Control method of air conditioner, air conditioner and storage medium

Abstract

The invention discloses a control method of an air conditioner, the air conditioner and a storage medium, and relates to the technical field of air conditioners, the method comprises the following steps: controlling a compressor in the air conditioner to operate at an oil return frequency under the condition that the air conditioner operates to meet an oil return condition; and under the condition that the compressor operates at the oil return frequency to meet the preset condition, the air conditioner is controlled to operate so that the superheat degree of exhaust of the compressor can be larger than or equal to the target superheat degree. And the air conditioner is controlled to restore to the state before the oil return condition is met for operation. The invention aims to improve the operation reliability of the compressor.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to a control method of an air conditioner, an air conditioner, and a storage medium. Background Art

[0002] During air conditioner operation, the compressor drives the refrigerant to circulate. As the refrigerant passes through the indoor heat exchanger, it exchanges heat with the indoor air to regulate the indoor environment. The compressor typically requires compressor oil for lubrication. If the oil return condition is triggered during compressor operation, oil return control is typically required to restore the compressor to its original operating state.

[0003] In the related art, when the bottom superheat of the compressor is low before the compressor starts to return oil, the compressor returns to its original state after the oil return operation, which may cause the bottom pressure temperature, which is not high to begin with, to further deteriorate, and there is a risk of compressor liquid return and lubricating oil dilution, affecting the reliability of the compressor operation. Summary of the Invention

[0004] The main purpose of this application is to provide a control method for an air conditioner, an air conditioner and a storage medium, aiming to improve the operating reliability of the compressor.

[0005] To achieve the above objectives, the present application proposes a method for controlling an air conditioner, the method comprising:

[0006] When the air conditioner is running to meet the oil return condition, controlling the compressor in the air conditioner to operate at the oil return frequency;

[0007] When the compressor operates at the oil return frequency until a preset condition is satisfied, controlling the air conditioner to operate so that the bottom superheat of the compressor is greater than or equal to a target superheat;

[0008] The air conditioner is controlled to return to a state before the oil return condition is met.

[0009] In one embodiment, the air conditioner includes the compressor and a first heat exchanger, an electronic expansion valve, and a second heat exchanger connected in sequence. The step of controlling the operation of the air conditioner so that the bottom superheat of the compressor is greater than or equal to a target superheat comprises:

[0010] The electronic expansion valve is controlled to reduce its opening, and / or the compressor is controlled to adjust its frequency so that the superheat of the compressor exhaust gas is greater than or equal to the exhaust gas superheat threshold corresponding to the target superheat.

[0011] In one embodiment, the step of controlling the operation of the air conditioner so that the bottom superheat of the compressor is greater than or equal to a target superheat comprises:

[0012] controlling the electronic expansion valve to reduce its opening;

[0013] When the electronic expansion valve decreases its opening to a preset opening, the compressor is controlled to adjust its frequency so that the superheat of the compressor exhaust gas is greater than or equal to an exhaust gas superheat threshold corresponding to the target superheat.

[0014] In one embodiment, the step of controlling the compressor to adjust the frequency so that the superheat of the compressor exhaust is greater than or equal to the exhaust superheat threshold corresponding to the target superheat comprises:

[0015] controlling the compressor to operate at a first frequency to obtain an actual superheat of the compressor;

[0016] controlling the compressor to adjust the operating frequency according to the actual superheat and the exhaust superheat threshold;

[0017] Wherein, the first frequency is less than the oil return frequency.

[0018] In one embodiment, after the step of controlling the compressor to adjust the frequency so that the superheat of the compressor exhaust gas is greater than or equal to the exhaust gas superheat threshold corresponding to the target superheat when the electronic expansion valve decreases its opening to a preset opening, the method further includes:

[0019] When the superheat degree of the compressor exhaust gas is greater than or equal to the exhaust gas superheat degree threshold, controlling the compressor to maintain the current frequency operation;

[0020] When the superheat of the compressor exhaust is greater than or equal to the exhaust superheat threshold and the duration of maintenance is greater than or equal to a first duration, the step of controlling the air conditioner to return to the state before the oil return condition is met is performed.

[0021] In one embodiment, the oil return condition includes an oil return start condition; or,

[0022] The oil return condition includes an oil return start condition and a preset risk condition, wherein the preset risk condition indicates that when the air conditioner ends the oil return operation during the operation of the compressor at the oil return frequency, the compressor's bottom pressure superheat is less than the target superheat.

[0023] In one embodiment, the oil return start condition includes that the operating frequency of the compressor is less than a preset frequency and the duration is greater than or equal to a second duration; and / or,

[0024] The preset risk condition includes that the current exhaust superheat of the compressor is less than the preset superheat, or the current exhaust superheat of the compressor is less than the preset superheat and is maintained for a period greater than or equal to a third period.

[0025] In one embodiment, when the oil return condition includes an oil return start condition and a preset risk condition, the air conditioner control method further includes:

[0026] When the air conditioner is running until the oil return start condition is met and the preset risk condition is not met, controlling the compressor to operate at the oil return frequency;

[0027] When the compressor operates at the oil return frequency until the preset condition is met, the air conditioner is controlled to return to the state before the oil return condition is met.

[0028] In addition, to achieve the above-mentioned purpose, the present application also proposes an air conditioner, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the air conditioner control method as described above.

[0029] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium. A computer program is stored on the storage medium, and when the computer program is executed by the processor, the steps of the air conditioner control method as described above are implemented.

[0030] One or more technical solutions proposed in the present application have at least the following technical effects: after the compressor operates at the oil return frequency, the solution controls the operation of the air conditioner to increase the bottom superheat of the compressor to a target superheat and then restores the operation to its original state, so that the bottom superheat of the compressor is sufficiently high after the oil return is completed, which is conducive to avoiding the risk of compressor liquid return and lubricating oil dilution caused by excessively low bottom superheat of the compressor after the oil return is completed, and effectively improves the reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 This is a schematic structural diagram of a refrigerant circulation system in an embodiment of an air conditioner of the present application;

[0034] Figure 2 Schematic diagram of the device structure of the hardware operating environment involved in the air conditioner control method in the embodiment of the present application;

[0035] Figure 3 A flow chart of a first embodiment of the air conditioner control method of the present application;

[0036] Figure 4 This is a flow chart of the second embodiment of the air conditioner control method of the present application.

[0037] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0039] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0040] The main solution of the embodiment of the present application is: when the air conditioner runs to meet the oil return condition, the compressor in the air conditioner is controlled to run at the oil return frequency; when the compressor runs at the oil return frequency to meet the preset condition, the air conditioner is controlled to run so that the bottom superheat of the compressor is greater than or equal to the target superheat; the air conditioner is controlled to return to the state before the oil return condition is met.

[0041] In this embodiment, for ease of description, the following description is made with the air conditioner as the execution subject.

[0042] Because in the related art, when the bottom superheat of the compressor is low before the compressor starts to return oil, the compressor may return to its original state after the oil return operation, which may cause the bottom pressure temperature, which is not high to begin with, to further deteriorate. There is a risk of compressor liquid return and lubricating oil dilution, which affects the reliability of the compressor operation.

[0043] The present application provides the above-mentioned solution. After the compressor operates at the oil return frequency, the air conditioner is controlled to operate so as to bring the bottom superheat of the compressor to the target superheat and then resume operation in the original state, so that the bottom superheat of the compressor is sufficiently high after the oil return is completed, which is conducive to avoiding the risk of compressor liquid return and lubricating oil dilution caused by excessively low bottom superheat of the compressor after the oil return is completed, and effectively improving the reliability of the compressor.

[0044] The present application provides an air conditioner, which may be any type of air conditioner, such as a wall-mounted air conditioner, a floor-standing air conditioner, a window air conditioner, a ceiling-mounted air conditioner, or a multi-split air conditioner.

[0045] In this embodiment, referring to Figure 1The air conditioner includes a compressor 1 and an indoor heat exchanger 2, a throttling device 3 and an outdoor heat exchanger 4 connected in sequence.

[0046] The indoor heat exchanger 2 is provided with an indoor fan 5 corresponding to the indoor heat exchanger 2, and the indoor fan 5 can drive the indoor air to exchange heat with the indoor heat exchanger 2. The outdoor heat exchanger 4 is provided with an outdoor fan 6 corresponding to the outdoor heat exchanger 4, and the outdoor fan 6 can drive the outdoor air to exchange heat with the outdoor heat exchanger 4.

[0047] In this embodiment, the throttling device 3 is an electronic expansion valve.

[0048] In one implementation, the exhaust port of the compressor 1, the indoor heat exchanger 2, the throttling device 3, the outdoor heat exchanger 4 and the return air port of the compressor 1 are connected in sequence. When the compressor 1 is turned on, the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 2, the throttling device 3 and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1, and the indoor heat exchanger 2 is in a condensing state.

[0049] In another implementation, the exhaust port of the compressor 1, the outdoor heat exchanger 4, the throttling device 3, the indoor heat exchanger 2 and the return air port of the compressor 1 are connected in sequence. When the compressor 1 is turned on, the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the throttling device 3 and the indoor heat exchanger 2 in sequence and then flows back to the compressor 1, and the indoor heat exchanger 2 is in an evaporating state.

[0050] In another implementation, referring to Figure 1 The air conditioner also includes a reversing component 7 (such as a four-way valve, etc.), the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor heat exchanger 2 and the outdoor heat exchanger 4 are all connected to the reversing component 7, and the reversing component 7 has a first operating state and a second operating state. When the reversing component 7 is in the first operating state, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 4 and the return air port of the compressor 1 is connected to the indoor heat exchanger 2. When the compressor 1 is turned on, the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the throttling device 3 and the indoor heat exchanger 2 in sequence and then flows back to the compressor 1, and the indoor heat exchanger 2 is in an evaporating state; when the reversing component 7 is in the second operating state, the exhaust port of the compressor 1 is connected to the indoor heat exchanger 2 and the return air port of the compressor 1 is connected to the outdoor heat exchanger 4. When the compressor 1 is turned on, the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 2, the throttling device 3 and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1, and the indoor heat exchanger 2 is in a condensing state.

[0051] In a feasible implementation, referring to Figure 2 The air conditioner further includes a temperature sensor 8 , which is disposed on the exhaust side of the compressor 1 to detect the exhaust temperature of the compressor 1 .

[0052] Reference Figure 2The air conditioner further includes a control device 100 , and the above-mentioned compressor 1 , indoor fan 5 , outdoor fan 6 , reversing component 7 , temperature sensor 8 and throttling device 3 are all communicatively connected to the control device 100 .

[0053] The control device 100 includes: at least one processor 1001; and a memory 1002 connected to the at least one processor 1001 for communication, and a timer 1003, etc.; wherein the memory 1002 stores instructions that can be executed by at least one processor 1001, and the instructions are executed by at least one processor 1001 so that at least one processor 1001 can execute the control method of the air conditioner in the following embodiment.

[0054] Reference below Figure 2 , which shows a schematic structural diagram of a control device 100 suitable for implementing an embodiment of the present application. The control device 100 in the embodiment of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 2 The control device 100 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0055] like Figure 2As shown, the control device 100 may include a processor 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in memory 1002. The programs in memory 1002 may be programs in read-only memory (ROM) or programs loaded from a storage device into random access memory (RAM). The RAM also stores various programs and data required for the operation of the control device 100. The processor 1001 and memory 1002 (ROM and RAM) are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus. Typically, the following systems can be connected to the I / O interface: input devices such as a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices such as a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices such as magnetic tape and hard disk; and communication devices. The communication devices can allow the control device 100 to communicate with other devices wirelessly or wired to exchange data. Although the control device 100 is shown with various systems, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have instead.

[0056] In particular, according to the embodiments disclosed in this application, the method flow described in the following embodiments can be implemented as a computer software program. For example, the embodiments disclosed in this application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network via a communication device, or installed from the memory 1002. When the computer program is executed by the processor 1001, the above-mentioned functions defined in the control method of the air conditioner in the embodiment disclosed in this application are performed.

[0057] The air conditioner provided in this application, utilizing the air conditioner control method described in the following embodiments, can solve the technical problem of improving compressor operating reliability. Compared to the prior art, the beneficial effects of the air conditioner provided in this application are the same as those of the air conditioner control method described in the following embodiments. Other technical features of this air conditioner are the same as those disclosed in the following embodiments and are not further described here.

[0058] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, mobile phone, etc., or an electronic device capable of implementing the above functions, such as an air conditioner. The following uses an air conditioner as an example to illustrate this embodiment and the following embodiments.

[0059] Based on this, the embodiment of the present application provides a method for controlling an air conditioner, referring to Figure 3 , Figure 3 This is a flow chart of the first embodiment of the air conditioner control method of the present application.

[0060] In this embodiment, the air conditioner control method includes steps S10 to S30:

[0061] Step S10, when the air conditioner is running to meet the oil return condition, controlling the compressor in the air conditioner to operate at the oil return frequency;

[0062] During the operation of the air conditioner, the compressor is in the on state, the indoor heat exchanger can be in the condensing state or the evaporating state, and the operating frequency of the compressor can be adjusted according to the load demand parameters. When it is determined that the oil return conditions are met during operation, the air conditioner can enter the oil return operation.

[0063] The oil return frequency is greater than a preset frequency, which can be [50%, 80%] of the compressor's maximum frequency. This means the compressor operates at a high frequency, which drives compressor oil deposited in the refrigerant circulation loop back into the compressor. The oil return frequency can be a preset fixed frequency or a frequency determined based on the air conditioner's actual state. For example, the oil return frequency can be determined based on the temperature of the heat exchanger in the evaporating state and / or the frequency at which the compressor operates before the oil return condition is met.

[0064] In this embodiment, step S10 is performed when the air conditioner is in a cooling state, in which the indoor heat exchanger is in an evaporating state.

[0065] Step S20, when the compressor operates at the oil return frequency until a preset condition is satisfied, controlling the air conditioner to operate so that the bottom superheat of the compressor is greater than or equal to a target superheat;

[0066] The preset condition indicates that oil return is complete. In this embodiment, the preset condition includes the compressor operating at the oil return frequency for a period greater than or equal to a second period. In other implementations, the preset condition may also include the oil level in the compressor being greater than a preset height, etc.

[0067] Bottom superheat is the difference between the compressor bottom temperature and the condensing temperature. Bottom superheat can be measured by measuring the compressor bottom temperature or the compressor discharge superheat.

[0068] The target superheat is the minimum base superheat allowed for the compressor to operate reliably when the air conditioner returns to the state before meeting the oil return condition.

[0069] The target superheat can be a pre-set fixed opening, or an opening determined according to the actual operating conditions of the air conditioner. For example, the target superheat can be determined based on the shell temperature of the compressor when the oil return frequency runs to a preset condition and / or the initial bottom superheat of the compressor when the oil return condition is met and / or the ambient temperature of the environment where the air conditioner is located (such as the outdoor ambient temperature, etc.) and / or the compressor operating frequency when the compressor meets the oil return condition, etc.

[0070] In this embodiment, the compressor's bottom superheat can be adjusted by at least one of the following methods: adjusting the opening of the electronic expansion valve, adjusting the compressor's operating frequency, adjusting the fan speed, adjusting the operating state of the oil return valve, adjusting the operating state of the air supply valve, etc. In this embodiment, the electronic expansion valve is controlled to decrease its opening, and / or the compressor's frequency is controlled to adjust so that the compressor exhaust gas superheat is greater than or equal to the exhaust gas superheat threshold corresponding to the target superheat. The exhaust gas superheat threshold is set to the minimum superheat required for the compressor's bottom superheat to be greater than or equal to the target superheat.

[0071] In this embodiment, at least one of the compressor, electronic expansion valve, fan speed, oil return valve, air supply valve, etc. can be controlled to operate according to the bottom superheat of the compressor and / or the exhaust superheat of the compressor, so that the bottom superheat of the compressor is greater than or equal to the target superheat.

[0072] Step S30: Control the air conditioner to return to the state before the oil return condition is met.

[0073] When the exhaust superheat of the compressor reaches the target superheat, the operation of the air conditioner is restored to be controlled according to the load demand parameters, and the operation of the compressor, electronic expansion valve, fan and other components in the air conditioner is restored to be controlled according to the load demand parameters.

[0074] This embodiment provides a control method for an air conditioner. After the compressor operates at the oil return frequency, the air conditioner is controlled to operate so as to increase the bottom superheat of the compressor to a target superheat and then resume operation in its original state. This ensures that the bottom superheat of the compressor is sufficiently high after the oil return is completed. This helps to avoid the risk of compressor liquid return and lubricating oil dilution caused by excessively low bottom superheat of the compressor after the oil return is completed, thereby effectively improving the reliability of the compressor.

[0075] In one feasible embodiment, the air conditioner includes the compressor and a first heat exchanger, an electronic expansion valve, and a second heat exchanger connected in sequence. In this embodiment, the first heat exchanger is the indoor heat exchanger described above, and the second heat exchanger is the outdoor heat exchanger described above. The step of controlling the operation of the air conditioner so that the base superheat of the compressor is greater than or equal to a target superheat comprises: controlling the electronic expansion valve to reduce its opening; and, when the electronic expansion valve is reduced to a preset opening, controlling the compressor to adjust its frequency so that the superheat of the compressor exhaust gas is greater than or equal to an exhaust gas superheat threshold corresponding to the target superheat.

[0076] The preset opening can be a fixed opening set in advance, or can be an opening determined according to the actual operation of the air conditioner. In this embodiment, the preset opening is the minimum opening allowed for the current reliable operation of the air conditioner.

[0077] The electronic expansion valve reduces its opening to a preset opening, so that the exhaust gas superheat of the compressor is greater than the exhaust gas superheat threshold.

[0078] The compressor frequency can be adjusted to decrease or increase the frequency until the compressor exhaust superheat is greater than or equal to the exhaust superheat threshold. In this embodiment, the compressor frequency is adjusted based on the relationship between the actual compressor superheat and the exhaust superheat threshold until the compressor exhaust superheat is greater than or equal to the exhaust superheat threshold. If the actual superheat is less than the exhaust superheat threshold, the compressor can be controlled to increase the operating frequency; if the actual superheat is greater than the exhaust superheat threshold, the compressor can be controlled to decrease the operating frequency.

[0079] The frequency adjustment parameter in the process of compressor frequency adjustment can be a pre-set fixed parameter, or a parameter determined according to the actual operating conditions of the air conditioner. For example, the frequency adjustment parameter can be determined based on the deviation value between the exhaust superheat threshold and the actual superheat; or, a preset frequency adjustment ratio can be determined as the frequency adjustment parameter.

[0080] In this embodiment, the opening of the electronic expansion valve is first reduced to a preset opening and then the compressor is controlled to adjust the frequency so that the exhaust superheat can reach the exhaust superheat threshold required for the bottom superheat to reach the target superheat. In this way, the reduction in the opening of the electronic expansion valve is conducive to a rapid increase in the bottom superheat of the compressor. The adjustable range of the compressor frequency can also be increased by reducing the opening of the electronic expansion valve, ensuring that the bottom superheat can reach the target superheat through the cooperation of the compressor and the electronic expansion valve, and is conducive to the compressor operating frequency being able to be reduced in advance before resuming normal operation, ensuring that the bottom superheat of the compressor can stably reach the target superheat after the air conditioner resumes normal operation, thereby further improving the reliability of the compressor.

[0081] In a feasible embodiment, the step of controlling the compressor to adjust the frequency so that the superheat of the compressor exhaust is greater than or equal to the exhaust superheat threshold corresponding to the target superheat includes: controlling the compressor to operate at a first frequency to obtain the actual superheat of the compressor; controlling the compressor to adjust the operating frequency according to the actual superheat and the exhaust superheat threshold; wherein, the first frequency is less than the oil return frequency.

[0082] The actual superheat is the difference between the compressor exhaust temperature and the saturation temperature corresponding to the current exhaust pressure.

[0083] The first frequency may be a preset fixed frequency or a frequency determined based on the actual operating conditions of the air conditioner. For example, it may be determined based on at least one of the oil return frequency, a preset opening degree, and the compressor base superheat when a preset condition is met. For example, a frequency adjustment value may be determined based on the difference between the compressor base superheat when the preset condition is met and a target superheat, and the oil return frequency may be corrected based on the frequency adjustment value to obtain the first frequency.

[0084] In this embodiment, after the compressor is first reduced in frequency to the first frequency, the exhaust superheat of the compressor is adjusted to above the exhaust superheat threshold based on the first frequency. This is beneficial to shorten the time required for the bottom superheat of the compressor to reach the target superheat, so that the air conditioner can resume normal operation as soon as possible, improving the operating reliability of the compressor while ensuring the heat exchange effect of the air conditioner.

[0085] In other embodiments, the compressor frequency may be adjusted by initial frequency control when the opening of the electronic expansion valve reaches a preset opening, so that the exhaust gas superheat is greater than or equal to the exhaust gas superheat threshold.

[0086] In a feasible embodiment, after the step of controlling the compressor to adjust the frequency so that the superheat of the compressor exhaust is greater than or equal to the exhaust superheat threshold corresponding to the target superheat when the electronic expansion valve reduces its opening to a preset opening, the method further includes:

[0087] When the superheat degree of the compressor exhaust gas is greater than or equal to the exhaust gas superheat degree threshold, controlling the compressor to maintain the current frequency operation;

[0088] When the superheat of the compressor exhaust is greater than or equal to the exhaust superheat threshold and the duration of maintenance is greater than or equal to a first duration, the step of controlling the air conditioner to return to the state before the oil return condition is met is performed.

[0089] The first duration may be a preset fixed duration, or may be determined according to the actual situation of the air conditioner, for example, according to the current frequency of the compressor and / or the ambient temperature of the environment where the air conditioner is located.

[0090] In this embodiment, the above method is used to ensure that the air conditioner system has sufficient response time so that the bottom superheat of the compressor can reach above the target superheat when the air conditioner resumes normal operation, thereby further improving the reliability of the compressor operation.

[0091] In other embodiments, the step of controlling the air conditioner to return to the state before the oil return condition is met may also be performed when the superheat of the compressor exhaust is greater than or equal to the exhaust superheat threshold.

[0092] Based on any of the above embodiments, the oil return condition includes an oil return start condition, which may be a condition that needs to be satisfied by the operating parameters of the air conditioner itself and / or the environmental parameters of the environment in which the air conditioner is located when the compressor has an oil return demand.

[0093] In this embodiment, the oil return start condition includes that the operating frequency of the compressor is less than a preset frequency and is maintained for a time period greater than or equal to a second time period, and the preset frequency is less than the above-mentioned oil return frequency.

[0094] Among them, long-term low-frequency operation of the compressor will cause insufficient superheat at the bottom of the compressor. If the compressor returns oil at a higher oil return frequency and then directly resumes low-frequency operation, the compressor's originally low bottom superheat will be further reduced.

[0095] In this embodiment, when the air conditioner runs to the above oil return start condition, the compressor bottom superheat is established in the above manner after the oil is returned and then normal operation is resumed, which is beneficial to improving the operating reliability of the compressor after the oil return.

[0096] In other embodiments, the oil return start condition may also include that the compressor continues to operate for a time period greater than or equal to a set time period.

[0097] Based on any of the above embodiments, the oil return condition includes an oil return start condition and a preset risk condition, wherein the preset risk condition indicates that when the air conditioner ends the oil return operation during the operation of the compressor at the oil return frequency, the bottom pressure superheat of the compressor is less than the target superheat, and the oil return start condition may be the conditions that need to be met by the operating parameters of the air conditioner itself and / or the environmental parameters of the environment in which the air conditioner is located when the compressor has an oil return demand.

[0098] Meeting the preset risk conditions indicates that the compressor has reliability risks.

[0099] Here, ending the oil return operation refers to returning to the state before the oil return condition is met.

[0100] In this embodiment, the preset risk condition includes the current exhaust gas superheat of the compressor being less than a preset superheat, or the current exhaust gas superheat of the compressor being less than the preset superheat and maintained for a period greater than or equal to a third time period. The preset superheat is less than or equal to the exhaust gas superheat threshold.

[0101] In this embodiment, when the oil return start-up conditions are met and it is determined through the exhaust superheat that there is a reliability risk in resuming normal operation of the compressor under the oil return frequency state, the compressor bottom superheat is established in the above-mentioned manner before normal operation is resumed, which is beneficial to improving the operating reliability of the compressor after oil return.

[0102] In other embodiments, the preset risk condition may also include the bottom temperature of the compressor being less than a preset temperature, and so on.

[0103] Based on any of the above embodiments, in the second embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and no further details will be given later. On this basis, when the oil return condition includes the oil return start condition and the preset risk condition, refer to Figure 4 , the air conditioner control method further includes:

[0104] Step S100, when the air conditioner is running and the oil return start condition is met and the preset risk condition is not met, controlling the compressor to operate at the oil return frequency;

[0105] In step S200 , when the compressor operates at the oil return frequency until the preset condition is met, the air conditioner is controlled to return to the state before the oil return condition is met.

[0106] If the air conditioner does not meet the oil return start condition, the air conditioner maintains the current state of operation.

[0107] In this embodiment, when the oil return start-up conditions are met and it is determined by the exhaust superheat that there is no reliability risk in the compressor resuming normal operation under the oil return frequency, the compressor will directly resume normal operation after running at the oil return frequency to meet the preset conditions in the above manner. This can ensure the reliability of the compressor operation and shorten the time required for the air conditioner to resume normal heat exchange after oil return, which is beneficial to ensuring the reliability of the compressor operation while ensuring the heat exchange effect of the air conditioner.

[0108] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the control method of the air conditioner of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0109] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer program) stored thereon, and the computer-readable program instructions are used to execute the control method of the air conditioner in the above embodiment.

[0110] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0111] The computer-readable storage medium may be included in the air conditioner, or may exist independently without being assembled into the air conditioner.

[0112] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the air conditioner, the air conditioner executes the following process: when the air conditioner runs to meet the oil return condition, the compressor in the air conditioner is controlled to run at the oil return frequency; when the compressor runs at the oil return frequency to meet the preset condition, the air conditioner is controlled to run so that the bottom superheat of the compressor is greater than or equal to the target superheat; and the air conditioner is controlled to return to the state before the oil return condition is met.

[0113] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0114] The computer-readable storage medium provided in this application stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned air conditioner control method, thereby solving the technical problem of improving compressor operating reliability. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the air conditioner control method provided in the aforementioned embodiment, and are not further elaborated here.

[0115] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code includes one or more executable instructions for realizing the prescribed logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented using a dedicated hardware-based system that performs the prescribed function or operation, or can be implemented using a combination of dedicated hardware and computer instructions.

[0116] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. The modules described in the embodiments of this application can be implemented using software or hardware. The name of a module does not, in some cases, constitute a limitation on the unit itself. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any appropriate manner in any one or more embodiments or examples.

[0117] The above descriptions are merely some embodiments of the present application and are not intended to limit the scope of the present application. Any equivalent structural transformations made within the technical concept of the present application using the contents of the present specification and drawings, or any direct or indirect application in other related technical fields, are included within the scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A method for controlling an air conditioner, characterized in that: The control method of the air conditioner includes: When the air conditioner is running to meet the oil return condition, controlling the compressor in the air conditioner to operate at the oil return frequency; When the compressor operates at the oil return frequency until a preset condition is satisfied, controlling the air conditioner to operate so that the bottom superheat of the compressor is greater than or equal to a target superheat; The air conditioner is controlled to return to a state before the oil return condition is met.

2. The air conditioner control method according to claim 1, wherein: The air conditioner includes the compressor and a first heat exchanger, an electronic expansion valve, and a second heat exchanger connected in sequence. The step of controlling the operation of the air conditioner so that the bottom superheat of the compressor is greater than or equal to a target superheat comprises: The electronic expansion valve is controlled to reduce its opening, and / or the compressor is controlled to adjust its frequency so that the superheat of the compressor exhaust gas is greater than or equal to the exhaust gas superheat threshold corresponding to the target superheat.

3. The air conditioner control method according to claim 2, wherein: The step of controlling the operation of the air conditioner so that the bottom superheat of the compressor is greater than or equal to the target superheat comprises: controlling the electronic expansion valve to reduce its opening; When the electronic expansion valve decreases its opening to a preset opening, the compressor is controlled to adjust its frequency so that the superheat of the compressor exhaust gas is greater than or equal to an exhaust gas superheat threshold corresponding to the target superheat.

4. The air conditioner control method according to claim 3, wherein: The step of controlling the compressor to adjust the frequency so that the superheat of the compressor exhaust is greater than or equal to the exhaust superheat threshold corresponding to the target superheat comprises: controlling the compressor to operate at a first frequency to obtain an actual superheat of the compressor; controlling the compressor to adjust the operating frequency according to the actual superheat and the exhaust superheat threshold; Wherein, the first frequency is less than the oil return frequency.

5. The air conditioner control method according to claim 3, wherein: After the step of controlling the compressor to adjust the frequency so that the superheat of the compressor exhaust gas is greater than or equal to the exhaust gas superheat threshold corresponding to the target superheat when the electronic expansion valve decreases its opening to a preset opening, the method further includes: When the superheat degree of the compressor exhaust gas is greater than or equal to the exhaust gas superheat degree threshold, controlling the compressor to maintain the current frequency operation; When the superheat of the compressor exhaust is greater than or equal to the exhaust superheat threshold and the duration of maintenance is greater than or equal to a first duration, the step of controlling the air conditioner to return to the state before the oil return condition is met is performed.

6. The air conditioner control method according to any one of claims 1 to 5, characterized in that: The oil return condition includes an oil return start condition; or The oil return condition includes an oil return start condition and a preset risk condition, wherein the preset risk condition indicates that when the air conditioner ends the oil return operation during the operation of the compressor at the oil return frequency, the compressor's bottom pressure superheat is less than the target superheat.

7. The air conditioner control method according to claim 6, wherein: The oil return start condition includes that the operating frequency of the compressor is less than a preset frequency and the duration is greater than or equal to a second duration; and / or, The preset risk condition includes that the current exhaust superheat of the compressor is less than the preset superheat, or the current exhaust superheat of the compressor is less than the preset superheat and is maintained for a period greater than or equal to a third period.

8. The air conditioner control method according to claim 6, wherein: In the case where the oil return condition includes an oil return start condition and a preset risk condition, the air conditioner control method further includes: When the air conditioner is running until the oil return start condition is met and the preset risk condition is not met, controlling the compressor to operate at the oil return frequency; When the compressor operates at the oil return frequency until the preset condition is met, the air conditioner is controlled to return to the state before the oil return condition is met.

9. An air conditioner, characterized in that: The air conditioner includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the air conditioner control method according to any one of claims 1 to 8.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the air conditioner control method according to any one of claims 1 to 8 are implemented.

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