic expansion valve, the actual discharge temperature of the compressor, and the outdoor fan speed of the air conditioner are acquired. The target exhaust temperature of the compressor is determined based on the outdoor ambient temperature and the operating frequency of the compressor, and the difference between the target exhaust temperature and the actual exhaust temperature of the compressor is determined. The target opening degree of the electronic expansion valve is determined based on the outdoor ambient temperature, the operating frequency of the compressor, and the speed of the outdoor fan. When the absolute value of the first difference between the target opening degree of the electronic expansion valve and the actual opening degree of the electronic expansion valve reaches or exceeds a preset difference threshold, the opening degree of the electronic expansion valve is adjusted to the target opening degree, and after running for a first preset time, the operating state of the electronic expansion valve is controlled according to the difference.

[0008] According to an embodiment of the present invention, the air conditioner obtains the target opening degree of the electronic expansion valve. When the absolute value of the difference between the target opening degree and the actual opening degree is greater than a preset threshold, the opening degree of the electronic expansion valve is directly adjusted to the target opening degree and maintained for a preset duration. At the same time, feedback control is performed based on the difference between the target exhaust temperature and the actual exhaust temperature of the compressor. This allows for rapid and reasonable adjustment of the opening degree of the electronic expansion valve, reducing unreasonable changes in the opening degree and enabling the air conditioner to reach a stable state more quickly. This avoids the problem of refrigerant noise caused by prolonged oscillation of the electronic expansion valve opening due to large changes in compressor frequency caused by outdoor fan speed switching in the prior art. It effectively avoids the impact of refrigerant noise on user experience, reduces user complaints caused by noise problems, and improves user comfort and satisfaction.

[0009] In some embodiments, when determining the target opening of the electronic expansion valve based on the outdoor ambient temperature, the operating frequency of the compressor, and the outdoor fan speed, the controller is configured to: determine the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature; determine the corresponding opening compensation value based on the outdoor fan speed; and determine the target opening of the electronic expansion valve based on the outdoor ambient temperature, the operating frequency of the compressor, the temperature coefficient, the frequency coefficient, and the opening compensation value.

[0010] The above technical solution has the following beneficial effects: by determining the outdoor ambient temperature, its corresponding temperature coefficient and frequency coefficient, and the outdoor fan speed, its corresponding opening compensation value is determined. Through a predetermined calculation method, the target opening of the electronic expansion valve can be accurately determined, so as to quickly and reasonably adjust the opening of the electronic expansion valve. In some embodiments, when determining the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature, the controller is configured to: acquire the operating mode of the air conditioner, the operating mode including a cooling operating mode and a heating operating mode; determine the temperature zone corresponding to the outdoor ambient temperature under the operating mode; and query the pre-stored mapping relationship between temperature zone, temperature coefficient, and frequency coefficient in the controller to determine the temperature coefficient and the frequency coefficient.

[0011] The above technical solution has the following beneficial effects: by querying the mapping relationship table, the temperature coefficient and frequency coefficient corresponding to the current operating mode and outdoor ambient temperature zone can be accurately obtained, which can be used as key input parameters for subsequent calculation of the target opening degree of the electronic expansion valve, thereby realizing reasonable adjustment of the electronic expansion valve so that the opening degree of the electronic expansion valve can quickly stabilize.

[0012] In some embodiments, when determining the corresponding opening compensation value based on the outdoor fan speed, the controller is configured to: query the mapping relationship between outdoor fan speed and opening compensation value pre-stored in the controller according to the outdoor fan speed, so as to determine the opening compensation value.

[0013] The above technical solution has the following beneficial effects: by querying the mapping relationship table, the opening compensation value corresponding to the outdoor fan speed can be accurately obtained, and the target opening of the electronic expansion valve can be compensated, thereby realizing the reasonable adjustment of the electronic expansion valve so that the opening of the electronic expansion valve can quickly stabilize.

[0014] In some embodiments, before determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature and the operating frequency of the compressor, the controller is further configured to: control the electronic expansion valve to operate at a preset initial opening degree for a second preset duration, and then control the operating state of the electronic expansion valve according to the difference.

[0015] The above technical solution has the following beneficial effects: after the electronic expansion valve is controlled to run at a preset initial opening for a second preset time, the operating state of the electronic expansion valve is controlled according to the difference, so that the air conditioning system is more stable during the start-up and initial operation phases, avoiding the problem of air conditioning system instability caused by unreasonable initial opening or premature complex adjustments.

[0016] In some embodiments, when controlling the operating state of the electronic expansion valve based on the difference, the controller is configured to: control the opening degree of the electronic expansion valve to decrease when the difference is greater than zero; control the opening degree of the electronic expansion valve to remain unchanged when the difference is equal to zero; and control the opening degree of the electronic expansion valve to increase when the difference is less than zero.

[0017] The above technical solution has the following beneficial effects: By controlling the change in the opening of the electronic expansion valve according to the difference between the target exhaust temperature and the actual exhaust temperature, the air conditioning system can dynamically adjust the refrigerant flow according to the actual operating conditions to maintain the stable operation of the air conditioner.

[0018] In some embodiments, after controlling the opening of the electronic expansion valve to be adjusted to the target opening and running continuously for a first preset time, the controller is configured to: control the operating state of the electronic expansion valve according to the difference with a third preset time as the adjustment period, and after a preset number of adjustment periods, redetermine the second absolute value of the difference between the target opening of the electronic expansion valve and the actual opening of the electronic expansion valve; and control the operating state of the electronic expansion valve based on the second absolute value of the difference.

[0019] The above technical solution has the following beneficial effects: It avoids the problem that the outdoor heat exchange coefficient will decrease and the compressor exhaust temperature will increase due to dust accumulation on the outdoor unit's condenser, mismatch between the coefficient predetermined at the factory and the condenser after the air conditioner is used, and other reasons, which would prevent the electronic expansion valve from stabilizing at a reasonable opening even after adjustment.

[0020] In some embodiments, when controlling the operating state of the electronic expansion valve based on the absolute value of the second difference, the controller is configured to: when the absolute value of the second difference reaches or exceeds a preset difference threshold, control the electronic expansion valve to stop adjusting its opening, and correct the re-determined target opening of the electronic expansion valve based on the absolute value of the second difference to obtain the corrected target opening of the electronic expansion valve; and control the operating state of the electronic expansion valve based on the corrected target opening of the electronic expansion valve.

[0021] The above technical solution has the following beneficial effects: by controlling the operating state of the electronic expansion valve based on the target opening degree of the modified electronic expansion valve, the opening degree of the electronic expansion valve can quickly approach a stable state, thereby enabling the air conditioner to reach a stable state more quickly.

[0022] In some embodiments, when correcting the target opening of the re-determined electronic expansion valve based on the absolute value of the second difference, the controller is configured to: obtain the sum of the absolute value of the second difference and the opening compensation value, and use the sum as a new opening compensation value; determine the corrected target opening of the electronic expansion valve based on the outdoor ambient temperature, the operating frequency of the compressor, the outdoor fan speed, and the new opening compensation value.

[0023] The above technical solution has the following beneficial effects: by determining a new opening compensation value, and taking into account the outdoor ambient temperature, the compressor's operating frequency, the outdoor fan speed, and the new opening compensation value, the target opening of the corrected electronic expansion valve can be accurately determined through the built-in algorithm or mapping relationship.

[0024] In some embodiments, after determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the operating frequency of the compressor, and the speed of the outdoor fan, the controller is further configured to: control the electronic expansion valve to maintain the actual opening degree when the absolute value of the first difference between the target opening degree of the electronic expansion valve and the actual opening degree of the electronic expansion valve does not reach a preset difference threshold.

[0025] The above technical solution has the following beneficial effects: it can avoid the problem of fluctuations in the parameters of the air conditioning system caused by frequent adjustments to the electronic expansion valve due to slight differences in opening degree, which would affect the stable operation of the air conditioner.

[0026] To achieve the above objectives, a second aspect of the present invention provides a control method for an air conditioner, the method comprising the following steps: receiving the three-phase current; determining the zero-crossing point of the three-phase current; determining the rotor angle and speed of the outdoor fan based on the zero-crossing point of the three-phase current; and controlling the operating state of the outdoor fan based on the rotor angle and the speed to achieve forward and reverse start-up of the outdoor fan.

[0027] According to the air conditioner control method of the present invention, by acquiring the target opening degree of the electronic expansion valve, when the absolute value of the difference between the target opening degree and the actual opening degree is greater than a preset threshold, the opening degree of the electronic expansion valve is directly adjusted to the target opening degree and maintained for a preset duration. At the same time, feedback control is performed based on the difference between the target exhaust temperature and the actual exhaust temperature of the compressor. This allows for rapid and reasonable adjustment of the opening degree of the electronic expansion valve, reducing unreasonable changes in the opening degree and enabling the air conditioner to reach a stable state more quickly. This avoids the problem of refrigerant noise caused by prolonged oscillation of the electronic expansion valve opening due to large changes in compressor frequency caused by outdoor fan speed switching in the prior art. It effectively avoids the impact of refrigerant noise on user experience, reduces user complaints caused by noise problems, and improves user comfort and satisfaction.

[0028] 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. Attached Figure Description

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the refrigeration cycle system of an air conditioner according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the controller according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an air conditioner according to another embodiment of the present invention; Figure 5 This is a flowchart illustrating a control method for an air conditioner according to an embodiment of the present invention; Figure 6 This is a flowchart illustrating how, according to an embodiment of the present invention, the target opening degree of an electronic expansion valve is determined based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan speed. Figure 7 This is a flowchart illustrating the process of determining the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature according to an embodiment of the present invention. Figure 8 This is a schematic flowchart illustrating the operation of an electronic expansion valve based on a difference, according to an embodiment of the present invention. Figure 9 This is a flowchart illustrating a control method for an air conditioner according to another embodiment of the present invention; Figure 10This is a flowchart illustrating the operation of an electronic expansion valve based on the second absolute value of the difference, according to an embodiment of the present invention. Figure 11 This is a schematic diagram of a process for correcting the target opening of an electronic expansion valve based on the absolute value of a second difference, according to an embodiment of the present invention. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] like Figure 1 As shown, in this invention, the air conditioner 1 performs a refrigeration cycle by using a compressor, condenser, evaporator, throttling device, and four-way valve. The refrigeration cycle includes a series of processes involving compression, condensation, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0035] The compressor compresses the refrigerant gas, which is in a high-temperature, high-pressure state and enters through the return pipe, and then discharges the compressed refrigerant gas through the exhaust pipe. The discharged refrigerant gas flows into the condenser through the condenser inlet pipe. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0036] The evaporator evaporates the refrigerant that expands in the throttling device and returns the refrigerant gas, now at a low temperature and low pressure, to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, air conditioner 1 regulates the temperature of the indoor space.

[0037] Combination Figure 2 As shown, the air conditioner 1 in this application includes an indoor unit 13 and an outdoor unit 12, which can be configured as split-type units. The indoor unit 13 can be configured as a wall-mounted unit, a ceiling-mounted unit, a ducted unit, etc., and the indoor unit 13 is installed on the top or ceiling of the indoor room.

[0038] Taking indoor wall-mounted units as an example, indoor wall-mounted units are usually installed on indoor walls or other locations. For example, indoor cabinet units (not shown in the figure) are also a type of indoor unit 13.

[0039] Taking a split-type air conditioner as an example, the air conditioner 1 includes an indoor unit 13 and an outdoor unit 12. The outdoor unit 12 is usually installed outdoors and is used for heat exchange in the indoor environment.

[0040] Furthermore, the air conditioner 1 includes a controller 71 to control the operation of various components within the air conditioner 1, enabling each component to perform its predetermined functions. The air conditioner 1 also includes a control device 200, which, exemplarily, is a remote control. This remote control has the capability to communicate with the controller 71, for example, using infrared or other communication methods. The remote control allows the user to perform various controls on the air conditioner 1, enabling interaction between the user and the air conditioner 1.

[0041] In this embodiment of the application, the indoor unit 13 of the air conditioner 1 is located at the top or upper part of the room. Generally, the installation height of the indoor unit 13 is higher than the user's activity area. The indoor unit 13 includes a return air vent 17 and an air outlet 16 that communicate with the room. Indoor air flows back into the room through the return air vent 17 and the indoor unit 13, and then through the air outlet 16.

[0042] An air guide plate 2 is installed at the air outlet 16. By changing its relative rotation angle with the air outlet 16, the air guide plate 2 adjusts the outflow direction of the air flowing through the air outlet 12, thereby affecting the stratification of indoor air temperature.

[0043] This application embodiment also provides a hardware structure diagram of the controller 71, such as... Figure 3 As shown, the controller 71 includes a processor 83, and optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, memory 82, and communication interface 84 are connected via a bus 81.

[0044] Processor 83 can be a central processing unit (CPU), a general-purpose processor (NP), a network processor (NP), a digital signal processor (DSP), a microprocessor (Microcontroller), a programmable logic device (PLD), or any combination thereof. Processor 83 can also be any other device with processing capabilities, such as a circuit, device, or software module. Processor 83 can also include multiple CPUs, and processor 83 can be a single-core processor. CPU) processor 83, or multi-core (multi) CPU) Processor 83. Here, processor 83 may refer to one or more devices, circuits, or processing cores used to process data (such as computer program instructions).

[0045] Memory 82 can be a read-only memory 82 (read ROM (Read-Only Memory) or other types of static storage devices capable of storing static information and instructions; random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions; or electrically erasable programmable read-only memory (EEPROM). EEPROM (Electronic EPROM-only memory) and Compact Disc Retrieval System (CD-ROM) Only memory, CD The storage medium can be ROM or other optical disc storage, optical disk storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This application embodiment does not impose any limitations on this. The memory 82 can exist independently or be integrated with the processor 83. The memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the control method of the air conditioner 1 provided in this application embodiment.

[0046] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 84 can be a module, circuit, transceiver, or any device capable of communication.

[0047] Bus 81 can be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81, etc. Bus 81 can be divided into address bus 81, data bus 81, control bus 81, etc.

[0048] The following is combined Figures 4-11 An air conditioner 1 and its control method according to an embodiment of the present invention are described.

[0049] In some embodiments, combined with Figure 4 As shown, the air conditioner 1 includes: a refrigerant circulation loop 10, which allows the refrigerant to circulate in a loop consisting of a compressor, condenser, throttling device, evaporator and four-way valve. One of the condenser and evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger. The throttling device is an electronic expansion valve. The electronic expansion valve is located between the condenser and the evaporator. When its opening degree decreases, the flow resistance of the refrigerant passing through the electronic expansion valve increases, and when its opening degree increases, the flow resistance of the refrigerant passing through the electronic expansion valve decreases.

[0050] In some embodiments, combined with Figure 4 As shown, the air conditioner 1 may include an outdoor ambient temperature sensor 11 for detecting the outdoor ambient temperature.

[0051] In some embodiments, such as Figure 4 As shown, the air conditioner 1 may include: an exhaust temperature sensor 14, used to detect the actual exhaust temperature of the compressor.

[0052] In some embodiments, such as Figure 4 As shown, the air conditioner 1 may include: a controller 71, which is configured to: acquire the outdoor ambient temperature, the operating frequency of the compressor, the actual opening degree of the electronic expansion valve, the actual discharge temperature of the compressor, and the outdoor fan speed of the air conditioner 1 when the air conditioner 1 is turned on. The target discharge temperature of the compressor is determined based on the outdoor ambient temperature and the operating frequency of the compressor, and the difference between the target discharge temperature and the actual discharge temperature of the compressor is determined. The target opening degree of the electronic expansion valve is determined based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan speed. When the absolute value of the first difference between the target opening degree and the actual opening degree of the electronic expansion valve reaches or exceeds the preset difference threshold, the opening degree of the electronic expansion valve is adjusted to the target opening degree and continues to run for a first preset time. Then, the operating state of the electronic expansion valve is controlled according to the difference.

[0053] Specifically, when the air conditioner 1 is turned on, the outdoor ambient temperature can be obtained by the outdoor ambient temperature sensor 11 installed on the outer casing of the air conditioner 1, the operating frequency of the compressor can be obtained by the frequency detection device (such as the frequency sensor light in the inverter module) installed inside the air conditioner 1, the actual opening degree of the electronic expansion valve can be obtained by the opening degree sensor of the electronic expansion valve, the actual exhaust temperature of the compressor can be obtained by the exhaust temperature sensor 14 installed at the exhaust pipe of the compressor, and the outdoor fan speed recorded inside the controller 71 can be obtained.

[0054] Furthermore, the target exhaust temperature of the compressor can be determined based on the mapping relationship between the outdoor ambient temperature, the compressor's operating frequency, and the compressor's target exhaust temperature. The specific mapping relationship is: target exhaust temperature = frequency coefficient × compressor operating frequency + temperature coefficient × outdoor ambient temperature. The frequency coefficient and temperature coefficient can be obtained, but are not limited to, based on the mapping relationship between the outdoor ambient temperature and the frequency coefficient and temperature coefficient. Furthermore, the difference between the target exhaust temperature and the compressor's actual exhaust temperature can be determined.

[0055] Furthermore, the target opening degree of the electronic expansion valve can be determined based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan speed. This includes, but is not limited to, determining the target opening degree of the electronic expansion valve based on the mapping relationship between the outdoor ambient temperature, the compressor's operating frequency, the outdoor fan speed, and the target opening degree of the electronic expansion valve.

[0056] Furthermore, when the absolute value of the first difference between the target opening degree and the actual opening degree of the electronic expansion valve reaches or exceeds the preset difference threshold, it indicates that there is a large deviation between the actual opening degree and the target opening degree of the electronic expansion valve. The air conditioning system is unstable and cannot quickly recover to a stable state. The electronic expansion valve body may generate a large amount of refrigerant noise for a long time. Therefore, the opening degree of the electronic expansion valve can be directly adjusted to the target opening degree and run continuously for a first preset time. Then, the opening degree of the electronic expansion valve can be continuously adjusted according to the difference, so that the actual opening degree gradually approaches the target opening degree, and finally the air conditioner 1 reaches the optimal operating state.

[0057] According to an embodiment of the present invention, the air conditioner 1 obtains the target opening degree of the electronic expansion valve. When the absolute value of the difference between the target opening degree and the actual opening degree is greater than a preset threshold, the opening degree of the electronic expansion valve is directly adjusted to the target opening degree and maintained for a preset duration. At the same time, feedback control is performed based on the difference between the target exhaust temperature and the actual exhaust temperature of the compressor. This allows for rapid and reasonable adjustment of the opening degree of the electronic expansion valve, reducing unreasonable changes in the opening degree and enabling the air conditioner 1 to reach a stable state more quickly. This avoids the problem of refrigerant noise caused by prolonged oscillation of the electronic expansion valve opening due to large changes in compressor frequency caused by outdoor fan speed switching in the prior art. It effectively avoids the impact of refrigerant noise on user experience, reduces user complaints caused by noise problems, and improves user comfort and satisfaction. In one embodiment of the present invention, when determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the operating frequency of the compressor and the outdoor fan speed, the controller 71 is configured to: determine the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature. Determine the corresponding opening compensation value based on the outdoor fan speed; The target opening of the electronic expansion valve is determined based on the outdoor ambient temperature, the compressor's operating frequency, temperature coefficient, frequency coefficient, and opening compensation value.

[0058] Specifically, when determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan speed, since the temperature coefficient and frequency coefficient are set according to the degree of influence of the outdoor ambient temperature on the opening degree of the electronic expansion valve, the corresponding temperature coefficient and frequency coefficient can be determined based on the outdoor ambient temperature, including but not limited to dividing the outdoor ambient temperature into zones to determine different temperature coefficients and frequency coefficients based on different temperature zones.

[0059] Furthermore, since the outdoor fan speed determines the heat exchange efficiency of the outdoor heat exchanger, for example, the high speed represents forced heat exchange with high efficiency, while the silent speed represents gentle heat exchange with low efficiency. Since the heat exchange efficiency directly affects the pressure balance of the air conditioning system and the required refrigerant flow, the corresponding opening compensation value can be determined based on the outdoor fan speed.

[0060] Furthermore, the target opening of the electronic expansion valve can be determined based on the outdoor ambient temperature, the compressor's operating frequency, temperature coefficient, frequency coefficient, and opening compensation value. The specific mapping formula is: target opening = outdoor ambient temperature × temperature coefficient + frequency coefficient × compressor operating frequency + compensation value C. Among them, the frequency coefficient and temperature coefficient can be determined based on the mapping relationship between the outdoor ambient temperature and the frequency coefficient and temperature coefficient, and the compensation value C can be determined based on the outdoor fan speed.

[0061] In one embodiment of the present invention, when determining the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature, the controller 71 is configured to: acquire the operating mode of the air conditioner 1, the operating mode including a cooling operating mode and a heating operating mode. Determine the temperature zone corresponding to the outdoor ambient temperature under the operating mode; Query the pre-stored mapping relationship between temperature zone, temperature coefficient, and frequency coefficient in controller 71 to determine the temperature coefficient and frequency coefficient.

[0062] Specifically, when determining the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature, since the refrigerant circulation direction is opposite in different operating modes of air conditioner 1, the role of the heat exchanger will be interchanged. Under the same outdoor ambient temperature, the air conditioning system's demand for refrigerant flow is completely different. Therefore, the operating mode of air conditioner 1 can be obtained first. The operating modes include cooling operating mode and heating operating mode.

[0063] Furthermore, the temperature zones corresponding to different operating modes of the outdoor environment can be determined. For example, if the applicable environment for air conditioner 1 in cooling mode is 19 to 46 degrees Celsius, then 19 to 46 degrees Celsius can be divided into three different temperature zones: low, medium, and high. For example, 19 to 30 degrees Celsius is the low temperature zone, 31 to 38 degrees Celsius is the medium temperature zone, and 39 to 46 degrees Celsius is the high temperature zone, thus determining the temperature zone corresponding to the current outdoor environment temperature. Similarly, if the applicable environment for air conditioner 1 in heating mode is 0 to 24 degrees Celsius, then below 0 degrees Celsius can be determined as the low temperature zone, 1 to 15 degrees Celsius as the high temperature zone, and 16 to 24 degrees Celsius as the high temperature zone, thus determining the temperature zone corresponding to the current outdoor environment temperature.

[0064] Furthermore, the mapping relationship between temperature zone, temperature coefficient, and frequency coefficient pre-stored in controller 71 can be queried to determine the temperature coefficient and frequency coefficient. It is understood that controller 71 pre-stores a mapping relationship table of temperature zone, temperature coefficient, and frequency coefficient for different operating modes. This mapping relationship table is derived from extensive experiments and data analysis, and it records in detail the temperature coefficient and frequency coefficient corresponding to each temperature zone under different operating modes. That is, the pre-stored mapping relationship table stores multiple sets of temperature zone, temperature coefficient, and frequency coefficient mapping relationships, and at least one set stores the mapping relationship between the current outdoor ambient temperature and its temperature coefficient and frequency coefficient.

[0065] In one embodiment of the present invention, when determining the corresponding opening compensation value based on the outdoor fan speed, the controller 71 is configured to: query the mapping relationship between outdoor fan speed and opening compensation value pre-stored in the controller 71 according to the outdoor fan speed, so as to determine the opening compensation value.

[0066] Specifically, when determining the corresponding opening compensation value based on the outdoor fan speed, the heat exchange efficiency of the outdoor heat exchanger will change when the outdoor fan speed is different. If the opening of the electronic expansion valve is not adjusted accordingly, it may lead to a mismatch between the refrigerant flow and the heat exchange capacity of the heat exchanger, thereby affecting the cooling or heating effect of the air conditioner. Therefore, the opening compensation value can be determined by querying the mapping relationship between outdoor fan speed and opening compensation value pre-stored in the controller 71 based on the outdoor fan speed. It can be understood that the pre-stored mapping relationship between outdoor fan speed and opening compensation value includes multiple sets of mapping relationships between outdoor fan speed and opening compensation value, and includes at least one set of mapping relationship between the current outdoor fan speed and opening compensation value.

[0067] In one embodiment of the present invention, before determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature and the operating frequency of the compressor, the controller 71 is further configured to: control the electronic expansion valve to operate at a preset initial opening degree for a second preset time, and then control the operating state of the electronic expansion valve according to the difference.

[0068] Specifically, before determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature and the compressor's operating frequency, i.e. when the air conditioner 1 has just been turned on or has been running for a short time, in order to avoid the impact on the opening degree control of the electronic expansion valve due to uneven refrigerant distribution in the air conditioner 1 and drastic changes in parameters such as exhaust temperature, the operating state of the electronic expansion valve can be controlled according to the difference after the electronic expansion valve has been running at a preset initial opening degree for a second preset time. This makes the air conditioning system more stable during the start-up and initial operation phases, avoiding instability caused by unreasonable initial opening degree or premature complex adjustments.

[0069] In one embodiment of the present invention, when controlling the operating state of the electronic expansion valve according to the difference, the controller 71 is configured to: reduce the opening degree of the electronic expansion valve when the difference is greater than zero; When the difference is zero, the opening of the electronic expansion valve remains unchanged. When the difference is less than zero, the opening of the electronic expansion valve is increased.

[0070] Specifically, when controlling the operation of the electronic expansion valve based on the difference, if the difference is greater than zero, it means that the actual exhaust temperature is lower than the target exhaust temperature. This indicates that the electronic expansion valve is opening too wide, causing too much refrigerant to enter the compressor, resulting in a relatively lower compression ratio and a drop in exhaust temperature. In this case, the opening of the electronic expansion valve can be reduced to decrease the refrigerant flow into the compressor, thereby increasing the compression ratio of the compressor and thus raising the actual exhaust temperature.

[0071] Furthermore, when the difference is zero, it means that the actual exhaust temperature is close to the target exhaust temperature. The current exhaust state of the compressor has just reached the desired state of the air conditioning system. The refrigerant flow and the compressor operating parameters are well matched, and the air conditioning system is in a relatively stable and efficient working state. At this time, the opening of the electronic expansion valve can be kept constant.

[0072] Furthermore, when the difference is less than zero, meaning the target exhaust temperature is lower than the actual exhaust temperature, it indicates that the actual exhaust temperature of the compressor is higher than the expected value. The electronic expansion valve opening is too small, resulting in insufficient refrigerant flow into the compressor. This prevents the heat generated by the compressor during compression from being carried away by the refrigerant in time, leading to an increase in exhaust temperature. In this case, the opening of the electronic expansion valve can be increased to increase the refrigerant flow into the compressor, thereby reducing the actual exhaust temperature and allowing the actual exhaust temperature to re-balance with the target exhaust temperature, ensuring the stable operation of the air conditioning system.

[0073] In one embodiment of the present invention, after the opening of the electronic expansion valve is adjusted to the target opening and the operation continues for a first preset time, the controller 71 is configured to: control the operating state of the electronic expansion valve according to the difference with a third preset time as the adjustment cycle, and after a preset number of adjustment cycles, redetermine the second absolute value of the difference between the target opening of the electronic expansion valve and the actual opening of the electronic expansion valve; and control the operating state of the electronic expansion valve based on the second absolute value of the difference.

[0074] Specifically, during use, the outdoor unit's condenser may accumulate dust, and the factory-set coefficient of the air conditioner may become mismatched with the condenser after use, leading to a decrease in the outdoor heat exchange coefficient and an increase in the compressor's exhaust temperature. This causes the electronic expansion valve's opening to remain unstable even after adjustment. Therefore, after adjusting the electronic expansion valve to the target opening and running it for a first preset time, a third preset time can be used as the adjustment cycle. The operating state of the electronic expansion valve is controlled based on the difference. After a preset number of adjustment cycles, the absolute value of the second difference between the target opening and the actual opening of the electronic expansion valve is redefined. This second absolute value is used to control the electronic expansion valve's operating state, allowing the air conditioner to reach a stable state more quickly. This avoids the refrigerant noise problem caused by prolonged oscillations in the electronic expansion valve opening due to significant compressor frequency changes caused by outdoor fan speed switching, as seen in existing technologies. This effectively prevents refrigerant noise from affecting the user experience, reduces user complaints related to noise, and improves user comfort and satisfaction. In one embodiment of the present invention, when controlling the operating state of the electronic expansion valve based on the absolute value of the second difference, the controller 71 is configured to: when the absolute value of the second difference reaches or exceeds a preset difference threshold, control the electronic expansion valve to stop adjusting the opening, and correct the target opening of the re-determined electronic expansion valve based on the absolute value of the second difference to obtain the corrected target opening of the electronic expansion valve; and control the operating state of the electronic expansion valve based on the corrected target opening of the electronic expansion valve.

[0075] Specifically, when the absolute value of the second difference reaches or exceeds the preset difference threshold, it indicates that there is still a large deviation between the actual opening of the electronic expansion valve and the target opening of the redefined electronic expansion valve. The air conditioning system is unstable and cannot quickly return to a stable state. The electronic expansion valve body may generate a large amount of refrigerant noise for a long time. Therefore, in order to avoid the negative impact of blind adjustment, the electronic expansion valve can be controlled to stop the opening adjustment, and the target opening of the redefined electronic expansion valve can be corrected based on the absolute value of the second difference to obtain the corrected target opening of the electronic expansion valve. The operating state of the electronic expansion valve can be controlled based on the corrected target opening of the electronic expansion valve so that the opening of the electronic expansion valve quickly tends to a stable state, thereby enabling the air conditioner 1 to reach a stable state more quickly. In one embodiment of the present invention, when the target opening of the re-determined electronic expansion valve is corrected based on the absolute value of the second difference, the controller 71 is configured to: obtain the sum of the absolute value of the second difference and the opening compensation value, and use the sum as the new opening compensation value; The target opening of the corrected electronic expansion valve is determined based on the outdoor ambient temperature, the compressor's operating frequency, the outdoor fan speed, and the new opening compensation value.

[0076] Specifically, when correcting the redefined target opening of the electronic expansion valve based on the absolute value of the second difference, the existing opening deviation (absolute value of the second difference) can be incorporated into the opening compensation system. That is, by adding the absolute value of the second difference to the original opening compensation value, the new opening compensation value can more comprehensively reflect the current actual situation of the air conditioning system, thus providing a more accurate basis for determining the corrected target opening. For example, if the absolute value of the second difference is 60 steps and the original opening compensation value is 0 steps, then the new opening compensation value is 60 steps. Furthermore, the corrected target opening of the electronic expansion valve can be determined based on the outdoor ambient temperature, the compressor's operating frequency, the outdoor fan speed, and the new opening compensation value, i.e., target opening = outdoor ambient temperature × temperature coefficient + frequency coefficient × compressor operating frequency + new compensation value D.

[0077] In one embodiment of the present invention, after determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the operating frequency of the compressor and the speed of the outdoor fan, the controller 71 is further configured to: control the electronic expansion valve to maintain the actual opening degree when the absolute value of the first difference between the target opening degree of the electronic expansion valve and the actual opening degree of the electronic expansion valve does not reach a preset difference threshold.

[0078] Specifically, after determining the target opening of the electronic expansion valve based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan speed, if the absolute value of the first difference does not reach the preset difference threshold, it indicates that the difference between the actual opening of the electronic expansion valve and the target opening is small, meaning that the deviation between the actual opening of the electronic expansion valve and the target opening is within an acceptable range. In this case, to avoid frequent adjustments to the electronic expansion valve due to small opening differences, which could cause fluctuations in the parameters of the air conditioning system and affect the stable operation of the air conditioner 1, the electronic expansion valve can be controlled to maintain its actual opening, i.e., the opening of the electronic expansion valve is not adjusted.

[0079] According to an embodiment of the present invention, the air conditioner 1 obtains the target opening degree of the electronic expansion valve. When the absolute value of the difference between the target opening degree and the actual opening degree is greater than a preset threshold, the opening degree of the electronic expansion valve is directly adjusted to the target opening degree and maintained for a preset duration. At the same time, feedback control is performed based on the difference between the target exhaust temperature and the actual exhaust temperature of the compressor. This allows for rapid and reasonable adjustment of the opening degree of the electronic expansion valve, reducing unreasonable changes in the opening degree and enabling the air conditioner 1 to reach a stable state more quickly. This avoids the problem of refrigerant noise caused by prolonged oscillation of the electronic expansion valve opening due to large changes in compressor frequency caused by outdoor fan speed switching in the prior art. It effectively avoids the impact of refrigerant noise on user experience, reduces user complaints caused by noise problems, and improves user comfort and satisfaction.

[0080] like Figure 5 As shown, the present invention proposes a control method for an air conditioner, comprising at least steps S1-S4: Step S1: When the air conditioner is turned on, obtain the outdoor ambient temperature, the compressor operating frequency, the actual opening degree of the electronic expansion valve, the actual discharge temperature of the compressor, and the outdoor fan speed of the air conditioner.

[0081] Step S2: Determine the target exhaust temperature of the compressor based on the outdoor ambient temperature and the compressor's operating frequency, and determine the difference between the target exhaust temperature and the compressor's actual exhaust temperature.

[0082] Step S3: Determine the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan speed.

[0083] Step S4: When the absolute value of the first difference between the target opening degree and the actual opening degree of the electronic expansion valve reaches or exceeds the preset difference threshold, the opening degree of the electronic expansion valve is adjusted to the target opening degree and continues to run for a first preset time. Then, the operating state of the electronic expansion valve is controlled according to the difference.

[0084] In some embodiments, combined with Figure 6 As shown, the target opening degree of the electronic expansion valve is determined based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan speed. This includes: determining the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature; determining the corresponding opening degree compensation value based on the outdoor fan speed; and determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the compressor's operating frequency, the temperature coefficient, the frequency coefficient, and the opening degree compensation value.

[0085] In some embodiments, combined with Figure 7 As shown, determining the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature includes: obtaining the air conditioner's operating mode, which includes a cooling operating mode and a heating operating mode; determining the temperature zone corresponding to the outdoor ambient temperature under the operating mode; and querying the pre-stored mapping relationship between temperature zone, temperature coefficient, and frequency coefficient in the controller to determine the temperature coefficient and frequency coefficient.

[0086] In some embodiments, determining the corresponding opening compensation value based on the outdoor fan speed includes: querying the mapping relationship between outdoor fan speed and opening compensation value pre-stored in the controller according to the outdoor fan speed to determine the opening compensation value.

[0087] In some embodiments, before determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature and the operating frequency of the compressor, the method further includes: controlling the electronic expansion valve to operate at a preset initial opening degree for a second preset time, and then controlling the operating state of the electronic expansion valve based on the difference.

[0088] In some embodiments, combined with Figure 8 As shown, the operating state of the electronic expansion valve is controlled according to the difference, including: when the difference is greater than zero, the opening degree of the electronic expansion valve is reduced; when the difference is equal to zero, the opening degree of the electronic expansion valve remains unchanged; when the difference is less than zero, the opening degree of the electronic expansion valve is increased.

[0089] In some embodiments, combined with Figure 9 As shown, after adjusting the opening of the electronic expansion valve to the target opening and running it continuously for a first preset time, the method further includes: using a third preset time as the adjustment cycle, controlling the operating state of the electronic expansion valve according to the difference, and after a preset number of adjustment cycles, re-determining the second absolute value of the difference between the target opening of the electronic expansion valve and the actual opening of the electronic expansion valve; and controlling the operating state of the electronic expansion valve based on the second absolute value of the difference.

[0090] In some embodiments, combined with Figure 10 As shown, controlling the operating state of the electronic expansion valve based on the absolute value of the second difference includes: when the absolute value of the second difference reaches or exceeds a preset difference threshold, controlling the electronic expansion valve to stop adjusting the opening, and correcting the target opening of the electronic expansion valve after re-determining based on the absolute value of the second difference to obtain the corrected target opening of the electronic expansion valve; controlling the operating state of the electronic expansion valve based on the corrected target opening of the electronic expansion valve.

[0091] In some embodiments, combined with Figure 11 As shown, the target opening of the electronic expansion valve is corrected based on the absolute value of the second difference, including: obtaining the sum of the absolute value of the second difference and the opening compensation value, and using the sum as the new opening compensation value; and determining the corrected target opening of the electronic expansion valve based on the outdoor ambient temperature, the compressor's operating frequency, the outdoor fan speed, and the new opening compensation value.

[0092] In some embodiments, after determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the operating frequency of the compressor, and the outdoor fan speed, the method further includes: when the absolute value of the first difference between the target opening degree of the electronic expansion valve and the actual opening degree of the electronic expansion valve does not reach a preset difference threshold, controlling the electronic expansion valve to maintain the actual opening degree.

[0093] It should be noted that the specific implementation method of controlling the air conditioner is similar to that of the air conditioner in any of the above embodiments of the present invention. Therefore, for a detailed exemplary description of the control process of the air conditioner, please refer to the relevant description of the air conditioner mentioned above. To reduce redundancy, it will not be repeated here.

[0094] According to the air conditioner control method of the present invention, by acquiring the target opening degree of the electronic expansion valve, when the absolute value of the difference between the target opening degree and the actual opening degree is greater than a preset threshold, the opening degree of the electronic expansion valve is directly adjusted to the target opening degree and maintained for a preset duration. At the same time, feedback control is performed based on the difference between the target exhaust temperature and the actual exhaust temperature of the compressor. This allows for rapid and reasonable adjustment of the opening degree of the electronic expansion valve, reducing unreasonable changes in the opening degree and enabling the air conditioner to reach a stable state more quickly. This avoids the problem of refrigerant noise caused by prolonged oscillation of the electronic expansion valve opening due to large changes in compressor frequency caused by outdoor fan speed switching in the prior art. It effectively avoids the impact of refrigerant noise on user experience, reduces user complaints caused by noise problems, and improves user comfort and satisfaction.

[0095] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0096] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that, include: The refrigerant circulation loop allows the refrigerant to circulate in a loop consisting of a compressor, condenser, throttling device, evaporator, and four-way valve. One of the condensers and the other of the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger. The throttling device is an electronic expansion valve. The electronic expansion valve is located between the condenser and the evaporator. The electronic expansion valve is used to increase the flow resistance of the refrigerant through the electronic expansion valve when its opening degree decreases, and to decrease the flow resistance of the refrigerant through the electronic expansion valve when its opening degree increases. Outdoor ambient temperature sensor, used to detect outdoor ambient temperature; An exhaust temperature sensor is used to detect the actual exhaust temperature of the compressor; The controller is configured to: When the air conditioner is turned on, the outdoor ambient temperature, the operating frequency of the compressor, the actual opening degree of the electronic expansion valve, the actual discharge temperature of the compressor, and the outdoor fan speed of the air conditioner are acquired. The target exhaust temperature of the compressor is determined based on the outdoor ambient temperature and the operating frequency of the compressor, and the difference between the target exhaust temperature and the actual exhaust temperature of the compressor is determined. The target opening degree of the electronic expansion valve is determined based on the outdoor ambient temperature, the operating frequency of the compressor, and the speed of the outdoor fan. When the absolute value of the first difference between the target opening degree of the electronic expansion valve and the actual opening degree of the electronic expansion valve reaches or exceeds a preset difference threshold, the opening degree of the electronic expansion valve is adjusted to the target opening degree, and after running for a first preset time, the operating state of the electronic expansion valve is controlled according to the difference.

2. The air conditioner according to claim 1, characterized in that, When determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan's speed setting, the controller is configured to: The corresponding temperature coefficient and frequency coefficient are determined based on the outdoor ambient temperature. Determine the corresponding opening compensation value based on the outdoor fan speed; The target opening of the electronic expansion valve is determined based on the outdoor ambient temperature, the compressor's operating frequency, the temperature coefficient, the frequency coefficient, and the opening compensation value.

3. The air conditioner according to claim 2, characterized in that, When determining the corresponding temperature coefficient and frequency coefficient based on the outdoor ambient temperature, the controller is configured as follows: The operating mode of the air conditioner is obtained, including a cooling operating mode and a heating operating mode; Determine the temperature zone corresponding to the outdoor ambient temperature under the operating mode; The mapping relationship between temperature zone, temperature coefficient, and frequency coefficient stored in the controller is queried to determine the temperature coefficient and the frequency coefficient.

4. The air conditioner according to claim 2, characterized in that, When determining the corresponding opening compensation value based on the outdoor fan speed, the controller is configured as follows: Based on the outdoor fan speed, the mapping relationship between the outdoor fan speed and the opening compensation value stored in the controller is queried to determine the opening compensation value.

5. The air conditioner according to claim 2, characterized in that, Before determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature and the operating frequency of the compressor, the controller is further configured to: After the electronic expansion valve is controlled to operate at a preset initial opening for a second preset time, the operating state of the electronic expansion valve is controlled according to the difference.

6. The air conditioner according to claim 5, characterized in that, When controlling the operating state of the electronic expansion valve based on the difference, the controller is configured to: When the difference is greater than zero, the opening of the electronic expansion valve is reduced. When the difference is equal to zero, the opening of the electronic expansion valve remains unchanged. When the difference is less than zero, the opening of the electronic expansion valve is increased.

7. The air conditioner according to claim 5, characterized in that, After adjusting the opening of the electronic expansion valve to the target opening and continuing to operate for a first preset time, the controller is configured to: Using a third preset time as the adjustment cycle, the operating state of the electronic expansion valve is controlled according to the difference, and after a preset number of adjustment cycles, the absolute value of the second difference between the target opening degree of the electronic expansion valve and the actual opening degree of the electronic expansion valve is re-determined. The operating state of the electronic expansion valve is controlled based on the absolute value of the second difference.

8. The air conditioner according to claim 7, characterized in that, When controlling the operating state of the electronic expansion valve based on the absolute value of the second difference, the controller is configured to: When the absolute value of the second difference reaches or exceeds the preset difference threshold, the electronic expansion valve is controlled to stop adjusting the opening, and the target opening of the electronic expansion valve after being re-determined is corrected based on the absolute value of the second difference, so as to obtain the corrected target opening of the electronic expansion valve. The operating state of the electronic expansion valve is controlled based on the target opening degree of the modified electronic expansion valve.

9. The air conditioner according to claim 7, characterized in that, When correcting the target opening of the redefined electronic expansion valve based on the absolute value of the second difference, the controller is configured to: Obtain the sum of the absolute value of the second difference and the opening compensation value, and use the sum as the new opening compensation value; The target opening of the electronic expansion valve is determined based on the outdoor ambient temperature, the compressor's operating frequency, the outdoor fan speed, and the new opening compensation value.

10. The air conditioner according to claim 1, characterized in that, After determining the target opening degree of the electronic expansion valve based on the outdoor ambient temperature, the compressor's operating frequency, and the outdoor fan speed, the controller is further configured to: When the absolute value of the first difference between the target opening degree and the actual opening degree of the electronic expansion valve does not reach the preset difference threshold, the electronic expansion valve is controlled to maintain the actual opening degree.

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