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

Abstract

The present invention discloses a control method for an air conditioner. The air conditioner includes an outdoor heat exchanger and an outdoor fan. The outdoor fan includes a first fan and a second fan. The first fan is correspondingly arranged with a first heat exchange part of the outdoor heat exchanger; the second fan is correspondingly arranged with a second heat exchange part of the outdoor heat exchanger. The method includes: during the heating process of the air conditioner, obtaining a first outdoor ambient temperature; when the first outdoor ambient temperature is greater than or equal to a first preset ambient temperature, controlling the first fan to be continuously turned on and controlling the second fan to be intermittently turned on, or controlling the first fan and the second fan to be alternately turned on. The present invention also discloses an air conditioner and a computer-readable storage medium. The present invention aims to avoid frequent temperature-reaching and shutdown of the air conditioner while preventing frosting of the outdoor unit, and ensure the continuous and stable operation of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a control method for an air conditioner, an air conditioner, and a computer-readable storage medium. Background Art

[0002] For a split air conditioner with a large cooling capacity, generally two fans are provided in the outdoor unit for heat exchange between different areas of the outdoor heat exchanger and the external environment. Currently, when the indoor heat load is low, especially in a fixed-frequency air conditioner, generally some fans need to be turned off to reduce the heat exchange amount input by the air conditioner into the room to avoid frequent temperature reaching and shutdown of the air conditioner.

[0003] However, when one outdoor fan is turned on and the other outdoor fan is turned off, if the air conditioner operates in heating mode, the outdoor heat exchanger is an evaporator. Turning off some fans will cause a reduction in the heat exchange amount of the outdoor heat exchanger, especially in the heat exchange area corresponding to the turned-off outdoor fan, which easily leads to frosting on the outdoor unit and affects the normal operation of the air conditioner. Summary of the Invention

[0004] The main purpose of the present invention is to provide a control method for an air conditioner, an air conditioner, and a computer-readable storage medium, aiming to avoid frequent temperature reaching and shutdown of the air conditioner while preventing frosting on the outdoor unit and ensuring the continuous and stable operation of the air conditioner.

[0005] To achieve the above object, the present invention provides a control method for an air conditioner. The air conditioner includes an outdoor heat exchanger and outdoor fans. The outdoor fans include a first fan and a second fan, and the first fan is correspondingly arranged with a first heat exchange part of the outdoor heat exchanger; the second fan is correspondingly arranged with a second heat exchange part of the outdoor heat exchanger; the control method for the air conditioner includes the following steps:

[0006] During the heating process of the air conditioner, obtain the first outdoor ambient temperature;

[0007] When the first outdoor ambient temperature is greater than or equal to a first preset ambient temperature, control the first fan to be continuously turned on, and control the second fan to be intermittently turned on, or control the first fan and the second fan to be alternately turned on.

[0008] Optionally, the step of controlling the second fan to be intermittently turned on includes:

[0009] During the continuous operation of the first fan, obtain the state parameter of the outdoor heat exchanger; the state parameter is a parameter representing whether there is a frosting risk on the outdoor heat exchanger currently;

[0010] When the state parameter indicates that there is a frosting risk on the outdoor heat exchanger, control the second fan to be turned on;

[0011] When the state parameter indicates that there is no frosting risk for the outdoor heat exchanger, control the second blower to turn off.

[0012] Optionally, the second blower includes a first wind speed setting and a second wind speed setting, and the first wind speed setting is lower than the second wind speed setting; the step of controlling the second blower to turn on when the state parameter indicates that there is a frosting risk for the outdoor heat exchanger includes:

[0013] When the state parameter indicates that there is a frosting risk for the outdoor heat exchanger, control the second blower to turn on at the first wind speed setting.

[0014] Optionally, after the step of controlling the second blower to turn on when the state parameter indicates that there is a frosting risk for the outdoor heat exchanger, the method further includes:

[0015] While the second blower is in the on state, adjust the opening degree of the electronic expansion valve of the air conditioner so that the target temperature difference corresponding to the indoor heat exchanger is less than or equal to a set temperature difference; the target temperature difference is the temperature difference between a first temperature and a second temperature corresponding to the indoor heat exchanger, the first temperature is detected in the off state before the second blower is turned on, and the second temperature is detected currently.

[0016] Optionally, the step of obtaining the state parameter of the outdoor heat exchanger includes:

[0017] In the off state of the second blower, obtain a current first temperature value of the outdoor heat exchanger and the temperature change trend of the outdoor heat exchanger, and the state parameter includes the first temperature value and the temperature change trend;

[0018] After the step of obtaining the state parameter of the outdoor heat exchanger, the method further includes: when the first temperature value is less than or equal to a first preset temperature and the temperature change trend is a downward trend, determine that the state parameter indicates that there is a frosting risk for the outdoor heat exchanger;

[0019] When the first temperature value is greater than the first preset temperature, or when the temperature change trend is an upward trend, determine that the state parameter indicates that there is no frosting risk for the outdoor heat exchanger.

[0020] Optionally, the second heat exchange part is arranged above the first heat exchange part, the first heat exchange part is provided with a temperature detection module, and the first temperature value and the temperature change trend are determined according to the detection data of the temperature detection module, and the first preset temperature is greater than the set frosting temperature of the second heat exchange part.

[0021] Optionally, the step of obtaining the state parameter of the outdoor heat exchanger includes:

[0022] In the open state of the second fan, obtain the current second temperature value of the outdoor heat exchanger, and the state parameter includes the second temperature value;

[0023] After the step of obtaining the state parameter of the outdoor heat exchanger, the following steps are further included:

[0024] When the second temperature value is less than the second preset temperature and the continuous open duration of the second fan is less than the first preset duration, determine that the state parameter indicates that there is a frosting risk for the outdoor heat exchanger

[0025] When the second temperature value is greater than or equal to the second preset temperature, or when the continuous open duration of the second fan is greater than or equal to the first preset duration, determine that the state parameter indicates that there is no frosting risk for the outdoor heat exchanger.

[0026] Optionally, the step of obtaining the state parameter of the outdoor heat exchanger includes:

[0027] In the closed state of the second fan, obtain the current first suction pressure of the compressor and the pressure change trend on the suction side of the compressor, and the state parameter includes the first suction pressure and the pressure change trend;

[0028] After the step of obtaining the state parameter of the outdoor heat exchanger, the following steps are further included:

[0029] When the first suction pressure is less than or equal to the first preset pressure and the pressure change trend is a downward trend, determine that the state parameter indicates that there is a frosting risk for the outdoor heat exchanger;

[0030] When the first suction pressure is greater than the first preset pressure, or when the pressure change trend is an upward trend, determine that the state parameter indicates that there is no frosting risk for the outdoor heat exchanger.

[0031] Optionally, the step of obtaining the state parameter of the outdoor heat exchanger includes:

[0032] In the open state of the second fan, obtain the current second suction pressure of the compressor, and the state parameter includes the second suction pressure;

[0033] After the step of obtaining the state parameter of the outdoor heat exchanger, the following steps are further included:

[0034] When the second suction pressure is less than the second preset pressure and the continuous open duration of the second fan is less than the second preset duration, determine that the state parameter indicates that there is a frosting risk for the outdoor heat exchanger;

[0035] When the second return air pressure is greater than or equal to the second preset pressure, or when the continuous opening duration of the second blower is greater than or equal to the second preset duration, it is determined that the state parameter indicates that there is no frosting risk for the outdoor heat exchanger.

[0036] Optionally, during the process of controlling the first blower to continuously operate and the second blower to intermittently operate, or controlling the first blower and the second blower to alternately operate, the second outdoor ambient temperature is obtained. When the second outdoor ambient temperature is less than or equal to the second preset ambient temperature, both the first blower and the second blower are controlled to operate; the second preset ambient temperature is less than the first preset ambient temperature.

[0037] In addition, to achieve the above object, the present application further provides an air conditioner, which includes:

[0038] An outdoor heat exchanger, which includes a first heat exchange part and a second heat exchange part;

[0039] An outdoor blower, which includes a first blower and a second blower. The first blower is correspondingly arranged with the first heat exchange part of the outdoor heat exchanger; the second blower is correspondingly arranged with the second heat exchange part of the outdoor heat exchanger;

[0040] A control device. Both the first blower and the second blower are connected to the control device. The control device includes: a memory, a processor, and a control program of the air conditioner stored on the memory and executable on the processor. When the control program of the air conditioner is executed by the processor, the steps of the air conditioner control method described in any one of the above are implemented.

[0041] In addition, to achieve the above object, the present application further provides a computer-readable storage medium, on which a control program of the air conditioner is stored. When the control program of the air conditioner is executed by a processor, the steps of the air conditioner control method described in any one of the above are implemented.

[0042] A control method for an air conditioner proposed by the present invention is based on an air conditioner provided with at least two outdoor fans. Different fans are correspondingly arranged for different heat exchange parts of the outdoor heat exchanger. When the air conditioner starts heating and the detected outdoor ambient temperature is relatively high, it indicates that the indoor heat load is small. At this time, the first fan is continuously turned on while the second fan is intermittently turned on, or both fans are intermittently turned on. Compared with both fans being continuously turned on, the heat transfer amount input by the air conditioner to the indoor can be effectively reduced, and the air conditioner can be effectively prevented from frequently reaching the set temperature and shutting down. On this basis, since any fan will not be turned off for a long time, good heat exchange of the outdoor unit can be ensured, and the cold air dissipated by the outdoor heat exchanger can be timely discharged outdoors by the fan, effectively preventing frosting of the outdoor unit and ensuring the normal operation of the air conditioner. It can be seen that this method can avoid the air conditioner from frequently reaching the set temperature and shutting down while preventing frosting of the outdoor unit, ensuring the continuous and stable operation of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 FIG. is a schematic diagram of the hardware structure involved in the operation of an embodiment of the air conditioner of the present invention;

[0044] Figure 2 FIG. is a schematic flowchart of an embodiment of the control method of the air conditioner of the present invention;

[0045] Figure 3 FIG. is a schematic flowchart of another embodiment of the control method of the air conditioner of the present invention.

[0046] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] The main solution of the embodiment of the present invention is: based on an air conditioner whose outdoor fans include a first fan and a second fan, the first fan is correspondingly arranged for the first heat exchange part of the outdoor heat exchanger; the second fan is correspondingly arranged for the second heat exchange part of the outdoor heat exchanger. During the heating process of the air conditioner, the first outdoor ambient temperature is obtained; when the first outdoor ambient temperature is greater than or equal to the first preset ambient temperature, the first fan is controlled to be continuously turned on, and the second fan is controlled to be intermittently turned on, or, the first fan and the second fan are controlled to be alternately turned on.

[0049] In the prior art, when one outdoor fan is turned on and the other outdoor fan is turned off, if the air conditioner is in heating operation, the outdoor heat exchanger is an evaporator. The reduction of the heat transfer amount of the outdoor heat exchanger will occur when some fans are turned off, especially in the heat exchange area corresponding to the turned-off outdoor fan, which is likely to cause frosting of the outdoor unit and affect the normal operation of the air conditioner.

[0050] The present invention provides the above solution, aiming to avoid frequent temperature - reaching and shutdown of the air conditioner while preventing frosting of the outdoor unit, and ensuring the continuous and stable operation of the air conditioner.

[0051] An embodiment of the present invention provides an air conditioner. Specifically, the air conditioner is a split - type air conditioner, which can be a cabinet - type air conditioner, a wall - mounted air conditioner, a ceiling - mounted air conditioner, etc.

[0052] In this embodiment, referring to Figure 1 , the air conditioner includes an outdoor unit, and the outdoor unit includes an outdoor heat exchanger and an outdoor fan. Specifically, the outdoor fan includes a first fan 11 and a second fan 12.

[0053] The first fan 11 and the second fan 12 are respectively arranged corresponding to different areas of the outdoor heat exchanger. Specifically, the outdoor heat exchanger includes a first heat - exchange part and a second heat - exchange part. The first fan 11 is arranged corresponding to the first heat - exchange part, and the second fan 12 is arranged corresponding to the second heat - exchange part. It should be noted that in other embodiments, more fans can also be set outdoors according to actual needs, and different fans are arranged corresponding to different areas of the outdoor heat exchanger. In this embodiment, both the first fan 11 and the second fan 12 are axial - flow DC fans. Specifically, in this embodiment, the second heat - exchange part is arranged above the first heat - exchange part.

[0054] Furthermore, the outdoor unit may further include a compressor 2 and a throttling device, and the air conditioner may further include an indoor heat exchanger. At least a refrigerant circulation loop of the air conditioner is formed by connecting the compressor 2, the indoor heat exchanger, the throttling device, and the outdoor heat exchanger in sequence end - to - end. When the air conditioner is heating, the refrigerant flowing out of the compressor 2 passes through the indoor heat exchanger, the throttling device, and the outdoor heat exchanger in sequence and then returns to the compressor 2. At this time, the indoor heat exchanger is a condenser and is in a heat - releasing state, and the outdoor heat exchanger is an evaporator and is in a heat - absorbing state.

[0055] In this embodiment, the compressor 2 is a fixed - frequency compressor 2. In other embodiments, the compressor 2 can also be set as a variable - frequency compressor 2 according to actual needs.

[0056] Furthermore, the air conditioner may further include a temperature detection module 3 and / or a pressure detection module 4. Among them, the outdoor heat exchanger may be provided with a temperature detection module 3, and its function is to detect the temperature of the outdoor heat exchanger. In this embodiment, the temperature detection module 3 is arranged on the first heat - exchange part. In other embodiments, the temperature detection module 3 can also be arranged on the second heat - exchange part or on both the first heat - exchange part and the second heat - exchange part at the same time. The temperature detection module 3 can be set to have one or more according to actual needs. When there is one temperature detection module 3, it can be arranged on the coil of the first heat - exchange part. When there are more than one temperature detection module 3, they can be distributed at different positions on the coil of the outdoor heat exchanger. For example, one temperature detection module 3 is provided at the refrigerant inlet of the coil of the outdoor heat exchanger, and one temperature detection module 3 is provided in the middle of the coil.

[0057] In addition, the indoor heat exchanger may further be provided with a temperature detection module 3 for detecting the temperature of the indoor heat exchanger. The temperature detection module 3 may be provided with one or more than one according to actual requirements. When there is one temperature detection module 3, it may be disposed in the middle of the coil of the indoor heat exchanger. When there are more than one temperature detection module 3, they may be distributed at different positions on the coil of the indoor heat exchanger. For example, one temperature detection module 3 is provided at the refrigerant inlet of the coil of the indoor heat exchanger, and one temperature detection module 3 is provided in the middle of the coil.

[0058] Furthermore, a temperature detection module 3 may also be provided outside the housing of the outdoor unit for detecting the outdoor ambient temperature.

[0059] The pressure detection module 4 may be disposed on the discharge side and / or the suction side of the compressor 2 to detect the high-pressure (discharge pressure) and / or low-pressure (suction pressure) of the air-conditioning system.

[0060] Furthermore, with reference to Figure 1 , in addition to the above-mentioned outdoor unit, compressor 2, etc., the air conditioner may further include a control device. The first fan 11 and the second fan 12 in the above-mentioned outdoor fan, the compressor 2, the temperature detection module 3, and the pressure detection module 4 can all be connected to the control device here.

[0061] In the embodiment of the present invention, with reference to Figure 1 , the control device of the air conditioner includes: a processor 1001 (such as a CPU), a memory 1002, a timer 1003, etc. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001. The processor 1001, the memory 1002, and the timer 1003 can be connected through a communication bus.

[0062] Those skilled in the art can understand that Figure 1 the device structure shown in

[0063] does not constitute a limitation on the device, and may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements. Figure 1 As shown in Figure 1 , the memory 1002, as a computer-readable storage medium, may include a control program for the air conditioner. In the device shown in

[0064] An embodiment of the present invention further provides a control method for an air conditioner, which is applied to control the above-mentioned air conditioner.

[0065] Referring to Figure 2 , an embodiment of the control method for the air conditioner of the present application is proposed. In this embodiment, the control method for the air conditioner includes:

[0066] Step S10, during the heating process of the air conditioner, obtain the first outdoor ambient temperature;

[0067] When the air conditioner is in heating operation, the indoor heat exchanger is a condenser and is in a heat release state, and the outdoor heat exchanger is an evaporator and is in a heat absorption state.

[0068] The first outdoor ambient temperature can be obtained by detecting the data obtained by a temperature detection module provided in the outdoor environment (such as a temperature detection module provided outside the outdoor unit housing), or it can be based on networking to obtain the weather information of the area where the air conditioner is located, and the outdoor ambient temperature here is determined according to the obtained weather information.

[0069] During the heating process, the outdoor ambient temperature can be obtained in real time or at intervals of a set duration.

[0070] Step S20, when the first outdoor ambient temperature is greater than or equal to the first preset ambient temperature, control the first blower to be continuously turned on, and control the second blower to be intermittently turned on, or, control the first blower and the second blower to be alternately turned on.

[0071] The first preset ambient temperature is specifically the critical value of the outdoor ambient temperature for distinguishing the high and low indoor heat loads. When the air conditioner is in the heating state, when the first preset ambient temperature is less than or equal to the outdoor ambient temperature, it indicates that the indoor heat load is low; when the first preset ambient temperature is greater than the outdoor ambient temperature, it indicates that the indoor heat load is high.

[0072] The first preset ambient temperature can be a temperature parameter default configured in the system, and the first preset ambient temperature can also be determined based on the set temperature of the air conditioner. The higher the set temperature, the higher the first preset ambient temperature can be. Among them, the set temperature is the target temperature required for the indoor environment and can be a parameter set by the user based on their own needs.

[0073] Among them, the process in which the first fan operates in a continuously - on manner and the second fan operates in an intermittently - on manner specifically means that while the first fan continuously rotates, the second fan is periodically turned on in a way that it is turned off for a period of time and then turned on for a period of time. The switching between the on and off states of the second fan can be achieved through a preset fixed cycle. For example, the second fan can be alternately cycled on in the way of "the second fan is turned off for a first preset duration and the second fan is turned on for a second preset duration". The first preset duration and the second preset duration can be the same or different according to actual requirements. In addition, during the continuous operation of the first fan, parameters related to the frosting of the outdoor unit can be monitored, and based on the detected parameters, it is judged whether there is a frosting risk for the outdoor unit, and the second fan is controlled to be turned on or off based on the judgment result.

[0074] The alternate operation of the first fan and the second fan specifically means: defining the state of turning on the first fan and turning off the second fan as the first state, and defining the state of turning off the first fan and turning on the second fan as the second state. After operating in the first state for a certain duration, it can be switched to the second state for operation, and after operating in the second state for a certain duration, it can be switched to the first state for operation. Specifically, the switching between the first state and the second state can be achieved through a preset fixed cycle. For example, it can be alternately cycled in the way of "operating in the first state for a third preset duration and operating in the second state for a fourth preset duration". The third preset duration and the fourth preset duration can be the same or different according to actual requirements. In addition, during the process in which the outdoor fan operates in the first state or the second state, parameters related to the frosting of the outdoor unit can be monitored, and based on the detected parameters, it is judged whether there is a frosting risk for the outdoor unit. When there is a frosting risk, it is switched to the other state for operation, and when there is no frosting risk, it maintains the current state for operation.

[0075] A control method for an air conditioner proposed in an embodiment of the present invention is based on an air conditioner equipped with at least two outdoor fans. When the air conditioner operates in heating mode and the detected outdoor ambient temperature is relatively high, it indicates that the indoor heat load is relatively small. At this time, the first fan is continuously turned on while the second fan is intermittently turned on, or both fans are intermittently turned on. Compared with the situation where both fans are continuously turned on, the heat transfer amount input into the room by the air conditioner can be effectively reduced, and the air conditioner can be effectively prevented from frequently reaching the set temperature and shutting down. On this basis, since any fan will not be turned off for a long time, good heat exchange of the outdoor unit can be ensured, and the cold generated by the outdoor heat exchanger can be timely discharged outdoors by the fan, effectively preventing the outdoor unit from frosting and ensuring the normal operation of the air conditioner. It can be seen that this method can avoid the air conditioner from frequently reaching the set temperature and shutting down while preventing the outdoor unit from frosting, ensuring the continuous and stable operation of the air conditioner.

[0076] Furthermore, in this embodiment, when the first outdoor ambient temperature is lower than the first preset ambient temperature, the first fan and the second fan can be controlled to be turned on simultaneously to ensure that the heat transfer amount output by the air conditioner can meet the thermal comfort requirements of indoor users.

[0077] Further, in this embodiment, during the execution of step S20, the second outdoor ambient temperature is obtained. When the second outdoor ambient temperature is less than or equal to the second preset ambient temperature, both the first fan and the second fan are controlled to be turned on; when the second outdoor ambient temperature is greater than the second preset ambient temperature, step S20 can be continuously executed. The second preset ambient temperature is less than the first preset ambient temperature. The second preset ambient temperature can be specifically determined according to the first preset ambient temperature and can be a temperature with a preset deviation from the first preset ambient temperature. During the execution of step S20, the second outdoor ambient temperature can be obtained in real time or at preset time intervals. Here, when the second outdoor ambient temperature is less than or equal to the second preset ambient temperature, it indicates that the heat load of the current indoor environment is relatively high. At this time, the state of only partially turning on the outdoor fan cannot ensure the heat exchange amount required for indoor thermal comfort. Based on this, both the first fan and the second fan are turned on, which can ensure that the air conditioner inputs a sufficiently large heat exchange amount into the indoor environment to meet the thermal comfort requirements of users in the indoor environment.

[0078] Further, based on the above embodiment, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, referring to Figure 3 , the step of controlling the second fan to be intermittently turned on in step S20 includes:

[0079] Step S21, during the continuous operation of the first fan, the state parameter of the outdoor heat exchanger is obtained; the state parameter is a parameter characterizing whether there is a frosting risk in the current outdoor heat exchanger;

[0080] The acquisition of the state parameter here can be obtained by analyzing the parameters related to outdoor unit frosting (such as outdoor heat exchanger temperature, compressor suction pressure, compressor suction temperature, indoor ambient temperature, and / or indoor coil temperature, etc.) after detection, or can be obtained by obtaining an instruction input by the user.

[0081] The state parameter can be one of the first state parameter and the second state parameter. The first state parameter is that there is a frosting risk in the outdoor heat exchanger, and the second state parameter is that there is no frosting risk in the outdoor heat exchanger.

[0082] Step S22, determine whether the state parameter is that there is a frosting risk in the outdoor heat exchanger;

[0083] When the state parameter is that there is a frosting risk in the outdoor heat exchanger, step S23 is executed; when the state parameter is that there is no frosting risk in the outdoor heat exchanger, step S24 is executed.

[0084] Step S23, control the second fan to be turned on;

[0085] Step S24, control the second fan to be turned off.

[0086] Specifically, when it is first detected that the first outdoor ambient temperature is greater than or equal to the first preset ambient temperature, the first fan can be controlled to run continuously while the second fan is controlled to turn off. When the second fan is in the off state, steps S21 and S22 here can be executed. If the judgment result is that there is a risk of frosting on the outdoor heat exchanger, the second fan can be turned on. If the judgment result is that there is no risk of frosting on the outdoor heat exchanger, the second fan can be controlled to maintain the off state. Among them, when the second fan is in the on state, steps S21 and S22 here can be executed. If the judgment result is that there is a risk of frosting on the outdoor heat exchanger, the second fan can be controlled to maintain the on state. If the judgment result is that there is no risk of frosting on the outdoor heat exchanger, the second fan can be turned off. Steps S21 and S22 here are executed again in the off state, and the second fan is controlled based on the judgment result, and so on.

[0087] Among them, after the second fan is turned on, it can run at a fixed speed or a variable speed. The speed at which the second fan runs can be preset or determined according to the actual operating conditions of the air conditioner. Specifically, the speed of the second fan can be determined according to the current speed of the first fan. The greater the speed of the first fan, the smaller the speed of the second fan, so as to ensure that the heat input into the room by the air conditioner is small and avoid frequent temperature reaching and shutdown in the room. The speed of the second fan can also be determined according to the temperature difference between the coil temperature of the outdoor heat exchanger and the frosting temperature. The greater the temperature difference, the greater the speed of the second fan can be.

[0088] In this embodiment, the second fan includes a first gear and a second gear, and the first gear is less than the second gear. When the state parameter is that there is a risk of frosting on the outdoor heat exchanger, the step of controlling the second fan to turn on includes: when the state parameter is that there is a risk of frosting on the outdoor heat exchanger, controlling the second fan to turn on at the first gear. The maximum critical value of the first gear can be 50% of the maximum speed value allowed for the second fan to run. In this embodiment, the first gear specifically includes a first sub-gear and a second sub-gear, and the first sub-gear is less than the second sub-gear. The second fan can run at the second sub-gear. In this embodiment, the second fan can run at a fixed speed or a variable speed between 300 rpm and 600 rpm. Here, after the second fan is turned on, it runs at a lower speed, which can strengthen the heat exchange of the outdoor heat exchanger while avoiding excessive heat exchange input into the room by the air conditioner and frequent temperature reaching and shutdown.

[0089] Further, during the intermittent startup of the second blower, the first blower can operate at a fixed speed or at different speeds. Specifically, to avoid frequent temperature reaching and shutdown in the room when the indoor heat load is small, when the second blower is turned on, the first blower can be controlled to reduce its speed; when the second blower is turned off, the first blower can be controlled to operate at the speed before the reduction. Among them, the change in the speed of the second blower before and after startup can be less than or equal to the amplitude of the speed reduction of the first blower.

[0090] In this embodiment, during the continuous operation of the first blower, based on the monitoring results of the state parameters of the outdoor heat exchanger, the second blower is controlled to switch between the on state and the off state, so as to ensure that the second blower can be turned on in time when there is a risk of frosting to strengthen the heat dissipation of the outdoor heat exchanger, and when there is no risk of frosting, the second blower can be turned off in time to reduce the heat input into the room by the air conditioner to avoid frequent temperature reaching and shutdown in the room, achieving the best balance effect of avoiding frequent temperature reaching and shutdown of the air conditioner while preventing frosting of the outdoor unit.

[0091] Further, in this embodiment, after controlling the second blower to turn on, it further includes:

[0092] Step S30, in the on state of the second blower, adjust the opening degree of the electronic expansion valve of the air conditioner so that the target temperature difference corresponding to the indoor heat exchanger is less than or equal to the set temperature difference; the target temperature difference is the temperature difference between the first temperature and the second temperature corresponding to the indoor heat exchanger, the first temperature is detected in the off state before the second blower is turned on, and the second temperature is detected currently.

[0093] Specifically, when the second blower is in the off state, if the opening condition of the second blower is met (for example, the shutdown duration reaches the preset duration, or the above state parameter is that there is a risk of frosting on the outdoor heat exchanger), at this time, the data detected in real time by the temperature sensor set on the indoor heat exchanger coil can be obtained first as the first temperature here, and then the second blower is controlled to turn on. After the second blower is turned on, the data detected in real time by the temperature sensor set on the indoor heat exchanger coil can be obtained in real time as the second temperature here, and the absolute value of the difference between the first temperature and the second temperature is used as the target temperature difference here.

[0094] Specifically, the opening degree of the electronic expansion valve can be adjusted based on the magnitude relationship between the target temperature difference and the set temperature difference.

[0095] When the target temperature difference is less than the set temperature difference, the electronic expansion valve can be controlled to maintain the current opening or increase the opening. Among them, when the opening of the electronic expansion valve increases, it is beneficial to further avoid the frosting risk of the outdoor heat exchanger. When the target temperature difference is less than the set temperature difference, the deviation between the target temperature difference and the set temperature difference can be determined. When the deviation is greater than the preset threshold, the electronic expansion valve can be controlled to increase the opening. When the deviation is less than or equal to the preset threshold, the electronic expansion valve can be controlled to maintain the current opening operation.

[0096] When the target temperature difference is greater than the set temperature difference, the electronic expansion valve can be controlled to reduce the opening.

[0097] Among them, when it is necessary to increase or decrease the opening of the electronic expansion valve, the opening of the electronic expansion valve can be adjusted according to the pre-set fixed opening adjustment parameters, or the opening adjustment parameters can be determined based on the actual capacity output of the air conditioner to adjust the opening of the electronic expansion valve. The opening adjustment parameters here include the opening adjustment amplitude and / or the opening adjustment rate. Specifically, in this embodiment, the deviation between the target temperature difference and the set temperature difference can be determined, and the opening adjustment parameters can be determined based on the deviation. For example, when the opening adjustment parameter is the opening adjustment amplitude, the larger the deviation, the larger the opening adjustment amplitude, and the smaller the deviation, the smaller the opening adjustment amplitude; when the opening adjustment parameter is the opening adjustment rate, the larger the deviation, the larger the opening adjustment rate, and the smaller the deviation, the smaller the opening adjustment rate.

[0098] Here, after the second fan is turned on, the change in the temperature of the indoor heat exchanger is restricted by adjusting the opening of the electronic expansion valve, ensuring that the temperature of the indoor heat exchanger can be stabilized within a certain range before and after the second fan is turned on, so as to ensure that the heat exchange amount input by the air conditioner to the indoor environment is almost unchanged before and after the second fan is turned on, effectively avoiding the air conditioner from reaching the set temperature and shutting down due to indoor temperature fluctuations, thereby ensuring the continuous and stable operation of the air conditioner while the outdoor heat exchanger does not frost.

[0099] Furthermore, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, the specific process of obtaining the state parameters of the outdoor heat exchanger in step S21 is as follows:

[0100] Step S211, in the closed state of the second fan, obtain the current first temperature value of the outdoor heat exchanger and the temperature change trend of the outdoor heat exchanger, and the state parameters include the first temperature value and the temperature change trend;

[0101] When the second blower is turned off, the temperature of the outdoor heat exchanger can be detected at intervals of a set duration. Specifically, the temperature of the outdoor heat exchanger can be obtained from the data detected in real time by the temperature detection module provided on the outdoor heat exchanger coil. The set duration here can be set according to actual needs. In this embodiment, the set duration is 10 minutes. In other embodiments, the set duration can also be set to a longer or shorter duration according to actual needs, such as 5 minutes, 8 minutes, 13 minutes, 20 minutes, etc. Specifically, the outdoor ambient temperature can be obtained, and based on the outdoor ambient temperature, the set duration here can be obtained. The lower the outdoor ambient temperature, the shorter the obtained set duration can be, and the higher the outdoor ambient temperature, the longer the obtained set duration can be.

[0102] Specifically, among the detection data of the outdoor heat exchanger, the outdoor heat exchanger temperatures adjacent to each other at any two detection times are defined as the third temperature and the fourth temperature. The detection time of the third temperature is earlier than that of the fourth temperature. Specifically, the fourth temperature can refer to the currently detected outdoor heat exchanger temperature at any time. Therefore, the fourth temperature can be the current first temperature value of the outdoor heat exchanger here. Comparing the magnitude relationship between the third temperature and the fourth temperature or determining the quantitative relationship between the third temperature and the fourth temperature can determine the change trend of the outdoor heat exchanger temperature. Specifically, when the third temperature is greater than the fourth temperature, it can be determined that the temperature change trend is a downward trend. When the third temperature is less than the fourth temperature, it can be determined that the temperature change trend is an upward trend. Or, determine the difference between the third temperature and the fourth temperature, such as the result obtained by the third temperature - the fourth temperature. When the difference is less than 0, it can be considered that the temperature change trend is an upward trend. When the difference is greater than 0, it can be considered that the temperature change trend is a downward trend.

[0103] After step S211, it further includes:

[0104] Step S212, determining whether the first temperature value is less than or equal to a first preset temperature and determining whether the temperature change trend is a downward trend;

[0105] When the first temperature value is less than or equal to the first preset temperature and the temperature change trend is a downward trend, step S213 is executed; when the first temperature value is greater than the first preset temperature, or when the temperature change trend is an upward trend, step S214 is executed.

[0106] Step S213, determining that the state parameter is that there is a risk of frosting on the outdoor heat exchanger;

[0107] Step S214, determining that the state parameter is that there is no risk of frosting on the outdoor heat exchanger.

[0108] The first preset temperature here is specifically a parameter greater than or equal to the freezing point temperature, and the specific value can be set according to the actual situation. Specifically, the first preset temperature here can be obtained according to the rated cooling capacity of the air conditioner. In this embodiment, the first preset temperature is 5°C. In other embodiments, the first preset temperature can also be set to a larger or smaller first preset temperature according to actual needs, such as 3°C, 6°C, etc.

[0109] In this embodiment, by combining the current temperature of the outdoor heat exchanger and the trend of temperature change, it can accurately reflect whether the outdoor heat exchanger currently has a frosting trend to reflect the frosting risk of the outdoor heat exchanger, and achieve precise control of the intermittent start of the second fan. This is beneficial to ensuring that the second fan can be started in advance and in a timely manner when the outdoor heat exchanger is not frosted but has a trend, so as to optimize the heat exchange of the outdoor heat exchanger, thereby effectively reducing the frosting risk of the outdoor heat exchanger and ensuring the reliability of the system operation. And when the outdoor heat exchanger does not have a frosting trend, the second fan is timely turned off to ensure that the amount of air input into the indoor heat exchanger by the air conditioner is low enough to delay the temperature-reaching shutdown.

[0110] Among them, in order to further improve the accuracy of frosting trend characterization and the precision of the on-off switching of the second fan, and thus further improve the comprehensive effect of avoiding frequent temperature-reaching shutdowns of the air conditioner while preventing frosting of the outdoor unit. In this embodiment, when determining the deviation between the above-mentioned third temperature and the fourth temperature, the deviation here is the absolute value of the difference between the third temperature and the fourth temperature. Based on this, when the first temperature value (i.e., the fourth temperature) is less than or equal to the first preset temperature and the temperature change trend is a downward trend, if the deviation is greater than or equal to the preset deviation, step S213 is executed; when the first temperature value is less than or equal to the first preset temperature and the temperature change trend is a downward trend, if the deviation is less than the preset deviation, step S214 is executed. Among them, the preset deviation here can be obtained according to the rated cooling capacity of the air conditioner.

[0111] Further, in this embodiment, the second heat exchange part is arranged above the first heat exchange part. The first heat exchange part is provided with a temperature detection module, and the first temperature value and the temperature change trend are determined according to the detection data of the temperature detection module. The first preset temperature is greater than the set frosting temperature of the second heat exchange part. The set frosting temperature is specifically the temperature when the second heat exchange part frosts, such as 0 degrees.

[0112] In this embodiment, a temperature detection module is provided in the first heat exchange part corresponding to the first fan, while no temperature detection module is provided in the second heat exchange part corresponding to the second fan. Based on this, the above-mentioned first temperature value and temperature change trend can be the current temperature of the second heat exchange part and the temperature change trend of the second heat exchange part. Based on this, a temperature conversion relationship between the temperature of the first heat exchange part and the temperature of the second heat exchange part can be established in advance. The temperature of the first heat exchange part is obtained in real time or at intervals of a set duration. Based on the pre-set temperature conversion relationship, the temperature of the second heat exchange part at different times can be converted, and the current temperature and temperature change trend of the second heat exchange part can be determined based on the temperature of the second heat exchange part at different times. Specifically, the temperature change trend of the first heat exchange part is the same as that of the second heat exchange part. Since the first fan is continuously turned on to heat the first heat exchange part, the temperature of the first heat exchange part is higher than that of the second heat exchange part. For example, if the current temperature of the first heat exchange part is T1, then the current temperature of the second heat exchange part is T1 - m, the temperature change trend of the first heat exchange part is a downward trend, and the temperature change trend of the second heat exchange part is also a downward trend.

[0113] In this embodiment, the frosting risk of the outdoor heat exchanger, especially the second heat exchange part, is analyzed by the temperature of the first heat exchange part corresponding to the first fan, so as to ensure that the on-off state of the second fan is switched in time even when no sensor is provided in the second heat exchange part of the outdoor heat exchanger, effectively balancing the prevention of frosting and frequent temperature reaching and shutdown.

[0114] It should be noted that, in addition to steps S211 to S214, when the second fan is in the off state, the frosting trend of the outdoor heat exchanger can also be determined by other temperature parameters. For example, the frosting risk of the outdoor heat exchanger can be determined solely by the comparison result of the current temperature of the outdoor heat exchanger and the first preset temperature.

[0115] Furthermore, in this embodiment, step S21 may further include:

[0116] Step S215, when the second fan is in the on state, obtain the current second temperature value of the outdoor heat exchanger, and the state parameter includes the second temperature value;

[0117] The second temperature value can specifically be obtained by obtaining in real time the detection parameters of the sensors arranged on the outdoor heat exchanger coil. Specifically, a temperature detection module is provided in the first heat exchange part corresponding to the first fan, while no temperature detection module is provided in the second heat exchange part corresponding to the second fan. Based on this, the second temperature value here can be the current temperature of the second heat exchange part. By obtaining the current temperature of the first heat exchange part and based on the pre-established temperature conversion relationship between the temperature of the first heat exchange part and the temperature of the second heat exchange part, the current temperature of the second heat exchange part can be converted. In this way, it is ensured that even when no sensor is provided in the second heat exchange part of the outdoor heat exchanger, the on-off state of the second fan can be switched in time, effectively taking into account both avoiding frosting and avoiding frequent temperature-reaching shutdowns.

[0118] After step S215, it further includes:

[0119] Step S216, determining whether the second temperature value is less than the second preset temperature and determining whether the continuous on-time of the second fan is less than the first preset time;

[0120] When the second temperature value is less than the second preset temperature and the continuous on-time of the second fan is less than the first preset time, S217 is executed after that; when the second temperature value is greater than or equal to the second preset temperature, or when the continuous on-time of the second fan is greater than or equal to the first preset time, step S218 is executed.

[0121] The first preset time can specifically be set according to the actual situation. For example, the first preset time can be obtained according to the outdoor ambient temperature to ensure that the on-off switching of the second fan can effectively take into account both avoiding frosting and avoiding frequent temperature-reaching shutdowns.

[0122] The second preset temperature is greater than or equal to the above-mentioned first preset temperature, and the specific value of the second preset temperature can be set according to actual requirements.

[0123] Step S217, determining that the state parameter is that there is a frosting risk for the outdoor heat exchanger

[0124] Step S218, determining that the state parameter is that there is no frosting risk for the outdoor heat exchanger.

[0125] In this embodiment, during the process of the fan being turned on, by combining the comparison result between the temperature of the outdoor heat exchanger and the second preset temperature and the operation duration of the second fan, it is possible to accurately identify whether the frosting risk of the outdoor heat exchanger is reduced after the second fan starts. Thus, it is ensured that the second fan can be maintained on when there is still a frosting risk for the outdoor heat exchanger, and the second fan can be turned off in time when the outdoor heat exchanger has no frosting risk, effectively taking into account both preventing frosting and avoiding frequent temperature-reaching shutdowns.

[0126] It should be noted that in other embodiments, in addition to steps S215 to S218, when the second fan is in the on state, it is also possible to determine whether there is a frosting trend on the outdoor heat exchanger through other temperature parameters. For example, by combining the comparison result of the current temperature of the outdoor heat exchanger with the first preset temperature and the temperature change trend, or by identifying whether there is a frosting risk on the outdoor heat exchanger solely through the temperature change trend, etc.

[0127] Furthermore, based on any of the above embodiments, another embodiment of the control method of the air conditioner of the present application is proposed. In this embodiment, step S21 includes:

[0128] Step S201, when the second fan is in the off state, obtain the current first suction pressure of the compressor and the pressure change trend on the suction side of the compressor. The state parameters include the first suction pressure and the pressure change trend;

[0129] When the second fan is off, the suction pressure of the compressor can be detected at intervals of a set time. The suction pressure of the compressor can specifically be obtained from the data detected in real time by the pressure detection module provided on the coil of the outdoor heat exchanger. The set time here can be set according to actual needs. In this embodiment, the set time is 10 minutes. In other embodiments, the set time can also be set to a longer or shorter time according to actual needs, such as 5 minutes, 8 minutes, 13 minutes, 20 minutes, etc. Specifically, the outdoor ambient temperature can be obtained, and the set time here can be obtained based on the outdoor ambient temperature. The lower the outdoor ambient temperature, the shorter the obtained set time can be, and the higher the outdoor ambient temperature, the longer the obtained set time can be.

[0130] Specifically, in the detection data of the outdoor heat exchanger, the suction pressures of the compressor adjacent to any two detection times are defined as the first pressure and the second pressure. The detection time of the first pressure is earlier than that of the second pressure. The second pressure can specifically refer to the current first suction pressure of the compressor detected at any time. Therefore, the second pressure can be the current first suction pressure of the outdoor heat exchanger here. Comparing the magnitude relationship between the first pressure and the second pressure or determining the quantitative relationship between the first pressure and the second pressure can determine the change trend of the suction pressure of the compressor. Specifically, when the first pressure is greater than the second pressure, it can be determined that the pressure change trend is a downward trend. When the first pressure is less than the second pressure, it can be determined that the pressure change trend is an upward trend. Or, determine the difference between the first pressure and the second pressure, such as the result obtained by the first pressure - the second pressure. When the difference is less than 0, it can be considered that the pressure change trend is an upward trend. When the difference is greater than 0, it can be considered that the pressure change trend is a downward trend.

[0131] After step S201, it further includes:

[0132] Step S202: Determine whether the first return air pressure is less than or equal to the first preset pressure and whether the pressure change trend is a downward trend;

[0133] When the first return air pressure is less than or equal to the first preset pressure and the pressure change trend is a downward trend, execute step S203; when the first return air pressure is greater than the first preset pressure, or when the pressure change trend is an upward trend, execute step S204.

[0134] Step S203: Determine that the state parameter indicates a risk of frosting on the outdoor heat exchanger;

[0135] Step S204: Determine that the state parameter indicates no risk of frosting on the outdoor heat exchanger.

[0136] The specific value of the first preset pressure here can be set according to the actual situation. For example, the first preset pressure here can be determined according to the pressure on the suction side of the compressor when the outdoor heat exchanger is at the freezing point temperature. Specifically, the first preset pressure here can be obtained according to the rated cooling capacity of the air conditioner. In this embodiment, the first preset pressure is 0.6 MPa. In other embodiments, the first preset pressure can also be set to a larger or smaller value according to actual needs, such as 0.4 MPa, 0.7 MPa, etc.

[0137] In this embodiment, by combining the current return air pressure on the suction side of the compressor and the trend of pressure change, it can accurately reflect whether the outdoor heat exchanger currently has a frosting trend to reflect the frosting risk of the outdoor heat exchanger, realize precise control of the intermittent start of the second fan, and is beneficial to ensuring that the second fan can be started in advance and in a timely manner when the outdoor heat exchanger is not frosted but has a trend to optimize the heat exchange of the outdoor heat exchanger, thereby effectively reducing the frosting risk of the outdoor heat exchanger and ensuring the reliability of system operation. And when the outdoor heat exchanger does not have a frosting trend, the second fan is timely turned off to ensure that the amount of air input into the indoor heat exchanger by the air conditioner is low enough to delay reaching the temperature and shutting down.

[0138] Among them, in order to further improve the accuracy of frosting trend characterization and the accuracy of the on / off switching of the second fan, thereby further improving the comprehensive effect of avoiding frequent temperature reaching and shutdown of the air conditioner while preventing frosting of the outdoor unit. In this embodiment, when determining the pressure deviation between the first pressure and the second pressure, where the pressure deviation is the absolute value of the difference between the first pressure and the second pressure. Based on this, when the first suction pressure (i.e., the second pressure) is less than or equal to the first preset air pressure and the air pressure change trend is a downward trend, if the pressure deviation is greater than or equal to the preset pressure deviation, step S203 is executed; when the first suction pressure (i.e., the second pressure) is less than or equal to the first preset air pressure and the air pressure change trend is a downward trend, if the pressure deviation is less than the preset pressure deviation, step S204 is executed. Among them, the preset pressure deviation here can be obtained according to the rated cooling capacity of the air conditioner.

[0139] It should be noted that in addition to steps S201 to S204, when the second fan is in the closed state, the frosting trend of the outdoor heat exchanger can also be determined by other pressure parameters, such as the discharge pressure of the compressor.

[0140] Furthermore, in this embodiment, step S21 may further include:

[0141] Step S205, when the second fan is in the on state, obtain the current second suction pressure of the compressor, and the state parameter includes the second suction pressure;

[0142] The second suction pressure can specifically be obtained by the parameter detected by the pressure sensor set on the suction side of the compressor in real time. The detection process can be analogously referred to the above-mentioned first pressure and second pressure, and will not be elaborated here.

[0143] Step S206, determine whether the second suction pressure is less than the second preset pressure, and determine whether the continuous on duration of the second fan is less than the second preset duration;

[0144] When the second suction pressure is less than the second preset pressure and the continuous on duration of the second fan is less than the second preset duration, step S207 is executed; when the second suction pressure is greater than or equal to the second preset pressure, or when the continuous on duration of the second fan is greater than or equal to the second preset duration, step S208 is executed.

[0145] Step S207, determine that the state parameter is that the outdoor heat exchanger has a frosting risk;

[0146] Step S208, determine that the state parameter is that the outdoor heat exchanger has no frosting risk.

[0147] The specific value of the second preset duration can be set according to the actual situation. For example, the second preset duration can be obtained according to the outdoor ambient temperature to ensure that the opening and closing switching of the second fan can effectively balance the prevention of frosting and the avoidance of frequent temperature reaching and shutdown.

[0148] The second preset pressure is greater than or equal to the above-mentioned first preset pressure, and the specific value of the second preset pressure can be set according to actual requirements.

[0149] In this embodiment, during the process of the fan being turned on, by combining the comparison result of the pressure of the outdoor heat exchanger with the second preset pressure and the running duration of the second fan, it is possible to accurately identify whether the frosting risk of the outdoor heat exchanger is reduced after the second fan starts. Thus, it is ensured that the second fan can be maintained in the on state when there is still a risk of frosting on the outdoor heat exchanger, and the second fan can be timely turned off when there is no frosting risk on the outdoor heat exchanger, achieving an effective balance between preventing frosting and avoiding frequent temperature reaching and shutdown.

[0150] It should be noted that in other embodiments, in addition to steps S205 to S208, when the second fan is in the on state, it is also possible to determine whether there is a frosting trend on the outdoor heat exchanger through other pressure parameters. For example, by combining the comparison of the pressure on the exhaust side of the compressor with the pressure threshold corresponding to frosting of the outdoor unit, etc., to identify whether there is a frosting risk on the outdoor heat exchanger.

[0151] Based on any of the above embodiments, the state parameters of the outdoor heat exchanger can also be judged according to the coil of the indoor heat exchanger. For example, the temperature change trend of the indoor heat exchanger can be obtained. If the temperature change trend is a temperature drop, it can be determined that there is a frosting risk on the outdoor heat exchanger; if the temperature change trend is a temperature rise, it can be determined that there is no frosting risk on the outdoor heat exchanger.

[0152] In addition, an embodiment of the present invention also proposes a computer-readable storage medium, on which a control program of an air conditioner is stored. When the control program of the air conditioner is executed by a processor, it implements the relevant steps of any of the above embodiments of the control method of the air conditioner.

[0153] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or system including that element.

[0154] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0155] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described method of the embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases, the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes several instructions for causing a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0156] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes an outdoor heat exchanger and an outdoor fan. The outdoor fan includes a first fan and a second fan, and the first fan is correspondingly arranged with a first heat exchange part of the outdoor heat exchanger; The second fan is correspondingly arranged with a second heat exchange part of the outdoor heat exchanger; The control method of the air conditioner includes the following steps: During the heating process of the air conditioner, obtain the first outdoor ambient temperature; When the first outdoor ambient temperature is greater than or equal to the first preset ambient temperature, control the first fan to be continuously turned on and control the second fan to be intermittently turned on; The step of controlling the second fan to be intermittently turned on includes: During the continuous operation of the first fan, obtain the state parameters of the outdoor heat exchanger; The state parameter is a parameter characterizing whether there is a frosting risk in the outdoor heat exchanger currently; When the state parameter indicates that there is a frosting risk in the outdoor heat exchanger, control the second fan to be turned on; In the on state of the second fan, adjust the opening degree of the electronic expansion valve of the air conditioner so that the target temperature difference corresponding to the indoor heat exchanger is less than or equal to the set temperature difference; The target temperature difference is the temperature difference between the first temperature and the second temperature corresponding to the indoor heat exchanger. The first temperature is detected in the off state before the second fan is turned on, and the second temperature is detected currently.

2. The control method of the air conditioner according to claim 1, characterized in that After the step of obtaining the state parameters of the outdoor heat exchanger during the continuous operation of the first fan, it further includes: When the state parameter indicates that there is no frosting risk in the outdoor heat exchanger, control the second fan to be turned off.

3. The control method of the air conditioner according to claim 1, characterized in that, The second fan includes a first gear and a second gear, and the first gear is less than the second gear; The step of controlling the second fan to be turned on when the state parameter indicates that there is a frosting risk in the outdoor heat exchanger includes: When the state parameter indicates that there is a frosting risk in the outdoor heat exchanger, control the second fan to be turned on at the first gear.

4. The control method of the air conditioner according to claim 1, characterized in that, The step of obtaining the state parameters of the outdoor heat exchanger includes: In the off state of the second fan, obtain the current first temperature value of the outdoor heat exchanger and the temperature change trend of the outdoor heat exchanger. The state parameter includes the first temperature value and the temperature change trend; After the step of obtaining the state parameters of the outdoor heat exchanger, it further includes: when the first temperature value is less than or equal to the first preset temperature and the temperature change trend is a downward trend, determine that the state parameter is that there is a frosting risk in the outdoor heat exchanger; When the first temperature value is greater than the first preset temperature, or when the temperature change trend is an upward trend, determine that the state parameter is that there is no frosting risk in the outdoor heat exchanger.

5. The control method of the air conditioner according to claim 4, characterized in that, The second heat exchange part is arranged above the first heat exchange part. The first heat exchange part is provided with a temperature detection module. The first temperature value and the temperature change trend are determined according to the detection data of the temperature detection module. The first preset temperature is greater than the set frosting temperature of the second heat exchange part.

6. The control method of the air conditioner according to claim 1, characterized in that, The step of obtaining the state parameters of the outdoor heat exchanger includes: In the on state of the second blower, obtain the current second temperature value of the outdoor heat exchanger, and the state parameter includes the second temperature value; After the step of obtaining the state parameter of the outdoor heat exchanger, the following steps are further included: When the second temperature value is less than the second preset temperature and the continuous on duration of the second blower is less than the first preset duration, determine that the state parameter indicates that the outdoor heat exchanger has a frosting risk; When the second temperature value is greater than or equal to the second preset temperature, or when the continuous on duration of the second blower is greater than or equal to the first preset duration, determine that the state parameter indicates that the outdoor heat exchanger has no frosting risk.

7. The control method of the air conditioner according to claim 1, characterized in that, The step of obtaining the state parameter of the outdoor heat exchanger includes: In the off state of the second blower, obtain the current first suction pressure of the compressor and the pressure change trend of the suction side of the compressor, and the state parameter includes the first suction pressure and the pressure change trend; After the step of obtaining the state parameter of the outdoor heat exchanger, the following steps are further included: When the first suction pressure is less than or equal to the first preset pressure and the pressure change trend is a downward trend, determine that the state parameter indicates that the outdoor heat exchanger has a frosting risk; When the first suction pressure is greater than the first preset pressure, or when the pressure change trend is an upward trend, determine that the state parameter indicates that the outdoor heat exchanger has no frosting risk.

8. The control method of the air conditioner according to claim 1, wherein The step of obtaining the state parameter of the outdoor heat exchanger includes: In the on state of the second blower, obtain the current second suction pressure of the compressor, and the state parameter includes the second suction pressure; After the step of obtaining the state parameter of the outdoor heat exchanger, the following steps are further included: When the second suction pressure is less than the second preset pressure and the continuous on duration of the second blower is less than the second preset duration, determine that the state parameter indicates that the outdoor heat exchanger has a frosting risk; When the second suction pressure is greater than or equal to the second preset pressure, or when the continuous on duration of the second blower is greater than or equal to the second preset duration, determine that the state parameter indicates that the outdoor heat exchanger has no frosting risk.

9. The control method of the air conditioner according to any one of claims 1 to 8, characterized in that, During the process of controlling the first blower to be continuously on and controlling the second blower to be intermittently on, obtain the second outdoor ambient temperature. When the second outdoor ambient temperature is less than or equal to the second preset ambient temperature, control both the first blower and the second blower to be on; the second preset ambient temperature is less than the first preset ambient temperature.

10. An air conditioner, characterized in that, The air conditioner includes: An outdoor heat exchanger, which includes a first heat exchange part and a second heat exchange part; An outdoor blower, which includes a first blower and a second blower. The first blower is correspondingly arranged with the first heat exchange part; the second blower is correspondingly arranged with the second heat exchange part; A control device, the first blower and the second blower are both connected to the control device, the control device includes: a memory, a processor, and a control program of an air conditioner stored on the memory and executable on the processor, and when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner according to any one of claims 1 to 9 are implemented.

11. A computer-readable storage medium, characterized in that, A control program of an air conditioner is stored on the computer-readable storage medium, and when the control program of the air conditioner is executed by a processor, the steps of the control method of the air conditioner according to any one of claims 1 to 9 are implemented.

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