Method for controlling air conditioner, apparatus, air conditioner, and storage medium

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a method for controlling an air conditioner, the air conditioner comprising a throttling heat exchanger; the air conditioner further comprises a first refrigerant circulation loop and a second refrigerant circulation loop that share the throttling heat exchanger; by switching the on-off state of the first refrigerant circulation loop and the second refrigerant circulation loop, the throttling heat exchanger can be switched between different split modes; the method comprises the following steps: acquiring an outdoor environment temperature in the case that the air conditioner is locked; determining a target split mode of the throttling heat exchanger according to the outdoor environment temperature; and controlling the on-off state of the first refrigerant circulation loop and the second refrigerant circulation loop according to the target split mode. The scheme can improve the energy efficiency of the air conditioner based on the refrigerant split form of the throttling heat exchanger. The scheme is matched with the variable split capacity of the throttling heat exchanger, and can effectively improve the energy efficiency of the air conditioner. The application further discloses a device for controlling an air conditioner, an air conditioner and a storage medium.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, such as a method, apparatus, air conditioner, and storage medium for controlling an air conditioner. Background Technology

[0002] Air conditioners undergo energy efficiency testing before leaving the factory to obtain an energy efficiency value. This value indicates the rate at which the air conditioner consumes energy, allowing users to more intuitively assess its power consumption.

[0003] A related technology discloses an energy efficiency testing and control method for an air conditioning system. The air conditioning system includes a variable frequency compressor and a variable frequency drive controller that controls the operating state of the variable frequency compressor. The energy efficiency testing and control method includes the following steps: after the air conditioning system enters an energy efficiency testing mode; the operating parameters of the air conditioning system are detected, and the operating condition of the air conditioning system is determined based on the operating parameters; when the operating condition is a high load condition, the switching loss of the variable frequency drive controller is reduced; and / or when the operating condition is a low load condition, the torque compensation of the variable frequency compressor is reduced.

[0004] The methods described above improve air conditioner energy efficiency by reducing energy loss. In addition, related technologies include adjusting parameters such as the air conditioner's frequency and the opening of the electronic expansion valve to achieve optimal energy efficiency. These solutions are applicable to traditional air conditioners. However, they are not suitable for air conditioners that have undergone structural updates to effectively improve energy efficiency. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a method, apparatus, air conditioner, and storage medium for controlling an air conditioner to effectively improve its energy efficiency.

[0007] In some embodiments, the air conditioner includes: a throttling heat exchanger; the air conditioner further includes: a first refrigerant circulation loop and a second refrigerant circulation loop sharing the throttling heat exchanger; by switching the on / off state of the first refrigerant circulation loop and the second refrigerant circulation loop, the throttling heat exchanger can switch between different flow splitting modes; the method includes: acquiring the outdoor ambient temperature when the air conditioner is frequency locked; determining the target flow splitting mode of the throttling heat exchanger based on the outdoor ambient temperature; and controlling the on / off state of the first refrigerant circulation loop and the second refrigerant circulation loop based on the target flow splitting mode.

[0008] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to execute the aforementioned method for controlling an air conditioner when the program instructions are executed.

[0009] In some embodiments, the air conditioner includes: a throttling heat exchanger; the air conditioner further includes: a first refrigerant circulation loop and a second refrigerant circulation loop sharing the throttling heat exchanger; the throttling heat exchanger can switch between different flow splitting modes by switching the on / off states of the first refrigerant circulation loop and the second refrigerant circulation loop; and, as described above, a device for controlling the air conditioner.

[0010] In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for controlling an air conditioner.

[0011] The method, apparatus, air conditioner, and storage medium for controlling an air conditioner provided in this disclosure can achieve the following technical effects:

[0012] This solution proposes a method to improve air conditioning energy efficiency based on the refrigerant diversion mode of a throttling heat exchanger. Outdoor ambient temperature affects refrigerant heat exchange, thus impacting air conditioning energy efficiency. Different diversion modes also have varying effects on refrigerant heat exchange and pressure loss. Therefore, by matching a suitable diversion mode to the outdoor ambient temperature, the refrigerant heat exchange and / or pressure loss can be optimized to achieve a more suitable state. Furthermore, the on / off states of the first and second refrigerant circulation loops are controlled to ensure the throttling heat exchanger meets the target diversion mode, thereby improving air conditioning energy efficiency. Moreover, this method of improving energy efficiency is compatible with the variable diversion capability of the throttling heat exchanger. This achieves the goal of providing a suitable energy efficiency improvement method for air conditioners with updated structures.

[0013] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0014] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0015] Figure 1 This is a schematic diagram of the throttling heat exchanger provided in an embodiment of this disclosure;

[0016] Figure 2 This is a schematic diagram of refrigerant flow when the air conditioner is operating in heating mode and the throttling heat exchanger is used as the outdoor heat exchanger, according to an embodiment of this disclosure.

[0017] Figure 3This is a schematic diagram of refrigerant flow when the air conditioner is operating in cooling mode and the throttling heat exchanger acts as the outdoor heat exchanger, according to an embodiment of this disclosure.

[0018] Figure 4 This is a schematic diagram of refrigerant flow when the first refrigerant circulation loop of the air conditioner is connected, according to an embodiment of this disclosure;

[0019] Figure 5 This is a schematic diagram of refrigerant flow when the second refrigerant circulation loop of the air conditioner is connected, according to an embodiment of this disclosure;

[0020] Figure 6 This is a schematic diagram of a method for controlling an air conditioner provided in an embodiment of this disclosure;

[0021] Figure 7 This is a schematic diagram of another method for controlling an air conditioner provided in an embodiment of this disclosure;

[0022] Figure 8 This is an application illustration provided by an embodiment of the present disclosure;

[0023] Figure 9 This is a schematic diagram of a method for controlling the oil return of an air conditioning compressor according to an embodiment of this disclosure;

[0024] Figure 10 This is a schematic diagram of a device for controlling an air conditioner provided in an embodiment of this disclosure;

[0025] Figure 11 This is a schematic diagram of another device for controlling an air conditioner provided in an embodiment of this disclosure.

[0026] Figure label:

[0027] 1. Compressor; 2. Outdoor heat exchanger; 3. Indoor heat exchanger; 4. First pipeline; 5. Second pipeline; 6. Third pipeline; 7. Fourth pipeline; 8. Fifth pipeline; 9. First on / off valve; 10. Second on / off valve; 11. Third on / off valve; 12. Fourth on / off valve; 13. Throttling device;

[0028] 200. Throttling heat exchanger; 210. Heat exchange pipeline; 211. First heat exchange branch; 212. Second heat exchange branch; 213. Third heat exchange branch; 221. First distributor; 222. Second distributor; 223. Third distributor; 224. Fourth distributor; 2211. First distributor branch pipe; 2212. Second distributor branch pipe; 231. First throttling element; 232. Second throttling element; 240. Bypass pipeline; 241. Solenoid valve. Detailed Implementation

[0029] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0030] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0031] Unless otherwise stated, the term "multiple" means two or more.

[0032] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0033] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0034] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0035] An air conditioner consists of an indoor unit and an outdoor unit. The indoor unit includes an indoor heat exchanger and an indoor fan, which facilitates heat exchange between the refrigerant and the indoor environment. The outdoor unit includes an outdoor heat exchanger, an outdoor fan, a compressor, and a gas-liquid separator, which perform functions such as heat exchange between the refrigerant and the outdoor environment, refrigerant compression, and refrigerant throttling. These components—the indoor heat exchanger, outdoor heat exchanger, compressor, and gas-liquid separator—are connected by refrigerant piping to form a refrigerant circulation system that circulates the refrigerant between the indoor and outdoor units.

[0036] Combination Figure 1As shown, this disclosure also provides a throttling heat exchanger. The throttling heat exchanger 200 includes a heat exchange pipeline 210, a first distributor 221, and a throttling element. The heat exchange pipeline 210 includes multiple parallel heat exchange branches. The first distributor 221 includes a main pipe and multiple distribution branches, which are connected to the multiple heat exchange branches. The throttling element is disposed between the heat exchange branches and the first distributor 221 to throttle the refrigerant after it has been diverted by the first distributor 221 and before it enters the heat exchange branches.

[0037] Understandably, in combination Figure 2 and Figure 3 As shown, when the flow direction of the refrigerant in the throttling heat exchanger 200 is different, the connection form of each heat exchange branch will also be different, specifically, multiple heat exchange branches are connected in parallel, or the number of heat exchange branches is reduced. In this way, the variable flow distribution of the throttling heat exchanger 200 is realized.

[0038] like Figure 1 As shown, in the throttling heat exchanger 200 provided in this embodiment, the throttling element is disposed between the heat exchange branch and the first distributor 221, which can throttle the refrigerant after it has been diverted by the first distributor 221 and before it enters the heat exchange branch. That is, no pressure reduction or throttling is performed before the refrigerant flowing into the outdoor heat exchanger is diverted by the first distributor 221. At this time, the liquid content of the refrigerant entering the first distributor 221 is relatively large, which improves the liquid distribution uniformity of the first distributor 221, and thus improves the heat exchange uniformity of the throttling heat exchanger 200.

[0039] Optionally, the first distributor 221 includes a first dispensing branch pipe 2211 and a second dispensing branch pipe 2212. The first dispensing branch pipe 2211 is connected to one or more heat exchange branches, and the second dispensing branch pipe 2212 is connected to one or more heat exchange branches. The first dispensing branch pipe 2211 is provided with a first throttling element 231, and the second dispensing branch pipe 2212 is provided with a second dispensing element.

[0040] Each branch pipe of the first distributor 221 is equipped with a throttling element to throttle the refrigerant flowing out through different branch pipes. For example... Figure 1 As shown.

[0041] Optionally, the heat exchange pipeline 210 includes an upper heat exchange pipeline and a lower heat exchange pipeline. The upper heat exchange pipeline includes a first heat exchange branch 211 and a second heat exchange branch 212 connected in parallel, and the lower heat exchange pipeline includes a third heat exchange branch 213. The refrigerant outlets of the first heat exchange branch 211 and the second heat exchange branch 212 are connected to a second distributor 222, the refrigerant inlets of the second heat exchange branch 212 and the third heat exchange branch 213 are connected to a third distributor 223, and the refrigerant inlet of the first heat exchange branch 211 is connected to a fourth distributor 224. A first throttling element 231 is disposed between the first distributor branch 2211 and the second distributor 222, and a second throttling element 232 is disposed between the second distributor branch 2212 and the third heat exchange branch 213. Optionally, the throttling heat exchanger 200 also includes a bypass pipeline 240. The bypass line 240 connects the third distributor 223 and the fourth distributor 224, and the bypass line 240 is equipped with a solenoid valve 241.

[0042] When the air conditioner is operating in heating mode, and the throttling heat exchanger 200 is used as the outdoor heat exchanger, the refrigerant flow path within the throttling heat exchanger 200 is as follows: Figure 2 As shown. The solenoid valve 241 between the fourth distributor 224 and the third distributor 223 is activated, and simultaneously, the electronic expansion valve between the second distributor 222 and the first distributor branch 2211 is activated. Specifically, the low-temperature, low-pressure refrigerant enters the first distributor 221 through the main pipe of the throttling heat exchanger 200, and after being split, enters the first throttling element 231 and the second throttling element 232 respectively. After passing through the first throttling element 231, the refrigerant enters the first heat exchange branch 211 and the second heat exchange branch 212 through the second distributor 222 for heat exchange. After passing through the second throttling element 232, the refrigerant enters the third heat exchange branch 213 for heat exchange. After heat exchange in the second heat exchange branch 212 and the third heat exchange branch 213, the refrigerant merges through the third distributor 223 and further flows out through the fourth distributor 224; after heat exchange in the first heat exchange branch 211, the refrigerant flows out through the fourth distributor 224. That is, the first heat exchange branch 211, the second heat exchange branch 212 and the third heat exchange branch 213 are connected in parallel under heating conditions.

[0043] When the air conditioner is operating in cooling mode, and the throttling heat exchanger 200 is used as the outdoor heat exchanger, the refrigerant flow path within the throttling heat exchanger 200 is as follows: Figure 3As shown. The solenoid valve 241 between the fourth distributor 224 and the third distributor 223 is closed. Simultaneously, the electronic expansion valve between the second distributor 222 and the first distributor branch pipe 2211 is closed. Specifically, the high-temperature, high-pressure refrigerant enters the fourth distributor 224 through another main pipe of the throttling heat exchanger 200, flows into the first heat exchange branch 211, then flows into the second heat exchange branch 212 through the second distributor 222, and then into the third heat exchange branch 213 through the third distributor 223. The refrigerant flowing out of the third heat exchange branch 213 is throttled and depressurized by the second throttling element 232 before flowing out through the first distributor 221. That is, the first heat exchange branch 211, the second heat exchange branch 212, and the third heat exchange branch 213 are connected in series under refrigeration conditions.

[0044] Optionally, the first throttling element 231 is an electronic expansion valve. In this way, the flow path of the refrigerant in the throttling heat exchanger 200 can be different by controlling the opening or closing of the electronic expansion valve.

[0045] To achieve variable flow distribution in the outdoor heat exchanger, a check valve can also be installed at the location where the electronic expansion valve is set. Optionally, the second throttling element 232 is a capillary tube.

[0046] Combination Figure 4 and Figure 5 As shown in the figure, this disclosure provides an air conditioner. The air conditioner includes: a first refrigerant circulation loop and a second refrigerant circulation loop.

[0047] Compressor 1 is connected to the fourth distributor 224 of throttling heat exchanger 200 via the first pipe 4. The first distributor 221 is connected to the indoor heat exchanger 3 via the second pipe 5. The indoor heat exchanger 3 is connected to compressor 1 via the third pipe 6. In this way, compressor 1, first pipe 4, throttling heat exchanger 200, second pipe 5, indoor heat exchanger 3, and third pipe 6 form the first refrigerant circulation loop.

[0048] The first end of the fourth pipe 7 is connected to the first position on the first pipe 4, and the second end is connected to the second position on the second pipe 5. The first end of the fifth pipe 8 is connected to the third position on the first pipe 4, and the second end is connected to the fourth position on the second pipe 5. In this way, the compressor 1, the fourth pipe 7, the throttling heat exchanger 200, the fifth pipe 8, the indoor heat exchanger 3, and the third pipe 6 form a second refrigerant circulation loop.

[0049] A first on / off valve 9 is installed on the first pipeline 4, and the first on / off valve 9 is located between the first position and the third position. A second on / off valve 10 is installed on the second pipeline 5, and the second on / off valve 10 is located between the second position and the fourth position. A third on / off valve 11 is installed on the fourth pipeline 7. A fourth on / off valve 12 is installed on the fifth pipeline 8. By switching the on / off state of the first refrigerant circulation loop and the second refrigerant circulation loop, the heat exchange branches can be switched between parallel and series connection states.

[0050] Combination Figure 4 As shown, the first on / off valve 9 and the second on / off valve 10 are opened, while the solenoid valve 241 and the electronic expansion valve 231 are closed to connect the first refrigerant circulation loop. At the same time, the third on / off valve 11 and the fourth on / off valve 12 are closed to disconnect the second refrigerant circulation loop. In this way, each heat exchange branch can be connected in series.

[0051] Combination Figure 5 As shown, the first on-off valve 9 and the second on-off valve 10 are closed to disconnect the first refrigerant circulation loop. At the same time, the third on-off valve 11 and the fourth on-off valve 12 are opened, and the solenoid valve 241 and the electronic expansion valve 231 are turned on to connect the second refrigerant circulation loop. In this way, the heat exchange branches can be connected in parallel.

[0052] A throttling device 13 is installed on the second pipe 5. The throttling device 13 is located between the indoor heat exchanger 3 and the fourth position. By controlling the opening of the throttling device 13, the flow rate of refrigerant between the outdoor heat exchanger 2 and the indoor heat exchanger 3 can be controlled. The throttling device 13 is always open, whether the heat exchange branches are connected in series or in parallel, to ensure normal refrigerant circulation. Optionally, the throttling device 13 is an expansion valve.

[0053] The air conditioner mentioned above can be either a cooling-only air conditioner or a cooling and heating air conditioner. When it is a cooling and heating air conditioner, it also includes a four-way valve.

[0054] Combination Figure 6 As shown in the embodiments of this disclosure, a method for controlling an air conditioner is provided, comprising:

[0055] S601, the processor obtains the outdoor ambient temperature when the air conditioner is locked at the same frequency.

[0056] S602, the processor determines the target flow splitting mode of the throttling heat exchanger based on the outdoor ambient temperature.

[0057] S603, the processor controls the on / off state of the first refrigerant circulation loop and the second refrigerant circulation loop according to the target flow distribution mode.

[0058] Air conditioner energy efficiency is generally judged based on seasonal energy efficiency. Tests typically include rated heating, rated cooling, intermediate heating, and intermediate cooling. During energy efficiency testing, the air conditioner is controlled to operate at a fixed frequency. The air conditioner's processor communicates with an outdoor temperature sensor to obtain the outdoor ambient temperature. Alternatively, the processor connects to a network to obtain the outdoor ambient temperature from the cloud. Different outdoor ambient temperatures have different effects on the air conditioner's energy efficiency. For example, the harsher the outdoor environment (higher / lower temperature), the lower the air conditioner's heat exchange capacity, and thus its energy efficiency. Therefore, further control based on the outdoor ambient temperature is necessary. The target flow distribution mode of the throttling heat exchanger is determined based on the outdoor ambient temperature. Different flow distribution modes involve different connection methods for each heat exchange branch. Different connection methods have different effects on refrigerant heat exchange and pressure loss. This ensures the target flow distribution mode matches the outdoor ambient temperature, thereby improving the air conditioner's energy efficiency during testing. As mentioned earlier, the throttling heat exchanger includes multiple heat exchange branches. According to the target flow distribution mode, the on / off state of the first and second refrigerant circulation loops is controlled, and the connection state of each heat exchange branch is controlled, so that the flow distribution of refrigerant by the throttling heat exchanger meets the target flow distribution mode.

[0059] In this embodiment, the outdoor ambient temperature affects the heat exchange of the refrigerant, thus affecting the energy efficiency of the air conditioner. Different flow distribution modes also have different effects on refrigerant heat exchange and pressure loss. Therefore, a suitable flow distribution mode is matched based on the outdoor ambient temperature to achieve a more suitable state for refrigerant heat exchange and / or pressure loss. The on / off states of the first and second refrigerant circulation loops are controlled to ensure that the throttling heat exchanger meets the target flow distribution mode, thereby improving the air conditioner's energy efficiency. Moreover, this method of improving energy efficiency is matched with the variable flow distribution capability of the throttling heat exchanger. This achieves the goal of providing a suitable energy efficiency improvement method for air conditioners with updated structures.

[0060] Optionally, in step S602, the processor determines the target flow splitting mode of the throttling heat exchanger based on the outdoor ambient temperature, including:

[0061] When the outdoor ambient temperature is higher than the temperature threshold, the processor determines the target load balancing mode as multi-path mode.

[0062] When the outdoor ambient temperature is less than or equal to the temperature threshold, the processor determines the frequency locking method; based on the frequency locking method, it determines the target flow splitting mode of the throttling heat exchanger.

[0063] Set temperature threshold T n To determine the outdoor ambient temperature T w Is it too high? Optionally, T... n For any temperature value between 40℃ and 43℃. If T w >T nThis indicates that the outdoor ambient temperature is too high. At this time, the air conditioner's heat exchange capacity is poor, and the operating load is very high. Therefore, the target distribution mode is determined to be multi-path mode. Multi-path mode means that the heat exchange branches are connected in parallel, allowing the throttling heat exchanger to distribute the refrigerant through multiple paths. When the throttling heat exchanger distributes the refrigerant through multiple paths, the pipes through which the refrigerant flows become shorter, reducing pressure loss. This is beneficial for releasing the air conditioner's cooling / heating capacity, thereby improving the air conditioner's energy efficiency.

[0064] If T w ≤T n This indicates that the outdoor ambient temperature is not high. At this time, the outdoor ambient temperature does not significantly affect the heat exchange capacity of the air conditioner. Therefore, the frequency locking method should be determined first. Different frequency locking methods have different effects on the energy efficiency of the air conditioner. Based on the frequency locking method, the target flow distribution mode of the throttling heat exchanger is determined so that the target flow distribution mode can match the frequency locking method, effectively improving the energy efficiency of the air conditioner.

[0065] In this way, by matching the target flow distribution mode of the throttling heat exchanger with the different outdoor ambient temperatures and different frequency locking methods, the energy efficiency of the air conditioner can be effectively improved.

[0066] Optionally, users can send a frequency lock command to the air conditioner via remote control, app, or other means. After receiving the frequency lock command, the air conditioner's processor parses it to determine the frequency lock mode. Frequency lock modes include: rated frequency lock and intermediate frequency lock. Different frequency lock modes correspond to different frequencies. The rated frequency lock has a higher frequency than the intermediate frequency lock.

[0067] Different frequency locking methods correspond to different cooling / heating parameters. Taking cooling parameters as an example, these mainly manifest as cooling capacity and cooling power. The same applies to heating parameters. The cooling / heating parameters corresponding to the rated frequency locking are greater than those corresponding to the intermediate frequency. Different flow distribution modes of a throttling heat exchanger correspond to different numbers of heat exchange branches. The larger the cooling / heating parameters, the more heat exchange branches the target flow distribution mode corresponds to.

[0068] If the frequency locking method is rated frequency locking, then the target distribution mode is determined to be multi-path mode, meaning that each heat exchange branch is connected in parallel. This is because: when the frequency is locked, the air conditioner usually operates at a high frequency. A high frequency means higher system pressure, resulting in relatively higher pressure loss. If a single-path mode is used, the refrigerant flow path will be very long, causing significant pressure loss and hindering the air conditioner's capacity. In multi-path mode, the refrigerant flow path is shortened. The refrigerant flows out of the throttling heat exchanger quickly, and heat exchange is also faster. This allows the air conditioner to utilize its cooling / heating capacity more effectively, thereby improving the air conditioner's energy efficiency.

[0069] If the frequency locking method is intermediate frequency locking, then the target distribution mode is determined to be single-path mode, meaning all heat exchange branches are connected in series. This is because: compared to the rated frequency locking, the operating frequency of intermediate frequency locking is relatively low. Therefore, the system pressure is relatively low. Lower system pressure means less heat exchange by the refrigerant. If a multi-path mode is used, the refrigerant will quickly flow out of the throttling heat exchanger. This would further reduce heat exchange, hindering the air conditioning's capacity. Furthermore, lower system pressure results in less pressure loss. Therefore, reducing pressure loss is not the primary consideration. At this point, the primary consideration is heat exchange. If a single-path mode is used, heat exchange is relatively higher. Therefore, using a single-path mode is more conducive to maximizing the air conditioning's capacity and can effectively improve the air conditioning's energy efficiency.

[0070] In this way, when the outdoor ambient temperature is not high, the optimal target flow distribution mode can be determined based on the different frequency locking methods. This method can effectively improve the energy efficiency of the air conditioner.

[0071] It should be noted that when conducting air conditioner energy efficiency tests, the suitability of single-path mode for cooling and multi-path mode for heating is not considered. Regardless of whether the air conditioner is operating in cooling or heating mode, the target flow distribution mode of the throttling heat exchanger, i.e., the connectivity of each heat exchange branch, is determined based on the above logic (outdoor ambient temperature and frequency locking method). If the outdoor temperature is too high, multi-path mode is more conducive to maximizing capacity. If the outdoor temperature is low, the frequency is relatively high at rated frequency locking, and multi-path mode can effectively facilitate heat exchange. If switching to intermediate frequency locking, single-path mode is more conducive to maximizing capacity. Therefore, adaptive changes in the control flow path at different frequency locking stages are beneficial for better capacity utilization, thereby improving the air conditioner's energy efficiency.

[0072] Optionally, combined Figure 7 As shown in the embodiments of this disclosure, another method for controlling an air conditioner is provided, including:

[0073] S601, the processor obtains the outdoor ambient temperature when the air conditioner is locked at the same frequency.

[0074] S602, the processor determines the target flow splitting mode of the throttling heat exchanger based on the outdoor ambient temperature.

[0075] S613, when the target distribution mode is multi-path mode, the processor controls the first refrigerant circulation loop to disconnect and controls the second refrigerant circulation loop to connect.

[0076] S623, when the target distribution mode is single-path mode, the processor controls the first refrigerant circulation loop to connect and controls the second refrigerant circulation loop to disconnect.

[0077] If the air conditioner is not undergoing energy efficiency testing, it will operate in single-path mode when running in cooling mode and multi-path mode when running in heating mode. If the air conditioner is undergoing energy efficiency testing, the current flow distribution mode can be determined first. Specifically, this can be done by checking the on / off states of the first and second refrigerant circulation loops, i.e., the on / off states of the first, second, third, and fourth on / off valves, the solenoid valve, and the electronic expansion valve. The current flow distribution mode is then compared with the target flow distribution mode. If they match, the first and second refrigerant circulation loops are kept in their current on / off states. If they do not match, the on / off states of the first and second refrigerant circulation loops are switched.

[0078] When the current refrigerant distribution mode differs from the target refrigerant distribution mode, requiring switching the on / off states of two refrigerant circulation loops, the specific switching operation is performed according to the target refrigerant distribution mode. If the target refrigerant distribution mode is a multi-path mode, the target state of each heat exchange branch is parallel connection. In this case, the first and second on / off valves are closed to disconnect the first refrigerant circulation loop. Simultaneously, the third and fourth on / off valves are opened, and the solenoid valve and electronic expansion valve are activated to connect the second refrigerant circulation loop.

[0079] If the target flow distribution mode is a single-path mode, the target state of each heat exchange branch is a series connection state. In this case, the first and second on / off valves are opened, while the solenoid valve and electronic expansion valve are closed, to maintain the connection of the first refrigerant circulation loop. Simultaneously, the third and fourth on / off valves are closed to maintain the disconnection of the second refrigerant circulation loop.

[0080] In this way, by controlling the on / off states of the first on / off valve, the second on / off valve, the third on / off valve, the fourth on / off valve, the solenoid valve, and the electronic expansion valve, the on / off states of the first and second refrigerant circulation loops can be controlled.

[0081] In practical applications, such as Figure 8 As shown:

[0082] S801, the air conditioner is turned on.

[0083] S802, the air conditioner receives the user's frequency lock command.

[0084] S803, the processor obtains the outdoor ambient temperature T w .

[0085] S804, the processor determines whether T is satisfied. w >T n If yes, then execute S805; otherwise, execute S807.

[0086] S805, the processor determines that the target splitting mode is multi-path mode; then, it executes S806.

[0087] S806, the processor controls the first refrigerant circulation loop to disconnect and controls the second refrigerant circulation loop to connect.

[0088] In S807, the processor determines the frequency locking method according to the frequency locking instruction; if the frequency locking method is the rated frequency locking, then S805 is executed; if the frequency locking method is the intermediate frequency locking, then S808 is executed.

[0089] S808, the processor determines that the target splitting mode is single-path mode; then executes S809.

[0090] S809, the processor controls the connection of the first refrigerant circulation loop and controls the disconnection of the second refrigerant circulation loop.

[0091] During the energy efficiency test of the air conditioner, if the compressor oil return is performed, the processor controls the flow distribution mode of the throttling heat exchanger (i.e., the connection status of each heat exchange branch) according to the compressor oil return logic.

[0092] If the processor receives an oil return command before executing S803, it first controls the compressor to return oil. After the oil return is complete, it then executes the previously scheduled steps. For example, if the processor receives an oil return command after executing S802 (the air conditioner receives the user's frequency lock command), it first controls the compressor to return oil. After the oil return is complete, it then executes S803. This is because the compressor requires sufficient oil for lubrication during operation to reduce wear. Failure to return oil will affect the compressor's performance, which in turn will affect the energy efficiency test results. Therefore, compressor oil return should be performed before energy efficiency testing.

[0093] If the processor receives an oil return command while executing S803 and subsequent steps, it first controls the compressor to return oil. After the oil return is complete, S803 is executed again. For example, if the processor receives an oil return command after executing S807, it first controls the compressor to return oil. After the oil return is complete, S803 is executed again. This is because the outdoor temperature may change after the compressor completes the oil return. Therefore, it is necessary to re-determine the relationship between the outdoor environment and the temperature threshold. This method ensures the accuracy of the energy efficiency test results.

[0094] Combination Figure 9 As shown, the following procedure should be followed when performing compressor oil return:

[0095] S901, the processor responds to the compressor oil return command and controls the compressor to operate at a higher frequency.

[0096] S902. When the compressor reaches the frequency threshold, the processor compares the current state of each heat exchange branch with the preset state.

[0097] S903. When the current state is different from the preset state, the processor controls the on / off states of the first refrigerant circulation loop and the second refrigerant circulation loop so that the states of each heat exchange branch meet the preset state.

[0098] S904. The processor obtains the ambient temperature.

[0099] S905. The processor adjusts the opening degree of the throttling device according to the ambient temperature.

[0100] When the compressor performs oil return for the first time, control the compressor to operate at an increased frequency to enable the compressor to return oil. Then control each heat exchange branch to switch back and forth between the parallel connection state and the series connection state. Optionally, perform one or more switches. A first temperature sensor communicatively connected to the processor is provided at the outlet of the condenser. The processor obtains the outlet temperature of the condenser through the first temperature sensor. When performing one switch, record the outlet temperature of the condenser before the switch as T1 and the outlet temperature of the condenser after the switch as T2. Compare the magnitudes of T1 and T2. If T1 > T2, determine the connection state corresponding to the outlet temperature of T1 as the preset state. If T1 < T2, determine the connection state corresponding to the outlet temperature of T2 as the preset state. When performing multiple (n) switches, record the outlet temperatures T 11 、T 12 、T 13 ……T 1n of each time in one connection state, and the outlet temperatures T 21 、T 22 、T 23 ……T 2n of each time in another connection state. Calculate the average values of the outlet temperatures in the two connection states respectively and Compare and in magnitude. If then determine the connection state corresponding to the outlet temperature of as the preset state. If then determine the connection state corresponding to the outlet temperature of The connection state corresponding to a certain time is determined as the preset state. That is, the connection state corresponding to a higher condenser outlet temperature is determined as the preset state. This is because refrigerant and oil are miscible, so there is more oil where there is more refrigerant. Refrigerant accounts for about 60% of the condenser. If a faster oil return speed is required, the refrigerant and oil need to mix together more quickly. This allows the oil and refrigerant to return to the compressor. The condenser outlet temperature reflects the system temperature. The higher the system temperature, the better the refrigerant and oil mix, and the faster the oil return.

[0101] After determining the preset state, the on / off states of the first and second refrigerant circulation loops corresponding to the preset state, namely the on / off states of the first on / off valve, the second on / off valve, the third on / off valve, the fourth on / off valve, the solenoid valve, and the electronic expansion valve, are stored in the processor.

[0102] When the processor responds to the oil return command again, it controls the compressor to operate at a higher frequency to facilitate oil return. By acquiring the on / off states of the first, second, third, and fourth on / off valves, the solenoid valve, and the electronic expansion valve, it determines whether the current state of each heat exchange branch is the same as the preset state. If they are different, it controls the switching of the on / off states of the first and second refrigerant circulation loops to ensure that the state of each heat exchange branch meets the preset state. If they are the same, it controls the first and second refrigerant circulation loops to maintain their current on / off states. When each heat exchange branch is in the preset state, the condenser is kept at a higher temperature, which is more conducive to oil return from the compressor.

[0103] Specifically, if the preset state is a parallel connection state, the first refrigerant circulation loop is disconnected, and the second refrigerant circulation loop is connected. Specifically, the first and second on-off valves are closed to disconnect the first refrigerant circulation loop, while the third and fourth on-off valves are opened, and the solenoid valve and electronic expansion valve are activated to connect the second refrigerant circulation loop. This achieves a parallel connection state for each heat exchange branch. If the preset state is a series connection state, the first refrigerant circulation loop is connected, and the second refrigerant circulation loop is disconnected. Specifically, the first and second on-off valves are opened, and the solenoid valve and electronic expansion valve are closed to connect the first refrigerant circulation loop, while the third and fourth on-off valves are closed to disconnect the second refrigerant circulation loop. This achieves a series connection state for each heat exchange branch.

[0104] Optionally, during the process of controlling the compressor to operate at a higher frequency, when the compressor frequency rises to a frequency threshold f... m Then, it is determined whether the current state of each heat exchange branch is the same as the preset state. Optionally, the frequency threshold f mThe frequency can be 85Hz to 88Hz. When the compressor frequency rises to the frequency threshold, the compressor is in a high-frequency operating state. The compressor is also in a high-frequency operating state when performing oil return. Therefore, when the compressor frequency rises to the frequency threshold, it indicates that the compressor is performing oil return. At this time, determining whether the current state of each heat exchange branch is the same as the preset state can determine whether the current state of each heat exchange branch is conducive to the compressor's rapid oil return.

[0105] A second temperature sensor, connected to the processor, is installed in the indoor environment. After switching the connection status of each heat exchange branch to a preset state, the processor obtains the indoor ambient temperature in real time through the second temperature sensor. The opening degree of the throttling device is adjusted based on the indoor ambient temperature. Optionally, the indoor ambient temperature and the opening degree of the throttling device are positively correlated. The higher the indoor ambient temperature, the larger the opening degree of the throttling device. This is because a larger opening degree of the throttling device results in a smaller throttling effect on the refrigerant, leading to a higher refrigerant temperature, better oil-refrigerant mixing, and thus faster oil return. Furthermore, a higher indoor temperature results in a larger cooling / heating load for the air conditioner, requiring faster oil return to reduce compressor wear. Therefore, adjusting the opening degree of the throttling device based on the ambient temperature is beneficial for matching the cooling / heating load and achieving rapid oil return.

[0106] The processor pre-stores the correlation between ambient temperature and throttling device opening degree. This correlation includes one or more correspondences between ambient temperature and throttling device opening degree. The throttling device opening degree is expressed as a percentage of the maximum opening degree A. When the indoor ambient temperature is in the first temperature range, the throttling device is at the first opening degree. When the indoor ambient temperature is in the second temperature range, the throttling device is at the second opening degree. When the indoor ambient temperature is in the third temperature range, the throttling device is at the third opening degree. When the indoor ambient temperature is in the fourth temperature range, the throttling device is at the fourth opening degree. When the indoor ambient temperature is in the fifth temperature range, the throttling device is at the fifth opening degree. The first, second, third, fourth, and fifth temperature ranges decrease sequentially. The first, second, third, fourth, and fifth opening degrees also decrease sequentially. Based on the correspondence between the temperature range of the indoor ambient temperature and the throttling device opening degree, the target opening degree corresponding to the current indoor ambient temperature is determined. Specifically, the correlation between ambient temperature and throttling device opening degree is shown in Table 1.

[0107] Table 1. Relationship between ambient temperature and throttling device opening degree

[0108] <![CDATA[Indoor environmental temperature T w (°C)]]> Throttling device opening <![CDATA[T w >48℃]]> 80％A <![CDATA[43℃<T w ≤48℃]]> 70％A <![CDATA[35℃<T w ≤43℃]]> 60％A <![CDATA[27℃<T w ≤35℃]]> 50％A <![CDATA[T w ≤25℃]]> 40％A

[0109] For example, if the indoor ambient temperature is 36°C, the target throttling device is set to 60%A, and the processor controls the opening degree of the throttling device to 60%A.

[0110] In this way, the temperature is divided into multiple temperature zones. Each temperature zone corresponds to a different opening degree, ensuring that the target opening degree is matched with the ambient temperature to achieve rapid oil return. Moreover, switching the flow distribution mode of the throttling heat exchanger while controlling the opening degree of the throttling device can better achieve rapid oil return.

[0111] After the compressor has been running for a period of time, such as 3 to 4 minutes, the oil return requirement of the compressor can be met. At this point, it can be determined that the compressor oil return is complete.

[0112] Combination Figure 10 As shown, this embodiment of the disclosure provides an apparatus for controlling an air conditioner, including: an acquisition module 101, a determination module 102, and a control module 103. The acquisition module 101 is configured to acquire the outdoor ambient temperature when the air conditioner is frequency locked. The determination module 102 is configured to determine a target flow distribution mode for the throttling heat exchanger based on the outdoor ambient temperature. The control module 103 is configured to control the on / off state of the first refrigerant circulation loop and the second refrigerant circulation loop based on the target flow distribution mode.

[0113] The device for controlling an air conditioner provided in this disclosure recognizes that outdoor ambient temperature affects refrigerant heat exchange, thus impacting the air conditioner's energy efficiency. Different flow distribution modes also have varying effects on refrigerant heat exchange and pressure loss. Therefore, by matching a suitable flow distribution mode based on the outdoor ambient temperature, the refrigerant's heat exchange and / or pressure loss can be optimized to a more suitable state. Furthermore, the on / off states of the first and second refrigerant circulation loops are controlled to ensure the throttling heat exchanger meets the target flow distribution mode, thereby improving the air conditioner's energy efficiency. Moreover, this method of improving energy efficiency is compatible with the variable flow distribution capability of the throttling heat exchanger. This achieves the goal of providing a suitable method for improving energy efficiency for air conditioners with updated structures.

[0114] Combination Figure 11 As shown, this disclosure provides an apparatus for controlling an air conditioner, including a processor 110 and a memory 111. Optionally, the apparatus may further include a communication interface 112 and a bus 113. The processor 110, communication interface 112, and memory 111 can communicate with each other via the bus 113. The communication interface 112 can be used for information transmission. The processor 110 can call logical instructions in the memory 111 to execute the method for controlling the air conditioner described in the above embodiment.

[0115] Furthermore, the logic instructions in the aforementioned memory 111 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0116] The memory 111, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 110 executes functional applications and data processing by running the program instructions / modules stored in the memory 111, that is, it implements the method for controlling the air conditioner in the above embodiments.

[0117] The memory 111 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 111 may include high-speed random access memory and may also include non-volatile memory.

[0118] This disclosure provides an air conditioner that includes the above-described device for controlling the air conditioner.

[0119] This disclosure provides a storage medium storing computer-executable instructions configured to perform the above-described method for controlling an air conditioner.

[0120] The aforementioned storage medium can be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0121] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0122] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0123] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0124] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling an air conditioner, the air conditioner comprising: Throttle heat exchanger; characterized in that the air conditioner further includes: a first refrigerant circulation loop and a second refrigerant circulation loop sharing the throttle heat exchanger; by switching the on / off states of the first refrigerant circulation loop and the second refrigerant circulation loop, the throttle heat exchanger can be switched between different flow splitting modes; the throttle heat exchanger includes: multiple heat exchange branches, and the number of heat exchange branches corresponding to different flow splitting modes is different; the method includes: When the air conditioner is frequency-locked, obtain the outdoor ambient temperature; Determine the target flow splitting mode of the throttle heat exchanger according to the outdoor ambient temperature; Control the on / off states of the first refrigerant circulation loop and the second refrigerant circulation loop according to the target flow splitting mode; If an oil return instruction is received, control the compressor to return oil; wherein, the control of the compressor to return oil includes: in response to the compressor oil return instruction, control the compressor to operate at an increased frequency; when the compressor reaches the frequency threshold, compare the current states of each heat exchange branch with the preset states; when the current state is different from the preset state, control the on / off states of the first refrigerant circulation loop and the second refrigerant circulation loop so that the states of each heat exchange branch meet the preset states; obtain the ambient temperature; adjust the opening degree of the throttle device according to the ambient temperature; After the oil return is completed, obtain the outdoor ambient temperature; Wherein, the determination of the preset state includes: When the compressor first returns oil, control the compressor to operate at an increased frequency to make the compressor return oil; control each heat exchange branch to switch back and forth between the parallel connection state and the series connection state; when a switch is made, record the outlet temperature of the condenser before the switch as T1 and the outlet temperature of the condenser after the switch as T2; if T1>T2, determine the connection state corresponding to T1 as the preset state; if T1<T2, determine the connection state corresponding to T2 as the preset state; or, When multiple switches are performed, record the outlet temperature of each condenser in one connected state and the outlet temperature of each condenser in another connected state; calculate the average outlet temperature for each of the two connected states. and ;if > Then the outlet temperature will be The connection state corresponding to the time is determined as the preset state; if < Then the outlet temperature will be The connection state corresponding to the time is determined as the preset state.

2. The method according to claim 1, characterized in that, The determination of the frequency-locking method includes: Determine the frequency-locking method according to the user's frequency-locking instruction.

3. The method according to claim 2, characterized in that, The larger the refrigeration / heating parameter corresponding to the frequency-locking method, the more heat exchange branches corresponding to the target flow splitting mode, including: When the frequency-locking method is rated frequency-locking, determine the target flow splitting mode as the multi-way mode; When the frequency-locking method is intermediate frequency-locking, determine the target flow splitting mode as the single-way mode; Wherein, the refrigeration / heating parameter corresponding to the rated frequency-locking is greater than the refrigeration / heating parameter corresponding to the intermediate frequency-locking.

4. The method according to any one of claims 1 to 3, characterized in that, When the target flow splitting mode is the multi-way mode, the control of the on / off states of the first refrigerant circulation loop and the second refrigerant circulation loop according to the target flow splitting mode includes: Control the first refrigerant circulation loop to be disconnected; and Control the second refrigerant circulation loop to be connected.

5. The method according to any one of claims 1 to 3, characterized in that, When the target flow splitting mode is the single-way mode, the control of the on / off states of the first refrigerant circulation loop and the second refrigerant circulation loop according to the target flow splitting mode includes: Control the first refrigerant circulation loop to be connected; and Control the second refrigerant circulation loop to be disconnected.

6. The method according to any one of claims 1 to 3, characterized in that, The adjustment of the opening degree of the throttle device according to the ambient temperature includes: ​ 7. A device for controlling an air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when executing the program instructions, perform the method for controlling an air conditioner as described in any one of claims 1 to 6.

8. An air conditioner, the air conditioner comprising: A throttling heat exchanger; characterized in that the air conditioner further includes: The first and second refrigerant circulation loops of the throttling heat exchanger are shared; by switching the on / off states of the first and second refrigerant circulation loops, the throttling heat exchanger can switch between different flow splitting modes; and, The device for controlling an air conditioner as described in claim 7.

9. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the method for controlling the air conditioner as described in any one of claims 1 to 6.

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