Control method and device for outdoor unit of air conditioner, air conditioner and storage medium

Abstract

The invention relates to an air conditioner outdoor unit control method and device, an air conditioner and a storage medium, and the method comprises the steps that under the condition that the air conditioner operates in a heating mode and the outdoor unit environment temperature is lower than the preset temperature, the first variable quantity and the second variable quantity of the weight of an indoor unit and the weight of an outdoor unit in unit time are obtained; wherein the first variable quantity refers to the difference value between the weight of the outdoor unit at the ending moment of the unit time and the weight of the outdoor unit at the starting moment of the unit time in the frosting process of the outdoor unit; the second variable quantity refers to a difference value between the current of the outdoor unit at the starting moment of the unit time and the current of the outdoor unit at the ending moment of the unit time in the frosting process of the outdoor unit; and the gear of the outdoor unit is adjusted according to the first variable quantity and the second variable quantity, so that the frosting speed is slowed down. By means of the air conditioner outdoor unit, the problem that when an air conditioner outdoor unit in the related technology frosts, the fan blades are blocked in the rotating process, and consequently the fan blades are damaged is solved.

Description

Technical Field

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

[0002] It is normal for the outdoor unit of the air conditioner to be frosted in the winter heating mode. When the evaporator temperature drops to 0℃ or below, the humid outdoor air will condense into frost on the evaporator. Most air conditioners have an automatic defrost function. When the frost reaches a certain level, the air conditioner will automatically start the defrost mode to ensure normal operation. However, if the outdoor unit of the air conditioner is severely frosted and the automatic defrost is not performed in time, the frost will gradually accumulate and thicken, causing the fan blades to be obstructed or unbalanced when rotating, and thus damaged.

[0003] There is currently no effective solution to the above-mentioned technical problems in the relevant technologies. Summary of the invention

[0004] The present application provides a control method and device for an air conditioner outdoor unit, an air conditioner and a storage medium to solve the problem in the related art that when frost occurs on the air conditioner outdoor unit, the fan blades are hindered from rotating and damaged.

[0005] In a first aspect, the present application provides a method for controlling an outdoor unit of an air conditioner, comprising: when the air conditioner is operating in a heating mode and the ambient temperature of the outdoor unit is lower than a preset temperature, obtaining a first change in the weight of the outdoor unit and a second change in the weight of the outdoor unit per unit time; wherein the first change refers to the difference between the weight of the outdoor unit at the end of the unit time and the weight of the outdoor unit at the beginning of the unit time during the frosting process of the outdoor unit; the second change refers to the difference between the current of the outdoor unit at the beginning of the unit time and the current of the outdoor unit at the end of the unit time during the frosting process of the outdoor unit; and adjusting the gear of the outdoor unit according to the first change and the second change to slow down the frosting speed.

[0006] Optionally, adjusting the gear position of the external unit according to the first change amount and the second change amount includes: lowering the gear position of the external unit when the first change amount represents an increase in weight of the external unit per unit time and the second change amount represents a decrease in current per unit time.

[0007] Optionally, when the first change represents an increase in the weight of the external unit per unit time, and the second change represents a decrease in the current per unit time, lowering the gear of the external unit includes: when the first change is greater than a first preset weight, and the second change is greater than a first preset current, lowering the gear of the external unit by one level; when the weight of the external unit continues to increase until the first change is greater than a second preset weight, and the current continues to decrease until the second change is greater than a second preset current, continuing to lower the gear of the external unit by one level; wherein the second preset weight is greater than the first preset weight, and the second preset current is greater than the first preset current.

[0008] Optionally, the method also includes: determining that the external unit has an operating failure when the weight of the external unit continues to increase until the first change is greater than a third preset weight, and the current continues to decrease until the second change is greater than a third preset current; wherein the third preset weight is greater than the second preset weight, and the third preset current is greater than the second preset current.

[0009] Optionally, after lowering the gear position of the outdoor unit, the method includes: when the first change amount represents a reduction in weight of the outdoor unit per unit time, and the second change amount represents an increase in current per unit time, increasing the gear position of the outdoor unit to accelerate the defrosting speed.

[0010] Optionally, when the air conditioner is operated in a heating mode and the ambient temperature of the outdoor unit is lower than a preset temperature, a first change in the weight of the outdoor unit per unit time and a second change in the weight of the outdoor unit per unit time are obtained, including: when the ambient temperature is higher than the second preset temperature and lower than or equal to the first preset temperature, starting the defrost mode to defrost the air conditioner; and after the defrost is completed, controlling the air conditioner to operate in a heating mode, obtaining the first change in the weight of the outdoor unit per unit time and a second change in the weight of the outdoor unit per unit time; or, when the ambient temperature is higher than a third preset temperature and lower than or equal to the second preset temperature, starting the defrost mode to defrost the air conditioner; and after the defrost is completed, controlling the air conditioner to operate in a heating mode, obtaining the first change in the weight of the outdoor unit per unit time and a second change in the weight of the outdoor unit per unit time.

[0011] Optionally, the method further includes: directly acquiring a first change amount and a second change amount of the weight of the external unit per unit time when the ambient temperature is lower than the third preset temperature.

[0012] In a second aspect, the present application provides a control device for an air-conditioning outdoor unit, comprising: a first acquisition module, for acquiring a first change in the weight of the outdoor unit and a second change in the weight of the outdoor unit per unit time, when the air-conditioning is operating in a heating mode and the ambient temperature of the outdoor unit is lower than a preset temperature; wherein the first change refers to the difference between the weight of the outdoor unit at the end of the unit time and the weight of the outdoor unit at the beginning of the unit time during the frosting process of the outdoor unit; the second change refers to the difference between the current of the outdoor unit at the beginning of the unit time and the current of the outdoor unit at the end of the unit time during the frosting process of the outdoor unit; and a first control module, for adjusting the gear of the outdoor unit according to the first change and the second change to slow down the frosting speed.

[0013] In a third aspect, the present application provides an air conditioner, comprising a control device, the control device comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; at least one memory connected to the at least one bus, wherein the processor is configured to execute the control method of the air conditioner outdoor unit described in the above-mentioned first aspect of the present application.

[0014] In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the control method of the air conditioner outdoor unit described in the first aspect of the present application.

[0015] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: in the embodiment of the present application, when the air conditioner is running in the heating mode, if the current air conditioner outdoor unit begins to frost, the change in the weight of the air conditioner outdoor unit per unit time is obtained in real time, and the change in the current of the corresponding air conditioner outdoor unit per unit time is obtained in real time, and the gear of the air conditioner outdoor unit is adjusted based on these two changes. For example, if the current frost is increasing, the gear of the outdoor unit can be appropriately reduced to slow down the frost speed; thus, it can be avoided that the outdoor unit is still running at the current gear when the frost is increasing, so that the outdoor unit fan blade cannot run at the current gear under the current weight, thereby damaging the fan blade. It can be seen that through the method of the embodiment of the present application, based on the real-time acquisition of the change in the weight of the outdoor unit and the change in the current, the gear of the air conditioner outdoor unit is adjusted in real time to slow down the frost speed and avoid the air conditioner outdoor unit fan blade being damaged due to the heavy weight of the frost, thereby solving the problem in the related art that when the air conditioner outdoor unit is frosted, the fan blade is hindered from rotating and damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 A flow chart of a method for controlling an outdoor unit of an air conditioner provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of an air conditioner provided in an embodiment of the present application;

[0021] Figure 3 A flow chart of a defrosting control method for an external fan blade provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of a control device for an air conditioner outdoor unit provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of the air conditioner control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0026] In order to solve the problem in the related art that when frost occurs on the outdoor unit of the air conditioner, the fan blades are hindered from rotating and thus damaged, the present application provides a control method for the outdoor unit of the air conditioner, such as Figure 1 As shown, the steps of the method include:

[0027] Step 101, when the air conditioner is running in a heating mode and the ambient temperature of the outdoor unit is lower than a preset temperature, a first change amount and a second change amount of the weight of the outdoor unit per unit time are obtained; wherein the first change amount refers to the difference between the weight of the outdoor unit at the end time of the unit time and the weight of the outdoor unit at the beginning time of the unit time during the frosting process of the outdoor unit; the second change amount refers to the difference between the current of the outdoor unit at the beginning time of the unit time and the current of the outdoor unit at the end time of the unit time during the frosting process of the outdoor unit;

[0028] In a specific example, the preset temperature may be 4°C, that is, when the ambient temperature is usually below 4°C, the outdoor unit of the air conditioner may begin to frost, and the weight of the fan blades of the outdoor unit of the air conditioner will increase due to frost. However, the value of the preset temperature may be different in different application scenarios, that is, the preset temperature may be set according to actual needs.

[0029] In addition, the first variation refers to the weight change of the air conditioner outdoor unit during the frosting process. The heavier the weight of the air conditioner outdoor unit, the greater the resistance of the outdoor unit fan blades, and the smaller the corresponding current of the air conditioner outdoor unit. It can be seen that the heavier the frosting, the smaller the corresponding outdoor unit current. That is, the larger the first variation, the faster the frosting weight of the outdoor unit increases per unit time, and the smaller the corresponding current of the air conditioner outdoor unit, that is, the larger the second variation.

[0030] Step 102, adjusting the gear position of the outdoor unit according to the first change amount and the second change amount to slow down the frosting speed.

[0031] It should be noted that the outdoor unit of the air conditioner refers to the outdoor unit of the air conditioner, the air conditioner also includes an indoor unit, and the outdoor unit of the air conditioner includes an outdoor fan, so adjusting the gear position of the outdoor unit refers to adjusting the gear position of the outdoor fan of the outdoor unit of the air conditioner.

[0032] Through the above steps 101 and 102, when the air conditioner is running in the heating mode, if the current air conditioner outdoor unit begins to frost, the change in the weight of the air conditioner outdoor unit per unit time is obtained in real time, and the change in the current of the corresponding air conditioner outdoor unit per unit time is obtained in real time. The gear of the air conditioner outdoor unit is adjusted based on these two changes. For example, if the current frost is increasing, the gear of the outdoor unit can be appropriately lowered to slow down the frost speed; thus, the problem of still running the outdoor unit at the current gear when the frost is increasing can be avoided, so that the outdoor unit fan blades cannot run at the current gear under the current weight, thereby damaging the fan blades. It can be seen that through the embodiment of the present application, based on the real-time acquisition of the change in the weight of the outdoor unit and the change in the current, the gear of the air conditioner outdoor unit is adjusted in real time to slow down the frost speed and avoid the air conditioner outdoor unit fan blades being damaged due to the heavy weight of the frost, thereby solving the problem in the related art that when the air conditioner outdoor unit is frosted, the fan blades are hindered from rotating and damaged.

[0033] In an embodiment of the present application, it is first determined whether the current air-conditioning outdoor unit will be frosted by the ambient temperature, that is, a preset temperature is set. If the temperature is lower than the preset temperature, it indicates that the ambient temperature is low at this time and the air-conditioning outdoor unit may be frosted. Then the defrost mode of the air conditioner is started. After the defrosting is completed, since the ambient temperature is still low, the air-conditioning outdoor unit will still be frosted. At this time, it is necessary to determine whether to lower the operating gear of the air-conditioning outdoor unit by obtaining the weight of the air-conditioning outdoor unit and the current of the air-conditioning outdoor unit, so as to slow down the frosting speed while ensuring the normal operation of the fan blades of the air-conditioning outdoor unit. Based on this, the method of obtaining the first change amount and the second change amount of the weight of the outdoor unit per unit time involved in the above step 101 when the air conditioner is running in heating mode and the ambient temperature of the outdoor unit is lower than the preset temperature can further include:

[0034] Step 11, when the ambient temperature is higher than the second preset temperature and lower than or equal to the first preset temperature, start the defrost mode to defrost the air conditioner; and when the air conditioner is controlled to operate in the heating mode after the defrost is completed, obtain the first change amount and the second change amount of the outdoor unit weight per unit time;

[0035] or,

[0036] Step 12, when the ambient temperature is higher than the third preset temperature and lower than or equal to the second preset temperature, start the defrost mode to defrost the air conditioner; and after the defrost is completed, control the air conditioner to operate in the heating mode, and obtain the first change and the second change of the outdoor unit weight per unit time.

[0037] In a specific example, the first preset temperature can be set to 0°C, the second preset temperature can be set to -8°C, and the third preset temperature can be set to -15°C. The lower the ambient temperature, the more severe the frost is. In the air conditioner, the heavier the weight of the air conditioner outdoor unit, the lower the current of the air conditioner outdoor unit. At this time, the corresponding gear needs to be lowered to ensure the operation of the air conditioner outdoor unit and slow down the speed of frost formation. That is, the gear to be lowered is different at different ambient temperatures.

[0038] In addition, the method of the embodiment of the present application may also include:

[0039] Step 13: When the ambient temperature is lower than the third preset temperature, directly obtain the first change amount and the second change amount of the weight of the outdoor unit per unit time.

[0040] If the current environment is lower than the third preset temperature, such as -15℃, it means that the ambient temperature is very low at this time. At this time, the defrost function of the air conditioner is not very effective. Therefore, there is no need to defrost. The air conditioner outdoor unit and current are directly obtained to determine whether to stop the normal operation of the current air conditioner.

[0041] Based on this, in the embodiment of the present application, the method of adjusting the gear position of the outdoor unit according to the first change amount and the second change amount involved in the above step 102 may further include:

[0042] Step 21, when the first change amount represents an increase in the weight of the external unit per unit time, and the second change amount represents a decrease in the current per unit time, lowering the gear of the external unit.

[0043] It can be seen that when the first variation represents the increase in the weight of the outdoor unit per unit time, it indicates that the degree of frost on the outdoor unit of the air conditioner increases, that is, the outdoor unit of the air conditioner becomes heavier due to frost. Because the weight of the outdoor unit fan blade increases, the corresponding air volume of the outdoor unit fan blade will become smaller and smaller, and the current of the outdoor unit will also become smaller and smaller, that is, the second variation represents the current reduction per unit time at this time. In a specific example, taking a unit time of 5 minutes as an example, the weight of the outdoor unit of the air conditioner is counted every 5 minutes. If the first variation currently counted is 0.1kg, and the first variation is 0.2kg after a period of time, it indicates that the weight of the outdoor unit of the air conditioner is getting heavier and heavier at this time, and the air volume of the outdoor unit fan blade decreases due to the increase in weight, so that the current of the outdoor unit is also reduced accordingly. If at this time, the outdoor unit of the air conditioner is still operated at the previous gear, the outdoor unit of the air conditioner will not match the gear and the actual weight, that is, if the heavy outdoor unit is operated at a high gear, the outdoor unit fan blade will be damaged. Therefore, the gear can be appropriately reduced, not only can the outdoor unit be operated at a suitable gear, but also the frosting speed of the outdoor unit can be further slowed down.

[0044] In a specific application scenario, for a frosted air conditioner outdoor unit, if the weight of the outdoor unit continues to increase, the current of the outdoor unit will also continue to decrease, and the gear position should be continuously reduced. Therefore, for the above step 21, when the first change amount represents an increase in the weight of the outdoor unit per unit time, and the second change amount represents a decrease in the current per unit time, the method of reducing the gear position of the outdoor unit may further include:

[0045] Step 31, when the first change amount is greater than the first preset weight and the second change amount is greater than the first preset current, lowering the gear of the outdoor unit by one gear;

[0046] Step 32, when the weight of the external unit continues to increase until the first change amount is greater than the second preset weight, and the current continues to decrease until the second change amount is greater than the second preset current, continue to reduce the gear of the external unit by one gear;

[0047] The second preset weight is greater than the first preset weight, and the second preset current is greater than the first preset current.

[0048] For the above steps 31 and 32, in a specific example, the first preset weight is 0.2kg, the second preset weight is 0.4kg, and the first preset current is 0.5A and the second preset current is 0.8A. That is, when the first change is greater than 0.2kg and the second change is greater than 0.5A, the current gear of the air conditioner outdoor unit is downgraded by one gear. For example, if the current gear is 4, it needs to be operated at gear 3. If the weight continues to increase and the current continues to decrease, such as when the first change is greater than 0.4kg and the second change is greater than 0.8A, the current gear of the air conditioner outdoor unit is further downgraded by one gear. For example, if the current gear is 4, it continues to be downgraded to gear 3. It can be seen that in the embodiment of the present application, the gear of the air conditioner outdoor unit can be downgraded in real time according to the weight of the air conditioner outdoor unit and the change in the current of the air conditioner outdoor unit during the current frosting process to slow down the frosting speed, so that the gear of the air conditioner outdoor unit can be matched with the weight of the air conditioner outdoor unit as much as possible to avoid damage to the air conditioner outdoor unit.

[0049] Further, the above step 31 usually corresponds to the above step 11, that is, when the ambient temperature is higher than the second preset temperature and lower than or equal to the first preset temperature, the air conditioner outdoor unit and the outdoor unit current are further obtained to determine whether downshift operation is required. The above step 32 usually corresponds to the above step 12, that is, when the ambient temperature is higher than the third preset temperature and lower than or equal to the second preset temperature, the air conditioner outdoor unit and the outdoor unit current are further obtained to determine whether downshift operation is continued.

[0050] In the embodiment of the present application, if the weight of the air conditioner outdoor unit continues to increase and the current continues to decrease to the limit values, it indicates that the weight of the air conditioner outdoor unit cannot continue to operate normally, and it is necessary to report that the air conditioner has a fault. Based on this, the method of the embodiment of the present application also includes:

[0051] Step 33, when the weight of the external unit continues to increase until the first change amount is greater than the third preset weight, and the current continues to decrease until the second change amount is greater than the third preset current, determining that the external unit has an operation failure;

[0052] The third preset weight is greater than the second preset weight, and the third preset current is greater than the second preset current.

[0053] In this regard, in the specific example, the third preset weight is 0.6kg, and the third preset current is 1.5A. It can be seen that when the first change is greater than 0.6kg and the second change is greater than 1.5A, it indicates that the frost on the outdoor unit of the air conditioner has reached the limit that the air conditioner can withstand. Therefore, in this case, it can be determined that the outdoor unit is malfunctioning. At this time, the air conditioner can only be turned off first, and the air conditioner cannot be continued to run to avoid further damage to the outdoor unit.

[0054] Furthermore, after lowering the gear position of the outdoor unit, if the environment starts to heat up, the temperature rise of the environment can be used to defrost the air conditioner through the natural environment, that is, the weight of the outdoor unit of the air conditioner will be reduced accordingly due to the increase in the ambient temperature. At this time, the gear position of the outdoor unit of the air conditioner can be appropriately increased according to the change in the weight of the outdoor unit of the air conditioner to adapt to the weight of the outdoor unit of the air conditioner after the air conditioner is slowly defrosted. Therefore, the method of the embodiment of the present application may also include:

[0055] Step 41 , when the first change amount represents a decrease in the weight of the outdoor unit per unit time, and the second change amount represents an increase in the current per unit time, the gear position of the outdoor unit is increased to accelerate the defrosting speed.

[0056] It can be seen that in the embodiment of the present application, if the frost reaches a certain weight during the frosting process and does not reach the limit value that the air conditioner outdoor unit can bear, the ambient temperature begins to rise at this time. The air conditioner outdoor unit automatically defrosts due to the rise in ambient temperature, and the weight of the air conditioner outdoor unit begins to decrease at this time. At this time, the outdoor unit gear can be appropriately increased to adapt to the current weight reduction of the air conditioner outdoor unit. That is, in the embodiment of the present application, not only can the air conditioner outdoor unit gear be lowered when the weight of the air conditioner outdoor unit increases to slow down the frosting speed; but also the air conditioner outdoor unit gear can be appropriately increased when the weight of the air conditioner outdoor unit decreases to adapt to the current weight reduction to meet user needs.

[0057] The present application is explained below in conjunction with the specific implementation of the embodiment of the present application. This specific implementation provides a defrosting control method for an external unit fan blade. Based on this, in the specific implementation of the present application, by adding a pressure sensing device, the weight change of the external unit per unit time is measured to determine the degree of frosting of the external unit fan blade, and the frosting condition of the external unit during heating operation is divided and determined under different external loops, so as to accurately control whether the external unit fan blade can operate reliably; according to the linear relationship between the current and the speed of the DC motor, when the fan blade is frosted, the resistance of the fan blade increases, and the frosting condition of the external unit fan blade is determined by the current change of the DC motor, so as to optimize the time when the system enters defrosting and the defrosting time, and achieve the purpose of reliable operation of the external unit fan blade; the current is used to determine the frosting load of the fan blade to avoid damage to the fan blade due to frosting of the fan blade.

[0058] The air conditioning system in this specific embodiment is as follows Figure 2 As shown, it includes two parts, an indoor unit and an outdoor unit; the indoor unit includes a motor, a fan component and a control board, a heat exchanger, etc., and the outdoor unit includes a DC motor, a fan component and a control board, a compressor, a condenser, a four-way valve and a throttling element, etc.

[0059] In this regard, in a low temperature environment, the temperature of the evaporation side pipe of the outdoor unit is low, and frost is easier to form, resulting in increased air flow resistance, reduced air volume, and reduced current; the thicker the frost, the greater the resistance, and the more obvious the reduction in current of the indoor unit. The current change ΔI per unit time t (min) reflects the fan blade resistance. At the same time, if there is bad weather such as rain and snow outside, it is very easy to fall on the fan blade through the grille to form frost. Therefore, the weight increase △M per unit time t reflects the thickness of the frost layer, which can accurately determine whether frost has accumulated on the outdoor unit fan blade, so as to start the fan blade protection in time, avoid damage to the fan blade, and ensure reliable operation of the fan blade.

[0060] In addition, there is a linear relationship between the unit air volume q and the current I of the DC motor system: I = Aq + B, where A and B are constants; the unit air volume q will be affected by the motor speed. When there is frost on the fan blades, the resistance increases, the air volume q decreases, and the current I also decreases. The current I of the external fan is constantly detected, and the current change per unit time t is ΔI (ΔI = I 前 -I 后 ). When the air conditioner is in heating mode, the weight of the outdoor unit is M, and the weight increase per unit time t of heating mode is △M (△M=M 后 -M 前 ).

[0061] Based on this, the defrosting control method of the outdoor fan blades in this specific implementation manner is as follows: Figure 3 As shown, the following steps are included:

[0062] Step 301, controlling the air conditioner to operate in heating mode;

[0063] Step 302, determine whether the current ambient temperature T is greater than T1, if yes, determine that the fan blades are frost-free; if no, execute step 303;

[0064] Step 303, determine whether the ambient temperature is greater than T2 and less than or equal to T1, if yes, execute step 304, if not, execute step 307;

[0065] Step 304, determining whether defrosting is completed;

[0066] Step 305, determine whether ΔM is greater than M1, and whether ΔI is greater than I1, if yes, execute step 306;

[0067] Step 306, determining that the fan blades of the outdoor unit are slightly frosted, and reducing the outdoor fan by one gear to delay frosting of the outdoor unit;

[0068] Step 307, determine whether the ambient temperature is greater than T3 and less than or equal to T2, if yes, execute step 308, if not, execute step 311;

[0069] Step 308, determining whether defrosting is completed;

[0070] Step 309, determine whether ΔM is greater than M2, and whether ΔI is greater than I2, if yes, execute step 310;

[0071] Step 310, determining that the fan blades of the outdoor unit are slightly frosted, and reducing the outdoor fan by one gear to delay frosting of the outdoor unit;

[0072] Step 311, determine whether the ambient temperature is less than T3, if yes, execute step 312;

[0073] Step 312, determine whether ΔM is greater than M3, and whether ΔI is greater than I3, if yes, execute step 313;

[0074] Step 313, determining that the fan blades of the outdoor unit are heavily frosted and that the outdoor fan is abnormally faulty, prompting manual defrosting of the fan blades.

[0075] From the above steps 301 to 313, it can be known that by detecting the current I of the outdoor fan, the change of the current I per unit time t is obtained. 前 -I 后 ; The unit is running in heating mode. When the outer ring T>T1, it is judged that there is no frost on the outdoor unit and the unit is running in heating mode normally;

[0076] When the outer ring T2<T≤T1, and the outdoor unit defrosting is completed, the outdoor unit running weight is detected at all times. When △M>M1, the current change per unit time is continued to be detected and judged. When ΔI>I1, it means that the fan blade resistance increases, and it is determined that the fan blade has a light frost layer. At this time, the outdoor fan is reduced by one gear to slow down the frosting speed to protect the fan.

[0077] When the outer ring T3<T≤T2, and the outdoor unit defrosting is completed, the outdoor unit running weight is detected at all times. When △M>M2, the current detection per unit time is continued to be judged. When ΔI>I2, it means that the fan blade resistance increases, and it is determined that the fan blade has a moderate frost layer. At this time, the outdoor fan is reduced by one gear to slow down the frosting speed to protect the fan.

[0078] When the outer loop T≤T3, the operating weight of the external unit is detected at all times. When △M>M3, the current detection per unit time continues to be judged. When ΔI>I3, it indicates that the resistance of the fan blades increases, and it is determined that there is a heavy frost layer on the fan blades. The unit reports an abnormal operation of the external fan.

[0079] Among them, △I>0; △M>0; I1<I2<I3; M1<M2<M3; T1>T2>T3>T4. In a specific example, it can be I1(0.5A)<I2(0.8A)<I3(1.5A); M1(0.2KG)<M2(0.4kg)<M3(0.6kg); T1(7℃)>T2(2℃)>T3(-8℃)>T4(-15℃).

[0080] It can be seen that in the embodiment of the present application, by adding a pressure sensor device, the weight change of the external unit per unit time is measured to determine the degree of frost on the external unit fan blades, and the frost condition of the external unit during heating operation is divided and determined under different external rings, so as to accurately control whether the external unit fan blades are operating reliably. According to the linear relationship between the current and the speed of the DC motor, when the fan blades are frosted, the fan blade resistance increases, and the frosting condition of the external unit fan blades is determined by the current change of the DC motor, thereby optimizing the time for the system to enter defrosting and the defrosting time, and achieving the purpose of reliable operation of the external unit fan blades.

[0081] Corresponding to the above Figure 1 , the present application embodiment provides a control device for an air conditioner outdoor unit, such as Figure 4 As shown, the device comprises:

[0082] The first acquisition module 402 is used to acquire a first change amount and a second change amount of the weight of the outdoor unit per unit time when the air conditioner is running in a heating mode and the ambient temperature of the outdoor unit is lower than a preset temperature; wherein the first change amount refers to the difference between the weight of the outdoor unit at the end time of the unit time and the weight of the outdoor unit at the beginning time of the unit time during the frosting process of the outdoor unit; and the second change amount refers to the difference between the current of the outdoor unit at the beginning time of the unit time and the current of the outdoor unit at the end time of the unit time during the frosting process of the outdoor unit;

[0083] The first control module 404 is used to adjust the gear position of the outdoor unit according to the first change amount and the second change amount to slow down the frosting speed.

[0084] Through the device of the embodiment of the present application, when the air conditioner is running in the heating mode, if the current air conditioner outdoor unit begins to frost, the change in the weight of the air conditioner outdoor unit per unit time is obtained in real time, and the change in the current of the corresponding air conditioner outdoor unit per unit time is obtained in real time. The gear of the air conditioner outdoor unit is adjusted based on these two changes. For example, if the current frost is increasing, the gear of the outdoor unit can be appropriately lowered to slow down the frost speed; thus, the problem of still running the outdoor unit at the current gear when the frost is increasing can be avoided, so that the outdoor unit fan blade cannot run at the current gear under the current weight, thereby damaging the fan blade. It can be seen that through the method of the embodiment of the present application, based on the real-time acquisition of the change in the weight of the outdoor unit and the change in the current, the gear of the air conditioner outdoor unit is adjusted in real time to slow down the frost speed and avoid the air conditioner outdoor unit fan blade being damaged due to the heavy weight of the frost, thereby solving the problem in the related art that when the air conditioner outdoor unit is frosted, the fan blade is hindered from rotating and damaged.

[0085] In an optional implementation manner of the embodiment of the present application, the first control module in the embodiment of the present application may further include: a control unit, used to reduce the gear of the external unit when the first change quantity represents an increase in the weight of the external unit per unit time and the second change quantity represents a decrease in the current per unit time.

[0086] In an optional implementation manner of the embodiment of the present application, the control unit in the embodiment of the present application may further include: a first control subunit, used to reduce the gear of the external unit by one level when the first change is greater than the first preset weight and the second change is greater than the first preset current; a second control subunit, used to continue to reduce the gear of the external unit by one level when the weight of the external unit continues to increase until the first change is greater than the second preset weight, and the current continues to decrease until the second change is greater than the second preset current; wherein the second preset weight is greater than the first preset weight, and the second preset current is greater than the first preset current.

[0087] In an optional implementation manner of the embodiment of the present application, the device in the embodiment of the present application may also include: a second control module, used to determine an external unit operation failure when the weight of the external unit continues to increase until the first change amount is greater than a third preset weight, and the current continues to decrease until the second change amount is greater than a third preset current; wherein the third preset weight is greater than the second preset weight, and the third preset current is greater than the second preset current.

[0088] In an optional implementation manner of the embodiment of the present application, after lowering the gear position of the outdoor unit in the embodiment of the present application, the device in the embodiment of the present application may include: a third control module, used to increase the gear position of the outdoor unit to accelerate the defrosting speed when the first change amount represents a reduction in the weight of the outdoor unit per unit time and the second change amount represents an increase in the current per unit time.

[0089] In an optional implementation manner of an embodiment of the present application, the first acquisition module in the embodiment of the present application may include: a first processing unit, used to start the defrost mode to defrost the air conditioner when the ambient temperature is higher than the second preset temperature and lower than or equal to the first preset temperature; and after the defrost is completed, the air conditioner is controlled to operate in a heating mode, and the first change in the weight of the outdoor unit per unit time and the second change in the weight of the outdoor unit per unit time are obtained; or, a second processing unit, used to start the defrost mode to defrost the air conditioner when the ambient temperature is higher than a third preset temperature and lower than or equal to the second preset temperature; and after the defrost is completed, the air conditioner is controlled to operate in a heating mode, and the first change in the weight of the outdoor unit per unit time and the second change in the weight of the outdoor unit per unit time are obtained.

[0090] In an optional implementation manner of the embodiment of the present application, the device in the embodiment of the present application also includes: a second acquisition module, which is used to directly obtain the first change amount and the second change amount of the weight of the external unit per unit time when the ambient temperature is lower than the third preset temperature.

[0091] like Figure 5 As shown, the embodiment of the present application provides a control device for an air conditioner, including a processor 511, a communication interface 512, a memory 513 and a communication bus 514, wherein the processor 511, the communication interface 512, and the memory 513 communicate with each other through the communication bus 514.

[0092] Memory 513, used for storing computer programs;

[0093] In one embodiment of the present application, the processor 511 is used to execute the program stored in the memory 513 to implement the control method of the air conditioner outdoor unit provided by any of the aforementioned method embodiments, and the role it plays is similar and will not be repeated here.

[0094] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method for controlling an outdoor unit of an air conditioner as provided in any of the aforementioned method embodiments are implemented.

[0095] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0096] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0097] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0098] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for controlling an outdoor unit of an air conditioner, characterized in that: include: When the air conditioner is operated in heating mode and the ambient temperature of the outdoor unit is lower than a preset temperature, a first change amount and a second change amount of the weight of the outdoor unit within a unit time are obtained; wherein the first change amount refers to the difference between the weight of the outdoor unit at the end of the unit time and the weight of the outdoor unit at the start of the unit time during the frosting process of the outdoor unit; and the second change amount refers to the difference between the current of the outdoor unit at the start of the unit time and the current of the outdoor unit at the end of the unit time during the frosting process of the outdoor unit; The gear position of the outdoor unit is adjusted according to the first change amount and the second change amount to slow down the frosting speed.

2. The method according to claim 1, characterized in that Adjusting the gear position of the external unit according to the first change amount and the second change amount includes: When the first change amount represents an increase in the weight of the external unit per unit time, and the second change amount represents a decrease in the current per unit time, the gear position of the external unit is reduced.

3. The method according to claim 2, characterized in that When the first change amount represents an increase in the weight of the external unit per unit time, and the second change amount represents a decrease in the current per unit time, lowering the gear position of the external unit includes: When the first change amount is greater than a first preset weight and the second change amount is greater than a first preset current, lowering the gear position of the external machine by one gear; When the weight of the external unit continues to increase until the first change amount is greater than a second preset weight, and the current continues to decrease until the second change amount is greater than a second preset current, continue to reduce the gear of the external unit by one gear; Wherein, the second preset weight is greater than the first preset weight, and the second preset current is greater than the first preset current.

4. The method according to claim 3, characterized in that The method further comprises: When the weight of the external unit continues to increase until the first change amount is greater than a third preset weight, and the current continues to decrease until the second change amount is greater than a third preset current, determining that the external unit has an operation failure; Among them, the third preset weight is greater than the second preset weight, and the third preset current is greater than the second preset current.

5. The method according to claim 2, characterized in that: After lowering the gear position of the external machine, the method includes: When the first change amount represents a decrease in the weight of the outdoor unit per unit time, and the second change amount represents an increase in the current per unit time, the gear position of the outdoor unit is increased to accelerate the defrosting speed.

6. The method according to claim 1, characterized in that When the air conditioner is operated in a heating mode and the ambient temperature of the outdoor unit is lower than a preset temperature, obtaining a first change amount and a second change amount of the weight of the outdoor unit per unit time includes: When the ambient temperature is higher than the second preset temperature and lower than or equal to the first preset temperature, starting the defrost mode to defrost the air conditioner; and when the air conditioner is controlled to operate in the heating mode after the defrost is completed, obtaining the first change amount and the second change amount of the outdoor unit weight per unit time; or, When the ambient temperature is higher than the third preset temperature and lower than or equal to the second preset temperature, the defrost mode is started to defrost the air conditioner; and when the air conditioner is controlled to operate in the heating mode after the defrost is completed, the first change in the weight of the outdoor unit per unit time and the second change in the weight of the outdoor unit per unit time are obtained.

7. The method according to claim 6, characterized in that The method further comprises: When the ambient temperature is lower than the third preset temperature, the first change amount and the second change amount of the weight of the external unit per unit time are directly acquired.

8. A control device for an air conditioner outdoor unit, characterized in that: include: A first acquisition module is used to acquire a first change amount and a second change amount of the weight of the outdoor unit per unit time when the air conditioner is running in a heating mode and the ambient temperature of the outdoor unit is lower than a preset temperature; wherein the first change amount refers to the difference between the weight of the outdoor unit at the end time of the unit time and the weight of the outdoor unit at the start time of the unit time during the frosting process of the outdoor unit; and the second change amount refers to the difference between the current of the outdoor unit at the start time of the unit time and the current of the outdoor unit at the end time of the unit time during the frosting process of the outdoor unit; The first control module is used to adjust the gear position of the outdoor unit according to the first change amount and the second change amount to slow down the frosting speed.

9. An air conditioner, comprising a control device, wherein the control device comprises: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor coupled to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to execute the control method of the air conditioner outdoor unit according to any one of claims 1 to 7.

10. A computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the control method of the air conditioner outdoor unit according to any one of claims 1 to 7.

Images