Air conditioner and control method, device and computer readable storage medium thereof

Abstract

Embodiments of the present application provide an air conditioner and a control method, device and computer readable storage medium thereof. The air conditioner control method is suitable for controlling an air conditioner comprising an indoor unit and an outdoor unit. The outdoor unit comprises a compressor. The air conditioner control method comprises: determining whether a refrigeration shutdown condition is met; in response to determining that the refrigeration shutdown condition is met, performing the following shutdown operation; successively shutting off a refrigerant output end and a refrigerant input end of the outdoor unit; after shutting off the refrigerant input end of the outdoor unit, shutting down the compressor; and after shutting down the compressor, opening the refrigerant output end of the outdoor unit and shutting it off again after a first preset time.

Description

Technical Field

[0001] This application relates to the field of air conditioner technology, specifically to an air conditioner and its control method, device, and computer-readable storage medium. Background Technology

[0002] Hydrocarbon refrigerants are relatively energy-efficient and environmentally friendly, and their use in air conditioners generally meets environmental requirements. However, hydrocarbon refrigerants are highly flammable, posing significant safety risks. Related technologies for air conditioners present a considerable risk of leakage, potentially leading to hydrocarbon refrigerant leaks on the indoor side, seriously threatening personal and property safety in the indoor environment. Summary of the Invention

[0003] This application provides an air conditioner and its control method, apparatus, and computer-readable storage medium, which can eliminate or at least significantly reduce the risk of hydrocarbon refrigerant leakage on the indoor side of the air conditioner, thereby improving the reliability and safety of the air conditioner.

[0004] In a first aspect, embodiments of this application provide an air conditioner control method suitable for controlling an air conditioner including an indoor unit and an outdoor unit, wherein the outdoor unit includes a compressor, and the air conditioner control method includes: determining whether cooling shutdown conditions are met; in response to determining that cooling shutdown conditions are met, performing the following shutdown operations: the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are sequentially shut down; after the refrigerant input terminal of the outdoor unit is shut down, the compressor stops; after the compressor stops, the refrigerant output terminal of the outdoor unit is turned on and shut down again after a first preset time.

[0005] In some embodiments, the air conditioner control method includes: determining whether heating shutdown conditions are met; and in response to determining that heating shutdown conditions are met, switching to cooling mode and performing the shutdown operation.

[0006] In some embodiments, determining whether the air conditioner meets the heating shutdown conditions includes: in response to the air conditioner being in heating mode, determining whether a shutdown command has been received or whether the heating temperature condition has been met, wherein the heating temperature condition is that within a first monitoring time, the difference between the indoor ambient temperature and the indoor coil temperature is within a first temperature range, and the difference between the outdoor ambient temperature and the outdoor coil temperature is within a second temperature range; in response to determining that a shutdown command has been received or the heating temperature condition has been met, determining that the air conditioner meets the heating shutdown conditions.

[0007] In some embodiments, the outdoor unit includes a four-way valve; switching to cooling mode includes: determining whether the operating frequency of the compressor is greater than a first preset frequency; in response to determining that the operating frequency of the compressor is greater than the first preset frequency, the compressor operates at the first preset frequency, and then the four-way valve reverses to switch the air conditioner to cooling mode; in response to determining that the operating frequency of the compressor is less than or equal to the first preset frequency, the four-way valve reverses to switch the air conditioner to cooling mode.

[0008] In some embodiments, after switching to cooling mode and before performing the shutdown operation, the air conditioner control method includes: the compressor operating at a second preset frequency, wherein the second preset frequency is greater than the first preset frequency.

[0009] In some embodiments, the indoor unit includes an indoor fan, and the outdoor unit includes an outdoor fan; after switching to cooling mode and performing the shutdown operation, the air conditioner control method includes: in response to determining that the heating start-up conditions are met, performing the following restart operation; the outdoor fan and the indoor fan start synchronously; after the outdoor fan and the indoor fan start synchronously and run for a first preset interval time, the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are simultaneously turned on; after the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are simultaneously turned on and continue for a second preset interval time, the four-way valve and the compressor start sequentially.

[0010] In some embodiments, the indoor unit includes an indoor fan; after switching to cooling mode and before performing the shutdown operation, the air conditioner control method includes: reducing the indoor fan speed to a minimum.

[0011] In some embodiments, the indoor unit includes an indoor fan, and the outdoor unit includes an outdoor fan; after the compressor stops, the shutdown operation includes: the outdoor fan and the indoor fan stopping sequentially.

[0012] In some embodiments, determining whether the air conditioner meets the cooling shutdown conditions includes: in response to the air conditioner being in cooling mode, determining whether a shutdown command has been received or whether the cooling temperature condition has been met, wherein the cooling temperature condition is that the difference between the indoor ambient temperature and the indoor coil temperature is within a third temperature range and the difference between the outdoor ambient temperature and the outdoor coil temperature is within a fourth temperature range within a second monitoring time; in response to determining that a shutdown command has been received or the cooling temperature condition has been met, determining that the air conditioner meets the cooling shutdown conditions.

[0013] In some embodiments, the indoor unit includes an indoor fan, and the outdoor unit includes an outdoor fan; after the shutdown operation is performed, the air conditioner control method includes: in response to determining that the cooling start-up conditions are met, performing the following restart operation; the outdoor fan and the indoor fan start synchronously; after the outdoor fan and the indoor fan start synchronously and run for a third preset interval, the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are simultaneously turned on; after the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are simultaneously turned on and continue for a fourth preset interval, the compressor starts.

[0014] Secondly, embodiments of this application provide an air conditioner control device, including: a first judgment circuit configured to determine whether cooling shutdown conditions are met; and a shutdown operation circuit configured to perform the following shutdown operation in response to determining that cooling shutdown conditions are met: the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are sequentially shut down; after the refrigerant input terminal of the outdoor unit is shut down, the compressor stops; after the compressor stops, the refrigerant output terminal of the outdoor unit is turned on and shut down again after a first preset time.

[0015] Thirdly, embodiments of this application provide an air conditioner, including: an indoor unit; an outdoor unit including a compressor, wherein the refrigerant output terminal of the outdoor unit is connected to the refrigerant input terminal of the indoor unit, and the refrigerant input terminal of the outdoor unit is connected to the refrigerant output terminal of the indoor unit; a memory storing a computer program; and a processor, wherein the computer program, when executed by the processor, implements the air conditioner control method described above.

[0016] In some embodiments, the indoor unit includes an indoor heat exchanger, and the outdoor unit includes an outdoor heat exchanger, a throttling and shut-off unit, an electric shut-off valve, a first refrigerant connection terminal, and a second refrigerant connection terminal, wherein the first refrigerant connection terminal, the indoor heat exchanger, and the second refrigerant connection terminal are sequentially connected; in cooling mode, the compressor's discharge port, the outdoor heat exchanger, the throttling and shut-off unit, and the first refrigerant connection terminal are sequentially connected, and the compressor's suction port, the electric shut-off valve, and the second refrigerant connection terminal are sequentially connected, wherein the throttling and shut-off unit and the first refrigerant connection terminal constitute the refrigerant output terminal of the outdoor unit, and the electric shut-off valve and the second refrigerant connection terminal constitute the refrigerant input terminal of the outdoor unit.

[0017] In some embodiments, the outdoor unit includes a four-way valve, which is connected to the exhaust port and intake port of the compressor, the outdoor heat exchanger, and the electric shut-off valve.

[0018] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps in the air conditioner control method described above.

[0019] The air conditioner control method provided in this application, when the cooling shutdown conditions are met, firstly controls the refrigerant output and refrigerant input terminals of the outdoor unit to be shut off sequentially, so that all the refrigerant in the indoor unit is safely recovered to the outdoor unit. Then, it controls the compressor to stop, so that the air conditioner stops cooling and achieves cooling shutdown. After the compressor stops, it controls the refrigerant output terminal of the outdoor unit to be reopened for a first preset time and then shut off again, releasing some of the refrigerant in the outdoor unit into the indoor unit to maintain positive pressure in the indoor unit. In this way, most of the refrigerant is stored in the outdoor unit, and only a small amount of refrigerant within a safe range remains in the indoor unit. On the one hand, this maintains positive pressure in the indoor unit and prevents air infiltration. On the other hand, it reduces the pressure difference between the indoor and outdoor units and prevents the high-pressure refrigerant in the outdoor unit from slowly leaking into the indoor unit. This ensures that the refrigerant content in the indoor unit is always within a safe range, which can eliminate or at least greatly reduce the risk of hydrocarbon refrigerant leakage on the indoor side of the air conditioner, and improve the reliability and safety of the air conditioner. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a flowchart of an air conditioner control method provided in some embodiments of this application;

[0022] Figure 2 This is a partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0023] Figure 3 This is another partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0024] Figure 4 This is another partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0025] Figure 5 This is another partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0026] Figure 6 This is another partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0027] Figure 7 This is another partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0028] Figure 8 This is another partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0029] Figure 9 This is a structural diagram of an air conditioner with cooling and heating functions provided in some embodiments of this application;

[0030] Figure 10 This is a structural diagram of an air conditioner with only cooling function provided in some embodiments of this application.

[0031] Explanation of key component symbols:

[0032] 1-Air conditioner, 10-Indoor unit, 11-Indoor heat exchanger, 12-Indoor fan, 20-Outdoor unit, 21-Compressor, 211-Exhaust port, 212-Intake port, 22-Outdoor heat exchanger, 23-Outdoor fan, 24-Four-way valve, 25-Throttling and shut-off unit, 26-Electric shut-off valve, 27-First refrigerant connection terminal, 28-Second refrigerant connection terminal. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0036] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0037] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0038] like Figure 1 As shown, in a first aspect, embodiments of this application provide an air conditioner control method suitable for controlling an air conditioner 1. This air conditioner control method includes steps S10 to S20, which can eliminate or at least significantly reduce the risk of hydrocarbon refrigerant leakage on the indoor side of the air conditioner 1, thereby improving the reliability and safety of the air conditioner 1.

[0039] Here, the air conditioner 1 has a split-type structure, correspondingly including an indoor unit 10 and an outdoor unit 20, wherein the outdoor unit 20 includes a compressor 21. The structural type of the air conditioner 1 can be determined according to actual needs, and can be, for example, a wall-mounted air conditioner, a floor-standing air conditioner, or other types with a split-type structure; this application embodiment does not limit this. The functional type of the air conditioner 1 can be determined according to actual needs, and can be, for example... Figure 9 The air conditioner shown is a combination of heating and cooling. Figure 10 The functional types shown in the embodiments of this application, such as single-cooling air conditioners, are not limited to these types.

[0040] The refrigerant output terminal of the outdoor unit 20 is connected to the refrigerant input terminal of the indoor unit 10, and the refrigerant input terminal of the outdoor unit 20 is connected to the refrigerant output terminal of the indoor unit 10. When the air conditioner 1 is running and cooling or heating, refrigerants such as hydrocarbon refrigerants can circulate between the outdoor unit 20 and the indoor unit 10. Furthermore, the outdoor unit 20 may be equipped with an outdoor heat exchanger 22, and the indoor unit 10 may be equipped with an indoor heat exchanger 11. When the air conditioner 1 is running in cooling mode, the refrigerant is compressed by the compressor 21 and output to the outdoor heat exchanger 22, and then output to the indoor unit 10 through the refrigerant output terminal of the outdoor unit 20. After passing through the indoor heat exchanger 11, it returns to the compressor 21 of the outdoor unit 20 from the refrigerant input terminal. When the air conditioner 1 is running in heating mode, the refrigerant is compressed by the compressor 21 and output to the indoor unit 10 through the refrigerant output terminal of the outdoor unit 20. After passing through the indoor heat exchanger 11, it returns to the outdoor unit 20 from the refrigerant input terminal of the outdoor unit 20, and then returns to the compressor 21 through the outdoor heat exchanger 22. Here, since the refrigerant flow direction is opposite in cooling mode and heating mode, one of the terminals of the outdoor unit 20 is used as the refrigerant output terminal of the outdoor unit 20 in cooling mode and as the refrigerant input terminal of the outdoor unit 20 in heating mode; correspondingly, the other terminal of the outdoor unit 20 is used as the refrigerant input terminal of the outdoor unit 20 in cooling mode and as the refrigerant output terminal of the outdoor unit 20 in heating mode.

[0041] S10: Determine whether the refrigeration shutdown conditions are met.

[0042] When air conditioner 1 is in cooling mode, it can be determined whether air conditioner 1 meets the cooling shutdown conditions. The cooling shutdown conditions can be that air conditioner 1 receives a shutdown command from the user or the current indoor and outdoor environmental parameters have reached or are close to the set value. When air conditioner 1 meets the cooling shutdown conditions, air conditioner 1 will shut down to stop cooling. Here, shutdown operation S20, including S21 to S23, can be executed to shut down air conditioner 1.

[0043] S21: The refrigerant output and refrigerant input terminals of outdoor unit 20 are shut off sequentially.

[0044] Here, both the refrigerant output and refrigerant input terminals of the outdoor unit 20 can be completely shut off or opened. During shutdown, the refrigerant output terminal of the outdoor unit 20 is shut off first, preventing the refrigerant in the outdoor unit 20 from continuing to enter the indoor unit 10. However, the refrigerant input terminal of the outdoor unit 20 remains open or even fully open, allowing the refrigerant in the indoor unit 10 to be quickly recovered to the outdoor unit 20. After the refrigerant output terminal of the outdoor unit 20 is shut off and a first shut-off interval has elapsed, it is determined that all the refrigerant in the indoor unit 10 has been recovered to the outdoor unit 20. At this point, the refrigerant input terminal of the outdoor unit 20 can be shut off to prevent the refrigerant in the outdoor unit 20 from flowing back into the indoor unit 10 through the refrigerant input terminal. In this way, all the refrigerant in the air conditioner 1 is recovered to the outdoor unit 20.

[0045] The first cutoff interval can be set according to actual needs, and this application embodiment does not limit it; the first cutoff interval can be set such that after the first cutoff interval has elapsed from the cutoff at the refrigerant output end of the outdoor unit 20, all the refrigerant in the indoor unit 10 can be recovered to the outdoor unit 20. For example, the value range of the first cutoff interval can be 1 to 2 minutes, such as 1 minute, 1.5 minutes or 2 minutes, etc.

[0046] S22: After the refrigerant input terminal of outdoor unit 20 is cut off, compressor 21 stops.

[0047] After the refrigerant input of the outdoor unit 20 is cut off, since the refrigerant output of the outdoor unit 20 has been cut off first, the refrigerant stops flowing between the outdoor unit 20 and the indoor unit 10 and is stored entirely in the outdoor unit 20; in this way, the compressor 21 can be controlled to stop, so that the air conditioner 1 stops cooling.

[0048] S23: After compressor 21 stops, the refrigerant output terminal of outdoor unit 20 is opened and remains open for a first preset time before being closed again. After air conditioner 1 stops cooling, the refrigerant output terminal of outdoor unit 20 is reopened, releasing some of the refrigerant from outdoor unit 20 into the piping of indoor unit 10; after the opening time reaches the first preset time, the refrigerant output terminal of outdoor unit 20 is closed again. In this way, indoor unit 10 stores an appropriate amount of refrigerant and maintains positive pressure. This prevents air infiltration and reduces the pressure difference between indoor unit 10 and outdoor unit 20, thereby preventing the high-pressure refrigerant in outdoor unit 20 from slowly leaking into indoor unit 10 through the gaps between the refrigerant input and output terminals of outdoor unit 20, further reducing the risk of hydrocarbon refrigerant leakage on the indoor side of air conditioner 1. In addition, at this refrigerant content, any refrigerant leakage in indoor unit 10 is minor or negligible and will not pose a safety threat to the indoor environment.

[0049] Compared with related technologies, the air conditioner control method provided in this application, when the cooling shutdown conditions are met, firstly controls the refrigerant output and refrigerant input terminals of the outdoor unit 20 to be shut off sequentially, so that all the refrigerant in the indoor unit 10 is safely recovered into the outdoor unit 20. Then, it controls the compressor 21 to stop, so that the air conditioner 1 stops cooling and achieves cooling shutdown. After the compressor 21 stops, it controls the refrigerant output terminal of the outdoor unit 20 to be reopened for a first preset time and then shut off again, releasing part of the refrigerant in the outdoor unit 20 into the indoor unit 10 so that the indoor unit 10 maintains normal operation. In this way, the vast majority of the refrigerant is stored in the outdoor unit 20, with only a small amount of refrigerant within a safe range remaining in the indoor unit 10. This maintains positive pressure in the indoor unit 10, preventing air infiltration, and also reduces the pressure difference between the indoor unit 10 and the outdoor unit 20, preventing the high-pressure refrigerant in the outdoor unit 20 from slowly leaking into the indoor unit 10. This ensures that the refrigerant content in the indoor unit 10 remains within a safe range, eliminating or at least significantly reducing the risk of hydrocarbon refrigerant leakage on the indoor side of the air conditioner 1, thereby improving the reliability and safety of the air conditioner 1.

[0050] The specific method for determining whether the cooling shutdown conditions are met can be determined according to actual needs, and this application does not limit this method in its embodiments. Figure 2 As shown, in some embodiments, S10 may include S11 to S12.

[0051] S11: In response to the air conditioner 1 being in cooling mode, determine whether a shutdown command has been received or whether the cooling temperature conditions have been met.

[0052] S12: In response to determining that a shutdown command has been received or that the cooling temperature condition has been met, it is determined that the air conditioner 1 meets the cooling shutdown condition.

[0053] Here, the shutdown command is a user-issued command to stop cooling, which can be sent to air conditioner 1 via input terminals such as control panels, remote controls, or remote control terminals. Upon receiving the shutdown command, it is determined that the cooling shutdown conditions are met, and air conditioner 1 can be controlled to perform shutdown operations according to S21 to S23.

[0054] Here, the cooling temperature reaching condition is that, within the second monitoring time, the difference between the indoor ambient temperature and the indoor coil temperature is within the third temperature range, and the difference between the outdoor ambient temperature and the outdoor coil temperature is within the fourth temperature range. The differences between the indoor ambient temperature and the indoor coil temperature, and the differences between the outdoor ambient temperature and the outdoor coil temperature, can be absolute values. The second monitoring time can be set according to actual needs, and this application embodiment does not limit this; for example, the second monitoring time can be set to 10-15 seconds, such as 10 seconds, 10.5 seconds, 11.2 seconds, 12 seconds, 12.5 seconds, 13 seconds, 13.6 seconds, 14 seconds, 14.5 seconds, or 15 seconds, etc. The third and fourth temperature ranges can be determined according to actual needs, and their values ​​or ranges can be the same or different. This application does not limit this. For example, the third and fourth temperature ranges can be 0.5 to 1.5°C, such as 0.5°C, 0.7°C, 0.85°C, 1°C, 1.2°C, 1.35°C or 1.5°C.

[0055] In other words, it can be determined whether the difference between the indoor ambient temperature and the indoor coil temperature is within the third temperature range during the second monitoring period, and whether the difference between the outdoor ambient temperature and the outdoor coil temperature is within the fourth temperature range. If the difference between the indoor ambient temperature and the indoor coil temperature is within the third temperature range during the second monitoring period, and the difference between the outdoor ambient temperature and the outdoor coil temperature is within the fourth temperature range, then it is determined that the current ambient temperature has reached or is close to the set temperature, and the air conditioner 1 has achieved the purpose of temperature regulation and can be shut down. At this time, it is also determined that the cooling shutdown condition is met, and the air conditioner 1 can be controlled to perform shutdown operation according to S21 to S23.

[0056] By setting the above parameters, it is possible to accurately determine whether the cooling shutdown conditions are met, and then perform the shutdown operation in a timely manner.

[0057] like Figure 9 and Figure 10 As shown, in some embodiments, indoor unit 10 may include indoor fan 12, and outdoor unit 20 may include outdoor fan 23. For example... Figure 3 As shown, after executing S20 to achieve cooling shutdown, the air conditioner control method may include S30 to S40 to control the air conditioner 1 to restart the heating mode in a timely manner when the cooling start-up conditions are met.

[0058] S30: In response to determining that the cooling start-up conditions are met, the following restart operation S40 is performed. Here, the cooling start-up conditions may be that the air conditioner 1 receives a restart start-up command issued by the user or that the current indoor and outdoor environmental parameters have deviated significantly from the set values. When it is determined that the air conditioner 1 meets the cooling start-up conditions, the air conditioner 1 restarts to resume cooling. Here, S40 includes S41 to S43.

[0059] S41: Outdoor fan 23 and indoor fan 12 start synchronously.

[0060] S42: After the outdoor fan 23 and indoor fan 12 start and run synchronously for a third preset interval, the refrigerant output and refrigerant input terminals of the outdoor unit 20 are simultaneously turned on. The third preset interval can be set according to actual needs, and this embodiment does not limit it; the third preset interval can be set such that after the outdoor fan 23 and indoor fan 12 start and run synchronously for a third preset interval, any leaking refrigerant that may exist near the indoor unit 10 and the outdoor unit 20 is blown away. In this way, when the refrigerant output and refrigerant input terminals of the outdoor unit 20 are turned on, it can be ensured that the leaking refrigerant has been blown away, and the surrounding environment has been restored to a safe state, avoiding further aggravation of the safety hazards caused by refrigerant leakage during refrigerant circulation.

[0061] S43: After the refrigerant output and refrigerant input terminals of the outdoor unit 20 are simultaneously turned on and continue for the fourth preset interval time, the compressor 21 starts.

[0062] After the refrigerant output and refrigerant input terminals of the outdoor unit 20 are simultaneously turned on, the refrigerant can flow to the indoor unit 10 under the pressure difference between the outdoor unit 20 and the indoor unit 10, and fill the entire refrigerant circulation pipeline after a fourth preset interval. After the entire refrigerant circulation pipeline is evenly filled with refrigerant, the compressor 21 can be controlled to start for heating operation; during this process, the four-way valve 24 does not need to be activated for reversing. The fourth preset interval can be set according to actual needs, and this application embodiment does not limit it; the fourth preset interval can be set such that after the refrigerant output and refrigerant input terminals of the outdoor unit 20 are simultaneously turned on and the fourth preset interval continues, the entire refrigerant circulation pipeline is evenly filled with refrigerant.

[0063] By setting S30 to S40, the cooling start-up demand can be responded to in a timely manner, enabling air conditioner 1 to promptly restart in cooling mode and resume cooling to meet the indoor cooling needs.

[0064] In some embodiments, air conditioner 1 can be a cooling and heating air conditioner 1, that is, it has both cooling and heating functions. For example... Figure 4 As shown, the air conditioner control method may include S50 to S60.

[0065] S50: Determine whether the heating shutdown conditions are met. When the air conditioner 1 is in heating mode, it can be determined whether the air conditioner 1 meets the heating shutdown conditions. The heating shutdown conditions may be that the air conditioner 1 receives a shutdown command issued by the user or the current indoor and outdoor environmental parameters have reached or are close to the set values.

[0066] S60: In response to determining that the heating shutdown condition is met, the system switches to cooling mode and performs a shutdown operation as described in S20. When the heating shutdown condition is met, air conditioner 1 shuts down to stop heating. Here, a shutdown operation as described in S20 can be performed to shut down air conditioner 1. In other words, the shutdown operation of air conditioner 1 is consistent when both the cooling and heating shutdown conditions are met, i.e., it is performed according to S21 to S23.

[0067] In this way, when the heating shutdown conditions are met, the system can first switch from heating mode to cooling mode. Then, following the shutdown operation of S20, the refrigerant output and input terminals of the outdoor unit 20 are sequentially shut off, ensuring all refrigerant in the indoor unit 10 is safely recovered into the outdoor unit 20. Next, the compressor 21 is shut down, stopping the air conditioner 1 from cooling and achieving heating shutdown. After the compressor 21 stops, the refrigerant output terminal of the outdoor unit 20 is reopened for a first preset time and then shut off again, releasing some refrigerant from the outdoor unit 20 into the indoor unit 10, thus stopping the indoor unit 10. Maintaining positive pressure ensures that the majority of the refrigerant is stored in the outdoor unit 20, with only a small amount remaining in the indoor unit 10 within a safe range. This maintains positive pressure in the indoor unit 10, preventing air infiltration, and also reduces the pressure difference between the indoor unit 10 and the outdoor unit 20, preventing the high-pressure refrigerant in the outdoor unit 20 from slowly leaking into the indoor unit 10. This keeps the refrigerant content in the indoor unit 10 within a safe range, eliminating or at least significantly reducing the risk of hydrocarbon refrigerant leakage on the indoor side of the air conditioner 1, thus improving the reliability and safety of the air conditioner 1.

[0068] The specific method for determining whether the heating shutdown conditions are met can be determined according to actual needs, and this application does not limit this method in its embodiments. Figure 5 As shown, in some examples, S50 may include S51 to S52.

[0069] S51: In response to the air conditioner 1 being in heating mode, determine whether a shutdown command has been received or whether the heating temperature conditions have been met. The heating temperature conditions are that the difference between the indoor ambient temperature and the indoor coil temperature is within a first temperature range within a first monitoring time, and the difference between the outdoor ambient temperature and the outdoor coil temperature is within a second temperature range.

[0070] S52: In response to determining that a shutdown command has been received or that the heating temperature conditions have been met, it is determined that the air conditioner 1 meets the heating shutdown conditions.

[0071] Here, the shutdown command is a user-issued command to stop heating, which can be sent to air conditioner 1 via input terminals such as control panels, remote controls, or remote control terminals. Upon receiving the shutdown command, it is determined that the cooling shutdown conditions are met, and air conditioner 1 can be controlled to perform shutdown operations according to S21 to S23.

[0072] Here, the heating temperature reaching condition is that, within the first monitoring time, the difference between the indoor ambient temperature and the indoor coil temperature is within a first temperature range, and the difference between the outdoor ambient temperature and the outdoor coil temperature is within a second temperature range. The differences between the indoor ambient temperature and the indoor coil temperature, and the differences between the outdoor ambient temperature and the outdoor coil temperature, can be absolute values. The first monitoring time can be set according to actual needs, and this embodiment does not limit this; for example, the first monitoring time can be set to 10-15 seconds, such as 10 seconds, 10.5 seconds, 11.2 seconds, 12 seconds, 12.5 seconds, 13 seconds, 13.6 seconds, 14 seconds, 14.5 seconds, or 15 seconds, etc. The first temperature range and the second temperature range can be determined according to actual needs. Their values ​​or ranges can be the same or different, and this application does not limit this. For example, the first temperature range and the second temperature range can be 0.5 to 1.5°C, such as 0.5°C, 0.7°C, 0.85°C, 1°C, 1.2°C, 1.35°C or 1.5°C.

[0073] In other words, it can be determined whether the difference between the indoor ambient temperature and the indoor coil temperature is within the first temperature range during the first monitoring time, and whether the difference between the outdoor ambient temperature and the outdoor coil temperature is within the second temperature range. If the difference between the indoor ambient temperature and the indoor coil temperature is within the first temperature range during the first monitoring time, and the difference between the outdoor ambient temperature and the outdoor coil temperature is within the second temperature range, then it is determined that the current ambient temperature has reached or is close to the set temperature, and the air conditioner 1 has achieved the purpose of temperature regulation and can be shut down. At this time, it is also determined that the heating shutdown condition is met, and the air conditioner 1 can be controlled to perform shutdown operation according to S21 to S23.

[0074] By setting the above parameters, it is possible to accurately determine whether the heating shutdown conditions are met, and then perform the shutdown operation in a timely manner.

[0075] like Figure 9As shown, in some examples, the outdoor unit 20 may include a four-way valve 24; in cooling mode, the four-way valve 24 is connected to the discharge port 211 and suction port 212 of the compressor 21, the outdoor heat exchanger 22, and the refrigerant input terminal of the outdoor unit 20, respectively; while in heating mode, the four-way valve 24 is connected to the discharge port 211 and suction port 212 of the compressor 21, the outdoor heat exchanger 22, and the refrigerant output terminal of the outdoor unit 20, respectively. Figure 6 As shown, here, S60 may include S61 to S63 to switch from heating mode to cooling mode.

[0076] S61: Determine whether the operating frequency of compressor 21 is greater than a first preset frequency. The first preset frequency can be determined according to actual needs, and can be a point value or a range value. This application embodiment does not limit this. For example, the first preset frequency can be a range value, with a range of 30 to 40 Hz.

[0077] S62: In response to determining that the operating frequency of compressor 21 is greater than the first preset frequency, compressor 21 operates at the first preset frequency, and then the four-way valve 24 reverses to switch air conditioner 1 to cooling mode. When the operating frequency of compressor 21 is greater than the first preset frequency, it indicates that the operating frequency of compressor 21 is high and higher than the safe frequency for the four-way valve 24 to reverse. If the four-way valve 24 is reversed at this time, it is easy to cause damage to the internal flow path structure of outdoor unit 20. At this time, it is necessary to first reduce the operating frequency of compressor 21 to the first preset frequency before controlling the four-way valve 24 to reverse and change the flow direction of refrigerant, so that air conditioner 1 switches from heating mode to cooling mode.

[0078] S63: In response to determining that the operating frequency of the compressor 21 is less than or equal to the first preset frequency, the four-way valve 24 reverses to switch the air conditioner 1 to cooling mode. When the operating frequency of the compressor 21 is less than or equal to the first preset frequency, it indicates that the operating frequency of the compressor 21 is within the safe frequency range when the four-way valve 24 reverses. At this time, the refrigerant flow direction can be changed by directly controlling the refrigerant valve 24 to reverse, thereby switching the air conditioner 1 from heating mode to cooling mode.

[0079] By setting S61 to S63, the four-way valve 24 can be reversed when the compressor 21 is running at the first preset frequency, ensuring the safety of the flow path structure inside the outdoor unit 20 when the four-way valve 24 reverses; and there is no need to completely stop the compressor 21, which can save the overall operation time of the four-way valve 24 reversing process and improve the reversing operation efficiency.

[0080] For example, in S60, after S62 or S63 and before performing a shutdown operation such as S20, the air conditioner control method may include S64.

[0081] S64: Compressor 21 operates at a second preset frequency, which is greater than the first preset frequency. The second preset frequency can be determined according to actual needs, and can be a point value or a range value; this embodiment does not limit this. For example, the second preset frequency can be a range value, with a range of 50 to 60 Hz.

[0082] In other words, after the four-way valve 24 reverses, the compressor 21 can be frequency-increased, increasing its operating frequency from the first preset frequency to the second preset frequency. This allows S21 to run at the higher second preset frequency, accelerating the refrigerant recovery from the indoor unit 10 to the outdoor unit 20, reducing the running time of S21 and the cold air blowing time after switching to cooling mode, so as to avoid a noticeable cold air feeling in the indoor environment and better ensure the heating effect of the air conditioner 1.

[0083] For example, indoor unit 10 may include indoor fan 12; such as Figure 7 As shown, in S60, after switching to cooling mode and before performing a shutdown operation as in S20, the air conditioner control method may include S65.

[0084] S65: Indoor fan 12 is reduced to the minimum speed. Here, the minimum speed can be a specific speed value or a fan speed setting, which is not limited in this embodiment. By controlling the indoor unit 10 to reduce its speed to the minimum, the amount of cold air blown by the indoor unit 10 after switching to cooling mode can be reduced, so as to avoid a noticeable cold air feeling in the indoor environment and better ensure the heating effect of the air conditioner 1. For example, when the indoor fan 12 is reduced to the minimum speed, the outdoor fan 23 can continue to maintain its current speed until it stops.

[0085] Here, the order of S65 can be determined according to actual needs, and this application embodiment does not limit it. For example, S65 can be performed after S64 and before the shutdown operation such as S20; or S65 can be performed after S62 or S63 and before S64; or S65 can be performed synchronously with S64; or S65 can be performed after S62 or S63 and before the shutdown operation such as S20 when S60 does not include S64.

[0086] For example, indoor unit 10 may include indoor fan 12, and outdoor unit 20 may include outdoor fan 23; such as Figure 8 As shown, here, after S60, the air conditioner control method may include S70 to S80 to control the air conditioner 1 to restart the heating function in a timely manner when the heating start-up conditions are met.

[0087] S70: In response to determining that the heating start-up conditions are met, a restart operation S80 is performed. Here, the heating start-up conditions may be that the air conditioner 1 receives a restart start-up command from the user or that the current indoor and outdoor environmental parameters have deviated significantly from the set values. When it is determined that the air conditioner 1 meets the heating start-up conditions, the air conditioner 1 restarts to resume heating. Here, S80 includes S81 to S83.

[0088] S81: Outdoor fan 23 and indoor fan 12 start synchronously.

[0089] S82: After the outdoor fan 23 and the indoor fan 12 start and run synchronously for a first preset interval, the refrigerant output and refrigerant input terminals of the outdoor unit 20 are simultaneously turned on. The first preset interval can be set according to actual needs, and this embodiment does not limit it; the first preset interval can be set such that after the outdoor fan 23 and the indoor fan 12 start and run synchronously for the first preset interval, any leaked refrigerant that may exist near the indoor unit 10 and the outdoor unit 20 is blown away. In this way, when the refrigerant output and refrigerant input terminals of the outdoor unit 20 are turned on, it can be ensured that the leaked refrigerant has been blown away, and the surrounding environment has been restored to a safe state, avoiding further aggravation of the safety hazards caused by refrigerant leakage during refrigerant circulation. The values ​​of the first preset interval and the third preset interval can be the same or different, and this embodiment does not limit them.

[0090] S83: After the refrigerant output and refrigerant input terminals of the outdoor unit 20 are opened simultaneously and continue for the second preset interval time, the four-way valve 24 and the compressor 21 start in sequence.

[0091] After the refrigerant output and refrigerant input terminals of the outdoor unit 20 are simultaneously turned on, the refrigerant can flow to the indoor unit 10 under the pressure difference between the outdoor unit 20 and the indoor unit 10, and fill the entire refrigerant circulation pipeline after a second preset interval. After the entire refrigerant circulation pipeline is evenly filled with refrigerant, the four-way valve 24 can be controlled to first start reversing to change the flow direction of the refrigerant, so that the air conditioner 1 switches back to the heating mode, and then the compressor 21 is controlled to start for heating operation. The second preset interval can be set according to actual needs, and this application embodiment does not limit it; the second preset interval can be set such that after the refrigerant output and refrigerant input terminals of the outdoor unit 20 are simultaneously turned on and the second preset interval continues, the entire refrigerant circulation pipeline is evenly filled with refrigerant. The values ​​of the second preset interval and the fourth preset interval can be the same or different, and this application embodiment does not limit them.

[0092] By setting S70 to S80, the heating start-up demand can be responded to in a timely manner, enabling the air conditioner 1 to promptly and smoothly restart in heating mode and resume heating to meet the indoor heating needs.

[0093] In some embodiments, indoor unit 10 may include indoor fan 12, and outdoor unit 20 may include outdoor fan 23. Here, after S22, S20 may include S203 to further refine the shutdown operation.

[0094] S203: Outdoor fan 23 and indoor fan 12 are shut down sequentially. Here, the outdoor fan 23 and indoor fan 12 are controlled to continue running for a period of time after the compressor 21 stops. The outdoor fan 23 is used to continue heat exchange between the outdoor air and the outdoor heat exchanger 22, and the indoor fan 12 is used to drive the indoor return air to continue heat exchange with the indoor heat exchanger 11, so as to better utilize the remaining cooling capacity to meet the cooling / heating needs. Subsequently, the outdoor fan 23 can be shut down first, and then the indoor fan 12 can be shut down.

[0095] Secondly, embodiments of this application provide an air conditioner control device, which includes a first judgment circuit and a shutdown operation circuit. The first judgment circuit is configured to determine whether cooling shutdown conditions are met. The shutdown operation circuit is configured to perform the following shutdown operation in response to determining that the cooling shutdown conditions are met: the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are sequentially shut off; after the refrigerant input terminal of the outdoor unit is shut off, the compressor stops; after the compressor stops, the refrigerant output terminal of the outdoor unit is turned on and remains on for a first preset time before shutting off again.

[0096] like Figures 9 to 10 As shown in the third aspect, this application provides an air conditioner 1, which includes an indoor unit 10, an outdoor unit 20, a processor, and a memory. The outdoor unit 20 includes a compressor 21, and the refrigerant output terminal of the outdoor unit 20 is connected to the refrigerant input terminal of the indoor unit 10, and the refrigerant input terminal of the outdoor unit 20 is connected to the refrigerant output terminal of the indoor unit 10. The memory stores a computer program, which, when executed by the processor, implements the above-described air conditioner control method. The structural type of the air conditioner 1 can be determined according to actual needs, and can be, for example, a wall-mounted air conditioner, a floor-standing air conditioner, or other types with a split structure; this application does not limit this. The functional type of the air conditioner 1 can be determined according to actual needs, and can be, for example, a wall-mounted air conditioner, a floor-standing air conditioner, or other types with a split structure. Figure 9 Air conditioners (heating and cooling) Figure 10 The embodiments of this application do not limit the functional types of single-cooling air conditioners, etc.

[0097] The processor is connected to the memory and can perform various actions and processes according to the programs stored in the memory. Specifically, the processor can be an integrated circuit chip with signal processing capabilities. The aforementioned processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor, and can be based on an x86 architecture or an ARM architecture.

[0098] The memory can be volatile or non-volatile, or may include both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM) used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory used in the methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0099] In some embodiments, the indoor unit 10 may include an indoor heat exchanger 11, and the outdoor unit 20 may include an outdoor heat exchanger 22, a throttling and shut-off unit 25, an electric shut-off valve 26, a first refrigerant connection terminal 27, and a second refrigerant connection terminal 28, wherein the first refrigerant connection terminal 27, the indoor heat exchanger 11, and the second refrigerant connection terminal 28 are connected in sequence.

[0100] In cooling mode, the compressor 21's discharge port 211, outdoor heat exchanger 22, throttling cutoff unit 25, and first refrigerant connection terminal 27 are sequentially connected. The compressor 21's suction port 212, electric shut-off valve 26, and second refrigerant connection terminal 28 are sequentially connected. The throttling cut-off unit 25 and the first refrigerant connection terminal 27 form the refrigerant output terminal of the outdoor unit 20, and the electric shut-off valve 26 and the second refrigerant connection terminal 28 form the refrigerant input terminal of the outdoor unit 20. When the air conditioner 1 shuts down during cooling, since the air conditioner 1 is in cooling mode, during execution S21, the throttling cut-off unit 25 and the electric shut-off valve 26 are sequentially shut off, with the throttling cut-off unit 25 shutting off before the electric shut-off valve 26. Correspondingly, during execution S23, the throttling cut-off unit 25 reopens after the compressor 21 stops and remains open for a first preset time before shutting off again.

[0101] Conversely, in heating mode, the compressor 21's suction port 212, outdoor heat exchanger 22, throttling cutoff unit 25, and first refrigerant connection terminal 27 are sequentially connected. The compressor 21's discharge port 211, electric shut-off valve 26, and second refrigerant connection terminal 28 are sequentially connected. The throttling cutoff unit 25 and the first refrigerant connection terminal 27 form the refrigerant input terminal of the outdoor unit 20, and the electric shut-off valve 26 and the second refrigerant connection terminal 28 form the refrigerant output terminal of the outdoor unit 20. When the air conditioner 1 shuts down during heating, since the air conditioner 1 needs to switch to cooling mode before the shutdown operation and then execute the shutdown operation as in S20, the throttling cutoff unit 25 and the electric shut-off valve 26 are also sequentially shut off during the execution of step S21, with the throttling cutoff unit 25 shutting off before the electric shut-off valve 26. Correspondingly, during the execution of step S23, the throttling cutoff unit 25 reopens after the compressor 21 stops and remains closed again after a first preset time.

[0102] The type of electrically operated shut-off valve 26 can be determined according to actual needs, and can be, for example, an electrically controlled shut-off valve, a solenoid shut-off valve, etc. This application embodiment does not limit this. The type of throttling shut-off unit 25 can be determined according to actual needs, and can be implemented using a capillary tube or a throttling short tube in conjunction with an electrically driven shut-off valve, or can be implemented using an electronically expanded valve that can completely shut off. This application embodiment does not limit this. The type of electrically driven shut-off valve can be determined according to actual needs, and can be, for example, an electrically controlled shut-off valve, a solenoid shut-off valve, etc. This application embodiment does not limit this.

[0103] The type of the first refrigerant connection 27 can be determined according to actual needs, and this application embodiment does not limit it. In some examples, the first refrigerant connection 27 can be a two-way shut-off valve, such as a manual two-way shut-off valve. The type of the second refrigerant connection 28 can be determined according to actual needs, and this application embodiment does not limit it. In some examples, the second refrigerant connection 28 can be a three-way shut-off valve, such as a manual three-way shut-off valve.

[0104] In some examples, the outdoor unit 20 may include a four-way valve 24, which is connected to the exhaust port 211 and intake port 212 of the compressor 21, the outdoor heat exchanger 22, and the electric shut-off valve 26.

[0105] For example, the first refrigerant connection 27 can be an electrically operated two-way shut-off valve, which can perform a complete shut-off function under electronic control. Here, the throttling shut-off unit 25 can still be implemented using a capillary tube or a throttling short tube in conjunction with an electrically driven shut-off valve, as described above, or it can be implemented using an electronic expansion valve that can completely shut off, forming a multi-stage complete shut-off to further reduce the risk of refrigerant leakage. Alternatively, the throttling shut-off unit 25 can also be implemented using a capillary tube / throttling short tube or an electronic expansion valve that cannot completely shut off, and there is no need to set up an electrically driven shut-off valve, so that the throttling shut-off unit 25 mainly performs a throttling function rather than a shut-off function, saving the number of fluid devices required.

[0106] For example, the second refrigerant connection 28 can be an electric three-way shut-off valve, and the outdoor unit 20 can still be equipped with an electric shut-off valve 26 as described above, forming a multi-stage complete shut-off to further reduce the risk of refrigerant leakage.

[0107] For example, the second refrigerant connection terminal 28 can be an electric three-way shut-off valve. In this case, the electric shut-off valve 26 can be omitted, and the electric three-way shut-off valve connects to the compressor 21, saving the number of fluid components required. In cooling mode, the suction port 212 of the compressor 21 is connected to the electric three-way shut-off valve, which serves as the refrigerant input terminal of the outdoor unit 20. When the outdoor unit 20 includes a four-way valve 24, the suction port 212 of the compressor 21 can be connected to the electric three-way shut-off valve through the four-way valve 24. In heating mode, the discharge port 211 of the compressor 21 is connected to the electric three-way shut-off valve, which serves as the refrigerant output terminal of the outdoor unit 20. When the outdoor unit 20 includes a four-way valve 24, the discharge port 211 of the compressor 21 can be connected to the electric three-way shut-off valve through the four-way valve 24.

[0108] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps in the control method of any of the above embodiments.

[0109] For example, the aforementioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., CDs (Compact Disks), DVDs (Digital Versatile Disks), etc.), smart cards, and flash memory devices (e.g., EPROMs (Erasable Programmable Read-Only Memory), cards, sticks, or key drives, etc.). The various computer-readable storage media described in the embodiments of this application may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0110] The above provides a detailed description of an air conditioner and its control method, apparatus, and computer-readable storage medium provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An air conditioner control method, characterized in that, An air conditioner suitable for controlling an indoor unit and an outdoor unit, wherein the indoor unit includes an indoor fan and the outdoor unit includes a compressor, a four-way valve and an outdoor fan; The air conditioner control method includes: Determine whether the refrigeration shutdown conditions are met; In response to the determination that the cooling shutdown conditions are met, the following shutdown operation is performed; The refrigerant output and refrigerant input terminals of the outdoor unit are shut off sequentially. The compressor stops after the refrigerant input at the outdoor unit is cut off; After the compressor stops, the refrigerant output terminal of the outdoor unit is turned on and remains on for a first preset time before being turned off again. The air conditioner control method further includes: Determine whether the heating shutdown conditions are met; In response to determining that the heating shutdown conditions are met, the system switches to cooling mode and performs the shutdown operation. After switching to cooling mode and performing the shutdown operation, the air conditioner control method further includes: If the heating start-up conditions are determined to be met, the following restart operation will be performed; The outdoor fan and the indoor fan start synchronously; After the outdoor fan and the indoor fan start and run synchronously for a first preset interval, the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are turned on synchronously. After the refrigerant output and refrigerant input terminals of the outdoor unit are simultaneously opened and continue for a second preset interval time, the four-way valve and the compressor start sequentially. After the compressor stops, the shutdown operation includes: The outdoor fan and the indoor fan are shut down in sequence.

2. The air conditioner control method according to claim 1, characterized in that, Determining whether the air conditioner meets the heating shutdown conditions includes: In response to the air conditioner being in heating mode, it is determined whether a shutdown command has been received or whether the heating temperature conditions have been met. The heating temperature conditions are that, within a first monitoring time, the difference between the indoor ambient temperature and the indoor coil temperature is within a first temperature range, and the difference between the outdoor ambient temperature and the outdoor coil temperature is within a second temperature range. In response to determining that a shutdown command has been received or that the heating temperature conditions have been met, the air conditioner is determined to meet the heating shutdown conditions.

3. The air conditioner control method according to claim 1, characterized in that, Switching to cooling mode includes: Determine whether the operating frequency of the compressor is greater than a first preset frequency; In response to determining that the operating frequency of the compressor is greater than a first preset frequency, the compressor operates at the first preset frequency, and then the four-way valve reverses to switch the air conditioner to cooling mode; In response to determining that the operating frequency of the compressor is less than or equal to a first preset frequency, the four-way valve reverses to switch the air conditioner to cooling mode.

4. The air conditioner control method according to claim 3, characterized in that, After switching to cooling mode and before performing the shutdown operation, the air conditioner control method includes: The compressor operates at a second preset frequency, which is greater than the first preset frequency.

5. The air conditioner control method according to claim 1, characterized in that, After switching to cooling mode and before performing the shutdown operation, the air conditioner control method includes: The indoor fan is reduced to its lowest speed.

6. The air conditioner control method according to claim 1, characterized in that, Determining whether the air conditioner meets the cooling shutdown conditions includes: In response to the air conditioner being in cooling mode, it is determined whether a shutdown command has been received or whether the cooling temperature condition has been met. The cooling temperature condition is that, within the second monitoring time, the difference between the indoor ambient temperature and the indoor coil temperature is within the third temperature range, and the difference between the outdoor ambient temperature and the outdoor coil temperature is within the fourth temperature range. In response to the determination that a shutdown command has been received or that the cooling temperature condition has been met, the air conditioner is determined to meet the cooling shutdown condition.

7. The air conditioner control method according to claim 1, characterized in that, After performing the shutdown operation, the air conditioner control method includes: In response to the determination that the cooling start-up conditions are met, the following restart operation is performed; The outdoor fan and the indoor fan start synchronously; After the outdoor fan and the indoor fan start and run synchronously for a third preset interval, the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are turned on synchronously. The compressor starts after the refrigerant output and refrigerant input terminals of the outdoor unit are simultaneously turned on and remain so for a fourth preset interval.

8. An air conditioner control device, characterized in that, An air conditioner suitable for controlling an indoor unit and an outdoor unit, wherein the indoor unit includes an indoor fan and the outdoor unit includes a compressor, a four-way valve and an outdoor fan; The air conditioner control device includes: The first judgment circuit is configured to determine whether the cooling shutdown conditions are met. The shutdown operation circuit is configured to perform the following shutdown operation in response to determining that the cooling shutdown conditions are met; The refrigerant output and refrigerant input terminals of the outdoor unit are shut off sequentially. The compressor stops after the refrigerant input at the outdoor unit is cut off; After the compressor stops, the refrigerant output terminal of the outdoor unit is turned on and remains on for a first preset time before being turned off again. After the compressor stops, the outdoor fan and the indoor fan stop in sequence. The air conditioner control device is further configured to, after switching to cooling mode and performing the shutdown operation, perform the following restart operation in response to determining that the heating start-up conditions are met; The outdoor fan and the indoor fan start synchronously; After the outdoor fan and the indoor fan start and run synchronously for a first preset interval, the refrigerant output terminal and the refrigerant input terminal of the outdoor unit are turned on synchronously. After the refrigerant output and refrigerant input terminals of the outdoor unit are simultaneously opened and maintained for a second preset interval time, the four-way valve and the compressor are started sequentially.

9. An air conditioner, characterized in that, include: Indoor unit, including indoor fan; The outdoor unit includes a compressor, a four-way valve, and an outdoor fan. The refrigerant output terminal of the outdoor unit is connected to the refrigerant input terminal of the indoor unit, and the refrigerant input terminal of the outdoor unit is connected to the refrigerant output terminal of the indoor unit. Memory, which stores computer programs; A processor, wherein the computer program, when executed by the processor, implements the air conditioner control method as described in any one of claims 1 to 7.

10. The air conditioner according to claim 9, characterized in that, The indoor unit includes an indoor heat exchanger, and the outdoor unit includes an outdoor heat exchanger, a throttling and shut-off unit, an electric shut-off valve, a first refrigerant connection terminal, and a second refrigerant connection terminal. The first refrigerant connection terminal, the indoor heat exchanger, and the second refrigerant connection terminal are connected in sequence. In cooling mode, the compressor's exhaust port, the outdoor heat exchanger, the throttling and shut-off unit, and the first refrigerant connection terminal are connected in sequence. The compressor's suction port, the electric shut-off valve, and the second refrigerant connection terminal are connected in sequence. The throttling and shut-off unit and the first refrigerant connection terminal form the refrigerant output terminal of the outdoor unit, and the electric shut-off valve and the second refrigerant connection terminal form the refrigerant input terminal of the outdoor unit.

11. The air conditioner according to claim 10, characterized in that, The four-way valve is connected to the exhaust port and intake port of the compressor, the outdoor heat exchanger, and the electric shut-off valve, respectively.

12. A computer-readable storage medium, characterized in that, It stores a computer program, which is loaded by a processor to execute the steps of the air conditioner control method according to any one of claims 1 to 7.

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