Air conditioner and control method therefor, and computer-readable storage medium

Abstract

Provided in the present disclosure are an air conditioner and a control method therefor, and a computer-readable storage medium. The air conditioner comprises a compressor, a reversing apparatus, an outdoor heat exchanger, an electronic expansion valve, a coolant ring, a variable-flow throttling valve and an indoor heat exchanger, which are sequentially connected, wherein the variable-flow throttling valve is configured to automatically adjust the coolant flow when the air conditioner runs in a cooling mode, so as to be adapted to a load change; and the electronic expansion valve is configured to perform opening-degree increase adjustment when the air conditioner runs in a non-reversing defrosting mode, and the opening degree stagewise changes.

Description

Air conditioner, control method thereof and computer-readable storage medium

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 202410149838.0, filed on February 1, 2024, entitled "Air Conditioner and Control Method Thereof and Computer-Readable Storage Medium", and to Chinese Patent Application No. 202420259478.5, filed on February 1, 2024, entitled "Air Conditioner", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of air conditioner technology, and in particular to an air conditioner, an air conditioner control method, and a computer-readable storage medium. Background Technology

[0004] Currently, when an air conditioner is in heating mode during winter, the outdoor heat exchanger continuously absorbs heat from the environment and maintains a relatively low temperature. When the outdoor ambient temperature is low, the temperature of the heat exchanger may drop below 0 degrees Celsius. At this time, the heat exchanger will gradually frost over. Once the frost layer accumulates to a certain thickness, it will seriously affect the heating effect of the air conditioner. Therefore, the air conditioner needs to be defrosted frequently.

[0005] Currently, related technologies primarily employ reverse defrosting, requiring a switch to cooling mode during heating to defrost. This stops the air conditioner's heating, causing significant fluctuations in indoor temperature. Additionally, the switching of the four-way valve produces a clicking sound, negatively impacting the user's heating experience. Furthermore, existing electronic valve flow paths cannot simultaneously accommodate the needs of normal system operation and reverse defrosting, and throttling elements (such as capillary tubes) cannot accommodate the varying flow rates required by high and low system loads. While some existing technologies use electronic expansion valves in the refrigerant flow path to replace capillary tubes for throttling, this method increases system costs, although it can accommodate different flow rates during cooling operation. Moreover, existing electronic expansion valves typically have a fixed lower opening limit to prevent condensation from forming when the refrigerant flows through the refrigerant loop after excessive throttling, which could lead to electrical short circuits. This neglects environmental factors and carries the risk of electrical short circuits or even burnout.

[0006] Public content

[0007] This disclosure aims to at least partially address one of the technical problems in the related art. To this end, a first objective of this disclosure is to provide an air conditioner in which a variable flow throttling valve is configured to automatically adjust the refrigerant flow during cooling operation to adapt to load changes; and an electronic expansion valve is configured to increase its opening degree in a staged manner during non-reversing defrosting operation, thereby achieving non-reversing defrosting at low cost and reducing the risk of short-circuit burnout in the electronic control system. This ensures heating performance when refrigerant flow is low, maintains throttling performance under low load, guarantees reliable compressor oil return, and ensures sufficient flow under high load to guarantee cooling performance.

[0008] The second objective of this disclosure is to provide a control method for an air conditioner.

[0009] A third objective of this disclosure is to provide a computer-readable storage medium.

[0010] To achieve the above objectives, a first aspect of this disclosure provides an air conditioner, comprising: a compressor, a reversing device, an outdoor heat exchanger, an electronic expansion valve, a refrigerant loop, a variable flow throttle valve, and an indoor heat exchanger connected in sequence. The variable flow throttle valve is configured to automatically adjust the refrigerant flow rate to adapt to load changes during cooling operation of the air conditioner. The electronic expansion valve is configured to increase its opening degree during defrosting operation of the air conditioner without reversing, and the opening degree changes in stages.

[0011] According to an embodiment of the air conditioner disclosed herein, a variable flow throttling valve is configured to automatically adjust the refrigerant flow rate during cooling operation to adapt to load changes; an electronic expansion valve is configured to increase its opening degree during non-reversing defrosting operation, with the opening degree changing in stages. Therefore, this air conditioner can achieve non-reversing defrosting at low cost, reduce the risk of short circuits and burnout in the electrical control system, ensure heating performance when refrigerant flow is low, ensure throttling effect and reliable compressor oil return during low load, and ensure sufficient flow and cooling performance during high load.

[0012] In addition, the air conditioner according to the above embodiments of this disclosure may also have the following additional technical features:

[0013] According to one embodiment of this disclosure, the air conditioner further includes a controller configured to, when the air conditioner is in cooling operation, determine a lower limit opening of the electronic expansion valve based on the outdoor ambient temperature, and limit the opening of the electronic expansion valve based on the lower limit opening.

[0014] According to one embodiment of this disclosure, the controller is further configured to: set a first opening value to the lower limit opening when the outdoor ambient temperature is less than or equal to a first preset outdoor temperature; determine the lower limit opening according to a preset linear relationship when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to a second preset outdoor temperature; and set a second opening value to the lower limit opening when the outdoor ambient temperature is greater than the second preset outdoor temperature; wherein the preset linear relationship is a linear function with the outdoor ambient temperature as the variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value.

[0015] According to one embodiment of this disclosure, the controller is further configured to, when the air conditioner is not reversing defrosting operation, acquire the current opening degree of the electronic expansion valve, and adjust the opening degree of the electronic expansion valve multiple times according to the current opening degree, so that the opening degree of the electronic expansion valve changes in stages.

[0016] According to one embodiment of this disclosure, the controller is further configured to determine a target opening degree and a number of opening degree adjustments for the electronic expansion valve, determine an adjustment step size based on the current opening degree, the target opening degree, and the number of opening degree adjustments, and perform multiple increases in the opening degree of the electronic expansion valve based on the adjustment step size.

[0017] According to one embodiment of this disclosure, the air conditioner further includes a controller, which is further configured to acquire at least one of an indoor ambient temperature, an outdoor ambient temperature, and an outdoor heat exchanger temperature, and determine that the air conditioner is in non-reversing defrosting operation based on at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature.

[0018] According to one embodiment of this disclosure, the controller controls the air conditioner to not switch to defrosting mode if any of the following conditions are not met: (1) the indoor ambient temperature is less than a first preset temperature, or the outdoor ambient temperature is less than a second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than a third preset temperature; (2) the change in the outdoor heat exchanger temperature is less than a fourth preset temperature; (3) the outdoor ambient temperature is less than a fifth preset temperature and the air conditioner has not entered defrosting mode within a second preset time, wherein the fifth preset temperature is greater than the second preset temperature.

[0019] According to one embodiment of this disclosure, the controller is further configured to acquire a first temperature change value of the outdoor heat exchanger and a second temperature change value of the outdoor ambient temperature within a third preset time period; and determine the temperature change value of the outdoor heat exchanger based on the relationship between the first temperature change value and the second temperature change value.

[0020] According to one embodiment of this disclosure, the controller is further configured to, when the change value of the outdoor heat exchanger temperature is less than a sixth preset temperature, control the air conditioner to enter a first non-reversing defrosting mode; and when the change value of the outdoor heat exchanger temperature is less than a seventh preset temperature, control the air conditioner to enter a second non-reversing defrosting mode; wherein the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

[0021] According to one embodiment of this disclosure, the controller is further configured to, when the air conditioner is running in the first non-reversing defrosting mode, wherein, if no change in the opening degree of the electronic expansion valve is detected, the controller controls the air conditioner to exit the first non-reversing defrosting mode if the outdoor heat exchanger temperature is greater than an eighth preset temperature or the running time of the first non-reversing defrosting mode is greater than a third preset time; if a change in the opening degree of the electronic expansion valve is detected, the controller determines whether to exit the first non-reversing defrosting mode based on the outdoor heat exchanger temperature after a fourth preset time delay.

[0022] According to one embodiment of this disclosure, the controller is further configured to, when the air conditioner is operating in the second non-reversing defrosting mode, wherein, if no change in the opening degree of the electronic expansion valve is detected, the controller controls the air conditioner to exit the second non-reversing defrosting mode if the outdoor heat exchanger temperature is greater than a ninth preset temperature or the operating time of the second non-reversing defrosting mode is greater than a fifth preset time; if a change in the opening degree of the electronic expansion valve is detected, the controller determines whether the air conditioner should exit the second non-reversing defrosting mode based on the outdoor heat exchanger temperature after a sixth preset time; wherein, the ninth preset temperature is greater than an eighth preset temperature, and the fifth preset time is greater than the third preset time.

[0023] According to one embodiment of this disclosure, the controller is further configured to, when the air conditioner enters the first non-reversing defrosting mode, control the compressor to operate at a first operating frequency, stop the outdoor fan, and keep the speed of the indoor fan unchanged; when the air conditioner enters the second non-reversing defrosting mode, control the compressor to operate at a second operating frequency, stop the outdoor fan, and reduce the speed of the indoor fan at a preset rate; wherein, the first operating frequency is less than the second operating frequency.

[0024] According to one embodiment of this disclosure, the electronic expansion valve is a wide-range variable gain electronic expansion valve.

[0025] According to one embodiment of this disclosure, the wide-range variable gain electronic expansion valve is further configured to change its opening degree based on the load change when the air conditioner is operating in heating mode.

[0026] According to one embodiment of this disclosure, the wide-range variable gain electronic expansion valve includes a valve body with an inlet and an outlet. A valve seat is provided at the outlet, and a valve needle is provided on the valve seat. The gap between the valve needle and the valve seat forms a throttling orifice, and the valve needle adjustment section is designed with multiple angles.

[0027] According to one embodiment of this disclosure, the diameter of the valve seat ranges from 1.6 mm to 3.2 mm.

[0028] According to one embodiment of this disclosure, the variable flow throttle valve includes: a housing, wherein an installation channel is formed within the housing, the housing having a first medium flow port and a second medium flow port, the installation channel connecting the first medium flow port and the second medium flow port; a first valve seat, the first valve seat being installed within the installation channel, the first valve seat having an adjacent first hole and a first medium flow channel, the first medium flow channel connecting the first medium flow port and the first hole, the first hole being adapted to connect the first medium flow channel and the second medium flow port; the first valve seat also having an adjacent second hole and a second medium flow channel, the second medium flow channel connecting the second medium flow port and the second hole, the second hole being adapted to connect the first medium flow port and the second medium flow channel; a first valve core, the first valve core being disposed within the first medium flow channel, the first valve core being movable along the first medium flow channel to open or close the first hole; and a second valve core, the second valve core being disposed within the second medium flow channel, the second valve core being movable along the second medium flow channel to open or close the second hole.

[0029] According to one embodiment of this disclosure, when a medium flows into the installation channel through the first medium flow port, the medium drives the first valve core to move and close the first hole and drives the second valve core to move and open the second hole; when a medium flows into the installation channel through the second medium flow port, the medium drives the first valve core to move and open the first hole and drives the second valve core to move and close the second hole; wherein, along the length direction of the installation channel, the first hole and the second hole are located between the first medium flow channel and the second medium flow channel.

[0030] According to one embodiment of this disclosure, a throttling channel and a connecting channel are further formed within the housing. The throttling channel connects the first medium flow port and the second hole, and the connecting channel connects the second medium flow port and the first hole. The throttling channel and / or the connecting channel are formed in the first valve seat.

[0031] According to one embodiment of this disclosure, a first connecting channel is formed between the first valve seat and the housing, the first connecting channel connecting the throttling channel and the first medium flow port; a second connecting channel is formed between the first valve seat and the housing, the second connecting channel connecting the conducting channel and the second medium flow port.

[0032] According to one embodiment of this disclosure, a first limiting member is provided in the first medium flow channel. The first limiting member is located on the side of the first valve core opposite to the first hole. The first limiting member forms a third connecting flow channel connecting the first medium flow channel and the first medium flow port. The first limiting member is adapted to limit and cooperate with the first valve core. A second limiting member is provided in the second medium flow channel. The second limiting member is located on the side of the second valve core opposite to the second hole. The second limiting member forms a fourth connecting flow channel connecting the second medium flow channel and the second medium flow port. The second limiting member is adapted to limit and cooperate with the second valve core.

[0033] According to one embodiment of this disclosure, the variable flow throttle valve further includes: an elastic element, which is assembled in the second medium flow channel and located between the second valve core and the second limiting element, and the elastic element is connected between the second valve core and the second limiting element.

[0034] According to one embodiment of this disclosure, the second valve core includes: a valve core body connected together and a sealing post, the sealing post being used to open or close the second hole.

[0035] According to one embodiment of this disclosure, the valve core body is cylindrical, or the sidewall of the valve core body has at least one notch.

[0036] According to one embodiment of this disclosure, the variable flow throttle valve further includes: a first filter element, which is installed in the installation channel and located between the first valve seat and the first medium flow port; and a second filter element, which is installed in the installation channel and located between the first valve seat and the second medium flow port.

[0037] To achieve the above objectives, a second aspect of this disclosure provides a control method for an air conditioner, the air conditioner comprising: a compressor, a reversing device, an outdoor heat exchanger, an electronic expansion valve, a refrigerant loop, a variable flow throttle valve, and an indoor heat exchanger connected in sequence; the method comprising: determining the operating conditions of the air conditioner; when the air conditioner is in cooling operation, automatically adjusting the refrigerant flow based on the variable flow throttle valve to adapt to load changes; and when the air conditioner is in defrosting operation without reversing, adjusting the opening of the electronic expansion valve to increase the opening degree in a staged manner.

[0038] According to the air conditioner control method of this disclosure, the operating conditions of the air conditioner are determined. When the air conditioner is in cooling operation, the refrigerant flow is automatically adjusted based on a variable flow throttle valve to adapt to load changes. When the air conditioner is in non-reversing defrosting operation, the opening of the electronic expansion valve is increased, and the opening changes in stages. Therefore, this method can achieve non-reversing defrosting at low cost, reduce the risk of short circuits and burnout in the electronic control system, ensure the heating effect of the air conditioner when the refrigerant flow is low, ensure the throttling effect and guarantee the reliability of compressor oil return when the air conditioner is under low load, and ensure sufficient flow and cooling effect when the air conditioner is under high load.

[0039] In addition, the air conditioner according to the above embodiments of this disclosure may also have the following additional technical features:

[0040] According to one embodiment of this disclosure, determining the lower limit opening of the electronic expansion valve based on the outdoor ambient temperature includes: setting a first opening value as the lower limit opening when the outdoor ambient temperature is less than or equal to a first preset outdoor temperature; determining the lower limit opening according to a preset linear relationship when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to a second preset outdoor temperature; and setting a second opening value as the lower limit opening when the outdoor ambient temperature is greater than the second preset outdoor temperature. Wherein, the preset linear relationship is a linear function with the outdoor ambient temperature as the variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value.

[0041] According to one embodiment of this disclosure, adjusting the opening of the electronic expansion valve in a step-by-step manner includes: obtaining the current opening of the electronic expansion valve, and adjusting the opening of the electronic expansion valve multiple times based on the current opening, so that the opening of the electronic expansion valve changes in a step-by-step manner.

[0042] According to one embodiment of this disclosure, the opening of the electronic expansion valve is adjusted multiple times based on the current opening, including: determining the target opening and the number of opening adjustments of the electronic expansion valve, determining an adjustment step size based on the current opening, the target opening and the number of opening adjustments, and adjusting the opening of the electronic expansion valve multiple times based on the adjustment step size.

[0043] According to one embodiment of this disclosure, the control method for an air conditioner further includes: acquiring at least one of an indoor ambient temperature, an outdoor ambient temperature, and an outdoor heat exchanger temperature, and determining that the air conditioner is in non-reversing defrosting operation based on at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature.

[0044] According to one embodiment of this disclosure, the air conditioner is controlled to not switch to defrost mode if any of the following conditions are not met: (1) the indoor ambient temperature is less than a first preset temperature, or the outdoor ambient temperature is less than a second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than a third preset temperature; (2) the change in the outdoor heat exchanger temperature is less than a fourth preset temperature; (3) the outdoor ambient temperature is less than a fifth preset temperature and the air conditioner does not enter defrost mode within a second preset time, wherein the fifth preset temperature is greater than the second preset temperature.

[0045] According to one embodiment of this disclosure, the control method for an air conditioner further includes: acquiring a first temperature change value of the outdoor heat exchanger and a second temperature change value of the outdoor ambient temperature within a third preset time period; and determining the temperature change value of the outdoor heat exchanger based on the relationship between the first temperature change value and the second temperature change value.

[0046] According to one embodiment of this disclosure, the control method for an air conditioner further includes: controlling the air conditioner to enter a first non-reversing defrosting mode when the change value of the outdoor heat exchanger temperature is less than a sixth preset temperature; and controlling the air conditioner to enter a second non-reversing defrosting mode when the change value of the outdoor heat exchanger temperature is less than a seventh preset temperature; wherein the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

[0047] According to one embodiment of this disclosure, when the air conditioner is running in the first non-reversing defrosting mode, the method further includes: if no change in the opening degree of the electronic expansion valve is detected, then if the outdoor heat exchanger temperature is greater than an eighth preset temperature or the running time of the first non-reversing defrosting mode is greater than a third preset time, controlling the air conditioner to exit the first non-reversing defrosting mode; if a change in the opening degree of the electronic expansion valve is detected, then after a fourth preset time, determining whether the air conditioner has exited the first non-reversing defrosting mode based on the outdoor heat exchanger temperature.

[0048] According to one embodiment of this disclosure, when the air conditioner is running in the second non-reversing defrosting mode, the method further includes: if no change in the opening degree of the electronic expansion valve is detected, then if the outdoor heat exchanger temperature is greater than a ninth preset temperature or the running time of the second non-reversing defrosting mode is greater than a fifth preset time, controlling the air conditioner to exit the second non-reversing defrosting mode; if a change in the opening degree of the electronic expansion valve is detected, then after a sixth preset time, determining whether the air conditioner has exited the second non-reversing defrosting mode based on the outdoor heat exchanger temperature; wherein, the ninth preset temperature is greater than an eighth preset temperature, and the fifth preset time is greater than the third preset time.

[0049] According to one embodiment of this disclosure, the control method for the air conditioner further includes: when the air conditioner enters the first non-reversing defrosting mode, controlling the compressor to operate at a first operating frequency, stopping the outdoor fan, and keeping the speed of the indoor fan unchanged; when the air conditioner enters the second non-reversing defrosting mode, controlling the compressor to operate at a second operating frequency, stopping the outdoor fan, and reducing the speed of the indoor fan at a preset rate; wherein the first operating frequency is less than the second operating frequency.

[0050] To achieve the above objectives, a third aspect of this disclosure provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described air conditioner control method.

[0051] According to the computer-readable storage medium of the present disclosure, by implementing the above-described air conditioner control method during execution, it is possible to achieve non-reversing defrosting at low cost and reduce the risk of short circuit burnout of the electronic control unit. It can ensure the heating effect of the air conditioner when the refrigerant flow is low, ensure the throttling effect when the air conditioner is under low load, ensure the reliability of compressor oil return, ensure sufficient flow when the air conditioner is under high load, and ensure the cooling effect of the air conditioner.

[0052] Additional aspects and advantages of this disclosure 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 this disclosure. Attached Figure Description

[0053] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0054] Figure 1 is a system schematic diagram of an air conditioner according to an embodiment of the present disclosure;

[0055] Figure 2 is a block diagram of an air conditioner in the prior art;

[0056] Figure 3 is a block diagram of an air conditioner in the prior art;

[0057] Figure 4 is a schematic diagram of a variable flow throttle valve according to an embodiment of the present disclosure;

[0058] Figure 5 is a schematic diagram of an electronic expansion valve according to an embodiment of the present disclosure;

[0059] Figure 6 is a schematic diagram of an electronic expansion valve according to another embodiment of the present disclosure;

[0060] Figure 7 is a schematic diagram of the structure of a variable flow throttle valve according to an embodiment of the present disclosure;

[0061] Figure 8 is a flowchart of a control method for an air conditioner according to an embodiment of the present disclosure;

[0062] Figure 9 is a flowchart of a control method for an air conditioner according to a specific example of the present disclosure. Detailed Implementation

[0063] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0064] As shown in Figure 2, currently, in air conditioning systems, an electronic expansion valve and a capillary tube are installed between the evaporator and condenser. When the air conditioner is running in cooling mode, the refrigerant passing through the evaporator can be throttled through the capillary tube. However, this capillary throttling method cannot simultaneously meet the different flow requirements of the system under high and low loads. Furthermore, as shown in Figure 3, to meet the different flow requirements of the system under high and low loads, an electronic expansion valve is installed between the outdoor heat exchanger and the indoor heat exchanger. By adjusting the opening of the electronic expansion valve, the refrigerant flow rate in the refrigerant circuit can be adjusted. While this method can meet the different flow requirements of the system under high and low loads, it increases the system cost. Therefore, this disclosure proposes an air conditioner that reduces costs by incorporating a variable flow throttling valve and can automatically adjust the refrigerant flow rate to adapt to load changes.

[0065] The following description, with reference to the accompanying drawings, describes an air conditioner, an air conditioner control method, and a computer-readable storage medium according to embodiments of the present disclosure.

[0066] Figure 1 is a schematic diagram of an air conditioner system according to an embodiment of the present disclosure.

[0067] As shown in Figure 1, the air conditioner 100 of this disclosure may include a compressor 70, a reversing device 60, an outdoor heat exchanger 20, an electronic expansion valve 40, a refrigerant ring 50, a variable flow throttle valve 30, and an indoor heat exchanger 10 connected in sequence.

[0068] The variable flow throttle valve 30 is configured to automatically adjust the refrigerant flow when the air conditioner 100 is in cooling operation to adapt to load changes. The electronic expansion valve 40 is configured to increase its opening degree when the air conditioner 100 is not in defrosting operation, and the opening degree changes in stages.

[0069] Specifically, referring to Figure 1, the variable flow throttling valve 30 is positioned on the left side of the refrigerant ring 50, and the electronic expansion valve 40 is positioned on the right side of the refrigerant ring 50. This allows the refrigerant to first pass through the electronic expansion valve 40, then through the refrigerant ring 50, and finally flow to the variable flow throttling valve 30 for throttling during the cooling process of the air conditioner 100. After the refrigerant flows through the electronic expansion valve 40, it is necessary to ensure that the refrigerant temperature entering the refrigerant ring 50 in the electronic control system is not too low. If the temperature is too low, condensation below the dew point of the air could occur, potentially causing a short circuit in the electronic control system. The refrigerant ring 50 is used to dissipate heat from the electronic control system, improving its reliability. Furthermore, referring to Figure 4, when the air conditioner 100 is operating in cooling mode, the refrigerant flows in through the variable flow throttling valve 30 in the F direction and flows out through the C direction, with a wide flow adjustment range. This allows the air conditioner 100 to achieve the required throttling effect under different operating conditions and frequencies, automatically adjusting the refrigerant flow to adapt to load changes during cooling operation. When the air conditioner 100 is running in heating mode, more heat is usually needed to transfer to the indoor space. The refrigerant flows in through the C direction and flows out through the F direction of the variable flow throttle valve 30, and does not have a throttling effect, thereby improving the heating effect of the air conditioner 100.

[0070] More specifically, when the air conditioner 100 is operating in cooling mode, the variable flow throttle valve 30 can regulate the refrigerant flow. For example, referring to Figure 1, when the air conditioner 100 is operating in cooling mode, the refrigerant can flow from the compressor 70 to the outdoor heat exchanger 20 after being switched by the four-way valve 60. The high-temperature, high-pressure gaseous refrigerant releases heat in the outdoor heat exchanger 20, and condenses into a liquid state by interacting with the outdoor ambient air. The high-temperature, high-pressure liquid refrigerant first passes through the electronic expansion valve 40, which reduces the temperature and pressure of the refrigerant, and then flows to the outdoor heat exchanger 20. The refrigerant ring 50 provides heat dissipation for the electronic control components, and then flows to the variable flow throttle valve 30. This valve automatically adjusts its flow rate according to the refrigerant pressure. For example, when the refrigerant pressure is low, the flow rate can be reduced to ensure throttling and maintain the reliability of oil return from the compressor 70. When the refrigerant pressure is high, the flow rate can be increased to improve the cooling effect of the air conditioner 100. Specifically, when the refrigerant flows to the indoor heat exchanger 10, it absorbs heat from the indoor air, causing a phase change from liquid to gas and lowering the indoor temperature. The gaseous refrigerant then returns to the compressor 70 after passing through the four-way valve 60 to perform work and compression, increasing its pressure and temperature, becoming a high-temperature, high-pressure gaseous refrigerant. The indoor heat exchanger 10 can be an evaporator, and the outdoor heat exchanger 20 can be a condenser. When the air conditioner 100 is running in cooling mode, the flow rate of the refrigerant can be adjusted by using a variable flow throttle valve 30 instead of an electronic expansion valve, which can reduce costs. Using a variable flow throttle valve 30 instead of a capillary tube can achieve automatic adjustment of the refrigerant flow rate.

[0071] When the air conditioner 100 is operating in heating mode, the refrigerant flows from the compressor 70 to the indoor heat exchanger 10 after being switched by the four-way valve 60. The high-temperature and high-pressure gaseous refrigerant releases heat in the indoor heat exchanger 10. By contacting the indoor air, the refrigerant is cooled and condensed into a liquid, releasing heat to raise the indoor temperature. Then it flows to the variable flow throttle valve 30. When the air conditioner 100 is heating, the variable flow throttle valve 30 does not throttle. After passing through the refrigerant ring 50, it flows to the electronic expansion valve 40 to reduce the refrigerant pressure. The electronic expansion valve 40 can also reduce the refrigerant flow rate. By reducing the refrigerant flow rate, the residence time of the refrigerant in the outdoor heat exchanger 20 can be increased, so that more heat can be absorbed and transferred to the refrigerant, thereby improving the heating effect. It can also prevent the refrigerant in the indoor heat exchanger 10 from overheating, thus avoiding a decrease in the heating effect. The low-temperature, low-pressure gaseous refrigerant absorbs heat from the air in the outdoor heat exchanger 20, causing the refrigerant to undergo a phase change from gaseous to liquid. After passing through the four-way valve 60, it returns to the compressor 70 to perform work and compression, increasing its pressure and temperature, and becoming a high-temperature, high-pressure gaseous refrigerant.

[0072] When the outdoor ambient temperature is low, the temperature of the outdoor heat exchanger 20 may drop below 0 degrees Celsius. At this time, the outdoor heat exchanger 20 will gradually frost over. Once the frost layer accumulates to a certain thickness, it will severely affect the heating effect of the air conditioner 100. Therefore, when the air conditioner 100 is running in non-reversing defrosting mode, the opening of the electronic expansion valve 40 can be increased to allow for a larger refrigerant flow in the pipes, ensuring a good defrosting effect during non-reversing defrosting. That is, by increasing the refrigerant flow through the electronic expansion valve 40, a large flow of refrigerant is ensured to flow to the outdoor heat exchanger 20, using the sensible heat of the high-temperature refrigerant to treat the frost layer on the surface of the outdoor heat exchanger 20. Furthermore, during the adjustment of the opening degree of the electronic expansion valve 40, the opening degree changes in stages. This means that when the air conditioner 100 is not reversing for defrosting, the electronic expansion valve 40 needs to be opened wider to increase the flow rate, resulting in a relatively large opening range. If the opening degree changes too quickly, it will cause refrigerant noise; if the opening degree changes too slowly, it will affect the defrosting effect. Therefore, making the opening degree change in stages can reduce refrigerant noise and other problems, and improve the defrosting effect. The indoor heat exchanger 10 can be a condenser, and the outdoor heat exchanger 20 can be an evaporator.

[0073] Therefore, when the air conditioner is running in cooling mode, the variable flow throttling valve is configured to automatically adjust the refrigerant flow to adapt to load changes. The electronic expansion valve is configured to increase its opening degree in stages when the air conditioner is not reversing during defrosting. This enables low-cost non-reversing defrosting, reduces the risk of short circuits and burnout in the electrical control system, ensures heating performance when refrigerant flow is low, ensures throttling effect and reliable compressor oil return when the air conditioner is under low load, and ensures sufficient flow and cooling performance when the air conditioner is under high load.

[0074] According to one embodiment of the present disclosure, as shown in FIG1, the air conditioner 100 further includes a controller 80 (not shown in the figure), which is configured to determine the lower limit opening degree of the electronic expansion valve 40 based on the outdoor ambient temperature when the air conditioner 100 is in cooling operation, and to limit the opening degree of the electronic expansion valve 40 based on the lower limit opening degree.

[0075] Specifically, when the air conditioner 100 is running in cooling mode, the controller 80 can determine the lower limit opening of the electronic expansion valve 40 based on the outdoor ambient temperature. For example, the controller can control the electronic expansion valve 40 based on the outdoor ambient temperature to limit its opening. The outdoor ambient temperature can be obtained through an outdoor temperature sensor. Different outdoor ambient temperatures result in different opening sizes for the electronic expansion valve 40. For example, the higher the outdoor ambient temperature, the larger the lower limit opening of the electronic expansion valve 40; the lower the outdoor ambient temperature, the smaller the lower limit opening of the electronic expansion valve 40. This prevents the pipe temperature in the refrigerant loop from falling below the dew point temperature of the surrounding environment, which could cause condensation in the refrigerant loop, leading to a short circuit, burn out the electronic control unit, or even damage the entire unit. Furthermore, the opening size is set more reasonably, ensuring reliability while fully utilizing the cooling capacity.

[0076] In addition, the electronic expansion valve 40 can be controlled according to the temperature range of the outdoor ambient temperature to limit its opening. For example, the outdoor ambient temperature can be obtained by an outdoor temperature sensor, and the temperature range of the outdoor ambient temperature can be determined. Different temperature ranges result in different opening sizes for the electronic expansion valve 40. For example, in a temperature range with higher outdoor ambient temperatures, the lower limit opening of the electronic expansion valve 40 is larger, and in a temperature range with lower outdoor ambient temperatures, the lower limit opening of the electronic expansion valve 40 is smaller. This prevents the pipe temperature in the refrigerant loop from falling below the dew point temperature of the surrounding environment, which would cause condensation in the refrigerant loop, leading to short circuits, burnout of the electronic control unit, or even the entire unit. Furthermore, the opening size setting is more reasonable, ensuring reliability while fully utilizing the cooling capacity.

[0077] According to one embodiment of this disclosure, the controller 80 is further configured to: set a first opening value to a lower limit opening when the outdoor ambient temperature is less than or equal to a first preset outdoor temperature; determine a lower limit opening according to a preset linear relationship when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to a second preset outdoor temperature; and set a second opening value to a lower limit opening when the outdoor ambient temperature is greater than the second preset outdoor temperature. The preset linear relationship is a linear function with the outdoor ambient temperature as the variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value. The first and second preset outdoor temperatures can be determined according to actual conditions, and the first and second opening values ​​can be determined according to actual conditions.

[0078] Specifically, when the air conditioner 100 is running in cooling mode, the current electronic expansion valve is typically set to a fixed lower limit opening to prevent condensation from forming when the refrigerant flows through the refrigerant ring 50 after excessive throttling, which could cause a short circuit in the electronic control system. However, the actual dew point temperature varies with the outdoor ambient temperature. Therefore, a more reasonable lower limit opening needs to be set for different ambient temperatures to ensure reliability while fully utilizing the refrigeration system's regulating capabilities. Thus, the purpose of controlling the lower limit opening of the electronic expansion valve 40 during air conditioner cooling mode is to prevent condensation from forming on the refrigerant ring 50 structure during cooling, which could lead to a short circuit and burnout of the electronic control system. If the refrigerant is excessively throttled through the electronic expansion valve 40, the pipe temperature in the refrigerant ring 50 will be lower than the corresponding dew point temperature of its surrounding environment. In this case, condensation will form in the refrigerant ring 50. Since the refrigerant ring 50 is in direct contact with the electronic control board, the condensation can come into contact with the components inside the electronic control board, causing a short circuit and potentially burning out the electronic control system or even the entire unit, posing a significant safety hazard.

[0079] The outdoor ambient temperature is determined. When the outdoor ambient temperature is less than or equal to the first preset outdoor temperature, for example, the first preset outdoor temperature can be set to 20 degrees Celsius. The outdoor ambient temperature can be obtained through a temperature sensor. For example, when the obtained outdoor ambient temperature is 15 degrees Celsius, the first opening value can be set as the lower limit opening of the electronic expansion valve 40. For example, the opening value of 370 pulses can be used as the lower limit opening of the electronic expansion valve 40.

[0080] The outdoor ambient temperature is determined. When the outdoor ambient temperature is greater than a first preset outdoor temperature and less than or equal to a second preset outdoor temperature (e.g., the first preset outdoor temperature can be set to 20 degrees Celsius and the second preset outdoor temperature can be set to 40 degrees Celsius), and the obtained outdoor ambient temperature is 30 degrees Celsius, the lower limit opening of the electronic expansion valve 40 can be determined according to a preset linear relationship. That is, the preset linear relationship is a linear function of the outdoor ambient temperature as a variable. One outdoor ambient temperature corresponds to one lower limit opening of the electronic expansion valve 40. After determining the outdoor ambient temperature, the lower limit opening of the electronic expansion valve 40 can be obtained according to the preset linear relationship, and the first opening value is less than the minimum value of the preset linear relationship. For example, the preset linear relationship can be Lrmin = a * T4 + b, where a can be 2.5, b can be 320, T4 is the outdoor ambient temperature, and Lrmin is the lower limit opening of the electronic expansion valve 40. Therefore, after determining the outdoor ambient temperature T4, the lower limit opening of the electronic expansion valve 40 can be determined according to the preset linear relationship.

[0081] The outdoor ambient temperature is determined. If the outdoor ambient temperature is greater than the second preset outdoor temperature, for example, when the acquired outdoor ambient temperature is 50 degrees Celsius, which is greater than the second preset outdoor temperature of 40 degrees Celsius, the second opening value can be set as the lower limit opening of the electronic expansion valve 40. For example, an opening of 420 pulses can be used as the lower limit opening of the electronic expansion valve 40. In addition, the maximum value of the preset linear relationship is less than the second opening value.

[0082] According to one embodiment of this disclosure, the controller 80 is further configured to acquire the current opening degree of the electronic expansion valve 40 when the air conditioner 100 is not in reversing defrosting operation, and to adjust the opening degree of the electronic expansion valve 40 multiple times according to the current opening degree so that the opening degree of the electronic expansion valve 40 changes in stages.

[0083] Specifically, when the air conditioner 100 operates in non-reversing defrosting mode, the electronic expansion valve 40 needs to be opened wider to increase airflow. However, the opening range is relatively large. If the opening changes too quickly, it can cause refrigerant noise; if it changes too slowly, it will affect the defrosting effect. Therefore, when the air conditioner 100 operates in non-reversing defrosting mode, the controller 80 can obtain the current opening of the electronic expansion valve 40. After obtaining the current opening of the electronic expansion valve 40, the opening can be adjusted multiple times based on the current opening. For example, the opening can be increased by a preset value each time, so that the opening of the electronic expansion valve 40 changes in stages, thereby reducing problems such as refrigerant noise.

[0084] According to one embodiment of the present disclosure, the controller 80 is further configured to determine the target opening degree and the number of opening degree adjustments of the electronic expansion valve 40, determine an adjustment step size based on the current opening degree, the target opening degree and the number of opening degree adjustments, and perform multiple increases in the opening degree of the electronic expansion valve 40 based on the adjustment step size.

[0085] Specifically, when the air conditioner 100 operates in non-reversing defrosting mode, the electronic expansion valve 40 needs to be opened wider to increase airflow. Since the opening range is relatively large, if the opening changes too quickly, it will cause refrigerant noise; if it changes too slowly, it will affect the defrosting effect. Therefore, when the air conditioner 100 operates in non-reversing defrosting mode, the controller 80 can obtain the current opening of the electronic expansion valve 40. After obtaining the current opening of the electronic expansion valve 40, the target opening and the number of opening adjustments can be determined first. After determining the target opening and the number of opening adjustments, the adjustment step size can be determined based on the current opening, the target opening, and the number of opening adjustments. For example, the adjustable opening Lr of the electronic expansion valve 40 can be calculated using the formula Lr = (Lraim - Lrx) / N, where Lr is the adjustable opening of the electronic expansion valve 40, Lraim is the target opening, Lrx is the current opening, and N is the number of opening adjustments, which can be 6.

[0086] Therefore, after determining the adjustment step size of the electronic expansion valve 40 based on the current opening degree, the target opening degree, and the number of adjustment cycles, the opening degree of the electronic expansion valve 40 can be adjusted multiple times according to the adjustment step size. That is, when increasing the opening degree of the electronic expansion valve 40, the opening degree can change by a maximum of Lr each time within a preset time period, such as 5 seconds, and this can be repeated multiple times until the target opening degree is reached. The target opening degree can be determined based on the heat required for defrosting. Therefore, repeatedly increasing the opening degree can reduce problems such as refrigerant noise.

[0087] According to one embodiment of the present disclosure, the air conditioner 100 further includes a controller 80, which is further configured to acquire at least one of an indoor ambient temperature, an outdoor ambient temperature, and an outdoor heat exchanger temperature, and determine that the air conditioner 100 is in non-reversing defrosting operation based on at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature.

[0088] Furthermore, according to one embodiment of this disclosure, the controller 80 controls the air conditioner 100 to not switch to defrosting operation if any of the following conditions are not met: (1) the indoor ambient temperature is lower than a first preset temperature, or the outdoor ambient temperature is lower than a second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is lower than a third preset temperature; (2) the change in temperature of the outdoor heat exchanger 20 is less than a fourth preset temperature; (3) the outdoor ambient temperature is lower than a fifth preset temperature and the air conditioner 100 has not entered defrosting mode within a second preset time, wherein the fifth preset temperature is greater than the second preset temperature. The first, second, third, fourth, and fifth preset temperatures can be determined according to actual conditions.

[0089] Specifically, when determining whether the air conditioner 100 has entered the non-reversing defrosting mode, the following preset conditions can be used for judgment: The outdoor ambient temperature is compared with a first preset temperature, the indoor ambient temperature is compared with a second preset temperature, and the sum of the indoor and outdoor ambient temperatures is compared with a third preset temperature. If the indoor ambient temperature is lower than the first preset temperature, or the outdoor ambient temperature is lower than the second preset temperature, or the sum of the indoor and outdoor ambient temperatures is lower than the third preset temperature, then the first judgment condition can be determined to be met.

[0090] The temperature change of the outdoor heat exchanger 20 is compared with the fourth preset temperature. When the temperature change of the outdoor heat exchanger 20 is less than the fourth preset temperature, the second judgment condition can be determined to be met. The temperature change of the outdoor heat exchanger 20 can be calculated based on the temperature change of the outdoor heat exchanger 20 over a period of time.

[0091] The outdoor ambient temperature is compared with the fifth preset temperature. When the outdoor ambient temperature is lower than the fifth preset temperature, it is also necessary to determine whether the air conditioner 100 enters the defrosting mode within the second preset time. When the outdoor ambient temperature is lower than the fifth preset temperature and the air conditioner 100 does not enter the defrosting mode within the second preset time, it can be determined that the third judgment condition is met.

[0092] Therefore, when the first, second, and third judgment conditions are not met, the controller 80 can control the air conditioner 100 to enter the non-reversing defrosting mode.

[0093] Furthermore, when the controller 80 determines that any of the preset conditions are met, it can control the four-way valve 60 to switch, causing the air conditioner 100 to enter the reversing defrosting mode. For example, when the indoor ambient temperature is lower than the first preset temperature, or the outdoor ambient temperature is lower than the second preset temperature, or the sum of the indoor and outdoor ambient temperatures is lower than the third preset temperature, the controller controls the four-way valve 60 to switch, causing the air conditioner 100 to enter the reversing defrosting mode. As another example, when the temperature change of the outdoor heat exchanger 20 is lower than the fourth preset temperature, the controller controls the four-way valve 60 to switch, causing the air conditioner 100 to enter the reversing defrosting mode. Alternatively, the controller can control the four-way valve 60 to switch, causing the air conditioner 100 to enter the reversing defrosting mode, when the outdoor ambient temperature is lower than the fifth preset temperature and the air conditioner has not entered defrosting mode within a second preset time.

[0094] When the air conditioner 100 enters the reversing defrosting mode, the controller 80 controls the compressor 70 to stop and then switches the direction of the four-way valve 60, and then restarts the compressor 70 to run in the defrosting mode, that is, in the cooling mode, to defrost the outdoor heat exchanger 20.

[0095] According to one embodiment of this disclosure, the controller 80 is further configured to acquire a first temperature change value of the outdoor heat exchanger 20 and a second temperature change value of the outdoor ambient temperature within a third preset time period; determine the temperature change value of the outdoor heat exchanger 20 based on the relationship between the first temperature change value and the second temperature change value, wherein the preset coefficient is determined by the magnitude of the second temperature change value. The third preset time period can be determined according to actual conditions.

[0096] Specifically, when determining the temperature change value of the outdoor heat exchanger 20, since changes in the outdoor ambient temperature affect the temperature change of the outdoor heat exchanger 20, the determined value of the temperature change value of the outdoor heat exchanger 20 is relatively small when the air conditioner 100 is running in non-reversing defrosting mode, so it needs to be corrected. That is, after the air conditioner 100 starts heating and the compressor 70 starts, within a third preset time period, the first temperature change value of the outdoor heat exchanger 20 and the second temperature change value of the outdoor ambient temperature are obtained. That is, at the beginning of the third preset time, the temperature of the outdoor heat exchanger 20 can be recorded as T30, and at the end of the third preset time, the temperature of the outdoor heat exchanger 20 can be recorded as T3, along with the corresponding outdoor ambient temperatures T40 and T4. Therefore, the temperature change value of the outdoor heat exchanger 20 can be determined based on the relationship between the first and second temperature change values. For example, the temperature change value of the outdoor heat exchanger 20 can be determined by the difference between the first and second temperature change values ​​multiplied by a preset coefficient. The temperature change of the outdoor heat exchanger 20 can be calculated using ΔT3=(T3-T30)-M*(T4-T40). Here, M is a preset coefficient, which can be set in segments based on the outdoor ambient temperature and the temperature change of the outdoor heat exchanger 20. For example, when |T4-T40|≥6℃, the value of M can be 1; when |T4-T40|<6℃, the value of M can be 0.9.

[0097] According to one embodiment of this disclosure, the controller 80 is further configured to control the air conditioner 100 to enter a first non-reversing defrosting mode when the temperature change of the outdoor heat exchanger 20 is less than a sixth preset temperature; and to control the air conditioner 100 to enter a second non-reversing defrosting mode when the temperature change of the outdoor heat exchanger 20 is less than a seventh preset temperature; wherein the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature. The sixth and seventh preset temperatures can be determined according to actual conditions.

[0098] Specifically, when controlling the air conditioner 100 to enter the non-reversing defrosting mode, the system can determine whether to enter the first non-reversing defrosting mode or the second reversing defrosting mode based on the temperature change of the outdoor heat exchanger 20. The temperature change of the outdoor heat exchanger 20 is compared with a sixth preset temperature. When the temperature change of the outdoor heat exchanger 20 is less than the sixth preset temperature, the air conditioner 100 can be controlled to enter the first non-reversing defrosting mode. When the temperature change of the outdoor heat exchanger 20 is less than a seventh preset temperature, the air conditioner 100 can be controlled to enter the second non-reversing defrosting mode. The seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

[0099] In other words, if the temperature change of the outdoor heat exchanger 20 is less than the sixth preset temperature, it indicates that the frost layer on the outdoor heat exchanger 20 is thin and the temperature change of the outdoor heat exchanger 20 is large. In this case, the first non-reversing defrosting mode can be entered to melt the frost layer on the outdoor heat exchanger 20. If the temperature change of the outdoor heat exchanger 20 is less than the seventh preset temperature, it indicates that the frost layer on the outdoor heat exchanger 20 is thick and the temperature change of the outdoor heat exchanger 20 is small. In this case, the second non-reversing defrosting mode can be entered to melt the frost layer on the outdoor heat exchanger 20.

[0100] According to one embodiment of this disclosure, the controller 80 is further configured to, when the air conditioner 100 is operating in a first non-reversing defrost mode, wherein if no change in the opening degree of the electronic expansion valve 40 is detected, the controller 80 controls the air conditioner 100 to exit the first non-reversing defrost mode if the outdoor heat exchanger 20 temperature is greater than an eighth preset temperature or the operating time of the first non-reversing defrost mode is greater than a third preset time; if a change in the opening degree of the electronic expansion valve 40 is detected, the controller determines whether the air conditioner 100 should exit the first non-reversing defrost mode based on the outdoor heat exchanger 20 temperature after a fourth preset time delay. The eighth preset temperature can be determined according to actual conditions, and the third and fourth preset times can be determined according to actual conditions.

[0101] Specifically, the controller determines the current defrosting mode of the air conditioner 100. When the air conditioner 100 is running in the first non-reversing defrosting mode, it checks the opening degree of the electronic expansion valve 40, the temperature of the outdoor heat exchanger 20 against the eighth preset temperature, and the running time of the first non-reversing defrosting mode. If the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the temperature of the outdoor heat exchanger 20 is greater than the eighth preset temperature, it indicates that the defrosting of the outdoor heat exchanger 20 is complete, and the air conditioner 100 can be controlled to exit the first non-reversing defrosting mode. Alternatively, if the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the running time of the first non-reversing defrosting mode is greater than the third preset time, it indicates that the defrosting of the outdoor heat exchanger 20 is complete, and the air conditioner 100 can be controlled to exit the first non-reversing defrosting mode.

[0102] The current defrosting mode of the air conditioner 100 is determined. When the air conditioner 100 is running in the first non-reversing defrosting mode, the opening degree of the electronic expansion valve 40 is checked. When the opening degree of the electronic expansion valve 40 changes, it indicates that the air conditioner is still defrosting the outdoor heat exchanger 20 by increasing the opening degree of the electronic expansion valve 40. To ensure the stability of the temperature change of the outdoor heat exchanger 20, a fourth preset time can be delayed, for example, the fourth preset time can be 30 seconds. Then, the air conditioner 100 is checked to determine whether to exit the first non-reversing defrosting mode based on the temperature of the outdoor heat exchanger 20. That is, if the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the temperature of the outdoor heat exchanger 20 is greater than the eighth preset temperature or the running time of the first non-reversing defrosting mode is greater than the third preset time, the air conditioner 100 is controlled to exit the first non-reversing defrosting mode.

[0103] According to one embodiment of this disclosure, the controller 80 is further configured to, when the air conditioner 100 is operating in a second non-reversing defrost mode, wherein if no change in the opening degree of the electronic expansion valve 40 is detected, the air conditioner 100 is controlled to exit the second non-reversing defrost mode if the outdoor heat exchanger 20 temperature is greater than a ninth preset temperature or the operating time of the second non-reversing defrost mode is greater than a fifth preset time; if a change in the opening degree of the electronic expansion valve 40 is detected, the air conditioner 100 is determined to exit the second non-reversing defrost mode based on the outdoor heat exchanger 20 temperature after a sixth preset time delay; wherein the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time. The ninth preset temperature can be determined based on the time conditions, and the fifth and sixth preset times can be determined based on actual circumstances.

[0104] Specifically, the controller determines the current defrosting mode of the air conditioner 100. When the air conditioner 100 is running in the second non-reversing defrosting mode, it checks the opening degree of the electronic expansion valve 40, the temperature of the outdoor heat exchanger 20 against the ninth preset temperature, and the running time of the second non-reversing defrosting mode. If the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the temperature of the outdoor heat exchanger 20 is greater than the ninth preset temperature (where the ninth preset temperature is greater than the eighth preset temperature), it indicates that the defrosting of the outdoor heat exchanger 20 is complete, and the air conditioner 100 can be controlled to exit the second non-reversing defrosting mode. Alternatively, if the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the running time of the second non-reversing defrosting mode is greater than the fifth preset time, it indicates that the defrosting of the outdoor heat exchanger 20 is complete, and the air conditioner 100 can be controlled to exit the second non-reversing defrosting mode.

[0105] The current defrosting mode of the air conditioner 100 is determined. When the air conditioner 100 is running in the second non-reversing defrosting mode, the opening degree of the electronic expansion valve 40 is checked. When the opening degree of the electronic expansion valve 40 changes, it indicates that the air conditioner is still defrosting the outdoor heat exchanger 20 by increasing the opening degree of the electronic expansion valve 40. To ensure the stability of the temperature change of the outdoor heat exchanger 20, a sixth preset time can be delayed, for example, the sixth preset time can be 40 seconds. Then, the air conditioner 100 is checked to determine whether to exit the second non-reversing defrosting mode based on the temperature of the outdoor heat exchanger 20. That is, if the controller 80 does not detect a change in the opening degree of the electronic expansion valve 40, and the temperature of the outdoor heat exchanger 20 is greater than the ninth preset temperature or the running time of the second non-reversing defrosting mode is greater than the fifth preset time, the air conditioner 100 is controlled to exit the first non-reversing defrosting mode.

[0106] According to one embodiment of the present disclosure, the controller 80 is further configured to determine a ninth preset temperature based on the changing trend of the outdoor ambient temperature and the current outdoor ambient temperature.

[0107] Specifically, since the defrosting time of the air conditioner 100 is shorter in the first non-reversing defrosting mode and longer in the second non-reversing defrosting mode, the ninth preset temperature can also be determined based on the trend of outdoor ambient temperature changes and the current outdoor ambient temperature. For example, when the air conditioner 100 is defrosting in the second non-reversing defrosting mode, the trend of outdoor ambient temperature changes and the current outdoor ambient temperature are obtained. For instance, if the outdoor ambient temperature is rising, and when the outdoor ambient temperature is less than or equal to 1 degree Celsius, the ninth preset temperature can be determined to be 14 degrees Celsius. That is, when the temperature of the outdoor heat exchanger 20 exceeds 14 degrees Celsius, the current defrosting mode can be exited and the air conditioner 100 can resume normal heating. If the outdoor ambient temperature is greater than 1 degree Celsius, the ninth preset temperature can be determined to be 18 degrees Celsius. That is, when the temperature of the outdoor heat exchanger 20 exceeds 18 degrees Celsius, the current defrosting mode can be exited and the air conditioner 100 can resume normal heating.

[0108] The system acquires the trend of outdoor ambient temperature changes and the current outdoor ambient temperature. For example, when the outdoor ambient temperature is decreasing, if the outdoor ambient temperature is less than or equal to -1 degree Celsius, the ninth preset temperature can be determined to be 14 degrees Celsius. That is, when the temperature of the outdoor heat exchanger 20 exceeds 14 degrees Celsius, the current defrost mode can be exited and the normal heating mode of the air conditioner 100 can be restored. If the outdoor ambient temperature is greater than -1 degree Celsius, the ninth preset temperature can be determined to be 18 degrees Celsius. That is, when the temperature of the outdoor heat exchanger 20 exceeds 18 degrees Celsius, the current defrost mode can be exited and the normal heating mode of the air conditioner 100 can be restored.

[0109] This ensures a more reasonable temperature judgment when defrosting is completed, balancing the degree of defrosting cleanliness with the user experience.

[0110] According to one embodiment of this disclosure, the controller 80 is further configured to, when the air conditioner 100 enters a first non-reversing defrosting mode, control the compressor 70 to operate at a first operating frequency, stop the outdoor fan, and maintain the indoor fan speed unchanged; when the air conditioner 100 enters a second non-reversing defrosting mode, control the compressor 70 to operate at a second operating frequency, stop the outdoor fan, and reduce the indoor fan speed at a preset rate; wherein the first operating frequency is less than the second operating frequency. The first and second operating frequencies can be determined according to actual conditions.

[0111] Specifically, when the air conditioner 100 enters the first non-reversing defrosting mode, the controller 80 can control the compressor 70 to run continuously at the first operating frequency and control the outdoor fan to stop. If the outdoor fan continues to run, it may cause more air to pass through the outdoor heat exchanger 20, resulting in more severe frost. The controller also controls the indoor fan speed to remain constant, thereby ensuring that the indoor temperature does not drop while defrosting quickly.

[0112] When the air conditioner 100 enters the second non-reversing defrosting mode, the compressor 70 can be controlled to run continuously at a second operating frequency, which is greater than the first operating frequency. The outdoor fan can be stopped. If the outdoor fan continues to run, it may cause more air to pass through the outdoor heat exchanger 20, resulting in more severe frost. The indoor fan speed is controlled to be reduced at a preset rate to prevent the temperature entering the outdoor heat exchanger 20 from being too low, which would also cause more severe frost.

[0113] According to one embodiment of this disclosure, the electronic expansion valve 80 is a wide-range variable gain electronic expansion valve. Compared with a traditional electronic expansion valve, it can increase the upper limit flow while maintaining the lower limit flow. That is, in the non-reversing defrosting mode of the air conditioner 100, a larger refrigerant flow can be passed, thereby better defrosting the air conditioner 100.

[0114] According to one embodiment of this disclosure, the wide-range variable gain electronic expansion valve is also configured to change its opening degree based on load changes when the air conditioner 100 is operating in heating mode.

[0115] Specifically, when the air conditioner 100 is operating in heating mode, the wide-range variable gain electronic expansion valve can adjust its opening based on load changes. For example, the wide-range variable gain electronic expansion valve can be equipped with corresponding sensors to monitor parameters of the air conditioning system, such as temperature and pressure. After acquiring the parameters, the data can be sent to the controller 80. The controller 80 can determine whether the wide-range variable gain electronic expansion valve needs adjustment by comparing the difference between the current system load and the target load. If the system load increases, the controller 80 can control the opening of the wide-range variable gain electronic expansion valve to increase, so as to provide more refrigerant flow; conversely, if the system load decreases, the controller can control the opening of the wide-range variable gain electronic expansion valve to decrease. This improves the energy efficiency of the air conditioner 100 during heating, reduces energy consumption, and ensures stable system performance under different operating conditions.

[0116] According to one embodiment of this disclosure, as shown in FIG5, the wide-range variable gain electronic expansion valve includes a valve body 41, an inlet and an outlet, a valve seat 42 at the outlet, and a valve needle 43 on the valve seat 42. The gap between the valve needle 43 and the valve seat 42 forms a throttling orifice, and the valve needle 43 has a multi-angle adjustment section. The diameter of the valve seat 42 ranges from 1.6mm to 3.2mm.

[0117] Specifically, a throttling orifice 44 is provided on the valve seat 42, connecting the inner cavity of the valve body 41 to the outlet pipe. This allows the refrigerant in the pipeline to flow through the orifice 44. The valve stem 45 is connected to the valve needle 43, and the size of the throttling orifice 44 can be adjusted by controlling the movement of the valve stem 45. For example, moving the valve stem 45 upwards increases the size of the throttling orifice 44, while moving it downwards decreases the size, thus controlling the flow rate of the refrigerant in the pipeline. The valve body 41 can be made of brass.

[0118] As shown in Figure 6, the valve needle 43 can be trapezoidal. By setting the valve needle 43 to a trapezoidal shape and increasing the range of the valve seat 42's diameter, i.e., by increasing the valve seat width of the wide-range variable gain electronic expansion valve, compared to a traditional electronic expansion valve, the upper limit of the refrigerant flow in the pipeline is increased while maintaining the lower limit of refrigerant flow. This allows for a greater refrigerant flow, enabling the air conditioner 100 to defrost without reversing the direction of defrosting. The larger refrigerant flow can alter the heat exchange effect between the outdoor heat exchanger 20 and the frost layer, helping to ensure sufficient heat is transferred to the ice layer during defrosting for more effective melting. Furthermore, the trapezoidal valve needle 43 design improves the accuracy of flow regulation. Compared to other shapes, the trapezoidal shape allows for more precise adjustment of the refrigerant flow and more flexible response to electronic control adjustment signals, improving response speed. Simultaneously, the valve needle 43 can be adjusted at multiple angles (within the α range) to regulate the refrigerant flow in the pipeline. The valve seat 42's diameter can range from 1.6mm to 3.2mm.

[0119] Additionally, the valve needle 43 can be made conical, which helps reduce the pressure difference when the electronic expansion valve 40 starts, thereby reducing start-up power consumption and improving efficiency. Furthermore, designing a smaller diameter valve seat 42 allows for weight reduction, lowering the overall load on the electronic expansion valve 40. In space-constrained air conditioning systems, the compact valve seat design effectively saves space and reduces the volume of refrigerant flow, helping to decrease the system's internal volume and reduce energy consumption and refrigerant usage.

[0120] According to one embodiment of this disclosure, as shown in FIG7, the variable flow throttle valve 30 includes: a housing 81, wherein an installation channel 82 is formed within the housing 81, and the housing 81 has a first medium flow port 83 and a second medium flow port 84, the installation channel 82 communicating with the first medium flow port 83 and the second medium flow port 84; and a first valve seat 85, which is installed within the installation channel 82, the first valve seat 85 having an adjacent first hole 86 and a first medium flow channel 87, the first medium flow channel 87 communicating with the first medium flow port 83 and the first hole 86, the first hole 86 being adapted to communicate with the first medium flow channel 87 and the second medium flow port 84. 4; The first valve seat 85 also forms an adjacent second hole 88 and a second medium flow channel 89, the second medium flow channel 89 connects the second medium flow port 84 and the second hole 88, the second hole 88 is adapted to connect the first medium flow port 83 and the second medium flow channel 89; the first valve core 90 (not shown in the figure) is disposed in the first medium flow channel 87, and the first valve core 90 is movable along the first medium flow channel 87 to open or close the first hole 86; the second valve core 91 (not shown in the figure) is disposed in the second medium flow channel 89, and the second valve core 91 is movable along the second medium flow channel 89 to open or close the second hole 88.

[0121] Specifically, the variable flow throttle valve 30 may include a housing 81, which may be made of stainless steel, possessing the characteristics of corrosion resistance, high temperature resistance, and high strength, thus ensuring the stability and reliability of the air conditioning system. The housing 81 has a first medium flow port 83 and a second medium flow port 84. When the air conditioner 100 operates in different modes, the flow direction of the medium inside the variable flow throttle valve 30 is different, as shown in Figure 7. When the air conditioner 100 operates in cooling mode, the medium can flow from the first medium flow port 83 to the second medium flow port 84 (i.e., from end F to end C). When the air conditioner 100 operates in heating mode, the medium can flow from the second medium flow port 84 to the first medium flow port 83 (i.e., from end C to end F). An installation channel 82 is formed inside the housing 81, which connects the first medium flow port 83 to the second medium flow port 84.

[0122] The variable flow throttle valve 30 also includes a first valve seat 85, which has an adjacent first hole 86 and a first medium flow channel 87. A first valve core 90 is disposed within the first medium flow channel 87, allowing the first valve core 90 to move along the first medium flow channel 87 to open or close the first hole 86. For example, when the first valve core 90 moves upward, it can gradually open the first hole 86, allowing the medium to flow; when the first valve core 90 moves downward, it can gradually close the first hole 86, restricting the medium flow. When the first hole 86 is open, the medium can flow from the second medium flow port 84 to the first hole 86 and then to the first medium flow channel 87, finally exiting through the first medium flow port 83.

[0123] The valve seat 85 may also have an adjacent second hole 88 and a second medium flow channel 89. The second valve core 91 is disposed within the second medium flow channel 89, allowing it to move along the channel to open or close the second hole 88. For example, moving the second valve core 91 downwards gradually opens the second hole 88, allowing the medium to pass through; moving the second valve core 91 upwards gradually closes the second hole 88, restricting the flow of the medium. When the second hole 88 is open, the medium can flow from the first medium flow port 83 to the second hole 82, and then to the second medium flow channel 89, finally exiting through the second medium flow port 84.

[0124] According to one embodiment of this disclosure, as shown in FIG7, when the medium flows into the installation channel 82 through the first medium flow port 83, the medium drives the first valve core 90 to move and close the first hole 86 and drives the second valve core 91 to move and open the second hole 88; when the medium flows into the installation channel 82 through the second medium flow port 89, the medium drives the first valve core 90 to move and open the first hole 86 and drives the second valve core 91 to move and close the second hole 88; wherein, along the length direction of the installation channel 82, the first hole 86 and the second hole 88 are located between the first medium flow channel 87 and the second medium flow channel 89.

[0125] Specifically, when the air conditioner 100 is operating in cooling mode, the medium can flow into the installation channel 82 through the first medium flow port 83. When the medium flows into the installation channel 82 through the first medium flow port 83, the pressure of the medium inflow can drive the first valve core 90 to move and close the first hole 86, and can also drive the second valve core 91 to move and open the second hole 88. The medium will not flow out from the first hole 86, but from the second hole 88. When the air conditioner 100 is operating in heating mode, the medium can flow into the installation channel 82 through the second medium flow port 89. When the medium flows into the installation channel 82 through the second medium flow port 89, the pressure of the medium inflow can drive the first valve core 90 to move and open the first hole 86, and can also drive the second valve core 91 to move and close the second hole 88. The medium will not flow out from the second hole 88, but from the first hole 86. When the first hole 86 is open, the medium can flow through the first hole 86 to the first medium flow channel 87, and when the second hole 88 is open, the medium can flow through the second hole 88 to the second medium flow channel 89.

[0126] According to an embodiment of the present disclosure, as shown in FIG7, a throttling channel 92 and a conducting channel 93 are further formed inside the housing 81. The throttling channel 92 connects the first medium flow port 83 and the second hole 88, and the conducting channel 93 connects the second medium flow port 84 and the first hole 86. The throttling channel 92 and / or the conducting channel 93 are formed in the first valve seat 85.

[0127] Specifically, the variable flow throttle valve 30 has both throttling and conduction functions. Depending on the current operating mode of the air conditioner 100, it can automatically determine whether to throttle or conduct the medium. That is, a throttling channel 92 and a conduction channel 93 are formed within the housing 81 of the variable flow throttle valve 30. When the air conditioner 100 operates in cooling mode, the medium flows through the first medium flow port 83 to the throttling channel 92 and then to the second hole 88. When the air conditioner 100 operates in heating mode, the medium flows through the second medium flow port 84 to the conduction channel 93 and then to the first hole 86. Thus, the variable flow throttle valve 30 can achieve different functions depending on the different channels. The throttling channel 92 is formed in the first valve seat 85, or the conduction channel 93 is formed in the first valve seat 85, or both the throttling channel 92 and the conduction channel 93 are formed in the first valve seat 85, allowing the medium to flow to the first valve seat 85 from different directions.

[0128] According to one embodiment of the present disclosure, as shown in FIG7, a first connecting channel 94 is formed between the first valve seat 85 and the housing 81, the first connecting channel 94 connecting the throttling channel 92 and the first medium flow port 83; a second connecting channel 95 is formed between the first valve seat 85 and the housing 81, the second connecting channel 95 connecting the conducting channel 93 and the second medium flow port 84.

[0129] Specifically, when the air conditioner 100 is operating in cooling mode, the variable flow throttling valve 30 can regulate the flow rate of the medium. That is, when the medium flows into the installation channel 82 through the first medium flow port 83, it drives the first valve core 90 to move and close the first hole 86, and drives the second valve core 91 to move and open the second hole 88. When the first hole 86 is closed and the second hole 88 is open, the medium can flow from the first medium flow port 83 to the first connecting channel 94, and after passing through the throttling channel 92, it flows to the second hole 88, and finally flows out through the second medium flow port 84, thereby achieving throttling of the medium flow rate.

[0130] When the air conditioner 100 is operating in heating mode, the variable flow throttling valve 30 does not regulate the flow rate of the medium. That is, when the medium flows into the installation channel 82 through the second medium flow port 84, the medium drives the first valve core 90 to move and open the first hole 86, and drives the second valve core 91 to move and close the second hole 88. When the first hole 86 is open and the second hole 88 is closed, the medium can flow from the second medium flow port 84 to the second connecting channel 95, and after passing through the conducting channel 93, flow to the first hole 88, and finally flow out through the first medium flow port 83. No throttling is performed at this time to ensure the heating effect of the air conditioner. The medium can be refrigerant.

[0131] According to one embodiment of this disclosure, as shown in FIG7, a first limiting member 96 (not shown in the figure) is provided in the first medium flow channel 87. The first limiting member 96 is located on the side of the first valve core 90 away from the first hole 86. The first limiting member 96 forms a third connecting flow channel 97 that connects the first medium flow channel 87 and the first medium flow port 83. The first limiting member 96 is adapted to limit and cooperate with the first valve core 90. A second limiting member 98 (not shown in the figure) is provided in the second medium flow channel 89. The second limiting member 98 is located on the side of the second valve core 91 away from the second hole 88. The second limiting member 98 forms a fourth connecting flow channel 99 that connects the second medium flow channel 89 and the second medium flow port 84. The second limiting member 98 is adapted to limit and cooperate with the second valve core 91.

[0132] Specifically, by providing a first limiting member 96 in the first medium flow channel 87, adapted to limit and cooperate with the first valve core 90, and by providing a second limiting member 98 in the second medium flow channel 89, adapted to limit and cooperate with the second valve core 91, the movement range of the valve core is restricted within the designed parameter range through the cooperation of the limiting members. This prevents the valve core from over-opening or over-closing, ensuring that the system operates within a safe and stable range. Furthermore, the correct cooperation between the limiting members and the valve core helps to achieve precise control of the medium flow rate. By ensuring that the valve core stops or is limited at a predetermined position, the required flow level can be maintained without exceeding the design range.

[0133] The first limiting member 96 forms a third connecting channel 97 that connects the first medium flow channel 87 and the first medium flow port 83, and the second limiting member 98 forms a fourth connecting channel 99 that connects the second medium flow channel 89 and the second medium flow port 84. Thus, when the medium flows in from the first medium flow port 83, it can flow from the first medium flow port 83 to the first connecting channel 94, and after passing through the throttling channel 92, it can flow to the second hole 88, and then from the second hole 88 to the second medium flow channel 89, and then through the second medium flow channel 89 to the fourth connecting channel 99, and finally to the second medium flow port 84, and then out of the second medium flow port 84. When the medium flows in from the second medium flow port 84, it can flow from the second medium flow port 84 to the second connecting channel 95, and after passing through the connecting channel 93, it flows to the first hole 86, then from the first hole 86 to the first medium flow channel 87, and then through the first medium flow channel 87 to the third connecting channel 97, and finally to the first medium flow port 83, and then out of the first medium flow port 83.

[0134] According to one embodiment of the present disclosure, as shown in FIG7, the variable flow throttle valve 30 may further include: an elastic element 101, which is assembled in the second medium flow channel 89 and located between the second valve core 91 and the second limiting element 98, and the elastic element 101 is connected between the second valve core 91 and the second limiting element 98.

[0135] According to one embodiment of the present disclosure, as shown in FIG7, the second valve core 91 includes: a connected valve core body 102 (not shown in the figure) and a closing post 103 (not shown in the figure), the closing post 103 being used to open or close the second hole 88.

[0136] Specifically, the variable flow throttle valve 30 may further include an elastic element 101, which has a certain stroke to help limit the movement range of the second valve core 91 and ensure that the second valve core 91 regulates the flow rate within a suitable range. The second valve core 91 may include a connected valve core body 102 and a sealing column 103. The position of the valve core body 102 determines the size of the medium passing through the fourth connecting channel 99. When the air conditioner 100 is in cooling mode, the medium can flow in from the first medium flow port 83 and flow from the first medium flow port 83 to the first connecting channel 94, and after passing through the throttle channel 92, it flows to the second hole 88. At this time, the sealing column 103 can open the second hole 88, and then flow from the second hole 88 to the second medium flow channel 89. When the pressure of the medium (such as refrigerant) is low... The elastic element 101 has a small deformation, which allows for a small change in the position of the second valve core 91 and a small flow rate into the fourth connecting channel 99. This means a small flow of refrigerant flows out from the second medium flow port 84, ensuring a throttling effect and guaranteeing the reliability of the compressor 70's oil return. When the refrigerant pressure is high, the elastic element 101 has a larger deformation, allowing for a larger change in the position of the second valve core 91 and a larger flow rate into the fourth connecting channel 99. This means a large flow of refrigerant flows out from the second medium flow port 84, improving the cooling effect of the air conditioner 100. The elastic element 101 can be a spring.

[0137] According to one embodiment of the present disclosure, as shown in FIG7, the valve core body 102 is constructed in a cylindrical shape, or the sidewall of the valve core body 102 has at least one notch.

[0138] Specifically, the valve core body 102 is designed as a cylinder. Firstly, a cylindrical shape is easier to manufacture and maintain. Secondly, the cylindrical valve core body 102 has a uniform geometry, which helps to achieve a relatively uniform fluid distribution. This avoids uneven flow velocities generated when the medium passes through the variable flow throttle valve 30, thereby improving the stability of the air conditioning system. Alternatively, the sidewall of the valve core body 102 may have at least one notch, for example, two notches. This reduces vibration during the movement of the valve core body 102, improving system stability. Furthermore, the notch design can influence the eddies and turbulence generated when the medium passes through the valve core body 102. By adjusting the shape of the notch, these unstable fluid phenomena can be reduced, further improving system efficiency.

[0139] According to one embodiment of the present disclosure, as shown in FIG7, the variable flow throttle valve 30 may further include: a first filter element 103, which is installed in the installation channel 82 and located between the first valve seat 85 and the first medium flow port 83; and a second filter element 104, which is installed in the installation channel 82 and located between the first valve seat 85 and the second medium flow port 84.

[0140] Specifically, by providing a first filter element 103 between the first valve seat 85 and the first medium flow port 83, and a second filter element 104 between the first valve seat 85 and the second medium flow port 84, solid particles, impurities, silt, etc., in the medium can be blocked, preventing them from entering the variable flow throttle valve 30. This extends the service life of the variable flow throttle valve 30, reduces maintenance frequency, and improves system reliability. Furthermore, if the medium contains easily condensable substances or sediments, these may accumulate inside or in the pipeline when flowing through the variable flow throttle valve 30, causing blockage. Providing the first filter element 103 and the second filter element 104 reduces the risk of blockage, ensuring smooth fluid flow through the throttle valve. The first filter element 103 and the second filter element 104 can be filter screens.

[0141] In summary, according to the air conditioner of this disclosure, the variable flow throttling valve is configured to automatically adjust the refrigerant flow rate during cooling operation to adapt to load changes, and the electronic expansion valve is configured to increase its opening degree during non-reversing defrosting operation, with the opening degree changing in stages. Therefore, this air conditioner can achieve non-reversing defrosting at low cost, reduce the risk of short circuits and burnout in the electrical control system, ensure heating performance when the refrigerant flow rate is low, ensure throttling effect and reliable compressor oil return during low load, and ensure sufficient flow and cooling performance during high load.

[0142] Corresponding to the above embodiments, this disclosure also proposes a control method for an air conditioner. As shown in FIG1, the air conditioner 100 may include a compressor 70, a reversing device 60, an outdoor heat exchanger 20, an electronic expansion valve 40, a refrigerant loop 50, a variable flow throttle valve 30, and an indoor heat exchanger 10 connected in sequence. As shown in FIG8, the control method of the air conditioner in this embodiment includes the following steps:

[0143] S1, determine the operating conditions of the air conditioner;

[0144] S2, when the air conditioner is in cooling operation, automatically adjusts the refrigerant flow based on the variable flow throttle valve to adapt to load changes.

[0145] S3 adjusts the opening of the electronic expansion valve to increase when the air conditioner is not reversing its defrosting operation, and the opening changes in stages.

[0146] According to one embodiment of this disclosure, determining the lower limit opening degree of an electronic expansion valve based on the outdoor ambient temperature includes: setting a first opening value as the lower limit opening degree when the outdoor ambient temperature is less than or equal to a first preset outdoor temperature; determining the lower limit opening degree according to a preset linear relationship when the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to a second preset outdoor temperature; and setting a second opening value as the lower limit opening degree when the outdoor ambient temperature is greater than the second preset outdoor temperature. The preset linear relationship is a linear function with the outdoor ambient temperature as the variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value.

[0147] According to one embodiment of this disclosure, adjusting the opening of an electronic expansion valve in a stepwise manner includes: acquiring the current opening of the electronic expansion valve and adjusting the opening of the electronic expansion valve multiple times based on the current opening, so that the opening of the electronic expansion valve changes in a stepwise manner.

[0148] According to one embodiment of this disclosure, the opening of an electronic expansion valve is adjusted multiple times based on the current opening, including: determining the target opening and the number of opening adjustments for the electronic expansion valve, determining an adjustment step size based on the current opening, the target opening, and the number of opening adjustments, and adjusting the opening of the electronic expansion valve multiple times based on the adjustment step size.

[0149] According to one embodiment of this disclosure, the control method for an air conditioner further includes: acquiring at least one of an indoor ambient temperature, an outdoor ambient temperature, and an outdoor heat exchanger temperature, and determining that the air conditioner will not reverse defrost operation based on at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature.

[0150] According to one embodiment of the present disclosure, the air conditioner is controlled not to switch to defrosting mode if any of the following conditions are not met: (1) the indoor ambient temperature is less than a first preset temperature, or the outdoor ambient temperature is less than a second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than a third preset temperature; (2) the change in the outdoor heat exchanger temperature is less than a fourth preset temperature; (3) the outdoor ambient temperature is less than a fifth preset temperature and the air conditioner does not enter defrosting mode within a second preset time, wherein the fifth preset temperature is greater than the second preset temperature.

[0151] According to one embodiment of this disclosure, the control method for an air conditioner further includes: acquiring a first temperature change value of an outdoor heat exchanger and a second temperature change value of the outdoor ambient temperature within a third preset time period; and determining the temperature change value of the outdoor heat exchanger based on the relationship between the first temperature change value and the second temperature change value.

[0152] According to one embodiment of this disclosure, the control method for an air conditioner further includes: controlling the air conditioner to enter a first non-reversing defrosting mode when the change value of the outdoor heat exchanger temperature is less than a sixth preset temperature; and controlling the air conditioner to enter a second non-reversing defrosting mode when the change value of the outdoor heat exchanger temperature is less than a seventh preset temperature; wherein the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

[0153] According to one embodiment of this disclosure, when the air conditioner is running in a first non-reversing defrosting mode, the method further includes: if no change in the opening degree of the electronic expansion valve is detected, then if the outdoor heat exchanger temperature is greater than an eighth preset temperature or the running time of the first non-reversing defrosting mode is greater than a third preset time, controlling the air conditioner to exit the first non-reversing defrosting mode; if a change in the opening degree of the electronic expansion valve is detected, then after a fourth preset time, determining whether the air conditioner should exit the first non-reversing defrosting mode based on the outdoor heat exchanger temperature.

[0154] According to one embodiment of this disclosure, when the air conditioner is running in a second non-reversing defrosting mode, the method further includes: if no change in the opening degree of the electronic expansion valve is detected, then if the outdoor heat exchanger temperature is greater than a ninth preset temperature or the running time of the second non-reversing defrosting mode is greater than a fifth preset time, controlling the air conditioner to exit the second non-reversing defrosting mode; if a change in the opening degree of the electronic expansion valve is detected, then after a sixth preset time, determining whether the air conditioner should exit the second non-reversing defrosting mode based on the outdoor heat exchanger temperature; wherein, the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time.

[0155] According to one embodiment of this disclosure, the control method for an air conditioner further includes: when the air conditioner enters a first non-reversing defrosting mode, controlling the compressor to operate at a first operating frequency, stopping the outdoor fan, and keeping the speed of the indoor fan unchanged; when the air conditioner enters a second non-reversing defrosting mode, controlling the compressor to operate at a second operating frequency, stopping the outdoor fan, and reducing the speed of the indoor fan at a preset rate; wherein the first operating frequency is less than the second operating frequency.

[0156] The control method of this disclosure will be described below with reference to Figure 9.

[0157] As a specific example, the control method for the air conditioner disclosed herein may include the following steps:

[0158] S101, determine the operating conditions of the air conditioner.

[0159] S102, Determine whether the air conditioner is operating in cooling mode. If yes, proceed to step S103; if no, proceed to step S109.

[0160] S103, determine whether the outdoor ambient temperature is less than or equal to the first preset outdoor temperature. If yes, proceed to step S104; if no, proceed to step S105.

[0161] S104, set the first opening value to the lower limit opening of the electronic expansion valve.

[0162] S105, determine whether the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset temperature. If yes, proceed to step S106; if no, proceed to step S107.

[0163] S106, determine the lower limit opening degree of the electronic expansion valve according to the preset linear relationship.

[0164] S107, Determine whether the outdoor ambient temperature is greater than the second preset temperature. If yes, proceed to step S108; if no, proceed to step S101.

[0165] S108, set the second opening value to the lower limit opening of the electronic expansion valve.

[0166] S109. Determine whether all conditions are not met. If yes, proceed to step S110; otherwise, proceed to step S115.

[0167] S110, determine whether the change in outdoor heat exchanger temperature is less than the sixth preset temperature. If yes, proceed to step S111; if no, proceed to step S116.

[0168] S111 controls the air conditioner to enter the first non-reversing defrosting mode and controls the compressor to run at the first operating frequency, the outdoor fan to stop, and the indoor fan speed to remain unchanged.

[0169] S112, Determine whether the opening degree of the electronic expansion valve has changed. If yes, proceed to step S113; if no, proceed to step S114.

[0170] S113, when the temperature of the outdoor heat exchanger is greater than the eighth preset temperature or the running time of the first non-reversing defrosting mode is greater than the third preset time, control the air conditioner to exit the first non-reversing defrosting mode.

[0171] S114, after a fourth preset time delay, determine whether to exit the first non-reversing defrosting mode based on the outdoor heat exchanger temperature.

[0172] S115 controls the reversing of the four-way valve to put the air conditioner into reversing defrosting mode.

[0173] S116, determine whether the change in outdoor heat exchanger temperature is less than the seventh preset temperature. If yes, proceed to step S117; if no, proceed to step S109.

[0174] S117 controls the air conditioner to enter the second non-reversing defrosting mode and controls the compressor to run at the second operating frequency, the outdoor fan to stop, and the indoor fan speed to decrease according to the preset rate.

[0175] S118, determine if the opening degree of the electronic expansion valve has changed. If yes, proceed to step S119; otherwise, proceed to step S120.

[0176] S119: When the temperature of the outdoor heat exchanger is greater than the ninth preset temperature or the running time of the second non-reversing defrosting mode is greater than the fifth preset time, control the air conditioner to exit the second non-reversing defrosting mode.

[0177] S120, after a sixth preset time delay, determine whether to exit the second non-reversing defrosting mode based on the outdoor heat exchanger temperature.

[0178] It should be noted that for details not disclosed in the control method of the air conditioner in the embodiments of this disclosure, please refer to the details disclosed in the air conditioner in the embodiments of this disclosure, which will not be repeated here.

[0179] According to the air conditioner control method of this disclosure, the operating conditions of the air conditioner are determined. When the air conditioner is in cooling operation, the refrigerant flow is automatically adjusted based on a variable flow throttle valve to adapt to load changes. When the air conditioner is in non-reversing defrosting operation, the opening of the electronic expansion valve is increased, and the opening changes in stages. Therefore, this method can achieve non-reversing defrosting at low cost, reduce the risk of short circuits and burnout in the electronic control system, ensure the heating effect of the air conditioner when the refrigerant flow is low, ensure the throttling effect and guarantee the reliability of compressor oil return when the air conditioner is under low load, and ensure sufficient flow and cooling effect when the air conditioner is under high load.

[0180] Corresponding to the above embodiments, this disclosure also proposes a computer-readable storage medium.

[0181] The computer-readable storage medium of this disclosure stores a computer program thereon, which, when executed by a processor, implements the above-described air conditioner control method.

[0182] According to the computer-readable storage medium of the present disclosure, by executing the above-described air conditioner control method, it is possible to achieve non-reversing defrosting at low cost and reduce the risk of short circuit burnout of the electronic control unit. It can ensure the heating effect of the air conditioner when the refrigerant flow is low, ensure the throttling effect when the air conditioner is under low load, ensure the reliability of compressor oil return, ensure sufficient flow when the air conditioner is under high load, and ensure the cooling effect of the air conditioner.

[0183] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0184] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0185] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0186] Furthermore, 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 at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0187] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0188] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An air conditioner comprising: The compressor, reversing device, outdoor heat exchanger, electronic expansion valve, refrigerant loop, variable flow throttle valve, and indoor heat exchanger are connected in sequence. The variable flow throttle valve is configured to automatically adjust the refrigerant flow rate to adapt to load changes when the air conditioner is in cooling operation. The electronic expansion valve is configured to increase its opening degree when the air conditioner is not reversing its defrosting operation, and the opening degree changes in stages.

2. The air conditioner of claim 1, wherein, Also includes: The controller is configured to, when the air conditioner is in cooling operation, determine the lower limit opening of the electronic expansion valve based on the outdoor ambient temperature, and limit the opening of the electronic expansion valve based on the lower limit opening.

3. The air conditioner of claim 2, wherein, The controller is also configured to, When the outdoor ambient temperature is less than or equal to the first preset outdoor temperature, the first opening value is set as the lower limit opening value; When the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset outdoor temperature, the lower limit opening degree is determined according to a preset linear relationship. If the outdoor ambient temperature is greater than the second preset outdoor temperature, the second opening value is set to the lower limit opening value; Wherein, the preset linear relationship is a linear function with the outdoor ambient temperature as the variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value.

4. The air conditioner according to claim 2 or 3, wherein The controller is also configured to, when the air conditioner is not reversing defrosting operation, acquire the current opening degree of the electronic expansion valve, and adjust the opening degree of the electronic expansion valve multiple times according to the current opening degree, so that the opening degree of the electronic expansion valve changes in stages.

5. The air conditioner of claim 4, wherein, The controller is further configured to determine the target opening degree and the number of opening degree adjustments of the electronic expansion valve, determine an adjustment step size based on the current opening degree, the target opening degree and the number of opening degree adjustments, and perform multiple increases in the opening degree of the electronic expansion valve based on the adjustment step size.

6. The air conditioner of claim 1, wherein, Also includes: The controller is further configured to acquire at least one of an indoor ambient temperature, an outdoor ambient temperature, and an outdoor heat exchanger temperature, and determine, based on at least one of the indoor ambient temperature, an outdoor ambient temperature, and an outdoor heat exchanger temperature, that the air conditioner is in non-reversing defrosting operation.

7. The air conditioner of claim 6, wherein, If the controller determines that none of the following conditions are met, it will control the air conditioner to operate without reversing the defrosting cycle: (1) The indoor ambient temperature is less than the first preset temperature, or the outdoor ambient temperature is less than the second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the third preset temperature; (2) The temperature change of the outdoor heat exchanger is less than the fourth preset temperature; (3) The outdoor ambient temperature is less than the fifth preset temperature and the air conditioner does not enter the defrosting mode within the second preset time, wherein the fifth preset temperature is greater than the second preset temperature.

8. The air conditioner of claim 7, wherein, The controller is also configured to, Obtain the first temperature change value of the outdoor heat exchanger and the second temperature change value of the outdoor ambient temperature within a third preset time period; The temperature change of the outdoor heat exchanger is determined based on the relationship between the first temperature change value and the second temperature change value.

9. The air conditioner according to claim 7 or 8, wherein The controller is also configured to, When the change in the outdoor heat exchanger temperature is less than the sixth preset temperature, the air conditioner is controlled to enter the first non-reversing defrosting mode. When the change in the outdoor heat exchanger temperature is less than the seventh preset temperature, the air conditioner is controlled to enter the second non-reversing defrosting mode; wherein the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

10. The air conditioner of claim 9, wherein, The controller is further configured to, when the air conditioner is operating in the first non-reversing defrosting mode, wherein... If no change in the opening of the electronic expansion valve is detected, the air conditioner will be controlled to exit the first non-reversing defrosting mode if the outdoor heat exchanger temperature is greater than the eighth preset temperature or the running time of the first non-reversing defrosting mode is greater than the third preset time. If a change in the opening degree of the electronic expansion valve is detected, a fourth preset time is then applied, and the outdoor heat exchanger temperature is used to determine the appropriate action. Does the air conditioner exit the first non-reversing defrosting mode? 11. The air conditioner according to claim 9 or 10, wherein The controller is further configured to, when the air conditioner is operating in the second non-reversing defrosting mode, wherein... If no change in the opening of the electronic expansion valve is detected, the air conditioner will be controlled to exit the second non-reversing defrosting mode if the outdoor heat exchanger temperature is greater than the ninth preset temperature or the running time of the second non-reversing defrosting mode is greater than the fifth preset time. If a change in the opening of the electronic expansion valve is detected, after a sixth preset time, it is determined whether the air conditioner should exit the second non-reversing defrosting mode based on the outdoor heat exchanger temperature; wherein, the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time.

12. The air conditioner of any of claims 9-11, wherein, The controller is also configured to, When the air conditioner enters the first non-reversing defrosting mode, the compressor is controlled to run at a first operating frequency, the outdoor fan is stopped, and the speed of the indoor fan remains unchanged. When the air conditioner enters the second non-reversing defrosting mode, the compressor is controlled to operate at a second operating frequency, the outdoor fan is stopped, and the speed of the indoor fan is reduced at a preset rate; wherein, the first operating frequency is less than the second operating frequency.

13. The air conditioner of any one of claims 1-12, wherein, The electronic expansion valve is a wide-range variable gain electronic expansion valve.

14. The air conditioner of claim 13, wherein, The wide-range variable gain electronic expansion valve is also configured to change its opening degree based on the load change when the air conditioner is operating in heating mode.

15. The air conditioner according to claim 13 or 14, wherein The wide-range variable gain electronic expansion valve includes a valve body with an inlet and an outlet. A valve seat is provided at the outlet, and a valve needle is provided on the valve seat. The gap between the valve needle and the valve seat forms a throttling orifice. The valve needle adjustment section is designed with multiple angles.

16. The air conditioner of claim 15, wherein, The diameter of the valve seat ranges from 1.6mm to 3.2mm.

17. The air conditioner of any one of claims 1-16, wherein, The variable flow throttle valve includes: The housing has an installation channel formed inside it, and the housing has a first medium flow port and a second medium flow port. The installation channel connects the first medium flow port and the second medium flow port. A first valve seat is installed in the installation channel. The first valve seat has an adjacent first hole and a first medium flow channel. The first medium flow channel connects the first medium flow port and the first hole. The first hole is adapted to connect the first medium flow channel and the second medium flow port. The first valve seat also forms an adjacent second hole and a second medium flow channel, the second medium flow channel connecting the second medium flow port and the second hole, and the second hole being adapted to connect the first medium flow port and the second medium flow channel; The first valve core is disposed in the first medium flow channel and can move along the first medium flow channel to open or close the first hole. The second valve core is disposed in the second medium flow channel and is movable along the second medium flow channel to open or close the second hole.

18. The air conditioner of claim 17, wherein, When the medium flows into the installation channel through the first medium flow port, the medium drives the first valve core to move and close the first hole and drives the second valve core to move and open the second hole. When the medium flows into the installation channel through the second medium flow port, the medium drives the first valve core to move and open the first hole and drives the second valve core to move and close the second hole; Along the length of the installation channel, the first hole and the second hole are located between the first medium flow channel and the second medium flow channel.

19. The air conditioner of claim 17 or 18, wherein, The housing also contains a throttling channel and a conducting channel. The throttling channel connects the first medium flow port and the second hole, and the conducting channel connects the second medium flow port and the first hole. The throttling channel and / or the conducting channel are formed in the first valve seat.

20. The air conditioner of claim 19, wherein, A first connecting flow channel is formed between the first valve seat and the outer shell, and the first connecting flow channel connects the throttling channel and the first medium flow port; A second connecting channel is formed between the first valve seat and the outer casing, and the second connecting channel connects the conducting channel and the second medium flow port.

21. The air conditioner according to any one of claims 17-20, wherein, The first medium flow channel is provided with a first limiting member. The first limiting member is located on the side of the first valve core away from the first hole. The first limiting member forms a third connecting flow channel that connects the first medium flow channel and the first medium flow port. The first limiting member is adapted to limit and cooperate with the first valve core. The second medium flow channel is provided with a second limiting member. The second limiting member is located on the side of the second valve core away from the second hole. The second limiting member forms a fourth connecting flow channel that connects the second medium flow channel and the second medium flow port. The second limiting member is adapted to cooperate with the second valve core for limiting.

22. The air conditioner of claim 21, wherein, The variable flow throttle valve further includes: an elastic element, which is assembled in the second medium flow channel and located between the second valve core and the second limiting element, and the elastic element is connected between the second valve core and the second limiting element.

23. The air conditioner of any of claims 17-22, wherein, The second valve core includes a valve core body and a sealing post connected together, the sealing post being used to open or close the second hole.

24. The air conditioner of claim 23, wherein, The valve core body is cylindrical, or the sidewall of the valve core body has at least one notch.

25. The air conditioner of any of claims 17-24, wherein, The variable flow throttle valve also includes: The first filter element is installed in the installation channel and located between the first valve seat and the first medium flow port; The second filter element is installed in the installation channel and located between the first valve seat and the second medium flow port.

26. A control method for an air conditioner, the air conditioner comprising: The method comprises a compressor, a reversing device, an outdoor heat exchanger, an electronic expansion valve, a refrigerant loop, a variable flow throttle valve, and an indoor heat exchanger connected in sequence, wherein the method includes: Determine the operating conditions of the air conditioner; When the air conditioner is in cooling operation, the refrigerant flow is automatically adjusted based on the variable flow throttle valve to adapt to load changes; When the air conditioner is not in defrosting mode, the opening of the electronic expansion valve is adjusted to increase, and the opening changes in stages.

27. The control method according to claim 26, wherein Also includes: The lower limit opening degree of the electronic expansion valve is determined based on the outdoor ambient temperature, and the opening degree of the electronic expansion valve is limited based on the lower limit opening degree.

28. The control method according to claim 27, wherein Determining the lower limit opening of the electronic expansion valve based on the outdoor ambient temperature includes: When the outdoor ambient temperature is less than or equal to the first preset outdoor temperature, the first opening value is set as the lower limit opening value; When the outdoor ambient temperature is greater than the first preset outdoor temperature and less than or equal to the second preset outdoor temperature, the lower limit opening degree is determined according to a preset linear relationship. If the outdoor ambient temperature is greater than the second preset outdoor temperature, the second opening value is set to the lower limit opening value; Wherein, the preset linear relationship is a linear function with the outdoor ambient temperature as the variable, the first opening value is less than the minimum value of the preset linear relationship, and the maximum value of the preset linear relationship is less than the second opening value.

29. The control method according to claim 27 or 28, wherein Adjusting the opening of the electronic expansion valve to increase in a stepwise manner includes: The current opening degree of the electronic expansion valve is obtained, and the opening degree of the electronic expansion valve is adjusted multiple times according to the current opening degree so that the opening degree of the electronic expansion valve changes in stages.

30. The control method according to claim 29, wherein The opening of the electronic expansion valve is adjusted multiple times based on the current opening, including: The target opening degree and the number of opening degree adjustments of the electronic expansion valve are determined, and the adjustment step size is determined based on the current opening degree, the target opening degree, and the number of opening degree adjustments. The opening degree of the electronic expansion valve is then adjusted multiple times according to the adjustment step size.

31. The control method according to any one of claims 26-30, wherein, Also includes: The system acquires at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature, and determines that the air conditioner is in non-reversing defrosting operation based on at least one of the indoor ambient temperature, the outdoor ambient temperature, and the outdoor heat exchanger temperature.

32. The control method according to claim 31, wherein If any of the following conditions are not met, the air conditioner will be controlled to operate without reversing the defrosting cycle: (1) The indoor ambient temperature is less than the first preset temperature, or the outdoor ambient temperature is less than the second preset temperature, or the sum of the indoor ambient temperature and the outdoor ambient temperature is less than the third preset temperature; (2) The temperature change of the outdoor heat exchanger is less than the fourth preset temperature; (3) The outdoor ambient temperature is less than the fifth preset temperature and the air conditioner does not enter the defrosting mode within the second preset time, wherein the fifth preset temperature is greater than the second preset temperature.

33. The control method according to claim 32, wherein Also includes: Obtain the first temperature change value of the outdoor heat exchanger and the second temperature change value of the outdoor ambient temperature within a third preset time period; The temperature change of the outdoor heat exchanger is determined based on the relationship between the first temperature change value and the second temperature change value.

34. The control method according to claim 32 or 33, wherein Also includes: When the change in the outdoor heat exchanger temperature is less than the sixth preset temperature, the air conditioner is controlled to enter the first non-reversing defrosting mode. When the change in the outdoor heat exchanger temperature is less than the seventh preset temperature, the air conditioner is controlled to enter the second non-reversing defrosting mode; wherein the seventh preset temperature is less than the sixth preset temperature, and the sixth preset temperature is greater than the fourth preset temperature.

35. The control method according to claim 34, wherein When the air conditioner is operating in the first non-reversing defrosting mode, the method further includes: If no change in the opening of the electronic expansion valve is detected, the air conditioner will be controlled to exit the first non-reversing defrosting mode if the outdoor heat exchanger temperature is greater than the eighth preset temperature or the running time of the first non-reversing defrosting mode is greater than the third preset time. If a change in the opening of the electronic expansion valve is detected, after a fourth preset time delay, the air conditioner is judged whether to exit the first non-reversing defrosting mode based on the outdoor heat exchanger temperature.

36. The control method according to claim 34 or 35, wherein When the air conditioner is operating in the second non-reversing defrosting mode, the method further includes: If no change in the opening of the electronic expansion valve is detected, the air conditioner will be controlled to exit the second non-reversing defrosting mode if the outdoor heat exchanger temperature is greater than the ninth preset temperature or the running time of the second non-reversing defrosting mode is greater than the fifth preset time. If a change in the opening of the electronic expansion valve is detected, after a sixth preset time, it is determined whether the air conditioner should exit the second non-reversing defrosting mode based on the outdoor heat exchanger temperature; wherein, the ninth preset temperature is greater than the eighth preset temperature, and the fifth preset time is greater than the third preset time.

37. The control method according to any one of claims 34-36, wherein, Also includes: When the air conditioner enters the first non-reversing defrosting mode, the compressor is controlled to run at a first operating frequency, the outdoor fan is stopped, and the speed of the indoor fan remains unchanged. When the air conditioner enters the second non-reversing defrosting mode, the compressor is controlled to operate at a second operating frequency, the outdoor fan is stopped, and the speed of the indoor fan is reduced at a preset rate; wherein, the first operating frequency is less than the second operating frequency.

38. A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of the air conditioner according to any one of claims 26-37.

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