Air conditioning system, control method and device thereof, electronic equipment and readable storage medium

Abstract

The invention relates to an air conditioning system, a control method and device thereof, electronic equipment and a readable storage medium. The method comprises the steps that the operation capacity change trend of the indoor unit at different target superheat degrees or different target supercooling degrees is determined, and the optimal target superheat degree or the optimal target supercooling degree of the indoor unit is determined according to the operation capacity change trend; and the opening degree of an electronic expansion valve of the indoor unit is adjusted according to the optimal target superheat degree or the optimal target supercooling degree, so that the current operation capacity of the indoor unit is adjusted. And the current operation capacity of the indoor unit is detected, and the operation frequency of a compressor is adjusted according to the deviation between the target operation capacity of the indoor unit and the current operation capacity. The problems that according to an existing air conditioning system, the opening degree of an electronic expansion valve of an indoor unit is adjusted through the same target superheat degree or target supercooling degree under different conditions, it is difficult to achieve maximization of the heat exchange capacity of a heat exchanger of the indoor unit, and the whole machine operation energy efficiency level is low are solved.

Description

Technical Field

[0001] This application relates to the technical field of air conditioner control, and in particular, to an air conditioning system, a control method, a device, an electronic device, and a readable storage medium thereof. Background Art

[0002] In an air conditioning system, the opening degree of the electronic expansion valve of the indoor unit is a key control component affecting the heat exchange efficiency of the indoor unit. Its opening degree not only affects the refrigerant flow rate through the indoor heat exchanger, but also affects the refrigerant temperature and the heat exchange temperature difference through the throttling effect, and ultimately affects the heat exchange effect. In a traditional multi-indoor-unit air conditioning system, the electronic expansion valves of all indoor units are mainly controlled uniformly, such as setting the same target superheat or target subcooling degree. During actual engineering installation, the refrigerant flowing out of the outdoor unit has the same state before being distributed to different indoor units. However, due to factors such as the installation location and the length of the connecting pipe of the indoor unit, the states of the refrigerant entering different indoor units show individual differences. If the indoor unit still adjusts the opening degree of the electronic expansion valve according to the unified control method, it is impossible to make each indoor unit achieve the best heat exchange effect. That is, in the air conditioning system in the prior art, regardless of the indoor units turned on in any scenario, the same target superheat or target subcooling degree is used to adjust the opening degree of the electronic expansion valve of the indoor unit, making it difficult to maximize the heat exchange capacity of the heat exchanger of the indoor unit, resulting in a reduction in the overall operating energy efficiency level.

[0003] In view of the above problems, no effective solution has been proposed yet. Summary of the Invention < /

[0004] This application provides an air conditioning system, a control method, a device, an electronic device, and a readable storage medium thereof to solve the above technical problem of "it is difficult for an air conditioning system to maximize the heat exchange capacity of the heat exchanger of an indoor unit, resulting in a reduction in the overall operating energy efficiency level".

[0005] According to one aspect of the embodiments of this application, a control method for an air conditioning system is provided, including: determining the change trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, and determining the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the change trend of the operating capacity; adjusting the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree to adjust the current operating capacity of the indoor unit; detecting the current operating capacity of the indoor unit, and adjusting the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit.

[0006] Optionally, determining the change trend of the operating capacity of the indoor unit when determining different target superheat degrees or different target subcooling degrees, and determining the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the change trend of the operating capacity, includes: determining the total capacity demand of all the turned-on indoor units of the air-conditioning system according to the ambient temperature of the room where the indoor unit is located, the set temperature of the indoor unit, and the capacity of the indoor unit; calculating the initial operating frequency of the compressor according to the total capacity demand, and controlling the compressor to operate at the initial operating frequency; controlling the opening degree of the electronic expansion valve according to the initial target superheat degree or the initial target subcooling degree of the indoor unit, and adjusting the target superheat degree or the target subcooling degree based on a preset increase amplitude until a predetermined number of adjustment rounds are reached to obtain the optimal target superheat degree or the optimal target subcooling degree.

[0007] Optionally, controlling the opening degree of the electronic expansion valve according to the initial target superheat degree or the initial target subcooling degree of the indoor unit, and adjusting the target superheat degree or the target subcooling degree based on a preset increase amplitude until a predetermined number of adjustment rounds are reached to obtain the optimal target superheat degree or the optimal target subcooling degree, includes: controlling the opening degree of the electronic expansion valve of the indoor unit based on the initial target superheat degree when the indoor unit is in the cooling mode, and controlling the opening degree of the electronic expansion valve of the indoor unit based on the initial target subcooling degree when the indoor unit is in the heating mode; after the indoor unit operates for a first preset duration, if the indoor unit is in the cooling mode, obtaining the target superheat degree of the next round based on the current target superheat degree and a first preset increase amplitude, and if the indoor unit is in the heating mode, obtaining the target subcooling degree of the next round based on the current target subcooling degree and a second preset increase amplitude; controlling the indoor unit to operate for a second preset duration based on the target superheat degree or the target subcooling degree of the next round and obtaining the operating capacity of the indoor unit; after the indoor unit operates for the second preset duration, adjusting the target superheat degree based on the first preset increase amplitude or adjusting the target subcooling degree based on the second preset increase amplitude, until the operating capacity of the indoor unit corresponding to the target superheat degree or the target subcooling degree of the nth round is not less than the operating capacity of the indoor unit of the (n - 1)th round and greater than the operating capacity of the indoor unit of the (n + 1)th round, then stop adjusting the target superheat degree or the target subcooling degree; where n≥1, n represents the number of indoor units in the air-conditioning system; setting the optimal target superheat degree or the optimal subcooling degree as the value adjusted in the nth round.

[0008] Optionally, before determining the variation trend of the operating capacity of the indoor unit when determining different target superheat degrees or different target subcooling degrees, the following steps are further included: detecting whether the air conditioning system has a memory function; if so, proceeding to the next step; if not, using the initial value given by the controller as the initial target superheat degree or the initial target subcooling degree for this round of operation; detecting whether there is an optimal target superheat degree or an optimal target subcooling degree that meets the similar scenarios set based on the operating conditions of the air conditioning system in the indoor unit; if there is, using the optimal target superheat degree or the optimal target subcooling degree as the initial target superheat degree or the initial target subcooling degree for this round of operation; if not, using the initial value given by the controller as the initial target superheat degree or the initial target subcooling degree for this round of operation.

[0009] Optionally, adjusting the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree includes: when the air conditioning system is in the cooling mode, detecting the magnitude relationship between the current superheat degree of the indoor unit and the target superheat degree; wherein, the current superheat degree is the difference between the temperature of the refrigerant after evaporation through the indoor heat exchanger and the saturation temperature corresponding to the refrigerant pressure; if the current superheat degree is less than the target superheat degree, reducing the opening degree of the electronic expansion valve of the indoor unit; if the current superheat degree is equal to the target superheat degree, maintaining the opening degree of the electronic expansion valve of the indoor unit unchanged; if the current superheat degree is greater than the target superheat degree, increasing the opening degree of the electronic expansion valve of the indoor unit; and / or, when the air conditioning system is in the heating mode, detecting the magnitude relationship between the current subcooling degree of the indoor unit and the target subcooling degree; wherein, the current subcooling degree is the difference between the saturation temperature corresponding to the refrigerant pressure after condensation through the indoor heat exchanger and the refrigerant temperature; if the current subcooling degree is less than the target subcooling degree, reducing the opening degree of the electronic expansion valve of the indoor unit; if the current subcooling degree is equal to the target subcooling degree, maintaining the opening degree of the electronic expansion valve of the indoor unit unchanged; if the current subcooling degree is greater than the target subcooling degree, increasing the opening degree of the electronic expansion valve of the indoor unit.

[0010] Optionally, the number of adjustment rounds of the target superheat degree or the target subcooling degree is at least the preset number of rounds. If the (n - 1)-th round of adjustment is the first startup operation of the air conditioning system, and the operating capacity of the indoor unit in the (n - 1)-th round is not less than that in the n-th round and greater than that in the (n + 1)-th round, then the optimal target superheat degree of the indoor unit is set to the current superheat degree at the first startup operation or the optimal target subcooling degree is set to the current subcooling degree at the first startup operation; wherein, n ≥ 1, and n represents the number of indoor units in the air conditioning system.

[0011] Optionally, adjusting the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit includes: obtaining the current operating capacity and the target operating capacity of the indoor unit; determining the number of indoor units with the current operating capacity greater than the target operating capacity as the first number of indoor units; calculating the proportion of the first number of indoor units to the total number of all turned-on indoor units in the air-conditioning system as the first proportion; and determining the operating frequency of the compressor according to the relationship between the first proportion and a preset range of proportions.

[0012] Optionally, determining the operating frequency of the compressor according to the relationship between the first proportion and a preset range of proportions includes: judging the size relationship between the first proportion and the preset range of proportions; if the first proportion is greater than or equal to the maximum value of the preset range of proportions, reducing the operating frequency of the compressor to a first operating frequency; if the first proportion is less than or equal to the minimum value of the preset range of proportions, increasing the operating frequency of the compressor to a second operating frequency; and if the first proportion is within the preset range of proportions, maintaining the current operating frequency of the compressor unchanged.

[0013] According to another aspect of the present application, the present application provides an air-conditioning system, which is the above-mentioned air-conditioning system and includes: an outdoor unit section, the outdoor unit section includes a gas-liquid separator, a compressor, a four-way valve, an outdoor heat exchanger and an outdoor electronic expansion valve. The outlet of the gas-liquid separator is connected to the suction side of the compressor, the discharge side of the compressor is connected to the first port of the four-way valve, the second port of the four-way valve is connected to one end of the outdoor heat exchanger, and the other end of the outdoor heat exchanger is connected to the outdoor electronic expansion valve; an indoor unit section, the indoor unit section includes n indoor units, the indoor unit includes an indoor heat exchanger and an indoor electronic expansion valve connected to the indoor heat exchanger. The indoor electronic expansion valve is connected to the pipeline where the outdoor electronic expansion valve is located. The indoor heat exchanger is connected to the third port of the four-way valve through a pipeline, and the fourth port of the four-way valve is connected to the inlet of the gas-liquid separator; where n≥1, and n represents the number of indoor units in the air-conditioning system.

[0014] According to another aspect of the present application, the present application provides a control device for an air-conditioning system, including: an optimal parameter determination module, configured to determine the change trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, and determine the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the change trend of the operating capacity; an electronic expansion valve adjustment module, configured to adjust the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree, so as to adjust the current operating capacity of the indoor unit; a compressor adjustment module, configured to detect the current operating capacity of the indoor unit and adjust the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit.

[0015] According to another aspect of the embodiments of the present application, the present application provides an electronic device, including a memory, a processor, a communication interface, and a communication bus. A computer program that can run on the processor is stored in the memory. The memory and the processor communicate through the communication bus and the communication interface. When the processor executes the computer program, the steps of the method for the air-conditioning system described above are implemented.

[0016] According to another aspect of the embodiments of the present application, the present application further provides a readable storage medium storing program instructions. When the program instructions are read and executed by a computing device, the computing device is caused to execute the control method for the air-conditioning system described above.

[0017] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the related technologies:

[0018] This application takes a single indoor unit as the control unit, optimizes the target superheat or target subcooling degree of the indoor unit based on the operating capacity of the indoor unit, realizes finding the optimal target superheat or optimal target subcooling degree of the indoor unit with the optimal capacity as the guide, and then controls the opening degree of the electronic expansion valve of the indoor unit. Under the initial compressor output condition that meets the capacity demand of the indoor unit, the opening degree of the electronic expansion valve of the indoor unit is adjusted to obtain the optimal capacity, and then the output of the compressor is adjusted through the supply-demand relationship between the optimal capacity and the room capacity demand, which can achieve the effect of energy conservation and consumption reduction. By determining the change trend of the operating capacity of the indoor unit at different target superheat or subcooling degrees to find the optimal target superheat or optimal target subcooling degree, the individual differences between the refrigerant states of different indoor units in different scenarios are considered. It can determine the appropriate target superheat or target subcooling degree for each indoor unit, so as to accurately adjust the opening degree of the electronic expansion valve, make the refrigerant flow rate, temperature and heat transfer temperature difference reach the best match, give full play to the heat transfer capacity of each indoor unit, and realize the maximization of the heat transfer capacity of the heat exchanger. According to the deviation between the target operating capacity and the current operating capacity of the indoor unit, the operating frequency of the compressor is adjusted, which can accurately match the output of the compressor with the actual demand of the indoor unit, not only ensure that the capacity of the indoor unit meets the demand of the corresponding room, but also reduce the power consumption of the air conditioning system, achieving the effect of energy conservation and comfort. It avoids the energy waste caused by the high-frequency operation of the compressor when the demand of the indoor unit is low, or the situation that the indoor unit cannot work effectively due to insufficient frequency when the demand is high, and further improves the overall operating energy efficiency level of the whole machine. Adjusting for each indoor unit enables the air conditioning system to better adapt to various scenarios. By reasonably adjusting the operating frequency of the compressor, the overall operation stability of the air conditioning system is maintained, and the system fluctuations caused by the improper matching between the indoor unit and the compressor are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of this application or the related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or the related technologies. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0021] Figure 1 FIG. is a schematic structural diagram of an air conditioning system provided according to an embodiment of this application;

[0022] Figure 2 FIG. is a schematic flowchart of a control method for an air conditioning system provided according to an embodiment of this application;

[0023] Figure 3Schematic diagram of the detailed process of a control method for an air conditioning system provided according to an embodiment of the present application;

[0024] Figure 4 Schematic diagram of the process of another implementation manner of a control method for an air conditioning system provided according to an embodiment of the present application;

[0025] Figure 5 Schematic diagram of the structure of a control device for an air conditioning system provided according to an embodiment of the present application;

[0026] Figure 6 Schematic diagram of an optional electronic device structure provided according to an embodiment of the present application. Detailed implementation manner

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0028] In subsequent descriptions, suffixes such as "module", "component", or "unit" used to represent elements are only for the convenience of description of the present application, and they have no specific meaning themselves. Therefore, "module" and "component" can be used interchangeably.

[0029] In the related art, indoor units in the on state of the air conditioning system in different scenarios all use the same target superheat or target subcooling to adjust the opening degree of the electronic expansion valve of the indoor unit, which is difficult to maximize the heat exchange capacity of the heat exchanger of the indoor unit, and the overall operating energy efficiency level is low.

[0030] To solve the problems mentioned in the background art, on the one hand, an embodiment of an air conditioning system is provided according to an embodiment of the present application, as Figure 1As shown in the figure, the air-conditioning system includes an outdoor unit section and an indoor unit section. Among them, the outdoor unit section includes a gas-liquid separator 101, a compressor 102, a four-way valve 103, an outdoor heat exchanger 104, and an outdoor electronic expansion valve 105. The outlet of the gas-liquid separator is connected to the suction side of the compressor. The discharge side of the compressor is connected to the first port of the four-way valve. The second port of the four-way valve is connected to one end of the outdoor heat exchanger. The other end of the outdoor heat exchanger is connected to the outdoor electronic expansion valve. The indoor unit section includes n indoor units 106. The indoor unit includes an indoor heat exchanger 107 and an indoor electronic expansion valve 108 connected to the indoor heat exchanger. The indoor electronic expansion valve is connected to the pipeline where the outdoor electronic expansion valve is located. The indoor heat exchanger is connected to the third port of the four-way valve through a pipeline. The fourth port of the four-way valve is connected to the inlet of the gas-liquid separator to form a refrigerant circulation flow path.

[0031] According to another aspect of the embodiments of the present application, an embodiment of a control method for an air-conditioning system is provided. The control method is used to control the above control system, such as Figure 2 And Figure 3 As shown in the figure, it includes:

[0032] S201, determine the change trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, and determine the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the change trend of the operating capacity.

[0033] Optionally, before determining the change trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, it further includes:

[0034] Detect whether the air-conditioning system has a memory function; if so, execute the next step; if not, use the initial value given by the controller as the initial target superheat degree or the initial target subcooling degree for this round of operation; detect whether there is an optimal target superheat degree that meets the set similar scenarios based on the operating conditions of the air-conditioning system for the indoor unit; if it exists, use the optimal target superheat degree or the optimal target subcooling degree as the initial target superheat degree for this round of operation; if it does not exist, use the initial value given by the controller as the initial target superheat degree for this round of operation.

[0035] Synchronously, it is detected whether the air conditioning system has a memory function; if so, the next step is executed; if not, the initial value assigned by the controller is used as the initial target superheat degree for this round of operation; it is detected whether there is an optimal target superheat degree in the indoor unit that meets the similar scenarios set based on the operating conditions of the air conditioning system; if there is, the optimal target superheat degree is used as the initial target superheat degree for this round of operation; if not, the initial value assigned by the controller is used as the initial target superheat degree for this round of operation. In the above implementation, when the air conditioning system has a memory function and it is detected that there is a similar scenario in the indoor unit that meets the operating conditions of the air conditioning system, the optimal target superheat degree or the optimal target subcooling degree in the memory is directly used as the initial value for this round of operation, and the air conditioning system can quickly operate in the optimal state. For example, reusing the optimal target superheat degree or the optimal target subcooling degree when the operating conditions of the air conditioning system are met can avoid unnecessary energy consumption, reduce the frequent start-stop and inefficient operation of the compressor during the parameter adjustment process, and thus significantly reduce energy consumption. Each time the air conditioning system is started, if it is necessary to gradually adjust the target superheat degree or subcooling degree from the initial state to find the optimal value, it will consume a lot of time and energy. By using the memory function and similar scenario judgment, the initial parameters can be quickly determined, and the air conditioning system can enter a stable and efficient operating state faster. By detecting similar scenarios and using the corresponding optimal target superheat degree or optimal target subcooling degree, the air conditioning system can quickly adapt to different operating conditions. Under different seasons and different indoor and outdoor environmental conditions, the cooling or heating requirements faced by the air conditioner are different. When encountering a working condition similar to the previous one, directly using the optimal target superheat degree or the optimal target subcooling degree in the memory can make the indoor unit reach the ideal operating state faster, improve the speed and effect of cooling or heating, and enhance the comfort of users. Using the optimal target superheat degree or the optimal target subcooling degree as the initial value helps the air conditioning system to maintain a relatively stable state in the initial stage of operation.

[0036] Specifically, before determining the change trend of the operating capacity of the indoor unit, it is first detected whether the air conditioning system is preset with a memory function for judging the optimal target superheat or the optimal target subcooling based on a similar scenario. When it is detected that the air conditioning system does not have a memory function, the initial value given by the controller is used as the initial target superheat or the initial target subcooling for this round of operation. When it is detected that the air conditioning system has a memory function, it is further detected whether the indoor unit has an optimal target superheat or an optimal target subcooling for a similar scenario. A similar scenario is a judgment mechanism preset by the air conditioning system based on functions for judging the optimal target superheat or the optimal target subcooling to determine whether the current operating scenario of the indoor unit is similar to the similar scenario. The similar scenario is set in the air conditioning system in advance through the operating conditions of the air conditioning system. The operating conditions of the air conditioning system include, but are not limited to, the outdoor ambient temperature, the capacity of the indoor unit that is turned on, and the operating frequency of the compressor. When all the above operating conditions are consistent with the preset operating conditions or within a given deviation threshold range, there is an optimal target superheat or an optimal target subcooling. For example, when the differences between the detected outdoor ambient temperature, the indoor unit capacity, and the compressor operating frequency and the outdoor ambient temperature, the turned-on indoor unit capacity, and the compressor operating frequency when the optimal target superheat or the optimal target subcooling is memorized are ΔT, ΔQ, and Δf respectively, and |ΔT| ≤ 2°C, |ΔQ| ≤ 2 kW, and |Δf| ≤ 5 Hz are satisfied simultaneously, it is regarded as a similar scenario; otherwise, it is regarded as a different scenario (i.e., not similar).

[0037] Optionally, to determine the change trend of the operating capacity of the indoor unit when different target superheats or different target subcoolings are determined, and determine the optimal target superheat or the optimal target subcooling of the indoor unit according to the change trend of the operating capacity, including:

[0038] Determine the total capacity requirement of all the indoor units that are turned on in the air conditioning system according to the ambient temperature of the room where the indoor unit is located, the set temperature of the indoor unit, and the capacity of the indoor unit;

[0039] Calculate the initial operating frequency of the compressor according to the total capacity requirement, and control the compressor to operate at the initial operating frequency;

[0040] Control the opening of the electronic expansion valve according to the initial target superheat or the initial target subcooling of the indoor unit, and adjust the target superheat or the target subcooling based on a preset increase until a predetermined number of adjustment rounds are reached to obtain the optimal target superheat or the optimal target subcooling.

[0041] In the above embodiments, the total capacity requirement of all the indoor units that are turned on in the air-conditioning system is determined based on the ambient temperature of the room where the indoor unit is located, the set temperature of the indoor unit, and the capacity of the indoor unit, which can accurately reflect the actual cooling or heating requirement. The ambient temperatures of different rooms are different, the temperatures set by users also vary, and at the same time, the capacity of the indoor unit will also affect the cooling or heating effect. By comprehensively using the ambient temperature, set temperature, and the capacity of the indoor unit to determine the total capacity requirement, the air-conditioning system can be adjusted according to the actual requirement, avoiding the situation of insufficient or excessive capacity. Calculating the initial operating frequency of the compressor based on the total capacity requirement and controlling the compressor to operate at the initial operating frequency can ensure that the output of the compressor matches the overall requirement of the indoor unit. Controlling the opening degree of the electronic expansion valve according to the initial target superheat degree or initial target subcooling degree of the indoor unit can enable the refrigerant to achieve relatively ideal evaporation or condensation in the indoor heat exchanger, ensuring the normal operation of the indoor unit. Adjusting the target superheat degree or target subcooling degree based on a preset increase until a predetermined number of adjustment cycles are reached to obtain the optimal target superheat degree or optimal target subcooling degree can improve the operating efficiency of the indoor unit, enabling the indoor unit to be in the best working state under different working conditions, improving the cooling or heating effect of the indoor unit, and thus enhancing the comfort of the user.

[0042] Specifically, obtain the ambient temperature of the room where the indoor unit that is turned on in the air-conditioning system is located, the set temperature of the indoor unit, and the capacity of the indoor unit. Determine the total capacity requirement ΣQi of all the indoor units that are turned on in the air-conditioning system based on the obtained ambient temperature, set temperature, and capacity of the indoor unit. Calculate the initial operating frequency f0 of the compressor according to ΣQi, and control the compressor to maintain operation at the initial operating frequency f0. Each turned-on indoor unit controls the opening degree of the indoor unit's electronic expansion valve according to the initial target superheat degree in the cooling mode or according to the initial target subcooling degree in the heating mode. After adjusting the opening degree of the electronic expansion valve and the indoor unit has operated for a predetermined time, adjust the target superheat degree or target subcooling degree of the compressor with a preset increase set in advance to a predetermined adjustment time to obtain the optimal target superheat degree or optimal target subcooling degree.

[0043] Optionally, controlling the opening degree of the electronic expansion valve according to the initial target superheat degree or initial target subcooling degree of the indoor unit and adjusting the target superheat degree or target subcooling degree based on a preset increase until a predetermined number of adjustment cycles are reached to obtain the optimal target superheat degree or optimal target subcooling degree includes:

[0044] When the indoor unit is in the cooling mode, control the opening degree of the indoor unit's electronic expansion valve based on the initial target superheat degree. When the indoor unit is in the heating mode, control the opening degree of the indoor unit's electronic expansion valve based on the initial target subcooling degree;

[0045] After the indoor unit operates for the first preset duration, if the indoor unit is in the cooling mode, the target superheat for the next round is obtained based on the current target superheat and the first preset increase; if the indoor unit is in the heating mode, the target subcooling for the next round is obtained based on the current target subcooling and the second preset increase.

[0046] Based on the target superheat or target subcooling for the next round, control the indoor unit to operate for the second preset duration and obtain the operating capacity of the indoor unit.

[0047] After the indoor unit operates for the second preset duration, adjust the target superheat based on the first preset increase or adjust the target subcooling based on the second preset increase until the operating capacity of the indoor unit corresponding to the target superheat or target subcooling in the nth round is not less than that in the (n - 1)th round and greater than that in the (n + 1)th round, then stop adjusting the target superheat or target subcooling; where n ≥ 1 and n represents the number of indoor units in the air-conditioning system.

[0048] Set the optimal target superheat or optimal subcooling as the value adjusted in the nth round.

[0049] In the above implementation, controlling the opening of the electronic expansion valve based on the initial target superheat in the cooling mode and based on the initial target subcooling in the heating mode can enable the air-conditioning system to work with a suitable refrigerant flow rate and state in different operating modes. For example, during cooling, an appropriate superheat can ensure that the refrigerant in the evaporator evaporates fully, absorbs more heat, and improves the cooling efficiency; during heating, an appropriate subcooling can make the refrigerant in the condenser condense fully, release more heat, and enhance the heating effect. By gradually adjusting the target superheat or subcooling until the optimal target superheat or optimal target subcooling that makes the operating capacity of the indoor unit reach the best is found. Taking cooling as an example, continuously adjusting the superheat makes the evaporation process of the refrigerant in the evaporator closer to the ideal state, thereby enhancing the cooling capacity of the indoor unit and enabling the room to reach and maintain the set temperature faster. Based on the number of indoor units, a clear adjustment stop condition is set, that is, when the operating capacity of the indoor unit corresponding to the target superheat or target subcooling adjusted in the nth round is not less than that in the (n - 1)th round and greater than that in the (n + 1)th round, stop adjusting, which avoids unnecessary over-adjustment and reduces energy waste during the process of finding the optimal parameters.

[0050] Specifically, when the indoor unit is in the cooling mode, the opening degree of the electronic expansion valve of the indoor unit is controlled based on the initial target superheat degree. After the opening degree of the electronic expansion valve of the indoor unit is adjusted, if the indoor unit operates in the cooling mode for the first preset duration t1, then a first preset amplitude δ (the first preset amplitude is set according to historical experience) is added to the current target superheat degree Tnh to obtain the target superheat degree of the indoor unit in the next round as Tmc = Tnc + δ. After the target superheat degree of the indoor unit increases, the indoor unit continues to operate for the second preset duration t2, and the operating capacity of the indoor unit at this time is obtained. After the indoor unit operates for the second preset duration, the target superheat degree is adjusted continuously according to the first preset amplitude δ until the operating capacity of the indoor unit when the target superheat degree is adjusted for the nth time is greater than or equal to the operating capacity of the indoor unit when the target superheat degree was adjusted for the (n - 1)th time and greater than the operating capacity of the indoor unit when the target superheat degree was adjusted for the (n + 1)th time. The optimal target superheat degree of the indoor unit is the value at the nth adjustment. When the indoor unit is in the heating mode, the opening degree of the electronic expansion valve of the indoor unit is controlled based on the initial target subcooling degree. After the opening degree of the electronic expansion valve of the indoor unit is adjusted, if the indoor unit operates in the heating mode for the second preset duration t1, a second preset amplitude ε (the second preset amplitude is set according to historical experience) is added to the current target subcooling degree Tmh to obtain the target subcooling degree of the indoor unit in the next round as Tmh = Tnh + ε. After the target subcooling degree of the indoor unit increases, the indoor unit continues to operate for the second preset duration t2, and the operating capacity of the indoor unit at this time is obtained. After the indoor unit operates for the second preset duration, the target subcooling degree is adjusted continuously according to the second preset amplitude ε until the operating capacity of the indoor unit when the target subcooling degree is adjusted for the nth time is greater than or equal to the operating capacity of the indoor unit when the target subcooling degree was adjusted for the (n - 1)th time and greater than the operating capacity of the indoor unit when the target subcooling degree was adjusted for the (n + 1)th time. The optimal target subcooling degree of the indoor unit is the value at the nth adjustment.

[0051] S203, adjust the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree;

[0052] Optionally, adjusting the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree includes:

[0053] When the air-conditioning system is in the cooling mode, detect the magnitude relationship between the current superheat degree and the target superheat degree of the indoor unit; wherein, the current superheat degree is the difference between the temperature of the refrigerant after evaporation flowing through the indoor heat exchanger and the saturation temperature corresponding to the refrigerant pressure; if the current superheat degree is less than the target superheat degree, then reduce the opening degree of the electronic expansion valve of the indoor unit; if the current superheat degree is equal to the target superheat degree, then keep the opening degree of the electronic expansion valve of the indoor unit unchanged; if the current superheat degree is greater than the target superheat degree, then increase the opening degree of the electronic expansion valve of the indoor unit;

[0054] When the air - conditioning system is in the heating mode, detect the relationship between the current sub - cooling degree and the target sub - cooling degree of the indoor unit; where the current sub - cooling degree is the difference between the saturation temperature corresponding to the refrigerant pressure after condensation by the indoor heat exchanger and the refrigerant temperature; if the current sub - cooling degree is less than the target sub - cooling degree, reduce the opening degree of the electronic expansion valve of the indoor unit; if the current sub - cooling degree is equal to the target sub - cooling degree, keep the opening degree of the electronic expansion valve of the indoor unit unchanged; if the current sub - cooling degree is greater than the target sub - cooling degree, increase the opening degree of the electronic expansion valve of the indoor unit.

[0055] In the above - mentioned embodiment, in the cooling mode, the opening degree of the electronic expansion valve is adjusted by detecting the relationship between the current superheat degree and the target superheat degree. When the current superheat degree is less than the target superheat degree, the opening degree of the electronic expansion valve is reduced, and the refrigerant flow rate is decreased, so that the refrigerant has more sufficient time to evaporate in the indoor heat exchanger, thereby improving the cooling effect. For example, if the refrigerant flow rate is too large, part of the refrigerant may leave the evaporator before it is completely evaporated, resulting in a reduction in the cooling efficiency; by adjusting the opening degree of the electronic expansion valve, this situation can be avoided. When the current superheat degree is greater than the target superheat degree, the opening degree of the electronic expansion valve is increased, and the refrigerant flow rate is increased to ensure that there is enough refrigerant participating in the evaporation process and maintain the cooling capacity. In the heating mode, the relationship between the current sub - cooling degree and the target sub - cooling degree is detected for adjustment. When the current sub - cooling degree is less than the target sub - cooling degree, the opening degree of the electronic expansion valve is reduced, so that the refrigerant condenses more fully in the indoor heat exchanger, releases more heat, and improves the heating effect. When the current sub - cooling degree is greater than the target sub - cooling degree, the opening degree of the electronic expansion valve is increased to ensure that there is enough refrigerant for condensation and guarantee the heating efficiency. Through real - time monitoring and adjustment, the current superheat degree or sub - cooling degree is made to approach the target value as much as possible, thereby stabilizing the circulation state of the refrigerant. It avoids problems such as pressure fluctuations and temperature fluctuations caused by unstable refrigerant flow rates, reduces abnormal conditions during the operation of the air - conditioning system, such as frequent start - stop of the compressor, etc., and enhances the stability of the entire air - conditioning system.

[0056] Specifically, when the air conditioning system is in the cooling mode, the refrigerant pressure is detected by a pressure sensor built into the indoor unit, and the refrigerant temperature is detected by a temperature sensor built into the indoor unit. The current superheat degree of the indoor unit is calculated based on the detected refrigerant pressure and refrigerant temperature. The current superheat degree is the difference between the temperature of the refrigerant after evaporation flowing through the indoor heat exchanger and the saturation temperature corresponding to the refrigerant pressure. The saturation temperature represents the temperature at which the refrigerant is in a coexistence state of liquid and gas under a specific pressure. The difference between the calculated current superheat degree and the target superheat degree is obtained. When the difference between the calculated current superheat degree and the target superheat degree is less than 0 (i.e., the current superheat degree < the target superheat degree), the smaller current superheat degree indicates that there is too much liquid refrigerant in the evaporator. The opening degree of the electronic expansion valve of the indoor unit is controlled to decrease, so that the refrigerant flow rate decreases, and the refrigerant can have more sufficient time to evaporate in the evaporator, thereby increasing the current superheat degree. When the difference between the calculated current superheat degree and the target superheat degree is equal to 0 (i.e., the current superheat degree = the target superheat degree), it means that the refrigeration operation state of the air conditioning system is in an ideal state at this time, and the evaporation degree of the refrigerant in the evaporator is just right. Therefore, the opening degree of the electronic expansion valve of the indoor unit is controlled to remain unchanged to ensure that the current superheat degree remains unchanged. When the difference between the calculated current superheat degree and the target superheat degree is greater than 0 (i.e., the current superheat degree > the target superheat degree), at this time, the refrigerant in the evaporator evaporates too fully, and there may be a shortage of refrigerant, which will lead to a decrease in the refrigeration effect. The opening degree of the electronic expansion valve of the indoor unit is controlled to increase to increase the refrigerant flow rate, so that there is enough refrigerant in the evaporator for evaporation and heat absorption, thereby improving the refrigeration capacity.

[0057] Further, when the air-conditioning system is in the heating mode, the refrigerant pressure is detected by a pressure sensor built in the indoor unit, and the refrigerant temperature is detected by a temperature sensor built in the indoor unit. The current subcooling degree of the indoor unit is calculated based on the detected refrigerant pressure and refrigerant temperature. The current subcooling degree is the difference between the saturation temperature corresponding to the refrigerant pressure after condensation flowing through the indoor heat exchanger and the refrigerant temperature. The difference between the calculated current subcooling degree and the target subcooling degree, when the difference between the calculated current subcooling degree and the target subcooling degree is less than 0 (i.e., the current subcooling degree < the target subcooling degree), the smaller current subcooling degree indicates that the refrigerant in the condenser does not fully condense before entering the throttling device, which will affect the heating effect. The opening degree of the electronic expansion valve of the indoor unit is controlled to decrease, so that the refrigerant flow rate decreases, and the refrigerant has more time to condense in the condenser, improving the heating effect. When the difference between the calculated current subcooling degree and the target subcooling degree is equal to 0 (i.e., the current subcooling degree = the target subcooling degree), it means that the air-conditioning system is operating well in the heating mode, the condensation degree of the refrigerant in the condenser is appropriate, and the air-conditioning system is in an efficient and stable heating state. Therefore, the opening degree of the electronic expansion valve of the indoor unit is controlled to remain unchanged to ensure that the current subcooling degree remains unchanged and the stability and sustainability of the heating effect are ensured. When the difference between the calculated current subcooling degree and the target subcooling degree is greater than 0 (i.e., the current subcooling degree > the target subcooling degree), at this time, the refrigerant in the condenser is over-condensed and the refrigerant flow rate is insufficient, resulting in limited heating capacity. At this time, the opening degree of the electronic expansion valve of the indoor unit is controlled to increase to increase the refrigerant flow rate, enabling more refrigerant to participate in the heating cycle, improving the heating capacity, and making the indoor obtain a better heating effect.

[0058] Optionally, the number of adjustment rounds of the target superheat degree or the target subcooling degree is at least 3 rounds. If the (n - 1)-th round of adjustment is the first startup operation of the air-conditioning system, and the operating capacity of the indoor unit in the (n - 1)-th round is not less than the operating capacity of the indoor unit in the n-th round and greater than the operating capacity of the indoor unit in the (n + 1)-th round, then the optimal target superheat degree of the indoor unit is set to the current superheat degree at the first startup operation, or the optimal target subcooling degree is set to the current subcooling degree at the first startup operation; where n ≥ 1, and n represents the number of indoor units in the air-conditioning system.

[0059] When the (n - 1)-th round of adjustment is the first startup operation of the unit of the air-conditioning system, and there is a situation where the operating capacity of the indoor unit in the (n - 1)-th round is greater than the operating capacity of the indoor unit in the (n + 1)-th round, and at the same time, the operating capacity of the indoor unit in the (n - 1)-th round is not lower than the operating capacity of the indoor unit in the n-th round, the target superheat degree or the target subcooling degree corresponding to the first startup operation is determined as the optimal target superheat degree or the optimal target subcooling degree of the indoor unit. This is mainly because the operating capacity of the indoor unit corresponding to the target superheat degree or the target subcooling degree at the first startup operation is relatively good, and the target superheat degree or the target subcooling degree at the first startup operation can make the indoor unit reach a relatively optimal operating state to ensure the efficient operation of the indoor unit.

[0060] S205. Detect the current operating capacity of the indoor unit and adjust the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit.

[0061] Optionally, adjusting the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit includes:

[0062] Obtain the current operating capacity and the target operating capacity of the indoor unit;

[0063] Determine the number of indoor units with a current operating capacity greater than the target operating capacity as the first number of indoor units;

[0064] Calculate the proportion of the first number of indoor units to the total number of all powered-on indoor units in the air-conditioning system as the first proportion;

[0065] Determine the operating frequency of the compressor according to the relationship between the first proportion and the preset interval of the proportion.

[0066] In the above embodiments, by obtaining the current operating capacity and the target operating capacity of the indoor unit and calculating the first proportion, the overall operating state of the indoor unit can be understood in real time. Adjusting the operating frequency of the compressor according to the relationship between the proportion and the preset interval can accurately match the output of the compressor with the actual demand of the indoor unit. For example, when the current operating capacity of most indoor units is greater than the target operating capacity of the corresponding room, it indicates that the overall cooling or heating demand is low. At this time, reducing the operating frequency of the compressor can avoid excessive cooling or heating. When the first proportion is relatively high, that is, the current operating capacity of more indoor units exceeds the target operating capacity, reducing the operating frequency of the compressor can reduce unnecessary energy consumption. Reasonably adjusting the operating frequency of the compressor can effectively reduce the overall energy consumption. When the current operating capacity of most indoor units is lower than the target operating capacity, increasing the operating frequency of the compressor can quickly meet the cooling or heating demand and avoid energy waste caused by long-term inefficient operation. Dynamically adjusting the operating frequency of the compressor according to the actual demand enables the air-conditioning system to operate at a higher efficiency under different working conditions. When the compressor works at an appropriate frequency, its performance can be better exerted, and the energy utilization efficiency can be improved.

[0067] Optionally, determining the operating frequency of the compressor according to the relationship between the first proportion and the preset interval of the proportion includes:

[0068] Judge the size relationship between the first proportion and the preset interval of the proportion;

[0069] If the first proportion is greater than or equal to the maximum value of the preset interval of the proportion, reduce the operating frequency of the compressor to the first operating frequency;

[0070] If the first proportion is less than or equal to the minimum value of the preset interval of the proportion, increase the operating frequency of the compressor to the second operating frequency;

[0071] If the first quantity ratio is within the preset range of the quantity ratio, the current operating frequency of the compressor remains unchanged.

[0072] In the above embodiment, when the first quantity ratio is greater than or equal to the maximum value of the preset range of the quantity ratio, it indicates that the current operating capacity of more indoor units exceeds the target operating capacity of the rooms where they are located, and the overall cooling or heating demand is low. At this time, reducing the operating frequency of the compressor to the first operating frequency can reduce the energy consumption of the compressor, avoid excessive cooling or heating of the air-conditioning system, and thus reduce energy waste. If the first quantity ratio is less than or equal to the minimum value of the preset range of the quantity ratio, it means that the current operating capacity of most indoor units does not reach the target operating capacity of the rooms where they are located, and the overall cooling or heating demand is high. Increasing the operating frequency of the compressor to the second operating frequency can enable the air-conditioning system to quickly meet the indoor cooling and heating demands and avoid energy losses caused by long-term inefficient operation. When the first quantity ratio is within the preset range, the current operating frequency of the compressor is maintained to ensure stable operation of the system at an appropriate energy consumption level.

[0073] Specifically, the opening degree of the electronic expansion valve of the indoor unit is adjusted through the optimal target superheat or the optimal target subcooling degree. This is mainly based on the best operating state of the indoor unit under different working conditions. By adjusting the opening degree of the electronic expansion valve, the refrigerant can achieve an ideal evaporation effect or condensation effect in the indoor heat exchanger of the indoor unit, thereby ensuring that the operating capacity of the indoor unit reaches a relatively ideal level. During the process of adjusting the opening degree of the electronic expansion valve, the current operating capacity Q(n) of each indoor unit is continuously recorded, where n represents the number of the indoor unit, and the air-conditioning system in this embodiment includes n indoor units. At the same time, the target operating capacity Qi (i.e., the required capacity of the indoor unit) of each indoor unit is preset in advance. The target operating capacity Qi is comprehensively determined according to various factors such as the ambient temperature, set temperature, and room area of the room where the indoor unit is located, so as to reflect the operating capacity that the indoor unit needs to reach to meet the cooling or heating demand of the room where it is located. Then, the current operating capacity Q(n) of each indoor unit is compared with the target operating capacity Qi of the room where it is located one by one. The number of indoor units η whose current operating capacity Q(n) is greater than or equal to the target operating capacity Qi (i.e., the number of indoor units that can meet the cooling or heating demand of the rooms where they are located) is counted, and then the ratio η of the number of indoor units whose current operating capacity meets the target operating capacity of the rooms where they are located is calculated as η = n / N (N represents the number of all turned-on and operating indoor units in the air-conditioning system). The ratio η can intuitively reflect how many of the currently turned-on and operating indoor units have an operating capacity that meets or exceeds the demand.

[0074] Further, in order to reasonably adjust the operating frequency of the compressor according to the proportion η of the number of indoor units that meet the demand, it is necessary to preset judgment thresholds a and b (a > b > 0). According to historical experience, a is preferably 90% and b is preferably 80%. Determine the preset interval (b, a) of the quantity proportion according to the judgment thresholds a and b. When the calculated proportion η of the number of indoor units is greater than or equal to a, it means that the operating capacity of most current indoor units has exceeded the demand for the target operating capacity of the rooms where they are located. That is to say, the refrigeration capacity or heating capacity of the air-conditioning system is in a surplus state. Continuing to maintain the current operating frequency of the compressor at this time will cause waste of energy. To achieve the purpose of energy conservation, it is necessary to reduce the output of the compressor. By adjusting the current operating frequency f of the compressor, the adjusted operating frequency f is equal to the operating frequency f(n) before adjustment minus an adjustment amplitude β, that is, f = f(n) - β. The adjustment amplitude β is greater than 0 and is reasonably set based on the specific model, performance, and actual operating conditions of the air-conditioning system to ensure that the adjustment range of the compressor operating frequency can effectively reduce energy consumption without having too much impact on the normal operation of the air-conditioning system.

[0075] When the proportion η of the number of indoor units is less than or equal to b, it means that only a few current indoor units' operating capacity can meet the demand for the target operating capacity of the rooms where they are located, and the current operating capacity of most indoor units is insufficient. That is, the refrigeration capacity or heating capacity of the air-conditioning system cannot meet the current actual demand of the rooms where it is located, and the indoor temperature may not reach the set target value. To improve the refrigeration capacity or heating capacity of the air-conditioning system and enable the indoor environment to reach a comfortable state as soon as possible, it is necessary to increase the output of the compressor. By adjusting the current operating frequency f of the compressor to the operating frequency f(n) before adjustment plus the adjustment amplitude β, that is, f = f(n) + β. By increasing the operating frequency of the compressor, more refrigerant can circulate in the system, thereby improving the operating capacity of the indoor unit and meeting the indoor refrigeration or heating demand.

[0076] When the proportion η of the number of indoor units is within the preset interval (b, a) of the quantity proportion (i.e., b < η < a), it means that the current operating capacity of the indoor unit is in a relatively balanced state with the target operating capacity. At this time, the current operating frequency of the compressor can better meet the operating requirements of the air-conditioning system, neither causing waste of energy nor ensuring that the indoor temperature reaches a relatively comfortable level. Therefore, in this case, control the compressor to maintain the current operating frequency unchanged to keep the air-conditioning system running stably.

[0077] In some embodiments, when adjusting the target superheat or target subcooling of the indoor unit according to the operating capacity of the indoor unit and then adjusting the opening of the electronic expansion valve of the indoor unit according to the target superheat or target subcooling. It is also possible to directly adjust the opening of the electronic expansion valve of the indoor unit according to the operating capacity of the indoor unit. The corresponding control flow chart is asFigure 4 As shown, the difference from the control method in the foregoing embodiment is that there is no need to distinguish between the refrigeration mode and the heating mode. In each round of adjustment, the opening of the electronic expansion valve of the indoor unit is reduced by an opening x, where x > 0, after the adjustment in the previous round, so as to increase the refrigerant flow rate, change the physical state of the refrigerant, and improve the heat exchange efficiency. The rest of the control remains unchanged and will not be elaborated here.

[0078] According to another aspect of the embodiments of the present application, as Figure 5 shown, a control device for an air conditioning system is provided, including:

[0079] An optimal parameter determination module 501, configured to determine the change trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, and determine the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the change trend of the operating capacity;

[0080] An electronic expansion valve adjustment module 503, configured to adjust the opening of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree, so as to adjust the current operating capacity of the indoor unit;

[0081] A compressor adjustment module 505, configured to detect the current operating capacity of the indoor unit, and adjust the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit.

[0082] It should be noted that the optimal parameter determination module 501 in this embodiment can be used to execute step S202 in the embodiments of the present application, the electronic expansion valve adjustment module 503 in this embodiment can be used to execute step S204 in the embodiments of the present application, and the compressor adjustment module 505 in this embodiment can be used to execute step S206 in the embodiments of the present application.

[0083] It should be noted here that the examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the content disclosed in the above embodiments.

[0084] According to another aspect of the embodiments of the present application, the present application provides an electronic device, as Figure 6 shown, including a memory 601, a processor 603, a communication interface 605, and a communication bus 607. A computer program that can run on the processor 603 is stored in the memory 601. The memory 601 and the processor 603 communicate through the communication interface 605 and the communication bus 607. When the processor 603 executes the computer program, the steps of the above method are implemented.

[0085] In the above-mentioned electronic device, the memory and the processor communicate through a communication bus and a communication interface. The communication bus can be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc.

[0086] The memory can include a Random Access Memory (RAM), and can also include a non-volatile memory, such as at least one disk memory. Optionally, the memory can also be at least one storage device located far from the aforementioned processor.

[0087] The above-mentioned processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0088] According to another aspect of the embodiments of the present application, there is also provided a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the steps of any of the above embodiments.

[0089] Optionally, in the embodiments of the present application, the computer-readable medium is set to store program codes for the processor to execute the following steps:

[0090] Step S202, determining the change trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, and determining the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the change trend of the operating capacity;

[0091] Step S204, adjust the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree, so as to adjust the current operating capacity of the indoor unit;

[0092] Step S206, detect the current operating capacity of the indoor unit, and adjust the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit.

[0093] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and will not be elaborated herein.

[0094] When the embodiments of the present application are specifically implemented, reference may be made to the above embodiments, and corresponding technical effects are achieved.

[0095] It can be understood that these embodiments described herein can be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in the present application, or a combination thereof.

[0096] For software implementation, the technologies described herein can be implemented by units that execute the functions described herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented inside or outside the processor.

[0097] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0098] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0099] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0100] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0101] In addition, in each embodiment of this application, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0102] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiments of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs that can store program codes. It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0103] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A control method for an air conditioning system, characterized in that, Including: Determine the variation trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, and determine the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the variation trend of the operating capacity; Adjust the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree to adjust the current operating capacity of the indoor unit; Detect the current operating capacity of the indoor unit, and adjust the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit.

2. The control method of the air conditioning system according to claim 1, characterized in that, The determining the variation trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, and determining the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the variation trend of the operating capacity includes: Determine the total capacity demand of all the indoor units that are turned on in the air conditioning system according to the ambient temperature of the room where the indoor unit is located, the set temperature of the indoor unit, and the capacity of the indoor unit; Calculate the initial operating frequency of the compressor according to the total capacity demand, and control the compressor to operate at the initial operating frequency; Control the opening degree of the electronic expansion valve according to the initial target superheat degree or the initial target subcooling degree of the indoor unit, and adjust the target superheat degree or the target subcooling degree based on a preset increase amplitude until a predetermined number of adjustment rounds is reached to obtain the optimal target superheat degree or the optimal target subcooling degree.

3. The control method of the air conditioning system according to claim 2, characterized in that, The controlling the opening degree of the electronic expansion valve according to the initial target superheat degree or the initial target subcooling degree of the indoor unit, and adjusting the target superheat degree or the target subcooling degree based on a preset increase amplitude until a predetermined number of adjustment rounds is reached to obtain the optimal target superheat degree or the optimal target subcooling degree includes: When the indoor unit is in the cooling mode, control the opening degree of the electronic expansion valve of the indoor unit based on the initial target superheat degree, and when the indoor unit is in the heating mode, control the opening degree of the electronic expansion valve of the indoor unit based on the initial target subcooling degree; After the indoor unit operates for a first preset duration, if the indoor unit is in the cooling mode, obtain the target superheat degree for the next round based on the current target superheat degree and a first preset increase amplitude, and if the indoor unit is in the heating mode, obtain the target subcooling degree for the next round based on the current target subcooling degree and a second preset increase amplitude; Control the indoor unit to operate for a second preset duration based on the target superheat degree or the target subcooling degree for the next round and obtain the operating capacity of the indoor unit; After the indoor unit operates for the second preset duration, adjust the target superheat degree based on the first preset increase amplitude or adjust the target subcooling degree based on the second preset increase amplitude until the operating capacity of the indoor unit corresponding to the target superheat degree or the target subcooling degree in the nth round is not less than that in the (n - 1)th round and greater than that in the (n + 1)th round, then stop adjusting the target superheat degree or the target subcooling degree; where n ≥ 1 and n represents the number of indoor units in the air conditioning system; Set the optimal target superheat degree or the optimal subcooling degree as the value adjusted in the nth round.

4. The control method of the air conditioning system according to claim 2, characterized in that, Before determining the variation trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, it further includes: Detect whether the air conditioning system has a memory function; if so, execute the next step; if not, use the initial value given by the controller as the initial target superheat degree or the initial target subcooling degree for this round of operation. Detect whether there is an optimal target superheat or an optimal target subcooling degree that meets the similar scenarios set based on the operating conditions of the air conditioning system in the indoor unit; If it exists, use the optimal target superheat or the optimal target subcooling degree as the initial target superheat or the initial target subcooling degree for this round of operation; If it does not exist, use the initial value given by the controller as the initial target superheat or the initial target subcooling degree for this round of operation.

5. The control method of the air-conditioning system according to claim 1, characterized in that, Adjusting the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat or the optimal target subcooling degree includes: When the air conditioning system is in the cooling mode, detect the magnitude relationship between the current superheat of the indoor unit and the target superheat; wherein, the current superheat is the difference between the temperature of the refrigerant after evaporation through the indoor heat exchanger and the saturation temperature corresponding to the refrigerant pressure; if the current superheat is less than the target superheat, reduce the opening degree of the electronic expansion valve of the indoor unit; if the current superheat is equal to the target superheat, keep the opening degree of the electronic expansion valve of the indoor unit unchanged; if the current superheat is greater than the target superheat, increase the opening degree of the electronic expansion valve of the indoor unit; and / or, When the air conditioning system is in the heating mode, detect the magnitude relationship between the current subcooling of the indoor unit and the target subcooling; wherein, the current subcooling is the difference between the saturation temperature corresponding to the refrigerant pressure after condensation through the indoor heat exchanger and the refrigerant temperature; if the current subcooling is less than the target subcooling, reduce the opening degree of the electronic expansion valve of the indoor unit; if the current subcooling is equal to the target subcooling, keep the opening degree of the electronic expansion valve of the indoor unit unchanged; if the current subcooling is greater than the target subcooling, increase the opening degree of the electronic expansion valve of the indoor unit.

6. The control method of the air conditioning system according to claim 1, characterized in that The number of adjustment rounds of the target superheat or the target subcooling degree is at least 3 rounds. If the (n - 1)-th round of adjustment is the first startup operation of the air conditioning system, and the operating capacity of the indoor unit in the (n - 1)-th round is not less than the operating capacity of the indoor unit in the n-th round and greater than the operating capacity of the indoor unit in the (n + 1)-th round, then the optimal target superheat of the indoor unit is set to the current superheat at the first startup operation or the optimal target subcooling degree is set to the current subcooling degree at the first startup operation; where n ≥ 1, and n represents the number of indoor units in the air conditioning system.

7. The control method of the air conditioning system according to claim 1, characterized in that, Adjusting the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit includes: Obtain the current operating capacity and the target operating capacity of the indoor unit; Determine the number of indoor units with the current operating capacity greater than the target operating capacity and use it as the number of the first indoor units; Calculate the proportion of the number of the first indoor units to the number of all started-up indoor units in the air conditioning system as the first proportion; Determine the operating frequency of the compressor according to the relationship between the first proportion and the preset interval of the proportion.

8. The control method of the air-conditioning system according to claim 7, characterized in that, Determining the operating frequency of the compressor according to the relationship between the first proportion and the preset interval of the proportion includes: Judge the magnitude relationship between the first proportion and the preset interval of the proportion; If the first quantity proportion is greater than or equal to the maximum value of the preset range of the quantity proportion, then reduce the operating frequency of the compressor to the first operating frequency; If the first quantity proportion is less than or equal to the minimum value of the preset range of the quantity proportion, then increase the operating frequency of the compressor to the second operating frequency; If the first quantity proportion is within the preset range of the quantity proportion, then maintain the current operating frequency of the compressor unchanged.

9. An air conditioning system, characterized in that, Comprising: An outdoor unit section, the outdoor unit section includes a gas-liquid separator, a compressor, a four-way valve, an outdoor heat exchanger and an outdoor electronic expansion valve. The outlet of the gas-liquid separator is connected to the suction side of the compressor. The discharge side of the compressor is connected to the first port of the four-way valve. The second port of the four-way valve is connected to one end of the outdoor heat exchanger. The other end of the outdoor heat exchanger is connected to the outdoor electronic expansion valve; An indoor unit section, the indoor unit section includes n indoor units. The indoor unit includes an indoor heat exchanger and an indoor electronic expansion valve connected to the indoor heat exchanger. The indoor electronic expansion valve is connected to the pipeline where the outdoor electronic expansion valve is located. The indoor heat exchanger is connected to the third port of the four-way valve through a pipeline. The fourth port of the four-way valve is connected to the inlet of the gas-liquid separator; where n≥1, and n represents the number of indoor units in the air-conditioning system.

10. A control device for an air conditioning system, characterized in that, Comprising: An optimal parameter determination module, configured to determine the change trend of the operating capacity of the indoor unit at different target superheat degrees or different target subcooling degrees, and determine the optimal target superheat degree or the optimal target subcooling degree of the indoor unit according to the change trend of the operating capacity; An electronic expansion valve adjustment module, configured to adjust the opening degree of the electronic expansion valve of the indoor unit according to the optimal target superheat degree or the optimal target subcooling degree, so as to adjust the current operating capacity of the indoor unit; A compressor adjustment module, configured to detect the current operating capacity of the indoor unit, and adjust the operating frequency of the compressor according to the deviation between the target operating capacity and the current operating capacity of the indoor unit.

11. An electronic device, comprising a memory, a processor, a communication interface, and a communication bus, wherein a computer program that can run on the processor is stored in the memory, and the memory and the processor communicate through the communication bus and the communication interface, and is characterized in that, When the processor executes the computer program, it implements the control method of the air-conditioning system according to any one of claims 1 to 8.

12. A readable storage medium storing program instructions, when the program instructions are read and executed by a computing device, the computing device is caused to execute the control method of the air-conditioning system according to any one of claims 1 to 8 above.

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