Control method and control device of air conditioner, and air conditioner

Abstract

The application relates to the technical field of air conditioners, and provides an air conditioner control method, an air conditioner control device and an air conditioner. The air conditioner control method comprises the following steps: when an instruction of running an enthalpy-increasing mode is received and a compressor meets preset conditions of entering the enthalpy-increasing mode, an electromagnetic valve of an enthalpy-increasing pipeline is controlled to be opened, and the electronic expansion valve is controlled to be opened after a first preset time length. The electromagnetic valve of the enthalpy-increasing pipeline is first controlled to be opened, and at this time, the electronic expansion valve in the enthalpy-increasing pipeline is still in a minimum opening state. Under the negative pressure of the compressor, the pressure in the enthalpy-increasing pipeline is reduced, the liquid refrigerant is gradually converted into gaseous refrigerant and enters the compressor. After the first preset time length, the liquid refrigerant in the enthalpy-increasing pipeline enters the compressor in the form of gaseous refrigerant, at this time, the electronic expansion valve is opened, liquid refrigerant cannot enter the compressor along the enthalpy-increasing pipeline, the phenomenon of liquid hammering of the compressor is avoided, the overcurrent output of the frequency conversion module of the air conditioner is avoided, and the safety of the air conditioner is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to an air conditioner control method, control device, and air conditioner. Background Technology

[0002] To improve refrigerant compression efficiency and reduce exhaust temperature, the compressor incorporates an enthalpy-increasing port in addition to the suction and discharge ports. When the system reaches a stable state, opening the enthalpy-increasing solenoid valve increases the refrigerant compression, thereby improving overall output efficiency. However, this enthalpy-increasing technology also has some drawbacks. At the moment the enthalpy-increasing solenoid valve opens, the amount of refrigerant the compressor needs to process suddenly increases. If the refrigerant in the enthalpy-increasing line is liquid at this time, it may cause liquid compression in the compressor, resulting in a sharp increase in load. Secondly, liquid compression may cause overcurrent in the inverter module, threatening the stability of the entire system. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention proposes a control method for an air conditioner. When the air conditioner is operating in enthalpy-increasing mode, the solenoid valve and electronic expansion valve of the enthalpy-increasing pipeline are opened sequentially with an opening interval of a first preset time. This allows the liquid refrigerant in the enthalpy-increasing pipeline to turn into a gaseous state under low pressure and enter the compressor's gas inlet, preventing liquid refrigerant from entering the compressor, avoiding liquid slugging and inverter overcurrent phenomena, and improving the safety of the air conditioner.

[0004] The present invention also provides a control device for an air conditioner.

[0005] The present invention also provides an air conditioner.

[0006] A control method for an air conditioner according to a first aspect embodiment of the present invention includes:

[0007] Upon receiving an instruction to operate in enthalpy-increasing mode, and when the compressor meets the preset conditions for entering the enthalpy-increasing mode, the solenoid valve of the enthalpy-increasing pipeline is opened, and the electronic expansion valve is opened after a first preset time.

[0008] According to an embodiment of the present invention, the step of controlling the opening of the electronic expansion valve specifically includes:

[0009] The operating frequency of the compressor is obtained, and the target opening degree of the electronic expansion valve is determined based on the operating frequency and a predetermined enthalpy relationship.

[0010] The opening degree of the electronic expansion valve is adjusted to the target opening degree at a preset rate.

[0011] According to an embodiment of the present invention, the preset conditions for entering the enthalpy-increasing mode are determined through the following steps:

[0012] Obtain the compressor's operating frequency and record the corresponding time.

[0013] The duration during which the operating frequency is greater than or equal to the frequency threshold is determined based on the operating frequency, the pre-acquired frequency threshold, and the corresponding time.

[0014] The preset conditions for entering the enthalpy-increasing mode include: the duration is greater than or equal to the second preset duration.

[0015] According to an embodiment of the present invention, the first preset duration is obtained through the following steps:

[0016] Obtain the compressor's downtime;

[0017] The first preset duration is determined based on the downtime and the preset refrigerant accumulation relationship; wherein the downtime is positively correlated with the first preset duration.

[0018] According to an embodiment of the present invention, the first preset duration is obtained through the following steps:

[0019] Obtain the last valve closure information of the enthalpy-increasing pipeline, and determine the valve closure status of the enthalpy-increasing pipeline based on the last valve closure information; wherein, the valve closure status includes emergency valve closure status and normal closure status;

[0020] When the valve is in the normal closed state, the first preset duration is determined according to a predetermined delay relationship;

[0021] When the valve is in the emergency shut-off state, the first preset duration is determined according to a predetermined multiplier; wherein the predetermined multiplier is greater than 1.

[0022] According to one embodiment of the present invention, after the step of controlling the electronic expansion valve to open after a first preset time, the method further includes:

[0023] Upon receiving an instruction to exit the enthalpy-increasing mode, the electronic expansion valve is controlled to close, and the solenoid valve is controlled to close after a third preset time period.

[0024] According to an embodiment of the present invention, the preset rate is obtained through the following steps:

[0025] Obtain the compressor's downtime;

[0026] The preset rate is determined based on the downtime and the preset refrigerant accumulation relationship; wherein the downtime is negatively correlated with the preset rate.

[0027] According to one embodiment of the present invention, the step of opening the solenoid valve of the enthalpy-increasing pipeline further includes, prior to:

[0028] Obtain the current opening degree and the predetermined minimum opening degree of the electronic expansion valve;

[0029] When the current opening degree is greater than the minimum opening degree, the opening degree of the electronic expansion valve is adjusted to the minimum opening degree.

[0030] According to a second aspect embodiment of the present invention, a control device for an air conditioner includes:

[0031] The determination mode is used to determine whether the compressor meets the preset conditions for entering the enthalpy-increasing mode when a command to run the enthalpy-increasing mode is received.

[0032] The control module is used to control the opening of the solenoid valve in the enthalpy-increasing pipeline and, after a first preset time, to control the opening of the electronic expansion valve.

[0033] An air conditioner according to a third aspect of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of the control method for the air conditioner according to a first aspect of the present invention.

[0034] The above-described one or more technical solutions of this invention have at least one of the following technical effects:

[0035] According to an embodiment of the present invention, the control method for an air conditioner includes: upon receiving an instruction to operate in enthalpy-increasing mode and when the compressor meets preset conditions for entering the enthalpy-increasing mode, controlling the solenoid valve of the enthalpy-increasing pipeline to open, and controlling the electronic expansion valve to open after a first preset time period. When the air conditioner automatically generates an instruction to operate in enthalpy-increasing mode under user operation or when the preset conditions for entering the enthalpy-increasing mode are met, the solenoid valve of the enthalpy-increasing pipeline is first opened, while the electronic expansion valve in the enthalpy-increasing pipeline remains at its minimum opening. Under the negative pressure of the compressor, the pressure in the enthalpy-increasing pipeline decreases, and the liquid refrigerant gradually converts into a gaseous state and enters the compressor's gas inlet. After the first preset time period, the liquid refrigerant in the enthalpy-increasing pipeline enters the compressor in gaseous form. At this time, opening the electronic expansion valve prevents liquid refrigerant from entering the compressor along the enthalpy-increasing pipeline, avoiding liquid slugging in the compressor and preventing overcurrent in the air conditioner's inverter module output, thus improving the safety and stability of the air conditioner. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart of an air conditioner control method provided in an embodiment of the present invention;

[0038] Figure 2 A schematic structural diagram of the control device for an air conditioner provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic structural diagram of the electronic device of an air conditioner provided in an embodiment of the present invention.

[0040] Figure label:

[0041] 301. Determine module; 302. Control module. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the invention clearer, the technical solutions of the invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0045] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] In related technologies, the amount of refrigerant that the compressor needs to handle suddenly increases the instant the enthalpy-increasing solenoid valve is opened. If the refrigerant in the enthalpy-increasing line is liquid at this time, it may cause liquid compression of the compressor, resulting in a sharp increase in load. Secondly, liquid compression may cause overcurrent in the inverter module output, threatening the stability of the entire system.

[0048] The air conditioner involved in this invention includes an enthalpy-increasing pipeline, which connects the liquid line of the air conditioner and the compressor's gas inlet. The enthalpy-increasing pipeline can subcool the refrigerant in the liquid line before throttling, increasing the enthalpy difference. It can also appropriately preheat the low-pressure, low-temperature refrigerant in the enthalpy-increasing circuit after pressure reduction by the electronic expansion valve to achieve a suitable medium pressure, which is then supplied to the compressor's gas inlet for secondary compression. The specifications and structure of the enthalpy-increasing pipeline are not limited and can be selected as needed. The enthalpy-increasing pipeline is equipped with a solenoid valve and an electronic expansion valve. Controlling the opening and closing of the solenoid valve controls whether the refrigerant in the enthalpy-increasing pipeline can flow to the compressor's gas inlet, and adjusting the opening of the electronic expansion valve regulates the refrigerant flow rate and refrigerant state in the enthalpy-increasing pipeline.

[0049] When the enthalpy-increasing line is closed, both the solenoid valve and the electronic expansion valve are closed. The electronic expansion valve regulates the refrigerant flow in the enthalpy-increasing line, and its opening can be precisely controlled to adapt to different operating conditions. Normally, the electronic expansion valve is not completely closed, as this could lead to pressure imbalances within the system, adversely affecting the compressor and the entire system. When the opening of the electronic expansion valve decreases to a certain extent, it restricts refrigerant flow, but does not completely block it. Even at its minimum opening, a small amount of refrigerant can still pass through the valve to maintain normal system operation and balance. This is because the refrigerant needs to circulate within the system for effective heat transfer and cooling.

[0050] Please refer to the control method for an air conditioner provided in the first aspect embodiment of the present invention. Figure 1 ,include:

[0051] S100: Upon receiving an instruction to operate in enthalpy-increasing mode and when the compressor meets the preset conditions for entering enthalpy-increasing mode, the solenoid valve of the enthalpy-increasing pipeline is opened, and the electronic expansion valve is opened after a first preset time.

[0052] Understandably, compressors can automatically or manually enter enthalpy-enhancing mode in low-temperature environments or under conditions of large temperature differences; when the outdoor temperature drops to a certain level, cooling or heating efficiency will decrease. Vapor injection enthalpy enhancement technology is suitable for low-temperature environments, improving system efficiency by increasing refrigerant flow; it works best when the evaporation and condensation temperatures differ significantly. It helps improve heat exchange efficiency, especially under conditions of large temperature differences.

[0053] When the air conditioner operates automatically or generates a command to run in enthalpy-increasing mode, if the preset conditions for entering enthalpy-increasing mode are met, the solenoid valve in the enthalpy-increasing pipeline is first opened. At this time, the electronic expansion valve in the enthalpy-increasing pipeline is still at its minimum opening or closed (as mentioned above, the electronic expansion valve is not completely closed). Under the negative pressure of the compressor, the refrigerant pressure in the enthalpy-increasing pipeline decreases, and the liquid refrigerant is converted into a gaseous state and slowly enters the compressor. After the first preset time, all the liquid refrigerant in the enthalpy-increasing pipeline enters the compressor in gaseous form. At this time, the electronic expansion valve is opened, and no liquid refrigerant will enter the compressor along the enthalpy-increasing pipeline, avoiding liquid slugging in the compressor and preventing overcurrent in the air conditioner's inverter module output, thus improving the safety and stability of the air conditioner. The first preset duration can be determined based on experiments. For example, liquid refrigerant is placed in the enthalpy-increasing pipeline, and the electronic expansion valve is kept in the minimum opening / closed state. At this time, the suction pressure of the compressor is applied to the outlet end of the enthalpy-increasing pipeline. The first preset duration can be determined based on the time it takes for the liquid refrigerant to be completely converted into gaseous refrigerant. The first preset duration is related to the amount of liquid refrigerant.

[0054] In some embodiments, the step of controlling the opening of the electronic expansion valve specifically includes:

[0055] S101. Obtain the operating frequency of the compressor, and determine the target opening degree of the electronic expansion valve based on the operating frequency and the predetermined enthalpy relationship.

[0056] Understandably, firstly, it's necessary to monitor and measure the actual operating frequency of the compressor, typically done automatically by the control system (such as a frequency converter), which provides real-time data. The compressor's operating frequency determines its workload and the speed of refrigerant circulation. Secondly, the control system analyzes this data and refers to a preset enthalpy-increasing curve or model. This curve or model, based on previous experimental, simulation, or actual operating data, represents the electronic expansion valve opening that should be set at a specific compressor frequency to achieve optimal energy efficiency and system stability. Based on this analysis, the controller calculates a target opening value, i.e., the desired degree of electronic expansion valve opening. This opening adjustment controls the speed at which refrigerant flows through the electronic expansion valve, thereby affecting the refrigerant flow rate and state in the enthalpy-increasing pipeline. At this target opening value, the refrigerant supply in the enthalpy-increasing pipeline can be matched with the compressor's operating frequency to achieve the best enthalpy-increasing effect.

[0057] S102. Adjust the opening degree of the electronic expansion valve to the target opening degree according to the preset rate.

[0058] Understandably, step S102 defines the process of gradually adjusting the electronic expansion valve from its current opening to the target opening. The preset rate determines the speed at which the electronic expansion valve changes its opening. This rate can be constant, such as 4 pls / second, or it can change dynamically according to specific conditions. The choice of rate depends on the characteristics and requirements of the system, such as avoiding excessively rapid temperature changes, reducing mechanical stress, or optimizing energy efficiency. The target opening is the opening value that the control system expects the electronic expansion valve to ultimately reach. It is usually determined by the system's needs or operating conditions. For example, the target opening may be increased when the refrigerant quantity needs to be increased, and vice versa. The actual opening of the electronic expansion valve will gradually approach and reach the target opening according to the preset rate. This process may be linear or non-linear, depending on the controller design and the requirements of the actual application. In this way, the control system can ensure that the electronic expansion valve adjusts its opening in a stable and controllable manner, thereby enabling the entire air conditioning or refrigeration system to work more effectively and maintain good performance and stability under various operating conditions.

[0059] In some embodiments, the preset conditions for entering the enthalpy-increasing mode are determined by the following steps:

[0060] S103. Obtain the compressor's operating frequency and record the corresponding time.

[0061] Understandably, monitoring and measuring the actual operating frequency of the compressor is usually done automatically by the control system (such as a frequency converter), which provides real-time data. The compressor's operating frequency determines its workload and the speed of refrigerant circulation. By monitoring the compressor's operating frequency and recording the corresponding times, the compressor's operating status can be determined based on the operating frequency and timetable.

[0062] S104. Based on the operating frequency, the pre-acquired frequency threshold, and the corresponding time, determine the duration for which the operating frequency is greater than or equal to the frequency threshold; then the preset conditions for entering the enthalpy-increasing mode include: the duration is greater than or equal to the second preset duration.

[0063] Step S104 defines the duration for which the compressor will continuously operate above a specific frequency, based on the compressor's operating frequency, a pre-set frequency threshold, and time information. The operating frequency refers to the actual frequency at which the compressor operates, reflecting its actual working state and performance. The frequency threshold can be set according to the compressor's design characteristics, expected performance, or safety requirements. The compressor's operating frequency is monitored in real-time and compared with the pre-set frequency threshold. When the compressor's operating frequency is higher than or equal to the frequency threshold, the duration for which the compressor will continuously operate at this high frequency is calculated. This method allows monitoring of whether the compressor is in a high-frequency stable state, enabling a determination of whether it can enter enthalpy-increasing mode to ensure compressor stability and lifespan, while also helping to improve the energy efficiency and reliability of the enthalpy-increasing mode.

[0064] In some embodiments, the first preset duration is obtained through the following steps:

[0065] S1051. Obtain the compressor's downtime.

[0066] S1052. Determine the first preset duration based on the downtime and the preset refrigerant accumulation relationship; wherein the downtime is positively correlated with the first preset duration.

[0067] Steps S1051 and S1052 describe determining the first preset duration based on the equipment's downtime and a preset refrigerant accumulation relationship. Downtime refers to the period between when the equipment stops operating and when it restarts, such as the downtime between the last time the air conditioner was turned off and the current time it is turned on. It can also be due to maintenance, fault repair, or other reasons. The preset refrigerant accumulation relationship reflects the degree to which refrigerant may accumulate inside the enthalpy-increasing pipe under a specific downtime. The longer the air conditioner's downtime, the greater the likelihood and amount of refrigerant accumulation in the enthalpy-increasing pipe, requiring more time for effective processing and adjustment. Therefore, the first preset duration should be increased accordingly.

[0068] In some embodiments, the first preset duration is obtained through the following steps:

[0069] S106. Obtain the previous valve closing information of the enthalpy-increasing pipeline, and determine the valve closing status of the enthalpy-increasing pipeline based on the previous valve closing information; wherein, the valve closing status includes emergency valve closing status and normal closing status.

[0070] It is understandable that during operation, the air conditioner can control the opening, closing, and opening degree of the electronic expansion valve in the enthalpy-increasing pipeline based on normal control logic. The state of the electronic expansion valve is determined based on the control commands sent by the controller. Therefore, based on the control information sent to the electronic expansion valve, the energization state, current opening degree, opening time, closing time, opening rate, and closing rate of the electronic expansion valve can be determined. In this embodiment of the invention, the last valve-closing information can be determined based on the last valve-closing step performed by the electronic expansion valve. For example, if the opening degree of the electronic expansion valve is at its minimum when the power is off, it proves that the valve is in a normal closed state; if the opening degree of the electronic expansion valve is greater than the minimum opening when the power is off, it indicates that the electronic expansion valve is in an emergency valve-closing state, at which time there is residual refrigerant in the enthalpy-increasing pipeline.

[0071] S1071. When the valve is in a normal closed state, a first preset duration is determined according to a predetermined delay relationship.

[0072] It is understandable that when the electronic expansion valve is closed normally, the first preset duration is determined according to the preset delay relationship, such as the first preset duration being 20 to 30 seconds.

[0073] S1072. When the valve is in an emergency closing state, a first preset duration is determined according to a predetermined multiplier; wherein the predetermined multiplier is greater than 1.

[0074] Understandably, if the valve is in an emergency shut-off state, there is a high probability that residual refrigerant remains in the enthalpy-increasing pipeline. Therefore, the first preset duration needs to be extended to allow the liquid refrigerant in the pipeline to fully convert to a gaseous state. The system stores a basic first preset duration based on a preset delay relationship. The extended first preset duration is then determined based on the predetermined multiplier and the basic first preset duration.

[0075] In some embodiments, after the step of controlling the electronic expansion valve to open after a first preset time period, the method further includes:

[0076] S110. Upon receiving an instruction to exit the enthalpy-increasing mode, control the electronic expansion valve to close, and control the solenoid valve to close after a third preset time.

[0077] It can be understood that upon receiving the command to exit enthalpy-increasing mode, the electronic expansion valve is first closed, while the solenoid valve remains open. The electronic expansion valve is adjusted to its minimum opening at a certain rate. During this process, the refrigerant in the enthalpy-increasing pipeline maintains a small flow rate, entering the compressor's gas inlet in gaseous form. This prevents a sudden decrease in the compressor's intake volume from causing significant current deviations. Simultaneously, it prevents the refrigerant in the enthalpy-increasing pipeline from liquefying, thus avoiding impacts on the module output caused by sudden changes in compressor load.

[0078] In some embodiments, the preset rate is obtained through the following steps:

[0079] S1021. Obtain the compressor's downtime.

[0080] S1022. Determine the preset rate based on the downtime and the preset refrigerant accumulation relationship; wherein, the downtime is negatively correlated with the preset rate.

[0081] Steps S1021 and S1022 describe determining a preset rate based on the compressor's shutdown duration and a preset refrigerant accumulation relationship, used to control and optimize system operation. The shutdown duration refers to the time between the equipment stopping operation and restarting, such as the shutdown time between the last time the air conditioner was turned off and the current time it is turned on, and can also be due to maintenance, fault repair, or other reasons. The preset refrigerant accumulation relationship reflects the degree to which refrigerant may accumulate inside the enthalpy-increasing pipeline under a specific shutdown duration. The longer the air conditioner's shutdown duration, the greater the possibility of refrigerant accumulation in the enthalpy-increasing pipeline, and the greater the accumulation, requiring more time for effective processing and adjustment. Therefore, the preset rate for adjusting the electronic expansion valve opening is slower. Reducing the preset rate slows down the refrigerant flow rate, giving the system more time to adapt to changes and providing a longer time for the liquid refrigerant in the enthalpy-increasing pipeline to convert to a gaseous state.

[0082] In some embodiments, the step of controlling the opening of the solenoid valve in the enthalpy-increasing pipeline further includes, prior to:

[0083] S108. Obtain the current opening degree of the electronic expansion valve and the predetermined minimum opening degree.

[0084] S109. When the current opening degree is greater than the minimum opening degree, adjust the opening degree of the electronic expansion valve to the minimum opening degree.

[0085] In this embodiment, the adjustment of the electronic expansion valve's opening is defined based on its current opening and a preset minimum opening. The current opening of the electronic expansion valve refers to its actual degree of opening at the current moment, determining the speed and flow rate of refrigerant through the valve. The preset minimum opening represents the minimum allowable opening degree of the electronic expansion valve under specific conditions. If the actual opening of the electronic expansion valve exceeds the preset minimum opening, adjustment is required. The control system instructs the electronic expansion valve to reduce its opening to the preset minimum opening. This is done to prevent the electronic expansion valve from opening too wide when the solenoid valve is open, thus preventing liquid refrigerant from entering the compressor's gas inlet and ensuring that the refrigerant is converted to gaseous refrigerant only at a relatively low flow rate and pressure when the solenoid valve is open, thereby ensuring the compressor's safety.

[0086] For the control device of the air conditioner provided according to the second aspect embodiment of the present invention, please refer to Figure 2 ,include:

[0087] The determination module 301 is used to determine whether the compressor meets the preset conditions for entering the enthalpy-increasing mode when it receives an instruction to run the enthalpy-increasing mode.

[0088] The control module 302 is used to control the opening of the solenoid valve in the enthalpy-increasing pipeline and to control the opening of the electronic expansion valve after a first preset time.

[0089] It should be noted that the above steps S100 and other steps are for ease of description only and do not constitute a time sequence limitation for the steps in the air conditioner control method. Furthermore, some content is described in detail in the air conditioner control method provided in the first aspect embodiment, and all content in the air conditioner control method is also applicable to the air conditioner control device provided in the second aspect embodiment. Therefore, to avoid repetition, the air conditioner control device provided in the second aspect embodiment is not described in detail. Similarly, the content in the above two aspect embodiments can be used to explain the content of all subsequent aspect embodiments; therefore, repeated content will not be described in subsequent embodiments. The technical effects of the air conditioner control device provided according to the embodiments of the present invention correspond to the technical effects of the above-described air conditioner control method, and will not be repeated here.

[0090] An air conditioner according to a third aspect of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of the control method for the air conditioner according to a first aspect of the present invention.

[0091] Figure 3A schematic diagram illustrating the physical structure of an electronic device for an air conditioner is provided. This electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840. The processor 810, communication interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logical instructions stored in the memory 830 to execute a control method for the air conditioner. This method includes: upon receiving an instruction to operate in enthalpy-increasing mode and when the compressor meets preset conditions for entering enthalpy-increasing mode, controlling the solenoid valve of the enthalpy-increasing pipeline to open, and controlling the electronic expansion valve to open after a first preset time period.

[0092] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0093] The device embodiments described above are merely illustrative. 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0094] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes an enthalpy-increasing pipeline, which connects the liquid pipe of the air conditioner and the gas inlet of the compressor. A solenoid valve and an electronic expansion valve are installed on the enthalpy-increasing pipeline. Upon receiving an instruction to operate in enthalpy-increasing mode, and when the compressor meets the preset conditions for entering the enthalpy-increasing mode, the solenoid valve of the enthalpy-increasing pipeline is opened, and the electronic expansion valve is opened after a first preset time. The first preset duration is obtained through the following steps: Obtain the compressor's downtime; The first preset duration is determined based on the downtime and a preset refrigerant accumulation relationship; wherein the downtime is positively correlated with the first preset duration. Alternatively, the first preset duration can be obtained through the following steps: Obtain the last valve closure information of the enthalpy-increasing pipeline, and determine the valve closure status of the enthalpy-increasing pipeline based on the last valve closure information; wherein, the valve closure status includes emergency closure status and normal closure status; When the valve is in the normal closed state, the first preset duration is determined according to a predetermined delay relationship; When the valve is in the emergency closing state, the first preset duration is determined according to a predetermined multiplier; wherein the predetermined multiplier is greater than 1. If the valve is in an emergency shutdown state, an additional first preset duration is required. The system stores a basic first preset duration based on a preset delay relationship. At this time, the extended first preset duration is determined based on the predetermined multiplier and the basic first preset duration.

2. The control method for an air conditioner according to claim 1, characterized in that, The step of controlling the opening of the electronic expansion valve specifically includes: The operating frequency of the compressor is obtained, and the target opening degree of the electronic expansion valve is determined based on the operating frequency and a predetermined enthalpy relationship. The opening degree of the electronic expansion valve is adjusted to the target opening degree at a preset rate.

3. The control method for an air conditioner according to claim 2, characterized in that, The preset conditions for entering the enthalpy-increasing mode are determined through the following steps: Obtain the compressor's operating frequency and record the corresponding time. The duration during which the operating frequency is greater than or equal to the frequency threshold is determined based on the operating frequency, the pre-acquired frequency threshold, and the corresponding time. The preset conditions for entering the enthalpy-increasing mode include: the duration is greater than or equal to the second preset duration.

4. The control method for an air conditioner according to any one of claims 1 to 3, characterized in that, The step of controlling the electronic expansion valve to open after a first preset time period is followed by: Upon receiving an instruction to exit the enthalpy-increasing mode, the electronic expansion valve is controlled to close, and the solenoid valve is controlled to close after a third preset time period.

5. The control method for an air conditioner according to claim 2, characterized in that, The preset rate is obtained through the following steps: Obtain the compressor's downtime; The preset rate is determined based on the downtime and the preset refrigerant accumulation relationship; wherein the downtime is negatively correlated with the preset rate.

6. The control method for an air conditioner according to any one of claims 1 to 3, characterized in that, The step of opening the solenoid valve in the enthalpy-increasing pipeline is preceded by: Obtain the current opening degree and the predetermined minimum opening degree of the electronic expansion valve; When the current opening degree is greater than the minimum opening degree, the opening degree of the electronic expansion valve is adjusted to the minimum opening degree.

7. A control device for an air conditioner, characterized in that, The air conditioner includes an enthalpy-increasing pipeline, which connects the liquid pipe of the air conditioner and the gas inlet of the compressor. A solenoid valve and an electronic expansion valve are installed on the enthalpy-increasing pipeline. The control device includes: The determination module is used to determine whether the compressor meets the preset conditions for entering the enthalpy-increasing mode when it receives an instruction to run the enthalpy-increasing mode. The control module is used to control the opening of the solenoid valve in the enthalpy-increasing pipeline and to control the opening of the electronic expansion valve after a first preset time. The first preset duration is obtained through the following steps: Obtain the compressor's downtime; The first preset duration is determined based on the downtime and a preset refrigerant accumulation relationship; wherein the downtime is positively correlated with the first preset duration. Alternatively, the first preset duration can be obtained through the following steps: Obtain the last valve closure information of the enthalpy-increasing pipeline, and determine the valve closure status of the enthalpy-increasing pipeline based on the last valve closure information; wherein, the valve closure status includes emergency closure status and normal closure status; When the valve is in the normal closed state, the first preset duration is determined according to a predetermined delay relationship; When the valve is in the emergency closing state, the first preset duration is determined according to a predetermined multiplier; wherein the predetermined multiplier is greater than 1. If the valve is in an emergency shutdown state, an additional first preset duration is required. The system stores a basic first preset duration based on a preset delay relationship. At this time, the extended first preset duration is determined based on the predetermined multiplier and the basic first preset duration.

8. An air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the control method for the air conditioner as described in any one of claims 1 to 6.

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