Control Method, Device, Air Conditioner and Storage Medium for Outdoor Fan of Air Conditioner

Abstract

The present invention discloses a control method, device, air conditioner and computer-readable storage medium for an outdoor fan of an air conditioner. The method includes the steps of: obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature; determining the actual condenser outlet temperature according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature; and adjusting the rotation speed of the outdoor fan according to the outdoor ambient temperature and the actual condenser outlet temperature. By applying the control method of the outdoor fan of the air conditioner in the present invention to the air conditioner, the technical problem of poor refrigeration effect of the air conditioner caused by refrigerant deposition in the outdoor unit of the air conditioner can be solved, and the comfort experience of users can be improved.

Description

Technical Field

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

[0002] At present, in a non-pressure-controlled heat pump air conditioning system, during refrigeration, the control of the outdoor fan is mainly based on the temperature at the outlet of the condenser to control the rotation speed of the outdoor fan. In order to take into account the problem of clean defrosting at low temperature during heating, generally, the condenser outlet temperature sensor is set at the outlet of the bottommost path of the condenser.

[0003] For some regions, there is also a refrigeration demand in an environment with a relatively low outdoor ambient temperature. At this time, the outdoor condenser is prone to refrigerant deposition; and in a multi-connected air conditioner with a small load refrigeration demand, the bottom condenser is also prone to refrigerant deposition. At this time, the condenser outlet sensor cannot truly feedback the entire condensation outlet temperature. Therefore, only changing the outdoor fan according to the existing change in the condenser outlet temperature will cause a lag in control feedback, and thus easily trigger the system pressure overprotection, affecting the refrigeration effect of the air conditioner. Summary of the Invention

[0004] The main purpose of the present invention is to provide a control method and device for an outdoor fan of an air conditioner, an air conditioner, and a computer-readable storage medium, aiming to solve the technical problem that the refrigerant deposition of the outdoor unit of the air conditioner leads to poor refrigeration effect of the air conditioner.

[0005] To achieve the above object, the present invention provides a control method for an outdoor fan of an air conditioner, which obtains the condenser outlet temperature and the refrigerant heat dissipation pipe temperature;

[0006] Determines the actual condenser outlet temperature according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature;

[0007] Adjusts the rotation speed of the outdoor fan according to the outdoor ambient temperature and the actual condenser outlet temperature.

[0008] Optionally, the step of determining the actual condenser outlet temperature according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature includes:

[0009] Obtains a first difference between the refrigerant heat dissipation pipe temperature and the condenser outlet temperature;

[0010] When the first difference is greater than or equal to a first temperature threshold, determines the refrigerant heat dissipation pipe temperature as the actual condenser outlet temperature;

[0011] When the first difference is less than the first temperature threshold, determines the condenser outlet temperature as the actual condenser outlet temperature.

[0012] Optionally, the step of adjusting the rotation speed of the outdoor fan according to the outdoor ambient temperature and the actual condenser outlet temperature includes:

[0013] Determine a target condenser temperature range according to the outdoor ambient temperature;

[0014] Adjust the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature.

[0015] Optionally, the step of adjusting the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes:

[0016] When the actual condenser outlet temperature is within the target condenser temperature range, maintain the current rotation speed of the outdoor fan;

[0017] Return to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

[0018] Optionally, the step of adjusting the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes:

[0019] When the actual condenser outlet temperature is less than the minimum threshold of the target condenser temperature range, reduce the current rotation speed of the outdoor fan;

[0020] Return to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

[0021] Optionally, the step of adjusting the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes:

[0022] When the actual condenser outlet temperature is greater than the maximum threshold of the target condenser temperature range, increase the current rotation speed of the outdoor fan;

[0023] Return to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

[0024] Optionally, the step of reducing the current rotation speed of the outdoor fan includes:

[0025] Gradually reduce the current rotation speed of the outdoor fan in an arithmetic progression until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan stops rotating;

[0026] Optionally, the step of increasing the current rotation speed of the outdoor fan includes:

[0027] Arithmetically step up the current speed of the outdoor fan until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan reaches the preset maximum speed.

[0028] In addition, to achieve the above object, the present invention further provides a control device for an outdoor fan of an air conditioner. The control device for the outdoor fan of the air conditioner includes:

[0029] A temperature detection module for obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature;

[0030] A temperature correction module for determining the actual condenser outlet temperature according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature;

[0031] A working condition adjustment module for regulating the speed of the outdoor fan according to the outdoor ambient temperature and the actual condenser outlet temperature.

[0032] In addition, to achieve the above object, the present invention further provides an air conditioner, including a processor, a memory, and a control program for an outdoor fan of the air conditioner stored on the memory and executable by the processor. When the control program for the outdoor fan of the air conditioner is executed by the processor, the steps of the control method for the outdoor fan of the air conditioner as described above are implemented.

[0033] The present invention further provides a computer-readable storage medium, on which a control program for an outdoor fan of the air conditioner is stored. When the control program for the outdoor fan of the air conditioner is executed by a processor, the steps of the control method for the outdoor fan of the air conditioner as described above are implemented.

[0034] In the control method for the outdoor fan of the air conditioner in the technical solution of the present invention, through the steps: obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature; determining the actual condenser outlet temperature according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature; adjusting the speed of the outdoor fan according to the outdoor ambient temperature and the actual condenser outlet temperature. The present invention solves the technical problem that the refrigerant deposition in the outdoor unit of the air conditioner causes poor refrigeration effect of the air conditioner. Corely, the present invention mainly obtains two temperatures, namely the condenser outlet temperature and the refrigerant heat dissipation pipe temperature, and determines whether condenser refrigerant deposition occurs through the comparison of the two temperatures, so as to determine the actual condenser outlet temperature, that is, the true temperature when the refrigerant outputs from the condenser outlet during refrigeration. Furthermore, the influence of refrigerant deposition is excluded, and the speed of the outdoor fan is controlled according to the true condenser outlet temperature, so that it will not cause mis-touch of the over-pressure protection of the air conditioning system after the control feedback of the outdoor fan due to refrigerant deposition, ensuring the refrigeration effect under the condition of refrigerant deposition and improving the comfort experience of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the hardware operating environment of the air conditioner involved in the solution of the embodiment of the present invention;

[0036] Figure 2 It is a schematic flowchart of the first embodiment of the control method of the outdoor fan of the air conditioner of the present invention;

[0037] Figure 3 It is a refined flowchart of step S20 in the first embodiment of the control method of the outdoor fan of the air conditioner of the present invention;

[0038] Figure 4 It is a refined flowchart of step S30 in the first embodiment of the control method of the outdoor fan of the air conditioner of the present invention;

[0039] Figure 5 It is a refined flowchart of step S31 in the first embodiment of the control method of the outdoor fan of the air conditioner of the present invention;

[0040] Figure 6 It is an overall application flowchart of an embodiment of the control method of the outdoor fan of the air conditioner of the present invention;

[0041] Figure 7 It is a schematic structural diagram of the outdoor unit part of the air conditioning system involved in the control method of the outdoor fan of the air conditioner of the present invention;

[0042] Figure 8 It is a schematic framework diagram of the control device of the outdoor fan of the air conditioner of the present invention.

[0043] Explanation of the reference numerals in the drawings:

[0044] Label Name Label Name 1 Outdoor ambient temperature sensor 2 Outdoor condenser 3 Condenser outlet temperature sensor 4 Filter 5 Electronic expansion valve 6 Refrigerant heat dissipation pipe 7 Refrigerant heat dissipation pipe temperature sensor 8 Radiator

[0045] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] General description of the technical solution of the present invention:

[0048] The present invention mainly aims at the phenomenon of refrigerant deposition that easily occurs in the outdoor unit of an air conditioner. By using the condenser outlet temperature sensor and the refrigerant heat dissipation pipe temperature sensor to respectively detect and obtain the condenser outlet temperature and the refrigerant heat dissipation pipe temperature, and comparing the condenser outlet temperature and the refrigerant heat dissipation pipe temperature, the actual condenser outlet temperature that can reflect the true temperature when the refrigerant outputs from the outdoor condenser outlet is determined. Furthermore, based on this actual condenser outlet temperature and the detected outdoor ambient temperature, the outdoor fan is timely and accurately controlled and adjusted, preventing the mis-triggering of the system pressure overprotection caused by the too low detected condenser outlet temperature due to refrigerant deposition, ensuring the refrigeration effect of the air conditioner, and improving the comfort experience of users when using the air conditioner.

[0049] An embodiment of the present invention provides an air conditioner.

[0050] As Figure 1 shown, Figure 1 is a schematic structural diagram of the hardware operating environment of the air conditioner involved in the embodiment of the present invention.

[0051] As Figure 1 shown, the air conditioner may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display (Display) and an input unit such as a control panel. Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WIFI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the foregoing processor 1001. The memory 1005, as a computer storage medium, may include a control program for the outdoor fan of the air conditioner.

[0052] Those skilled in the art can understand that Figure 1 the hardware structure shown in

[0053] Continuing to refer to Figure 1 , Figure 1 the memory 1005, as a computer-readable storage medium, may include an operating system, a user interface module, a network communication module, and a control program for the outdoor fan of the air conditioner.

[0054] In Figure 1Among them, the network communication module is mainly used to connect to the server and communicate data with the server; and the processor 1001 can call the control program of the outdoor fan of the air conditioner stored in the memory 1005 and execute the steps in the following various embodiments.

[0055] Based on the above hardware structure of the controller, various embodiments of the control method for the outdoor fan of the air conditioner according to the present invention are proposed.

[0056] An embodiment of the present invention provides a control method for an outdoor fan of an air conditioner.

[0057] Please refer to Figure 2 , Figure 2 which is a schematic flowchart of the first embodiment of the control method for the outdoor fan of the air conditioner according to the present invention; in the first embodiment of the present invention, the control method includes the following steps:

[0058] Step S10, obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature;

[0059] For the convenience of understanding the condenser outlet temperature and the refrigerant heat dissipation pipe temperature in this embodiment, please refer to Figure 7 , Figure 7 which is a schematic structural diagram of the outdoor unit part of the air conditioning system related to the control method for the outdoor fan of the air conditioner according to the present invention. As Figure 7 shown, for the outdoor unit part of the air conditioning system (air conditioner), it includes an outdoor condenser 2, an electronic expansion valve 5, a filter 4, a refrigerant heat dissipation pipe 6, and a radiator 8. At the same time, an outdoor ambient temperature sensor 1 is provided at the upper left part of the outdoor condenser 2 for detecting the outdoor ambient temperature T4. In addition, the outdoor ambient temperature sensor 1 can also be provided at other positions. A condenser outlet temperature sensor 3 is provided at the outlet position of the outdoor condenser 2 for detecting and obtaining the outlet temperature T3 of the outdoor condenser 2, which is essentially the refrigerant temperature when the refrigerant exits from the outlet of the outdoor condenser 2. A refrigerant heat dissipation pipe temperature sensor 7 is provided on the refrigerant heat dissipation pipe 6 for detecting and obtaining the temperature TL of the refrigerant heat dissipation pipe 6. It should be noted that Figure 7 is only an example for the convenience of understanding the positional relationship of each structural component and is not a limitation on the air conditioner structure.

[0060] Based on the above air conditioner structure, the condenser outlet temperature of the outdoor condenser 2 is obtained through the condenser outlet temperature sensor 3. At the same time, the temperature of the refrigerant heat dissipation pipe 6 can also be obtained through the refrigerant heat dissipation pipe temperature sensor 7, and the outdoor ambient temperature outside can be obtained through the outdoor ambient temperature sensor 1.

[0061] Step S20, determining the actual condenser outlet temperature according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature;

[0062] When the condenser outlet temperature and the refrigerant heat dissipation pipe temperature are obtained, the detected temperatures are transmitted to the main controller of the outdoor unit through the corresponding temperature sensors. The main controller compares the condenser outlet temperature with the refrigerant heat dissipation pipe temperature in terms of numerical value, so as to determine whether refrigerant precipitation has occurred in the condenser of the current outdoor unit. When refrigerant precipitation occurs, the refrigerant heat dissipation pipe temperature is used as the actual condenser outlet temperature to control the outdoor fan. When refrigerant precipitation has not occurred, the condenser outlet temperature is used as the actual condenser outlet temperature to control the outdoor fan.

[0063] To facilitate the understanding of the technical principle of the present invention regarding the phenomenon of refrigerant deposition, it should be supplemented that when refrigerant precipitation occurs in the outdoor condenser, a large amount of refrigerant deposits on the bottom outlet side of the condenser, making the change of the condenser outlet temperature prone to lag or distortion, and further resulting in the inability to effectively control the actual fan. For example, when the set temperature in the room is increased according to the original set temperature, normally, the condenser outlet temperature corresponding to the original set temperature is lower (compared with the set temperature after the increase), and the condenser outlet temperature corresponding to the set temperature after the increase is higher. Once refrigerant deposition occurs, even if the set temperature is increased, the condenser temperature detected by the condenser outlet temperature sensor is still low due to refrigerant deposition. At this time, it is very likely to consider that the outlet pressure and operating frequency of the compressor are too high, and then the compressor is frequency-reduced due to overpressure protection, resulting in a deterioration of the refrigeration effect.

[0064] Please refer to Figure 3 , in an embodiment, the step S20 includes:

[0065] Step S21, obtaining a first difference between the refrigerant heat dissipation pipe temperature and the condenser outlet temperature;

[0066] Step S22, when the first difference is greater than or equal to a first temperature threshold, determining the refrigerant heat dissipation pipe temperature as the actual condenser outlet temperature;

[0067] Step S23, when the first difference is less than the first temperature threshold, determining the condenser outlet temperature as the actual condenser outlet temperature.

[0068] In this embodiment, the main controller of the outdoor unit can calculate a first difference T1 between the refrigerant heat dissipation pipe temperature TL and the condenser outlet temperature T3, that is, TL - T3 = T1.

[0069] The first temperature threshold D among them can be set according to the characteristics of different air conditioners, such as 5°C, which is not limited here. It mainly reflects the tolerance of the temperature difference between the refrigerant heat dissipation pipe temperature and the condenser outlet temperature. When it is less than the first temperature threshold, it indicates that there is no refrigerant deposition or the refrigerant deposition phenomenon is relatively slight and does not affect the control of the outdoor fan. However, if it is greater than or equal to the first temperature threshold, it means that refrigerant deposition has occurred and the refrigerant deposition has seriously affected the control of the outdoor fan. Moreover, the greater the temperature exceeding the first temperature threshold D by the first difference T1, the more serious the refrigerant deposition phenomenon is.

[0070] When the first difference is greater than or equal to the first temperature threshold, that is, TL - T3 ≥ D, it indicates that refrigerant deposition has occurred and the refrigerant deposition affects the control of the outdoor fan. At this time, the condenser outlet temperature detected by the condenser outlet temperature sensor cannot truly reflect the real temperature of the refrigerant when it comes out of the entire condenser. Then, the condenser heat dissipation pipe temperature detected by the condenser heat dissipation pipe temperature sensor needs to be used as the actual condenser outlet temperature to control and adjust the outdoor fan. This condenser heat dissipation pipe temperature is not affected by refrigerant deposition and reflects the real refrigerant temperature on the outlet side of the condenser, thus avoiding the lag in the control and adjustment of the outdoor fan and ensuring the refrigeration effect of the air conditioner by timely controlling and adjusting the outdoor fan.

[0071] When the first difference is less than the first temperature threshold, that is, TL - T3 < D, it indicates that there is no refrigerant deposition or there is slight refrigerant deposition but it does not affect the control of the outdoor fan. At this time, the condenser outlet temperature detected by the condenser outlet temperature sensor can be used as the actual condenser outlet temperature. In this way, when there is no refrigerant deposition or there is slight refrigerant deposition, it can most accurately reflect the real temperature of the refrigerant when it exits, so as to accurately control and adjust the outdoor fan according to the actual real refrigerant temperature to achieve the best refrigeration effect under the current working conditions.

[0072] Step S30: Adjust the rotation speed of the outdoor fan according to the outdoor ambient temperature and the actual condenser outlet temperature.

[0073] In this embodiment, the rotation speed of the outdoor fan is mainly related to the current outdoor ambient temperature and the condenser outlet temperature. After determining the actual condenser outlet temperature, the rotation speed of the outdoor fan is increased, decreased, or maintained, etc., through the outdoor ambient temperature and the actual condenser outlet temperature.

[0074] Please refer to Figure 4 , in an embodiment, step S30 includes:

[0075] Step S31: Determine the target condenser temperature range according to the outdoor ambient temperature;

[0076] Step S32, adjust the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature.

[0077] In this embodiment, the target condenser temperature range T3_target ∈ [X, X + X1], and this target condenser temperature range represents the range where the rotation speed of the outdoor fan does not need to be regulated. When the actual condenser outlet temperature is within this range, the rotation speed of the outdoor fan does not need to be regulated, and when the actual condenser outlet temperature is not within this target condenser temperature range, the rotation speed of the outdoor fan needs to be adjusted so that the actual condenser outlet temperature is maintained within this target condenser temperature range.

[0078] The target condenser temperature range T3_target is related to the outdoor ambient temperature and varies with the change of the outdoor ambient temperature. The target condenser temperature range T3_target is determined by comparing the outdoor ambient temperature with a plurality of preset temperature values according to a certain rule.

[0079] When the target condenser temperature range and the actual condenser outlet temperature are determined, the rotation speed of the outdoor fan can be adjusted so that the actual condenser outlet temperature is within the target condenser temperature range. Only within this target condenser temperature range can the compressor step down when actually needed and step up when actually needed, thereby maintaining the stability of the system pressure, and also avoiding the mis-triggering of the system high-pressure protection that is prone to occur when the refrigerant deposits, ensuring the comfort of users when the air conditioner is cooling.

[0080] Please refer to Figure 5 , in an embodiment, the step S31 of determining the target condenser temperature range according to the outdoor ambient temperature includes:

[0081] Step S310, obtain the outdoor ambient temperature, and determine the first preset temperature, the second preset temperature, and the third preset temperature corresponding to the outdoor ambient temperature, where the third preset temperature is greater than the second preset temperature which is greater than the first preset temperature;

[0082] Step S311, add the first preset temperature and the outdoor ambient temperature to calculate and obtain the corrected outdoor ambient temperature;

[0083] Step S312, determine the maximum temperature between the corrected outdoor ambient temperature and the second preset temperature, and determine the minimum temperature between the maximum temperature and the third preset temperature;

[0084] Step S313, use the minimum temperature as the minimum value of the target condenser temperature range, and use the sum value between the minimum temperature and the fourth preset temperature as the maximum value of the target condenser temperature range.

[0085] In this embodiment, the first preset temperature A, the second preset temperature B, and the third preset temperature C can all be set according to actual needs, which are mainly related to the specific refrigerant and the specific air-conditioning system. However, it is necessary to ensure that the third preset temperature C is greater than the second preset temperature B which is greater than the first preset temperature A. For example, the first preset temperature A can be 20 °C, the second preset temperature B can be 28 °C, and the third preset temperature C can be 36 °C.

[0086] To facilitate the understanding of each process in this embodiment, mathematical symbols can be used for assistance. The minimum threshold X in the target condenser temperature range T3_target ∈ [X, X + X1] is set as: X = min(max(T4 + A, B), C), that is, first add the first preset temperature A to the outdoor ambient temperature T4 to obtain the corrected outdoor ambient temperature T4 + A, then compare T4 + A with the second preset temperature B to determine the maximum value between the two, and compare the determined maximum value with the third preset temperature C to determine the minimum value between the two. Take this minimum value as the minimum threshold X of the target condenser temperature range T3_target, and then determine the maximum threshold of the target condenser temperature range T3_target as X + X1 according to the fourth preset temperature, where X1 can be set according to actual needs, such as 3 °C, and there is no limitation here. To more clearly understand X = min(max(T4 + A, B), C), in one example, X can be expressed as X = min(max(T4 + 20, 28), 36). Assuming T4 is 10 °C, then X = 30 °C. The purpose of such a design is to ensure that the temperature at which the refrigerant flows out of the outdoor condenser can reach the refrigerant temperature required to adjust the indoor environment temperature for cooling the indoor area, achieving the desired refrigeration effect of the user and improving the comfort of the indoor environment.

[0087] The control method of the outdoor fan of the air conditioner in the technical solution of the present invention includes the steps of: obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature; determining the actual condenser outlet temperature according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature; and adjusting the rotation speed of the outdoor fan according to the outdoor ambient temperature and the actual condenser outlet temperature. The present invention solves the technical problem that the refrigerant deposition in the outdoor unit of the air conditioner leads to poor refrigeration effect of the air conditioner. Corely, the present invention mainly obtains the condenser outlet temperature and the refrigerant heat dissipation pipe temperature, determines whether condenser refrigerant deposition occurs through the comparison of the two temperatures, thereby determining the actual condenser outlet temperature, that is, the true temperature when the refrigerant outputs from the condenser outlet during refrigeration, and then excludes the influence of refrigerant deposition and controls the rotation speed of the outdoor fan according to the true condenser outlet temperature, so as to avoid mis-touching the over-pressure protection of the air-conditioning system after the control feedback of the outdoor fan due to refrigerant deposition, ensure the refrigeration effect under the condition of refrigerant deposition, and improve the comfort experience of the user.

[0088] Furthermore, based on the first embodiment of the control method for the outdoor fan of the air conditioner according to the present invention, a second embodiment of the control method for the outdoor fan of the air conditioner according to the present invention is proposed. In this embodiment, step S32 of adjusting the rotational speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes:

[0089] Step a: When the actual condenser outlet temperature is within the target condenser temperature range, maintain the current rotational speed of the outdoor fan;

[0090] Step b: Return to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

[0091] In this embodiment, if the actual condenser outlet temperature T3' is within the target condenser temperature range, that is, X ≤ T3' ≤ X + X1, it indicates that the temperature of the refrigerant passing through the condenser has reached the refrigeration requirement. Therefore, the rotational speed Pr of the outdoor fan can be maintained unchanged, and then return to continue detecting and obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature at a certain period. Then, it is determined whether refrigerant deposition occurs in the outdoor condenser according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature. When refrigerant deposition occurs, the refrigerant heat dissipation pipe temperature is used as the actual condenser outlet temperature. When refrigerant deposition does not occur, the condenser outlet temperature is used as the actual condenser outlet temperature, and then the control of the rotational speed of the outdoor fan continues in the next round.

[0092] In one embodiment, step S32 of adjusting the rotational speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes:

[0093] Step c: When the actual condenser outlet temperature is less than the minimum threshold of the target condenser temperature range, reduce the...

[0094] Step d: Return to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

[0095] When the actual condenser outlet temperature is less than the minimum threshold of the target condenser temperature range, that is, T3' < X, in order to prevent problems such as condensation, at this time, it is necessary to adjust T3' to X ≤ T3' ≤ X + X1, that is, increase the actual condenser outlet temperature. When refrigerant deposition does not occur, that is, increase the condenser outlet temperature. When refrigerant deposition occurs, that is, increase the refrigerant heat dissipation pipe temperature. In order to increase the actual condenser outlet temperature T3', it is necessary to reduce the rotational speed of the outdoor fan, so that the heat exchange amount between the refrigerant and the outside world is no longer so large, thereby increasing the actual condenser outlet temperature. After adjusting the actual condenser outlet temperature, return to continue the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature, which will not be elaborated here.

[0096] In one embodiment, step c of reducing the current speed of the outdoor fan includes:

[0097] Arithmetically and stepwise reducing the current speed of the outdoor fan until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan stops rotating

[0098] To ensure the stability of the system during the adjustment of the outdoor fan, the current speed of the outdoor fan can be reduced in an arithmetically stepped manner until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan stops rotating. For example, if the difference value is P and the current speed is Pr, then the above process can be expressed as Pr = Pr - P, that is, each time the outdoor fan is adjusted, the speed is reduced by P, and the minimum current speed can be turned off to 0, that is, the outdoor fan stops rotating.

[0099] In one embodiment, step S32 of adjusting the speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes:

[0100] Step e, when the actual condenser outlet temperature is greater than the maximum threshold of the target condenser temperature range, increasing the current speed of the outdoor fan;

[0101] Step f, returning to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

[0102] When the actual condenser outlet temperature is greater than the maximum threshold of the target condenser temperature range, that is, T3' > X + X1, to prevent the refrigerant temperature from being too high to exchange heat or a large reduction in the heat exchange amount resulting in a poor refrigeration effect, at this time, T3' needs to be adjusted to X ≤ T3' ≤ X + X1, that is, the actual condenser outlet temperature needs to be reduced. When there is no refrigerant deposition, that is, reducing the condenser outlet temperature; when there is refrigerant deposition, that is, reducing the refrigerant heat dissipation pipe temperature. To increase the actual condenser outlet temperature T3', the speed of the outdoor fan needs to be increased, so as to increase the heat exchange amount between the refrigerant and the outside world to reduce the actual condenser outlet temperature. After adjusting the actual condenser outlet temperature, return to continue the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature, which will not be elaborated here.

[0103] In one embodiment, step e of increasing the current speed of the outdoor fan includes:

[0104] Arithmetically and stepwise increasing the current speed of the outdoor fan until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan reaches the preset maximum speed

[0105] To ensure the stability of the system during the adjustment of the outdoor fan, the current speed of the outdoor fan can be increased in an arithmetic progression ladder-like manner until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan reaches the maximum speed under the current working condition. For example, if the common difference is P and the current speed is Pr, the above process can be expressed as Pr = Pr + P, that is, each time the outdoor fan is adjusted, the speed will increase by P, and the maximum current speed can reach the maximum allowable speed Pr_max.

[0106] To further understand the implementation process of the above embodiments, the above embodiments can be combined as a whole technical solution of the present invention. To understand the present invention more clearly, please refer to Figure 6 , Figure 6 which is a schematic diagram of the overall comprehensive process of an embodiment of the control method for the outdoor fan of the air conditioner of the present invention.

[0107] 1. In the refrigeration mode, various parameters of the outdoor unit are detected, including the condenser outlet temperature T3 of the outdoor unit, the refrigerant heat dissipation pipe temperature TL, the outdoor ambient temperature T4, and the outdoor unit fan speed (current speed) Pr.

[0108] 2. Compare the difference between T3 and TL - D to determine whether the distortion of T3 is caused by the influence of refrigerant deposition, and determine the value of T3 assigned to actually control the air damper, that is, determine whether the actual T3' is T3 or TL.

[0109] 3. The T3 target value T3_target is associated with T4, and the target T3_target ∈ [X, X + X1], where X = min(max(T4 + A, B), C).

[0110] 4. The current speed Pr of the outdoor fan is adaptively adjusted (maintained, increased, or decreased) according to the target T3_target.

[0111] In addition, the present invention also provides a control device for the outdoor fan of an air conditioner. Please refer to Figure 8 , and the control device for the outdoor fan of the air conditioner includes:

[0112] A temperature detection module A10 for obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature;

[0113] A temperature correction module A20 for determining the actual condenser outlet temperature according to the condenser outlet temperature and the refrigerant heat dissipation pipe temperature;

[0114] A working condition adjustment module A30 for regulating the speed of the outdoor fan according to the outdoor ambient temperature and the actual condenser outlet temperature.

[0115] Optionally, the temperature correction module A20 is further configured to:

[0116] Obtain a first difference between the temperature of the refrigerant heat dissipation pipe and the temperature at the outlet of the condenser;

[0117] When the first difference is greater than or equal to a first temperature threshold, determine the temperature of the refrigerant heat dissipation pipe as the actual temperature at the outlet of the condenser;

[0118] When the first difference is less than the first temperature threshold, determine the temperature at the outlet of the condenser as the actual temperature at the outlet of the condenser.

[0119] Optionally, the operating condition adjustment module A30 is further configured to:

[0120] Determine a target condenser temperature range according to the outdoor ambient temperature;

[0121] Adjust the rotational speed of the outdoor fan according to the target condenser temperature range and the actual temperature at the outlet of the condenser.

[0122] Optionally, the operating condition adjustment module A30 is further configured to:

[0123] When the actual temperature at the outlet of the condenser is within the target condenser temperature range, maintain the current rotational speed of the outdoor fan;

[0124] Return to execute the step of obtaining the temperature at the outlet of the condenser and the temperature of the refrigerant heat dissipation pipe.

[0125] Optionally, the operating condition adjustment module A30 is further configured to:

[0126] When the actual temperature at the outlet of the condenser is less than the minimum threshold of the target condenser temperature range, reduce the current rotational speed of the outdoor fan;

[0127] Return to execute the step of obtaining the temperature at the outlet of the condenser and the temperature of the refrigerant heat dissipation pipe.

[0128] Optionally, the operating condition adjustment module A30 is further configured to:

[0129] When the actual temperature at the outlet of the condenser is greater than the maximum threshold of the target condenser temperature range, increase the current rotational speed of the outdoor fan;

[0130] Return to execute the step of obtaining the temperature at the outlet of the condenser and the temperature of the refrigerant heat dissipation pipe.

[0131] Optionally, the operating condition adjustment module A30 is further configured to:

[0132] Gradually reduce the current rotational speed of the outdoor fan in an arithmetic progression until the actual temperature at the outlet of the condenser is within the target condenser temperature range or the outdoor fan stops rotating;

[0133] Optionally, the operating condition adjustment module A30 is further configured to:

[0134] Incrementally step up the current rotational speed of the outdoor fan in an arithmetic progression until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan reaches the preset maximum rotational speed.

[0135] The specific implementation manner of the control device for the outdoor fan of the air conditioner in the present invention is basically the same as that of each embodiment of the control method for the outdoor fan of the air conditioner described above, and will not be elaborated here.

[0136] In addition, the present invention also provides a computer-readable storage medium. A control program for the outdoor fan of the air conditioner is stored on the computer-readable storage medium of the present invention. When the control program for the outdoor fan of the air conditioner is executed by a processor, the steps of the control method for the outdoor fan of the air conditioner as described above are implemented.

[0137] Among them, the method implemented when the control program for the outdoor fan of the air conditioner is executed can refer to each embodiment of the control method for the outdoor fan of the air conditioner in the present invention, and will not be elaborated here.

[0138] Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0139] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more flows or multiple flows and / or blocks Figure 1 one or more blocks or multiple blocks.

[0140] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions in the process Figure 1one process or multiple processes and / or blocks Figure 1 the functions specified in one block or multiple blocks.

[0141] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 the steps of the functions specified in one block or multiple blocks.

[0142] It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim listing several devices, several of these devices can be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names.

[0143] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0144] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A control method for an outdoor fan of an air conditioner, characterized in that, the control method includes the following steps: Obtain the condenser outlet temperature and the refrigerant heat dissipation pipe temperature; Obtain a first difference between the refrigerant heat dissipation pipe temperature and the condenser outlet temperature; When the first difference is greater than or equal to a first temperature threshold, determine the refrigerant heat dissipation pipe temperature as the actual condenser outlet temperature; When the first difference is less than the first temperature threshold, determine the condenser outlet temperature as the actual condenser outlet temperature; Determine a target condenser temperature range according to the outdoor ambient temperature; Adjust the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature; The determining the target condenser temperature range according to the outdoor ambient temperature includes: Step S310, obtain the outdoor ambient temperature, and determine a first preset temperature, a second preset temperature, and a third preset temperature corresponding to the outdoor ambient temperature, where the third preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the first preset temperature; Step S311, add the first preset temperature and the outdoor ambient temperature to calculate a corrected outdoor ambient temperature; Step S312, determine the maximum temperature between the corrected outdoor ambient temperature and the second preset temperature, and determine the minimum temperature between the maximum temperature and the third preset temperature; Step S313, use the minimum temperature as the minimum value of the target condenser temperature range, and use the sum value between the minimum temperature and a fourth preset temperature as the maximum value of the target condenser temperature range.

2. The control method for an outdoor fan of an air conditioner according to claim 1, characterized in that, the step of adjusting the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes: When the actual condenser outlet temperature is within the target condenser temperature range, maintain the current rotation speed of the outdoor fan; Return to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

3. The control method for an outdoor fan of an air conditioner according to claim 1, characterized in that, the step of adjusting the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes: When the actual condenser outlet temperature is less than the minimum threshold of the target condenser temperature range, reduce the current rotation speed of the outdoor fan; Return to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

4. The control method for an outdoor fan of an air conditioner according to claim 3, characterized in that, the step of adjusting the rotation speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature includes: When the actual condenser outlet temperature is greater than the maximum threshold of the target condenser temperature range, increase the current rotation speed of the outdoor fan; Return to execute the step of obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature.

5. The control method for an outdoor fan of an air conditioner according to claim 4, characterized in that, The step of reducing the current speed of the outdoor fan includes: Reducing the current speed of the outdoor fan in an arithmetic progression stepwise until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan stops rotating; The step of increasing the current speed of the outdoor fan includes: Increasing the current speed of the outdoor fan in an arithmetic progression stepwise until the actual condenser outlet temperature is within the target condenser temperature range or the outdoor fan reaches the preset maximum speed.

6. A control device for an outdoor fan of an air conditioner, characterized in that the control device for the outdoor fan of the air conditioner includes: a temperature detection module for obtaining the condenser outlet temperature and the refrigerant heat dissipation pipe temperature; a temperature correction module for obtaining a first difference between the refrigerant heat dissipation pipe temperature and the condenser outlet temperature; when the first difference is greater than or equal to a first temperature threshold, determining the refrigerant heat dissipation pipe temperature as the actual condenser outlet temperature; when the first difference is less than the first temperature threshold, determining the condenser outlet temperature as the actual condenser outlet temperature; a working condition adjustment module for obtaining the outdoor ambient temperature and determining a first preset temperature, a second preset temperature, and a third preset temperature corresponding to the outdoor ambient temperature, wherein the third preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the first preset temperature; adding the first preset temperature and the outdoor ambient temperature to calculate a corrected outdoor ambient temperature; determining the maximum temperature between the corrected outdoor ambient temperature and the second preset temperature, and determining the minimum temperature between the maximum temperature and the third preset temperature; using the minimum temperature as the minimum value of the target condenser temperature range, and using the sum value between the minimum temperature and a fourth preset temperature as the maximum value of the target condenser temperature range; adjusting the speed of the outdoor fan according to the target condenser temperature range and the actual condenser outlet temperature.

7. An air conditioner, characterized in that the air conditioner includes a processor, a memory, and a control program for an outdoor fan of the air conditioner stored on the memory and executable by the processor, wherein when the control program for the outdoor fan of the air conditioner is executed by the processor, the steps of the control method for the outdoor fan of the air conditioner according to any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium, characterized in that a control program for an outdoor fan of the air conditioner is stored on the computer-readable storage medium, wherein when the control program for the outdoor fan of the air conditioner is executed by a processor, the steps of the control method for the outdoor fan of the air conditioner according to any one of claims 1 to 5 are implemented.

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