Control method of air conditioner, air conditioner and storage medium

Abstract

The invention discloses a control method of an air conditioner, the air conditioner and a storage medium, and relates to the technical field of air conditioners, the air conditioner comprises a refrigerant system, the refrigerant system comprises an indoor heat exchanger, a first throttling component and an outdoor heat exchanger which are connected in sequence, and the first throttling component is connected with an electronic expansion valve in parallel; the method comprises the steps that the air conditioner is controlled to operate in a heating mode so that an indoor heat exchanger can be in a condensation state and an outdoor heat exchanger can be in an evaporation state, and an electronic expansion valve is controlled to operate at a throttling opening degree; and under the condition that the air conditioner meets the first defrosting starting condition, the electronic expansion valve is controlled to operate at the defrosting opening degree larger than the throttling opening degree so as to defrost the outdoor heat exchanger. The indoor comfort in the defrosting process is improved, and meanwhile the service life of the compressor is prolonged.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to control methods for air conditioners, air conditioners, and storage media. Background Technology

[0002] When an air conditioner is running at low temperature for heating, the outdoor heat exchanger is in an evaporating state, which can easily lead to frost formation and affect the air conditioner's performance.

[0003] Currently, defrosting is generally achieved by switching the outdoor heat exchanger to a condensing state through the reversing component in the air conditioner. However, the compressor needs to be stopped during the reversing process, which can easily lead to frequent compressor start-stop and affect its lifespan. During the defrosting process, the indoor heat exchanger is in an evaporating state, which will cause it to stop releasing heat to the room, affecting indoor comfort. Summary of the Invention

[0004] The main objective of this application is to provide a control method for an air conditioner, an air conditioner, and a storage medium, which aims to improve indoor comfort during the defrosting process while extending the life of the compressor.

[0005] To achieve the above objectives, this application proposes a control method for an air conditioner, the air conditioner including a refrigerant system, the refrigerant system including an indoor heat exchanger, a first throttling component, and an outdoor heat exchanger connected in sequence, the first throttling component being connected in parallel with an electronic expansion valve, the method including:

[0006] The air conditioner is controlled to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and the electronic expansion valve is controlled to operate at a throttling opening.

[0007] When the air conditioner meets the first defrost start condition, the electronic expansion valve is controlled to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger.

[0008] In one embodiment, prior to the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger when the air conditioner meets the first defrost start condition, the method further includes:

[0009] Control the indoor fan corresponding to the indoor heat exchanger to reduce its speed; and / or,

[0010] Control the compressor in the refrigerant system to reduce its frequency; and / or,

[0011] The outdoor fan corresponding to the outdoor heat exchanger is controlled to operate at or be turned off at a defrosting speed, wherein the defrosting speed is less than the heating speed of the outdoor fan in the heating mode.

[0012] In one embodiment, prior to the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger, the method further includes:

[0013] When the air conditioner meets the first defrosting start condition, the indoor fan speed is reduced.

[0014] If the temperature of the indoor heat exchanger is higher than the first preset temperature, the compressor frequency is reduced.

[0015] Control the outdoor fan corresponding to the outdoor heat exchanger to operate at defrost speed or shut down.

[0016] In one embodiment, the step of controlling the outdoor fan corresponding to the outdoor heat exchanger to operate at defrost speed or to shut down includes:

[0017] Obtain the outdoor temperature of the environment where the air conditioner is located;

[0018] When the outdoor temperature is higher than the preset ambient temperature, the outdoor fan is controlled to operate at the defrosting speed.

[0019] When the outdoor temperature is less than or equal to the preset ambient temperature, the outdoor fan is controlled to shut down.

[0020] In one embodiment, the first defrosting start condition includes a first start condition corresponding to a first defrosting mode or a second start condition corresponding to a second defrosting mode, wherein the frost thickness of the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness of the outdoor heat exchanger corresponding to the second defrosting mode, and the step of controlling the indoor fan to reduce its speed when the air conditioner meets the first defrosting start condition includes:

[0021] When the air conditioner meets the first start-up condition, the indoor fan is controlled to reduce to a first speed.

[0022] When the air conditioner meets the second start-up condition, the indoor fan is controlled to reduce to the second speed or be turned off;

[0023] Wherein, the first rotational speed is greater than the second rotational speed.

[0024] In one embodiment, after the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger when the air conditioner meets the first defrost start condition, the method further includes:

[0025] When the air conditioner meets the defrost exit conditions, the air conditioner is controlled to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and the electronic expansion valve is controlled to operate at a throttling opening.

[0026] The defrosting exit conditions include the outdoor heat exchanger temperature being greater than or equal to the second preset temperature, and / or the electronic expansion valve operating at an increased opening for a duration greater than or equal to the first preset duration.

[0027] In one embodiment, the first defrosting start condition includes a first start condition corresponding to a first defrosting mode or a second start condition corresponding to a second defrosting mode, wherein the frost thickness of the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness of the outdoor heat exchanger corresponding to the second defrosting mode.

[0028] The defrosting exit condition corresponding to the first defrosting mode includes the outdoor heat exchanger temperature being greater than or equal to the second preset temperature. The defrosting exit condition corresponding to the second defrosting mode includes a first exit condition or a second exit condition. The first exit condition includes the electronic expansion valve operating at the increased opening for a duration greater than or equal to the first preset duration. The second exit condition includes the electronic expansion valve operating at the increased opening for a duration less than the first preset duration and the outdoor heat exchanger temperature being greater than or equal to the second preset temperature.

[0029] In one embodiment, the refrigerant system further includes a compressor, a reversing assembly, a second throttling component, and a refrigerant heat dissipation assembly. The refrigerant heat dissipation assembly is configured to dissipate heat from the heat-generating components. The indoor heat exchanger, the second throttling component, the refrigerant heat dissipation assembly, and the first throttling component are connected in sequence. The compressor, the indoor heat exchanger, and the outdoor heat exchanger are all connected to the reversing assembly.

[0030] The step of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state includes: controlling the reversing assembly to operate in a first state so that the exhaust port of the compressor is connected to the indoor heat exchanger and the return port of the compressor is connected to the outdoor heat exchanger.

[0031] After the steps of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, when the air conditioner meets the second exit condition, the method further includes: when the air conditioner meets the second start condition, controlling the reversing assembly to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening.

[0032] In one embodiment, the refrigerant system further includes a compressor, a reversing assembly, a second throttling component, and a refrigerant heat dissipation assembly, wherein the refrigerant heat dissipation assembly is configured to dissipate heat from the heat-generating components, and the indoor heat exchanger, the second throttling component, the refrigerant heat dissipation assembly, and the first throttling component are connected in sequence.

[0033] The step of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state includes: controlling the reversing assembly to operate in a first state so that the exhaust port of the compressor is connected to the indoor heat exchanger and the return port of the compressor is connected to the outdoor heat exchanger.

[0034] After the steps of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, the method further includes: when the air conditioner meets the second defrosting start condition, controlling the reversing assembly to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening;

[0035] Wherein, the frost thickness of the outdoor heat exchanger indicated by the second defrost start condition is greater than the frost thickness of the outdoor heat exchanger indicated by the first defrost start condition.

[0036] In one embodiment, after controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, the method further includes:

[0037] Obtain the outdoor temperature of the environment where the air conditioner is located and the initial temperature of the outdoor heat exchanger;

[0038] When the temperature difference between the outdoor temperature and the initial temperature is greater than the second preset temperature difference, the reversing assembly is controlled to operate in the second state so that the exhaust port of the compressor is connected to the outdoor heat exchanger and the return port of the compressor is connected to the indoor heat exchanger, and the electronic expansion valve is controlled to operate at an opening greater than the throttling opening.

[0039] When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset time, and when the air conditioner meets the first defrost start condition, the electronic expansion valve is controlled to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger.

[0040] When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset duration, and when the air conditioner meets the second defrosting start condition, the reversing component is controlled to switch from the first state to the second state so that the exhaust port of the compressor is connected to the outdoor heat exchanger and the return port of the compressor is connected to the indoor heat exchanger, and the electronic expansion valve is controlled to operate at an opening greater than the throttling opening.

[0041] In one embodiment, after the step of obtaining the outdoor temperature of the environment where the air conditioner is located and the initial temperature of the outdoor heat exchanger, the method further includes:

[0042] When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset time, when the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger is less than the third preset temperature difference and the temperature of the indoor heat exchanger is less than or equal to the third preset temperature, the electronic expansion valve is controlled to reduce its opening.

[0043] When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset duration, when the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger is greater than the third preset temperature difference, and the air conditioner meets the first defrost start condition, the electronic expansion valve is controlled to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger; when the air conditioner meets the second defrost start condition, the reversing assembly is controlled to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and the electronic expansion valve is controlled to operate at an opening greater than the throttling opening.

[0044] In one embodiment, the first defrosting start condition includes a first start condition corresponding to a first defrosting mode or a second start condition corresponding to a second defrosting mode, wherein the frost thickness of the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness of the outdoor heat exchanger corresponding to the second defrosting mode.

[0045] The first start-up condition includes the temperature difference between the initial temperature of the outdoor heat exchanger and the current temperature of the outdoor heat exchanger in the heating mode being greater than or equal to a third preset temperature difference and less than or equal to a fourth preset temperature difference.

[0046] The second start-up condition includes that the temperature difference between the initial temperature of the outdoor heat exchanger and the current temperature of the outdoor heat exchanger in the heating mode is greater than the fourth preset temperature difference and less than or equal to the fifth preset temperature difference;

[0047] The second defrosting start condition includes the temperature difference between the initial temperature of the outdoor heat exchanger and the current temperature of the outdoor heat exchanger in the heating mode being greater than the fifth preset temperature difference;

[0048] Wherein, the third preset temperature difference is less than the fourth preset temperature difference, and the fourth preset temperature difference is less than the fifth preset temperature difference.

[0049] In one embodiment, after the steps of controlling the reversing assembly to switch from the first state to the second state to connect the compressor's exhaust port to the outdoor heat exchanger and the compressor's return port to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening, the method further includes:

[0050] When the air conditioner meets the defrost exit conditions, control the reversing assembly to switch from the second state to the first state, and control the electronic expansion valve to operate at a throttling opening.

[0051] The defrosting exit condition includes the outdoor heat exchanger temperature being greater than or equal to the second preset temperature.

[0052] In addition, to achieve the above objectives, this application also proposes an air conditioner, which includes a refrigerant system, wherein the refrigerant system includes an indoor heat exchanger, a first throttling component and an outdoor heat exchanger connected in sequence, and the first throttling component is connected in parallel with an electronic expansion valve;

[0053] The electronic expansion valve is configured to operate at a throttling opening in heating mode and at a defrosting opening greater than the throttling opening when the first defrosting start condition is met in heating mode. In heating mode, the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state.

[0054] In one embodiment, the air conditioner further includes a control device, the refrigerant system being connected to the control device, the control device including: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the air conditioner as described above.

[0055] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the air conditioner control method described above.

[0056] The one or more technical solutions proposed in this application have at least the following technical effects: The air conditioner of this solution is equipped with an electronic expansion valve connected in parallel with the first throttling component. During the heating process of the air conditioner, the electronic expansion valve can cooperate with the first throttling component to throttle the flow. When the air conditioner needs to defrost, the amount of refrigerant flowing into the outdoor heat exchanger after condensation in the system can be increased by increasing the opening of the electronic expansion valve, thereby increasing the temperature of the refrigerant flowing into the outdoor heat exchanger and releasing heat for defrosting. Meanwhile, the indoor heat exchanger can remain in the condensing state to maintain indoor heating. During this defrosting process, the air conditioner does not need to switch the reversing component, and the compressor does not need to be stopped, which is beneficial to extending its service life. Thus, the indoor comfort during the defrosting process is improved while extending the life of the compressor. Attached Figure Description

[0057] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0058] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 This is a schematic diagram of the refrigerant system structure of an air conditioner according to an embodiment of this application;

[0060] Figure 2 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the control method of the air conditioner in this application embodiment;

[0061] Figure 3 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to this application.

[0062] Figure 4 This is a flowchart illustrating the second embodiment of the control method for the air conditioner in this application.

[0063] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0064] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0065] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0066] The main solution of this application embodiment is: a control method based on an air conditioner, the air conditioner including a refrigerant system, the refrigerant system including an indoor heat exchanger, a first throttling component and an outdoor heat exchanger connected in sequence, the first throttling component being connected in parallel with an electronic expansion valve, the method including: controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state; controlling the electronic expansion valve to operate at a throttling opening; when the air conditioner meets the first defrosting start condition, controlling the electronic expansion valve to operate at a defrosting opening greater than the throttling opening to defrost the outdoor heat exchanger.

[0067] In this embodiment, for ease of description, the following description uses an air conditioner as the subject of execution.

[0068] In existing technology, defrosting is generally achieved by switching the outdoor heat exchanger to a condensing state through a reversing component in the air conditioner. However, the compressor needs to be stopped during the reversing process, which can easily lead to frequent compressor start-stop and affect its lifespan. During the defrosting process, the indoor heat exchanger is in an evaporating state, which will cause it to stop releasing heat to the room, affecting indoor comfort.

[0069] This application provides the above-mentioned solution, in which an electronic expansion valve is installed in the air conditioner in parallel with the first throttling component. During the heating process of the air conditioner, the electronic expansion valve can cooperate with the first throttling component to throttle the flow. When the air conditioner needs to defrost, the opening of the electronic expansion valve can be increased to increase the amount of refrigerant flowing into the outdoor heat exchanger after condensation in the system. This raises the temperature of the refrigerant flowing into the outdoor heat exchanger, thereby releasing heat for defrosting. The indoor heat exchanger can remain in a condensed state to maintain indoor heating. During this defrosting process, there is no need for the reversing component to reverse in the air conditioner, and the compressor does not need to be stopped, which helps to extend its service life. Thus, it improves indoor comfort during the defrosting process while extending the life of the compressor. In particular, the parallel connection of the first throttling component and the electronic expansion valve, compared with the method of setting the electronic expansion valve alone, helps to ensure that the electronic expansion valve with a smaller flow rate can be used to achieve the same flow regulation effect. In addition to effectively reducing costs, the control accuracy can be effectively improved.

[0070] This application provides an air conditioner. The air conditioner may include wall-mounted air conditioners, cabinet air conditioners, window air conditioners, ceiling-mounted air conditioners, multi-split air conditioners, and other types of air conditioners.

[0071] In this embodiment, refer to Figure 1 The air conditioner includes a refrigerant system 200, which includes a compressor 1 and an indoor heat exchanger 3, a first throttling component 4 and an outdoor heat exchanger 6 connected in sequence. The first throttling component 4 is connected in parallel with an electronic expansion valve 5.

[0072] The electronic expansion valve 5 is configured to operate at a throttling opening in heating mode and at a defrosting opening greater than the throttling opening when the first defrosting start condition is met in heating mode. In heating mode, the indoor heat exchanger 3 is in a condensing state and the outdoor heat exchanger 6 is in an evaporating state.

[0073] The indoor heat exchanger 3 is equipped with an indoor fan 31, which drives indoor air to exchange heat with the indoor heat exchanger 3. The outdoor heat exchanger 6 is equipped with an outdoor fan 61, which drives outdoor air to exchange heat with the outdoor heat exchanger 6.

[0074] In this embodiment, the first throttling component 4 is a throttling tube, and the throttling opening is not adjustable. In this embodiment, the first throttling component 4 is configured to throttle in one direction from the indoor heat exchanger 3 to the outdoor heat exchanger 6, that is, the first throttling component 4 throttles when the refrigerant flows from the indoor heat exchanger 3 to the outdoor heat exchanger 6, and does not throttle when the refrigerant flows from the outdoor heat exchanger 6 to the indoor heat exchanger 3.

[0075] In one implementation, the refrigerant flow direction in the refrigerant system 200 is fixed, and the compressor 1's discharge port, indoor heat exchanger 3, first throttling component 4, and outdoor heat exchanger 6 are connected in sequence. The air conditioner's operating modes include at least:

[0076] In heating mode, when compressor 1 is turned on, electronic expansion valve 5 operates at a throttling opening, indoor heat exchanger 3 is in a condensing state and outdoor heat exchanger 6 is in an evaporating state, and indoor heat exchanger 3 releases heat to raise the indoor temperature.

[0077] In the preset defrosting mode, when the compressor 1 is turned on, the electronic expansion valve 5 operates at a defrosting opening greater than the throttling opening (e.g., the maximum opening). The indoor heat exchanger 3 is in a cooling state, while the outdoor heat exchanger 6 is in an evaporating state. The outdoor heat exchanger 6 releases heat to melt the frost.

[0078] In another implementation, the refrigerant flow direction in the refrigerant system 200 is switchable. The refrigerant system 200 also includes a reversing assembly 2 (e.g., a four-way valve). The exhaust port of the compressor 1, the return port of the compressor 1, the indoor heat exchanger 3, and the outdoor heat exchanger 6 are all connected to the reversing assembly 2. The reversing assembly 2 has a first state and a second state. When the reversing assembly 2 is running in the first state, the exhaust port of the compressor 1 is connected to the indoor heat exchanger 3, and the return port of the compressor 1 is connected to the outdoor heat exchanger 6. When the reversing assembly 2 is running in the second state, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 6, and the return port of the compressor 1 is connected to the indoor heat exchanger 3.

[0079] In this embodiment, the refrigerant system 200 further includes a refrigerant heat dissipation component 8 and a second throttling component 7. The refrigerant heat dissipation component 8 is configured to dissipate heat from the heat-generating component. The indoor heat exchanger 3, the second throttling component 7, the refrigerant heat dissipation component 8, and the first throttling component 4 are connected in sequence.

[0080] The refrigerant heat dissipation component 8 can be connected to the heat-generating components in the air conditioner (such as the electronic control board) for heat exchange, and can use the condensed refrigerant to dissipate heat from the heat-generating components.

[0081] The second throttling component 7 is a throttling tube, and its throttling opening is not adjustable. In this embodiment, the second throttling component 7 is configured to throttle in one direction from the outdoor heat exchanger 6 to the indoor heat exchanger 3. That is, the second throttling component 7 throttles when the refrigerant flows from the outdoor heat exchanger 6 to the indoor heat exchanger 3, and does not throttle when the refrigerant flows from the indoor heat exchanger 3 to the outdoor heat exchanger 6.

[0082] The first throttling component 4 and the second throttling component 7 are configured as unidirectional throttling components, which can ensure that the temperature of the refrigerant flowing into the heat dissipation component 8 will not be too low regardless of how the refrigerant flow direction is switched, effectively preventing condensation on the heat-generating components.

[0083] Based on the coordination of the commutation component 2, the electronic expansion valve 5, the first throttling component 4, and the second throttling component 7, the operating modes of the air conditioner include at least:

[0084] In heating mode, the reversing component 2 operates in the first state, the electronic expansion valve 5 operates at the throttling opening, the first throttling component 4 is in the throttling state, and the second throttling component 7 is in the stopped throttling state. The refrigerant flowing out of the compressor 1 flows sequentially through the indoor heat exchanger 3, the second throttling component 7, the refrigerant heat dissipation component 8, the first throttling component 4 and the electronic expansion valve 5, and the outdoor heat exchanger 6 before flowing back to the compressor 1. The indoor heat exchanger 3 is in the condensing state, and the outdoor heat exchanger 6 is in the evaporating state. The indoor heat exchanger 3 can release heat to increase the indoor temperature.

[0085] In the first defrosting mode, the reversing assembly 2 operates in the first state, the electronic expansion valve 5 operates at a defrosting opening greater than the throttling opening (e.g., the maximum opening), the first throttling component 4 is in a throttling state, the second throttling component 7 is in a stopped throttling state, the indoor fan 31 operates at the first speed, and the refrigerant flowing out of the compressor 1 flows sequentially through the indoor heat exchanger 3, the second throttling component 7, the refrigerant heat dissipation assembly 8, the first throttling component 4 and the electronic expansion valve 5, and the outdoor heat exchanger 6 before flowing back to the compressor 1. The indoor heat exchanger 3 is in a condensing state, and the outdoor heat exchanger 6 is in a heat release state, which can release heat to melt frost.

[0086] In the second defrosting mode, the reversing assembly 2 operates in the first state, the electronic expansion valve 5 operates at a defrosting opening greater than the throttling opening (e.g., maximum opening), the first throttling component 4 is in a throttling state, the second throttling component 7 is in a stopped throttling state, the indoor fan 31 operates at the second speed or stops, and the refrigerant flowing from the compressor 1 flows sequentially through the indoor heat exchanger 3, the second throttling component 7, the refrigerant heat dissipation assembly 8, the first throttling component 4 and the electronic expansion valve 5, and the outdoor heat exchanger 6 before returning to the compressor 1. The indoor heat exchanger 3 is in a condensing state, and the outdoor heat exchanger 6 is in a heat-releasing state, releasing heat to melt frost. The second speed is less than the first speed mentioned above, and the heat released by the outdoor heat exchanger 6 in the second defrosting mode is greater than the heat released by the outdoor heat exchanger 6 in the first defrosting mode.

[0087] In the third defrosting mode, the reversing assembly 2 operates in the second state, the electronic expansion valve 5 operates at an opening greater than the throttling opening (e.g., the maximum opening), the first throttling component 4 is in the stopped throttling state, the second throttling component 7 is in the throttling state, and the refrigerant flowing out of the compressor 1 flows sequentially through the outdoor heat exchanger 6, the first throttling component 4 and the electronic expansion valve 5, the refrigerant heat dissipation assembly 8, the second throttling component 7 and the indoor heat exchanger 3 before flowing back to the compressor 1. The indoor heat exchanger 3 is in the evaporation state, and the outdoor heat exchanger 6 is in the condensation state. The outdoor heat exchanger 6 can release heat to melt the frost.

[0088] The frost thickness on the outdoor heat exchanger 6 in the first defrosting mode is less than that in the second defrosting mode, and the frost thickness on the outdoor heat exchanger 6 in the second defrosting mode is less than that in the third defrosting mode. The heat released by the outdoor heat exchanger 6 in the third defrosting mode is greater than that in the second defrosting mode, and the heat released by the outdoor heat exchanger 6 in the second defrosting mode is greater than that in the first defrosting mode.

[0089] When the air conditioner switches from heating mode to the first or second defrost mode, the reversing assembly 2 does not need to reverse, and the compressor 1 does not need to stop. When the air conditioner switches from heating mode to the third defrost mode, the reversing assembly 2 needs to reverse, and the compressor 1 needs to stop.

[0090] This embodiment proposes an air conditioner in which an electronic expansion valve 5 is connected in parallel with a first throttling component 4. During the heating process, the electronic expansion valve 5 can work with the first throttling component 4 to throttle the airflow. When defrosting is required, the opening of the electronic expansion valve 5 can be increased to increase the amount of refrigerant flowing into the outdoor heat exchanger 6 after condensation, thereby raising the temperature of the refrigerant flowing into the outdoor heat exchanger 6 and releasing heat for defrosting. Meanwhile, the indoor heat exchanger 3 can remain in a condensed state to maintain indoor heating. During this defrosting process, the air conditioner does not require the reversing component 2 to reverse, and the compressor 1 does not need to be stopped, which helps to extend its service life. This improves indoor comfort during the defrosting process while extending the life of the compressor 1. Compared to setting the electronic expansion valve 5 separately, connecting the first throttling component 4 in parallel with the electronic expansion valve 5 allows the use of an electronic expansion valve 5 with a smaller flow rate to achieve the same flow regulation effect. In addition to effectively reducing costs, the control accuracy can also be effectively improved.

[0091] In other embodiments, when the air conditioner is not equipped with the refrigerant heat dissipation component 8 and the second throttling component 7, the electronic expansion valve 5 can operate at a throttling opening in both heating and cooling modes.

[0092] The air conditioner also includes an environmental detection module 01, which can be located in the indoor environment and / or outdoor environment where the air conditioner is located, to detect environmental state parameters (such as at least one of the following: ambient temperature, ambient humidity, ambient enthalpy).

[0093] The air conditioner also includes an indoor temperature sensor 02, which is located in the indoor heat exchanger 3 to detect the temperature of the indoor heat exchanger 3.

[0094] The air conditioner also includes an outdoor temperature sensor 03, which is located on the outdoor heat exchanger 6 to detect the temperature of the outdoor heat exchanger 6.

[0095] Reference Figure 2 The air conditioner also includes a control device 100, and the aforementioned refrigerant system 200, environmental detection module 01, indoor temperature sensor 02 and outdoor temperature sensor 03 are all connected to the control device 100.

[0096] The control device 100 includes: at least one processor 1001; and a memory 1002 communicatively connected to the at least one processor 1001, and a timer 1003, etc.; wherein the memory 1002 stores instructions that can be executed by the at least one processor 1001, the instructions being executed by the at least one processor 1001 to enable the at least one processor 1001 to perform the air conditioner control method in the following embodiment.

[0097] The following is for reference. Figure 2The diagram illustrates a structural schematic of a control device 100 suitable for implementing embodiments of this application. The air conditioner in these embodiments may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 2 The control device 100 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0098] like Figure 2 As shown, the control device 100 may include a processor 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in memory 1002. The program in memory 1002 may be a program in read-only memory (ROM) or a program loaded from a storage device into random access memory (RAM). The RAM also stores various programs and data required for the operation of the control device 100. The processor 1001 and memory 1002 (ROM and RAM) are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus. Typically, the following systems can be connected to the I / O interface: input devices including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices including, for example, magnetic tapes, hard disks, etc.; and communication devices. The communication device allows the control device 100 to communicate wirelessly or wiredly with other devices to exchange data. Although the control unit 100 with various systems is shown in the figure, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have alternatively.

[0099] Specifically, according to the embodiments disclosed in this application, the method flow described in the following embodiments can be implemented as a computer software program. For example, the embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from memory 1002. When the computer program is executed by processor 1001, it performs the functions defined in the control method of the air conditioner of the embodiments disclosed in this application.

[0100] The air conditioner provided in this application, employing the control method described in the following embodiments, solves the technical problem of how to improve indoor comfort during the defrosting process while extending the compressor's lifespan. Compared to the prior art, the beneficial effects of the air conditioner provided in this application are the same as those of the control method described in the following embodiments, and other technical features of this air conditioner are the same as those disclosed in the method of the following embodiments, and will not be repeated here.

[0101] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or air conditioner capable of performing the above functions. The following description uses an air conditioner as an example to illustrate this embodiment and the subsequent embodiments.

[0102] Based on this, the embodiments of this application provide a control method for an air conditioner, referring to... Figure 3 , Figure 3 This is a flowchart illustrating the first embodiment of the control method for the air conditioner of this application.

[0103] In this embodiment, the control method of the air conditioner includes steps S10 to S20:

[0104] Step S10: Control the air conditioner to operate in heating mode so that the indoor heat exchanger is in condensation state and the outdoor heat exchanger is in evaporation state, and control the electronic expansion valve to operate at a throttling opening.

[0105] When the air conditioner is running in heating mode, the compressor is on. When the air conditioner is equipped with a commutator, the commutator operates in its first state. When the air conditioner is equipped with a second throttling component and a refrigerant heat dissipation component, the second throttling component is in a stopped throttling state.

[0106] During operation at the throttling opening, the electronic expansion valve, together with the first throttling component, throttles the refrigerant condensed in the indoor heat exchanger. The throttled refrigerant then evaporates in the outdoor heat exchanger to absorb heat.

[0107] The throttling setting can be determined based on the actual operating conditions during the air conditioner's heating mode.

[0108] In this embodiment, the reversing component operates in the first state in the heating mode, the electronic expansion valve operates at the throttling opening, the first throttling component is in the throttling state, the second throttling component is in the stopped throttling state, the refrigerant flowing out of the compressor flows sequentially through the indoor heat exchanger, the second throttling component, the refrigerant heat dissipation component, the first throttling component and the electronic expansion valve, and the outdoor heat exchanger before flowing back to the compressor. The indoor heat exchanger is in the condensing state, the outdoor heat exchanger is in the evaporating state, and the indoor heat exchanger can release heat to increase the indoor temperature.

[0109] Step S20: When the air conditioner meets the first defrost start condition, control the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger.

[0110] The first defrosting start condition is the condition that the air conditioner's own state parameters (such as outdoor heat exchanger temperature, indoor heat exchanger temperature, exhaust superheat, return superheat, etc.) and / or the environmental parameters of the environment where the air conditioner is located (such as outdoor temperature, outdoor humidity, outdoor enthalpy, etc.) must meet when the outdoor heat exchanger is frosted.

[0111] In this embodiment, the first defrosting start condition includes either the first start condition corresponding to the first defrosting mode or the second start condition corresponding to the second defrosting mode. That is, when the air conditioner meets the first start condition, the electronic expansion valve is controlled to increase from the throttling opening to the defrosting opening; or when the air conditioner meets the second start condition, the electronic expansion valve is controlled to increase to the defrosting opening.

[0112] In this embodiment, the defrosting opening is an opening that does not have a throttling effect, such as the maximum opening of an electronic expansion valve. In other embodiments, the defrosting opening may also be an opening that is larger than the throttling opening but smaller than the maximum opening.

[0113] The defrost opening can be a preset fixed opening, or it can be determined according to the defrost mode corresponding to the defrost dynamic conditions met by the air conditioner, or it can be determined according to the actual frosting state of the outdoor heat exchanger. For example, the defrost opening can be determined based on the temperature of the outdoor heat exchanger and / or the pressure difference across the first throttling component.

[0114] In one implementation, when the first defrosting mode is met and the first start-up condition is met, the reversing component operates in a first state, the electronic expansion valve operates at a defrosting opening greater than the throttling opening (e.g., the maximum opening), the first throttling component is in a throttling state, the second throttling component is in a stopped throttling state, the indoor fan operates at a first speed, and the refrigerant flowing out of the compressor flows sequentially through the indoor heat exchanger, the second throttling component, the refrigerant heat dissipation component, the first throttling component and the electronic expansion valve, and the outdoor heat exchanger before returning to the compressor. The indoor heat exchanger is in a condensing state, the outdoor heat exchanger is in a heat release state, and the outdoor heat exchanger can release heat to melt frost.

[0115] In another implementation, when the second start-up condition corresponding to the second defrosting mode is met, the reversing assembly operates in the first state, the electronic expansion valve operates at a defrosting opening greater than the throttling opening (e.g., maximum opening), the first throttling component is in a throttling state, the second throttling component is in a stopped throttling state, the indoor fan operates at the second speed or stops, and the refrigerant flowing from the compressor flows sequentially through the indoor heat exchanger, the second throttling component, the refrigerant heat dissipation component, the first throttling component and the electronic expansion valve, and the outdoor heat exchanger before returning to the compressor. The indoor heat exchanger is in a condensing state, and the outdoor heat exchanger is in a heat-releasing state, releasing heat to melt frost. The second speed is less than the first speed mentioned above, and the heat released by the outdoor heat exchanger in the second defrosting mode is greater than the heat released by the outdoor heat exchanger in the first defrosting mode.

[0116] This embodiment provides a control method for an air conditioner. The air conditioner includes an electronic expansion valve connected in parallel with a first throttling component. During heating, the electronic expansion valve works in conjunction with the first throttling component to reduce flow. When defrosting is required, the opening of the electronic expansion valve increases the amount of refrigerant flowing into the outdoor heat exchanger after condensation, raising the temperature of the refrigerant flowing into the outdoor heat exchanger and releasing heat for defrosting. Meanwhile, the indoor heat exchanger remains in a condensed state to maintain indoor heating. This defrosting process eliminates the need for reversing components in the air conditioner, and the compressor does not need to stop, thus extending its service life. This improves indoor comfort during defrosting while extending the compressor's lifespan. Compared to using a separate electronic expansion valve, connecting the first throttling component in parallel with the electronic expansion valve allows for the use of a smaller flow rate electronic expansion valve to achieve the same flow regulation effect. This not only effectively reduces costs but also significantly improves control accuracy.

[0117] Based on any of the above embodiments, in the second embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Furthermore, prior to the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger when the air conditioner meets the first defrost start condition, the method further includes:

[0118] Control the indoor fan corresponding to the indoor heat exchanger to reduce its speed; and / or,

[0119] Control the compressor in the refrigerant system to reduce its frequency; and / or,

[0120] The outdoor fan corresponding to the outdoor heat exchanger is controlled to operate at or be turned off at a defrosting speed, wherein the defrosting speed is less than the heating speed of the outdoor fan in the heating mode.

[0121] When the indoor fan slows down, it can continuously reduce its speed to the defrost speed, or it can reduce its speed in stages to the defrost speed. The defrost speed can be a preset fixed speed, or it can be a speed determined according to the actual operating conditions of the air conditioner. For example, the defrost speed can be determined based on the temperature of the outdoor heat exchanger and / or the temperature of the indoor heat exchanger when the air conditioner meets the first defrost start conditions.

[0122] When the compressor frequency is reduced, it can be continuously reduced to the defrost frequency, or it can be reduced to the defrost frequency in stages. The defrost frequency can be lower than the minimum frequency in heating mode. The defrost frequency can be a preset fixed frequency, or it can be determined according to the actual operating conditions of the air conditioner, such as the exhaust superheat of the indoor fan when it is running at defrost speed and the temperature difference between the refrigerant flowing into and out of the indoor heat exchanger.

[0123] When the outdoor fan is running at defrost speed, the defrost speed can be a preset fixed speed or a speed determined according to the actual operating conditions of the air conditioner, such as the outdoor ambient temperature and / or the outdoor heat exchanger temperature. The outdoor fan's defrost speed can be controlled or shut down based on status parameters, which indicate whether there is sufficient heat in the outdoor environment.

[0124] In this embodiment, before the electronic expansion valve is increased to the defrost opening, the indoor fan speed is reduced to help store heat for the defrost process after the electronic expansion valve is increased; the compressor operates at a lower frequency to help avoid excessively high indoor heat exchanger temperature and improve the reliability of defrost operation; the outdoor fan operates at the defrost speed to enhance convection and utilize ambient heat for defrosting, thereby improving defrost efficiency; the outdoor fan is turned off to avoid the impact of low temperature environment on defrost efficiency, thereby improving defrost efficiency.

[0125] In other embodiments, the electronic expansion valve and the aforementioned components may also operate simultaneously when the first defrosting start condition is met.

[0126] In one feasible implementation, refer to Figure 4 If step S204 is defined as the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger, then steps S201 to S203 are included before step S204:

[0127] Step S201: When the air conditioner meets the first defrosting start condition, control the indoor fan to reduce its speed;

[0128] Step S202: If the temperature of the indoor heat exchanger is greater than the first preset temperature, control the compressor to reduce its frequency.

[0129] The temperature of the indoor heat exchanger is detected when the indoor fan reduces to the defrost speed and maintains the defrost speed for a set period of time.

[0130] The first preset temperature is the minimum temperature that the indoor heat exchanger needs to reach when defrosting and heat storage are complete. If the temperature of the indoor heat exchanger is higher than the first preset temperature, it means that defrosting and heat storage are complete; if the temperature of the indoor heat exchanger is lower than or equal to the first preset temperature, it means that defrosting and heat storage are not complete.

[0131] Step S203: Control the outdoor fan corresponding to the outdoor heat exchanger to run at defrost speed or shut down.

[0132] In this embodiment, the indoor fan first reduces its speed, and then the compressor reduces its frequency after defrosting and heat storage are completed. This helps to improve heat storage efficiency and avoids the indoor heat exchanger from becoming too hot after heat storage, which could affect reliability. After the compressor reduces its frequency, the outdoor fan is controlled to reduce its speed or be turned off. This helps to avoid the outdoor convection being too small during the heat storage process, which could worsen the degree of frost formation on the outdoor heat exchanger. Based on this, controlling the operation of each component in the above sequence helps to improve the defrosting effect while ensuring system reliability.

[0133] In other embodiments, the above-mentioned components may also operate simultaneously, or the compressor may be controlled to reduce its frequency first, then the indoor fan may be controlled to reduce its speed, and then the outdoor fan may be controlled to reduce its speed or be turned off.

[0134] In one feasible implementation, the step of controlling the outdoor fan corresponding to the outdoor heat exchanger to operate at the defrost speed or to shut down includes: obtaining the outdoor temperature of the environment where the air conditioner is located; controlling the outdoor fan to operate at the defrost speed when the outdoor temperature is greater than a preset ambient temperature; and controlling the outdoor fan to shut down when the outdoor temperature is less than or equal to the preset ambient temperature.

[0135] The preset ambient temperature is a critical value used to distinguish whether there is sufficient heat in the outdoor environment.

[0136] In this embodiment, when the outdoor temperature is higher than the preset ambient temperature, it indicates that the outdoor temperature is sufficient. At this time, the outdoor fan operates at the defrosting speed, which helps to ensure sufficient convection to utilize the heat from the outdoor environment for defrosting. This, combined with the adjustment of the electronic expansion valve opening, effectively improves defrosting efficiency. When the outdoor temperature is lower than or equal to the preset ambient temperature, it indicates that the outdoor temperature is insufficient. At this time, the outdoor fan is turned off to prevent the cold air from the outdoor environment from affecting the defrosting effect, thus effectively improving defrosting efficiency.

[0137] In one feasible implementation, the first defrosting start condition includes a first start condition corresponding to a first defrosting mode or a second start condition corresponding to a second defrosting mode, wherein the frost thickness of the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness of the outdoor heat exchanger corresponding to the second defrosting mode, and the step of controlling the indoor fan to reduce its speed when the air conditioner meets the first defrosting start condition includes: controlling the indoor fan to operate at a first speed when the air conditioner meets the first start condition; and controlling the indoor fan to operate at a second speed or turn off when the air conditioner meets the second start condition; wherein the first speed is greater than the second speed.

[0138] When the air conditioner meets the second start-up condition, the indoor fan can be controlled to operate at a second speed or shut down based on the temperature of the indoor heat exchanger and / or the temperature of the outdoor heat exchanger. The indoor fan can be controlled to operate at the second speed when the temperature of the indoor heat exchanger is greater than a first temperature threshold and the temperature of the outdoor heat exchanger is greater than a second temperature threshold; the indoor fan can be controlled to shut down when the temperature of the indoor heat exchanger is less than or equal to the first temperature threshold or the temperature of the outdoor heat exchanger is less than or equal to the second temperature threshold.

[0139] In this embodiment, when the frost thickness on the outdoor heat exchanger is small, the outdoor fan is reduced to a higher speed, which helps to ensure the defrosting effect while further improving indoor comfort; when the frost thickness on the outdoor heat exchanger is large, the outdoor fan is reduced to a lower speed, which helps to reduce excessive indoor heat output and improve the defrosting effect.

[0140] Based on any of the above embodiments, in the third embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, after the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger when the air conditioner meets the first defrost start condition, the method further includes:

[0141] When the air conditioner meets the defrost exit conditions, the air conditioner is controlled to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and the electronic expansion valve is controlled to operate at a throttling opening.

[0142] The defrosting exit conditions include the outdoor heat exchanger temperature being greater than or equal to the second preset temperature, and / or the electronic expansion valve operating at an increased opening for a duration greater than or equal to the first preset duration.

[0143] The first preset duration is the maximum allowed defrosting time when the indoor temperature drop during the defrosting process is less than the preset value.

[0144] The second preset temperature is the minimum temperature that the outdoor heat exchanger needs to reach when the frost on it is completely melted. A temperature greater than or equal to the second preset temperature indicates that the frost on the outdoor heat exchanger has melted; a temperature less than the second preset temperature indicates that the frost on the outdoor heat exchanger has not completely melted.

[0145] In this embodiment, the air conditioner promptly resumes heating operation when the defrosting exit conditions are met, which helps to further improve indoor comfort.

[0146] In other embodiments, the defrosting exit condition may also include the temperature difference between the outdoor heat exchanger and the outdoor temperature being less than a preset value.

[0147] In one feasible implementation, the defrosting exit condition corresponding to the first defrosting mode includes the temperature of the outdoor heat exchanger being greater than or equal to the second preset temperature, and the defrosting exit condition corresponding to the second defrosting mode includes a first exit condition or a second exit condition. The first exit condition includes the electronic expansion valve operating at the increased opening for a duration greater than or equal to the first preset duration, and the second exit condition includes the electronic expansion valve operating at the increased opening for a duration less than the first preset duration and the temperature of the outdoor heat exchanger being greater than or equal to the second preset temperature.

[0148] In this embodiment, the defrosting effect can be effectively improved regardless of the thickness of the frost layer on the outdoor heat exchanger, as described above.

[0149] In one feasible implementation, the refrigerant system further includes a compressor, a reversing assembly, a second throttling component, and a refrigerant heat dissipation assembly. The refrigerant heat dissipation assembly is configured to dissipate heat from the heat-generating components. The indoor heat exchanger, the second throttling component, the refrigerant heat dissipation assembly, and the first throttling component are connected in sequence. The compressor, the indoor heat exchanger, and the outdoor heat exchanger are all connected to the reversing assembly.

[0150] The step of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state includes: controlling the reversing assembly to operate in a first state so that the exhaust port of the compressor is connected to the indoor heat exchanger and the return port of the compressor is connected to the outdoor heat exchanger.

[0151] When the air conditioner meets the second exit condition, after the steps of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, the method further includes: when the air conditioner meets the second start condition, controlling the reversing assembly to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening.

[0152] After the commutator switches from the first state to the second state, the air conditioner operates in the third defrosting mode described above, with the outdoor heat exchanger in a condensing state to release heat for defrosting. The electronic expansion valve operates at an opening greater than the throttling opening (e.g., the maximum opening or an opening determined based on the temperature of the refrigerant heat dissipation components), which helps to prevent condensation on the refrigerant heat dissipation components.

[0153] In this embodiment, when the outdoor heat exchanger has a thick layer of frost, if the second defrosting mode is used to defrost, and the defrosting process is stopped due to excessive time, it indicates that there is a risk that the outdoor heat exchanger has not been completely defrosted. Subsequently, when the air conditioner meets the second start-up condition again, the defrosting mode that is started is no longer the second defrosting mode, but the aforementioned third defrosting mode is used for reverse defrosting. This helps to ensure that the outdoor heat exchanger has sufficient heat to melt the frost completely, avoiding the possibility of frost residue when using the aforementioned second defrosting mode, which would cause the air conditioner to frequently start defrosting. This helps to improve the defrosting effect, extend the heating cycle, and ensure indoor thermal comfort.

[0154] Based on any of the above embodiments, in the fourth embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. In addition, the refrigerant system further includes a compressor, a reversing assembly, a second throttling component, and a refrigerant heat dissipation assembly. The refrigerant heat dissipation assembly is configured to dissipate heat from the heat-generating components. The indoor heat exchanger, the second throttling component, the refrigerant heat dissipation assembly, and the first throttling component are connected in sequence.

[0155] The step of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state includes: controlling the reversing assembly to operate in a first state so that the exhaust port of the compressor is connected to the indoor heat exchanger and the return port of the compressor is connected to the outdoor heat exchanger.

[0156] After the steps of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, the method further includes: when the air conditioner meets the second defrosting start condition, controlling the reversing assembly to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening;

[0157] Wherein, the frost thickness of the outdoor heat exchanger indicated by the second defrost start condition is greater than the frost thickness of the outdoor heat exchanger indicated by the first defrost start condition.

[0158] The first defrosting start condition is the condition that the air conditioner's own state parameters and / or the environmental parameters of the environment in which the air conditioner is located must meet when the outdoor heat exchanger is frosted and the frost thickness is less than or equal to a preset thickness. The second defrosting start condition is the condition that the air conditioner's own state parameters and / or the environmental parameters of the environment in which the air conditioner is located must meet when the outdoor heat exchanger is frosted and the frost thickness is greater than a preset thickness.

[0159] In this embodiment, the determination of whether the first or second defrost start condition is met is based on the initial temperature of the outdoor heat exchanger in heating mode and its current temperature. Here, the initial temperature is the lowest temperature of the outdoor heat exchanger within a preset time after the heating mode is activated. The determination of whether the air conditioner meets the first or second defrost start condition is based on the magnitude of the relationship or temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger. In this embodiment, the first defrosting start condition includes a first start condition corresponding to a first defrosting mode or a second start condition corresponding to a second defrosting mode, wherein the frost thickness of the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness of the outdoor heat exchanger corresponding to the second defrosting mode; the first start condition includes a temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger in the heating mode that is greater than or equal to a third preset temperature difference and less than or equal to a fourth preset temperature difference; the second start condition includes a temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger in the heating mode that is greater than the fourth preset temperature difference and less than or equal to a fifth preset temperature difference; the second defrosting start condition includes a temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger in the heating mode that is greater than the fifth preset temperature difference; wherein the third preset temperature difference is less than the fourth preset temperature difference, and the fourth preset temperature difference is less than the fifth preset temperature difference. Based on this, the thickness of the frost on the outdoor heat exchanger can be accurately identified by the temperature change of the outdoor heat exchanger. When the frost on the outdoor heat exchanger is thin, the first defrosting mode without reversing of the reversing component is used. When the frost on the outdoor heat exchanger is moderate, the second defrosting mode without reversing of the reversing component is used. When the frost on the outdoor heat exchanger is thick, the third defrosting mode with reversing of the reversing component is used.

[0160] In this embodiment, by using the above method, a non-reversing defrosting method is used when the degree of frost is not high, and a reversing defrosting method is used when the degree of frost is high. This can ensure the defrosting effect while reducing the number of reversing defrostings, thereby effectively extending the life of the compressor and improving indoor comfort during the defrosting process.

[0161] In other embodiments, the outdoor ambient temperature and the outdoor heat exchanger temperature can be used to determine whether the air conditioner meets the first defrost start condition and the second defrost start condition.

[0162] In one feasible implementation, after the steps of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, the method further includes:

[0163] The system obtains the outdoor temperature of the environment where the air conditioner is located and the initial temperature of the outdoor heat exchanger; when the temperature difference between the outdoor temperature and the initial temperature is greater than a second preset temperature difference, the system controls the reversing assembly to operate in a second state so that the exhaust port of the compressor is connected to the outdoor heat exchanger and the return port of the compressor is connected to the indoor heat exchanger, and controls the electronic expansion valve to operate at an opening greater than the throttling opening.

[0164] When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset time, and when the air conditioner meets the first defrost start condition, the electronic expansion valve is controlled to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger.

[0165] When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset duration, and when the air conditioner meets the second defrosting start condition, the reversing component is controlled to switch from the first state to the second state so that the exhaust port of the compressor is connected to the outdoor heat exchanger and the return port of the compressor is connected to the indoor heat exchanger, and the electronic expansion valve is controlled to operate at an opening greater than the throttling opening.

[0166] The initial temperature of the outdoor heat exchanger is the lowest temperature of the outdoor heat exchanger within a preset time after the air conditioner is turned on and running in heating mode.

[0167] Specifically, if the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, and the continuous running time of the heating mode is less than the second preset time, the air conditioner is controlled to maintain the operation of the heating mode.

[0168] In this embodiment, if the temperature difference between the outdoor temperature and the initial temperature is greater than the second preset temperature difference, it indicates that the air conditioner frosts during the start-up phase of the heating mode. Since the system originally had insufficient heat available for defrosting, the reversing defrosting method is used to defrost the outdoor heat exchanger, which helps to ensure clean defrosting, extend the subsequent heating cycle, and improve indoor comfort. If the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, it indicates that the air conditioner does not frost during the heating start-up phase. Subsequently, when the first or second defrosting start-up conditions are met, the reversing defrosting method or the non-reversing defrosting method is appropriately selected to effectively ensure the defrosting effect and improve indoor comfort.

[0169] In one feasible embodiment, after the step of obtaining the outdoor temperature of the environment where the air conditioner is located and the initial temperature of the outdoor heat exchanger, the method further includes:

[0170] When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset time, when the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger is less than the third preset temperature difference and the temperature of the indoor heat exchanger is less than or equal to the third preset temperature, the electronic expansion valve is controlled to reduce its opening.

[0171] When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset duration, when the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger is greater than the third preset temperature difference, and the air conditioner meets the first defrost start condition, the electronic expansion valve is controlled to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger; when the air conditioner meets the second defrost start condition, the reversing assembly is controlled to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and the electronic expansion valve is controlled to operate at an opening greater than the throttling opening.

[0172] The third preset temperature difference is a critical value used to distinguish whether there is a risk of frost formation on the outdoor heat exchanger. The third preset temperature difference here is the same concept as the third preset temperature difference mentioned above.

[0173] Based on the outdoor temperature and initial temperature, when the air conditioner is in the heating start-up phase without defrosting, if the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger is less than the third preset temperature difference, it indicates that there is no risk of frost formation on the outdoor heat exchanger, and the air conditioner can maintain heating operation. Furthermore, if the indoor heat exchanger temperature is too low, the opening of the electronic expansion valve can be reduced to effectively raise the indoor heat exchanger temperature, ensuring sufficient heating capacity to improve heating efficiency. If the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger is greater than or equal to the third preset temperature difference, further defrosting start-up conditions met by the air conditioner will be used to select whether to perform reversing defrosting or not, thereby ensuring the accuracy of defrosting control and achieving a balance between indoor comfort and effective defrosting.

[0174] In one feasible implementation, after the steps of controlling the commutation assembly to switch from the first state to the second state to connect the compressor's exhaust port to the outdoor heat exchanger and the compressor's return port to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening, the method further includes: when the air conditioner meets the defrosting exit condition, controlling the commutation assembly to switch from the second state to the first state, and controlling the electronic expansion valve to operate at the throttling opening; wherein, the defrosting exit condition includes the temperature of the outdoor heat exchanger being greater than or equal to the second preset temperature.

[0175] Based on this, the defrosting process can be promptly determined by the temperature of the outdoor heat exchanger after the air conditioner switches to defrost mode, and heating operation can be resumed in a timely manner, thereby reducing indoor heat loss and improving indoor comfort.

[0176] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the control method of the air conditioner in this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0177] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the air conditioner control method of the above embodiments.

[0178] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0179] The aforementioned computer-readable storage medium may be included in the air conditioner; or it may exist independently and not be installed in the air conditioner.

[0180] The aforementioned computer-readable storage medium carries one or more programs that, when executed by the air conditioner, cause the air conditioner to perform the following process: controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state; controlling the electronic expansion valve to operate at a throttling opening; and, when the air conditioner meets the first defrosting start condition, controlling the electronic expansion valve to operate at a defrosting opening greater than the throttling opening to defrost the outdoor heat exchanger.

[0181] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0182] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the control method of the air conditioner described above. This solves the technical problem of how to improve indoor comfort during the defrosting process while extending the lifespan of the compressor. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the control method of the air conditioner provided in the above embodiments, and will not be repeated here.

[0183] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0184] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. Modules described in the embodiments of this application can be implemented in software or hardware. The names of modules do not necessarily limit the specific unit itself. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0185] The above descriptions are merely some embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the content of this specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application. Therefore, the protection scope of this application should be determined by the scope of the claims.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes a refrigerant system, which includes an indoor heat exchanger, a first throttling component, and an outdoor heat exchanger connected in sequence. The first throttling component is connected in parallel with an electronic expansion valve. The method includes: The air conditioner is controlled to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and the electronic expansion valve is controlled to operate at a throttling opening. When the air conditioner meets the first defrost start condition, the electronic expansion valve is controlled to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger.

2. The method as described in claim 1, characterized in that, Before the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger when the air conditioner meets the first defrost start condition, the method further includes: Control the indoor fan corresponding to the indoor heat exchanger to reduce its speed; and / or, Control the compressor in the refrigerant system to reduce its frequency; and / or, The outdoor fan corresponding to the outdoor heat exchanger is controlled to operate at or be turned off at a defrosting speed, wherein the defrosting speed is less than the heating speed of the outdoor fan in the heating mode.

3. The method as described in claim 2, characterized in that, Prior to the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger, the method further includes: When the air conditioner meets the first defrosting start condition, the indoor fan speed is reduced. If the temperature of the indoor heat exchanger is higher than the first preset temperature, the compressor frequency is reduced. Control the outdoor fan corresponding to the outdoor heat exchanger to operate at defrost speed or shut down.

4. The method as described in claim 3, characterized in that, The step of controlling the outdoor fan corresponding to the outdoor heat exchanger to operate at defrost speed or to shut down includes: Obtain the outdoor temperature of the environment where the air conditioner is located; When the outdoor temperature is higher than the preset ambient temperature, the outdoor fan is controlled to operate at the defrosting speed. When the outdoor temperature is less than or equal to the preset ambient temperature, the outdoor fan is controlled to shut down.

5. The method as described in claim 2, characterized in that, The first defrosting start condition includes a first start condition corresponding to a first defrosting mode or a second start condition corresponding to a second defrosting mode. The frost thickness on the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness on the outdoor heat exchanger corresponding to the second defrosting mode. The step of controlling the indoor fan to reduce its speed when the air conditioner meets the first defrosting start condition includes: When the air conditioner meets the first start-up condition, the indoor fan is controlled to reduce to a first speed. When the air conditioner meets the second start-up condition, the indoor fan is controlled to reduce to the second speed or be turned off. Wherein, the first rotational speed is greater than the second rotational speed.

6. The method as described in claim 1, characterized in that, After the step of controlling the electronic expansion valve to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger when the air conditioner meets the first defrost start condition, the method further includes: When the air conditioner meets the defrost exit conditions, the air conditioner is controlled to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and the electronic expansion valve is controlled to operate at a throttling opening. The defrosting exit conditions include the outdoor heat exchanger temperature being greater than or equal to the second preset temperature, and / or the electronic expansion valve operating at an increased opening for a duration greater than or equal to the first preset duration.

7. The method as described in claim 6, characterized in that, The first defrosting start condition includes a first start condition corresponding to a first defrosting mode or a second start condition corresponding to a second defrosting mode, wherein the frost thickness of the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness of the outdoor heat exchanger corresponding to the second defrosting mode. The defrosting exit condition corresponding to the first defrosting mode includes the outdoor heat exchanger temperature being greater than or equal to the second preset temperature. The defrosting exit condition corresponding to the second defrosting mode includes a first exit condition or a second exit condition. The first exit condition includes the electronic expansion valve operating at the increased opening for a duration greater than or equal to the first preset duration. The second exit condition includes the electronic expansion valve operating at the increased opening for a duration less than the first preset duration and the outdoor heat exchanger temperature being greater than or equal to the second preset temperature.

8. The method as described in claim 7, characterized in that, The refrigerant system also includes a compressor, a reversing assembly, a second throttling component, and a refrigerant heat dissipation assembly. The refrigerant heat dissipation assembly is configured to dissipate heat from the heat-generating components. The indoor heat exchanger, the second throttling component, the refrigerant heat dissipation assembly, and the first throttling component are connected in sequence. The compressor, the indoor heat exchanger, and the outdoor heat exchanger are all connected to the reversing assembly. The step of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state includes: controlling the reversing assembly to operate in a first state so that the exhaust port of the compressor is connected to the indoor heat exchanger and the return port of the compressor is connected to the outdoor heat exchanger. After the steps of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, when the air conditioner meets the second exit condition, the method further includes: when the air conditioner meets the second start condition, controlling the reversing assembly to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening.

9. The method according to any one of claims 1 to 8, characterized in that, The refrigerant system also includes a compressor, a reversing assembly, a second throttling component, and a refrigerant heat dissipation assembly. The refrigerant heat dissipation assembly is configured to dissipate heat from the heat-generating components. The indoor heat exchanger, the second throttling component, the refrigerant heat dissipation assembly, and the first throttling component are connected in sequence. The step of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state includes: controlling the reversing assembly to operate in a first state so that the exhaust port of the compressor is connected to the indoor heat exchanger and the return port of the compressor is connected to the outdoor heat exchanger. After the steps of controlling the air conditioner to operate in heating mode so that the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, the method further includes: when the air conditioner meets the second defrosting start condition, controlling the reversing assembly to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening; Wherein, the frost thickness of the outdoor heat exchanger indicated by the second defrost start condition is greater than the frost thickness of the outdoor heat exchanger indicated by the first defrost start condition.

10. The method as described in claim 9, characterized in that, After the steps of controlling the air conditioner to operate in heating mode to put the indoor heat exchanger in a condensing state and the outdoor heat exchanger in an evaporating state, and controlling the electronic expansion valve to operate at a throttling opening, the method further includes: Obtain the outdoor temperature of the environment where the air conditioner is located and the initial temperature of the outdoor heat exchanger; When the temperature difference between the outdoor temperature and the initial temperature is greater than the second preset temperature difference, the reversing assembly is controlled to operate in the second state so that the exhaust port of the compressor is connected to the outdoor heat exchanger and the return port of the compressor is connected to the indoor heat exchanger, and the electronic expansion valve is controlled to operate at an opening greater than the throttling opening. When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset duration, and when the air conditioner meets the first defrost start condition, the electronic expansion valve is controlled to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger; when the air conditioner meets the second defrost start condition, the reversing assembly is controlled to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and the electronic expansion valve is controlled to operate at an opening greater than the throttling opening.

11. The method as described in claim 10, characterized in that, After the step of obtaining the outdoor temperature of the environment where the air conditioner is located and the initial temperature of the outdoor heat exchanger, the method further includes: When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset time, when the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger is less than the third preset temperature difference and the temperature of the indoor heat exchanger is less than or equal to the third preset temperature, the electronic expansion valve is controlled to reduce its opening. When the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference, or when the temperature difference between the outdoor temperature and the initial temperature is less than or equal to the second preset temperature difference and the continuous running time of the heating mode is greater than or equal to the second preset duration, when the temperature difference between the initial temperature and the current temperature of the outdoor heat exchanger is greater than the third preset temperature difference, and the air conditioner meets the first defrost start condition, the electronic expansion valve is controlled to operate at a defrost opening greater than the throttling opening to defrost the outdoor heat exchanger; when the air conditioner meets the second defrost start condition, the reversing assembly is controlled to switch from the first state to the second state so that the compressor's exhaust port is connected to the outdoor heat exchanger and the compressor's return port is connected to the indoor heat exchanger, and the electronic expansion valve is controlled to operate at an opening greater than the throttling opening.

12. The method as described in claim 9, characterized in that, The first defrosting start condition includes a first start condition corresponding to a first defrosting mode or a second start condition corresponding to a second defrosting mode, wherein the frost thickness of the outdoor heat exchanger corresponding to the first defrosting mode is less than the frost thickness of the outdoor heat exchanger corresponding to the second defrosting mode. The first start-up condition includes the temperature difference between the initial temperature of the outdoor heat exchanger and the current temperature of the outdoor heat exchanger in the heating mode being greater than or equal to a third preset temperature difference and less than or equal to a fourth preset temperature difference. The second start-up condition includes that the temperature difference between the initial temperature of the outdoor heat exchanger and the current temperature of the outdoor heat exchanger in the heating mode is greater than the fourth preset temperature difference and less than or equal to the fifth preset temperature difference; The second defrosting start condition includes the temperature difference between the initial temperature of the outdoor heat exchanger and the current temperature of the outdoor heat exchanger in the heating mode being greater than the fifth preset temperature difference; Wherein, the third preset temperature difference is less than the fourth preset temperature difference, and the fourth preset temperature difference is less than the fifth preset temperature difference.

13. The method as described in claim 9, characterized in that, After the steps of controlling the reversing assembly to switch from the first state to the second state to connect the compressor's exhaust port to the outdoor heat exchanger and the compressor's return port to the indoor heat exchanger, and controlling the electronic expansion valve to operate at an opening greater than the throttling opening, the method further includes: When the air conditioner meets the defrost exit conditions, control the reversing assembly to switch from the second state to the first state, and control the electronic expansion valve to operate at a throttling opening. The defrosting exit condition includes the outdoor heat exchanger temperature being greater than or equal to the second preset temperature.

14. An air conditioner, characterized in that, The air conditioner includes a refrigerant system, which includes an indoor heat exchanger, a first throttling component, and an outdoor heat exchanger connected in sequence. The first throttling component is connected in parallel with an electronic expansion valve. The electronic expansion valve is configured to operate at a throttling opening in heating mode and at a defrosting opening greater than the throttling opening when the first defrosting start condition is met in heating mode. In heating mode, the indoor heat exchanger is in a condensing state and the outdoor heat exchanger is in an evaporating state.

15. The air conditioner as described in claim 14, characterized in that, The air conditioner further includes a control device, the refrigerant system being connected to the control device, the control device including: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the air conditioner as described in any one of claims 1 to 13.

16. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method for the air conditioner as described in any one of claims 1 to 13.

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