Air conditioner defrosting control method and device, air conditioner, storage medium and program product

Abstract

The invention discloses an air conditioner defrosting control method and device, an air conditioner, a storage medium and a computer program product, and the method comprises the steps that when the air conditioner operates in a heating mode, whether defrosting is started or not is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature and the operation duration of the air conditioner in each heating mode after the air conditioner is started at this time; if it is determined that defrosting is started, the air conditioner is switched to a refrigeration mode, and the defrosting duration of this time is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature and the operation duration; and after defrosting reaches the time length of this time of defrosting, defrosting is ended, and the air conditioner is switched to a heating mode. According to the scheme, whether defrosting is conducted or not is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature and the operation duration of the air conditioner in the heating mode, the defrosting duration is controlled, accurate detection of the defrosting time is achieved, incomplete defrosting or excessive defrosting is avoided, and the operation efficiency of the air conditioner is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and specifically relates to a control method and device for air conditioner defrosting, an air conditioner, a storage medium and a computer program product. Background Art

[0002] When the air source heat pump unit is heating in winter, when the evaporation temperature is lower than the air dew point temperature, the outdoor heat exchanger is prone to frost, which reduces the performance of the heat exchanger and the energy efficiency of the heat pump system. The relevant solution controls the reversal of the four-way valve by detecting the outdoor ambient temperature and the pipe temperature of the outdoor heat exchanger, and switches to the cooling mode to melt the frost layer on the outdoor heat exchanger. However, in the face of extremely severe weather such as rapid changes in ambient temperature, this defrosting logic is slow to respond, and the defrosting time may be too long or too short. If the defrosting time is too long, the heating capacity of the air-conditioning system will be significantly reduced, reducing the user experience; if the defrosting time is too short, the defrosting will not be thorough, which will seriously reduce the heat exchange efficiency of the outdoor heat exchanger and affect the comfort of the indoor environment.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The object of the present invention is to provide a control method, device, air conditioner, storage medium and computer program product for air conditioner defrosting, so as to solve the problem that the defrosting time of the air conditioner cannot be accurately controlled in related schemes, resulting in excessive defrosting or incomplete defrosting, affecting indoor comfort and reducing user experience. The present invention can achieve the effect of accurately detecting the defrosting timing by determining whether to defrost according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature and the operating time of the air conditioner in the heating mode, and controlling the defrost time, thereby avoiding incomplete defrosting or excessive defrosting and improving the operating efficiency of the air conditioner.

[0005] The present invention provides a control method for defrosting an air conditioner, comprising: when the air conditioner is running in a heating mode, obtaining a tube temperature of an outdoor heat exchanger of the air conditioner, an outdoor dew point temperature, and an operating time of the air conditioner in each heating mode after being turned on this time; determining whether to start defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time; if it is determined to start defrosting, controlling the air conditioner to switch to a cooling mode, and determining a defrosting time according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time; ending defrosting after the defrosting time reaches the defrosting time, and controlling the air conditioner to switch to a heating mode.

[0006] In some embodiments, after determining to start defrosting, if it is determined that this defrost is the first defrost after the air conditioner is turned on, the defrost is terminated after the tube temperature of the outdoor heat exchanger reaches a preset tube temperature and lasts for a preset time; if it is determined that this defrost is not the first defrost after the air conditioner is turned on, the duration of this defrost is determined based on the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time.

[0007] In some embodiments, whether to defrost is to be performed is determined based on the tube temperature of the outdoor heat exchanger, the outdoor dew-point temperature, and the operating time, including: determining whether the operating time in the current heating mode reaches a preset time; if the operating time in the current heating mode reaches a preset time, determining whether the tube temperature of the outdoor heat exchanger is lower than a preset temperature; if the tube temperature of the outdoor heat exchanger is lower than the preset temperature, determining the difference between the outdoor dew-point temperature and the tube temperature of the outdoor heat exchanger; if the difference between the outdoor dew-point temperature and the tube temperature of the outdoor heat exchanger is greater than or equal to the preset temperature difference, determining to defrost.

[0008] In some embodiments, the duration of this defrosting is determined according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time, including: determining a first parameter according to the size relationship between the outdoor dew point temperature and the preset outdoor dew point temperature; determining a second parameter according to the size relationship between the operating time in the first two heating modes after the air conditioner is turned on this time; determining a third parameter according to the size relationship between the tube temperatures of the outdoor heat exchanger after the first two defrostings; the first parameter, the second parameter, and the third parameter all include: -1, 0, 1; judging the first parameter, the second parameter, and the third parameter the size of the sum of the first parameter, the second parameter and the third parameter; if the sum of the first parameter, the second parameter and the third parameter is greater than 0, then the preset running time adjustment amount is increased on the basis of the defrost running time of the previous defrost, and the result is used as the duration of this defrost; if the sum of the first parameter, the second parameter and the third parameter is equal to 0, then the defrost running time of the previous defrost is used as the duration of this defrost; if the sum of the first parameter, the second parameter and the third parameter is less than 0, then the preset running time adjustment amount is reduced on the basis of the defrost running time of the previous defrost, and the result is used as the duration of this defrost.

[0009] In some embodiments, the first parameter is determined according to the relationship between the outdoor dew point temperature and the preset outdoor dew point temperature, including: if the outdoor dew point temperature is equal to the preset outdoor dew point temperature, the first parameter is 0; if the outdoor dew point temperature is greater than the preset outdoor dew point temperature, the first parameter is -1; if the outdoor dew point temperature is less than the preset outdoor dew point temperature, the first parameter is 1; and / or, according to the relationship between the operating time in the first two heating modes after the air conditioner is turned on this time, including: if the operating time in the previous heating mode is equal to the operating time in the previous heating mode, the second parameter is 0; if the operating time in the previous heating mode is less than the operating time in the previous heating mode, then The second parameter is -1; if the operating time in the last heating mode is greater than the operating time in the previous heating mode, the second parameter is 1; and / or, the third parameter is determined according to the relationship between the tube temperatures of the outdoor heat exchanger after the first two defrosts, including: if the tube temperature of the outdoor heat exchanger after the last defrost is equal to the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is 0; if the tube temperature of the outdoor heat exchanger after the last defrost is less than the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is -1; if the tube temperature of the outdoor heat exchanger after the last defrost is greater than the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is 1.

[0010] In some embodiments, after determining the duration of this defrost, it is determined whether the duration of this defrost is greater than the preset maximum frost time or less than the preset minimum frost time; if the duration of this defrost is greater than the preset maximum frost time, the preset maximum frost time will be used as the duration of this defrost; if the duration of this defrost is less than the preset minimum frost time, the preset minimum frost time will be used as the duration of this defrost.

[0011] Matching the above method, the present invention provides a control device for air conditioner defrosting, comprising: an acquisition unit, configured to acquire the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time of the air conditioner in each heating mode after being turned on this time, during the process of the air conditioner running in the heating mode; a control unit, configured to determine whether to start defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time; the control unit is further configured to control the air conditioner to switch to the cooling mode if it is determined to start defrosting, and determine the duration of this defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time; the control unit is further configured to end defrosting after the defrosting reaches the duration of this defrosting, and control the air conditioner to switch to the heating mode.

[0012] In some embodiments, after determining to start defrosting, if the control unit determines that this defrost is the first defrost after the air conditioner is turned on, the defrost will be terminated after the tube temperature of the outdoor heat exchanger reaches a preset tube temperature and lasts for a preset time; if it is determined that this defrost is not the first defrost after the air conditioner is turned on, the duration of the defrost is determined based on the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time.

[0013] In some embodiments, the control unit determines whether to perform defrosting based on the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time, including: determining whether the operating time in the current heating mode reaches a preset time; if the operating time in the current heating mode reaches a preset time, determining whether the tube temperature of the outdoor heat exchanger is lower than a preset temperature; if the tube temperature of the outdoor heat exchanger is lower than the preset temperature, determining the difference between the outdoor dew point temperature and the tube temperature of the outdoor heat exchanger; if the difference between the outdoor dew point temperature and the tube temperature of the outdoor heat exchanger is greater than or equal to the preset temperature difference, determining to perform defrosting.

[0014] In some embodiments, the control unit determines the duration of this defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time, including: determining a first parameter according to the relationship between the outdoor dew point temperature and a preset outdoor dew point temperature; determining a second parameter according to the relationship between the operating time in the first two heating modes after the air conditioner is turned on this time; determining a third parameter according to the relationship between the tube temperatures of the outdoor heat exchanger after the first two defrostings; the first parameter, the second parameter, and the third parameter all include: -1, 0, 1; judging the first parameter, the second parameter, and the third parameter the sum of the first parameter, the second parameter and the third parameter; if the sum of the first parameter, the second parameter and the third parameter is greater than 0, then the preset running time adjustment amount is added to the defrost running time of the previous defrost, and the result is used as the duration of this defrost; if the sum of the first parameter, the second parameter and the third parameter is equal to 0, then the defrost running time of the previous defrost is used as the duration of this defrost; if the sum of the first parameter, the second parameter and the third parameter is less than 0, then the preset running time adjustment amount is reduced based on the defrost running time of the previous defrost, and the result is used as the duration of this defrost.

[0015] In some embodiments, the control unit determines a first parameter based on the relationship between the outdoor dew point temperature and the preset outdoor dew point temperature, including: if the outdoor dew point temperature is equal to the preset outdoor dew point temperature, the first parameter is 0; if the outdoor dew point temperature is greater than the preset outdoor dew point temperature, the first parameter is -1; if the outdoor dew point temperature is less than the preset outdoor dew point temperature, the first parameter is 1; and / or, based on the relationship between the operating time in the first two heating modes after the air conditioner is turned on this time, including: if the operating time in the last heating mode is equal to the operating time in the previous heating mode, the second parameter is 0; if the operating time in the last heating mode is less than the operating time in the previous heating mode duration, the second parameter is -1; if the operating time in the previous heating mode is greater than the operating time in the previous heating mode, the second parameter is 1; and / or, the third parameter is determined according to the relationship between the tube temperatures of the outdoor heat exchanger after the previous two defrosts, including: if the tube temperature of the outdoor heat exchanger after the previous defrost is equal to the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is 0; if the tube temperature of the outdoor heat exchanger after the previous defrost is less than the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is -1; if the tube temperature of the outdoor heat exchanger after the previous defrost is greater than the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is 1.

[0016] In some embodiments, the control unit, after determining the duration of this defrost, determines whether the duration of this defrost is greater than the preset maximum frost time or less than the preset minimum frost time; if the duration of this defrost is greater than the preset maximum frost time, the preset maximum frost time will be used as the duration of this defrost; if the duration of this defrost is less than the preset minimum frost time, the preset minimum frost time will be used as the duration of this defrost.

[0017] Matching the above device, the present invention provides an air conditioner on another aspect, including: the air conditioner defrosting control device mentioned above.

[0018] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air conditioning defrosting control method.

[0019] In accordance with the above method, the present invention provides a computer program product on another aspect, wherein the computer program product includes a computer program, and when the computer program product is processed and executed, the steps of the above air conditioner defrosting control method are implemented.

[0020] The scheme of the present invention determines whether to start defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode after the air conditioner is turned on this time when the air conditioner is in heating operation; if it is determined to start defrosting, the air conditioner is controlled to switch to the cooling mode, and the duration of this defrosting is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time; after the defrosting reaches the defrosting time, the defrosting is terminated and the air conditioner is switched to the heating mode. By determining whether to perform defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode, and controlling the defrosting time, accurate detection of defrosting is achieved, incomplete defrosting or excessive defrosting is avoided, and the operating efficiency of the air conditioner is improved.

[0021] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic flow chart of an embodiment of a method for controlling air conditioner defrosting according to the present invention;

[0024] Figure 2 It is a structural schematic diagram of an embodiment of the air conditioner defrosting control device of the present invention;

[0025] Figure 3 A schematic diagram of the system structure of the air conditioner of the present invention;

[0026] Figure 4 A schematic diagram of a process for determining that an air conditioner performs defrosting in a control method of the present invention;

[0027] Figure 5 The present invention is a flow chart of determining the defrosting time of an air conditioner in the control method of the present invention.

[0028] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0029] 1- compressor; 2- four-way valve; 3- outer ring temperature sensing package; 4- indoor heat exchanger; 5- outdoor heat exchanger surface temperature sensing package; 6- electronic expansion valve; 7- outdoor heat exchanger; 8- oil separator; 102- acquisition unit; 104- control unit. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] According to an embodiment of the present invention, a control method for defrosting an air conditioner is provided. The air conditioner has a four-way valve. By controlling the switching of the four-way valve, the air conditioner can be operated in a heating mode or a cooling mode. Figure 3 In the air conditioning system structure shown in the figure, in the heating mode, after the refrigerant is discharged from the compressor 1, it passes through the four-way valve 2, the indoor heat exchanger 4, the electronic expansion valve 6, the outdoor heat exchanger 7, the four-way valve 2, the oil separator 8 in sequence, and then returns to the compressor 1. In the cooling mode, after the refrigerant is discharged from the compressor 1, it passes through the four-way valve 2, the outdoor heat exchanger 7, the electronic expansion valve 6, the indoor heat exchanger 4, the four-way valve 2, the oil separator 8 in sequence, and then returns to the compressor 1. Among them, the indoor heat exchanger 4 is a shell and tube heat exchanger, and the outdoor heat exchanger 7 is a fin heat exchanger. Figure 1 The flowchart of an embodiment of the method of the present invention is shown in FIG. The air conditioner defrosting control method may include: steps S110 to S140.

[0032] In step S110, during the operation of the air conditioner in the heating mode, the pipe temperature of the outdoor heat exchanger of the air conditioner, the outdoor dew point temperature, and the operation time of the air conditioner in each heating mode after being turned on are obtained.

[0033] The pipe temperature of the outdoor heat exchanger is detected by the temperature sensing package 5 set at the farthest copper pipe of the outdoor heat exchanger. After the outdoor dry bulb temperature and outdoor wet bulb temperature detected by the outer ring temperature sensing package 3 are input into the enthalpy-humidity diagram database, the outdoor dew point temperature can be obtained.

[0034] In step S120, it is determined whether to start defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time.

[0035] In some embodiments, in step S120, the specific process of determining whether to start defrosting is based on the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time, including: determining whether the operating time in the current heating mode has reached a preset time; wherein the operating time is reset after each defrosting; if the operating time in the current heating mode has reached a preset time, determining whether the tube temperature of the outdoor heat exchanger is lower than a preset temperature; if the tube temperature of the outdoor heat exchanger is lower than the preset temperature, determining the difference between the outdoor dew point temperature and the tube temperature of the outdoor heat exchanger; if the difference between the outdoor dew point temperature and the tube temperature of the outdoor heat exchanger is greater than or equal to the preset temperature difference, determining to perform defrosting.

[0036] Figure 4 FIG. 1 is a flow chart of determining whether the air conditioner is defrosting in the control method of the present invention. Figure 4 As shown, the method includes:

[0037] Step 1: During the heating operation of the air conditioner, obtain the heating operation time s of the unit from the end of the last defrost to the current time, and determine whether s>30min. If s>30min, execute step 2; if s≤30min, execute step 1 again.

[0038] Step 2, obtain the surface temperature T of the outdoor heat exchanger and determine whether T<0°C. If T<0°C, execute step 3; if T≥0°C, execute step 2 again.

[0039] Step 3, obtain the outdoor dry bulb and wet bulb temperatures, input them into the pre-stored enthalpy-humidity diagram database, obtain the outdoor dew point temperature t, and determine whether t-set dew point temperature T≥b. b is the preset difference. If tT≥b, the air conditioner starts defrosting, and if tT<b, execute step 2.

[0040] By determining whether the air conditioner needs to be defrosted based on the outdoor heat exchanger tube temperature, dew point temperature, and operating time, the accuracy of defrosting judgment is improved. This avoids system instability caused by frequent or unnecessary defrosting of the air conditioner and improves system reliability.

[0041] In step S130, if it is determined to start defrosting, the air conditioner is controlled to switch to the cooling mode, and the duration of this defrosting is determined according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time.

[0042] In some embodiments, after determining to start defrosting, if it is determined that this is the first defrost after the air conditioner is turned on, the defrost is terminated after the tube temperature of the outdoor heat exchanger reaches a preset tube temperature and lasts for a preset time; if it is determined that this defrost is not the first defrost after the air conditioner is turned on, the duration of the defrost is determined based on the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time.

[0043] During the first defrost after the air conditioner is turned on, the first defrost is determined based on the pipe temperature of the outdoor heat exchanger. The defrost duration of the first defrost and the outdoor heat exchanger pipe temperature after the defrost are stored for subsequent adjustment of the defrost duration. The preset pipe temperature can be set to 15°C, and the preset time can be set to 1min. During the first defrost, when the pipe temperature of the outdoor heat exchanger reaches 15°C and lasts for at least 1min, the defrost is considered to be completed and the air conditioner exits the defrost.

[0044] In some embodiments, in step S130, the specific process of determining the duration of this defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time includes: steps S210 to S250.

[0045] Step S210, determining a first parameter according to the relationship between the outdoor dew-point temperature and the preset outdoor dew-point temperature; determining a second parameter according to the relationship between the operating time of the air conditioner in the first two heating modes after being turned on this time; determining a third parameter according to the relationship between the tube temperatures of the outdoor heat exchanger after the first two defrosting operations; the first parameter, the second parameter, and the third parameter all include: -1, 0, 1.

[0046] The first parameter, the second parameter, and the third parameter are identifiers of logical judgment. In order to judge whether the outdoor dew point temperature, the operating time, and the outdoor heat exchanger tube temperature have reached their respective preset conditions, -1, 0, and 1 correspond to different judgment results, and different judgment results correspond to different defrost time adjustment tendencies. A parameter of -1 indicates that the defrost time needs to be increased, a parameter of 1 indicates that the defrost time needs to be reduced, and a parameter of 0 means that the defrost time remains unchanged. Taking the first parameter as an example, when the first parameter is -1, it means that the defrost time needs to be increased according to the judgment result of the outdoor dew point temperature, when the first parameter is 0, the defrost time remains unchanged, and when the first parameter is 1, the defrost time needs to be reduced. Afterwards, by considering the permutation and combination relationship among the sum of the three parameters according to the size, the misjudgment of defrosting can be prevented, and there are corresponding defrost time adjustment methods in different situations, thereby improving the accuracy of control.

[0047] In some embodiments, in step S210, the specific process of determining the first parameter based on the relationship between the outdoor dew point temperature and the preset outdoor dew point temperature includes: if the outdoor dew point temperature is equal to the preset outdoor dew point temperature, the first parameter is 0; if the outdoor dew point temperature is greater than the preset outdoor dew point temperature, the first parameter is -1; if the outdoor dew point temperature is less than the preset outdoor dew point temperature, the first parameter is 1.

[0048] The preset outdoor dew point temperature t0 is a temperature value predicted according to the weather and temperature conditions, which is used to determine whether the outdoor dew point temperature t1 is reduced or increased, and then determine whether the frosting of the outdoor unit is aggravated. Specifically, when t0<t1, it means that the outdoor dew point temperature will decrease. At this time, the water vapor in the air is more likely to reach saturation and condense. When the surface temperature of the outdoor heat exchanger is the same, the outdoor unit is more likely to frost and the frosting situation is aggravated. Therefore, the first parameter is -1, which means that the defrosting time is increased. When t0>t1, it means that the outdoor dew point temperature will increase, and the frosting of the outdoor unit will be relatively weakened. Therefore, the first parameter is 1, which means that the defrosting time is shortened. When t0=t1, it means that the outdoor dew point temperature has not changed. At this time, the first parameter is 0, which means that the defrosting time remains unchanged.

[0049] In some embodiments, in step S210, the specific process according to the size relationship between the operating time in the previous two heating modes after the air conditioner is turned on this time includes: if the operating time in the previous heating mode is equal to the operating time in the previous heating mode, the second parameter is 0; if the operating time in the previous heating mode is less than the operating time in the previous heating mode, the second parameter is -1; if the operating time in the previous heating mode is greater than the operating time in the previous heating mode, the second parameter is 1.

[0050] When the air conditioner is heating, it cycles continuously between the heating mode and the defrosting mode, and the running time in each heating mode is counted separately. For example, when the air conditioner starts to defrost, the running time of the unit between the end of the last defrosting and the start of the current defrosting is taken as the running time of the air conditioner in the last heating mode. Since the air conditioner cycles under heating-defrosting, the faster and more serious the frost on the outdoor unit, the more frequently the air conditioner defrosts, and the defrosting time will also increase, resulting in a gradual decrease in the running time in the heating mode. Therefore, it can be judged whether the frosting of the air conditioner is getting more and more serious based on the size relationship between the running time s1 in the last heating mode and the running time s2 in the last heating mode. Specifically, when s1<s2, it means that the running time of the air conditioner in the heating mode is gradually decreasing, and the frosting of the outdoor unit is serious, so the second parameter is -1, that is, the defrosting time is increased. When s1>s2, it means that the running time in the heating mode has increased, and the frosting of the outdoor unit has been alleviated, so the second parameter is 1, that is, the defrosting time is reduced. When s1=s2, it means that the frosting condition has not changed, the second parameter is 0, and the defrosting time remains unchanged.

[0051] In some embodiments, in step S210, the specific process of determining the third parameter according to the relationship between the tube temperatures of the outdoor heat exchanger after the first two defrosts includes: if the tube temperature of the outdoor heat exchanger after the last defrost is equal to the tube temperature of the outdoor heat exchanger after the last defrost, the third parameter is 0; if the tube temperature of the outdoor heat exchanger after the last defrost is less than the tube temperature of the outdoor heat exchanger after the last defrost, the third parameter is -1; if the tube temperature of the outdoor heat exchanger after the last defrost is greater than the tube temperature of the outdoor heat exchanger after the last defrost, the third parameter is 1.

[0052] The air conditioner will stop defrosting after the set defrosting time is reached. If the outdoor environment is bad, the defrosting effect will be worse, and the tube temperature of the outdoor heat exchanger will be lower when the defrosting is finished, that is, the frosting of the outdoor unit will be aggravated. Therefore, the frosting condition of the outdoor unit can be judged according to the outdoor heat exchanger tube temperature T1 after the last defrosting and the outdoor heat exchanger tube temperature T2 after the previous defrosting. Specifically, when T1<T2, it means that the tube temperature of the outdoor heat exchanger drops after defrosting, and the frosting condition of the outdoor unit is aggravated, so the third parameter is -1, that is, the defrosting time is increased. When T1>T2, it means that the tube temperature of the outdoor heat exchanger rises after defrosting, and the frosting condition of the outdoor unit is weakened, so the third parameter is 1, that is, the defrosting time is reduced. When T1=T2, it means that the frosting condition has not changed, the third parameter is 0, and the defrosting time remains unchanged.

[0053] Step S220, determining the size of the sum of the first parameter, the second parameter, and the third parameter.

[0054] Step S230: if the sum of the first parameter, the second parameter and the third parameter is greater than 0, then the preset operation time adjustment amount is increased on the basis of the defrost operation time of the previous defrost, and the result is used as the duration of this defrost.

[0055] Step S240: if the sum of the first parameter, the second parameter and the third parameter is equal to 0, the defrost operation duration of the last defrost is used as the duration of this defrost.

[0056] Step S250, if the sum of the first parameter, the second parameter and the third parameter is less than 0, then the preset operation time adjustment amount is reduced based on the defrost operation time of the previous defrost, and the result is used as the duration of this defrost.

[0057] Inaccurate parameter detection may occur during the operation of the air conditioner, which may lead to misjudgment of defrosting. This solution determines the adjustment strategy of the defrosting time according to the outdoor dew point temperature, the operating time in the heating mode, and the changes in the outdoor heat exchanger tube temperature to prevent misjudgment of defrosting and improve the accuracy of control. At the same time, it avoids incomplete defrosting or excessive defrosting, thereby improving the operating efficiency of the air conditioner.

[0058] In some embodiments, the control method also includes: after determining the duration of this defrost, judging whether the duration of this defrost is greater than the preset maximum frost duration or less than the preset minimum frost duration; if the duration of this defrost is greater than the preset maximum frost duration, the preset maximum frost duration is used as the duration of this defrost; if the duration of this defrost is less than the preset minimum frost time, the preset minimum frost time is used as the duration of this defrost.

[0059] In order to ensure the operating efficiency of the air conditioner and avoid the situation where the defrosting time is too long and affects the indoor comfort and the defrosting time is too short and causes incomplete defrosting, the system sets the maximum defrosting time and the minimum defrosting time to limit the defrosting process. After determining the defrosting time, if the defrosting time exceeds the maximum defrosting time or is less than the minimum defrosting time, the defrosting time will be adjusted and the maximum defrosting time or the minimum defrosting time will be used as the defrosting time. max It is twice the defrost time of the air conditioner for the first defrost x1, that is, X max =2*x1. Minimize frost duration X min It is half of the defrosting time x1 of the first defrosting of the air conditioner, that is, X min =0.5*x1.

[0060] In step S140, the defrosting is terminated after the defrosting time reaches the duration of the current defrosting, and the air conditioner is controlled to switch to the heating mode.

[0061] Figure 5 FIG. 1 is a flow chart of determining the defrosting time of an air conditioner in the control method of the present invention. Figure 5 As shown, the method includes:

[0062] Step 11, after the air conditioner starts defrosting, determine whether this is the first defrosting after the air conditioner is powered on. If this is the first defrosting, enter the defrosting, and end the defrosting after the surface temperature of the outdoor heat exchanger T≥15℃ and lasts for 1min, and store the duration of this defrosting. If this is not the first defrosting, obtain the outdoor dew point temperature ti, the preset outdoor dew point temperature ti+1, the operating time si-1 in the last heating mode, the operating time si-2 in the last heating mode, the surface temperature Ti-1 of the outdoor heat exchanger after the last defrosting, and the surface temperature Ti-2 of the outdoor heat exchanger after the last defrosting, and then execute steps 12, 13, and 14 respectively.

[0063] Step 12, determine the value of δ1 according to the magnitude relationship between ti and ti+1. If ti+1=ti, then δ1=0; if ti+1>ti, then δ1=1; if ti+1<ti, then δ1=-1. Then execute step 15.

[0064] Step 13, determine the value of δ2 according to the magnitude relationship between si-1 and si-2. If si-1=si-2 or there is no si-2, then δ2=0; if si-1>si-2, then δ2=1; if si-1<si-2, then δ2=-1. Then execute step 15.

[0065] Step 14, determine the value of δ3 according to the magnitude relationship between Ti-1 and Ti-2. If Ti-1 = Ti-2 or there is no Ti-2, then δ3 = 0; if Ti-1 > Ti-2, then δ3 = 1; if Ti-1 < Ti-2, then δ3 = -1. Then execute step 15.

[0066] Step 15, δ=δ1+δ2+δ3. When δ>0, the defrosting time of this defrosting is xi=x i-1 +0.1x1,x i-1 is the defrost time of the last defrost, x1 is the defrost time of the first defrost, if x i >2x1 then x i =2x1. When δ=0, x i =x i-1 When δ<0, xi=x i-1 -0.1x1, if x i <0.5x1 then x i =0.5x1. Then when the defrost time reaches x i Then end the defrosting.

[0067] By adopting the technical solution of this embodiment, when the air conditioner is in heating operation, it is determined whether to start defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode after this startup; if it is determined to start defrosting, the air conditioner is controlled to switch to the cooling mode, and the duration of this defrosting is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time; after the defrosting reaches the defrosting time, the defrosting ends and the air conditioner switches to the heating mode. By determining whether to defrost according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode, and controlling the defrosting time, accurate defrosting detection is achieved, incomplete defrosting or excessive defrosting is avoided, and the operating efficiency of the air conditioner is improved.

[0068] According to an embodiment of the present invention, a control device for air conditioner defrosting corresponding to the control method for air conditioner defrosting is also provided. The air conditioner has a four-way valve, and the air conditioner can be operated in heating mode or cooling mode by controlling the switching of the four-way valve. Figure 3 In the air conditioning system structure shown, in the heating mode, after the refrigerant is discharged from the compressor 1, it passes through the four-way valve 2, the indoor heat exchanger 4, the electronic expansion valve 6, the outdoor heat exchanger 7, the four-way valve 2, and the oil separator 8 in sequence, and then returns to the compressor 1. In the cooling mode, after the refrigerant is discharged from the compressor 1, it passes through the four-way valve 2, the outdoor heat exchanger 7, the electronic expansion valve 6, the indoor heat exchanger 4, the four-way valve 2, and the oil separator 8 in sequence, and then returns to the compressor 1. Among them, the indoor heat exchanger 4 is a shell and tube heat exchanger, and the outdoor heat exchanger 7 is a fin heat exchanger. Figure 2 The structure diagram of an embodiment of the device of the present invention is shown. The air conditioner defrosting control device may include: an acquisition unit 102 and a control unit 104.

[0069] The acquisition unit 102 is configured to acquire the pipe temperature of the outdoor heat exchanger of the air conditioner, the outdoor dew point temperature, and the operation time of the air conditioner in each heating mode after the air conditioner is turned on. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0070] The pipe temperature of the outdoor heat exchanger is detected by the temperature sensing package 5 set at the farthest copper pipe of the outdoor heat exchanger. After the outdoor dry bulb temperature and outdoor wet bulb temperature detected by the outer ring temperature sensing package 3 are input into the enthalpy-humidity diagram database, the outdoor dew point temperature can be obtained.

[0071] The control unit 104 is configured to determine whether to start defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operation time. The specific functions and processing of the control unit 104 refer to step S120.

[0072] In some embodiments, the control unit 104 determines whether to start defrosting based on the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time, including: determining whether the operating time in the current heating mode has reached a preset time; wherein the operating time is reset after each defrosting; if the operating time in the current heating mode has reached a preset time, determining whether the tube temperature of the outdoor heat exchanger is lower than a preset temperature; if the tube temperature of the outdoor heat exchanger is lower than the preset temperature, determining the difference between the outdoor dew point temperature and the tube temperature of the outdoor heat exchanger; if the difference between the outdoor dew point temperature and the tube temperature of the outdoor heat exchanger is greater than or equal to the preset temperature difference, determining to perform defrosting.

[0073] Figure 4 FIG. 1 is a flow chart of determining whether the air conditioner is defrosting in the control method of the present invention. Figure 4 As shown, the method includes:

[0074] Step 1: During the heating operation of the air conditioner, obtain the heating operation time s of the unit from the end of the last defrost to the current time, and determine whether s>30min. If s>30min, execute step 2; if s≤30min, execute step 1 again.

[0075] Step 2, obtain the surface temperature T of the outdoor heat exchanger and determine whether T<0°C. If T<0°C, execute step 3; if T≥0°C, execute step 2 again.

[0076] Step 3, obtain the outdoor dry bulb and wet bulb temperatures, input them into the pre-stored enthalpy-humidity diagram database, obtain the outdoor dew point temperature t, and determine whether t-set dew point temperature T≥b. b is the preset difference. If tT≥b, the air conditioner starts defrosting, and if tT<b, execute step 2.

[0077] By determining whether the air conditioner needs to be defrosted based on the outdoor heat exchanger tube temperature, dew point temperature, and operating time, the accuracy of defrosting judgment is improved. This avoids system instability caused by frequent or unnecessary defrosting of the air conditioner and improves system reliability.

[0078] The control unit 104 is further configured to control the air conditioner to switch to the cooling mode if it is determined to start defrosting, and determine the duration of this defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time. The specific functions and processing of the control unit 104 refer to step S130.

[0079] In some embodiments, the control unit 104 is further configured to, after determining to start defrosting, if it is determined that this is the first defrosting after the air conditioner is turned on, end the defrosting after the tube temperature of the outdoor heat exchanger reaches a preset tube temperature and lasts for a preset time; if it is determined that this defrosting is not the first defrosting after the air conditioner is turned on, determine the duration of the defrosting based on the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time.

[0080] During the first defrost after the air conditioner is turned on, the first defrost is determined based on the pipe temperature of the outdoor heat exchanger. The defrost duration of the first defrost and the outdoor heat exchanger pipe temperature after the defrost are stored for subsequent adjustment of the defrost duration. The preset pipe temperature can be set to 15°C, and the preset time can be set to 1min. During the first defrost, when the pipe temperature of the outdoor heat exchanger reaches 15°C and lasts for at least 1min, the defrost is considered to be completed and the air conditioner exits the defrost.

[0081] In some embodiments, the control unit 104 determines the duration of this defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time, including:

[0082] The control unit 104 is further configured to determine a first parameter according to the size relationship between the outdoor dew point temperature and the preset outdoor dew point temperature; determine a second parameter according to the size relationship between the operating time of the air conditioner in the previous two heating modes after the air conditioner is turned on this time; determine a third parameter according to the size relationship between the pipe temperatures of the outdoor heat exchanger after the previous two defrosting ends; the first parameter, the second parameter, and the third parameter all include: -1, 0, 1. The specific functions and processing of the control unit 104 refer to step S210.

[0083] The first parameter, the second parameter, and the third parameter are identifiers of logical judgment. In order to judge whether the outdoor dew point temperature, the operating time, and the outdoor heat exchanger tube temperature have reached their respective preset conditions, -1, 0, and 1 correspond to different judgment results, and different judgment results correspond to different defrost time adjustment tendencies. A parameter of -1 indicates that the defrost time needs to be increased, a parameter of 1 indicates that the defrost time needs to be reduced, and a parameter of 0 means that the defrost time remains unchanged. Taking the first parameter as an example, when the first parameter is -1, it means that the defrost time needs to be increased according to the judgment result of the outdoor dew point temperature, when the first parameter is 0, the defrost time remains unchanged, and when the first parameter is 1, the defrost time needs to be reduced. Afterwards, by considering the permutation and combination relationship among the sum of the three parameters according to the size, the misjudgment of defrosting can be prevented, and there are corresponding defrost time adjustment methods in different situations, thereby improving the accuracy of control.

[0084] In some embodiments, the control unit 104 determines a first parameter based on the relationship between the outdoor dew point temperature and the preset outdoor dew point temperature, including: if the outdoor dew point temperature is equal to the preset outdoor dew point temperature, the first parameter is 0; if the outdoor dew point temperature is greater than the preset outdoor dew point temperature, the first parameter is -1; if the outdoor dew point temperature is less than the preset outdoor dew point temperature, the first parameter is 1.

[0085] The preset outdoor dew point temperature t0 is a temperature value predicted according to the weather and temperature conditions, which is used to determine whether the outdoor dew point temperature t1 is reduced or increased, and then determine whether the frosting of the outdoor unit is aggravated. Specifically, when t0<t1, it means that the outdoor dew point temperature is reduced. At this time, the water vapor in the air is more likely to reach saturation and condense. When the surface temperature of the outdoor heat exchanger is the same, the outdoor unit is more likely to frost and the frosting situation is aggravated. Therefore, the first parameter is -1, which means that the defrosting time is increased. When t0>t1, it means that the outdoor dew point temperature is increased and the frosting of the outdoor unit is relatively weakened. Therefore, the first parameter is 1, which means that the defrosting time is shortened. When t0=t1, it means that the outdoor dew point temperature has not changed. At this time, the first parameter is 0, which means that the defrosting time remains unchanged.

[0086] In some embodiments, the control unit 104, based on the relationship between the operating time in the previous two heating modes after the air conditioner is turned on this time, includes: if the operating time in the previous heating mode is equal to the operating time in the previous heating mode, the second parameter is 0; if the operating time in the previous heating mode is less than the operating time in the previous heating mode, the second parameter is -1; if the operating time in the previous heating mode is greater than the operating time in the previous heating mode, the second parameter is 1.

[0087] When the air conditioner is heating, it cycles continuously between the heating mode and the defrosting mode, and the running time in each heating mode is counted separately. For example, when the air conditioner starts to defrost, the running time of the unit between the end of the last defrosting and the start of the current defrosting is taken as the running time of the air conditioner in the last heating mode. Since the air conditioner cycles under heating-defrosting, the faster and more serious the frost on the outdoor unit, the more frequently the air conditioner defrosts, and the defrosting time will also increase, resulting in a gradual decrease in the running time in the heating mode. Therefore, it can be judged whether the frosting of the air conditioner is getting more and more serious based on the size relationship between the running time s1 in the last heating mode and the running time s2 in the last heating mode. Specifically, when s1<s2, it means that the running time of the air conditioner in the heating mode is gradually decreasing, and the frosting of the outdoor unit is serious, so the second parameter is -1, that is, the defrosting time is increased. When s1>s2, it means that the running time in the heating mode has increased, and the frosting of the outdoor unit has been alleviated, so the second parameter is 1, that is, the defrosting time is reduced. When s1=s2, it means that the frosting condition has not changed, the second parameter is 0, and the defrosting time remains unchanged.

[0088] In some embodiments, the control unit 104 determines a third parameter based on the relationship between the tube temperatures of the outdoor heat exchanger after the first two defrosts, including: if the tube temperature of the outdoor heat exchanger after the last defrost is equal to the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is 0; if the tube temperature of the outdoor heat exchanger after the last defrost is less than the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is -1; if the tube temperature of the outdoor heat exchanger after the last defrost is greater than the tube temperature of the outdoor heat exchanger after the previous defrost, the third parameter is 1.

[0089] The air conditioner will stop defrosting after the set defrosting time is reached. If the outdoor environment is bad, the defrosting effect will be worse, and the tube temperature of the outdoor heat exchanger will be lower when the defrosting is finished, that is, the frosting of the outdoor unit will be aggravated. Therefore, the frosting condition of the outdoor unit can be judged according to the outdoor heat exchanger tube temperature T1 after the last defrosting and the outdoor heat exchanger tube temperature T2 after the previous defrosting. Specifically, when T1<T2, it means that the tube temperature of the outdoor heat exchanger drops after defrosting, and the frosting condition of the outdoor unit is aggravated, so the third parameter is -1, that is, the defrosting time is increased. When T1>T2, it means that the tube temperature of the outdoor heat exchanger rises after defrosting, and the frosting condition of the outdoor unit is weakened, so the third parameter is 1, that is, the defrosting time is reduced. When T1=T2, it means that the frosting condition has not changed, the third parameter is 0, and the defrosting time remains unchanged.

[0090] The control unit 104 is further configured to determine the sum of the first parameter, the second parameter, and the third parameter. The specific functions and processing of the control unit 104 refer to step S220.

[0091] The control unit 104 is further configured to increase the preset operation time adjustment amount based on the defrosting operation time of the previous defrosting if the sum of the first parameter, the second parameter, and the third parameter is greater than 0, and use the result as the duration of this defrosting. The specific functions and processing of the control unit 104 refer to step S230.

[0092] The control unit 104 is further configured to use the defrost operation time of the last defrost as the time of this defrost if the sum of the first parameter, the second parameter and the third parameter is equal to 0. The specific functions and processing of the control unit 104 refer to step S240.

[0093] The control unit 104 is further configured to reduce the preset operation time adjustment amount based on the defrosting operation time of the previous defrosting if the sum of the first parameter, the second parameter, and the third parameter is less than 0, and use the result as the duration of this defrosting. The specific functions and processing of the control unit 104 refer to step S250.

[0094] Inaccurate parameter detection may occur during the operation of the air conditioner, which may lead to misjudgment of defrosting. This solution determines the adjustment strategy of the defrosting time according to the outdoor dew point temperature, the operating time in the heating mode, and the changes in the outdoor heat exchanger tube temperature to prevent misjudgment of defrosting and improve the accuracy of control. At the same time, it avoids incomplete defrosting or excessive defrosting, thereby improving the operating efficiency of the air conditioner.

[0095] In some embodiments, the control unit 104 is also configured to, after determining the duration of this defrost, determine whether the duration of this defrost is greater than the preset maximum frost duration or less than the preset minimum frost duration; if the duration of this defrost is greater than the preset maximum frost duration, the preset maximum frost duration will be used as the duration of this defrost; if the duration of this defrost is less than the preset minimum frost time, the preset minimum frost time will be used as the duration of this defrost.

[0096] In order to ensure the operating efficiency of the air conditioner and avoid the situation where the defrosting time is too long and affects the indoor comfort and the defrosting time is too short and causes incomplete defrosting, the system sets the maximum defrosting time and the minimum defrosting time to limit the defrosting process. After determining the defrosting time, if the defrosting time exceeds the maximum defrosting time or is less than the minimum defrosting time, the defrosting time will be adjusted and the maximum defrosting time or the minimum defrosting time will be used as the defrosting time. max It is twice the defrost time of the air conditioner for the first defrost x1, that is, X max =2*x1. Minimize frost duration X min It is half of the defrosting time x1 of the first defrosting of the air conditioner, that is, X min=0.5*x1.

[0097] The control unit 104 is further configured to terminate the defrosting after the defrosting time reaches the current defrosting time, and control the air conditioner to switch to the heating mode. The specific functions and processing of the control unit 104 refer to step S140.

[0098] Figure 5 FIG. 1 is a flow chart of determining the defrosting time of an air conditioner in the control method of the present invention. Figure 5 As shown, the method includes:

[0099] Step 11, after the air conditioner starts defrosting, determine whether this is the first defrosting after the air conditioner is powered on. If this is the first defrosting, enter the defrosting, and end the defrosting after the surface temperature of the outdoor heat exchanger T≥15℃ and lasts for 1min, and store the duration of this defrosting. If this is not the first defrosting, obtain the outdoor dew point temperature ti, the preset outdoor dew point temperature ti+1, the operating time si-1 in the last heating mode, the operating time si-2 in the last heating mode, the surface temperature Ti-1 of the outdoor heat exchanger after the last defrosting, and the surface temperature Ti-2 of the outdoor heat exchanger after the last defrosting, and then execute steps 12, 13, and 14 respectively.

[0100] Step 12, determine the value of δ1 according to the magnitude relationship between ti and ti+1. If ti+1=ti, then δ1=0; if ti+1>ti, then δ1=1; if ti+1<ti, then δ1=-1. Then execute step 15.

[0101] Step 13, determine the value of δ2 according to the magnitude relationship between si-1 and si-2. If si-1=si-2 or there is no si-2, then δ2=0; if si-1>si-2, then δ2=1; if si-1<si-2, then δ2=-1. Then execute step 15.

[0102] Step 14, determine the value of δ3 according to the magnitude relationship between Ti-1 and Ti-2. If Ti-1 = Ti-2 or there is no Ti-2, then δ3 = 0; if Ti-1 > Ti-2, then δ3 = 1; if Ti-1 < Ti-2, then δ3 = -1. Then execute step 15.

[0103] Step 15, δ=δ1+δ2+δ3. When δ>0, the defrosting time of this defrosting is xi=x i-1 +0.1x1,x i-1 is the defrost time of the last defrost, x1 is the defrost time of the first defrost, if x i >2x1 then x i =2x1. When δ=0, x i =x i-1 When δ<0, xi=xi-1 -0.1x1, if x i <0.5x1 then x i =0.5x1. Then when the defrost time reaches x i Then end the defrosting.

[0104] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0105] By adopting the technical solution of the present invention, when the air conditioner is in heating operation, it is determined whether to start defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode after this startup; if it is determined to start defrosting, the air conditioner is controlled to switch to the cooling mode, and the duration of this defrosting is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time; after the defrosting reaches the defrosting time, the defrosting is terminated and the air conditioner is switched to the heating mode. By determining whether to perform defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode, and controlling the defrosting time, accurate defrosting detection is achieved, incomplete defrosting or excessive defrosting is avoided, and the operating efficiency of the air conditioner is improved.

[0106] According to an embodiment of the present invention, an air conditioner corresponding to a control device for air conditioner defrosting is also provided. The air conditioner may include: the control device for air conditioner defrosting described above.

[0107] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0108] By adopting the technical solution of the present invention, when the air conditioner is in heating operation, it is determined whether to start defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode after this startup; if it is determined to start defrosting, the air conditioner is controlled to switch to the cooling mode, and the duration of this defrosting is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time; after the defrosting reaches the defrosting time, the defrosting is terminated and the air conditioner is switched to the heating mode. By determining whether to perform defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode, and controlling the defrosting time, accurate defrosting detection is achieved, incomplete defrosting or excessive defrosting is avoided, and the operating efficiency of the air conditioner is improved.

[0109] According to an embodiment of the present invention, a storage medium corresponding to the air conditioner defrosting control method is also provided, the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the air conditioner defrosting control method described above.

[0110] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0111] By adopting the technical solution of the present invention, when the air conditioner is in heating operation, it is determined whether to start defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode after this startup; if it is determined to start defrosting, the air conditioner is controlled to switch to the cooling mode, and the duration of this defrosting is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time; after the defrosting reaches the defrosting time, the defrosting is terminated and the air conditioner is switched to the heating mode. By determining whether to perform defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode, and controlling the defrosting time, accurate defrosting detection is achieved, incomplete defrosting or excessive defrosting is avoided, and the operating efficiency of the air conditioner is improved.

[0112] According to an embodiment of the present invention, a computer program product corresponding to the air conditioner defrosting control method is also provided. The computer program product includes a computer program. When the computer program product is processed and executed, the steps of the air conditioner defrosting control method are implemented.

[0113] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0114] By adopting the technical solution of the present invention, when the air conditioner is in heating operation, it is determined whether to start defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode after this startup; if it is determined to start defrosting, the air conditioner is controlled to switch to the cooling mode, and the duration of this defrosting is determined according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time; after the defrosting reaches the defrosting time, the defrosting is terminated and the air conditioner is switched to the heating mode. By determining whether to perform defrosting according to the outdoor heat exchanger tube temperature, the outdoor dew point temperature, and the operating time of the air conditioner in the heating mode, and controlling the defrosting time, accurate defrosting detection is achieved, incomplete defrosting or excessive defrosting is avoided, and the operating efficiency of the air conditioner is improved.

[0115] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0116] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A method for controlling air conditioner defrosting, characterized in that: The method comprises: When the air conditioner is running in the heating mode, the pipe temperature of the outdoor heat exchanger of the air conditioner, the outdoor dew point temperature, and the running time of the air conditioner in each heating mode after the air conditioner is turned on this time are obtained; Determining whether to start defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time; If it is determined to start defrosting, the air conditioner is controlled to switch to the cooling mode, and the duration of this defrosting is determined according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time; After the defrosting time reaches the current defrosting time, the defrosting is ended, and the air conditioner is controlled to switch to the heating mode.

2. The air conditioner defrosting control method according to claim 1, characterized in that: Also includes: After determining to start defrosting, if it is determined that this defrost is the first defrost after the air conditioner is turned on, the defrost will be terminated after the tube temperature of the outdoor heat exchanger reaches the preset tube temperature and lasts for a preset time; if it is determined that this defrost is not the first defrost after the air conditioner is turned on, the duration of this defrost is determined based on the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time.

3. The air conditioner defrosting control method according to claim 1, characterized in that: Determining whether to perform defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time includes: Determine whether the operation time in the current heating mode reaches a preset time; If the operation time in the current heating mode reaches the preset time, determining whether the tube temperature of the outdoor heat exchanger is less than the preset temperature; If the tube temperature of the outdoor heat exchanger is lower than the preset temperature, determining the difference between the outdoor dew point temperature and the tube temperature of the outdoor heat exchanger; If the difference between the outdoor dew point temperature and the tube temperature of the outdoor heat exchanger is greater than or equal to the preset temperature difference, it is determined to perform defrosting.

4. The air conditioner defrosting control method according to any one of claims 1 to 3, characterized in that: Determining the duration of this defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time, including: The first parameter is determined according to the relationship between the outdoor dew point temperature and the preset outdoor dew point temperature; the second parameter is determined according to the relationship between the operating time of the air conditioner in the first two heating modes after the air conditioner is turned on this time; the third parameter is determined according to the relationship between the pipe temperatures of the outdoor heat exchanger after the first two defrosting operations; the first parameter, the second parameter, and the third parameter all include: -1, 0, 1; Determine the size of the sum of the first parameter, the second parameter, and the third parameter; If the sum of the first parameter, the second parameter and the third parameter is greater than 0, the preset running time adjustment amount is added to the defrosting running time of the previous defrosting, and the result is used as the duration of this defrosting; If the sum of the first parameter, the second parameter and the third parameter is equal to 0, the defrost operation time of the last defrost is used as the time of this defrost; If the sum of the first parameter, the second parameter and the third parameter is less than 0, the preset operation time adjustment amount is reduced based on the defrost operation time of the previous defrost, and the result is used as the duration of this defrost.

5. The air conditioner defrosting control method according to claim 4, characterized in that: Determining the first parameter according to the magnitude relationship between the outdoor dew point temperature and a preset outdoor dew point temperature includes: If the outdoor dew point temperature is equal to the preset outdoor dew point temperature, the first parameter is 0; If the outdoor dew point temperature is greater than the preset outdoor dew point temperature, the first parameter is -1; If the outdoor dew point temperature is less than the preset outdoor dew point temperature, the first parameter is 1; and / or, According to the relationship between the operation time of the air conditioner in the previous two heating modes after the air conditioner is turned on this time, it includes: If the running time in the last heating mode is equal to the running time in the last heating mode, the second parameter is 0; If the running time in the last heating mode is less than the running time in the last heating mode, the second parameter is -1; If the running time in the last heating mode is longer than the running time in the last heating mode, the second parameter is 1; and / or, The third parameter is determined according to the relationship between the tube temperatures of the outdoor heat exchanger after the first two defrosting operations, including: If the tube temperature of the outdoor heat exchanger after the last defrost is equal to the tube temperature of the outdoor heat exchanger after the last defrost, the third parameter is 0; If the tube temperature of the outdoor heat exchanger after the last defrost is lower than the tube temperature of the outdoor heat exchanger after the last defrost, the third parameter is -1; If the tube temperature of the outdoor heat exchanger after the last defrost is greater than the tube temperature of the outdoor heat exchanger after the last defrost, the third parameter is 1.

6. The air conditioner defrosting control method according to claim 4, characterized in that: Also includes: After determining the duration of this defrost, judging whether the duration of this defrost is greater than a preset maximum defrost duration or less than a preset minimum defrost duration; If the duration of this defrost is longer than the preset maximum defrost duration, the preset maximum defrost duration will be used as the duration of this defrost; If the duration of this defrost is less than the preset minimum defrost time, the preset minimum defrost time will be used as the duration of this defrost.

7. A control device for air conditioner defrosting, characterized in that: The device comprises: An acquisition unit is configured to acquire, during the operation of the air conditioner in the heating mode, a tube temperature of an outdoor heat exchanger of the air conditioner, an outdoor dew point temperature, and an operation time of the air conditioner in each heating mode after the air conditioner is turned on this time; A control unit configured to determine whether to start defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time; The control unit is further configured to control the air conditioner to switch to a cooling mode if it is determined to start defrosting, and determine the duration of this defrosting according to the tube temperature of the outdoor heat exchanger, the outdoor dew point temperature, and the operating time; The control unit is further configured to terminate defrosting after the defrosting time reaches the duration of this defrosting, and control the air conditioner to switch to a heating mode.

8. An air conditioner, characterized in that: include: The air conditioner defrosting control device as claimed in claim 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the air-conditioning defrosting control method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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