A heat pump air conditioner and a control method, device and readable storage medium thereof

Abstract

This invention provides a heat pump air conditioner and its control method, apparatus, and readable storage medium. The control method includes: determining whether it is necessary to enter a target control mode; when the determination is yes, controlling the heat pump air conditioner to enter the target control mode; wherein, the target control mode includes: controlling the outdoor fan speed according to the inlet water temperature; and controlling the water pump duty cycle according to the high pressure. The problem solved by this invention is that the technical solutions in related technologies cannot solve the problem of high-pressure protection occurring in the heat pump air conditioner after defrosting.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a heat pump air conditioner and its control method, apparatus and readable storage medium. Background Technology

[0002] In winter, heat pump air conditioners are prone to frost formation when the ambient temperature is low and the water temperature is high. When the system is frosted, the heat pump air conditioner will enter defrost mode. When defrosting is about to end, due to the high water temperature and high low pressure of the system, the high pressure will rise rapidly. Even if the compressor frequency is low at this time, the high pressure protection is likely to be triggered.

[0003] In the existing technology, most manufacturers will force the expansion valve to open to the maximum degree in order to solve this problem, but this still cannot perfectly solve the problem. The heat pump air conditioning system will still sometimes experience high pressure protection. Some manufacturers turn on the fan in advance, but the air speed is too fast and the pressure drops too quickly, which makes it impossible to meet the valve cutting pressure difference.

[0004] Therefore, it is evident that the problem with the relevant technologies is that the technical solutions in the relevant technologies cannot solve the problem of high-pressure protection occurring in the heat pump air conditioner after defrosting. Summary of the Invention

[0005] The problem solved by this invention is that the technical solutions in the related technologies cannot solve the problem of high-pressure protection in heat pump air conditioners after defrosting.

[0006] To address the aforementioned problems, the primary objective of this invention is to provide a control method for a heat pump air conditioner.

[0007] The second objective of this invention is to provide a control device for a heat pump air conditioner.

[0008] A third objective of this invention is to provide a heat pump air conditioner.

[0009] A fourth objective of this invention is to provide a readable storage medium.

[0010] To achieve the first objective of this invention, embodiments of this invention provide a control method for a heat pump air conditioner, the control method comprising:

[0011] Determine whether it is necessary to enter the target control mode;

[0012] When the determination is yes, control the heat pump air conditioner to enter the target control mode;

[0013] The target control modes include: controlling the outdoor fan speed based on the inlet water temperature; and controlling the water pump duty cycle based on the high pressure.

[0014] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: According to the inlet water temperature and high pressure, the outdoor fan speed and water pump duty cycle are adaptively adjusted respectively. After the heat pump air conditioner finishes defrosting, the system pressure drops slowly, which not only prevents high pressure protection, but also meets the valve pressure difference, effectively improving the user's comfort experience.

[0015] In one embodiment of the present invention, determining whether it is necessary to enter the target control mode includes:

[0016] Based on the inlet water temperature, high pressure, low pressure, and defrost temperature, determine whether it is necessary to enter the target control mode.

[0017] Compared with the prior art, the technical effect achieved by adopting this technical solution is that the solution of this embodiment can more accurately determine whether it is necessary to enter the target control mode, thereby improving the reliability of the control method of the present invention.

[0018] In one embodiment of the present invention, determining whether to enter the target control mode based on the inlet water temperature, high pressure, low pressure, and defrost temperature includes:

[0019] When entering defrost mode, the inlet water temperature is compared with the first temperature threshold.

[0020] When the inlet water temperature is greater than the first temperature threshold, after the defrosting mode ends, the high pressure is compared with the first pressure threshold to determine whether the first condition is met; the defrosting temperature is compared with the second temperature threshold to determine whether the second condition is met; and the difference between the high pressure and the low pressure is compared with the second pressure threshold to determine whether the third condition is met.

[0021] If the first, second, and third conditions are all met, it is determined that the target control mode needs to be entered.

[0022] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: Through the solution of this embodiment, the control method of the present invention can more accurately enter the target control mode, which avoids the occurrence of high voltage protection on the one hand, and improves the reliability and accuracy of the control method of the present invention on the other hand.

[0023] In one embodiment of the present invention, controlling the outdoor fan speed based on the inlet water temperature includes:

[0024] Determine the target rotation speed based on the inlet water temperature;

[0025] The frequency ramp rate of the outdoor fan is determined based on the difference between the target speed and the actual speed.

[0026] The outdoor fan speed is controlled starting from the actual speed and increased to the target speed by increasing the outdoor fan frequency.

[0027] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: In the solution of this embodiment, when the target speed differs greatly from the actual speed, by increasing the frequency ramp rate of the outdoor fan, the outdoor fan speed can reach the target speed more quickly, avoiding the situation of high-voltage protection due to the slow speed increase of the outdoor fan, and effectively improving the reliability of the control method of the present invention.

[0028] In one embodiment of the present invention, determining the target rotational speed based on the inlet water temperature includes:

[0029] Determine the water temperature correction factor based on the inlet water temperature;

[0030] Target speed = Maximum outdoor fan speed × Water temperature correction factor;

[0031] The water temperature correction factor ranges from 0 to 1, with a higher inlet water temperature resulting in a larger correction factor.

[0032] Compared with existing technologies, the technical effects achieved by this solution are as follows: when the inlet water temperature is low, if the outdoor fan speed is high, it will lead to excessively low low pressure and excessively rapid water temperature drop, thereby affecting the user's comfort experience; in this embodiment, different water temperature correction coefficients are determined according to different inlet water temperatures, and then different target speeds are determined, which effectively improves the user's comfort experience.

[0033] In one embodiment of the present invention, controlling the duty cycle of the water pump according to the high pressure includes:

[0034] Determine the pump duty cycle compensation value based on the high pressure.

[0035] Determine the target duty cycle based on the pump duty cycle compensation value;

[0036] Adjust the water pump duty cycle to the target duty cycle;

[0037] Wherein, target duty cycle = actual duty cycle + water pump duty cycle compensation value.

[0038] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: In this embodiment, the target duty cycle is determined according to the high pressure, and the water pump duty cycle is controlled to be adjusted to the target duty cycle, so that the water pump duty cycle can be adaptively changed according to the high pressure, thereby preventing the occurrence of high pressure protection.

[0039] In one embodiment of the present invention, the pump duty cycle compensation value increases with the increase of high pressure.

[0040] Compared with existing technologies, the technical effects achieved by this solution are as follows: the pump duty cycle adjustment prioritizes system pressure regulation. When the system pressure is too high, the pump speed is reduced by increasing the pump duty cycle compensation value, so that the water temperature drops rapidly, the low pressure is reduced, and the high pressure is reduced, thereby effectively preventing the occurrence of high pressure protection.

[0041] To achieve the second objective of this invention, an embodiment of this invention provides a control device for a heat pump air conditioner, the control device comprising:

[0042] The judgment module is used to determine whether it is necessary to enter the target control mode.

[0043] The control module is used to control the heat pump air conditioner to enter the target control mode when the judgment is yes;

[0044] The target control modes include: controlling the outdoor fan speed based on the inlet water temperature; and controlling the water pump duty cycle based on the high pressure.

[0045] The control device for the heat pump air conditioner in this embodiment of the invention implements the steps of the control method for the heat pump air conditioner as described in any embodiment of the invention, and therefore has all the beneficial effects of the control method for the heat pump air conditioner as described in any embodiment of the invention, which will not be repeated here.

[0046] To achieve the third objective of the present invention, an embodiment of the present invention provides a heat pump air conditioner, which includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the control method of the heat pump air conditioner as described in any embodiment of the present invention.

[0047] The heat pump air conditioner of the present invention implements the steps of the control method of the heat pump air conditioner as described in any embodiment of the present invention, and therefore has all the beneficial effects of the control method of the heat pump air conditioner as described in any embodiment of the present invention, which will not be repeated here.

[0048] To achieve the fourth objective of the present invention, embodiments of the present invention provide a readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of a heat pump air conditioner control method as described in any embodiment of the present invention.

[0049] The readable storage medium of the present invention implements the steps of the control method of the heat pump air conditioner as described in any embodiment of the present invention, and thus has all the beneficial effects of the control method of the heat pump air conditioner as described in any embodiment of the present invention, which will not be repeated here. Attached Figure Description

[0050] Figure 1 This is a flowchart illustrating the steps of a heat pump air conditioner control method according to some embodiments of the present invention;

[0051] Figure 2 This is a system diagram of a heat pump air conditioner according to some embodiments of the present invention.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1-Compressor; 2-Four-way valve; 3-Water-side heat exchanger; 4-Water pump; 5-Electronic expansion valve; 6-Electronic heating; 7-Finned heat exchanger; 8-Temperature sensor; 9-Fan blade; 10-Gas-liquid separator. Detailed Implementation

[0054] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0055] See Figure 1 This embodiment provides a control method for a heat pump air conditioner, the control method including:

[0056] S100: Determine whether it is necessary to enter the target control mode;

[0057] S200: When the judgment is yes, control the heat pump air conditioner to enter the target control mode;

[0058] The target control modes include: controlling the outdoor fan speed based on the inlet water temperature; and controlling the water pump duty cycle based on the high pressure.

[0059] In existing technologies, heat pump air conditioning products are prone to frosting when the ambient temperature is low and the water temperature is high due to the heat pump heating the water. When the system is frosted, the heat pump air conditioner will enter the defrost mode. In the defrost mode, the heat pump air conditioner cools. When the defrost is about to end, the high water temperature and high low pressure of the system will cause the high pressure to rise rapidly. Even if the compressor frequency is low at this time, the high pressure protection is likely to be triggered.

[0060] In this embodiment, it is determined whether it is necessary to enter the target control mode; if the determination is yes, the heat pump air conditioner is controlled to enter the target control mode; if the determination is no, the heat pump air conditioner responds to the user's command and operates normally.

[0061] It should be noted that after defrosting, the heat pump air conditioning system undergoes a reversing preparation time. After this preparation time, the heat pump air conditioner will respond to user commands and resume operation. When the heat pump air conditioner enters the reversing preparation time after defrosting and determines that it needs to enter the target control mode, it will control the heat pump air conditioner to enter the target control mode. See [link to relevant documentation]. Figure 2 , Figure 2 This is a system diagram of the heat pump air conditioner in this embodiment; the inlet water temperature is the temperature at the inlet of the water-side heat exchanger 3 in the diagram, and the temperature sensor is located between the water-side heat exchanger 3 and the electric heater 6. Figure 2 Tin represents the inlet water temperature; Figure 2 Pd represents high pressure, which is measured by a high pressure sensor. Figure 2 Td represents the compressor outlet temperature, which is measured by a temperature sensor. Figure 2 The "Two" indicates the outlet water temperature, which is measured by a temperature sensor located at the outlet of the water-side heat exchanger 3.

[0062] Furthermore, the outdoor fan speed is controlled according to the inlet water temperature. During the defrosting process of a heat pump air conditioner, the outdoor fan is turned off, and the system pressure is high. Controlling the outdoor fan to turn on can effectively reduce the high pressure. The required outdoor fan speed varies depending on the inlet water temperature. For example, when the water temperature is low, if the outdoor fan speed is too high, it will lead to excessively low low pressure and a rapid drop in water temperature, affecting the user's comfort experience. Therefore, adaptively controlling the outdoor fan speed according to the inlet water temperature can improve the user's comfort experience.

[0063] Furthermore, by controlling the pump duty cycle based on the high pressure, and by adaptively adjusting the pump duty cycle based on the high pressure, the pump speed can be adjusted, thereby regulating the outlet water temperature, low pressure, and high pressure, effectively preventing the occurrence of high pressure protection.

[0064] Understandably, the solution in this embodiment adaptively adjusts the outdoor fan speed and water pump duty cycle according to the inlet water temperature and high pressure, respectively. After the heat pump air conditioner finishes defrosting, the system pressure drops slowly, which not only prevents high pressure protection but also meets the valve pressure difference requirements, effectively improving the user's comfort experience.

[0065] Furthermore, in a specific embodiment, determining whether to enter the target control mode includes:

[0066] Based on the inlet water temperature, high pressure, low pressure, and defrost temperature, determine whether it is necessary to enter the target control mode.

[0067] It should be noted that, see Figure 2 , Figure 2 This is a system diagram of the heat pump air conditioner in this embodiment. Figure 2 In the middle, Pe represents the low-pressure level, which is measured by a low-pressure sensor; the defrost temperature is... Figure 2 The temperature is measured by the temperature sensor 8 located on the finned heat exchanger 7.

[0068] Understandably, the solution in this embodiment can more accurately determine whether it is necessary to enter the target control mode, thereby improving the reliability of the control method of the present invention.

[0069] Furthermore, in a specific embodiment, determining whether to enter the target control mode based on the inlet water temperature, high pressure, low pressure, and defrost temperature includes:

[0070] When entering defrost mode, the inlet water temperature is compared with the first temperature threshold.

[0071] When the inlet water temperature is greater than the first temperature threshold, after the defrosting mode ends, the high pressure is compared with the first pressure threshold to determine whether the first condition is met; the defrosting temperature is compared with the second temperature threshold to determine whether the second condition is met; and the difference between the high pressure and the low pressure is compared with the second pressure threshold to determine whether the third condition is met.

[0072] If the first, second, and third conditions are all met, it is determined that the target control mode needs to be entered.

[0073] Optionally, the first temperature threshold ranges from 45℃ to 60℃; preferably, the first temperature threshold is 50℃.

[0074] Optionally, the first pressure threshold ranges from 3.5 MPa to 4.5 MPa; preferably, the first pressure threshold is 3.8 MPa.

[0075] Optionally, the second temperature threshold is in the range of 35℃-60℃; preferably, the second temperature threshold is 35℃.

[0076] Optionally, the second pressure threshold ranges from 0.8 MPa to 3 MPa; preferably, the first pressure threshold is 2.5 MPa.

[0077] In this embodiment, when the heat pump air conditioning system enters the defrost mode, the inlet water temperature is compared with a first temperature threshold. When the water temperature is low, the heat pump air conditioning system is less likely to trigger high-pressure protection. Therefore, when the inlet water temperature is greater than the first temperature threshold, the heat pump air conditioning system meets the basic conditions for high-pressure protection, and subsequent judgments can be made. When the inlet water temperature is less than or equal to the first temperature threshold, the heat pump air conditioning system is less likely to trigger high-pressure protection, and the control method of this embodiment can be terminated. After the defrost mode ends and the reversal preparation time ends, the system can be shut down or continue heating according to the user's command.

[0078] It should be noted that when the heat pump air conditioner enters the defrost mode, determining whether to enter the control method based on the inlet water temperature can effectively improve the efficiency of the control method of the present invention. That is, when the inlet water temperature is less than or equal to the first temperature threshold, the control method of the present invention can be directly terminated, thereby improving the implementation efficiency and reliability of the control method of the present invention.

[0079] Furthermore, when the inlet water temperature is greater than the first temperature threshold, it is determined whether the first, second, and third conditions can be met simultaneously; that is, the high pressure is compared with the first pressure threshold to determine whether the first condition is met; the defrost temperature is compared with the second temperature threshold to determine whether the second condition is met; and the difference between the high pressure and the low pressure is compared with the second pressure threshold to determine whether the third condition is met.

[0080] Furthermore, the high pressure is compared with the first pressure threshold to determine whether the first condition is met. When the high pressure is greater than or equal to the first pressure threshold, it indicates that the high pressure is too high. At the end of defrosting, the high pressure is likely to reach the highest protection point. Therefore, the first condition is met at this time.

[0081] Furthermore, the defrost temperature is compared with the second temperature threshold to determine whether the second condition is met. When the defrost temperature is greater than or equal to the second temperature threshold, the temperature of the defrost temperature sensor is high, indicating that the frost has been completely removed. At this time, there is a risk of high voltage protection. Therefore, it is determined that the second condition is met.

[0082] Furthermore, the difference between the high pressure and the low pressure is compared with the second pressure threshold to determine whether the third condition is met. When the difference between the high pressure and the low pressure is greater than or equal to the second pressure threshold, it indicates that the pressure difference is large and the frost has been completely removed. At this point, the third condition is considered to be met.

[0083] Furthermore, if the first, second, and third conditions are all met, it is determined that the target control mode needs to be entered. If the first, second, and third conditions are all met, it means that the frost has been completely removed and the water temperature and high pressure are both high. At this time, the high pressure protection is likely to occur, so it is determined that the target control mode needs to be entered.

[0084] Understandably, the solution in this embodiment enables the control method of the present invention to more accurately enter the target control mode, thereby avoiding the occurrence of high voltage protection and improving the reliability and accuracy of the control method of the present invention.

[0085] Furthermore, in one specific embodiment, controlling the outdoor fan speed based on the inlet water temperature includes:

[0086] Determine the target rotation speed based on the inlet water temperature;

[0087] The frequency ramp rate of the outdoor fan is determined based on the difference between the target speed and the actual speed.

[0088] The outdoor fan speed is controlled starting from the actual speed and increased to the target speed by increasing the outdoor fan frequency.

[0089] It should be noted that the actual rotational speed refers to the outdoor fan speed measured in real time.

[0090] In this embodiment, the frequency ramp-up rate of the outdoor fan is determined based on the difference between the target speed and the actual speed. The greater the difference between the target speed and the actual speed, the greater the frequency ramp-up rate of the outdoor fan, that is, the faster the outdoor fan speed is increased from the actual speed to the target speed.

[0091] For example, let the difference between the target speed and the actual speed be D, that is, target speed - actual speed = D. The relationship between the difference D and the frequency increase rate of the outdoor fan is shown in Table 1 below.

[0092] Table 1

[0093]

[0094] Understandably, in the scheme of this embodiment, when the target speed differs significantly from the actual speed, by increasing the frequency ramp rate of the outdoor fan, the outdoor fan speed can reach the target speed more quickly, avoiding the situation where high-voltage protection occurs due to the slow increase in outdoor fan speed, and effectively improving the reliability of the control method of the present invention.

[0095] Furthermore, in one specific embodiment, determining the target rotational speed based on the inlet water temperature includes:

[0096] Determine the water temperature correction factor based on the inlet water temperature;

[0097] Target speed = Maximum outdoor fan speed × Water temperature correction factor;

[0098] The water temperature correction factor ranges from 0 to 1, with a higher inlet water temperature resulting in a larger correction factor.

[0099] In this embodiment, a water temperature correction coefficient is determined based on the inlet water temperature. For example, let the inlet water temperature be T, and the relationship between the inlet water temperature T and the water temperature correction coefficient is shown in Table 2 below.

[0100] Table 2

[0101]

[0102] Optionally, the maximum speed of the outdoor fan is 850 r / s.

[0103] Understandably, when the inlet water temperature is low, if the outdoor fan speed is high, it will lead to excessively low low pressure and a rapid drop in water temperature, thus affecting the user's comfort experience. In the solution of this embodiment, different water temperature correction coefficients are determined according to different inlet water temperatures, thereby determining different target speeds, which effectively improves the user's comfort experience.

[0104] Furthermore, in one specific embodiment, controlling the pump duty cycle based on the high pressure includes:

[0105] Determine the pump duty cycle compensation value based on the high pressure.

[0106] Determine the target duty cycle based on the pump duty cycle compensation value;

[0107] Adjust the water pump duty cycle to the target duty cycle;

[0108] Wherein, target duty cycle = actual duty cycle + water pump duty cycle compensation value.

[0109] It should be noted that the actual duty cycle is a value obtained from real-time detection, while the water pump duty cycle compensation value is a value determined based on the high pressure.

[0110] Understandably, in this embodiment, determining the target duty cycle based on the high pressure and controlling the water pump duty cycle to adjust to the target duty cycle enables the water pump duty cycle to adapt to the high pressure, thereby preventing the occurrence of high pressure protection.

[0111] Furthermore, in one specific embodiment, the pump duty cycle compensation value increases with the increase of high pressure.

[0112] For example, let the high pressure be Pd, and the relationship between the high pressure Pd and the pump duty cycle compensation value is shown in Table 3 below.

[0113] Table 3

[0114]

[0115] Understandably, the pump duty cycle adjustment takes precedence over system pressure regulation. When the system pressure is too high, the pump speed is reduced by increasing the pump duty cycle compensation value, so that the water temperature drops rapidly, the low pressure decreases, and the high pressure is reduced, thereby effectively preventing the high pressure protection from occurring.

[0116] Furthermore, this embodiment provides a control device for a heat pump air conditioner, the control device including:

[0117] The judgment module is used to determine whether it is necessary to enter the target control mode.

[0118] The control module is used to control the heat pump air conditioner to enter the target control mode when the judgment is yes;

[0119] The target control modes include: controlling the outdoor fan speed based on the inlet water temperature; and controlling the water pump duty cycle based on the high pressure.

[0120] The control device for the heat pump air conditioner in this embodiment of the invention implements the steps of the control method for the heat pump air conditioner as described in any embodiment of the invention, and therefore has all the beneficial effects of the control method for the heat pump air conditioner as described in any embodiment of the invention, which will not be repeated here.

[0121] Furthermore, this embodiment provides a heat pump air conditioner, which includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the control method of the heat pump air conditioner as described in any embodiment of the present invention.

[0122] The heat pump air conditioner of the present invention implements the steps of the control method of the heat pump air conditioner as described in any embodiment of the present invention, and therefore has all the beneficial effects of the control method of the heat pump air conditioner as described in any embodiment of the present invention, which will not be repeated here.

[0123] Furthermore, this embodiment provides a readable storage medium on which a program or instructions are stored. When the program or instructions are executed by a processor, they implement the steps of the control method for a heat pump air conditioner as described in any embodiment of the present invention.

[0124] The readable storage medium of the present invention implements the steps of the control method of the heat pump air conditioner as described in any embodiment of the present invention, and thus has all the beneficial effects of the control method of the heat pump air conditioner as described in any embodiment of the present invention, which will not be repeated here.

[0125] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A control method of a heat pump air conditioner, characterized by, The control method comprises: According to the water inlet temperature, high pressure, low pressure and defrosting temperature, it is judged whether it is necessary to enter the target control mode; including: When entering the defrosting mode, the water inlet temperature is compared with the first temperature threshold value; When the water inlet temperature is greater than the first temperature threshold value, after the defrosting mode is ended, the high pressure is compared with the first pressure threshold value to judge whether the first condition is met, the defrosting temperature is compared with the second temperature threshold value to judge whether the second condition is met, and the difference between the high pressure and the low pressure is compared with the second pressure threshold value to judge whether the third condition is met; In the case that the first condition, the second condition and the third condition are all met, it is judged that it is necessary to enter the target control mode; the heat pump air conditioner is controlled to enter the target control mode; Wherein, the target control mode comprises: controlling the outdoor fan speed according to the water inlet temperature; controlling the water pump duty cycle according to the high pressure.

2. The control method according to claim 1, characterized by, The control method comprises: According to the water inlet temperature, high pressure, low pressure and defrosting temperature, it is judged whether it is necessary to enter the target control mode; including: When entering the defrosting mode, the water inlet temperature is compared with the first temperature threshold value; When the water inlet temperature is greater than the first temperature threshold value, after the defrosting mode is ended, the high pressure is compared with the first pressure threshold value to judge whether the first condition is met, the defrosting temperature is compared with the second temperature threshold value to judge whether the second condition is met, and the difference between the high pressure and the low pressure is compared with the second pressure threshold value to judge whether the third condition is met; 3. The control method according to claim 2, characterized by, In the case that the first condition, the second condition and the third condition are all met, it is judged that it is necessary to enter the target control mode; the heat pump air conditioner is controlled to enter the target control mode; Wherein, the target control mode comprises: controlling the outdoor fan speed according to the water inlet temperature; controlling the water pump duty cycle according to the high pressure. The control method comprises: According to the water inlet temperature, high pressure, low pressure and defrosting temperature, it is judged whether it is necessary to enter the target control mode; including:

4. The control method according to claim 1, characterized by, When entering the defrosting mode, the water inlet temperature is compared with the first temperature threshold value; When the water inlet temperature is greater than the first temperature threshold value, after the defrosting mode is ended, the high pressure is compared with the first pressure threshold value to judge whether the first condition is met, the defrosting temperature is compared with the second temperature threshold value to judge whether the second condition is met, and the difference between the high pressure and the low pressure is compared with the second pressure threshold value to judge whether the third condition is met; In the case that the first condition, the second condition and the third condition are all met, it is judged that it is necessary to enter the target control mode; the heat pump air conditioner is controlled to enter the target control mode; Wherein, the target control mode comprises: controlling the outdoor fan speed according to the water inlet temperature; controlling the water pump duty cycle according to the high pressure. The control method comprises:

5. The control method according to claim 4, characterized by According to the water inlet temperature, high pressure, low pressure and defrosting temperature, it is judged whether it is necessary to enter the target control mode; including:

6. A control device for a heat pump air conditioner, characterized by comprising: When entering the defrosting mode, the water inlet temperature is compared with the first temperature threshold value; When the water inlet temperature is greater than the first temperature threshold value, after the defrosting mode is ended, the high pressure is compared with the first pressure threshold value to judge whether the first condition is met, the defrosting temperature is compared with the second temperature threshold value to judge whether the second condition is met, and the difference between the high pressure and the low pressure is compared with the second pressure threshold value to judge whether the third condition is met; In the case that the first condition, the second condition and the third condition are all met, it is judged that it is necessary to enter the target control mode; the heat pump air conditioner is controlled to enter the target control mode; Wherein, the target control mode comprises: controlling the outdoor fan speed according to the water inlet temperature; controlling the water pump duty cycle according to the high pressure.

7. A heat pump air conditioner characterized by comprising: The control method comprises:

8. A readable storage medium, characterized by, According to the water inlet temperature, high pressure, low pressure and defrosting temperature, it is judged whether it is necessary to enter the target control mode; including: When entering the defrosting mode, the water inlet temperature is compared with the first temperature threshold value; When the water inlet temperature is greater than the first temperature threshold value, after the defrosting mode is ended, the high pressure is compared with the first pressure threshold value to judge whether the first condition is met, the defrosting temperature is compared with the second temperature threshold value to judge whether the second condition is met, and the difference between the high pressure and the low pressure is compared with the second pressure threshold value to judge whether the third condition is met; In the case that the first condition, the second condition and the third condition are all met, it is judged that it is necessary to enter the target control mode; the heat pump air conditioner is controlled to enter the target control mode; Wherein, the target control mode comprises: controlling the outdoor fan speed according to the water inlet temperature; controlling the water pump duty cycle according to the high pressure. The control method comprises: According to the water inlet temperature, high pressure, low pressure and defrosting temperature, it is judged whether it is necessary to enter the target control mode; including: When entering the defrosting mode, the water inlet temperature is compared with the first temperature threshold value; When the water inlet temperature is greater than the first temperature threshold value, after the defrosting mode is ended, the high pressure is compared with the first pressure threshold value to judge whether the first condition is met, the defrosting temperature is compared with the second temperature threshold value to judge whether the second condition is met, and the difference between the high pressure and the low pressure is compared with the second pressure threshold value to judge whether the third condition is met; In the case that the first condition, the second condition and the third condition are all met, it is judged that it is necessary to enter the target control mode; the heat pump air conditioner is controlled to enter the target control mode; Wherein, the target control mode comprises: controlling the outdoor fan speed according to the water inlet temperature; controlling the water pump duty cycle according to the high pressure. The control method comprises: According to the water inlet temperature, high pressure, low pressure and defrosting temperature, it is judged whether it is necessary to enter the target control mode; including: When entering the defrosting mode, the water inlet temperature is compared with the first temperature threshold value; When the water inlet temperature is greater than the first temperature threshold value, after the defrosting mode is ended, the high pressure is compared with the first pressure threshold value to judge whether the first condition is met, the defrosting temperature is compared with the second temperature threshold value to judge whether the second condition is met, and the difference between the high pressure and the low pressure is compared with the second pressure threshold value to judge whether the third condition is met; In the case that the first condition, the second condition and the third condition are all met, it is judged that it is necessary to enter the target control mode; the heat pump air conditioner is controlled to enter the target control mode; Wherein, the target control mode comprises: controlling the outdoor fan speed according to the water inlet temperature; controlling the water pump duty cycle according to the high pressure.

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