Control method and control device of air-conditioning outdoor unit and air-conditioning system

Abstract

The present invention discloses a control method, device, air conditioning system and computer storage medium for an air-conditioning outdoor unit, wherein the control method comprises: in response to a first instruction, obtaining a first pressure value on the suction side of the compressor and a second pressure value on the exhaust side of the compressor at intervals of a first time period; determining and controlling the operation mode of the fan according to at least one of the obtained first pressure value and the second pressure value and a preset pressure threshold. When controlling the fan, the embodiment of the present invention comprehensively considers the high pressure on the exhaust side of the compressor and the low pressure on the suction side of the compressor to control the operation mode of the fan, and can adapt to the cooling mode and heating mode of the air-conditioning system respectively, making the operation of the air-conditioning outdoor unit more reliable; especially when the air-conditioning system is in heating mode, the control method can also effectively reduce low-pressure fluctuations or excessively low low pressure caused by adjustment of the fan operation mode, avoid frequent defrosting of the air-conditioning system, and effectively improve the energy efficiency of the air-conditioning system.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method, a control device, an air conditioning system and a computer storage medium for an air conditioning outdoor unit. Background Art

[0002] As living standards improve, people's demands for a more comfortable working environment are also increasing. Consequently, multi-split air conditioning systems are widely used in many small and medium-sized buildings and public buildings. For multi-split air conditioning systems, effectively controlling the fan operation of the air conditioner's outdoor unit is a key issue. Related technologies exist that utilize compressor pressure to control the fan, but these publicly available control methods fail to meet the diverse usage scenarios of air conditioning systems, resulting in high overall energy consumption and unreliable operation. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, the present invention provides a control method, a control device, an air conditioning system, and a computer storage medium for an air conditioner outdoor unit, which can meet various usage scenarios of the air conditioning system, effectively reduce energy consumption, and make the air conditioning system more reliable.

[0004] On the one hand, an embodiment of the present invention provides a control method for an air-conditioning outdoor unit, wherein the air-conditioning outdoor unit includes a fan and a compressor, and the control method includes: in response to a first instruction, obtaining a first pressure value on the exhaust side of the compressor and a second pressure value on the suction side of the compressor every first time period, wherein the first instruction is used to determine the operating mode of the fan; determining and controlling the operating mode of the fan based on at least one of the first pressure value and the second pressure value and a preset pressure threshold.

[0005] In some embodiments, the pressure threshold includes a first threshold, and the operation mode of the fan is determined based on at least one of the first pressure value and the second pressure value and a preset pressure threshold, including: when the first pressure value is greater than or equal to the first threshold, determining and controlling the operation mode of the fan to be the first mode or the second mode; when the first pressure value is less than the first threshold, determining and controlling the operation mode of the fan to be the third mode or the fourth mode; wherein, the first mode is for the fan to be turned off, the second mode is for the fan to reduce the current wind speed, the third mode is for the fan to maintain the current wind speed, and the fourth mode is for the fan to increase the current wind speed.

[0006] In some embodiments, the pressure threshold also includes a second threshold, the second threshold is greater than the first threshold, and when the first pressure value is greater than or equal to the first threshold, the operation mode of the fan is determined and controlled to be the first mode or the second mode, including: when the first pressure value is greater than or equal to the second threshold, the operation mode of the fan is determined and controlled to be the first mode; when the first pressure value is less than the second threshold, the operation mode of the fan is the second mode.

[0007] In some embodiments, the pressure threshold also includes a third threshold and a fourth threshold, the fourth threshold is less than the third threshold, and when the first pressure value is less than the first threshold, determining and controlling the operation mode of the fan to be the third mode or the fourth mode includes: when the second pressure value is greater than or equal to the third threshold, determining and controlling the operation mode of the fan to be the first mode or the second mode; when the second pressure value is less than the third threshold and greater than or equal to the fourth threshold, determining and controlling the operation mode of the fan to be the third mode; when the second pressure value is less than the fourth threshold, determining and controlling the operation mode of the fan to be the fourth mode.

[0008] In some embodiments, when the second pressure value is greater than or equal to the third threshold, determining and controlling the operating mode of the fan to be the first mode or the second mode includes: when the second pressure value is greater than or equal to the third threshold, determining and controlling the operating mode of the fan to be the second mode; when after a second period of time, the second pressure value continues to be greater than or equal to the third threshold, determining and controlling the operating mode of the fan to be adjusted to the first mode.

[0009] In some embodiments, the control method also includes: when the operating mode of the fan is the second mode, obtaining the first pressure value and the second pressure value again after the first time period; if the first pressure value is less than the first threshold value, the second pressure value is less than the third threshold value and greater than or equal to the fourth threshold value, determining and controlling the operating mode of the fan to be adjusted to the third mode.

[0010] In some embodiments, the control method also includes: when the operating mode of the fan is the fourth mode, obtaining the first pressure value and the second pressure value again after the first time period; if the first pressure value is less than the first threshold value, the second pressure value is less than the third threshold value and greater than or equal to the fourth threshold value, determining and controlling the operating mode of the fan to be adjusted to the third mode.

[0011] In some embodiments, the pressure threshold includes a third threshold and a fourth threshold, the fourth threshold is less than the third threshold, and the operation mode of the fan is determined based on at least one of the first pressure value and the second pressure value and a preset pressure threshold, including: when the second pressure value is greater than or equal to the third threshold, determining and controlling the operation mode of the fan to be the first mode or the second mode; when the second pressure value is less than the third threshold and the second pressure value is greater than or equal to the fourth threshold, determining and controlling the operation mode of the fan to be the third mode; when the second pressure value is less than the fourth threshold, determining and controlling the operation mode of the fan to be the fourth mode; wherein, the first mode is to shut down the fan, the second mode is to reduce the current wind speed of the fan, the third mode is to maintain the current wind speed of the fan, and the fourth mode is to increase the current wind speed of the fan.

[0012] In some embodiments, when the second pressure value is greater than or equal to the third threshold, determining and controlling the operating mode of the fan to be the first mode or the second mode includes: when the second pressure value is greater than or equal to the third threshold, determining and controlling the operating mode of the fan to be the second mode; when after a third period of time, the second pressure value continues to be greater than or equal to the third threshold, determining and controlling the operating mode of the fan to be adjusted to the first mode.

[0013] In some embodiments, the control method further includes: obtaining the ambient temperature of the location of the fan in response to a second instruction, the second instruction being used to indicate that the operating mode of the air-conditioning system is the heating mode; determining the initial wind speed of the fan based on the ambient temperature; and triggering the first instruction when the fan continues to run at the initial wind speed for a period greater than or equal to a fourth period.

[0014] On the other hand, an embodiment of the present invention provides a control device for an air-conditioning outdoor unit, wherein the air-conditioning outdoor unit includes a fan and a compressor, and the control device includes: a signal receiving module for obtaining a first pressure value on the exhaust side of the compressor and a second pressure value on the suction side of the compressor every first time period in response to a first instruction; and a control module for determining and controlling the operating mode of the fan based on at least one of the first pressure value and the second pressure value and a preset pressure threshold.

[0015] On the other hand, an embodiment of the present invention provides a control device, comprising: at least one processor; at least one memory for storing at least one program; when the at least one program is executed by the at least one processor, the at least one processor implements the control method of the air-conditioning outdoor unit as described above.

[0016] On the other hand, an embodiment of the present invention provides an air-conditioning system, which includes the control device as described above.

[0017] On the other hand, an embodiment of the present invention provides a computer storage medium storing a program executable by a processor. When the program is executed by the processor, it is used to implement the control method of the air conditioner outdoor unit as described above.

[0018] The beneficial effects of the control method for the air-conditioning outdoor unit of the embodiment of the present invention are as follows: when controlling the air-conditioning outdoor unit using the control method of the embodiment of the present invention, the high pressure on the exhaust side of the compressor and the low pressure on the suction side of the compressor are comprehensively considered to control the operation mode of the fan, which can adapt to the cooling mode and heating mode of the air-conditioning system respectively, making the operation of the air-conditioning outdoor unit more reliable; especially when the air-conditioning system is in heating mode, the control method of the embodiment of the present invention can also effectively reduce the low-pressure fluctuation or excessive low pressure caused by the adjustment of the fan operation mode, avoid the frequent defrosting of the air-conditioning system, and effectively improve the energy efficiency of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention, but do not constitute a limitation to the technical solution of the present invention.

[0020] Figure 1 A schematic diagram of a control device for an air-conditioning outdoor unit provided by some embodiments of the present invention;

[0021] Figure 2 A flowchart of a method for controlling an outdoor unit of an air conditioner according to some embodiments of the present invention;

[0022] Figure 3 A flow chart of steps for a control module to control a fan according to a first pressure value provided in some embodiments of the present invention;

[0023] Figure 4 A flow chart of steps for controlling a fan according to a first pressure value and a second pressure value provided by a control module in some embodiments of the present invention;

[0024] Figure 5 A flow chart of steps for a control module to control a fan according to a second pressure value provided in some embodiments of the present invention;

[0025] Figure 6 A flowchart of the steps for starting a fan provided in an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of a control device for an air-conditioning outdoor unit provided in some embodiments of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0028] It should be noted that although the system diagrams illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the system or the sequence in the flowcharts. The terms "first," "second," "third," "fourth," and so on, in the specification, claims, and drawings, are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.

[0029] With the improvement of living standards, people's requirements for the comfort of the working environment are also increasing. Therefore, multi-split air-conditioning systems are widely used in many small and medium-sized buildings and public buildings. For multi-split air-conditioning systems, how to effectively control the operation of the fan of the air-conditioning outdoor unit is an important issue. There is a solution in the related art that uses the compressor pressure to control the fan, but this solution generally does not take into account the current operating mode of the air-conditioning system. Regardless of whether the air-conditioning system is in heating mode or cooling mode, the fan is controlled according to the high pressure on the exhaust side of the compressor. However, in cold winter, when the air conditioner is in heating mode, if the fan is improperly controlled, it may cause low pressure on the suction side of the compressor, causing frequent frost on the outdoor unit, affecting the energy efficiency and heating effect of the air-conditioning system.

[0030] Based on this, the present invention provides a control method, device, air conditioner and computer storage medium for a fan. When controlling the fan, the control method proposed in the present invention comprehensively considers the high pressure on the exhaust side of the compressor and the low pressure on the suction side of the compressor to control the operation mode of the fan, which can adapt to the cooling mode and heating mode of the air-conditioning system respectively, making the operation of the fan more reliable; especially when the air-conditioning system is in heating mode in winter, the embodiment of the present invention can also effectively reduce the low-pressure fluctuation or excessive low pressure caused by the adjustment of the fan operation mode, thereby avoiding the frequent defrosting of the air-conditioning system, and giving users a good user experience while effectively saving energy consumption.

[0031] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0032] refer to Figure 1 , Figure 1 This is a schematic diagram of a control device for an air-conditioning outdoor unit provided in some embodiments of the present invention. It can be understood that the air-conditioning outdoor unit includes a fan (i.e., an outdoor fan) and a compressor, and the control device 100 includes but is not limited to a signal receiving module 110 and a control module 120.

[0033] Specifically, in response to the first instruction, the signal receiving module 110 obtains a first pressure value on the exhaust side of the compressor and a second pressure value on the suction side of the compressor every first time period; the control module is used to determine and control the operating mode of the fan based on at least one of the first pressure value and the second pressure value and a preset pressure threshold.

[0034] It should also be noted that the control device for an outdoor air conditioner unit proposed in the embodiments of the present invention is applicable to a "one-to-many" multi-split air conditioning system, that is, an air conditioning system in which a single outdoor air conditioner is coupled with multiple indoor air conditioners. In other embodiments, the embodiments of the present invention may also be applicable to ordinary household air conditioners with outdoor air conditioners. For the sake of a unified description, the embodiments of the present invention primarily describe the use of the control method and control device proposed in the embodiments of the present invention in a multi-split air conditioning system.

[0035] refer to Figure 2 , Figure 2 The present invention provides a flow chart of the steps of the control method of the air conditioner outdoor unit according to some embodiments of the present invention. The method can be applied to Figure 1 The control device of the fan shown in FIG. 1 includes but is not limited to steps S200-S210:

[0036] Step S200: In response to a first instruction, obtaining a first pressure value on the exhaust side of the compressor and a second pressure value on the suction side of the compressor every first time period;

[0037] Specifically, the first command is used to control the operating mode of the fan. The first command can be triggered automatically by the control module or by the user. The user can send the first command to the air conditioner via infrared using a remote control, or using a mobile terminal such as a mobile phone via Wi-Fi, Bluetooth, or other connection methods. The user can also directly control the air conditioner system to enter heating mode through the air conditioner control panel.

[0038] In response to the first instruction, the signal receiving module obtains the second pressure value on the suction side of the compressor and the first pressure value on the exhaust side of the compressor every first time period, that is, the signal receiving module periodically obtains the first pressure value and the second pressure value.

[0039] Generally speaking, when the air conditioner is operating normally, the compressor inhales low-temperature, low-pressure gas from the intake pipe and discharges high-temperature, high-pressure gas from the exhaust pipe. Therefore, the air pressure on the intake pipe side of the compressor is lower, and the air pressure on the exhaust pipe side is higher.

[0040] Therefore, by installing a high-pressure pressure sensor at the exhaust pipe port of the compressor or other location where the exhaust pressure can be detected, the first pressure value on the exhaust side of the compressor can be obtained. The first pressure value is relatively high, generally above 2MPa.

[0041] Similarly, by installing a low-pressure pressure sensor at the suction pipe of the compressor or other location where the suction pressure can be detected, a second pressure value on the suction side of the compressor can be obtained. Compared with the first pressure value, the second pressure value is relatively low, generally below 1 MPa.

[0042] At the same time, after receiving the first instruction, the signal receiving module collects the second pressure value and the first pressure value every first time period t1.

[0043] It can be understood that the first pressure value in the embodiment of the present invention can be collected by one sensor or multiple sensors. For example, multiple high-pressure pressure sensors are used to collect multiple first pressure values, and the multiple first pressure values ​​are subjected to a certain weighted average processing, and then the first pressure value used for subsequent fan control is determined; similarly, the second pressure value can also be determined as described above.

[0044] Step S210: determining and controlling an operating mode of the fan according to at least one of the first pressure value and the second pressure value and a preset pressure threshold;

[0045] Specifically, the control module compares the acquired first pressure value and the second pressure value with a preset pressure threshold value to determine whether the first pressure value and the second pressure value are within a normal pressure value range, thereby controlling the operation mode of the fan.

[0046] It is understandable that, since the first pressure value is relatively high and the second pressure value is relatively low, the first pressure value and the second pressure value should be compared with different pressure thresholds respectively to determine whether the first pressure value and the second pressure value are normal.

[0047] It should be noted that the control method of the air-conditioning outdoor unit according to the embodiment of the present invention controls the operation mode of the fan according to at least one of the first pressure value and the second pressure value.

[0048] That is to say, the fan can be controlled according to the first pressure value and the preset pressure threshold, or according to the second pressure value and the preset pressure threshold, or according to the first pressure value, the second pressure value and the preset pressure threshold.

[0049] In the actual use of air-conditioning systems, people generally turn on the heating mode of the air-conditioning system in winter. Then the heat exchanger in the outdoor unit of the air-conditioning needs to evaporate and absorb heat, and the temperature of the outdoor unit of the air-conditioning is lower than the cold air outside. If the heat exchange between the heat exchanger and the outside air is not timely enough, the heat exchanger of the outdoor unit of the air-conditioning will come into contact with moisture in the air and frost will form.

[0050] In the air-conditioning system, the high pressure on the exhaust side of the compressor and the low pressure on the intake side will affect each other. It can be understood that the high pressure and the low pressure have the same change trend. When the high pressure is relatively low, the low pressure will also be relatively low.

[0051] In addition, when the wind speed of the fan changes, the low pressure on the suction side of the compressor may fluctuate, and the low pressure may be lower.

[0052] In the related art, regardless of whether the air-conditioning system is in heating mode or cooling mode, only the high pressure value is considered to control the fan, that is, only the first pressure value in the embodiment of the present invention is considered for control. When the high pressure is too high, reducing the fan speed can reduce the exhaust pressure. When the low pressure is too low, but the fan still maintains the current wind speed or even reduces the wind speed, the fan cannot effectively allow the heat exchanger in the air-conditioning outdoor unit to exchange heat with the outdoor air, thereby accelerating the frost formation of the air-conditioning outdoor unit, affecting the heat exchange efficiency of the heat exchanger, and causing the heating efficiency of the air-conditioning system to decrease.

[0053] Furthermore, to improve the heat exchange efficiency of the heat exchanger in the air conditioner's outdoor unit, the air conditioning system needs to enter defrost mode to defrost the outdoor unit, which is a waste of system energy efficiency. In addition, in related technologies, some air conditioner outdoor units cannot continue to blow hot air into the room when in defrost mode, and heating cannot resume until the defrost is completed. This causes frequent fluctuations in indoor temperature, resulting in a poor user experience.

[0054] Through steps S200-S210, an embodiment of the present invention provides a control method for an air-conditioning outdoor unit, in which a signal receiving module responds to a first instruction, obtains a first pressure value and a second pressure value at first time intervals, and determines an operating mode of the fan based on at least one of the first pressure value and the second pressure value and a pressure threshold, and controls the fan to operate according to the selected operating model.

[0055] Therefore, the control method proposed in the present invention comprehensively considers the high pressure on the exhaust side of the compressor and the low pressure on the suction side of the compressor to control the operating mode of the fan, which can adapt to the cooling mode and heating mode of the air-conditioning system respectively, making the operation of the fan more reliable; in addition, when the air-conditioning system is in heating mode in winter, the embodiment of the present invention can also effectively reduce the low-pressure fluctuation or excessive low pressure caused by the adjustment of the fan operating mode, thereby causing the air-conditioning system to defrost frequently, without affecting the energy efficiency of the system, giving users a good user experience.

[0056] In some embodiments, the above step S210 includes a step of controlling the fan with a first pressure value. Figure 3 , Figure 3A flowchart of steps for a control module to control the operation of a fan according to a first pressure value provided in some embodiments of the present invention, the method including but not limited to steps S300-S310;

[0057] Step S300: When the first pressure value is greater than or equal to the first threshold, determining and controlling the operation mode of the fan to be the first mode or the second mode;

[0058] Specifically, there are four operating modes of the fan in the embodiment of the present invention, namely the first mode, the second mode, the third mode and the fourth mode. Among them, the first mode is to shut down the fan, the second mode is to reduce the current wind speed of the fan, the third mode is to maintain the current wind speed of the fan, and the fourth mode is to increase the current wind speed of the fan.

[0059] In step S300, the first pressure value obtained in step S100 is compared with a preset first threshold value, which indicates whether the air conditioning system is currently experiencing excessively high pressure. When the first pressure value is greater than or equal to the first threshold value, indicating that the current compressor exhaust pressure is excessively high, the fan operation mode is determined and controlled to the first mode or the second mode, that is, the fan is turned off or its current wind speed is reduced.

[0060] Step S310: When the first pressure value is less than the first threshold, determining and controlling the operation mode of the fan to be the third mode or the fourth mode;

[0061] Specifically, the first pressure value obtained in step S100 is compared with a preset first threshold value. When the first pressure value is less than the first threshold value, it indicates that the exhaust pressure of the current compressor is in a normal state or the exhaust pressure is too low. The operation mode of the fan is determined and controlled to be the third mode or the fourth mode, that is, the fan is maintained to operate at the current wind speed, or the current wind speed of the fan is increased.

[0062] It can be understood that in some embodiments, only the first pressure value on the exhaust side of the compressor can be used to control the fan, as shown in steps S300-S310. When the first pressure value indicates that the high pressure is too high, the fan can randomly enter the first mode or the second mode. Whether shutting down the fan or reducing the wind speed of the fan can effectively solve the problem of excessive high pressure.

[0063] In other embodiments, the compressor status can also be measured in combination with other parameters of the air conditioning system, such as the operating time of the heating mode, the temperature of the compressor, etc., which will not be described in detail here. Steps S300-S310 of the embodiment of the present invention are intended to illustrate that the operating mode of the fan can be controlled by a larger first pressure value.

[0064] It should be noted that the embodiment of the present invention is to control the fan by utilizing the high pressure on the exhaust side of the compressor and the low pressure on the intake side, and specifically compares the first pressure value and the second pressure value with the preset pressure thresholds (that is, the first threshold and the second threshold, the third threshold and the fourth threshold below) to obtain the selection result of the fan operation mode.

[0065] It should be noted that the embodiments of the present invention do not conflict with the high-pressure protection mechanism and low-pressure protection mechanism of the air-conditioning system itself. For example, when the collected first pressure value is higher than the high-pressure threshold of the air-conditioning system itself, the air-conditioning system can give priority to executing the corresponding protection measures.

[0066] It is understood that the fan speed change in embodiments of the present invention can take various forms. As mentioned in step S100, the signal receiving module re-receives the current first and second pressure values ​​of the compressor every first period of time before performing subsequent control. In some embodiments, the fan can continue to uniformly reduce or increase the wind speed during the current first period of time until the end of the current period. The fan then determines whether to continue reducing or increasing the wind speed, or maintain the current wind speed, based on the new operating mode.

[0067] In other embodiments, the speed of the fan can be measured in gears, and the lowest operating gear and the highest operating gear are set. When the operating mode of the fan is the second mode or the fourth mode, that is, the current wind speed needs to be reduced or increased, then within the first time period, the fan completes the wind speed adjustment of at least one gear. For example, the current wind speed of the fan is gear 3. In the fourth mode, the wind speed increases from gear 3 to gear 4. When the next pressure value sampling time arrives, the fan just reaches gear 4 or has been running at gear 4 for a period of time.

[0068] It can also be understood that the specific value of the first duration can refer to the windshield conversion capability of the current air-conditioning outdoor unit. For example, if the air-conditioning outdoor unit can adjust the fan speed at a speed of 20 seconds per gear, then the value of the first duration can be 40 seconds, 50 seconds, and so on.

[0069] After the wind speed is changed, the fan can run at the lowered or raised wind speed for a period of time. In this way, the pressure value collected at the next sampling moment can better reflect the regulating effect of wind speed on compressor pressure, and can also reduce the large fluctuations in high and low pressure caused by frequent changes in fan speed.

[0070] In summary, the embodiments of the present invention do not impose any specific restrictions on the wind speed change form of the wind turbine.

[0071] Through steps S300 - S310 , the embodiment of the present invention provides a solution for controlling the operation mode of the fan based on the first pressure value on the exhaust side of the compressor.

[0072] In some embodiments, the above step S210 further includes a step of controlling the fan together with the first pressure value and the second pressure value. Figure 4 , Figure 4 A flow chart of steps of controlling a fan according to a first pressure value and a second pressure value provided by a control module in some embodiments of the present invention includes but is not limited to steps S400-S480:

[0073] Step S400: determining whether the first pressure value is greater than or equal to a first threshold;

[0074] Specifically, an embodiment of the present invention proposes a solution for jointly controlling the fan operation mode using a first pressure value and a second pressure value. The solution specifically detects the first pressure value on the exhaust side of the compressor first, and then detects the second pressure value on the suction side of the compressor. The details are explained below.

[0075] In this step S400, the first pressure value of the exhaust side of the compressor is detected. Figure 3 In the scheme of controlling the fan using the first pressure value, the first pressure value obtained in step S100 is compared with a preset first threshold value, and the first threshold value is used to indicate whether the air-conditioning system is currently in a state of excessively high pressure.

[0076] When the first pressure value is greater than or equal to the first threshold, it means that the current exhaust pressure of the compressor is too high, and the fan needs to be shut down or the wind speed needs to be reduced; conversely, when the first pressure value is less than the first threshold, it means that the current exhaust pressure of the compressor is in the normal range or the exhaust pressure is too low, and the fan needs to maintain the current wind speed or increase the wind speed.

[0077] It should be noted that the first threshold is used to indicate whether the current exhaust pressure of the compressor is too high. Therefore, for different air-conditioning systems, the value of the first threshold may be different. The same applies to the second threshold, third threshold and fourth threshold mentioned below. These thresholds can be set accordingly according to different air-conditioning systems.

[0078] Specifically, for example, the first threshold may be set to 3.3 MPa, the second threshold may be set to 3.7 MPa, the third threshold may be set to 0.9 MPa, and the fourth threshold may be set to 0.7 MPa.

[0079] Step S410: When the first pressure value is greater than or equal to the first threshold, determine whether the first pressure value is greater than or equal to the second threshold;

[0080] Specifically, when the first pressure value is greater than or equal to the first threshold, it indicates that the current compressor exhaust pressure is too high. However, the first threshold alone cannot indicate whether the compressor exhaust pressure is already at an extremely high level and whether the fan needs to be shut down immediately, or whether the current situation can be alleviated by reducing the fan speed. Therefore, a second threshold is set to indicate that the compressor exhaust pressure has reached the maximum critical value and the fan needs to be shut down immediately. Therefore, the second threshold is greater than the first threshold.

[0081] Step S420: When the first pressure value is greater than or equal to the second threshold, determine and control the operation mode of the fan to be the first mode;

[0082] Specifically, according to the content of step S410, when the first pressure value is greater than or equal to the second threshold value, indicating that the exhaust pressure of the compressor has reached the highest critical value, the operating mode of the fan is determined to be the first mode, that is, the fan is shut down immediately to avoid the compressor failure due to excessive high pressure.

[0083] It can be understood that, since the two pressure values ​​are collected once every first time period in the embodiment of the present invention, changes in the fan operation mode are changes to the current operation mode of the fan.

[0084] Step S430: When the first pressure value is less than the second threshold, determine and control the operation mode of the fan to be the second mode;

[0085] Specifically, according to the content of step S410, when the first pressure value is greater than or equal to the second threshold value, it indicates that the problem of excessive exhaust pressure of the compressor can be solved by reducing the wind speed of the fan. Therefore, the operating mode of the fan is determined to be the second mode, that is, reducing the wind speed of the fan. The specific mode of reducing the wind speed has been described in detail in the above content and will not be repeated here.

[0086] It can be understood that since the embodiment of the present invention re-acquires the first pressure value and the second pressure value every first time period, when the fan is in the second mode of operation, the next sampling moment arrives, and the first pressure value and the second pressure value are re-acquired. When the first pressure value and the second pressure value are both in the normal range, that is, the first pressure value is less than the first threshold value, and the second pressure value is less than the third threshold value and greater than or equal to the fourth threshold value, the fan is controlled to enter the third mode from the second mode, that is, to maintain the current wind speed operation.

[0087] Through steps S400-S430, the embodiment of the present invention proposes a solution for controlling the fan when the first pressure value is relatively high (the high pressure on the compressor exhaust side is too high). The following describes a solution for controlling the fan when the first pressure value is relatively low.

[0088] Step S440: When the first pressure value is less than the second threshold, determine whether the second pressure value is greater than or equal to a third threshold;

[0089] Specifically, when the first pressure value is less than the second threshold, indicating that the pressure on the compressor's exhaust side is within a normal range or relatively low, the fan's operating status is then determined in conjunction with the second pressure value. In this embodiment of the present invention, the third threshold indicates whether the compressor is currently experiencing excessively high low-pressure conditions. When the second pressure value is greater than or equal to the third threshold, indicating that the low-pressure on the compressor's intake side is excessively high, the fan needs to enter the first mode or the second mode. When the second pressure value is less than the third threshold, indicating that the low-pressure on the compressor's intake side is excessively low or within a normal range, the fan needs to enter the third mode or the fourth mode.

[0090] Step S450: When the second pressure value is greater than or equal to the third threshold, determine and control the operation mode of the fan to be the second mode;

[0091] Specifically, when the second pressure value is greater than or equal to the third threshold value, the compressor low pressure is too high, and the wind speed of the fan needs to be reduced, so the fan is controlled to operate in the second mode.

[0092] Step S460: When the second pressure value is continuously greater than or equal to the third threshold value after the second time period, determine and control the operation mode of the fan to be adjusted to the first mode;

[0093] Specifically, as mentioned above, the embodiment of the present invention reacquires the pressure value every first time period to determine the operating state of the fan for the next time period. In step S450, when the low pressure on the compressor suction side is too high, the fan operates in the second mode, that is, the wind speed is reduced. If, after the second time period, the second pressure value remains greater than or equal to the third threshold, that is, reducing the wind speed has little or no effect on the high low pressure condition of the compressor, the fan is controlled to enter the first mode, that is, the fan is turned off, to save system energy efficiency.

[0094] It is understood that the second time duration should be greater than or equal to the first time duration, allowing the impact of changes in fan speed on compressor pressure to be detected over a longer period of time. However, to prevent the compressor from operating under excessively low pressure for a long period of time, the second time duration should not be set too long. After the fan is turned off, the air conditioning system can send a corresponding prompt to the user based on the current situation, reminding the user to check for malfunctions in the air conditioning system.

[0095] Step S470: When the second pressure value is less than the third threshold, determine whether the second pressure value is greater than or equal to a fourth threshold;

[0096] Specifically, in an embodiment of the present invention, the fourth threshold value indicates whether the low pressure on the suction side of the compressor is in a normal range. If the second pressure value is less than the third threshold value and greater than or equal to the fourth threshold value, it means that the current pressure on the suction side of the compressor is in a normal state; similarly, if the second pressure value is less than the fourth threshold value, it means that the current pressure on the suction side of the compressor is too low.

[0097] Step S480: When the second pressure value is less than the third threshold value and greater than or equal to the fourth threshold value, determine and control the operation mode of the fan to be the third mode;

[0098] Specifically, based on the contents of step S470, the second pressure value can be measured using a fourth threshold. When the second pressure value is less than the third threshold and greater than or equal to the fourth threshold, the fan's operating mode is determined to be the third mode, meaning the fan maintains its current wind speed. In embodiments where the wind speed is measured by gear position, the fan maintains its current wind speed and continues to operate. In other embodiments, where the fan's wind speed varies uniformly, the fan continues to operate at its current wind speed.

[0099] Step S490: When the second pressure value is less than a fourth threshold, determining and controlling the operation mode of the fan to be the fourth mode;

[0100] Specifically, when the second pressure value is less than the fourth threshold, indicating that the compressor is currently in a low-pressure state, the fan is controlled to enter the fourth mode of operation, which increases the current wind speed. Increasing the fan speed helps to increase the compressor pressure, preventing the air conditioner outdoor unit from being in a low wind speed environment for a long time when heating, which can cause frequent frost on the heat exchanger, affecting heating efficiency and reducing system energy efficiency.

[0101] It can be understood that, in the embodiment of the present invention, the first pressure value and the second pressure value are reacquired every first time period. When the fan is in the fourth mode of operation, the next sampling moment arrives, and the first pressure value and the second pressure value are reacquired. When the first pressure value and the second pressure value are both in the normal range, that is, the first pressure value is less than the first threshold value, and the second pressure value is less than the third threshold value and greater than or equal to the fourth threshold value, the fan does not need to continue to increase the wind speed, and the fan is controlled to enter the third mode from the fourth mode, that is, to maintain the current wind speed.

[0102] Through steps S400-S490, an embodiment of the present invention proposes a scheme for controlling the operating mode of the fan using a first pressure value on the exhaust side of the compressor and a second pressure value on the intake side. While preventing the high pressure of the compressor from being too high (that is, the first pressure value is smaller than the first threshold), the low pressure on the intake side of the compressor (that is, the second pressure value) is used to effectively control the wind speed of the fan.

[0103] First, it enables the fan to operate reliably; secondly, when the low pressure is too low due to a compressor failure or the low pressure fluctuates due to the fan speed switching, the fan speed can be effectively adjusted, while reducing the frequent frosting of the air-conditioning outdoor unit due to the low fan speed, avoiding the need for frequent defrosting of the air-conditioning outdoor unit, and effectively saving system energy consumption; in addition, since the air-conditioning outdoor unit does not often enter the defrost mode, the air-conditioning outdoor unit can operate stably for a long time in the heating mode, reducing the indoor temperature fluctuation and providing users with a good heating experience.

[0104] In some embodiments, the above step S210 further includes a step of controlling the fan with a second pressure value. Figure 5 , Figure 5 A flow chart of steps for a control module to control a fan according to a second pressure value provided in some embodiments of the present invention, the method including but not limited to steps S500-S550:

[0105] Step S500: determining whether the second pressure value is greater than or equal to a third threshold;

[0106] Specifically, the embodiment of the present invention also includes a solution of controlling the fan using the second pressure value.

[0107] Similar to the two control schemes described above (controlling the fan using the first pressure value and controlling the fan using the first pressure value and the second pressure value), Figure 5 The presented solution is to control the fan to enter one of the first mode, second mode, third mode or fourth mode according to the second pressure value, thereby adjusting the fan speed and maintaining the normal operating pressure of the compressor.

[0108] Therefore, the definitions of the first mode, second mode, third mode, and fourth mode are the same as those mentioned above, and the definitions of the third threshold and fourth threshold are also the same as those mentioned above, and will not be repeated here. It is understandable that the values ​​of the third threshold and fourth threshold may vary in different control schemes and different air conditioning systems.

[0109] In this step S500, when the second pressure value is greater than or equal to the third threshold, it indicates that the compressor is in a state of too high low pressure; and when the second pressure value is less than the third threshold, it indicates that the suction pressure of the compressor is in a normal range or in a state of too low low pressure.

[0110] Step S510: When the second pressure value is greater than or equal to the third threshold, determine and control the operation mode of the fan to be the first mode or the second mode;

[0111] Specifically, when the second pressure value is greater than or equal to the third threshold, the compressor suction pressure is too high, and the fan needs to be shut down or the fan speed needs to be reduced. That is, the operation mode of the fan can be determined as the first mode or the second mode.

[0112] In some embodiments, the wind turbine may randomly select the first mode or the second mode to enter under the current condition, while in other embodiments, the wind turbine may determine the operating status through steps S520 - S530 .

[0113] Step S520: When the second pressure value is greater than or equal to the third threshold, determine and control the operation mode of the fan to be the second mode;

[0114] Specifically, when it is detected that the second pressure value is greater than or equal to the third threshold, it is determined that the fan operates in the second mode, that is, the wind speed is reduced to reduce the suction pressure of the compressor.

[0115] Step S530: When the third time period has passed and the second pressure value is continuously greater than or equal to the third threshold, determining and controlling the operation mode of the fan to be adjusted to the first mode;

[0116] Specifically, the third duration is the maximum duration the compressor is allowed to operate in the presence of excessively high low pressure. If, after the third duration, the second pressure value remains consistently greater than or equal to the third threshold, increasing the fan speed will have little effect on improving the compressor's excessively high low pressure. To prevent compressor failure, the fan is controlled to enter the first mode, i.e., shut down.

[0117] S540: When the second pressure value is less than the third threshold value and the second pressure value is greater than or equal to the fourth threshold value, determine and control the operation mode of the fan to be the third mode;

[0118] Specifically, when the second pressure value is less than the third threshold and greater than or equal to the fourth threshold, it indicates that the current suction pressure of the compressor is in the normal range, so the current operating mode of the fan is determined to be the third mode, that is, maintaining the current wind speed.

[0119] S550: When the second pressure value is less than a fourth threshold, determine and control the operation mode of the fan to be a fourth mode;

[0120] Specifically, when the second pressure value is less than the fourth threshold, it means that the current suction pressure of the compressor is too low, and the suction pressure of the fan needs to be increased to avoid frequent frosting of the air-conditioning outdoor unit. Therefore, the fan needs to be controlled to enter the fourth mode, that is, to increase the current wind speed of the fan.

[0121] It should be noted that due to the structure of the fan itself, the fan objectively has a maximum wind speed. It can be understood that no matter under which control scheme, when the fan in the embodiment of the present invention enters the fourth mode of operation and increases the current wind speed, it is possible that the current wind speed is already the maximum wind speed and cannot be further increased. At this time, the fan will continue to operate at the maximum wind speed. The control method proposed in the embodiment of the present invention will still detect the pressure of the compressor every first time period. If the fan continues to operate at the highest wind speed and there is still at least one of the high pressure being too low or the low pressure being too low, the air-conditioning system can send a prompt to the user to remind the user to check whether the air conditioner has a fault.

[0122] Similarly, it is understandable that in some embodiments, the wind speed of the fan is measured in gears. These fans may have a minimum operating wind speed, that is, the minimum wind speed under normal operation of the fan. Then, in an embodiment of the present invention, the fan will reduce the wind speed after entering the second mode. It may happen that the wind speed has reached the minimum operating wind speed, but the compressor still needs to lower the wind speed. In steps S460 and S530, it is proposed to control the fan to forcibly enter the first mode after the second or third time period, that is, to force the fan to shut down. If the fan is already at the lowest operating wind speed, and the time to enter the fourth mode has not yet reached the second or third time period, the fan can be allowed to maintain operation at the lowest operating wind speed until the time to enter the fourth mode reaches the second or third time period, and then the fan is forced to shut down.

[0123] Through steps S500-S550, the embodiment of the present invention proposes a scheme for controlling the operation mode of the fan with the second pressure value on the suction side of the compressor. When the low pressure is too low due to a compressor failure or the low pressure fluctuates due to the wind speed switching of the fan, the fan speed can be effectively adjusted to ensure the reliable operation of the fan. At the same time, it reduces the frequent frosting of the air-conditioning outdoor unit caused by the low wind speed of the fan, and effectively improves the energy efficiency of the system.

[0124] In the above content, the embodiment of the present invention describes the situation where the operating mode of the fan is controlled by using the compressor pressure during normal operation of the fan. When the fan just starts to run, the initial wind speed of the fan needs to be determined first.

[0125] Reference Figure 6 , Figure 6 A flowchart of the steps for starting a fan provided in an embodiment of the present invention includes but is not limited to steps S600-S620:

[0126] S600: In response to a second instruction, obtaining an ambient temperature at a location where the fan is located, the second instruction being used to indicate that the operating mode of the air-conditioning system is a heating mode;

[0127] Specifically, the second instruction is used to indicate that the mode of the air-conditioning system is heating mode. It can be sent to the air-conditioning system by the user using an infrared remote control, or sent to the air-conditioning system through a mobile terminal such as a mobile phone through WiFi, Bluetooth, etc., or controlled through the control panel of the air-conditioning system to enter the heating mode.

[0128] In addition, as smart homes and big data become increasingly popular, the Internet of Things can also monitor the user's return home and send a second instruction to the air-conditioning system in advance, causing the air-conditioning system to enter heating mode.

[0129] The embodiment of the present invention does not impose any specific limitation on the method for generating the second instruction.

[0130] In this step S600, the signal receiving module responds to the second instruction and collects the ambient temperature of the external environment where the fan is located. The collection method can be to perform temperature detection through one or more temperature sensors set on the fan housing to determine the ambient temperature.

[0131] S610, determining the initial wind speed of the fan according to the ambient temperature;

[0132] Specifically, the initial wind speed of the fan is determined based on the collected ambient temperature. For example, if the outdoor temperature is low and the heat exchanger in the air conditioner outdoor unit needs to exchange as much air as possible with the outside air, the fan is controlled to start at a higher initial wind speed.

[0133] It is understandable that the initial wind speed may be determined based on a mapping table between ambient temperature and initial wind speed, or may be determined based on a preset formula, function, or the like.

[0134] S620: When the wind turbine continuously operates at the initial wind speed for a period greater than or equal to a fourth period, trigger the first instruction;

[0135] Specifically, when the wind speed stabilizes at the selected initial wind speed after the fan is started, when the time the fan runs at the initial wind speed reaches or exceeds the fourth time, the first instruction is triggered. According to step S200, the first instruction is used to control the operation mode of the fan.

[0136] It can be understood that when the fan obtains the first pressure value and the second pressure value for the first time and determines that the fan needs to increase the wind speed or decrease the wind speed, the initial wind speed of the fan is adjusted, and each subsequent speed increase or speed decrease is based on the current operating wind speed of the fan.

[0137] Through steps S600 to S620, the embodiment of the present invention illustrates the process of determining the initial wind speed when the wind turbine is just started.

[0138] pass Figure 3 、 Figure 4 and Figure 5 The method steps of the present invention are as follows: an embodiment of the present invention provides a method for controlling a fan, wherein the method specifically comprises the following steps: a signal receiving module responds to a first instruction, collects a first pressure value on the exhaust side and a second pressure value on the suction side of the compressor at each first time period, and compares the first pressure value and the second pressure value with a set pressure threshold value.

[0139] An embodiment of the present invention lists a case where at least one of the first pressure value and the second pressure value is compared with at least one of the first threshold value, the second threshold value, the third threshold value and the fourth threshold value, and determines, based on the comparison result, that the operating mode of the fan is one of the first mode, the second mode, the third mode or the fourth mode.

[0140] Compared with the solution in the related art that only considers the high pressure on the exhaust side of the compressor, the embodiment of the present invention comprehensively considers the high pressure on the exhaust side of the compressor and the low pressure on the suction side of the compressor when controlling the fan to control the operation mode of the fan, which can adapt to the cooling mode and heating mode of the air-conditioning system respectively, making the operation of the air-conditioning outdoor unit more reliable; in addition, when the air-conditioning system is in heating mode in winter, the embodiment of the present invention can also effectively reduce the low-pressure fluctuation or excessive low pressure caused by the adjustment of the fan operation mode, thereby giving users a good user experience.

[0141] The following describes one embodiment of the present invention based on an actual usage scenario of an air conditioner and in combination with a fan control method proposed in an embodiment of the present invention.

[0142] In cold winter, people send a second command to the air-conditioning system through a remote control or mobile phone, instructing the air-conditioning system to enter heating mode. In response to the second command, the ambient temperature at the location of the fan is obtained through one or more temperature sensors. Based on the obtained ambient temperature and a preset mapping table of ambient temperature and initial wind speed, the initial wind speed of the fan can be determined.

[0143] When the fan runs at a stable initial wind speed for more than a fourth period of time, the first instruction is triggered, indicating that the operation mode of the fan starts to be controlled according to the pressure of the compressor.

[0144] In response to the first instruction, the signal receiving module collects the first pressure value and the second pressure value once every first time period. In the scheme in which the control module jointly controls the fan according to the first pressure value and the second pressure value, the relationship between the first pressure value and the first threshold value and the second threshold value is first determined. The second threshold value is greater than the first threshold value. When the first pressure value is greater than the first threshold value, it indicates that the exhaust pressure of the compressor is too high. When the first pressure value is greater than or equal to the second threshold value, the fan is controlled to enter the first mode, that is, the fan is immediately shut down; when the first pressure value is less than the second threshold value and greater than or equal to the first threshold value, the fan is controlled to operate in the second mode, that is, the current wind speed of the fan is reduced, specifically, the windshield of the fan can be lowered. When the exhaust pressure of the compressor has not dropped to the normal range after the second time period, the fan is controlled to enter the first mode, that is, the fan is shut down.

[0145] When the first pressure value is less than the first threshold, the suction pressure of the compressor is considered to determine the size relationship between the second pressure value and the third and fourth thresholds. The third threshold is greater than the fourth threshold. When the second pressure value is greater than or equal to the third threshold, it indicates that the suction pressure of the compressor is too high. When the second pressure value is less than the fourth threshold, it indicates that the exhaust pressure of the compressor is too low. Therefore, when the second pressure value is greater than or equal to the third threshold, the fan is controlled to enter the second mode, that is, to reduce the current wind speed of the fan; if after the third period of time, the exhaust pressure of the compressor still does not drop to the normal range, the fan is controlled to enter the first mode, that is, to immediately shut down the fan; when the second pressure value is less than the third threshold and greater than or equal to the fourth threshold, it indicates that the suction pressure and exhaust pressure of the compressor are both in the normal range, and the fan runs in the third mode, that is, maintains the current windshield operation; when the second pressure value is less than the fourth threshold, the fan is controlled to enter the fourth mode, that is, to increase the current windshield.

[0146] The first pressure value and the second pressure value of the compressor are periodically collected to update the operating status of the fan so that the fan can operate reliably. In addition, when the air-conditioning system is in heating mode in winter, the embodiment of the present invention can also effectively reduce the low-pressure fluctuation or excessive low pressure caused by the adjustment of the fan operating mode, thereby causing the air-conditioning system to defrost frequently, without affecting the energy efficiency of the system, giving users a good user experience.

[0147] In addition, the present invention also provides a control device for a fan, referring to Figure 7 , Figure 7 A schematic diagram of a control device for an air conditioner outdoor unit provided in some embodiments of the present invention, wherein the control device 700 includes at least one processor 710 and at least one memory 720 for storing at least one program; Figure 7 A processor and a memory are taken as an example.

[0148] The processor and memory can be connected via a bus or other means. Figure 7The bus connection is taken as an example.

[0149] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory and may also include a non-transient memory, such as at least one disk storage device, a flash memory device or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely located relative to the processor, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0150] Another embodiment of the present invention further provides a device, which can be used to execute the control method in any of the above embodiments.

[0151] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0152] In addition, an embodiment of the present invention also provides an air-conditioning system, which can be a household air-conditioning system with an air-conditioning outdoor unit or a multi-split air-conditioning system. The air-conditioning system is installed with a control device for the air-conditioning outdoor unit provided by an embodiment of the present invention, and can be used to execute the control method for the air-conditioning outdoor unit provided by an embodiment of the present invention. When the air-conditioning system is in heating mode, the wind speed of the fan is controlled according to the first pressure value on the exhaust side of the compressor and the second pressure value on the intake side, so that the fan can operate reliably.

[0153] An embodiment of the present invention further discloses a computer storage medium storing a program executable by a processor, wherein the program executable by the processor is used to implement the control method of the air conditioner outdoor unit proposed by the present invention when executed by the processor.

[0154] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0155] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A method for controlling an outdoor unit of an air conditioner, wherein the outdoor unit comprises a fan and a compressor, wherein: The control method includes: In response to a first instruction, obtaining a first pressure value on the exhaust side of the compressor and a second pressure value on the suction side of the compressor at first time intervals, wherein the first instruction is used to determine an operating mode of the fan; determining and controlling an operating mode of the fan according to at least one of the first pressure value and the second pressure value and a preset pressure threshold; The determining and controlling the operation mode of the fan according to at least one of the first pressure value and the second pressure value and a preset pressure threshold comprises: When the first pressure value is greater than or equal to a first threshold, when the first pressure value is greater than or equal to a second threshold, determining and controlling the operation mode of the fan to be the first mode; when the first pressure value is less than the second threshold, determining and controlling the operation mode of the fan to be the second mode; When the first pressure value is less than a first threshold, when the second pressure value is less than a third threshold and greater than or equal to a fourth threshold, determining and controlling the operation mode of the fan to be the third mode; when the second pressure value is less than the fourth threshold, determining and controlling the operation mode of the fan to be the fourth mode; Among them, the second threshold, the first threshold, the third threshold and the fourth threshold decrease in sequence, the first mode is that the fan is turned off, the second mode is that the fan reduces the current wind speed, the third mode is that the fan maintains the current wind speed, and the fourth mode is that the fan increases the current wind speed.

2. The control method of the air conditioner outdoor unit according to claim 1, characterized in that: The determining and controlling the operation mode of the fan according to at least one of the first pressure value and the second pressure value and a preset pressure threshold further includes: In the case where the first pressure value is less than a first threshold value, when the second pressure value is greater than or equal to the third threshold value, the operation mode of the fan is determined and controlled to be the first mode or the second mode.

3. The control method of the air conditioner outdoor unit according to claim 2, characterized in that: When the second pressure value is greater than or equal to the third threshold, determining and controlling the operation mode of the fan to be the first mode or the second mode includes: When the second pressure value is greater than or equal to the third threshold, determining and controlling the operation mode of the fan to be the second mode; When the second time period has passed and the second pressure value is continuously greater than or equal to the third threshold, it is determined and controlled that the operation mode of the fan is adjusted to the first mode.

4. The control method of the air conditioner outdoor unit according to claim 2, characterized in that: The control method further includes: When the operation mode of the fan is the second mode, obtaining the first pressure value and the second pressure value again after the first time period; If the first pressure value is less than the first threshold value, and the second pressure value is less than the third threshold value and greater than or equal to the fourth threshold value, the operation mode of the fan is determined and controlled to be adjusted to the third mode.

5. The control method of the air conditioner outdoor unit according to claim 2, characterized in that: The control method further includes: When the operation mode of the fan is the fourth mode, obtaining the first pressure value and the second pressure value again after the first time period; If the first pressure value is less than the first threshold value, and the second pressure value is less than the third threshold value and greater than or equal to the fourth threshold value, the operation mode of the fan is determined and controlled to be adjusted to the third mode.

6. The control method of the air conditioner outdoor unit according to claim 1, characterized in that: The pressure threshold includes a third threshold and a fourth threshold, the fourth threshold is smaller than the third threshold, and determining and controlling the operation mode of the fan according to at least one of the first pressure value and the second pressure value and a preset pressure threshold includes: When the second pressure value is greater than or equal to the third threshold, determining and controlling the operation mode of the fan to be the first mode or the second mode; When the second pressure value is less than the third threshold value and the second pressure value is greater than or equal to the fourth threshold value, determining and controlling the operation mode of the fan to be the third mode; When the second pressure value is less than the fourth threshold, determining and controlling the operation mode of the fan to be the fourth mode; Among them, the first mode is that the fan is turned off, the second mode is that the fan reduces the current wind speed, the third mode is that the fan maintains the current wind speed, and the fourth mode is that the fan increases the current wind speed.

7. The control method of the air conditioner outdoor unit according to claim 6, characterized in that: When the second pressure value is greater than or equal to the third threshold, determining and controlling the operation mode of the fan to be the first mode or the second mode includes: When the second pressure value is greater than or equal to the third threshold, determining and controlling the operation mode of the fan to be the second mode; When the third time period has passed and the second pressure value is continuously greater than or equal to the third threshold, it is determined and controlled that the operation mode of the fan is adjusted to the first mode.

8. The control method of an air conditioner outdoor unit according to any one of claims 1 to 7, characterized in that: The control method further includes: In response to a second instruction, obtaining an ambient temperature at a location where the fan is located, wherein the second instruction is used to indicate that the operating mode of the air-conditioning system is a heating mode; determining an initial wind speed of the fan according to the ambient temperature; When the duration for which the wind turbine continues to operate at the initial wind speed is greater than or equal to a fourth duration, the first instruction is triggered.

9. A control device for an air-conditioning outdoor unit, the air-conditioning outdoor unit comprising a fan and a compressor, characterized in that: The control device comprises: a signal receiving module, configured to obtain a first pressure value on the exhaust side of the compressor and a second pressure value on the suction side of the compressor at first time intervals in response to a first instruction, wherein the first instruction is used to determine an operating mode of the fan; a control module, configured to determine and control an operation mode of the fan according to at least one of the first pressure value and the second pressure value and a preset pressure threshold; The determining and controlling the operation mode of the fan according to at least one of the first pressure value and the second pressure value and a preset pressure threshold comprises: When the first pressure value is greater than or equal to a first threshold, when the first pressure value is greater than or equal to a second threshold, determining and controlling the operation mode of the fan to be the first mode; when the first pressure value is less than the second threshold, determining and controlling the operation mode of the fan to be the second mode; When the first pressure value is less than a first threshold, when the second pressure value is less than a third threshold and greater than or equal to a fourth threshold, determining and controlling the operation mode of the fan to be the third mode; when the second pressure value is less than the fourth threshold, determining and controlling the operation mode of the fan to be the fourth mode; Among them, the second threshold, the first threshold, the third threshold and the fourth threshold decrease in sequence, the first mode is that the fan is turned off, the second mode is that the fan reduces the current wind speed, the third mode is that the fan maintains the current wind speed, and the fourth mode is that the fan increases the current wind speed.

10. A control device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When at least one of the programs is executed by at least one of the processors, the at least one processor implements the control method for the air-conditioning outdoor unit according to any one of claims 1 to 8.

11. An air conditioning system, characterized in that: Comprising the control device as claimed in claim 10.

12. A computer storage medium storing a program executable by a processor, characterized in that: The program executable by the processor is used to implement the control method of the air-conditioning outdoor unit according to any one of claims 1 to 8 when executed by the processor.

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