Air conditioner and its control method

Abstract

The present invention discloses an air conditioner and its control method. The air conditioner includes: a housing, a refrigerant circulation circuit, a refrigeration system, an outdoor heat exchanger, an indoor heat exchanger, an outdoor fan, an outdoor motor, an outdoor coil temperature sensor, an outdoor ambient temperature sensor, and a controller. The controller is configured to: in response to a self-cleaning instruction for the air conditioner, obtain the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, and control at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, so that a preset power module in the air conditioner is within a safe operating temperature range, which can improve the reliability of the operation of the preset power module and simultaneously achieve a good self-cleaning effect of the outdoor heat exchanger.

Description

Technical Field

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

[0002] When the air conditioner is operating, power devices in the air conditioner, such as IPM modules, silicon bridges, IGBT modules, etc., can only dissipate heat by natural convection through the radiator. As the outdoor ambient temperature rises, the time it takes for the temperature of the power device to reach its reliable temperature point of 85°C becomes shorter. When the air conditioner operates in the heating mode, the outdoor motor operates normally, and the wind generated by the outdoor fan can perform forced heat exchange on the power device, achieving the purpose of dissipating heat from the power device.

[0003] However, during the self-cleaning of the outdoor heat exchanger in a variable-frequency air conditioner, in order to make the outdoor heat exchanger frost, the controller of the air conditioner will control the outdoor motor to stop operating, causing the outdoor fan to stop rotating. Therefore, when the air conditioner performs self-cleaning of the outdoor heat exchanger, in order to ensure the self-cleaning effect of the outdoor heat exchanger, the temperature of the power device will exceed its reliable temperature point, especially in hot summer conditions, resulting in problems such as breakdown or burnout of the power device; and if the reliability of the power device is ensured, the self-cleaning time of the outdoor heat exchanger will be very short, and a good self-cleaning effect cannot be achieved. Therefore, how to achieve a good self-cleaning effect of the outdoor heat exchanger and ensure the reliability of the power device is an urgent problem to be solved. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the object of the present invention is to provide an air conditioner and a control method thereof.

[0005] An air conditioner proposed by the present invention includes: a housing; a refrigerant circulation circuit that circulates refrigerant in a circuit composed of a compressor, a condenser, an expansion valve, an evaporator, a four-way valve, and a pressure reducer; a refrigeration system that performs heat exchange between the refrigerant and indoor air in the compression refrigeration cycle of the refrigerant circulation circuit. The refrigeration system includes the compressor, and the compressor is used to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas and discharge it to the condenser; an outdoor heat exchanger and an indoor heat exchanger are arranged in the housing, and one of them works as the condenser and the other works as the evaporator; an outdoor fan is arranged in the housing and is used to generate an air flow of outdoor air passing through the outdoor heat exchanger to enable heat exchange between the refrigerant and the outdoor air; an outdoor motor is arranged in the housing and is used to drive the outdoor fan; an outdoor coil temperature sensor is used to detect the outdoor coil temperature; an outdoor ambient temperature sensor is used to detect the outdoor ambient temperature; the controller is configured to: in response to an instruction to turn on the self-cleaning of the air conditioner, obtain the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, and control at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, so that the preset power module in the air conditioner is within the safe operating temperature range.

[0006] In addition, the air conditioner according to the embodiment of the present invention may further have the following additional technical features:

[0007] Further, when controlling at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, the controller is specifically configured to: determine whether the outdoor ambient temperature does not exceed a first preset temperature or exceeds a second preset temperature; when the outdoor ambient temperature does not exceed the first preset temperature or exceeds the second preset temperature, control the outdoor motor to reverse at a first preset speed for a first preset time; when the outdoor ambient temperature exceeds the first preset temperature but does not exceed the second preset temperature, control at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to the operating voltage of the air conditioner; wherein, the first preset temperature is less than the second preset temperature.

[0008] Further, when controlling at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to the operating voltage of the air conditioner, the controller is specifically configured to: when the operating voltage exceeds the first preset voltage and does not exceed the second preset voltage, control the outdoor motor to reverse at the second preset speed for the second preset time; when the outdoor ambient temperature exceeds the first preset temperature and does not exceed the third preset temperature, and the operating voltage exceeds the second preset voltage but does not exceed the third preset voltage, control the compressor to operate at the first preset frequency, and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor according to the current first operating current and the current first outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the first preset temperature and does not exceed the third preset temperature, and the operating voltage exceeds the third preset voltage but does not exceed the fourth preset voltage, control the compressor to operate at the second preset frequency, and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor according to the current second operating current and the current second outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the third preset temperature and does not exceed the second preset temperature, and the operating voltage exceeds the second preset voltage but does not exceed the third preset voltage, control the compressor to operate at the third preset frequency, and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor according to the current third operating current and the current third outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the third preset temperature and does not exceed the second preset temperature, and the operating voltage exceeds the third preset voltage but does not exceed the fourth preset voltage, control the compressor to operate at the fourth preset frequency, and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor according to the current fourth operating current and the current fourth outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; wherein, the third preset frequency is less than the fourth preset frequency, the fourth preset frequency is less than the first preset frequency, and the first preset frequency is less than the second preset frequency; the third preset temperature is greater than the first preset temperature and less than the second preset temperature; the first preset voltage is less than the second preset voltage, the second preset voltage is less than the third preset voltage, and the third preset voltage is less than the fourth preset voltage.

[0009] Further, when controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current first operating current and the current first outdoor coil temperature, the controller is specifically configured as follows: when the first operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the first operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at a fifth preset frequency, and control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the first operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at a sixth preset frequency, and control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the fifth preset frequency is greater than the sixth preset frequency, and the second preset current is greater than the first preset current and less than the third preset current.

[0010] Further, when controlling the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, the controller is specifically configured as follows: when the duration that the first outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; when the first outdoor coil temperature exceeds the fourth preset temperature, or when the first outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue operating for a fourth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0011] Further, when controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current second operating current and the current second outdoor coil temperature, the controller is specifically configured as follows: when the second operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the second operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the seventh preset frequency, and control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the second operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the eighth preset frequency, and control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the seventh preset frequency is greater than the eighth preset frequency.

[0012] Further, when controlling the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, the controller is specifically configured as follows: when the duration that the second outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; when the second outdoor coil temperature exceeds the fourth preset temperature, or the second outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue running for the fifth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0013] Further, when controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current third operating current and the current third outdoor coil temperature, the controller is specifically configured as follows: when the third operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the third operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the ninth preset frequency, and control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the third operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the tenth preset frequency, and control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the ninth preset frequency is greater than the tenth preset frequency.

[0014] Further, when controlling the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, the controller is specifically configured as follows: when the duration for which the third outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; when the third outdoor coil temperature exceeds the fourth preset temperature, or when the third outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue running for a sixth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0015] Further, when controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current fourth operating current and the current fourth outdoor coil temperature, the controller is specifically configured as follows: when the fourth operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the fourth operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at an eleventh preset frequency, and control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the fourth operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at a twelfth preset frequency, and control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the eleventh preset frequency is greater than the twelfth preset frequency.

[0016] Further, when controlling the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, the controller is specifically configured as follows: when the duration for which the fourth outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; when the fourth outdoor coil temperature exceeds the fourth preset temperature, or when the fourth outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue running for a seventh preset time and then stop, so that the air conditioner enters the defrosting mode.

[0017] According to the air conditioner of the embodiment of the present invention, by responding to the self-cleaning instruction of the air conditioner, obtaining the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner, and controlling at least one of the rotation direction and speed of the outdoor motor and at least one of the operating frequency and duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner, it is possible to avoid the problem that the current temperature of the preset power module is too high and causes burnout or breakdown when the outdoor heat exchanger is self-cleaned without setting a temperature detection device for the preset power module, improve the reliability of the operation of the preset power module, and at the same time achieve a good self-cleaning effect of the outdoor heat exchanger.

[0018] In view of the above problems, the present invention also proposes a control method for an air conditioner, which is used for the air conditioner described in any of the above embodiments. The method includes the following steps: responding to the instruction to start the self-cleaning of the air conditioner, obtaining the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner; controlling at least one of the rotation direction and speed of the outdoor motor and at least one of the operating frequency and duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner, so that the preset power module in the air conditioner is within a safe operating temperature range.

[0019] According to the control method of the air conditioner of the embodiment of the present invention, by responding to the self-cleaning instruction of the air conditioner, obtaining the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner, and controlling at least one of the rotation direction and speed of the outdoor motor and at least one of the operating frequency and duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner, it is possible to avoid the problem that the current temperature of the preset power module is too high and causes burnout or breakdown when the outdoor heat exchanger is self-cleaned without setting a temperature detection device for the preset power module, improve the reliability of the operation of the preset power module, and at the same time achieve a good self-cleaning effect of the outdoor heat exchanger.

[0020] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0021] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0022] Figure 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;

[0023] Figure 2A flowchart for controlling an outdoor motor and a compressor according to at least one of an outdoor ambient temperature, an outdoor coil temperature, an operating voltage, and an operating current of an air conditioner according to an embodiment of the present invention;

[0024] Figure 3 A flowchart for controlling an outdoor motor and a compressor according to the operating voltage of an air conditioner according to an embodiment of the present invention;

[0025] Figure 4 A flowchart for controlling an outdoor motor and a compressor according to a current first operating current and a current first outdoor coil temperature according to an embodiment of the present invention;

[0026] Figure 5 A flowchart for controlling the rotation direction and speed of an outdoor motor according to a first outdoor coil temperature according to an embodiment of the present invention;

[0027] Figure 6 A flowchart for controlling an outdoor motor and a compressor according to a current second operating current and a current second outdoor coil temperature according to an embodiment of the present invention;

[0028] Figure 7 A flowchart for controlling the rotation direction and speed of an outdoor motor according to a second outdoor coil temperature according to an embodiment of the present invention;

[0029] Figure 8 A flowchart for controlling an outdoor motor and a compressor according to a current third operating current and a current third outdoor coil temperature according to an embodiment of the present invention;

[0030] Figure 9 A flowchart for controlling the rotation direction and speed of an outdoor motor according to a third outdoor coil temperature according to an embodiment of the present invention;

[0031] Figure 10 A flowchart for controlling an outdoor motor and a compressor according to a current fourth operating current and a current fourth outdoor coil temperature according to an embodiment of the present invention;

[0032] Figure 11 A flowchart for controlling the rotation direction and speed of an outdoor motor according to a fourth outdoor coil temperature according to an embodiment of the present invention;

[0033] Figure 12 A flowchart of a control method for an air conditioner according to an embodiment of the present invention. Detailed implementation manners

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0036] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, the air conditioner performs a refrigeration cycle by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0039] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0040] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in the low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. During the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0041] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger. The indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0042] The indoor heat exchanger and the outdoor heat exchanger serve as condensers or evaporators. When the indoor heat exchanger serves as a condenser, the air conditioner serves as a heater in the heating mode. When the indoor heat exchanger serves as an evaporator, the air conditioner serves as a cooler in the cooling mode.

[0043] The following refers to Figures 1-12 Describe the air conditioner and its control method according to an embodiment of the present invention.

[0044] Figure 1 It is a schematic structural diagram of an air conditioner according to an embodiment of the present invention. As Figure 1As shown in the figure, an air conditioner includes: a housing 10, a refrigerant circulation circuit 20, a refrigeration system 30, an outdoor heat exchanger 40, an indoor heat exchanger 50, an outdoor fan 60, an outdoor motor 70, an outdoor coil temperature sensor 80, an outdoor ambient temperature sensor 90, and a controller 100. Among them, the refrigerant circulation circuit 20 circulates the refrigerant in a circuit composed of a compressor, a condenser, an expansion valve, an evaporator, a four-way valve, and a pressure reducer; the refrigeration system 30 performs heat exchange between the refrigerant and indoor air in the compression refrigeration cycle of the refrigerant circulation circuit. The refrigeration system includes a compressor, and the compressor is used to compress the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharge it to the condenser; the outdoor heat exchanger 40 and the indoor heat exchanger 50 are arranged inside the housing. Among them, one works as a condenser and the other works as an evaporator; the outdoor fan 60 is arranged inside the housing and is used to generate an air flow of outdoor air passing through the outdoor heat exchanger to enable heat exchange between the refrigerant and the outdoor air; the outdoor motor 70 is arranged inside the housing and is used to drive the outdoor fan; the outdoor coil temperature sensor 80 is used to detect the outdoor coil temperature; the outdoor ambient temperature sensor 90 is used to detect the outdoor ambient temperature; the controller 100 is configured to: in response to the self-cleaning instruction of the air conditioner, obtain the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, and control at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, so that the preset power module in the air conditioner is within the safe operating temperature range.

[0045] Specifically, the safe operating temperature range can be understood as the temperature range that can ensure the safe operation of the preset power module. That is to say, within this range, the preset power module can operate normally; once it exceeds this range, there is a risk that the preset power module will be broken down or burned out. In the air conditioner according to the embodiment of the present invention, there is no temperature detection device for the preset power module, and a fixed throttling method is adopted. It is impossible to adjust the operating frequency of the compressor or the rotation speed of the outdoor motor 70 by measuring the temperature of the preset power module to make the preset power device in a safe operating temperature range. When the air conditioner performs self-cleaning, if the cleaning method of condensing and then defrosting the outdoor heat exchanger 40 is adopted, since the outdoor motor 70 stops operating and the compressor continues to operate, the temperature of the preset power device rises significantly, easily exceeding the temperature limit value of the preset power device, and it is extremely easy to cause damage to the preset power device. When the outdoor ambient temperature is relatively high, there is no need to adopt the cleaning method of condensing and then defrosting the outdoor heat exchanger to clean the air conditioner. Thus, the risk of damage to the preset power device due to temperature rise can be reduced; at the same time, due to the influence of environmental factors, the actual voltage used by the air conditioner may deviate significantly from the normal value. At the same operating power, the operating current increases, resulting in an increase in the heat generation of the preset power module. Therefore, when the air conditioner receives a self-cleaning instruction, at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner is obtained to control at least one of the rotation direction and the rotation speed of the outdoor motor 70, so as to adopt a variety of air conditioner self-cleaning methods to clean the outdoor heat exchanger 40 of the air conditioner, ensuring that during the self-cleaning process of the air conditioner, the temperature of the preset power module is within the safe operating temperature range, thereby avoiding the problem of burning out or breakdown caused by the too high current temperature of the preset power module, improving the reliability of the operation of the preset power module, and thus realizing the self-cleaning function of the outdoor heat exchanger while ensuring the reliability of the preset power module.

[0046] In a specific embodiment, for the self-cleaning instruction, the user can send the self-cleaning instruction to the air conditioner through the remote control, the air conditioner APP (Application) in the mobile terminal or the operation panel on the body of the air conditioner by means of operations such as language and gesture to trigger the self-cleaning function of the air conditioner. Or, the air conditioner can be set with a periodic self-start self-cleaning instruction to trigger the self-cleaning function of the air conditioner, that is, at regular intervals, the air conditioner will automatically trigger the self-cleaning instruction to execute the self-cleaning function. Thus, without manual operation by the user, the self-cleaning instruction can be periodically and automatically activated to clean the air conditioner, improving the intelligence of the air conditioner.

[0047] In a specific embodiment, an outdoor ambient temperature sensor 90 may be disposed at an appropriate position of the outdoor unit of the air conditioner to collect the outdoor ambient temperature in real time, denoted as Tout for example. The outdoor ambient temperature sensor 90 sends the outdoor ambient temperature Tout collected in real time to the controller of the air conditioner, such as the indoor unit controller, the outdoor unit controller, or an independently provided controller. Alternatively, the outdoor ambient temperature Tout may also be obtained by means of the air conditioner communicating with the cloud. That is to say, the cloud records the outdoor ambient temperature Tout. For example, the outdoor ambient temperature provided by the local weather forecast can be directly obtained by the air conditioner through interactive communication with the cloud.

[0048] In a specific embodiment, the operating voltage and current of the air conditioner can be obtained through a voltage detection circuit or a current detection circuit, and the detected operating voltage or operating current is sent to the controller of the air conditioner, such as the indoor unit controller, the outdoor unit controller, or an independently provided controller.

[0049] In an embodiment of the present invention, as Figure 2 shown, when controlling at least one of the rotation direction and speed of the outdoor motor, the operating frequency and duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and current of the air conditioner, the controller 100 is specifically configured to: determine whether the outdoor ambient temperature does not exceed a first preset temperature or exceeds a second preset temperature; when the outdoor ambient temperature does not exceed the first preset temperature or exceeds the second preset temperature, control the outdoor motor 70 to reverse at a first preset speed for a first preset time; when the outdoor ambient temperature exceeds the first preset temperature but does not exceed the second preset temperature, control at least one of the rotation direction and speed of the outdoor motor 70, the operating frequency and duration of the compressor according to the operating voltage of the air conditioner, wherein the first preset temperature is less than the second preset temperature.

[0050] Specifically, as Figure 2As shown, when the air conditioner performs self-cleaning, it first controls at least one of the rotation direction and speed of the outdoor motor 70, the operating frequency and operating duration of the compressor according to the outdoor ambient temperature. Specifically, when the outdoor ambient temperature is low, that is, when the outdoor ambient temperature does not exceed the first preset temperature, such as Tout1 (the preset value of Tout1 is, for example, 5°C, 2°C or 0°C), the air conditioner usually operates in the heating mode. At this time, there will be frost on the outdoor heat exchanger 40, so there is no need to defrost, that is, there is no need to control the outdoor motor 70 to stop. Control the outdoor motor 70 to reverse at the first preset speed, such as R1, for the first preset time, such as t1, to drive the outdoor fan to operate, so as to defrost and realize the self-cleaning function of the outdoor heat exchanger 40. Since there is no frosting stage and the outdoor fan 60 runs continuously, the preset power device will not heat up and can operate normally. When the outdoor ambient temperature is high, that is, when the outdoor ambient temperature exceeds the second preset temperature, such as Tout2 (the preset value of Tout2 is, for example, 35°C or 40°C), if the outdoor heat exchanger 40 uses the cleaning method of frosting and then defrosting for self-cleaning, due to the high outdoor ambient temperature, the air conditioner is extremely likely to cause the temperature of the preset power device to rise during the frosting stage. Therefore, the cleaning method of frosting and then defrosting is not adopted either. At this time, control the outdoor motor 70 to reverse at the first preset speed R1 for the first preset time t1 to drive the outdoor fan to operate, and the outdoor fan 60 blows away the dust on the outdoor heat exchanger 40 to achieve the self-cleaning function. When the outdoor ambient temperature is moderate, that is, when the outdoor ambient temperature exceeds the first preset temperature Tout1 but does not exceed the second preset temperature Tout2, the outdoor heat exchanger 40 can adopt the cleaning method of frosting and then defrosting for self-cleaning. During the process of self-cleaning in this way, it is necessary to consider the influence of the actual operating voltage of the air conditioner to avoid the actual operating voltage of the air conditioner deviating too much from the normal value and the operating current increasing, resulting in an increase in the heat generation of the preset power module. That is, control at least one of the rotation direction and speed of the outdoor motor 70, the operating frequency and operating duration of the compressor according to the operating voltage of the air conditioner to improve the reliability of the operation of the preset power module and realize the self-cleaning function of the outdoor heat exchanger 40 while ensuring the reliability of the preset power module.

[0051] It should be noted that the first preset temperature Tout1, the second preset temperature Tout2, the first preset speed R1 and the first preset time t1 can be determined by experiments and will not be elaborated here.

[0052] In an embodiment of the present invention, as Figure 3As shown, when controlling at least one of the rotation direction and speed of the outdoor motor 70, the operating frequency and operating duration of the compressor according to the operating voltage of the air conditioner, the controller 100 is specifically configured as follows: when the operating voltage exceeds the first preset voltage and does not exceed the second preset voltage, control the outdoor motor 70 to reverse at the second preset speed for the second preset time; when the outdoor ambient temperature exceeds the first preset temperature and does not exceed the third preset temperature, and the operating voltage exceeds the second preset voltage but does not exceed the third preset voltage, control the compressor to operate at the first preset frequency, and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current first operating current and the current first outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the first preset temperature and does not exceed the third preset temperature, and the operating voltage exceeds the third preset voltage but does not exceed the fourth preset voltage, control the compressor to operate at the second preset frequency, and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current second operating current and the current second outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the third preset temperature and does not exceed the second preset temperature, and the operating voltage exceeds the second preset voltage but does not exceed the third preset voltage, control the compressor to operate at the third preset frequency, and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current third operating current and the current third outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the third preset temperature and does not exceed the second preset temperature, and the operating voltage exceeds the third preset voltage but does not exceed the fourth preset voltage, control the compressor to operate at the fourth preset frequency, and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current fourth operating current and the current fourth outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; wherein, the third preset frequency is less than the fourth preset frequency, the fourth preset frequency is less than the first preset frequency, the first preset frequency is less than the second preset frequency; the third preset temperature is greater than the first preset temperature and less than the second preset temperature; the first preset voltage is less than the second preset voltage, the second preset voltage is less than the third preset voltage, and the third preset voltage is less than the fourth preset voltage.

[0053] Specifically, as Figure 3As shown, when the outdoor ambient temperature exceeds the first preset temperature Tout1 but does not exceed the second preset temperature Tout2, if the operating voltage of the air conditioner is low, that is, when the operating voltage of the air conditioner exceeds the first preset voltage such as V1 (the preset value of V1 is, for example, 150V or 160V) and does not exceed the second preset voltage such as V2 (the preset value of V2 is, for example, 170V or 180V), the operating current flowing through the preset power module is large. Based on the calorific value Q = I 2Rt. The heat generation of the preset power module is relatively large. If the outdoor heat exchanger 40 uses the cleaning method of condensing and then defrosting for self-cleaning, the temperature of the preset power device is extremely likely to increase during the frosting stage of the air conditioner. Therefore, control the outdoor motor 70 to reverse at the second preset speed for the second preset time, such as t2, to drive the outdoor fan 60 to operate, and the outdoor fan 60 blows away the dust collected on the outdoor heat exchanger 40 to achieve the self-cleaning function. Among them, Q is the heat generation of the power module, I is the operating current of the power module, R is the resistance of the power module, and t is the operating time of the power module.When the operating voltage of the air conditioner exceeds the second preset voltage V2 but does not exceed the third preset voltage, such as V3 (the preset value of V3 is, for example, 190V or 200V), or when the operating voltage of the air conditioner exceeds the third preset voltage V3 but does not exceed the fourth preset voltage, such as V4 (the preset value of V4 is, for example, 240V or 250V), due to the different outdoor ambient temperatures, the operating frequency of the compressor is also different, and the operating frequency of the compressor will affect the self-cleaning effect of the frost condensation and defrosting cleaning method. Therefore, when the operating voltage of the air conditioner exceeds the second preset voltage V2 but does not exceed the fourth preset voltage V4, it is necessary to consider the influence of the outdoor ambient temperature on the frost condensation and defrosting cleaning method, that is, a third preset temperature, such as Tout3 (the preset value of Tout3 is, for example, 25°C or 30°C), is introduced between the first preset temperature Tout1 and the second preset temperature Tout2. When the outdoor ambient temperature exceeds the first preset temperature Tout1 and does not exceed the third preset temperature Tout3, and the operating voltage exceeds the second preset voltage V2 but does not exceed the third preset voltage V3, control the compressor to operate at a first preset frequency, such as F1 (the preset value of F1 is, for example, 60Hz or 65Hz), and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current first operating current and the current first outdoor coil temperature; when the outdoor ambient temperature exceeds the first preset temperature Tout1 and does not exceed the third preset temperature Tout3, and the operating voltage exceeds the third preset voltage V3 but does not exceed the fourth preset voltage V4, control the compressor to operate at a second preset frequency, such as F2 (the preset value of F2 is, for example, 65Hz or 68Hz), and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current second operating current and the current second outdoor coil temperature; when the outdoor ambient temperature exceeds the third preset temperature Tout3 and does not exceed the second preset temperature Tout2, and the operating voltage exceeds the second preset voltage V2 but does not exceed the third preset voltage V3, control the compressor to operate at a third preset frequency, such as F3 (the preset value of F3 is, for example, 45Hz or 50Hz), and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current third operating current and the current third outdoor coil temperature; when the outdoor ambient temperature exceeds the third preset temperature Tout3 and does not exceed the second preset temperature Tout2, and the operating voltage exceeds the third preset voltage V3 but does not exceed the fourth preset voltage V4, control the compressor to operate at a fourth preset frequency, such as F4 (the preset value of F4 is, for example, 50Hz or 55Hz), and control the operating frequency and operating duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current fourth operating current and the current fourth outdoor coil temperature, so as to realize a good self-cleaning function of the outdoor heat exchanger 40 while ensuring the reliability of the preset power module.

[0054] It should be noted that the third preset temperature Tout3, the first preset voltage V1, the second preset voltage V2, the third preset voltage V3, the fourth preset voltage V4, the first preset frequency F1, the second preset frequency F2, the third preset frequency F3, and the fourth preset frequency F4 can be determined through experiments and will not be elaborated here.

[0055] Thus, the air conditioner according to the embodiment of the present invention controls at least one of the rotation direction and speed of the outdoor motor 70, the operating frequency and duration of the compressor by detecting the outdoor ambient temperature, the operating voltage, and the operating current of the air conditioner, so as to ensure that the operating temperature of the preset power module does not exceed the standard during the self-cleaning process of the outdoor heat exchanger 40, and improve the reliability of the operation of the preset power module.

[0056] In an embodiment of the present invention, as Figure 4 shown, when controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor 70 according to the current first operating current and the current first outdoor coil temperature, the controller 100 is specifically configured to: when the first operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor 70 according to the first outdoor coil temperature to enable the air conditioner to enter the defrosting mode; when the first operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the fifth preset frequency, and control the rotation direction and speed of the outdoor motor 70 according to the first outdoor coil temperature to enable the air conditioner to enter the defrosting mode; when the first operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the sixth preset frequency, and control the rotation direction and speed of the outdoor motor 70 according to the first outdoor coil temperature to enable the air conditioner to enter the defrosting mode; wherein, the fifth preset frequency is greater than the sixth preset frequency, and the second preset current is greater than the first preset current and less than the third preset current.

[0057] Specifically, as Figure 4As shown, when the outdoor ambient temperature exceeds the first preset temperature Tout1 and does not exceed the third preset temperature Tout3, and the operating voltage exceeds the second preset voltage V2 but does not exceed the third preset voltage V3, the compressor operates at the first preset frequency F1 so that the outdoor heat exchanger 40 performs self-cleaning in the way of frosting and then defrosting. At this time, the rotation direction and speed of the outdoor motor 70 are controlled according to the relationship between the first operating current and the preset current, so that the air conditioner can smoothly perform frosting and defrosting operations. Specifically, when the first operating current does not exceed the first preset current, such as I1 (the preset value of I1 is, for example, 4A or 4.5A), it is judged whether the air conditioner reaches the defrosting condition according to the first outdoor coil temperature. When the defrosting condition is reached, the air conditioner is controlled to enter the defrosting mode to melt the frost into water to wash the outdoor heat exchanger, realizing the self-cleaning of the outdoor heat exchanger 40. When the first operating current exceeds the first preset current I1 but does not exceed the second preset current, such as I2 (the preset value of I2 is, for example, 5.5A or 6A), or when the first operating current exceeds the second preset current I2 but does not exceed the third preset current, such as I3 (the preset value of I3 is, for example, 8A or 10A), the operating current of the air conditioner is relatively large, and the heat generation of the preset power module is relatively large, which is likely to cause the temperature of the preset power device to rise and be damaged. At this time, the frosting and defrosting operations of the air conditioner are further controlled by reducing the operating frequency of the compressor, so as to ensure that the temperature of the preset power module is within the safe operating temperature range while realizing the self-cleaning function of the outdoor heat exchanger 40. Specifically, when the first operating current exceeds the first preset current I1 but does not exceed the second preset current I2, the operating frequency of the compressor is reduced from the first preset frequency F1 to the fifth preset frequency, such as F11 (the preset value of F11 is, for example, 50Hz or 55Hz); when the first operating current exceeds the second preset current I2 but does not exceed the third preset current I3, the operating frequency of the compressor is reduced from the first preset frequency F1 to the sixth preset frequency, such as F12 (the preset value of F12 is, for example, 42Hz or 45Hz).

[0058] It should be noted that the fifth preset frequency F11, the sixth preset frequency F12, the first preset current I1, the second preset current I2 and the third preset current I3 can be determined through experiments and will not be elaborated here.

[0059] In an embodiment of the present invention, as Figure 5As shown, when controlling the rotation direction and speed of the outdoor motor 70 according to the first outdoor coil temperature, the controller 100 is specifically configured to: when the duration for which the first outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor 70 to stop, so that the air conditioner enters the defrosting mode; when the first outdoor coil temperature exceeds the fourth preset temperature, or when the first outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor 70 to continue running for the fourth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0060] Specifically, as Figure 5 shown, when the duration for which the first outdoor coil temperature does not exceed the fourth preset temperature, such as T0 (the preset value of T0 is, for example, -5°C, 10°C or -15°C), reaches the third preset time, such as t3 (the preset value of t3 is, for example, 5 minutes or 6 minutes), it is considered that the frosting effect of the air conditioner is good and defrosting can be carried out to wash the outdoor heat exchanger 40. Therefore, control the outdoor motor 70 to stop, so that the air conditioner enters the defrosting mode; when the first outdoor coil temperature exceeds the fourth preset temperature T0, or when the first outdoor coil temperature does not exceed the fourth preset temperature T0 but the duration does not reach the third preset time, it is considered that the frosting effect of the air conditioner is poor, and the outdoor motor 70 needs to continue running for the fourth preset time, such as t4 (the preset value of t4 is, for example, 10 minutes or 12 minutes), to wait for the outdoor heat exchanger 40 to have a better frosting effect and then enter the defrosting mode for defrosting operation, so as to ensure that the temperature of the preset power module is within the safe operating temperature range while realizing the self-cleaning function of the outdoor heat exchanger 40.

[0061] It should be noted that the fourth preset temperature T0, the third preset time t3, and the fourth preset time t4 can be determined through experiments and will not be elaborated here.

[0062] In an embodiment of the present invention, as Figure 6As shown in the figure, when controlling the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current second operating current and the current second outdoor coil temperature, the controller 100 is specifically configured as follows: when the second operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor 70 according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the second operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the seventh preset frequency, and control the rotation direction and speed of the outdoor motor 70 according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the second operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the eighth preset frequency, and control the rotation direction and speed of the outdoor motor 70 according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the seventh preset frequency is greater than the eighth preset frequency.

[0063] Specifically, as Figure 6 shown in the figure, when the outdoor ambient temperature exceeds the first preset temperature Tout1 and does not exceed the third preset temperature Tout3, and the operating voltage exceeds the third preset voltage V3 but does not exceed the fourth preset voltage V4, the compressor operates at the second preset frequency F2, so that the outdoor heat exchanger 40 performs self-cleaning in the way of frosting and then defrosting. At this time, control the rotation direction and speed of the outdoor motor 70 according to the relationship between the second operating current and the preset current, so that the air conditioner can smoothly perform frosting and defrosting operations. Specifically, when the second operating current does not exceed the first preset current I1, judge whether the air conditioner reaches the defrosting condition according to the second outdoor coil temperature. When the defrosting condition is reached, control the air conditioner to enter the defrosting mode, melt the frost into water, and wash the outdoor heat exchanger 40 to realize the self-cleaning of the outdoor heat exchanger 40. When the second operating current exceeds the first preset current I1 but does not exceed the second preset current I2, or when the second operating current exceeds the second preset current I2 but does not exceed the third preset current I3, the operating current of the air conditioner is relatively large, and the heat generated by the preset power module is relatively large, which is likely to cause the temperature of the preset power device to rise and be damaged. At this time, further control the frosting and defrosting operations of the air conditioner by reducing the operating frequency of the compressor, so as to ensure that the temperature of the preset power module is within the safe operating temperature range while realizing the self-cleaning function of the outdoor heat exchanger. Specifically, when the second operating current exceeds the first preset current I1 but does not exceed the second preset current I2, reduce the operating frequency of the compressor from the second preset frequency F2 to the seventh preset frequency, such as F21 (the preset value of F21 is, for example, 55 Hz or 58 Hz); when the second operating current exceeds the second preset current I2 but does not exceed the third preset current I3, reduce the operating frequency of the compressor from the second preset frequency F2 to the eighth preset frequency, such as F22 (the preset value of F22 is, for example, 45 Hz or 50 Hz).

[0064] It should be noted that the seventh preset frequency F21, the eighth preset frequency F22, the first preset current I1, the second preset current I2, and the third preset current I3 can be determined through experiments and will not be elaborated here.

[0065] In an embodiment of the present invention, as Figure 7 shown, when controlling the rotation direction and speed of the outdoor motor 70 according to the second outdoor coil temperature, the controller 100 is specifically configured as follows: when the duration for which the second outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor 70 to stop, so that the air conditioner enters the defrosting mode; when the second outdoor coil temperature exceeds the fourth preset temperature, or when the second outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor 70 to continue running for a fifth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0066] Specifically, as Figure 7 shown, when the duration for which the second outdoor coil temperature does not exceed the fourth preset temperature T0 reaches the third preset time t3, it is considered that the frosting effect of the air conditioner is good and defrosting can be performed to wash the outdoor heat exchanger 40. Therefore, control the outdoor motor 70 to stop, so that the air conditioner enters the defrosting mode; when the second outdoor coil temperature exceeds the fourth preset temperature T0, or when the second outdoor coil temperature does not exceed the fourth preset temperature T0 but the duration does not reach the third preset time t3, it is considered that the frosting effect of the air conditioner is poor, and the outdoor motor 70 needs to continue running for a fifth preset time, such as t5 (the preset value of t5 is, for example, 6 minutes or 8 minutes), to wait for the outdoor heat exchanger 40 to have a better frosting effect and then enter the defrosting mode for defrosting operation, so as to ensure that the temperature of the preset power module is within the safe operating temperature range while realizing the self-cleaning function of the outdoor heat exchanger 40.

[0067] It should be noted that the fourth preset temperature T0, the third preset time t3, and the fifth preset time t5 can be determined through experiments and will not be elaborated here.

[0068] In an embodiment of the present invention, as Figure 8As shown, when controlling the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current third operating current and the current third outdoor coil temperature, the controller 100 is specifically configured as follows: when the third operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor 70 according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the third operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the ninth preset frequency, and control the rotation direction and speed of the outdoor motor 70 according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the third operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the tenth preset frequency, and control the rotation direction and speed of the outdoor motor 70 according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the ninth preset frequency is greater than the tenth preset frequency.

[0069] Specifically, as Figure 8 shown, when the outdoor ambient temperature exceeds the third preset temperature Tout3 and does not exceed the second preset temperature Tout2, and the operating voltage exceeds the second preset voltage V2 but does not exceed the third preset voltage V3, the compressor operates at the third preset frequency F3, so that the outdoor heat exchanger 40 performs self-cleaning in the way of condensing frost and then defrosting. At this time, control the rotation direction and speed of the outdoor motor 70 according to the relationship between the third operating current and the preset current, so that the air conditioner can smoothly perform the condensing frost and defrosting operations. Specifically, when the third operating current does not exceed the first preset current I1, judge whether the air conditioner reaches the defrosting condition according to the third outdoor coil temperature. When the defrosting condition is reached, control the air conditioner to enter the defrosting mode, melt the frost into water to wash the outdoor heat exchanger 40, and realize the self-cleaning of the outdoor heat exchanger 40. When the third operating current exceeds the first preset current I1 but does not exceed the second preset current I2, or when the third operating current exceeds the second preset current I2 but does not exceed the third preset current I3, the operating current of the air conditioner is relatively large, and the heat generated by the preset power module is relatively large, which is likely to cause the temperature of the preset power device to rise and be damaged. At this time, further control the condensing frost and defrosting operations of the air conditioner by reducing the operating frequency of the compressor, so as to ensure that the temperature of the preset power module is within the safe operating temperature range while realizing the self-cleaning function of the outdoor heat exchanger 40. Specifically, when the third operating current exceeds the first preset current I1 but does not exceed the second preset current I2, reduce the operating frequency of the compressor from the third preset frequency F3 to the ninth preset frequency, such as F31 (the preset value of F31 is, for example, 40 Hz or 42 Hz); when the third operating current exceeds the second preset current I2 but does not exceed the third preset current I3, reduce the operating frequency of the compressor from the third preset frequency F3 to the tenth preset frequency, such as F32 (the preset value of F32 is, for example, 35 Hz or 38 Hz).

[0070] It should be noted that the ninth preset frequency F31, the tenth preset frequency F32, the first preset current I1, the second preset current I2, and the third preset current I3 can be determined through experiments and will not be elaborated here.

[0071] In an embodiment of the present invention, as Figure 9 shown, when controlling the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, the controller 100 is specifically configured to: when the duration that the third outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor 70 to stop, so that the air conditioner enters the defrosting mode; when the third outdoor coil temperature exceeds the fourth preset temperature, or when the third outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor 70 to continue running for the sixth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0072] Specifically, as Figure 9 shown, when the duration that the third outdoor coil temperature does not exceed the fourth preset temperature T0 reaches the third preset time t3, it is considered that the frosting effect of the air conditioner is good and defrosting can be performed to wash the outdoor heat exchanger 40. Therefore, control the outdoor motor 70 to stop, so that the air conditioner enters the defrosting mode; when the third outdoor coil temperature exceeds the fourth preset temperature T0, or when the third outdoor coil temperature does not exceed the fourth preset temperature T0 but the duration does not reach the third preset time t3, it is considered that the frosting effect of the air conditioner is poor, and the outdoor motor 70 needs to continue running for the sixth preset time, such as t6 (the preset value of t6 is, for example, 5 minutes or 6 minutes), to wait for the outdoor heat exchanger 40 to have a better frosting effect and then enter the defrosting mode for defrosting operation, so as to ensure that the temperature of the preset power module is within the safe operating temperature range while realizing the self-cleaning function of the outdoor heat exchanger.

[0073] It should be noted that the fourth preset temperature T0, the third preset time t3, and the sixth preset time t6 can be determined through experiments and will not be elaborated here.

[0074] In an embodiment of the present invention, as Figure 10As shown, when controlling the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor 70 according to the current fourth operating current and the current fourth outdoor coil temperature, the controller 100 is specifically configured as follows: when the fourth operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor 70 according to the fourth outdoor coil temperature to enable the air conditioner to enter the defrosting mode; when the fourth operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the eleventh preset frequency, and control the rotation direction and speed of the outdoor motor 70 according to the fourth outdoor coil temperature to enable the air conditioner to enter the defrosting mode; when the fourth operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the twelfth preset frequency, and control the rotation direction and speed of the outdoor motor 70 according to the fourth outdoor coil temperature to enable the air conditioner to enter the defrosting mode; wherein, the eleventh preset frequency is greater than the twelfth preset frequency.

[0075] Specifically, as Figure 10 shown, when the outdoor ambient temperature exceeds the third preset temperature Tout3 and does not exceed the second preset temperature Tout2, and the operating voltage exceeds the third preset voltage V3 but does not exceed the fourth preset voltage V4, the compressor operates at the fourth preset frequency F4 to enable the outdoor heat exchanger 40 to perform self-cleaning in the manner of condensing frost and then defrosting. At this time, control the rotation direction and speed of the outdoor motor 70 according to the relationship between the fourth operating current and the preset current to enable the air conditioner to smoothly perform the operations of condensing frost and defrosting. Specifically, when the fourth operating current does not exceed the first preset current I1, judge whether the air conditioner reaches the defrosting condition according to the fourth outdoor coil temperature. When the defrosting condition is reached, control the air conditioner to enter the defrosting mode to melt the frost into water to wash the outdoor heat exchanger 40 and realize the self-cleaning of the outdoor heat exchanger 40. When the fourth operating current exceeds the first preset current I1 but does not exceed the second preset current I2, or when the fourth operating current exceeds the second preset current I2 but does not exceed the third preset current I3, the operating current of the air conditioner is relatively large, and the heat generated by the preset power module is relatively large, which is likely to cause the temperature of the preset power device to rise and be damaged. At this time, further control the operations of condensing frost and defrosting of the air conditioner by reducing the operating frequency of the compressor to ensure that the temperature of the preset power module is within the safe operating temperature range while realizing the self-cleaning function of the outdoor heat exchanger 40. Specifically, when the fourth operating current exceeds the first preset current I1 but does not exceed the second preset current I2, reduce the operating frequency of the compressor from the fourth preset frequency F4 to the eleventh preset frequency, for example, F41 (the preset value of F41 is, for example, 42 Hz or 45 Hz); when the fourth operating current exceeds the second preset current I2 but does not exceed the third preset current I3, reduce the operating frequency of the compressor from the fourth preset frequency F4 to the twelfth preset frequency, for example, F42 (the preset value of F42 is, for example, 38 Hz or 40 Hz).

[0076] It should be noted that the eleventh preset frequency F41, the twelfth preset frequency F42, the first preset current I1, the second preset current I2, and the third preset current I3 can be determined through experiments and will not be elaborated here.

[0077] In an embodiment of the present invention, as Figure 11 shown, when controlling the rotation direction and speed of the outdoor motor 70 according to the fourth outdoor coil temperature, the controller 100 is specifically configured to: when the duration that the fourth outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor 70 to stop, so that the air conditioner enters the defrosting mode; when the fourth outdoor coil temperature exceeds the fourth preset temperature, or when the fourth outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor 70 to continue running for the seventh preset time and then stop, so that the air conditioner enters the defrosting mode.

[0078] Specifically, as Figure 11 shown, when the duration that the fourth outdoor coil temperature does not exceed the fourth preset temperature T0 reaches the third preset time t3, it is considered that the frosting effect of the air conditioner is good and defrosting can be carried out to wash the outdoor heat exchanger 40. Therefore, control the outdoor motor 70 to stop, so that the air conditioner enters the defrosting mode; when the fourth outdoor coil temperature exceeds the fourth preset temperature T0, or when the third outdoor coil temperature does not exceed the fourth preset temperature T0 but the duration does not reach the third preset time t3, it is considered that the frosting effect of the air conditioner is poor, and the outdoor motor 70 needs to continue running for the seventh preset time, such as t7 (the preset value of t7 is, for example, 5 minutes or 6 minutes), to wait for the outdoor heat exchanger 40 to have a better frosting effect and then enter the defrosting mode for defrosting operation, so as to ensure that the temperature of the preset power module is within the safe operating temperature range while realizing the self-cleaning function of the outdoor heat exchanger 40.

[0079] It should be noted that the fourth preset temperature T0, the third preset time t3, and the seventh preset time t7 can be determined through experiments and will not be elaborated here.

[0080] According to the air conditioner of the embodiment of the present invention, by responding to the self-cleaning instruction of the air conditioner, obtaining the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, and controlling at least one of the rotation direction and speed of the outdoor motor 70, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, it is possible to avoid the problem that the current temperature of the preset power module is too high and causes burning or breakdown during the self-cleaning of the outdoor heat exchanger without setting a temperature detection device for the preset power module, improve the reliability of the operation of the preset power module, and at the same time achieve a good self-cleaning effect of the outdoor heat exchanger 40.

[0081] A further embodiment of the present invention also discloses a control method for an air conditioner. Figure 12 It is a flowchart of a control method for an air conditioner according to an embodiment of the present invention. As Figure 12 shown, the method includes the following steps:

[0082] Step S1: In response to an instruction to start air conditioner self-cleaning, obtain the outdoor ambient temperature, outdoor coil temperature, operating voltage and operating current of the air conditioner.

[0083] Step S2: Control at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, outdoor coil temperature, operating voltage and operating current of the air conditioner, so that the preset power module in the air conditioner is within the safe operating temperature range.

[0084] In an embodiment of the present invention, when controlling at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, outdoor coil temperature, operating voltage and operating current, and the operating frequency of the compressor, the controller is specifically configured to: determine whether the outdoor ambient temperature does not exceed a first preset temperature or exceeds a second preset temperature; when the outdoor ambient temperature does not exceed the first preset temperature or exceeds the second preset temperature, control the outdoor motor to reverse at a first preset speed for a first preset time; when the outdoor ambient temperature exceeds the first preset temperature but does not exceed the second preset temperature, control at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to the operating voltage of the air conditioner, where the first preset temperature is less than the second preset temperature.

[0085] In an embodiment of the present invention, when controlling at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to the operating voltage of the air conditioner, the controller is specifically configured to: when the operating voltage exceeds the first preset voltage and does not exceed the second preset voltage, control the outdoor motor to reverse at the second preset speed for the second preset time; when the outdoor ambient temperature exceeds the first preset temperature and does not exceed the third preset temperature, and the operating voltage exceeds the second preset voltage but does not exceed the third preset voltage, control the compressor to operate at the first preset frequency, and control the operating frequency and operating duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current first operating current and the current first outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the first preset temperature and does not exceed the third preset temperature, and the operating voltage exceeds the third preset voltage but does not exceed the fourth preset voltage, control the compressor to operate at the second preset frequency, and control the operating frequency and operating duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current second operating current and the current second outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the third preset temperature and does not exceed the second preset temperature, and the operating voltage exceeds the second preset voltage but does not exceed the third preset voltage, control the compressor to operate at the third preset frequency, and control the operating frequency and operating duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current third operating current and the current third outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; when the outdoor ambient temperature exceeds the third preset temperature and does not exceed the second preset temperature, and the operating voltage exceeds the third preset voltage but does not exceed the fourth preset voltage, control the compressor to operate at the fourth preset frequency, and control the operating frequency and operating duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current fourth operating current and the current fourth outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; wherein, the third preset frequency is less than the fourth preset frequency, the fourth preset frequency is less than the first preset frequency, the first preset frequency is less than the second preset frequency; the third preset temperature is greater than the first preset temperature and less than the second preset temperature; the first preset voltage is less than the second preset voltage, the second preset voltage is less than the third preset voltage, and the third preset voltage is less than the fourth preset voltage.

[0086] In an embodiment of the present invention, when controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current first operating current and the current first outdoor coil temperature, the controller is specifically configured as follows: when the first operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the first operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at a fifth preset frequency, and control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the first operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at a sixth preset frequency, and control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the fifth preset frequency is greater than the sixth preset frequency, and the second preset current is greater than the first preset current and less than the third preset current.

[0087] In an embodiment of the present invention, when controlling the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, the controller is specifically configured as follows: when the duration for which the first outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; when the first outdoor coil temperature exceeds the fourth preset temperature, or when the first outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue operating for the fourth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0088] In an embodiment of the present invention, when controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current second operating current and the current second outdoor coil temperature, the controller is specifically configured as follows: when the second operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the second operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at a seventh preset frequency, and control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the second operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at an eighth preset frequency, and control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the seventh preset frequency is greater than the eighth preset frequency.

[0089] In an embodiment of the present invention, when controlling the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, the controller is specifically configured as follows: when the duration that the second outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; when the second outdoor coil temperature exceeds the fourth preset temperature, or when the second outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue running for a fifth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0090] In an embodiment of the present invention, when controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current third operating current and the current third outdoor coil temperature, the controller is specifically configured as follows: when the third operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the third operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at a ninth preset frequency, and control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; when the third operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at a tenth preset frequency, and control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the ninth preset frequency is greater than the tenth preset frequency.

[0091] In an embodiment of the present invention, when controlling the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, the controller is specifically configured as follows: when the duration that the third outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; when the third outdoor coil temperature exceeds the fourth preset temperature, or when the third outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue running for a sixth preset time and then stop, so that the air conditioner enters the defrosting mode.

[0092] In an embodiment of the present invention, when controlling the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor according to the current fourth operating current and the current fourth outdoor coil temperature, the controller is specifically configured as follows: when the fourth operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature to enable the air conditioner to enter the defrosting mode; when the fourth operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the eleventh preset frequency, and control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature to enable the air conditioner to enter the defrosting mode; when the fourth operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the twelfth preset frequency, and control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature to enable the air conditioner to enter the defrosting mode; wherein, the eleventh preset frequency is greater than the twelfth preset frequency.

[0093] In an embodiment of the present invention, when controlling the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, the controller is specifically configured as follows: when the duration for which the fourth outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop operating to enable the air conditioner to enter the defrosting mode; when the fourth outdoor coil temperature exceeds the fourth preset temperature, or when the fourth outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue operating for the seventh preset time and then stop to enable the air conditioner to enter the defrosting mode.

[0094] It should be noted that when the dehumidifier of the embodiment of the present invention performs self-cleaning, its specific implementation manner is similar to the specific implementation manner of the control method of the air conditioner controller of the embodiment of the present invention. For details, please refer to the description in the method section. To reduce redundancy, it will not be elaborated here.

[0095] According to the control method of the air conditioner of the embodiment of the present invention, by responding to the self-cleaning instruction of the air conditioner, obtaining the outdoor environmental temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner, and controlling at least one of the rotation direction and speed of the outdoor motor, the operating frequency and duration of the compressor according to at least one of the outdoor environmental temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner, it is possible to avoid the problem that the current temperature of the preset power module is too high and causes burning or breakdown during the self-cleaning of the outdoor heat exchanger in the case where a temperature detection device of the preset power module is not provided, improve the reliability of the operation of the preset power module, and at the same time achieve a good self-cleaning effect of the outdoor heat exchanger.

[0096] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0097] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that, Comprising: A casing; A refrigerant circulation circuit that circulates refrigerant in a circuit composed of a compressor, a condenser, an expansion valve, an evaporator, a four-way valve, and a pressure reducer; A refrigeration system that performs heat exchange between a refrigerant and indoor air in a compression refrigeration cycle of the refrigerant circulation circuit. The refrigeration system includes the compressor, and the compressor is configured to compress a low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharge it to the condenser; An outdoor heat exchanger and an indoor heat exchanger, which are disposed inside the casing. Among them, one operates as the condenser and the other operates as the evaporator; An outdoor fan, which is disposed inside the casing and is used to generate an air flow of outdoor air passing through the outdoor heat exchanger to enable heat exchange between the refrigerant and the outdoor air; An outdoor motor, which is disposed inside the casing and is used to drive the outdoor fan; An outdoor coil temperature sensor for detecting the outdoor coil temperature; An outdoor ambient temperature sensor for detecting the outdoor ambient temperature; The controller is configured to: in response to a self-cleaning instruction of the air conditioner, obtain the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, and control at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, so that a preset power module in the air conditioner is within a safe operating temperature range; When controlling at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and operating current of the air conditioner, the controller is specifically configured to: Judge whether the outdoor ambient temperature does not exceed a first preset temperature or exceeds a second preset temperature; When the outdoor ambient temperature does not exceed the first preset temperature or exceeds the second preset temperature, control the outdoor motor to reverse at a first preset speed for a first preset time; When the outdoor ambient temperature exceeds the first preset temperature but does not exceed the second preset temperature, control at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to the operating voltage of the air conditioner; wherein, the first preset temperature is less than the second preset temperature.

2. The air conditioner according to claim 1, characterized in that, When controlling at least one of the rotation direction and speed of the outdoor motor, the operating frequency and operating duration of the compressor according to the operating voltage of the air conditioner, the controller is specifically configured to: When the operating voltage exceeds a first preset voltage and does not exceed a second preset voltage, control the outdoor motor to reverse at a second preset speed for a second preset time; When the outdoor ambient temperature exceeds the first preset temperature and does not exceed the third preset temperature, and the operating voltage exceeds the second preset voltage but does not exceed the third preset voltage, control the compressor to operate at the first preset frequency, and control the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor according to the current first operating current and the current first outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; When the outdoor ambient temperature exceeds the first preset temperature and does not exceed the third preset temperature, and the operating voltage exceeds the third preset voltage but does not exceed the fourth preset voltage, control the compressor to operate at the second preset frequency, and control the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor according to the current second operating current and the current second outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; When the outdoor ambient temperature exceeds the third preset temperature and does not exceed the second preset temperature, and the operating voltage exceeds the second preset voltage but does not exceed the third preset voltage, control the compressor to operate at the third preset frequency, and control the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor according to the current third operating current and the current third outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; When the outdoor ambient temperature exceeds the third preset temperature and does not exceed the second preset temperature, and the operating voltage exceeds the third preset voltage but does not exceed the fourth preset voltage, control the compressor to operate at the fourth preset frequency, and control the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor according to the current fourth operating current and the current fourth outdoor coil temperature, so that the preset power module in the air conditioner is within the safe operating temperature range; wherein, the third preset frequency is less than the fourth preset frequency, the fourth preset frequency is less than the first preset frequency, and the first preset frequency is less than the second preset frequency; the third preset temperature is greater than the first preset temperature and less than the second preset temperature; the first preset voltage is less than the second preset voltage, the second preset voltage is less than the third preset voltage, and the third preset voltage is less than the fourth preset voltage.

3. The air conditioner according to claim 2, characterized in that When controlling the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor according to the current first operating current and the current first outdoor coil temperature, the controller is specifically configured to: When the first operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; When the first operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at a fifth preset frequency, and control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; When the first operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at a sixth preset frequency, and control the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the fifth preset frequency is greater than the sixth preset frequency, and the second preset current is greater than the first preset current and less than the third preset current.

4. The air conditioner according to claim 3, characterized in that, When controlling the rotation direction and speed of the outdoor motor according to the first outdoor coil temperature, the controller is specifically configured to: When the duration that the first outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; When the first outdoor coil temperature exceeds the fourth preset temperature, or when the first outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue operating for a fourth preset time and then stop, so that the air conditioner enters the defrosting mode.

5. The air conditioner according to claim 2, wherein, When controlling the operating frequency and duration of the compressor, and the rotation direction and speed of the outdoor motor according to the current second operating current and the current second outdoor coil temperature, the controller is specifically configured to: When the second operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; When the second operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at a seventh preset frequency, and control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; When the second operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at an eighth preset frequency, and control the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the seventh preset frequency is greater than the eighth preset frequency.

6. The air conditioner according to claim 5, wherein, When controlling the rotation direction and speed of the outdoor motor according to the second outdoor coil temperature, the controller is specifically configured to: When the duration that the second outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; When the second outdoor coil temperature exceeds the fourth preset temperature, or when the second outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue operating for a fifth preset time and then stop, so that the air conditioner enters the defrosting mode.

7. The air conditioner according to claim 2, characterized in that, When controlling the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor according to the current third operating current and the current third outdoor coil temperature, the controller is specifically configured as follows: When the third operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; When the third operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the ninth preset frequency, and control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; When the third operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the tenth preset frequency, and control the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the ninth preset frequency is greater than the tenth preset frequency.

8. The air conditioner according to claim 7, characterized in that, When controlling the rotation direction and speed of the outdoor motor according to the third outdoor coil temperature, the controller is specifically configured as follows: When the duration that the third outdoor coil temperature does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; When the third outdoor coil temperature exceeds the fourth preset temperature, or when the third outdoor coil temperature does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue operating for the sixth preset time and then stop, so that the air conditioner enters the defrosting mode.

9. The air conditioner according to claim 2, wherein, When controlling the operating frequency and duration of the compressor, the rotation direction and speed of the outdoor motor according to the current fourth operating current and the current fourth outdoor coil temperature, the controller is specifically configured as follows: When the fourth operating current does not exceed the first preset current, control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, so that the air conditioner enters the defrosting mode; When the fourth operating current exceeds the first preset current but does not exceed the second preset current, control the compressor to operate at the eleventh preset frequency, and control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, so that the air conditioner enters the defrosting mode; When the fourth operating current exceeds the second preset current but does not exceed the third preset current, control the compressor to operate at the twelfth preset frequency, and control the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, so that the air conditioner enters the defrosting mode; wherein, the eleventh preset frequency is greater than the twelfth preset frequency.

10. The air conditioner according to claim 9, characterized in that, When controlling the rotation direction and speed of the outdoor motor according to the fourth outdoor coil temperature, the controller is specifically configured as follows: When the duration that the temperature of the fourth outdoor coil does not exceed the fourth preset temperature reaches the third preset time, control the outdoor motor to stop, so that the air conditioner enters the defrosting mode; When the temperature of the fourth outdoor coil exceeds the fourth preset temperature, or when the temperature of the fourth outdoor coil does not exceed the fourth preset temperature but the duration does not reach the third preset time, control the outdoor motor to continue running for the seventh preset time and then stop, so that the air conditioner enters the defrosting mode.

11. A control method for an air conditioner, characterized in that, For the air conditioner according to any one of claims 1-10, the method includes the following steps: In response to an instruction to turn on the self-cleaning of the air conditioner, obtain the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner; Control at least one of the rotation direction and speed of the outdoor motor and the operating frequency and duration of the compressor according to at least one of the outdoor ambient temperature, the outdoor coil temperature, the operating voltage and the operating current of the air conditioner, so that the preset power module in the air conditioner is within the safe operating temperature range.

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