Air source heat pump unit control methods, devices, storage media and electronic equipment

Abstract

This application discloses a control method, device, storage medium, and electronic equipment for an air source heat pump unit, relating to the field of heat pump technology. The method includes: when the air source heat pump unit meets low-temperature cooling conditions, controlling the outdoor fan to rotate forward when the base point temperature is greater than or equal to a preset first temperature, and controlling the outdoor fan to stop when the base point temperature is less than or equal to a preset second temperature; when the number of outdoor fan stops reflects that the air source heat pump unit is in an oscillating state, and the base point temperature is greater than or equal to a preset third temperature, controlling the outdoor fan to reverse at an initial reverse speed for a preset first duration; the initial reverse speed is determined based on the outdoor ambient temperature, and at the same outdoor ambient temperature, reverse rotation of the outdoor fan provides a lower airflow than forward rotation; the base point temperature is determined based on at least one of the condensing temperature and the outdoor coil temperature. This application can effectively improve the reliability of air source heat pump units under low-temperature cooling conditions.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, specifically to a control method, device, storage medium, and electronic equipment for an air source heat pump unit. Background Technology

[0002] Traditional air source heat pump units typically rely on fixed speed curves or PID feedback of condensing pressure / condensing temperature for outdoor fan control strategies. These traditional outdoor fan control strategies perform reasonably well under normal cooling conditions, but under low-temperature cooling conditions, they are prone to a series of low reliability problems such as frequent fan start-stop, high risk of compressor liquid return, and low-pressure side pressure runaway leading to ice blockage and liquid slugging. Summary of the Invention

[0003] This application provides a control scheme for an air source heat pump unit, which can effectively improve the reliability of the air source heat pump unit under low temperature cooling conditions.

[0004] The embodiments of this application provide the following technical solutions: According to one embodiment of this application, a control method for an air source heat pump unit includes: when the air source heat pump unit meets the low-temperature cooling condition, controlling the outdoor fan to rotate forward when the base point temperature is greater than or equal to a preset first temperature, and controlling the outdoor fan to stop when the base point temperature is less than or equal to a preset second temperature; when the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillation state, and the base point temperature is greater than or equal to a preset third temperature, controlling the outdoor fan to reverse at an initial reverse rotation speed for a preset first duration; wherein, the initial reverse rotation speed is determined based on the outdoor ambient temperature, and at the same outdoor ambient temperature, the outdoor fan reversal provides a lower air volume than the outdoor fan rotation forward, and the base point temperature is determined based on at least one of the condensing temperature and the outdoor coil temperature.

[0005] In some embodiments of this application, controlling the outdoor fan to rotate forward when the base point temperature is greater than or equal to a preset first temperature includes: determining an initial forward rotation speed based on the outdoor ambient temperature when the base point temperature is greater than or equal to the preset first temperature; controlling the outdoor fan to rotate forward at the initial forward rotation speed for a preset second duration; after the outdoor fan continues to rotate forward at the initial forward rotation speed for the preset second duration, determining a forward rotation adjustment action based on the base point temperature; and adjusting the forward rotation speed of the outdoor fan according to the forward rotation adjustment action.

[0006] In some embodiments of this application, determining the forward rotation adjustment action based on the base point temperature includes: if the base point temperature is within a first range and remains within a predetermined time, the forward rotation adjustment action is to stop the outdoor fan; if the base point temperature is within a second range, the forward rotation adjustment action is to adjust the outdoor fan to a preset minimum forward rotation speed at a first decreasing rate; if the base point temperature is within a third range, the forward rotation adjustment action is to adjust the outdoor fan to the preset minimum forward rotation speed at a second decreasing rate; if the base point temperature is within a fourth range, the forward rotation adjustment action is to maintain the forward rotation speed of the outdoor fan; if the base point temperature is within a fifth range, the forward rotation adjustment action is to adjust the outdoor fan to a preset maximum forward rotation speed at a preset increasing rate; if the base point temperature is within a sixth range, the forward rotation adjustment action is to immediately adjust the outdoor fan to the preset maximum forward rotation speed; wherein, the first range to the sixth range increase sequentially.

[0007] In some embodiments of this application, after controlling the external fan to reverse at an initial reverse speed for a preset first time, the method further includes: after the external fan continues to reverse at the initial reverse speed for the preset first time, determining a reverse adjustment action based on the base point temperature; and adjusting the reverse speed of the external fan according to the reverse adjustment action.

[0008] In some embodiments of this application, determining the reversing adjustment action based on the base point temperature includes: if the base point temperature is within a first range and remains within a predetermined time, the reversing adjustment action is to stop the outdoor fan; if the base point temperature is within a second range, the reversing adjustment action is to adjust the outdoor fan to a preset minimum reversing speed at a first decreasing rate; if the base point temperature is within a third range, the reversing adjustment action is to adjust the outdoor fan to the preset minimum reversing speed at a second decreasing rate; if the base point temperature is within a fourth range, the reversing adjustment action is to maintain the reversing speed of the outdoor fan; if the base point temperature is within a fifth range, the reversing adjustment action is to adjust the outdoor fan to a preset maximum reversing speed at a preset increasing rate; if the base point temperature is within a sixth range, the reversing adjustment action is to immediately adjust the outdoor fan to the preset maximum reversing speed; wherein, the first range to the sixth range increase sequentially.

[0009] In some embodiments of this application, after controlling the outdoor fan to reverse at an initial reverse speed for a preset first time, the method further includes: if the reverse speed of the outdoor fan is increased to a preset maximum reverse speed, then controlling the outdoor fan to stop reversing; or, if the high-pressure protection switch of the air source heat pump unit is triggered, then controlling the outdoor fan to stop reversing.

[0010] In some embodiments of this application, after controlling the external fan to stop reversing, the method further includes: after the external fan stops reversing, if the base point temperature is greater than or equal to the preset first temperature, controlling the external fan to rotate forward; if the base point temperature is less than or equal to the preset second temperature, controlling the external fan to stop; and restarting the monitoring of the number of times the external fan stops.

[0011] According to one embodiment of this application, an air source heat pump unit control device includes: a forward rotation control module, configured to: control the outdoor fan to rotate forward when the air source heat pump unit meets the low-temperature cooling condition and the base point temperature is greater than or equal to a preset first temperature, and control the outdoor fan to stop when the base point temperature is less than or equal to a preset second temperature; and a reverse rotation control module, configured to: control the outdoor fan to reverse at an initial reverse rotation speed for a preset first duration when the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillation state, and the base point temperature is greater than or equal to a preset third temperature; wherein the initial reverse rotation speed is determined based on the outdoor ambient temperature, and at the same outdoor ambient temperature, the reverse rotation of the outdoor fan provides a lower air volume than the forward rotation of the outdoor fan, and the base point temperature is determined based on at least one of the condensing temperature and the outdoor coil temperature.

[0012] According to another embodiment of this application, a storage medium stores a computer program thereon, which, when executed by a processor of an electronic device, causes the electronic device to perform the methods described in the embodiments of this application.

[0013] According to another embodiment of this application, an electronic device may include: a memory storing a computer program; and a processor reading the computer program stored in the memory to execute the methods described in the embodiments of this application.

[0014] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0015] In this embodiment, when the air source heat pump unit meets the low-temperature cooling condition, the outdoor fan is controlled to rotate forward when the base point temperature is greater than or equal to a preset first temperature, and the outdoor fan is controlled to stop when the base point temperature is less than or equal to a preset second temperature. When the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillation state, and the base point temperature is greater than or equal to a preset third temperature, the outdoor fan is controlled to reverse at an initial reverse speed for a preset first duration. The initial reverse speed is determined based on the outdoor ambient temperature, and at the same outdoor ambient temperature, the outdoor fan provides a lower air volume when rotating in reverse compared to rotating forward. The base point temperature is determined based on at least one of the condensing temperature and the outdoor coil temperature.

[0016] In this embodiment of the application, under low-temperature cooling conditions, when the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillating state and the base temperature is greater than or equal to a preset third temperature, the outdoor ambient temperature determines the initial reverse rotation speed, and the outdoor fan is controlled to reverse at this initial reverse rotation speed for a preset first duration. Furthermore, at the same outdoor ambient temperature, the outdoor fan reversing provides a lower airflow compared to forward rotation, allowing the airflow of the outdoor fan to be stably and accurately matched with excellent heat exchange performance. This avoids drastic fluctuations in condensing pressure near the set value, effectively preventing the outdoor fan from cyclically starting and stopping, and further avoiding a series of low-reliability problems such as high compressor liquid return risk, low-pressure side pressure runaway leading to ice blockage and liquid slugging. Therefore, the overall reliability of the air source heat pump unit under low-temperature cooling conditions is effectively improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart of an air source heat pump unit control method according to an embodiment of this application is shown.

[0019] Figure 2 A system architecture diagram of an air source heat pump unit according to an embodiment of this application is shown.

[0020] Figure 3 A flowchart of a frequency converter control according to an embodiment of this application is shown.

[0021] Figure 4 A flowchart of frequency converter control according to another embodiment of this application is shown.

[0022] Figure 5A block diagram of an air source heat pump unit control device according to an embodiment of this application is shown.

[0023] Figure 6 A block diagram of an electronic device according to an embodiment of this application is shown. Detailed Implementation

[0024] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments provided herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure. Furthermore, the embodiments provided below are some embodiments for implementing the present disclosure, and not all embodiments for implementing the present disclosure. Unless otherwise specified, the technical solutions described in the embodiments of the present disclosure can be implemented in any combination.

[0025] It should be noted that, in the embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method or apparatus that includes a list of elements includes not only the elements expressly described, but also other elements not expressly listed, or elements inherent to implementing the method or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other related elements (e.g., steps in the method or units in the apparatus; for example, a unit may be a portion of circuitry, a portion of a processor, a portion of a program or software, etc.) in the method or apparatus that includes that element.

[0026] For example, the air source heat pump unit control method provided in this disclosure includes a series of steps, but the air source heat pump unit control method provided in this disclosure is not limited to the steps described. Similarly, the air source heat pump unit control device provided in this disclosure includes a series of units, but the device provided in this disclosure is not limited to the units explicitly described, but may also include units that need to be set up to obtain relevant information or to process information.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure.

[0028] It is understood that in the specific implementation of this application, relevant data is involved. When the embodiments in this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0029] Traditional air source heat pump units typically rely on fixed speed curves or PID feedback of condensing pressure / condensing temperature for outdoor fan control strategies. These traditional outdoor fan control strategies perform reasonably well under normal cooling conditions (such as when the outdoor ambient temperature is greater than 15°C), but under low-temperature cooling conditions (such as when the outdoor ambient temperature is less than or equal to 15°C), they are prone to a series of low reliability problems, such as frequent fan start-stop, high risk of compressor liquid return, and low-pressure side pressure runaway leading to ice blockage and liquid slugging.

[0030] Under low-temperature cooling conditions, the temperature difference between the outdoor heat exchanger and the outdoor environment is extremely large, resulting in extremely high heat exchange efficiency. In response, traditional PID feedback control strategies for the outdoor fan (condensing pressure / temperature) dynamically adjust the fan speed (for DC brushless fans) or start / stop (for AC fans) when the condensing pressure / temperature slightly exceeds the set value, aiming to stabilize the condensing pressure / temperature near the set value. However, due to the excellent heat exchange, once the outdoor fan stops, the condensing pressure drops rapidly, triggering the fan to start again. This cycle of starting and stopping the fan repeatedly causes frequent start-stop cycles. These frequent fan starts and stops significantly reduce the lifespan of the motor and starting capacitor, and also cause drastic fluctuations in system pressure, affecting the overall reliability of the air source heat pump unit.

[0031] Furthermore, intermittent refrigerant return to the compressor can occur: During the instant the outdoor fan starts or operates at high speed, the extremely strong condensing effect causes the refrigerant to liquefy rapidly. The condensate may not have enough time to fully subcool in the large condenser piping, potentially flooding part of the heat exchange tubes and causing liquid refrigerant to surge back into the compressor as a liquid hammer. This liquid return dilutes the lubricating oil, leading to liquid slugging, poor compressor lubrication, increased wear, and even direct compressor seizure and damage. Additionally, it can cause low-pressure side pressure runaway and ice blockage risks: This is a cascading systemic risk caused by frequent start-stop of the outdoor fan. The high and low pressure sides of the system are linked; when the outdoor fan stops, causing a sudden drop in condensing pressure (high pressure), the compressor suction pressure (low pressure) will also drop synchronously, causing instability. This further leads to compressor liquid slugging or overheating, as well as system oscillation and instability.

[0032] To address these issues, this application provides a control scheme for an air source heat pump unit, which can effectively improve the reliability of the air source heat pump unit under low-temperature cooling conditions.

[0033] The following is a detailed description of relevant embodiments of the air source heat pump unit control scheme provided in this application.

[0034] Figure 1A flowchart illustrating an embodiment of an air source heat pump unit control method according to this application is shown. The execution entity of this air source heat pump unit control method can be an electronic device or a server. The electronic device can be the air source heat pump unit itself, a remote control, a wired controller, a mobile phone, a computer, a smartwatch, or other home appliances, etc., and the server can be a cloud server or a physical server, etc.

[0035] For example, in one embodiment of this application, the air source heat pump unit itself can be the executing entity of the air source heat pump unit control method. The air source heat pump unit may include a processor and a memory, and the memory stores a computer program. Thus, the processor in the air source heat pump unit can read the computer program stored in the memory to execute the methods of the various embodiments of this application.

[0036] In addition, see Figure 2 ,like Figure 2 The schematic diagram illustrates a system architecture of an example air source heat pump unit according to this application. The air source heat pump unit may include at least a compressor 210, a gas-liquid separator 220, a four-way valve 230, a water-side heat exchanger 240, an outdoor heat exchanger (i.e., an air-side heat exchanger) 250, an electronic expansion valve 260, and an outdoor fan 270. A low-pressure sensor 280 can be installed on the connecting pipe between the suction end of the compressor 210 and the gas-liquid separator 220. The gas-liquid separator 220 is connected to the first end (S-tube) of the four-way valve 230, and the discharge end of the compressor 210 is connected to the second end (D-tube) of the four-way valve 230. The third end (C-tube) of the four-way valve 230 is connected to the water-side heat exchanger 240, which is connected to the outdoor heat exchanger 250. An electronic expansion valve 260 is installed on the connecting pipe between the water-side heat exchanger 240 and the outdoor heat exchanger 250. The outdoor heat exchanger 250 is connected to the fourth end (E-tube) of the four-way valve 230. A coil temperature sensor 290 can be installed on the pipe of the outdoor heat exchanger, and an ambient temperature sensor 2100 can be installed near the air-side heat exchanger. The water-side heat exchanger 240 can be a shell-and-tube heat exchanger, and the outdoor heat exchanger 250 can be a finned heat exchanger. In addition, in some scenarios, an economizer can be installed on the connecting pipe between the water-side heat exchanger 240 and the outdoor heat exchanger 250, and the economizer is connected to the enthalpy-increasing end of the compressor. Furthermore, a high-pressure protection switch 2110 can be installed on the connecting pipe between the compressor 210 and the four-way valve 230.

[0037] like Figure 1 As shown, the air source heat pump unit control method may include steps S110 to S140.

[0038] Step S110: When the air source heat pump unit meets the low temperature cooling condition, the outdoor fan is controlled to rotate forward when the base point temperature is greater than or equal to the preset first temperature, and the outdoor fan is controlled to stop when the base point temperature is less than or equal to the preset second temperature. Step S120: When the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillating state, and the base point temperature is greater than or equal to the preset third temperature, control the outdoor fan to reverse at the initial reverse speed for a preset first duration; wherein, the initial reverse speed is determined based on the outdoor ambient temperature, and at the same outdoor ambient temperature, the outdoor fan reverses to provide a lower air volume than the outdoor fan forwards, and the base point temperature is determined based on at least one of the condensing temperature and the outdoor coil temperature.

[0039] When the air source heat pump unit meets the low-temperature cooling condition (e.g., the outdoor ambient temperature Ta is less than or equal to the preset low-temperature threshold (Ta≤15℃) and it is operating in cooling mode), the base point temperature Th can be determined in real time based on at least one of the condensing temperature Tc and the outdoor coil temperature T_coil. This base point temperature Th can accurately reflect the actual state of the outdoor heat exchanger. Furthermore, under the low-temperature cooling condition, when the base point temperature Th is greater than or equal to the preset first temperature T_on (i.e., Th≥T_on), the outdoor fan is controlled to rotate forward. If the base point temperature Th is less than or equal to the preset second temperature T_off during the forward rotation, the outdoor fan is controlled to stop immediately. When the base point temperature Th is greater than or equal to the preset first temperature T_on again, the outdoor fan is controlled to start rotating forward again. If the base point temperature Th is less than or equal to the preset second temperature T_off again during the forward rotation, the outdoor fan is controlled to stop immediately. This process is repeated to control the outdoor fan to rotate forward or stop. During this process, the number of times the external fan stops, N, can be counted. For example, the preset start / stop counter N is incremented by 1 each time the external fan stops (N = N+1).

[0040] The condensing temperature Tc can be calculated based on the high-pressure value monitored by the high-pressure sensor (Pc), the outdoor coil temperature T_coil can be detected by the coil temperature sensor, and the outdoor ambient temperature Ta can be detected by the ambient temperature sensor.

[0041] Furthermore, after each outdoor fan shutdown, the number of shutdowns N of the outdoor fan is used to determine whether the air source heat pump unit is in an oscillation state (i.e., an unstable state). After a certain outdoor fan shutdown, if it is determined that "the number of outdoor fan shutdowns N reflects that the air source heat pump unit is in an oscillation state" and "the base point temperature is greater than or equal to the preset third temperature T_om", the initial reverse rotation speed is determined based on the outdoor ambient temperature Ta, and the outdoor fan is controlled to reverse and run at this initial reverse rotation speed for a preset first time.

[0042] Since the initial reverse rotation speed of the outdoor fan is determined based on the outdoor ambient temperature Ta, and the outdoor fan provides a lower air volume when rotating in reverse compared to rotating forward at the same outdoor ambient temperature, controlling the outdoor fan to run in reverse at this initial reverse speed for a preset first time allows the air volume of the outdoor fan to be stably and accurately matched with excellent heat exchange effect, suppressing heat exchange and stabilizing condensing pressure, avoiding drastic fluctuations in condensing pressure around the set value, making the operation of the outdoor fan smooth and continuous, thereby effectively avoiding the cyclic start-stop of the outdoor fan, and further avoiding a series of low reliability problems such as high risk of compressor liquid return, low-pressure side pressure runaway causing ice blockage and liquid slugging.

[0043] Specifically, the preset first temperature T_on is greater than the preset second temperature T_off, and the preset third temperature T_om is greater than the preset second temperature T_off. The specific values ​​of the preset first temperature T_on, preset second temperature T_off, and preset third temperature T_om can be set according to actual conditions. For example, in one example, T_on = 45℃, T_off = 12℃, and T_om = 45℃. The preset first duration can also be set according to actual conditions; for example, the preset first duration could be equal to 3 minutes or 4 minutes, etc.

[0044] In summary, using the method described in this embodiment, under low-temperature cooling conditions, when the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillating state and the base temperature is greater than or equal to a preset third temperature, the outdoor ambient temperature determines the initial reverse rotation speed, and the outdoor fan is controlled to reverse at this initial reverse rotation speed for a preset first duration. Furthermore, at the same outdoor ambient temperature, the outdoor fan reversing provides a lower airflow compared to forward rotation, allowing the airflow of the outdoor fan to be stably and accurately matched with excellent heat exchange performance. This avoids drastic fluctuations in condensing pressure near the set value, effectively preventing the outdoor fan from cyclically starting and stopping, and further avoiding a series of low-reliability problems such as high compressor liquid return risk, low-pressure side pressure runaway leading to ice blockage and liquid slugging. Therefore, the overall reliability of the air source heat pump unit under low-temperature cooling conditions is effectively improved.

[0045] The following description Figure 1 Further optional specific embodiments are provided for each step performed when controlling an air source heat pump unit under the example.

[0046] In the embodiments of this application, the base point temperature Th is determined based on at least one of the condensation temperature Tc and the outdoor coil temperature T_coil.

[0047] In one embodiment, either the condensing temperature Tc or the outdoor coil temperature T_coil can be determined as the base point temperature.

[0048] Furthermore, in another specific embodiment, the maximum base temperature Th between the condensing temperature Tc and the outdoor coil temperature T_coil can be determined, i.e., Th=Max(T_coil, Tc). The applicant found that when Th=Max(T_coil, Tc), the use of this Th in the relevant embodiments of this application can further improve the reliability of the air source heat pump unit under low temperature cooling conditions.

[0049] Alternatively, in other embodiments, the base point temperature can be obtained by comprehensive calculation based on the condensation temperature Tc and the outdoor coil temperature T_coil.

[0050] In one embodiment, step S110, controlling the outdoor fan to rotate forward when the base point temperature is greater than or equal to a preset first temperature, may include: determining an initial forward rotation speed based on the outdoor ambient temperature when the base point temperature is greater than or equal to the preset first temperature; controlling the outdoor fan to rotate forward at the initial forward rotation speed for a preset second duration; after the outdoor fan continues to rotate forward at the initial forward rotation speed for a preset second duration, determining a forward rotation adjustment action based on the base point temperature; and adjusting the forward rotation speed of the outdoor fan according to the forward rotation adjustment action.

[0051] Each time the base point temperature Th is greater than or equal to the preset first temperature T_on, a suitable initial forward rotation speed is determined based on the outdoor ambient temperature Ta, and the outdoor fan is controlled to rotate stably at the initial forward rotation speed for a preset second time period. This preset second time period is a stable forward rotation period, which can avoid drastic pressure fluctuations caused by sudden changes in rotation speed. The preset second time period can be set according to actual conditions; for example, the preset first time period can be equal to 3 minutes or 4 minutes, etc.

[0052] Furthermore, after the outdoor fan continues to rotate forward at the initial forward speed for a preset second duration (i.e., during this preset second duration, neither the indoor nor outdoor fans are stopped, and the outdoor fan continues to rotate forward), the system enters the forward frequency conversion control stage based on the base point temperature Th. In the forward frequency conversion control stage, the forward adjustment action is determined based on the base point temperature Th, and the forward speed of the outdoor fan is adjusted according to the forward adjustment action. Specifically, the forward adjustment action can be determined based on the base point temperature Th every preset adjustment cycle to adjust the forward speed of the outdoor fan. This dynamic control in the forward frequency conversion control stage further ensures that the airflow always matches the target condensing temperature, further reducing the frequency of start-stop operations of the outdoor fan.

[0053] Furthermore, in one specific embodiment, when determining the initial forward rotation speed based on the outdoor ambient temperature, the initial forward rotation speed corresponding to the outdoor ambient temperature Ta can be retrieved by using a preset first tachometer. Alternatively, in other embodiments, the initial forward rotation speed can be calculated based on the outdoor ambient temperature using a preset function.

[0054] In one specific example, the preset first tachometer is shown in the table below. The preset first tachometer shows the initial forward rotation speed R1 corresponding to the temperature range of different outdoor ambient temperatures Ta.

[0055] Ta （+∞，15] （15，11] （11，7] （7，3] 3，-3] （-3，-7] （-7，-11] （-11，-16] （-16，-∞] R1 420 380 360 330 300 240 200 180 150 Furthermore, in one specific embodiment, determining the forward rotation adjustment action based on the base point temperature may specifically include: if the base point temperature is within a first range and remains within a predetermined time, the forward rotation adjustment action is to stop the outdoor fan; if the base point temperature is within a second range, the forward rotation adjustment action is to adjust the outdoor fan to a preset minimum forward rotation speed at a first decreasing rate; if the base point temperature is within a third range, the forward rotation adjustment action is to adjust the outdoor fan to a preset minimum forward rotation speed at a second decreasing rate; if the base point temperature is within a fourth range, the forward rotation adjustment action is to maintain the forward rotation speed of the outdoor fan; if the base point temperature is within a fifth range, the forward rotation adjustment action is to adjust the outdoor fan to a preset maximum forward rotation speed at a preset increasing rate; if the base point temperature is within a sixth range, the forward rotation adjustment action is to immediately adjust the outdoor fan to a preset maximum forward rotation speed; wherein, the first range to the sixth range increase sequentially.

[0056] According to this embodiment, the forward rotation adjustment action is determined based on the base point temperature, and the forward rotation speed of the external fan is adjusted according to the forward rotation adjustment action. This can further accurately and dynamically control the air volume of the external fan to always match the target condensing temperature, and further effectively reduce the frequent start-stop of the external fan.

[0057] The ranges from the first to the sixth increase sequentially, and can be defined according to actual conditions. The first descent rate is higher than the second descent rate, which can also be set according to actual conditions. The preset maximum forward rotation speed is the preset maximum allowable speed during forward rotation, and the preset minimum forward rotation speed is the preset minimum allowable speed during forward rotation. The preset ascent rate and the preset time can be set according to actual conditions. Specifically, in one example, see [reference needed]. Figure 3 The first range 310 is "Th≤18℃", the second range 320 is "18℃<Th≤29℃", the third range 330 is "29℃<Th≤38℃", the fourth range 340 is "38℃<Th≤45℃", the fifth range 350 is "45℃<Th≤60℃", and the sixth range 360 ​​is "60℃<Th"; the first descent rate is -20rpm / T1, where T1 is the preset first cycle; the second descent rate is -10rpm / T1; the preset ascent rate is +20rpm / T1; and the preset time is 5 seconds.

[0058] Alternatively, in other embodiments, multiple other ranges can be divided and a corresponding forward adjustment action can be specified for each range.

[0059] In one embodiment, step S120, where the number of shutdowns of the outdoor fan reflects that the air source heat pump unit is in an oscillation state, may include: determining that the air source heat pump unit is in an oscillation state when the number of shutdowns within a preset third time period is greater than or equal to a preset number.

[0060] The preset third duration can be longer than the aforementioned preset first duration and preset second duration. The specific size of the preset third duration can be set according to actual conditions. For example, the preset third duration can be equal to 10 minutes or 15 minutes. In this embodiment, when the number of shutdowns within the preset third duration is greater than or equal to a preset number (such as 3 or 4 times), it can be determined in a timely and accurate manner that the air source heat pump unit is in an oscillation state.

[0061] Specifically, when the base point temperature is greater than or equal to a preset first temperature, the initial forward rotation speed is determined based on the outdoor ambient temperature; the outdoor fan is controlled to rotate forward at the initial forward rotation speed for a preset second time; after the outdoor fan continues to rotate forward at the initial forward rotation speed for the preset second time, a forward adjustment action is determined based on the base point temperature; the forward rotation speed of the outdoor fan is adjusted according to the forward adjustment action. Within and after the preset second time, the outdoor fan will be controlled to stop when the base point temperature is less than or equal to the preset second temperature. Therefore, the number of times the outdoor fan stops, N, is continuously counted within and after the preset second time.

[0062] Optionally, in other embodiments, in step S120, the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillation state, including: calculating the stop frequency based on the number of stops, and determining that the air source heat pump unit is in an oscillation state if the stop frequency is higher than a predetermined frequency.

[0063] In one embodiment, after controlling the external fan to reverse at the initial reverse speed for a preset first time in step S120, the method may further include: after the external fan continues to reverse at the initial reverse speed for a preset first time, determining a reverse adjustment action based on the base point temperature; and adjusting the reverse speed of the external fan according to the reverse adjustment action.

[0064] After the outdoor fan continues to reverse at its initial reverse speed for a preset first duration (meaning that neither the indoor nor outdoor fan is stopped during this preset first duration, and the outdoor fan continues to reverse), the reverse frequency conversion control stage based on the base point temperature Th begins. During this stage, the reverse adjustment action is determined based on the base point temperature Th, and the reverse speed of the outdoor fan is adjusted accordingly. Specifically, the reverse adjustment action can be determined based on the base point temperature Th at preset adjustment cycles to adjust the outdoor fan's reverse speed. This dynamic control during the reverse frequency conversion control stage further ensures that the airflow consistently matches the target condensing temperature, further reducing the frequency of outdoor fan start-stop cycles.

[0065] Furthermore, in one specific embodiment, when determining the initial reverse rotation speed based on the outdoor ambient temperature, the initial reverse rotation speed corresponding to the outdoor ambient temperature Ta can be retrieved by using a preset second tachometer. Alternatively, in other embodiments, the initial reverse rotation speed can be calculated based on the outdoor ambient temperature using a preset function.

[0066] In one specific example, the preset second tachometer is shown in the table below, which shows the initial reverse rotation speed R2 corresponding to different outdoor ambient temperatures Ta within the temperature range.

[0067] Ta （+∞，15] （15，11] （11，7] （7，3] 3，-3] （-3，-7] （-7，-11] （-11，-16] （-16，-∞] R2 -700 -650 -600 -550 -500 -450 -400 -350 -300 Under the same outdoor ambient temperature, the outdoor fan provides a lower air volume when rotating in reverse compared to when rotating in forward. For example, when the outdoor ambient temperature is in the range of (11, 7], the initial forward rotation speed can be determined to be 360 ​​rpm according to the aforementioned preset first tachometer, and the initial reverse rotation speed can be determined to be -600 rpm according to the aforementioned preset second tachometer. The air volume provided by the outdoor fan when rotating in forward at 360 rpm is lower than the air volume provided by the outdoor fan when rotating in reverse at -600 rpm.

[0068] Furthermore, in one specific embodiment, determining the reversing adjustment action based on the base point temperature may include: if the base point temperature is within a first range and remains within a predetermined time, the reversing adjustment action is to stop the outdoor fan; if the base point temperature is within a second range, the reversing adjustment action is to adjust the outdoor fan to a preset minimum reversing speed at a first decreasing rate; if the base point temperature is within a third range, the reversing adjustment action is to adjust the outdoor fan to a preset minimum reversing speed at a second decreasing rate; if the base point temperature is within a fourth range, the reversing adjustment action is to maintain the reversing speed of the outdoor fan; if the base point temperature is within a fifth range, the reversing adjustment action is to adjust the outdoor fan to a preset maximum reversing speed at a preset increasing rate; if the base point temperature is within a sixth range, the reversing adjustment action is to immediately adjust the outdoor fan to a preset maximum reversing speed; wherein the first range to the sixth range increase sequentially.

[0069] According to this embodiment, the reverse adjustment action is determined based on the base point temperature, and the reverse speed of the external fan is adjusted according to the reverse adjustment action. This can further accurately and dynamically control the air volume of the external fan to always match the target condensing temperature, and further effectively reduce the frequent start-stop of the external fan.

[0070] The ranges from the first to the sixth increase sequentially, and can be divided according to actual conditions. The first descent rate is higher than the second descent rate, which can also be set according to actual conditions. The preset maximum reversing speed is the preset maximum speed allowed during reversal, and the preset minimum reversing speed is the preset minimum speed allowed during reversal. The preset ascending rate and the preset time can be set according to actual conditions. Specifically, in one example, see [reference needed]. Figure 4 The first range 310 is "Th≤18℃", the second range 320 is "18℃<Th≤29℃", the third range 330 is "29℃<Th≤38℃", the fourth range 340 is "38℃<Th≤45℃", the fifth range 350 is "45℃<Th≤60℃", and the sixth range 360 ​​is "60℃<Th"; the first descent rate is -20rpm / T2, where T2 is the preset second cycle; the second descent rate is -10rpm / T2; the preset ascent rate is +20rpm / T2; the predetermined time is 5S, where T2 can be equal to the aforementioned T1.

[0071] Alternatively, in other embodiments, multiple other ranges may be defined and a corresponding reversal adjustment action may be specified for each range.

[0072] Furthermore, in one embodiment, a "reverse mode exit mechanism during the reverse rotation of the outdoor fan" can also be provided. Specifically, if the reverse rotation speed of the outdoor fan is increased to the preset upper limit reverse rotation speed and the base point temperature is greater than or equal to the preset high temperature threshold, the outdoor fan is controlled to stop reversing; or, if the high-pressure protection switch of the air source heat pump unit is triggered, the outdoor fan is controlled to stop reversing.

[0073] The preset upper limit reverse speed is the preset upper limit speed during reverse rotation. This preset upper limit reverse speed can be set according to actual conditions and can be equal to the preset maximum reverse speed in the aforementioned embodiments. The preset high temperature threshold can also be set according to actual conditions; for example, it can be equal to 59℃, 60℃, 68℃, etc. During the reverse rotation of the outdoor fan, if the reverse speed increases to this preset upper limit reverse speed and the base point temperature is greater than or equal to the preset high temperature threshold, it indicates that the airflow provided by the reverse rotation is severely insufficient, leading to excessively high condensing pressure. The system is facing a high-pressure danger, and controlling the outdoor fan to stop reverse rotation can provide timely safety protection.

[0074] If the high-pressure protection switch of the air source heat pump unit is triggered during the reverse rotation of the outdoor fan, it indicates that the air volume provided by the reverse rotation is seriously insufficient, resulting in excessively high condensing pressure and the system is facing a high-pressure danger. In this case, the outdoor fan should be stopped from reversing to ensure timely safety protection.

[0075] Furthermore, in one embodiment, after the reverse mode exit mechanism is triggered, causing the control of the external fan to stop reversing, it can be further switched to the forward control mode and the shutdown count can be recalculated. Specifically: after the external fan stops reversing, if the base point temperature is greater than or equal to a preset first temperature, the external fan is controlled to rotate forward; if the base point temperature is less than or equal to a preset second temperature, the external fan is controlled to stop, and the number of shutdowns of the external fan is re-monitored.

[0076] When the base temperature Th is greater than or equal to the preset first temperature T_on (i.e., Th≥T_on), the outdoor fan is controlled to rotate forward. If, during forward rotation, the base temperature Th is less than or equal to the preset second temperature T_off, the outdoor fan is immediately stopped. If the base temperature Th again exceeds or equals the preset first temperature T_on, the outdoor fan is controlled to start rotating forward again. If, during forward rotation, the base temperature Th again falls below or equals the preset second temperature T_off, the outdoor fan is immediately stopped again. This process is repeated to cycle through the outdoor fan's rotation and shutdown. Furthermore, the number of times the outdoor fan stops is monitored again. Specifically, the preset start / stop counter N is set to 0, and then incremented by 1 (N = N+1) each time the outdoor fan stops.

[0077] After each outdoor fan shutdown, the number of shutdowns N of the outdoor fan is used to determine whether the air source heat pump unit is in an oscillation state (i.e., an unstable state). After a certain outdoor fan shutdown, if it is determined that "the number of outdoor fan shutdowns N reflects that the air source heat pump unit is in an oscillation state" and "the base point temperature is greater than or equal to the preset third temperature T_om", the initial reverse rotation speed is determined based on the outdoor ambient temperature Ta, and the outdoor fan is controlled to reverse and run at this initial reverse rotation speed for a preset first time.

[0078] To facilitate better implementation of the air source heat pump unit control method provided in this application, this application also provides an air source heat pump unit control device based on the above-described air source heat pump unit control method. The meanings of the terms used are the same as in the above-described air source heat pump unit control method, and specific implementation details can be found in the descriptions in the method embodiments. Figure 5 A block diagram of an air source heat pump unit control device according to an embodiment of this application is shown.

[0079] like Figure 5As shown, the air source heat pump unit control device 400 may include: a forward rotation control module 410, which can be used to: control the outdoor fan to rotate forward when the air source heat pump unit meets the low-temperature cooling condition and the base point temperature is greater than or equal to a preset first temperature, and control the outdoor fan to stop when the base point temperature is less than or equal to a preset second temperature; a reverse rotation control module 420, which can be used to: control the outdoor fan to reverse at an initial reverse rotation speed for a preset first duration when the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillation state, and the base point temperature is greater than or equal to a preset third temperature; wherein, the initial reverse rotation speed is determined according to the outdoor ambient temperature, and at the same outdoor ambient temperature, the reverse rotation of the outdoor fan provides a lower air volume than the forward rotation of the outdoor fan, and the base point temperature is determined according to at least one of the condensing temperature and the outdoor coil temperature.

[0080] In some embodiments of this application, when controlling the outdoor fan to rotate forward when the base point temperature is greater than or equal to a preset first temperature, the forward rotation control module 410 can be used to: determine an initial forward rotation speed based on the outdoor ambient temperature when the base point temperature is greater than or equal to the preset first temperature; control the outdoor fan to rotate forward at the initial forward rotation speed for a preset second duration; after the outdoor fan continues to rotate forward at the initial forward rotation speed for the preset second duration, determine a forward rotation adjustment action based on the base point temperature; and adjust the forward rotation speed of the outdoor fan according to the forward rotation adjustment action.

[0081] In some embodiments of this application, when determining the forward rotation adjustment action based on the base point temperature, the forward rotation control module 410 can be used to: if the base point temperature is within a first range and remains within a predetermined time, then the forward rotation adjustment action is to stop the external fan; if the base point temperature is within a second range, then the forward rotation adjustment action is to adjust the external fan to a preset minimum forward rotation speed at a first decreasing rate; if the base point temperature is within a third range, then the forward rotation adjustment action is to adjust the external fan to the preset minimum forward rotation speed at a second decreasing rate; if the base point temperature is within a fourth range, then the forward rotation adjustment action is to maintain the forward rotation speed of the external fan; if the base point temperature is within a fifth range, then the forward rotation adjustment action is to adjust the external fan to a preset maximum forward rotation speed at a preset increasing rate; if the base point temperature is within a sixth range, then the forward rotation adjustment action is to immediately adjust the external fan to the preset maximum forward rotation speed; wherein, the first range to the sixth range increase sequentially.

[0082] In some embodiments of this application, after the external fan is controlled to reverse at an initial reverse speed for a preset first time, the reverse control module 420 can be used to: determine a reverse adjustment action based on the base point temperature after the external fan continues to reverse at the initial reverse speed for the preset first time; and adjust the reverse speed of the external fan according to the reverse adjustment action.

[0083] In some embodiments of this application, when determining the reversal adjustment action based on the base point temperature, the reversal control module 420 can be used to: if the base point temperature is within a first range and remains within a predetermined time, then the reversal adjustment action is to stop the external fan; if the base point temperature is within a second range, then the reversal adjustment action is to adjust the external fan to a preset minimum reversal speed at a first decreasing rate; if the base point temperature is within a third range, then the reversal adjustment action is to adjust the external fan to the preset minimum reversal speed at a second decreasing rate; if the base point temperature is within a fourth range, then the reversal adjustment action is to maintain the reversal speed of the external fan; if the base point temperature is within a fifth range, then the reversal adjustment action is to adjust the external fan to a preset maximum reversal speed at a preset increasing rate; if the base point temperature is within a sixth range, then the reversal adjustment action is to immediately adjust the external fan to the preset maximum reversal speed; wherein, the first range to the sixth range increase sequentially.

[0084] In some embodiments of this application, after the outdoor fan is controlled to reverse at an initial reverse speed for a preset first time, the reverse control module 420 can be used to: control the outdoor fan to stop reversing if the reverse speed of the outdoor fan is increased to a preset maximum reverse speed; or, control the outdoor fan to stop reversing if the high-pressure protection switch of the air source heat pump unit is triggered.

[0085] In some embodiments of this application, after the control of the external fan to stop reversing, the forward rotation control module 410 can be used to: control the external fan to rotate forward when the base point temperature is greater than or equal to the preset first temperature after the external fan stops reversing; control the external fan to stop when the base point temperature is less than or equal to the preset second temperature; and restart monitoring the number of times the external fan stops.

[0086] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0087] Furthermore, embodiments of this application also provide an electronic device, such as... Figure 6 As shown, Figure 6 A block diagram of an electronic device according to an embodiment of this application is shown, specifically: The electronic device may include components such as a processor 501 with one or more processing cores, a memory 502 with one or more computer-readable storage media, a power supply 503, and an input unit 504. Those skilled in the art will understand that... Figure 6 The electronic device structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein: The processor 501 is the control center of the electronic device, connecting various parts of the computer device via various interfaces and lines. It executes software programs and / or modules stored in the memory 502, and calls data stored in the memory 502, to perform various functions of the computer device and process data. Optionally, the processor 501 may include one or more processing cores; preferably, the processor 501 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user page, and application programs, and the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 501.

[0088] The memory 502 can be used to store software programs and modules. The processor 501 executes various functional applications and data processing by running the software programs and modules stored in the memory 502. The memory 502 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 502 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 502 may also include a memory controller to provide the processor 501 with access to the memory 502.

[0089] The electronic device also includes a power supply 503 that supplies power to various components. Preferably, the power supply 503 can be logically connected to the processor 501 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 503 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0090] The electronic device may also include an input unit 504, which can be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0091] Although not shown, the electronic device may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 501 in the electronic device can load the executable files corresponding to the processes of one or more computer programs into the memory 502 according to the following instructions, and the processor 501 runs the computer programs stored in the memory 502, thereby realizing the various functions in the foregoing embodiments of this application.

[0092] For example, processor 501 can execute: when the air source heat pump unit meets the low-temperature cooling condition, control the outdoor fan to rotate forward when the base point temperature is greater than or equal to a preset first temperature, and control the outdoor fan to stop when the base point temperature is less than or equal to a preset second temperature; when the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillation state, and the base point temperature is greater than or equal to a preset third temperature, control the outdoor fan to reverse at an initial reverse speed for a preset first duration; wherein, the initial reverse speed is determined based on the outdoor ambient temperature, and at the same outdoor ambient temperature, the outdoor fan reverse rotation provides a lower air volume than the outdoor fan rotating forward, and the base point temperature is determined based on at least one of the condensing temperature and the outdoor coil temperature.

[0093] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by a computer program, or by a computer program controlling related hardware. The computer program can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0094] Therefore, embodiments of this application also provide a storage medium storing a computer program that can be loaded by a processor to execute the steps in any of the methods provided in embodiments of this application.

[0095] The storage medium can be a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0096] Since the computer program stored in the storage medium can execute the steps of any of the methods provided in the embodiments of this application, the beneficial effects that the methods provided in the embodiments of this application can achieve can be realized. For details, please refer to the previous embodiments, which will not be repeated here.

[0097] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0098] According to another embodiment of this application, a server may include: a memory storing a computer program; and a processor reading the computer program stored in the memory to execute the methods described in the embodiments of this application.

[0099] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0100] It should be understood that this application is not limited to the embodiments described above and shown in the accompanying drawings, but various modifications and changes can be made without departing from its scope.

Claims

1. A control method for an air source heat pump unit, characterized in that, include: When the air source heat pump unit meets the low temperature cooling condition, the outdoor fan is controlled to rotate forward when the base point temperature is greater than or equal to the preset first temperature, and the outdoor fan is controlled to stop when the base point temperature is less than or equal to the preset second temperature. When the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillation state, and the base temperature is greater than or equal to the preset third temperature, the outdoor fan is controlled to reverse at the initial reverse speed for a preset first duration. The initial reverse rotation speed is determined based on the outdoor ambient temperature, and at the same outdoor ambient temperature, the outdoor fan provides a lower air volume when rotating in reverse compared to when rotating in forward. The base point temperature is determined based on at least one of the condensing temperature and the outdoor coil temperature.

2. The method according to claim 1, characterized in that, The control of the external fan to rotate forward when the base point temperature is greater than or equal to a preset first temperature includes: When the base point temperature is greater than or equal to the preset first temperature, the initial forward rotation speed is determined according to the outdoor ambient temperature; The external fan is controlled to rotate forward at the initial forward rotation speed for a preset second duration; After the external fan continues to rotate forward at the initial forward rotation speed for the preset second duration, the forward rotation adjustment action is determined based on the base point temperature; The external fan speed is adjusted according to the forward rotation adjustment action.

3. The method according to claim 2, characterized in that, The step of determining the forward adjustment action based on the base point temperature includes: If the base point temperature is within the first range and remains within a predetermined time, then the forward adjustment action is to stop the external fan; If the base point temperature is within the second range, the forward rotation adjustment action is to adjust the external fan to the preset minimum forward rotation speed at a first decreasing rate; If the base point temperature is within the third range, the forward rotation adjustment action is to adjust the external fan to the preset minimum forward rotation speed at a second decreasing rate; If the base point temperature is within the fourth range, then the forward rotation adjustment action is to maintain the forward rotation speed of the external fan; If the base point temperature is within the fifth range, the forward rotation adjustment action is to adjust the external fan to the preset maximum forward rotation speed at a preset rate of increase; If the base point temperature is within the sixth range, the forward rotation adjustment action is to immediately adjust the external fan to the preset maximum forward rotation speed; The ranges from the first to the sixth increase sequentially.

4. The method according to claim 1, characterized in that, After controlling the external fan to reverse at an initial reverse speed for a preset first time, the method further includes: After the external fan continues to reverse at the initial reverse speed for the preset first time, the reverse adjustment action is determined based on the base point temperature; The external fan speed is adjusted in reverse according to the aforementioned reverse adjustment action.

5. The method according to claim 4, characterized in that, The step of determining the reversal adjustment action based on the base point temperature includes: If the base point temperature is within the first range and remains within a predetermined time, the reverse adjustment action is to stop the external fan; If the base point temperature is within the second range, the reverse adjustment action is to adjust the external fan to the preset minimum reverse speed at a first decreasing rate; If the base point temperature is within the third range, the reverse adjustment action is to adjust the external fan to the preset minimum reverse speed at a second decreasing rate; If the base point temperature is within the fourth range, the reverse adjustment action is to maintain the reverse rotation speed of the external fan; If the base point temperature is within the fifth range, the reverse adjustment action is to adjust the external fan to the preset maximum reverse speed at a preset rising rate; If the base point temperature is within the sixth range, the reverse adjustment action is to immediately adjust the external fan to the preset maximum reverse speed; The ranges from the first to the sixth increase sequentially.

6. The method according to any one of claims 1 to 5, characterized in that, The method further includes: If the reverse rotation speed of the external fan is increased to the preset upper limit reverse rotation speed, the external fan is controlled to stop reversing. Alternatively, if the high-pressure protection switch of the air source heat pump unit is triggered, the external fan is controlled to stop reversing.

7. The method according to claim 6, characterized in that, After controlling the external fan to stop reversing, the method further includes: After the external fan stops reversing, if the base point temperature is greater than or equal to the preset first temperature, the external fan is controlled to rotate forward. When the base point temperature is less than or equal to the preset second temperature, the external fan is controlled to stop, and the monitoring of the number of times the external fan stops is restarted.

8. A control device for an air source heat pump unit, characterized in that, include: The forward rotation control module is used to: control the outdoor fan to rotate forward when the base point temperature is greater than or equal to a preset first temperature, and control the outdoor fan to stop when the base point temperature is less than or equal to a preset second temperature, when the air source heat pump unit meets the low temperature cooling condition. The reversal control module is used to: control the outdoor fan to reverse at an initial reversal speed for a preset first duration when the number of times the outdoor fan stops reflects that the air source heat pump unit is in an oscillation state, and the base point temperature is greater than or equal to a preset third temperature; The initial reverse rotation speed is determined based on the outdoor ambient temperature, and at the same outdoor ambient temperature, the outdoor fan provides a lower air volume when rotating in reverse compared to when rotating in forward. The base point temperature is determined based on at least one of the condensing temperature and the outdoor coil temperature.

9. A storage medium, characterized in that, It stores a computer program that, when executed by the processor of the electronic device, causes the electronic device to perform the method described in any one of claims 1 to 7.

10. An electronic device, characterized in that, include: Memory, which stores computer programs; A processor reads a computer program stored in memory to perform the method described in any one of claims 1 to 7.

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