Air conditioning system control methods, electronic equipment, air conditioning systems and products

Abstract

This application discloses a control method, electronic device, air conditioning system, and computer program product for an air conditioning system. The method includes: acquiring target operating parameters of the air conditioning system; determining target parameters related to pipe length based on the target operating parameters; and determining a target control cycle for an electronic expansion valve based on the target parameters, so as to control the electronic expansion valve according to the target control cycle. Thus, this application allows the control cycle of the electronic expansion valve to be determined based on the pipe length connecting the indoor and outdoor units in the system, achieving a match between the target control cycle of the electronic expansion valve and the pipe length, thereby ensuring that the target control cycle of the electronic expansion valve aligns with the actual installation conditions of the pipes within the air conditioning system. Furthermore, compared to controlling the electronic expansion valve with a fixed control cycle, this method can, to some extent, improve situations such as over-adjustment, lag, or slow response under different pipe lengths.

Description

Technical Field

[0001] This application relates to the field of air conditioning control technology, and in particular to a control method for an air conditioning system, electronic equipment, an air conditioning system, and a computer program product. Background Technology

[0002] In related technologies, to avoid frequent operation of the electronic expansion valve causing oscillations in multi-split air conditioning systems (such as oscillations in suction superheat and fluctuations in suction pressure), and to prevent the electronic expansion valve from failing to respond promptly to changes in indoor and outdoor operating conditions (such as indoor unit start-up and shutdown, and sudden load changes) due to prolonged inactivity, air conditioning manufacturers typically set the control cycle of the electronic expansion valve in multi-split air conditioning systems to a conservative, compromised value. However, when the control cycle of the electronic expansion valve is set to a conservative, compromised value, it cannot meet the system requirements under different installation scenarios, and the system's energy efficiency will be affected. Summary of the Invention

[0003] This application provides a control method for an air conditioning system, an electronic device, an air conditioning system, and a computer program product.

[0004] This application provides a control method for an air conditioning system, the air conditioning system including an outdoor unit and at least one indoor unit, the outdoor unit and the at least one indoor unit being connected via pipes, the outdoor unit including a compressor, and each indoor unit including a heat exchanger and an electronic expansion valve connected to the heat exchanger, the method comprising: Obtain the target operating parameters of the air conditioning system, wherein the target operating parameters include the current inlet plate temperature, the current outlet plate temperature of each target heat exchanger currently in operation, and the current suction pressure of the compressor; Based on the target operating parameters, determine the target parameters related to the pipeline length; Based on the target parameters, a target control cycle for the electronic expansion valve is determined, so that the electronic expansion valve is controlled according to the target control cycle.

[0005] Thus, in this embodiment, the target operating parameters of the air conditioning system can be obtained, and based on these parameters, target parameters related to the pipe length can be determined. Furthermore, based on these target parameters, the target control cycle of the electronic expansion valve can be determined, allowing the electronic expansion valve to be controlled according to the target control cycle. This enables the electronic expansion valve control cycle to be determined based on the pipe length connecting the indoor and outdoor units in the system, achieving a match between the target control cycle of the electronic expansion valve and the pipe length. This ensures that the target control cycle of the electronic expansion valve aligns with the actual installation conditions of the pipes within the air conditioning system. Moreover, compared to controlling the electronic expansion valve with a fixed control cycle, this method can improve, to some extent, issues such as over-adjustment, lag, or slow response under different pipe lengths. In addition, since the target parameters are determined using the current inlet and outlet temperatures of each heat exchanger currently in operation, as well as the current suction pressure of the compressor, the correlation between the target parameters and the pipe length can be guaranteed to a certain extent. Therefore, the effectiveness and reliability of the target control cycle determined by the target parameters can be ensured.

[0006] In some embodiments, the electronic expansion valve is used to control the flow state of the refrigerant in the pipeline, and determining the target parameters related to the pipeline length based on the target operating parameters includes: The target evaporation temperature of the refrigerant is determined based on the current inlet temperature and the current outlet temperature of each target heat exchanger. Based on the current inhalation pressure, determine the first saturation temperature corresponding to the current inhalation pressure; The first difference between the target evaporation temperature and the first saturation temperature is determined as the target parameter.

[0007] Thus, in this embodiment, the target evaporation temperature of the refrigerant can be determined based on the current inlet and outlet temperatures of each target heat exchanger, and the first saturation temperature corresponding to the current suction pressure can be determined based on the current suction pressure. The difference between the target evaporation temperature and the first saturation temperature is then determined as the target parameter, thereby realizing the conversion of the target operating parameters into target parameters that can characterize the pipeline length.

[0008] In some embodiments, determining the target evaporation temperature of the refrigerant based on the current inlet plate temperature and the current outlet plate temperature of each of the target heat exchangers includes: The average value of the current inlet plate temperature and the current outlet plate temperature of the target heat exchanger is determined as the current middle plate temperature of the target heat exchanger; The average value of the current center plate temperature of each of the target heat exchangers is determined as the target evaporation temperature.

[0009] Thus, in this embodiment, the average of the current inlet plate temperature and the current outlet plate temperature of the target heat exchanger can be determined as the current middle plate temperature of the target heat exchanger, and the average of the current middle plate temperature of each target heat exchanger can be determined as the target evaporation temperature, thereby achieving robust determination of the target evaporation temperature.

[0010] In some embodiments, determining the target control period of the electronic expansion valve based on the target parameter, and controlling the electronic expansion valve according to the target control period, includes: If the target parameter is greater than or equal to the first preset temperature value, the first preset period is determined as the target control period; When the target parameter is greater than the second preset temperature value and less than the first preset temperature value, the second preset period is determined as the target control period, wherein the first preset period is greater than the second preset period; When the target parameter is greater than the third preset temperature value and less than or equal to the second preset temperature value, the third preset period is determined as the target control period, wherein the second preset period is greater than the third preset period; If the target parameter is less than or equal to the third preset temperature value, the fourth preset period is determined as the target control period, wherein the third preset period is greater than the fourth preset period.

[0011] Thus, in this embodiment, when the target parameter is greater than or equal to the first preset temperature value, the first preset period can be determined as the target control period; when the target parameter is greater than the second preset temperature value and less than the first preset temperature value, the second preset period can be determined as the target control period; when the target parameter is greater than the third preset temperature value and less than or equal to the second preset temperature value, the third preset period can be determined as the target control period; and when the target parameter is less than or equal to the third preset temperature value, the fourth preset period can be determined as the target control period, thereby completing the determination of the target control period.

[0012] In some embodiments, the method further includes: When the electronic expansion valve is controlled according to the target control cycle, the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle are obtained; Based on the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle, the target control cycle is corrected to obtain a corrected control cycle, and the electronic expansion valve is controlled according to the corrected control cycle.

[0013] Thus, in this embodiment, when the electronic expansion valve is controlled according to the target control cycle, the discharge pressure and discharge temperature of the compressor under the target control cycle can be obtained, and the target control cycle can be corrected according to the discharge pressure and discharge temperature of the compressor under the target control cycle to obtain a corrected control cycle. The electronic expansion valve can then be controlled according to the corrected control cycle. This allows the control cycle of the electronic expansion valve to be corrected by the discharge pressure and discharge temperature of the outdoor unit compressor, thereby enabling the control cycle of the electronic expansion valve to match the real-time operating status of the air conditioning system. This allows the control cycle of the electronic expansion valve to match both the static attribute of the pipeline length and the real-time operating status of the air conditioning system.

[0014] In some embodiments, the step of correcting the target control cycle based on the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle to obtain a corrected control cycle, and controlling the electronic expansion valve according to the corrected control cycle, includes: Based on the exhaust pressure of the air conditioning system under the target control cycle, determine the second saturation temperature of the air conditioning system under the target control cycle; The difference between the exhaust temperature and the second saturation temperature of the air conditioning system under the target control cycle is determined as the exhaust superheat of the air conditioning system under the target control cycle. Based on the exhaust superheat of the air conditioning system under the target control cycle, the target control cycle is corrected to obtain the corrected control cycle, and the electronic expansion valve is controlled according to the corrected control cycle.

[0015] Thus, in this embodiment, the second saturation temperature of the air conditioning system under the target control cycle can be determined based on the exhaust pressure of the air conditioning system under the target control cycle. The difference between the exhaust temperature and the second saturation temperature under the target control cycle is determined as the exhaust superheat of the air conditioning system under the target control cycle. Based on the exhaust superheat of the air conditioning system under the target control cycle, the target control cycle is corrected to obtain a corrected control cycle. The electronic expansion valve is then controlled according to the corrected control cycle. This allows the exhaust temperature and exhaust pressure to be converted into exhaust superheat, thereby characterizing the real-time operating status of the air conditioning system. It also accurately reflects the phase state of the refrigerant at the compressor exhaust end, the heat exchange efficiency of the system, and the refrigerant cycle stability. The corrected control cycle is then used to ensure that it reliably matches the actual operating requirements of the system, guaranteeing the correction effect and the control accuracy of the electronic expansion valve.

[0016] In some embodiments, the step of correcting the target control cycle based on the exhaust superheat of the air conditioning system under the target control cycle to obtain the corrected control cycle, and controlling the electronic expansion valve according to the corrected control cycle, includes: Based on the exhaust superheat of the air conditioning system in multiple consecutive target control cycles, determine the maximum and minimum exhaust superheat in multiple consecutive target control cycles; The period correction coefficient is determined based on the second difference between the maximum exhaust superheat and the minimum exhaust superheat. The target control cycle is corrected according to the cycle correction coefficient to obtain the corrected control cycle, and the electronic expansion valve is controlled according to the corrected control cycle.

[0017] Thus, in this embodiment, the maximum and minimum exhaust superheat of the air conditioning system within multiple consecutive target control cycles can be determined based on the exhaust superheat of the air conditioning system. A cycle correction coefficient is then determined based on the second difference between the maximum and minimum exhaust superheat. The target control cycle is then corrected based on the cycle correction coefficient to obtain a corrected control cycle. The electronic expansion valve is controlled according to this corrected control cycle. This allows for the calculation of the second difference by statistically analyzing the extreme values ​​of exhaust superheat over multiple consecutive cycles, thereby determining the fluctuation range of exhaust superheat over multiple consecutive cycles. This is used as a basis to correct the control cycle of the electronic expansion valve, making the correction basis for the control cycle more objective and comprehensive, and ensuring the reliability and effectiveness of the correction process.

[0018] In some embodiments, determining the period correction coefficient based on a second difference between the maximum exhaust superheat and the minimum exhaust superheat includes: If the second difference is greater than or equal to the first preset exhaust superheat threshold, the first preset coefficient is determined as the period correction coefficient. When the second difference is greater than the second preset exhaust superheat threshold and less than the first preset exhaust superheat threshold, the second preset coefficient is determined as the periodic correction coefficient, wherein the first preset coefficient is greater than the second preset coefficient. If the second difference is less than or equal to the second preset exhaust superheat threshold, the third preset coefficient is determined as the period correction coefficient, wherein the second preset coefficient is greater than the third preset coefficient.

[0019] Thus, in this embodiment of the application, when the second difference is greater than or equal to the first preset exhaust superheat threshold, the first preset coefficient can be determined as the periodic correction coefficient; when the second difference is greater than the second preset exhaust superheat threshold and less than the first preset exhaust superheat threshold, the second preset coefficient can be determined as the periodic correction coefficient; and when the second difference is less than or equal to the second preset exhaust superheat threshold, the third preset coefficient can be determined as the periodic correction coefficient, thereby achieving efficient determination of the periodic correction coefficient.

[0020] In some embodiments, the step of correcting the target control period according to the period correction coefficient to obtain the corrected control period, and controlling the electronic expansion valve according to the corrected control period, includes: The product of the period correction coefficient and the target control period is determined as the correction control period, so as to control the electronic expansion valve according to the correction control period.

[0021] Thus, in the embodiments of this application, the product of the period correction coefficient and the target control period can be determined as the correction control period, so as to control the electronic expansion valve according to the correction control period, thereby achieving efficient determination of the correction control period.

[0022] This application provides a control device for an air conditioning system, the device comprising: The first acquisition module is used to acquire the target message information of the message to be processed when the target vector data packet processing node receives the message to be processed, wherein the target message information includes a first physical address, a first message input interface and a first message output interface; The processing module is used to process the message to be processed according to the target message information and the message processing rules corresponding to the target vector data packet processing node. The message processing rules are used to determine the target processing method corresponding to the target message information. The target processing method is at least one of local response processing, sending processing and dropping processing.

[0023] This application provides an electronic device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, it implements the control method of the air conditioning system described above.

[0024] This application provides an air conditioning system, which includes the aforementioned electronic equipment.

[0025] This application provides a computer-readable storage medium storing a computer program that, when executed by one or more processors, implements the above-described control method for an air conditioning system.

[0026] This application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the above-described air conditioning system control method.

[0027] The control device, electronic device, air conditioning system, computer-readable storage medium, and computer program product provided in this application can acquire target operating parameters of the air conditioning system, determine target parameters related to pipe length based on the target operating parameters, and determine the target control cycle of the electronic expansion valve based on the target parameters, so as to control the electronic expansion valve according to the target control cycle. This allows the electronic expansion valve control cycle to be determined based on the pipe length connecting the indoor and outdoor units in the system, achieving a match between the target control cycle of the electronic expansion valve and the pipe length, thus ensuring that the target control cycle of the electronic expansion valve conforms to the actual installation conditions of the pipes within the air conditioning system. Furthermore, compared to controlling the electronic expansion valve with a fixed control cycle, this method can improve, to some extent, issues such as over-adjustment, lag, or slow response under different pipe lengths. In addition, since the target parameters are determined by the current inlet and outlet temperatures of each heat exchanger currently in operation, as well as the current suction pressure of the compressor, the correlation between the target parameters and the pipe length can be guaranteed to a certain extent. Therefore, the effectiveness and reliability of the target control cycle determined by the target parameters can be ensured.

[0028] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein: Figure 1 This is a flowchart illustrating the control method of an air conditioning system in some embodiments of this application; Figure 2 This is a schematic diagram of the control device of the air conditioning system in some embodiments of this application; Figure 3 This is a schematic diagram of an electronic device in some embodiments of this application; Figure 4 This is a schematic diagram of an air conditioning system in some embodiments of this application; Figure 5 This is a flowchart illustrating the control method of an air conditioning system in some embodiments of this application; Figure 6 This is a flowchart illustrating the control method of an air conditioning system in some embodiments of this application; Figure 7This is a flowchart illustrating the control method of an air conditioning system in some embodiments of this application. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0031] Among related technologies, multi-split air conditioning (heat pump) systems have been widely adopted in HVAC applications in commercial and residential buildings due to their flexible design and energy-efficient technology. However, in actual engineering installation and operation, the length of the connecting pipes between the indoor and outdoor units in multi-split air conditioning systems varies significantly due to differences in building structure layout and installation space conditions. These variations in pipe length directly and critically impact the system, affecting refrigerant flow resistance, oil return efficiency, and the overall dynamic response characteristics of the multi-split air conditioning system. Changes in these performance indicators further influence the overall system operation. The electronic expansion valve, as an indispensable key throttling element in a multi-split air conditioning system, directly determines the energy efficiency and operational stability of the entire system through the scientific and rational control strategy. It is a core component ensuring the efficient and stable operation of the multi-split air conditioning system.

[0032] In related technologies, most multi-split air conditioning systems are equipped with electronic expansion valves that use a fixed control cycle. A typical setting is to calculate and adjust the opening of the electronic expansion valve every 30 seconds. Understandably, this single and fixed control cycle strategy has many shortcomings in practical applications and is difficult to adapt to system application scenarios with different pipe lengths.

[0033] For example, in multi-split air conditioning systems with long connecting pipes, significant control lag and operational oscillations can occur. Specifically, when the connecting pipes are long, the refrigerant experiences significant delays and inertia during its flow and phase change within the pipes, drastically reducing the system's response speed to control commands. If a fixed and short control cycle is used to adjust the electronic expansion valve, it will lead to excessively frequent adjustments. Before the multi-split air conditioning system has fully responded to the previous opening change, a new adjustment command is issued. This unreasonable control rhythm easily causes operational oscillations in the entire air conditioning system, such as periodic oscillations in suction superheat and large fluctuations in suction pressure, making it difficult for the system to quickly reach a stable operating state. This not only severely reduces the stability of the multi-split air conditioning system but also causes a significant decline in system energy efficiency. In severe cases, it can even trigger compressor liquid slugging and compressor overheat protection activation, damaging core components and affecting the entire lifespan of the multi-split air conditioning system.

[0034] For example, in multi-split air conditioning systems with short connecting pipes, a sluggish system control response may occur. Specifically, when the connecting pipe length is short, the refrigerant flow path within the pipes is significantly shortened, and the phase change process is more rapid. The entire multi-split air conditioning system exhibits excellent dynamic response capabilities, quickly sensing changes in indoor and outdoor operating conditions. In this application scenario, if the electronic expansion valve still uses a fixed control cycle with an excessively long duration, it will be unable to promptly capture and respond to various changes in operating conditions, such as the start-up and shutdown of indoor units, sudden increases or decreases in indoor heat load, etc. This leads to lag in the system's adjustment actions and low control efficiency. The energy utilization efficiency of the system during the transition phase of operating conditions will be significantly reduced. At the same time, indoor environmental parameters such as temperature and humidity cannot be adjusted in a timely and accurate manner, resulting in a noticeable deterioration in the comfort experience for customers using the multi-split air conditioning system.

[0035] Furthermore, existing control strategies suffer from a significant contradiction between system versatility and operational energy efficiency. Specifically, in order to accommodate the diverse application scenarios of multi-split air conditioning systems in different building structures and installation spaces, air conditioning manufacturers typically choose a conservative, compromise value when setting the control cycle of the electronic expansion valve, attempting to adapt this single value to application scenarios with all pipe lengths.

[0036] Understandably, this approach is unlikely to achieve the desired control effect in practical applications. Specifically, for multi-split air conditioning systems with long connecting pipes, this compromise value still cannot effectively solve the system's control lag and operational oscillations, and the system's operational stability cannot be reliably guaranteed. Moreover, for multi-split air conditioning systems with short connecting pipes, this conservative control cycle limits the system's potential for rapid response, failing to fully leverage the inherent advantage of rapid dynamic response in short-connected systems. Ultimately, this means that multi-split air conditioning systems cannot consistently operate at their optimal energy efficiency state under various piping scenarios, and the system's energy-saving potential cannot be effectively released.

[0037] Based on the issues mentioned above, please refer to Figure 1 This application provides a control method for an air conditioning system, the air conditioning system including an outdoor unit and at least one indoor unit, the outdoor unit and at least one indoor unit being connected by pipes, the outdoor unit including a compressor, and each indoor unit including a heat exchanger and an electronic expansion valve connected to the heat exchanger, the method including: 01: Obtain the target operating parameters of the air conditioning system, including the current inlet temperature, current outlet temperature of each target heat exchanger currently in operation, and the current suction pressure of the compressor; 02: Determine the target parameters related to pipeline length based on the target operating parameters; 03: Determine the target control cycle of the electronic expansion valve based on the target parameters, so as to control the electronic expansion valve according to the target control cycle.

[0038] Please see Figure 2 This application provides a control device 200 for an air conditioning system. The control method for the air conditioning system according to this application can be implemented by the control device 200. Specifically, the control device 200 includes a first acquisition module 210, a parameter determination module 220, and a control module 230. The first acquisition module 210 acquires target operating parameters of the air conditioning system, including the current inlet and outlet temperatures of each target heat exchanger currently in operation, and the current suction pressure of the compressor. The parameter determination module 220 determines target parameters related to the pipe length based on the target operating parameters. The control module 230 determines the target control cycle of the electronic expansion valve based on the target parameters, and controls the electronic expansion valve according to the target control cycle.

[0039] Please see Figure 3This application also provides an electronic device 300, which includes a memory 310 and a processor 320. The control method of the air conditioning system according to this application can be implemented by the electronic device 300. Specifically, the memory 310 stores a computer program 311, and the processor 320 is used to acquire the target operating parameters of the air conditioning system, determine the target parameters related to the pipe length based on the target operating parameters, and determine the target control cycle of the electronic expansion valve based on the target parameters, so as to control the electronic expansion valve according to the target control cycle. The target operating parameters include the current inlet temperature and current outlet temperature of each target heat exchanger currently in operation, and the current suction pressure of the compressor.

[0040] Specifically, considering that electronic expansion valves in multi-split air conditioning systems generally use a fixed control cycle for regulation, and given the significant difference in pipe length between indoor and outdoor units in actual applications, a fixed control cycle cannot adapt to different pipe scenarios. For example, in long pipes, refrigerant flow has a significant delay and inertia; a fixed short cycle would cause the electronic expansion valve to operate too frequently, and the system would receive new commands before fully responding to the previous adjustment, easily leading to system oscillations, pressure fluctuations, and even compressor liquid slugging or overheating protection. Conversely, in short pipes, the system has a faster dynamic response; a fixed long cycle would cause the electronic expansion valve to be unable to respond promptly to changes in indoor and outdoor operating conditions, resulting in sluggish system adjustment, which not only reduces air conditioning energy efficiency but also affects user comfort. Therefore, setting a compromise control cycle to accommodate different scenarios would prevent both long and short pipe scenarios from achieving optimal operating conditions, making it difficult to balance system stability and energy efficiency.

[0041] Based on this, the embodiments of this application provide a control method for air conditioning systems that can adapt to different pipe lengths. Specifically, by obtaining the target operating parameters of the air conditioning system, a target parameter that can directly represent the pipe length is calculated. Then, a target control cycle is matched to the electronic expansion valve according to the target parameter, thereby replacing the fixed control cycle and realizing the dynamic adaptation of the electronic expansion valve control cycle to the actual pipe length, thus solving the problem of setting the control cycle in different piping scenarios.

[0042] In some implementations, the air conditioning system is a multi-split air conditioning (heat pump) system, which is a refrigerant circulation heat exchange system consisting of one outdoor unit and at least one indoor unit. The refrigerant of the indoor and outdoor units is connected through pipelines to complete the heat exchange between the indoor and outdoor units and realize the temperature regulation functions of cooling and heating. It is widely used in commercial and civil buildings.

[0043] In some implementations, the outdoor unit can be understood as an outdoor component of the air conditioning system, used to power the refrigerant circulation, or to perform the compression, condensation, or evaporation of the refrigerant.

[0044] In some examples, the outdoor unit integrates key components such as a compressor, heat exchanger, and various pressure / temperature sensors.

[0045] In some implementations, the indoor unit can be understood as the indoor terminal heat exchange component of the air conditioning system, which can directly exchange heat with the indoor environment. Each indoor unit is equipped with an independent throttling and control component, namely an electronic expansion valve, which can independently adjust the operating status of the indoor unit.

[0046] In some implementations, the electronic expansion valve can be understood as a throttling control element installed in the indoor unit and connected to the heat exchanger. It can adjust the refrigerant circulation flow rate and throttling pressure reduction effect, and directly control the flow state of the refrigerant in the pipeline. The control strategy (such as the control cycle) of the electronic expansion valve is directly related to the energy efficiency and stability of the air conditioning system.

[0047] In some implementations, piping can be understood as refrigerant delivery pipelines connecting the outdoor and indoor units, that is, the channels through which the refrigerant circulates between the indoor and outdoor units. The length of the piping is determined by the building structure and installation space, and this length directly affects the refrigerant flow resistance, oil return efficiency, and system dynamic response characteristics.

[0048] In some implementations, the refrigerant can be understood as the working medium for heat transfer in the air conditioning system, which absorbs and releases heat through a phase change process of vaporization and liquefaction in the system, thereby completing the cooling / heating cycle.

[0049] In some examples, the refrigerant is a coolant.

[0050] In some implementations, the compressor can be understood as the power component of the air conditioning system, used to compress the refrigerant, causing changes in the pressure and temperature of the refrigerant, and driving the refrigerant to complete the phase change cycle in the system. In other words, the compressor is the power source for the refrigerant cycle.

[0051] In some examples, the compressor in the embodiments of this application is a variable frequency compressor.

[0052] In some implementations, a heat exchanger can be understood as a heat exchange component of the indoor unit, used to achieve heat exchange between the refrigerant and the indoor air. The refrigerant can undergo a vaporization or liquefaction phase change in the heat exchanger to complete the heat absorption or release process, thereby achieving indoor temperature control.

[0053] In some implementations, the target operating parameters can be understood as parameters that reflect the system's working status, refrigerant circulation characteristics, and actual pipeline operation during the real-time operation of the air conditioning system. In other words, they are the current inlet plate temperature, current outlet plate temperature, and current suction pressure of the compressor for each heat exchanger currently in operation.

[0054] In some implementations, the current inlet temperature can be understood as the real-time temperature of the heat exchanger coil when the refrigerant enters the indoor unit heat exchanger, which can reflect the initial temperature state of the refrigerant entering the indoor heat exchange process.

[0055] In some implementations, the current outlet temperature can be understood as the real-time temperature of the heat exchanger coil when the refrigerant flows out of the indoor unit heat exchanger. It can reflect the temperature state of the refrigerant after completing the indoor heat exchange process, and when combined with the current inlet temperature, it can demonstrate the heat exchange effect of the heat exchanger.

[0056] In some implementations, the current suction pressure can be understood as the real-time pressure of the refrigerant at the compressor suction port, which can reflect the refrigerant circulation status of the air conditioning system.

[0057] In some implementations, the target parameter can be understood as a quantitative parameter obtained by specific calculation and derivation from the target operating parameters. This parameter is directly related to the pipe length and can characterize the pipe length characteristics between the outdoor unit and the indoor unit.

[0058] In some implementations, the target control cycle can be understood as the control time interval of the electronic expansion valve, that is, the control module of the air conditioning system collects, calculates and adjusts the opening degree of the electronic expansion valve once every time period, which is one of the important indicators of the electronic expansion valve opening adjustment strategy.

[0059] In some implementations, an electronic device can be understood as a single unit or a combination of multiple units within an air conditioning system that possesses control functions. For example, in some examples, the electronic device is a microcontroller unit (MCU) within the air conditioning system.

[0060] For a clearer illustration of the air conditioning system in the embodiments of this application, please refer to [link to relevant documentation]. Figure 4 , Figure 4 A schematic diagram of an air conditioning system provided for an embodiment of this application, i.e., in... Figure 4 The air conditioning system 400 shown consists of one outdoor unit and multiple indoor units. The outdoor unit includes a compressor 401, an oil separator 402, a gas-liquid separator 403, a four-way valve 404, an outdoor unit heat exchanger 405, and a heating electronic expansion valve 406. An exhaust temperature sensor 407 is installed on the exhaust pipe of the compressor 401, an exhaust pressure sensor 408 is installed on the outlet pipe of the gas-liquid separator 403, and an intake pressure sensor 409 is installed on the intake pipe of the compressor 401. The exhaust temperature sensor 407 is used to detect the exhaust temperature of the air conditioning system 400 (or compressor 401) in real time, the exhaust pressure sensor 408 is used to detect the exhaust pressure of the air conditioning system 400 (or gas-liquid separator 403), and the intake pressure sensor 409 is used to detect the intake pressure of the air conditioning system 400 (or compressor 401) unit.

[0061] The air conditioning system 400 includes a first indoor unit, a second indoor unit, ..., an nth indoor unit, and each indoor unit consists of a heat exchanger and an indoor unit electronic expansion valve. For example, the first indoor unit consists of a first heat exchanger 410 and a first indoor unit electronic expansion valve 411, the second indoor unit consists of a second heat exchanger 412 and a second indoor unit electronic expansion valve 413, ..., and the nth indoor unit consists of an nth heat exchanger 414 and an nth indoor unit electronic expansion valve 415.

[0062] Each indoor unit has a heat exchanger inlet plate temperature sensor installed at the inlet and a heat exchanger outlet plate temperature sensor installed at the outlet. For example, the first heat exchanger 410 has a first heat exchanger inlet plate temperature sensor 416 installed at the inlet and a first heat exchanger outlet plate temperature sensor 417 installed at the outlet; the second heat exchanger 412 has a second heat exchanger inlet plate temperature sensor 418 installed at the inlet and a second heat exchanger outlet plate temperature sensor 419 installed at the outlet; the nth heat exchanger 414 has an nth heat exchanger inlet plate temperature sensor 420 installed at the inlet and an nth heat exchanger outlet plate temperature sensor 421 installed at the outlet.

[0063] In such Figure 4 In the example shown, during the operation of the air conditioning system 400, if the first indoor unit, the second indoor unit, ..., the nth indoor unit are all in operation, the electronic equipment can collect the current inlet temperature T1_in and the current outlet temperature T1_out of the first heat exchanger, the current inlet temperature T2_in and the current outlet temperature T2_out of the second heat exchanger, ..., the current inlet temperature Tn_in and the current outlet temperature Tn_out of the Nth heat exchanger through the heat exchanger inlet temperature sensor and the heat exchanger outlet temperature sensor arranged on each indoor unit heat exchanger. Furthermore, the electronic equipment can also collect the current suction pressure Pe of the compressor 401 (or the air conditioning system 400) through the suction pressure sensor 409 arranged on the outdoor unit compressor, and then calculate the target parameters based on Pe, and T1_in, T1_out, T2_in, T2_out, ..., Tn_in, Tn_out.

[0064] To more clearly illustrate the control method of the air conditioning system provided in the embodiments of this application, please refer to [link / reference needed]. Figure 4 And the following exemplary description, namely: During the operation of the air conditioning system 400, if the first indoor unit, the second indoor unit, ..., the nth indoor unit are all in operation, the electronic equipment can collect the current inlet temperature T1_in and the current outlet temperature T1_out of the first heat exchanger, the current inlet temperature T2_in and the current outlet temperature T2_out of the second heat exchanger, ..., the current inlet temperature Tn_in and the current outlet temperature Tn_out of the Nth heat exchanger through the heat exchanger inlet temperature sensor and the heat exchanger outlet temperature sensor arranged on each indoor unit heat exchanger. Furthermore, the electronic equipment can also collect the current suction pressure Pe of the compressor 401 (or the air conditioning system 400) through the suction pressure sensor 409 arranged on the outdoor unit compressor.

[0065] Then, the electronic equipment calculates, derives and processes the collected target operating parameters (i.e., Pe, T1_in, T1_out, T2_in, T2_out, ..., Tn_in, Tn_out) based on a predetermined calculation program or software, thereby establishing a quantitative correlation between the target operating parameters and the pipeline length, thus obtaining the target parameters that can characterize the pipeline length.

[0066] Finally, the electronic device determines the corresponding target control cycle for the electronic expansion valve (i.e., the first indoor unit electronic expansion valve 411, the second indoor unit electronic expansion valve 413, ..., the nth indoor unit electronic expansion valve 415) according to the preset matching rules and the specific values ​​of the target parameters. The control module of the air conditioning system will adjust the opening of the electronic expansion valve according to the target control cycle. That is, every target control cycle, the system parameter acquisition, opening calculation and valve adjustment are completed. Thus, the adaptive matching between the control cycle and the pipeline length is realized.

[0067] Thus, in this embodiment, the target operating parameters of the air conditioning system can be obtained, and based on these parameters, target parameters related to the pipe length can be determined. Furthermore, based on these target parameters, the target control cycle of the electronic expansion valve can be determined, allowing the electronic expansion valve to be controlled according to the target control cycle. This enables the electronic expansion valve control cycle to be determined based on the pipe length connecting the indoor and outdoor units in the system, achieving a match between the target control cycle of the electronic expansion valve and the pipe length. This ensures that the target control cycle of the electronic expansion valve aligns with the actual installation conditions of the pipes within the air conditioning system. Moreover, compared to controlling the electronic expansion valve with a fixed control cycle, this method can improve, to some extent, issues such as over-adjustment, lag, or slow response under different pipe lengths. In addition, since the target parameters are determined using the current inlet and outlet temperatures of each heat exchanger currently in operation, as well as the current suction pressure of the compressor, the correlation between the target parameters and the pipe length can be guaranteed to a certain extent. Therefore, the effectiveness and reliability of the target control cycle determined by the target parameters can be ensured.

[0068] Furthermore, the embodiments of this application can match longer control cycles for long-connected pipe scenarios and shorter control cycles for short-connected pipe scenarios. This avoids phenomena such as suction overheating oscillations and suction pressure fluctuations caused by frequent operation of the electronic expansion valve in long-connected pipe systems, reducing the risk of compressor liquid slugging and overheating protection, and improving the stability and reliability of system operation. Moreover, it can fully utilize the rapid response potential of short-connected pipe systems while ensuring that long-connected pipe systems operate in a stable working state, thereby solving the system energy efficiency loss problem caused by compromised control cycles and enabling the system to operate close to optimal energy efficiency in different piping scenarios.

[0069] Furthermore, the embodiments of this application can also solve the problems of low energy efficiency and large indoor temperature fluctuations during the transition phase caused by slow adjustment in short-connection pipe systems, thereby improving the temperature adjustment comfort of users.

[0070] Furthermore, the implementation method of this application can be achieved by relying on the sensors and control modules of the air conditioning system itself, without the need for additional hardware equipment. It can be completed simply by optimizing the software logic, and has the characteristics of being easy to implement and low cost, so it is suitable for large-scale promotion and application.

[0071] Please see Figure 5 In some embodiments provided in this application, the electronic expansion valve is used to control the flow state of the refrigerant in the pipeline, and thus step 02 above includes: 020: Determine the target evaporation temperature of the refrigerant based on the current inlet and outlet temperatures of each target heat exchanger; 021: Determine the first saturation temperature corresponding to the current inhalation pressure; 022: The difference between the target evaporation temperature and the first saturation temperature is determined as the target parameter.

[0072] The parameter determination module 220 in this embodiment is further configured to determine the target evaporation temperature of the refrigerant based on the current inlet temperature and the current outlet temperature of each target heat exchanger, and to determine the first saturation temperature corresponding to the current suction pressure based on the current suction pressure, and to determine the difference between the target evaporation temperature and the first saturation temperature as the target parameter.

[0073] The processor 320 in this embodiment is further configured to determine the target evaporation temperature of the refrigerant based on the current inlet temperature and the current outlet temperature of each target heat exchanger, and to determine the first saturation temperature corresponding to the current suction pressure based on the current suction pressure, and to determine the difference between the target evaporation temperature and the first saturation temperature as a target parameter.

[0074] Specifically, in order to robustly convert the collected target operating parameters into target parameters that can characterize the pipe length between the indoor unit and the outdoor unit, in some embodiments provided in this application, the target evaporation temperature of the refrigerant can be calculated based on the temperature parameters of the target heat exchanger, and then the compressor suction pressure can be converted into the first saturation temperature of the refrigerant. Finally, the target parameters are obtained by calculating the temperature difference between the two (i.e., the first difference), thereby realizing the conversion of the target operating parameters into target parameters that can characterize the pipe length.

[0075] In some implementations, the refrigerant can be understood as the working medium for heat transfer in the air conditioning system, which absorbs and releases heat through a phase change process of vaporization and liquefaction in the system, thereby completing the cooling / heating cycle.

[0076] In some examples, the refrigerant is a coolant.

[0077] In some implementations, the target evaporation temperature can be understood as the characteristic temperature at which the refrigerant vaporizes and evaporates in the indoor unit's heat exchanger. It can reflect the evaporation and heat exchange state of the refrigerant in the indoor unit and can thus be used to determine the current heat exchange effect of the air conditioning system.

[0078] In some implementations, the first saturation temperature can be understood as the refrigerant saturation temperature corresponding to the current suction pressure of the compressor, reflecting the phase change saturation state of the refrigerant at the current suction pressure.

[0079] In some examples, the first saturation temperature can be calculated from the suction pressure based on the refrigerant's physical properties or by using property software.

[0080] In some implementations, the first difference can be understood as the temperature difference between the target evaporation temperature and the first saturation temperature, which can measure the loss of refrigerant flow in the current pipeline.

[0081] In some implementations, the first difference is positively correlated with the pipe length between the outdoor unit and the indoor unit, and correspondingly, the target parameter is positively correlated with the pipe length between the outdoor unit and the indoor unit.

[0082] In some implementations, the target control cycle can be understood as the control and adjustment cycle of the electronic expansion valve, that is, the time interval between two acquisitions of system operating parameters and adjustment of the opening by the electronic expansion valve. It is one of the core parameters for controlling the operating frequency of the electronic expansion valve and directly affects the adjustment response characteristics of the system.

[0083] In some implementations, the electronic device can be understood as a single unit or a combination of multiple units within an air conditioning system that possesses control functions. For example, in some examples, the electronic device is a microcontroller unit (MCU) within the air conditioning system.

[0084] To more clearly illustrate the control method of the air conditioning system provided in this application, please refer to [link / reference]. Figure 4 And the following exemplary description, namely: During the operation of the air conditioning system 400, if the first indoor unit, the second indoor unit, ..., the nth indoor unit are all in operation, the electronic equipment can collect the current inlet temperature T1_in and current outlet temperature T1_out of the first indoor unit, the current inlet temperature T2_in and current outlet temperature T2_out of the second indoor unit, ..., the current inlet temperature Tn_in and current outlet temperature Tn_out of the nth indoor unit through the heat exchanger inlet temperature sensor and the heat exchanger outlet temperature sensor arranged on the heat exchanger of each indoor unit. Furthermore, the electronic equipment can also collect the current suction pressure Pe of the compressor 401 (or the air conditioning system 400) through the suction pressure sensor 409 arranged on the outdoor unit compressor.

[0085] Next, based on the collected current inlet and outlet temperatures of each target heat exchanger, the electronic equipment uses a pre-determined temperature statistics and calculation method to determine the target evaporation temperature of the refrigerant in the indoor unit via the connecting pipes (i.e., the pipes connecting the outdoor unit 401 and each indoor unit), thereby determining the evaporative heat transfer state of the refrigerant in the indoor unit. Furthermore, based on the refrigerant's physical properties and combined with pre-configured refrigerant property software or conversion formulas, the electronic equipment can convert the collected current compressor suction pressure Pe into the corresponding first saturation temperature Te, thereby determining the phase change saturation state of the refrigerant at the compressor suction end.

[0086] Next, the electronic equipment calculates the first difference between the target evaporation temperature and the first saturation temperature Te, thus obtaining the target parameter. This target parameter can then be used to determine the current actual pipe length of the system, and the corresponding target control cycle of the electronic expansion valve can be matched accordingly. Specifically, a larger target parameter (or first difference) indicates a longer target control cycle, as it corresponds to the pipes connecting the outdoor unit 401 and each indoor unit. Conversely, a smaller target parameter (or first difference) indicates a shorter pipe length, thus requiring a shorter target control cycle.

[0087] Finally, the electronic equipment controls the indoor unit's electronic expansion valve according to the determined target control cycle. That is, it periodically collects the operating parameters of the air conditioning system 400 and adjusts the opening of the electronic expansion valve according to the time interval, thereby achieving adaptive matching between the electronic expansion valve control cycle and the actual pipeline length of the air conditioning system 400.

[0088] Thus, in this embodiment, the target evaporation temperature of the refrigerant can be determined based on the current inlet and outlet temperatures of each target heat exchanger, and the first saturation temperature corresponding to the current suction pressure can be determined based on the current suction pressure. The difference between the target evaporation temperature and the first saturation temperature is then determined as the target parameter, thereby realizing the conversion of the target operating parameters into target parameters that can characterize the pipeline length.

[0089] In some embodiments provided in this application, step 020 includes: determining the average of the current inlet plate temperature and the current outlet plate temperature of the target heat exchanger as the current middle plate temperature of the target heat exchanger; and determining the average of the current middle plate temperatures of each target heat exchanger as the target evaporation temperature.

[0090] The parameter determination module 220 in this embodiment is further configured to determine the average of the current inlet plate temperature and the current outlet plate temperature of the target heat exchanger as the current middle plate temperature of the target heat exchanger; and to determine the average of the current middle plate temperature of each target heat exchanger as the target evaporation temperature.

[0091] The processor 320 in this embodiment is further configured to determine the average of the current inlet plate temperature and the current outlet plate temperature of the target heat exchanger as the current middle plate temperature of the target heat exchanger; and to determine the average of the current middle plate temperatures of each target heat exchanger as the target evaporation temperature.

[0092] Specifically, considering that multiple indoor units often operate simultaneously in an air conditioning system, there are significant differences in the inlet and outlet refrigerant temperatures of a single heat exchanger. Furthermore, the heat exchanger temperatures of different indoor units also vary due to differences in load and location. Therefore, directly using a single value from the heat exchanger inlet and outlet temperatures as the refrigerant evaporation temperature, or directly averaging all inlet and outlet temperatures, will lead to distorted evaporation temperature calculations. This, in turn, will cause deviations in the calculation of subsequent target parameters related to pipe length, ultimately resulting in a mismatch between the electronic expansion valve control cycle and the actual pipe length, leading to problems such as system oscillation, slow response, and reduced energy efficiency.

[0093] Therefore, in some embodiments provided in this application, the electronic device can average the inlet and outlet plate temperatures of a single target heat exchanger under operating conditions to obtain the current middle plate temperature of that single target heat exchanger, thereby eliminating temperature deviations at the inlet and outlet of a single heat exchanger. Furthermore, the electronic device can also average the current middle plate temperatures of target heat exchangers under all operating conditions to eliminate temperature differences among multiple indoor units. The final average value obtained is the target evaporation temperature of the refrigerant, thus providing a reliable temperature parameter basis for subsequent calculations of target parameters.

[0094] In some implementations, the current mid-plate temperature can be understood as the arithmetic mean of the inlet and outlet refrigerant temperatures of the target heat exchanger under a single operating condition, which can be used to characterize the average heat exchange temperature of the refrigerant in a single indoor unit heat exchanger.

[0095] To more clearly illustrate the process of obtaining the target evaporation temperature in the embodiments of this application, please refer to [link to relevant documentation]. Figure 4 And the following exemplary description, namely: During the operation of the air conditioning system 400, if the first indoor unit, the second indoor unit, ..., the nth indoor unit are all in working condition, the electronic equipment can collect the current inlet temperature T1_in and the current outlet temperature T1_out of the first indoor unit, the current inlet temperature T2_in and the current outlet temperature T2_out of the second indoor unit, ..., the current inlet temperature Tn_in and the current outlet temperature Tn_out of the nth indoor unit through the heat exchanger inlet temperature sensor and the heat exchanger outlet temperature sensor arranged on the heat exchanger of each indoor unit.

[0096] Next, the electronic equipment can calculate the current mid-plate temperature T1_mid of the first heat exchanger based on the current inlet plate temperature T1_in and the current outlet plate temperature T1_out of the first indoor unit, where T1_mid = (T1_in + T1_out) / 2. Similarly, the electronic equipment can calculate the current mid-plate temperatures of other indoor unit heat exchangers in operation, such as the current mid-plate temperature T2_mid of the second heat exchanger and the current mid-plate temperature T2_out of the nth heat exchanger, ..., the current inlet plate temperature Tn_in and the current outlet plate temperature Tn_out of the Nth heat exchanger, where T2_mid = (T2_in + T2_out) / 2 and Tn_mid = (Tn_in + Tn_out) / 2.

[0097] Finally, the electronic device can calculate the average value of the current mid-plate temperature of each indoor unit heat exchanger that is currently in operation, i.e. (T1_mid+T2_mid+…+Tn_mid) / n, thereby obtaining the target evaporation temperature.

[0098] Thus, in this embodiment, the average of the current inlet plate temperature and the current outlet plate temperature of the target heat exchanger can be determined as the current middle plate temperature of the target heat exchanger, and the average of the current middle plate temperature of each target heat exchanger can be determined as the target evaporation temperature, thereby achieving robust determination of the target evaporation temperature.

[0099] In some embodiments provided in this application, step 03 includes: determining a first preset period as a target control period when the target parameter is greater than or equal to a first preset temperature value; determining a second preset period as a target control period when the target parameter is greater than a second preset temperature value and less than the first preset temperature value, wherein the first preset period is greater than the second preset period; determining a third preset period as a target control period when the target parameter is greater than a third preset temperature value and less than or equal to the second preset temperature value, wherein the second preset period is greater than the third preset period; and determining a fourth preset period as a target control period when the target parameter is less than or equal to the third preset temperature value, wherein the third preset period is greater than the fourth preset period.

[0100] The control module in this embodiment is further configured to determine a first preset period as a target control period when the target parameter is greater than or equal to a first preset temperature value, and to determine a second preset period as a target control period when the target parameter is greater than a second preset temperature value and less than the first preset temperature value, and to determine a third preset period as a target control period when the target parameter is greater than a third preset temperature value and less than or equal to the second preset temperature value, and to determine a fourth preset period as a target control period when the target parameter is less than or equal to the third preset temperature value, wherein the first preset period is greater than the second preset period, the second preset period is greater than the third preset period, and the third preset period is greater than the fourth preset period.

[0101] The processor 320 in this embodiment is further configured to determine a first preset period as a target control period when the target parameter is greater than or equal to a first preset temperature value, and to determine a second preset period as a target control period when the target parameter is greater than a second preset temperature value and less than the first preset temperature value, and to determine a third preset period as a target control period when the target parameter is greater than a third preset temperature value and less than or equal to the second preset temperature value, and to determine a fourth preset period as a target control period when the target parameter is less than or equal to the third preset temperature value, wherein the first preset period is greater than the second preset period, the second preset period is greater than the third preset period, and the third preset period is greater than the fourth preset period.

[0102] Specifically, considering that the length of the connecting pipes between the indoor and outdoor units of an air conditioning system (i.e., the pipes used to connect the outdoor unit to each indoor unit) varies significantly depending on the installation scenario, the pipe length directly affects refrigerant flow resistance, oil return efficiency, and system dynamic response characteristics. A fixed electronic expansion valve control cycle cannot adapt to all piping scenarios. For example, long connecting pipes require long control cycles to avoid system oscillations, while short connecting pipes require short control cycles to ensure timely adjustment. A compromise control cycle would result in long connecting pipe systems remaining unstable and short connecting pipe systems exhibiting slow response, preventing the system from maintaining optimal energy efficiency and control stability under different piping scenarios.

[0103] Based on this, in some embodiments provided in this application, the electronic device can use the target parameter characterizing the pipe length (i.e., the first difference between the target evaporation temperature and the first saturation temperature) as the core basis, combined with three preset temperature values, to divide the target parameter into four non-overlapping numerical intervals, and match a corresponding preset control cycle to each interval. Thus, the target control cycle of the electronic expansion valve can be directly determined by the interval assignment of the target parameter, achieving precise matching between the control cycle and the pipe length. The duration of different preset control cycles is positively correlated with the magnitude of the target parameter.

[0104] In some implementations, the first preset temperature value can be understood as a temperature threshold pre-calibrated experimentally, which can be used to determine whether the pipe length is of an extra-long grade.

[0105] In some implementations, the second preset temperature value can be understood as a calibration temperature threshold between the first preset temperature value and the third preset temperature value, which can be used to distinguish between medium-length connecting pipes and medium-length connecting pipes.

[0106] In some implementations, the third preset temperature value can be understood as a pre-calibrated temperature threshold in the air conditioning control system. It is a critical value for determining whether the pipe length is a short pipe and provides a reference standard for the division of the lowest level range of the target parameter.

[0107] In some implementations, the first preset cycle can be understood as the basic control cycle of the electronic expansion valve matched for ultra-long connecting pipe scenarios. It is the longest cycle value among the four preset cycles, which is adapted to the large hysteresis characteristics of refrigerant flow under ultra-long connecting pipes.

[0108] In some implementations, the second preset cycle can be understood as the basic control cycle of the electronic expansion valve matched for medium- and long connecting pipe scenarios. The duration is shorter than the first preset cycle and longer than the third preset cycle, adapting to the refrigerant flow hysteresis characteristics of medium- and long connecting pipes.

[0109] In some implementations, the third preset period can be understood as the basic control period of the electronic expansion valve matched for medium-sized pipe scenarios. Its duration is shorter than the second preset period and longer than the fourth preset period, adapting to the dynamic response characteristics of the medium-sized pipe system.

[0110] In some implementations, the fourth preset cycle can be understood as the basic control cycle of the electronic expansion valve matched for short-connection scenarios. It is the shortest cycle value among the four preset cycles, which is adapted to the fast dynamic response characteristics of the system under short-connection scenarios.

[0111] To more clearly illustrate the process of determining the target control period in the embodiments of this application, please refer to [link / reference needed]. Figure 4 And the following exemplary description, namely: During the operation of the air conditioning system 400, if the first indoor unit, the second indoor unit, ..., the nth indoor unit are all in operation, the electronic equipment can collect the current inlet temperature T1_in and current outlet temperature T1_out of the first indoor unit, the current inlet temperature T2_in and current outlet temperature T2_out of the second indoor unit, ..., the current inlet temperature Tn_in and current outlet temperature Tn_out of the nth indoor unit through the heat exchanger inlet temperature sensor and heat exchanger outlet temperature sensor arranged on each indoor unit heat exchanger, and then calculate the current temperature of the first heat exchanger. After determining the temperatures of the front and middle heat exchangers (T1_mid), the current middle heat exchanger temperature (T2_mid), ..., the current middle heat exchanger temperature of the nth heat exchanger (Tn_mid), the average value of the current middle heat exchanger temperature of each indoor unit currently in operation is calculated, i.e., Tave_mid, where Tave_mid = (T1_mid + T2_mid + ... + Tn_mid) / n. This yields the target evaporation temperature. Then, the first difference between the target evaporation temperature (Tave_mid) and the first saturation temperature Te is calculated, i.e., (Tave_mid - Te). This gives the target parameters. Subsequently, the electronic device can determine whether the target parameter is greater than or equal to the first preset temperature T1. If yes, the electronic device executes branch one; if no, the electronic device executes branch two.

[0112] Branch 1: Control the electronic expansion valve control module to start a timer P1_base so that the electronic expansion valve control module controls the electronic expansion valve in the P1_base cycle.

[0113] Branch 2: Determine whether the target parameter falls within the range of (second preset temperature T2, first preset temperature T1). If yes, the electronic device executes Branch 3; otherwise, the electronic device executes Branch 4.

[0114] Branch 3: The electronic expansion valve control module starts a P2_base timer so that the electronic expansion valve control module controls the electronic expansion valve in the P2_base cycle.

[0115] Branch 4: Determine whether the target parameter falls within the range of [third preset temperature T3, first preset temperature T2]. If yes, the electronic device executes Branch 5; otherwise, the electronic device executes Branch 6.

[0116] Branch 5: Control the electronic expansion valve control module to start a P3_base timer so that the electronic expansion valve control module controls the electronic expansion valve in the P3_base cycle.

[0117] Branch 6: Control the electronic expansion valve control module to start a P4_base timer so that the electronic expansion valve control module controls the electronic expansion valve in the P4_base cycle.

[0118] In branches one through six above, T1 > T2 > T3, and P1_base > P2_base > P3_base > P4_base. It is understandable that a larger target parameter indicates a longer connecting pipe within the system. Therefore, the adjustment cycle of the electronic expansion valve in the indoor unit should be longer to accommodate the lag in system parameter changes under long connecting pipe scenarios and prevent over-adjustment.

[0119] Thus, in this embodiment, when the target parameter is greater than or equal to the first preset temperature value, the first preset period can be determined as the target control period; when the target parameter is greater than the second preset temperature value and less than the first preset temperature value, the second preset period can be determined as the target control period; when the target parameter is greater than the third preset temperature value and less than or equal to the second preset temperature value, the third preset period can be determined as the target control period; and when the target parameter is less than or equal to the third preset temperature value, the fourth preset period can be determined as the target control period, thereby completing the determination of the target control period.

[0120] Please see Figure 6 In some embodiments provided in this application, the outdoor unit includes a compressor, and therefore the control method of the air conditioning system further includes: 04: Under the condition of controlling the electronic expansion valve according to the target control cycle, obtain the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle; 05: Based on the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle, the target control cycle is corrected to obtain the corrected control cycle, and the electronic expansion valve is controlled according to the corrected control cycle.

[0121] The control device 200 provided in this embodiment further includes a second acquisition module and a period correction module. The second acquisition module is used to acquire the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle when controlling the electronic expansion valve according to the target control cycle. The period correction module is used to correct the target control cycle according to the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle to obtain a corrected control cycle, so as to control the electronic expansion valve according to the corrected control cycle.

[0122] The processor 320 in this embodiment is further configured to, when controlling the electronic expansion valve according to the target control cycle, acquire the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle, and, based on the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle, perform correction processing on the target control cycle to obtain a corrected control cycle, so as to control the electronic expansion valve according to the corrected control cycle.

[0123] Specifically, considering that air conditioning systems are affected by various dynamic factors during actual operation, such as sudden changes in indoor load, changes in outdoor ambient temperature, and fluctuations in refrigerant flow, the target control cycle determined solely by target parameters related to pipeline length may not be able to adapt to the dynamic operating state of the system in real time. This can lead to a disconnect between the control cycle and the actual operating requirements of the system, resulting in oscillations in system operating parameters, slow response, and other issues that affect the overall operational stability and energy efficiency of the system.

[0124] Based on this, in some embodiments provided in this application, the electronic device can collect the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle, process the collected parameters, and thereby make targeted corrections to the initial target control cycle. This results in a corrected control cycle that fits the actual operating state of the system, and the corrected control cycle is used as a new basis to control the electronic expansion valve, thereby achieving dynamic optimization of the electronic expansion valve control cycle. This makes the control strategy both match the static attribute of pipeline length and adapt to the real-time operating state of the air conditioning system.

[0125] In some implementations, the exhaust pressure can be understood as the pressure of the refrigerant at the compressor exhaust port in the outdoor unit of the air conditioning system, which can reflect the compressor's operating status, the system's refrigerant circulation rate, and the heat exchange status of the pipeline.

[0126] In some implementations, exhaust temperature can be understood as the temperature of the refrigerant at the compressor exhaust port in the outdoor unit of the air conditioning system, which can reflect the compressor's workload, system heat exchange efficiency, and refrigerant phase change state.

[0127] In some implementations, the correction process can be understood as the process of adjusting and optimizing the initial target control cycle determined based on the target parameters (or pipeline length) through predetermined calculation logic or logical judgment, based on the collected compressor discharge pressure and discharge temperature.

[0128] In some implementations, the modified control cycle can be understood as a new electronic expansion valve control cycle obtained after modification, which is the optimized result of the initial target control cycle, and is used for subsequent adjustment of the opening degree and operation control of the electronic expansion valve.

[0129] To more clearly illustrate the correction process for the target control cycle in the embodiments of this application, please refer to... Figure 4 And the following exemplary description, namely: After the electronic equipment completes the acquisition of the target operating parameters of the air conditioning system 400, the determination of the target parameters (or the first difference) related to the pipe length, the determination of the initial target control cycle of the electronic expansion valve (i.e., the first indoor unit electronic expansion valve 411, the second indoor unit electronic expansion valve 413, ..., the nth indoor unit electronic expansion valve 415), and controls the air conditioning system 400 to control the operating state of the electronic expansion valve according to the initial target control cycle, during the operation of the air conditioning system 400 according to the initial target control cycle, the exhaust temperature and intake pressure of the air conditioning system 400 under the target control cycle are collected through the exhaust temperature sensor 407 and the intake pressure sensor 409.

[0130] Then, based on the collected exhaust pressure and exhaust temperature, the exhaust pressure and exhaust temperature are analyzed through a predetermined data processing method. At the same time, combined with the operating rules of the air conditioning system 400 and the physical properties of the refrigerant, it is determined whether there are problems such as parameter oscillation or slow response of the air conditioning system 400 under the current control cycle. Based on the judgment results, the corresponding adjustment logic is determined, and the initial target control cycle is calculated and adjusted, thereby completing the correction process of the initial target control cycle.

[0131] Finally, the corrected control cycle obtained after the correction process is used as the new control basis for the electronic expansion valves (i.e., the first indoor unit electronic expansion valve 411, the second indoor unit electronic expansion valve 413, ..., the nth indoor unit electronic expansion valve 415). Subsequently, the opening degree calculation and adjustment command sending of the electronic expansion valves are performed according to this corrected control cycle. This correction process can be carried out cyclically as the system continues to run, thereby realizing dynamic iterative optimization of the control cycle.

[0132] Thus, in this embodiment, when the electronic expansion valve is controlled according to the target control cycle, the discharge pressure and discharge temperature of the compressor under the target control cycle can be obtained, and the target control cycle can be corrected according to the discharge pressure and discharge temperature of the compressor under the target control cycle to obtain a corrected control cycle. The electronic expansion valve can then be controlled according to the corrected control cycle. This allows the control cycle of the electronic expansion valve to be corrected by the discharge pressure and discharge temperature of the outdoor unit compressor, thereby enabling the control cycle of the electronic expansion valve to match the real-time operating status of the air conditioning system. This allows the control cycle of the electronic expansion valve to match both the static attribute of the pipeline length and the real-time operating status of the air conditioning system.

[0133] Please see Figure 7 In some embodiments provided in this application, step 05 includes: 050: Determine the second saturation temperature of the air conditioning system under the target control cycle based on the exhaust pressure of the air conditioning system under the target control cycle; 051: The difference between the exhaust temperature and the second saturation temperature of the air conditioning system under the target control cycle is determined as the exhaust superheat of the air conditioning system under the target control cycle; 052: Based on the exhaust superheat of the air conditioning system under the target control cycle, the target control cycle is corrected to obtain the corrected control cycle, and the electronic expansion valve is controlled according to the corrected control cycle.

[0134] The cycle correction module in this application embodiment is further used to determine the second saturation temperature of the air conditioning system under the target control cycle based on the exhaust pressure of the air conditioning system under the target control cycle, and to determine the difference between the exhaust temperature of the air conditioning system under the target control cycle and the second saturation temperature as the exhaust superheat of the air conditioning system under the target control cycle, and to correct the target control cycle based on the exhaust superheat of the air conditioning system under the target control cycle to obtain a corrected control cycle, so as to control the electronic expansion valve according to the corrected control cycle.

[0135] The processor 320 in this embodiment is further configured to determine the second saturation temperature of the air conditioning system under the target control cycle based on the exhaust pressure of the air conditioning system under the target control cycle, and to determine the difference between the exhaust temperature of the air conditioning system under the target control cycle and the second saturation temperature as the exhaust superheat of the air conditioning system under the target control cycle, and to perform correction processing on the target control cycle based on the exhaust superheat of the air conditioning system under the target control cycle to obtain a corrected control cycle, so as to control the electronic expansion valve according to the corrected control cycle.

[0136] Specifically, in order to accurately correct the target control cycle and ensure that the corrected control cycle obtained by the correction process can accurately match the actual operating state of the air conditioning system, in some embodiments provided in this application, the exhaust pressure collected under the target control cycle can be converted into a second saturation temperature through refrigerant property conversion logic. Then, the difference between the exhaust temperature and the second saturation temperature is calculated by numerical calculation to obtain the exhaust superheat of the air conditioning system. This exhaust superheat is used as the basis for correction to correct the target control cycle of the electronic expansion valve, thereby obtaining a corrected control cycle that adapts to the real-time operating state of the air conditioning system, and then controlling the operation of the electronic expansion valve in the indoor unit.

[0137] In some implementations, the second saturation temperature can be understood as the refrigerant saturation temperature corresponding to the exhaust pressure of the air conditioning system under the current target control cycle, which is the critical temperature at which the refrigerant undergoes a gas-liquid phase change at that exhaust pressure.

[0138] In some examples, the discharge pressure can be converted into a second saturation temperature based on predetermined calculation logic or property software that reflects the physical properties of the refrigerant.

[0139] In some implementations, exhaust superheat can be understood as the numerical difference between the exhaust temperature of the air conditioning system under the target control cycle and the corresponding second saturation temperature, which can reflect the state of the refrigerant at the compressor exhaust end, the system heat exchange efficiency, and the stability of the refrigerant cycle.

[0140] To more clearly illustrate the correction process of the target control cycle in the embodiments of this application, please refer to the following exemplary description: When the electronic expansion valve in the indoor unit operates according to the target control cycle, the electronic device continuously collects the exhaust pressure and exhaust temperature T_dis of the air conditioning system under the target control cycle.

[0141] Next, the electronic equipment performs refrigerant property conversion processing on the collected exhaust pressure under the target control cycle. Combining the inherent physical properties of the refrigerant used in the air conditioning system, the second saturation temperature Tc corresponding to the exhaust pressure is determined by a pre-determined refrigerant property calculation method or property software.

[0142] Then, the numerical difference between the exhaust temperature T_dis under the target control cycle and the converted second saturation temperature Tc is calculated. The exhaust superheat Tsh of the air conditioning system under the target control cycle is obtained by subtracting the second saturation temperature Tc from the exhaust temperature T_dis, i.e., Tsh = T_dis - Tc.

[0143] Then, using the calculated exhaust superheat Tsh as the correction basis, the target control cycle of the electronic expansion valve is corrected according to the preset correction rules to obtain the corrected control cycle adapted to the current operating state of the system.

[0144] Finally, the control cycle of the electronic expansion valve is switched from the previous target control cycle to the correction control cycle, and the opening degree of the electronic expansion valve is adjusted and controlled according to the correction control cycle.

[0145] Thus, in this embodiment, the second saturation temperature of the air conditioning system under the target control cycle can be determined based on the exhaust pressure of the air conditioning system under the target control cycle. The difference between the exhaust temperature and the second saturation temperature under the target control cycle is determined as the exhaust superheat of the air conditioning system under the target control cycle. Based on the exhaust superheat of the air conditioning system under the target control cycle, the target control cycle is corrected to obtain a corrected control cycle. The electronic expansion valve is then controlled according to the corrected control cycle. This allows the exhaust temperature and exhaust pressure to be converted into exhaust superheat, thereby characterizing the real-time operating status of the air conditioning system. It also accurately reflects the phase state of the refrigerant at the compressor exhaust end, the heat exchange efficiency of the system, and the refrigerant cycle stability. The corrected control cycle is then used to ensure that it reliably matches the actual operating requirements of the system, guaranteeing the correction effect and the control accuracy of the electronic expansion valve.

[0146] In some embodiments provided in this application, step 052 includes: determining the maximum and minimum exhaust superheat within multiple consecutive target control cycles based on the exhaust superheat of the air conditioning system within multiple consecutive target control cycles; determining a cycle correction coefficient based on a second difference between the maximum and minimum exhaust superheat; and correcting the target control cycle based on the cycle correction coefficient to obtain a corrected control cycle, so as to control the electronic expansion valve according to the corrected control cycle.

[0147] The cycle correction module in this application embodiment is further used to determine the maximum and minimum exhaust superheat within multiple consecutive target control cycles based on the exhaust superheat of the air conditioning system within multiple consecutive target control cycles, and to determine the cycle correction coefficient based on the second difference between the maximum and minimum exhaust superheat, and to correct the target control cycle based on the cycle correction coefficient to obtain the corrected control cycle, so as to control the electronic expansion valve according to the corrected control cycle.

[0148] The processor 320 in this embodiment is further configured to determine the maximum and minimum exhaust superheat within a series of target control cycles based on the exhaust superheat of the air conditioning system within a series of target control cycles, determine a cycle correction coefficient based on a second difference between the maximum and minimum exhaust superheat, and perform correction processing on the target control cycle based on the cycle correction coefficient to obtain a corrected control cycle, so as to control the electronic expansion valve according to the corrected control cycle.

[0149] Specifically, considering that directly correcting the target control cycle based on the exhaust superheat under a single target control cycle may result in distortion due to occasional parameter fluctuations, sensor instantaneous errors, and other factors, failing to accurately reflect the actual operational fluctuation trend of the air conditioning system, and thus leading to over-adjustment or under-adjustment of the control cycle, the electronic device can select multiple consecutive target control cycles as statistical samples. The maximum and minimum values ​​of exhaust superheat within these samples are extracted, and a second difference between the two values ​​is calculated to quantify the overall fluctuation range of the air conditioning system parameters. Then, a corresponding cycle correction coefficient is matched based on the second difference, and finally, this coefficient is used to correct the original target control cycle, resulting in a corrected control cycle that matches the actual fluctuation state of the air conditioning system. This transforms the basis for control cycle correction from a single-cycle, random parameter change to a multi-cycle, overall fluctuation trend, thereby ensuring the accuracy of the correction.

[0150] In some implementations, multiple consecutive target control cycles can be understood as a set of cycles selected by statistically analyzing the overall fluctuation trend of exhaust superheat, with the number within a preset range, rather than a single independent cycle.

[0151] In some examples, the electronic device can collect exhaust temperature and exhaust pressure under N consecutive target control cycles, thereby obtaining N exhaust superheat values ​​under these N consecutive target control cycles, and using these N exhaust superheat values ​​to calculate the maximum and minimum exhaust superheat values. The value of N ranges from (3, 8), and N is a positive integer.

[0152] In some implementations, the maximum exhaust superheat can be understood as the maximum value among the exhaust superheat values ​​calculated in each of the selected consecutive target control cycles, which can reflect the peak operating state of exhaust superheat in the consecutive target control cycles.

[0153] In some implementations, the minimum exhaust superheat can be understood as the minimum value among the exhaust superheat values ​​calculated in each of the selected consecutive target control cycles, which can reflect the valley value operation state of exhaust superheat in the consecutive target control cycles.

[0154] In some implementations, the second difference can be understood as the numerical difference between the maximum exhaust superheat and the minimum exhaust superheat, which can characterize the fluctuation range of exhaust superheat over multiple consecutive target control cycles.

[0155] In some implementations, the period correction coefficient can be understood as a pre-set proportional coefficient used to adjust the original target control period based on the value of the second difference.

[0156] In some implementations, the periodic correction factor is positively correlated with the second difference.

[0157] In some examples, the periodic correction factor ranges from 1 to 1.5.

[0158] In some examples, the periodic correction factor ranges from 1.0 to 1.2.

[0159] In some examples, the periodic correction factor ranges from 0.5 to 1.

[0160] In some implementations, based on the exhaust temperature and exhaust pressure under N consecutive target control cycles, N exhaust superheats Tsh are calculated for N consecutive target control cycles. The maximum exhaust superheat Tsh_Max and the minimum exhaust superheat Tsh_Min are then calculated using these N exhaust superheats Tsh, and a second difference between the maximum and minimum exhaust superheats is calculated. After Tsh (i.e., Tsh_Max-Tsh_Min), if If Tsh is too high, it indicates that the current target control cycle is too short, causing the electronic expansion valve to operate too frequently. The air conditioning system hasn't had time to fully respond to the previous valve opening change before a new adjustment command is issued, resulting in system parameter oscillations. Therefore, it's necessary to extend the target control cycle to correct this. Conversely, A smaller Tsh indicates that the current electronic expansion valve control cycle is too long, resulting in a sluggish response of the air conditioning system to load changes and untimely adjustments. This leads to large temperature fluctuations and poor comfort at the customer end, and poor performance under rapid load changes. Therefore, it is necessary to shorten the target control cycle to achieve the correction.

[0161] Thus, in this embodiment, the maximum and minimum exhaust superheat of the air conditioning system within multiple consecutive target control cycles can be determined based on the exhaust superheat of the air conditioning system. A cycle correction coefficient is then determined based on the second difference between the maximum and minimum exhaust superheat. The target control cycle is then corrected based on the cycle correction coefficient to obtain a corrected control cycle. The electronic expansion valve is controlled according to this corrected control cycle. This allows for the calculation of the second difference by statistically analyzing the extreme values ​​of exhaust superheat over multiple consecutive cycles, thereby determining the fluctuation range of exhaust superheat over multiple consecutive cycles. This is used as a basis to correct the control cycle of the electronic expansion valve, making the correction basis for the control cycle more objective and comprehensive, and ensuring the reliability and effectiveness of the correction process.

[0162] In some embodiments provided in this application, the step of determining the periodic correction coefficient based on the second difference between the maximum and minimum exhaust superheat includes: determining the first preset coefficient as the periodic correction coefficient when the second difference is greater than or equal to the first preset exhaust superheat threshold; determining the second preset coefficient as the periodic correction coefficient when the second difference is greater than the second preset exhaust superheat threshold and less than the first preset exhaust superheat threshold, wherein the first preset coefficient is greater than the second preset coefficient; and determining the third preset coefficient as the periodic correction coefficient when the second difference is less than or equal to the second preset exhaust superheat threshold, wherein the second preset coefficient is greater than the third preset coefficient.

[0163] The periodic correction module in this application embodiment is further configured to: determine a first preset coefficient as a periodic correction coefficient when the second difference is greater than or equal to a first preset exhaust superheat threshold; determine a second preset coefficient as a periodic correction coefficient when the second difference is greater than a second preset exhaust superheat threshold but less than a first preset exhaust superheat threshold; and determine a third preset coefficient as a periodic correction coefficient when the second difference is less than or equal to a second preset exhaust superheat threshold. Wherein, the first preset coefficient is greater than the second preset coefficient; and the second preset coefficient is greater than the third preset coefficient.

[0164] The processor 320 in this embodiment is further configured to: determine a first preset coefficient as a periodic correction coefficient when the second difference is greater than or equal to a first preset exhaust superheat threshold; determine a second preset coefficient as a periodic correction coefficient when the second difference is greater than a second preset exhaust superheat threshold but less than a first preset exhaust superheat threshold; and determine a third preset coefficient as a periodic correction coefficient when the second difference is less than or equal to a second preset exhaust superheat threshold. Wherein, the first preset coefficient is greater than the second preset coefficient; and the second preset coefficient is greater than the third preset coefficient.

[0165] Specifically, in order to efficiently determine the periodic correction coefficient, in some embodiments provided in this application, two preset thresholds of different sizes can be set for the second difference of exhaust superheat, thereby dividing the range of the second difference into three non-overlapping intervals: large fluctuation, medium fluctuation, and small fluctuation. A unique corresponding gradient preset coefficient is preset for each interval, and the magnitude of the preset coefficient is positively correlated with the degree of fluctuation of the second difference. Thus, the interval determination can be completed by comparing the actual calculated second difference with the preset threshold, and the periodic correction coefficient can be determined according to the one-to-one correspondence between the interval and the coefficient, thereby achieving efficient determination of the correction coefficient.

[0166] In some implementations, the first preset exhaust superheat threshold can be understood as a pre-set exhaust superheat fluctuation threshold, which can be used to determine whether the air conditioning system has significant parameter oscillations.

[0167] In some examples, the first preset exhaust superheat threshold value ranges from [8℃, 15℃].

[0168] In some implementations, the second preset exhaust superheat threshold can be understood as another pre-set exhaust superheat fluctuation threshold, and the second preset exhaust superheat threshold is less than the first preset exhaust superheat threshold.

[0169] In some examples, the second preset exhaust superheat threshold value ranges from [2℃, 5℃].

[0170] In some implementations, the first preset coefficient can be understood as a pre-set periodic correction coefficient that matches the large fluctuation range of exhaust superheat, which can significantly adjust the duration of the electronic expansion valve control cycle.

[0171] In some implementations, the second preset coefficient can be understood as a pre-set periodic correction coefficient that matches the moderate fluctuation range of exhaust superheat, which can slightly adjust the duration of the electronic expansion valve control cycle. The second preset coefficient is smaller than the first preset coefficient.

[0172] In some implementations, the third preset coefficient can be understood as a pre-set periodic correction coefficient that matches the small fluctuation range of exhaust superheat, which can finely adjust the duration of the electronic expansion valve control cycle. The third preset coefficient is smaller than the second preset coefficient.

[0173] To more clearly illustrate the control cycle correction process in the embodiments of this application, please refer to [link / reference needed]. Figure 4 And the following exemplary description, namely: When or after acquiring the exhaust temperature T_dis and intake pressure for N consecutive target control cycles, the saturation temperature corresponding to each intake pressure is calculated using pre-configured property software, thus obtaining the second saturation temperature Tc for N consecutive target control cycles. Here, N ranges from (3, 8). Subsequently, for each of these N target control cycles, the difference between the exhaust temperature T_dis and the second saturation temperature Tc in each cycle is calculated, thereby obtaining the exhaust superheat Tsh in each cycle, i.e., Tsh = Tdis - Tc, for a total of N exhaust superheat Tsh.

[0174] Then, for these N exhaust superheat values ​​Tsh, search for the maximum value Tsh_Max and the minimum value Tsh_Min among these N exhaust superheat values ​​Tsh, and calculate the difference between Tsh_Max and Tsh_Min, thereby obtaining the exhaust superheat fluctuation value. Tsh (also known as the second difference), Tsh = Tsh_Max - Tsh_Min.

[0175] Subsequently, the judgment Is Tsh greater than or equal to the first preset exhaust superheat threshold? Tsh_1. If yes, proceed to step one; if no, proceed to step two. Otherwise, go to S10. The first preset exhaust superheat threshold is... The value range of Tsh_1 is [8℃, 15℃].

[0176] Step 1: Correct the target control cycle using the first preset correction coefficient k1. The value of k1 ranges from (1, 1.5).

[0177] Step 1: Judgment Is Tsh greater than the second preset exhaust superheat threshold? Tsh_2, and simultaneously less than the first preset exhaust superheat threshold. Tsh_1. If yes, proceed to step three; otherwise, proceed to step four. The first preset exhaust superheat threshold is... The value range of Tsh_1 is [2℃, 5℃].

[0178] Step 3: Correct the target control cycle using the second preset correction coefficient k2. Here, k1 is greater than k2, and the value of k2 ranges from (1.0 to 1.2).

[0179] Step 4: Correct the target control cycle using the third preset correction coefficient k3. Here, k2 is greater than k3, and the value of k3 ranges from (0.5, 1).

[0180] Finally, the opening of the electronic expansion valve is adjusted by the modified target control cycle (i.e., the modified control cycle). That is, every cycle, the complete action of system parameter acquisition, opening calculation and valve adjustment is completed.

[0181] Thus, in this embodiment of the application, when the second difference is greater than or equal to the first preset exhaust superheat threshold, the first preset coefficient can be determined as the periodic correction coefficient; when the second difference is greater than the second preset exhaust superheat threshold and less than the first preset exhaust superheat threshold, the second preset coefficient can be determined as the periodic correction coefficient; and when the second difference is less than or equal to the second preset exhaust superheat threshold, the third preset coefficient can be determined as the periodic correction coefficient, thereby achieving efficient determination of the periodic correction coefficient.

[0182] In some embodiments provided in this application, the step of correcting the target control period according to the period correction coefficient to obtain a corrected control period, and controlling the electronic expansion valve according to the corrected control period, includes: determining the product of the period correction coefficient and the target control period as the corrected control period, and controlling the electronic expansion valve according to the corrected control period.

[0183] The cycle correction module in this application embodiment is also used to determine the correction control cycle by multiplying the cycle correction coefficient and the target control cycle, so as to control the electronic expansion valve according to the correction control cycle.

[0184] The processor 320 in this embodiment is further configured to determine the product of the period correction coefficient and the target control period as the correction control period, so as to control the electronic expansion valve according to the correction control period.

[0185] Specifically, in order to achieve efficient correction of the target control cycle, in some embodiments provided in this application, the electronic device can calculate the product of the cycle correction coefficient and the target control cycle, and directly use the result as the final corrected control cycle. Then, the opening adjustment of the electronic expansion valve can be performed according to the corrected control cycle, thereby simplifying and improving the efficiency of the control cycle correction process.

[0186] For example, if the target control cycle is P1_base as in the previous example and the cycle correction coefficient is k1 as in the previous example, the electronic device can calculate the product of P1_base and k1, i.e., P1_base*k1, and control the electronic expansion valve in the indoor unit according to the cycle of P1_base*k1.

[0187] Thus, in the embodiments of this application, the product of the period correction coefficient and the target control period can be determined as the correction control period, so as to control the electronic expansion valve according to the correction control period, thereby achieving efficient determination of the correction control period.

[0188] Furthermore, for a clearer explanation of the control method for the air conditioning system provided in this application, please refer to [link to relevant documentation]. Figure 4 And the following exemplary description, namely: During the operation of the air conditioning system 400, if the first indoor unit, the second indoor unit, ..., the nth indoor unit are all in operation, the electronic equipment can collect the current inlet temperature T1_in and current outlet temperature T1_out of the first indoor unit, the current inlet temperature T2_in and current outlet temperature T2_out of the second indoor unit, ..., the current inlet temperature Tn_in and current outlet temperature Tn_out of the nth indoor unit through the heat exchanger inlet temperature sensor and heat exchanger outlet temperature sensor arranged on each indoor unit heat exchanger. The electronic equipment can then calculate the current temperature of the first heat exchanger. After determining the current mid-circuit temperature T1_mid of the second heat exchanger, the current mid-circuit temperature T2_mid of the second heat exchanger, ..., the current mid-circuit temperature Tn_mid of the nth heat exchanger, the average value of the current mid-circuit temperature of each indoor unit heat exchanger currently in operation is calculated, i.e., Tave_mid, where Tave_mid = (T1_mid + T2_mid + ... + Tn_mid) / n, thus obtaining the target evaporation temperature. Then, the first difference between the target evaporation temperature (i.e., Tave_mid) and the first saturation temperature Te is calculated, i.e., (Tave_mid - Te), thus obtaining the target parameters. Subsequently, the electronic device can determine whether the target parameter is greater than or equal to the first preset temperature T1. If yes, the electronic device executes branch one; if no, the electronic device executes branch two.

[0189] Branch 1: The electronic expansion valve control module starts a timer with a duration of P1_base (i.e., the target control cycle is P1_base) so that the electronic expansion valve control module controls the electronic expansion valve in the cycle of P1_base. When each cycle (i.e., P1_base) arrives, the exhaust temperature T_dis and intake pressure of the air conditioning system 400 in each cycle are collected through the exhaust temperature sensor 407 and the intake pressure sensor 409.

[0190] Branch 2: Determine whether the target parameter falls within the range of (second preset temperature T2, first preset temperature T1). If yes, the electronic device executes Branch 3; otherwise, the electronic device executes Branch 4.

[0191] Branch 3: The electronic expansion valve control module starts a timer with a duration of P2_base (i.e., the target control cycle is P2_base), so that the electronic expansion valve control module controls the electronic expansion valve in this cycle. At the arrival of each cycle (P2_base), the exhaust temperature T_dis and intake pressure of the air conditioning system 400 are collected by the exhaust temperature sensor 407 and intake pressure sensor 409 for each cycle. Where P1_base is greater than P2_base.

[0192] Branch 4: Determine whether the target parameter falls within the range of [third preset temperature T3, first preset temperature T2]. If yes, the electronic device executes Branch 5; otherwise, the electronic device executes Branch 6.

[0193] Branch 5: The electronic expansion valve control module starts a timer with a duration of P3_base (i.e., the target control cycle is P3_base), so that the electronic expansion valve control module controls the electronic expansion valve in this cycle. At the arrival of each cycle (P3_base), the exhaust temperature T_dis and intake pressure of the air conditioning system 400 are collected by the exhaust temperature sensor 407 and intake pressure sensor 409 for each cycle. P2_base is greater than P3_base.

[0194] Branch Six: The electronic expansion valve control module starts a timer with a duration of P4_base (i.e., the target control cycle is P4_base), so that the electronic expansion valve control module controls the electronic expansion valve in this cycle. At the arrival of each cycle (P4_base), the exhaust temperature T_dis and intake pressure of the air conditioning system 400 are collected by the exhaust temperature sensor 407 and intake pressure sensor 409 for each cycle. P3_base is greater than P4_base.

[0195] Subsequently, after acquiring the exhaust temperature T_dis and intake pressure for N consecutive target control cycles, or afterward, the saturation temperature corresponding to each intake pressure is calculated using pre-configured property software, thus obtaining the second saturation temperature Tc for N consecutive target control cycles. Here, N ranges from (3, 8). Subsequently, for each of these N target control cycles, the difference between the exhaust temperature T_dis and the second saturation temperature Tc in each cycle is calculated, thereby obtaining the exhaust superheat Tsh in each cycle, i.e., Tsh = Tdis - Tc, for a total of N exhaust superheat Tsh.

[0196] Then, for these N exhaust superheat values ​​Tsh, search for the maximum value Tsh_Max and the minimum value Tsh_Min among these N exhaust superheat values ​​Tsh, and calculate the difference between Tsh_Max and Tsh_Min, thereby obtaining the exhaust superheat fluctuation value. Tsh (also known as the second difference), Tsh = Tsh_Max - Tsh_Min.

[0197] Subsequently, the judgment Is Tsh greater than or equal to the first preset exhaust superheat threshold? Tsh_1. If yes, proceed to step one; otherwise, proceed to step two. The first preset exhaust superheat threshold is... The value range of Tsh_1 is [8℃, 15℃].

[0198] Step 1: Correct the target control period P_base using the first preset correction coefficient k1, so that the electronic expansion valve control module controls the electronic expansion valve with a period of P_base*k1 (i.e., the corrected control period). The target control period P_base is one of P1_base, P2_base, P3_base, and P4_base, determined by branches one through six above, and the value of k1 ranges from (1 to 1.5).

[0199] Step Two: Judgment Is Tsh greater than the second preset exhaust superheat threshold? Tsh_2, and simultaneously less than the first preset exhaust superheat threshold. Tsh_1. If yes, proceed to step three; otherwise, proceed to step four. The second preset exhaust superheat threshold is... The value range of Tsh_2 is [2℃, 5℃].

[0200] Step 3: Correct the target control cycle using the second preset correction coefficient k2, so that the electronic expansion valve control module controls the electronic expansion valve with a cycle of P_base*k2 (i.e., the corrected control cycle). Here, k1 is greater than k2, and the value range of k2 is (1.0, 1.2).

[0201] Step 4: Correct the target control cycle using the third preset correction coefficient k3, so that the electronic expansion valve control module controls the electronic expansion valve with a cycle of P_base*k3 (i.e., the corrected control cycle). Here, k2 is greater than k3, and the value of k3 ranges from (0.5, 1).

[0202] Finally, the opening of the electronic expansion valve is adjusted by the corrected target control cycle (i.e., the corrected control cycle). That is, every time the corrected control cycle is completed, the system parameter acquisition, opening calculation and valve adjustment are completed.

[0203] This application also provides an air conditioning system, which includes the above-described electronic device 300.

[0204] This application also provides a computer-readable storage medium storing a computer program that, when executed by one or more processors, implements the control method of the air conditioning system described above.

[0205] This application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the control method of the air conditioning system described above.

[0206] In this specification, the terms "specifically," "furthermore," "particularly," "understandably," etc., refer to specific features, structures, materials, or characteristics described in connection with embodiments or examples that are included in at least one embodiment or example of this application. 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.

[0207] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0208] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system includes an outdoor unit and at least one indoor unit, the outdoor unit and the at least one indoor unit are connected by pipes, the outdoor unit includes a compressor, and each indoor unit includes a heat exchanger and an electronic expansion valve connected to the heat exchanger. The method includes: Obtain the target operating parameters of the air conditioning system, wherein the target operating parameters include the current inlet plate temperature and the current outlet plate temperature of each target heat exchanger currently in operation, and the current suction pressure of the compressor; Based on the target operating parameters, determine the target parameters related to the pipeline length; Based on the target parameters, a target control cycle for the electronic expansion valve is determined, so that the electronic expansion valve is controlled according to the target control cycle.

2. The method according to claim 1, characterized in that, The electronic expansion valve is used to control the flow state of the refrigerant in the pipeline. Determining the target parameters related to the pipeline length based on the target operating parameters includes: The target evaporation temperature of the refrigerant is determined based on the current inlet temperature and the current outlet temperature of each target heat exchanger. Based on the current inhalation pressure, determine the first saturation temperature corresponding to the current inhalation pressure; The first difference between the target evaporation temperature and the first saturation temperature is determined as the target parameter, wherein the first difference is related to the pipeline length.

3. The method according to claim 2, characterized in that, Determining the target evaporation temperature of the refrigerant based on the current inlet temperature and the current outlet temperature of each target heat exchanger includes: The average value of the current inlet plate temperature and the current outlet plate temperature of the target heat exchanger is determined as the current middle plate temperature of the target heat exchanger; The average value of the current center plate temperature of each of the target heat exchangers is determined as the target evaporation temperature.

4. The method according to claim 2, characterized in that, The step of determining the target control cycle of the electronic expansion valve based on the target parameters, and controlling the electronic expansion valve according to the target control cycle, includes: If the target parameter is greater than or equal to the first preset temperature value, the first preset period is determined as the target control period; When the target parameter is greater than the second preset temperature value and less than the first preset temperature value, the second preset period is determined as the target control period, wherein the first preset period is greater than the second preset period; When the target parameter is greater than the third preset temperature value and less than or equal to the second preset temperature value, the third preset period is determined as the target control period, wherein the second preset period is greater than the third preset period; If the target parameter is less than or equal to the third preset temperature value, the fourth preset period is determined as the target control period, wherein the third preset period is greater than the fourth preset period.

5. The method according to any one of claims 1-4, characterized in that, The method further includes: When the electronic expansion valve is controlled according to the target control cycle, the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle are obtained; Based on the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle, the target control cycle is corrected to obtain a corrected control cycle, and the electronic expansion valve is controlled according to the corrected control cycle.

6. The method according to claim 5, characterized in that, The step of correcting the target control cycle based on the exhaust pressure and exhaust temperature of the air conditioning system under the target control cycle to obtain a corrected control cycle, and controlling the electronic expansion valve according to the corrected control cycle, includes: Based on the exhaust pressure of the air conditioning system under the target control cycle, determine the second saturation temperature of the air conditioning system under the target control cycle; The difference between the exhaust temperature and the second saturation temperature of the air conditioning system under the target control cycle is determined as the exhaust superheat of the air conditioning system under the target control cycle. Based on the exhaust superheat of the air conditioning system under the target control cycle, the target control cycle is corrected to obtain the corrected control cycle, and the electronic expansion valve is controlled according to the corrected control cycle.

7. The method according to claim 6, characterized in that, The step of correcting the target control cycle based on the exhaust superheat of the air conditioning system under the target control cycle to obtain the corrected control cycle, and controlling the electronic expansion valve according to the corrected control cycle, includes: Based on the exhaust superheat of the air conditioning system in multiple consecutive target control cycles, determine the maximum and minimum exhaust superheat in multiple consecutive target control cycles; The period correction coefficient is determined based on the second difference between the maximum exhaust superheat and the minimum exhaust superheat. The target control cycle is corrected according to the cycle correction coefficient to obtain the corrected control cycle, and the electronic expansion valve is controlled according to the corrected control cycle.

8. The method according to claim 7, characterized in that, The determination of the periodic correction coefficient based on the second difference between the maximum exhaust superheat and the minimum exhaust superheat includes: If the second difference is greater than or equal to the first preset exhaust superheat threshold, the first preset coefficient is determined as the period correction coefficient. When the second difference is greater than the second preset exhaust superheat threshold and less than the first preset exhaust superheat threshold, the second preset coefficient is determined as the periodic correction coefficient, wherein the first preset coefficient is greater than the second preset coefficient. If the second difference is less than or equal to the second preset exhaust superheat threshold, the third preset coefficient is determined as the period correction coefficient, wherein the second preset coefficient is greater than the third preset coefficient.

9. The method according to claim 7, characterized in that, The step of correcting the target control period according to the period correction coefficient to obtain the corrected control period, and controlling the electronic expansion valve according to the corrected control period, includes: The product of the period correction coefficient and the target control period is determined as the correction control period, so as to control the electronic expansion valve according to the correction control period.

10. An electronic device, characterized in that, The electronic device includes a processor and a memory, the memory storing a computer program, and the processor executes the control method of the air conditioning system according to any one of claims 1-9 by calling the computer program stored in the memory.

11. An air conditioning system, characterized in that, The air conditioning system includes the electronic device as described in claim 10.

12. A computer program product comprising computer instructions, characterized in that, When the computer instructions are executed by the processor, they implement the control method of the air conditioning system according to any one of claims 1-9.

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