Air conditioning system

Abstract

The invention provides an air conditioning system which comprises an indoor unit, an indoor electronic expansion valve, an outdoor unit, a compressor and a processing device and comprises a load estimation part, a temperature estimation part, a superheat degree estimation part, an opening degree estimation part and a control part. The load presumption part is used for obtaining air conditioner area loads corresponding to the indoor units in the running state in the starting stage, presuming the total load of an air conditioner system and presuming the initial running frequency of a compressor based on the total load of the air conditioner system. The temperature estimation part is used for estimating the required evaporation temperature of each indoor unit in the operation state based on the air conditioning area load; the superheat degree presumption part is used for presuming the target superheat degree of each indoor unit in the running state based on the required evaporation temperature; the opening degree presumption part is used for presuming the initial opening degree of each corresponding indoor electronic expansion valve based on the target superheat degree; the control part is used for executing control in the starting-up stage based on the initial operation frequency and the initial opening degree of the compressor. The air conditioner can meet the requirements of different indoor units.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning system. Background Art

[0002] Traditional air-conditioning systems (including multi-split air-conditioning systems) usually use the temperature difference between the indoor temperature and the set temperature as input, and calculate the air-conditioning system operating parameters (such as the compressor operating frequency) based on the PID control algorithm as the basis for regulating and controlling the air-conditioning system.

[0003] The performance of a PID control algorithm (or PID controller) typically depends on three key parameters: proportional gain (often denoted as Kp), integral time (often denoted as Ti), and derivative time (often denoted as Td). These three parameters are determined through experiments or theoretical analysis under fixed operating conditions and do not consider system variations at different operating points, load changes, or other conditions.

[0004] The static parameters of the PID control algorithm cause performance to degrade when the system operating conditions change, especially during the startup phase, when it is impossible to dynamically generate matching operating parameters based on the actual building load. For example, when the indoor unit is in a large temperature difference and small load environment, or when the indoor unit is in a small temperature difference and large load environment, or when some indoor units are in a large temperature difference and small load environment, and some indoor units are in a small temperature difference and large load environment, it is easy for the compressor target frequency to be too low in the initial operation phase, the required evaporating temperature to be too high, and the temperature of the air-conditioned area to fail to reach the set temperature for a long time; or the compressor target frequency may be too high and the required evaporating temperature to be too low, resulting in frequent starts and stops of the compressor and frequent fluctuations in the temperature of the air-conditioned area. Summary of the Invention

[0005] To solve the above problems, the present invention provides an air conditioning system.

[0006] The air conditioning system includes at least one indoor unit, which is correspondingly provided with an indoor electronic expansion valve; an outdoor unit fluidly connected to the indoor unit, which is provided with a compressor. The air conditioning system can operate in a cooling mode.

[0007] In one or more embodiments of the present application, the air-conditioning system further includes a processing device, which includes a load estimation unit, a temperature estimation unit, a superheat estimation unit, an opening estimation unit and a control unit; wherein the load estimation unit is configured to obtain the air-conditioning area load corresponding to the indoor unit in the operating state during the startup phase, estimate the total load of the air-conditioning system, and estimate the initial operating frequency of the compressor based on the total load of the air-conditioning system; the temperature estimation unit is configured to estimate the required evaporating temperature of each indoor unit in the operating state based on the air-conditioning area load; the superheat estimation unit is configured to estimate the target superheat of each indoor unit in the operating state based on the required evaporating temperature; the opening estimation unit is configured to estimate the initial opening of each corresponding indoor electronic expansion valve based on the target superheat; and the control unit is configured to perform control during the startup phase based on the initial operating frequency and initial opening of the compressor.

[0008] In one or more embodiments of the present application, the load estimation unit is configured to obtain operating condition parameters of the compressor suction side, and generate an initial operating frequency of the compressor based on a frequency estimation condition determined according to the compressor suction side parameters, compressor performance parameters and the total load of the air-conditioning system.

[0009] In one or more embodiments of the present application, the air-conditioning system further includes a generating unit; the generating unit is configured to generate frequency estimation conditions based on frequency estimation training data, the frequency estimation training data including multiple compressor operating frequencies, multiple air-conditioning system total loads, multiple compressor suction pressures, compressor suction volumes, compressor maximum suction pressures, and compressor minimum suction pressures.

[0010] In one or more embodiments of the present application, the temperature estimation unit is configured to obtain the regional temperature of the air-conditioning area corresponding to the indoor unit, and generate the required evaporation temperature of each indoor unit in operation based on the temperature estimation conditions established according to the regional temperature, the air-conditioning area load and the control cycle.

[0011] In one or more embodiments of the present application, the generating unit is configured to generate temperature estimation conditions based on temperature estimation training data, the temperature estimation training data including multiple required evaporating temperatures, multiple air-conditioning zone temperatures, multiple air-conditioning zone loads, and a control cycle.

[0012] In one or more embodiments of the present application, the superheat estimation unit is configured to obtain the regional temperature of the air-conditioning area corresponding to the indoor unit, and generate a target superheat for each indoor unit in operation based on a superheat estimation condition established according to the regional temperature and the minimum value of the required evaporation temperature of the indoor unit in operation estimated by the temperature estimation unit.

[0013] In one or more embodiments of the present application, the superheat estimation unit is configured to obtain the regional temperature of the air-conditioning area corresponding to the indoor unit, and generate a target superheat for each indoor unit in operation based on a superheat estimation condition established according to the regional temperature, the minimum value of the required evaporating temperature of the indoor unit in operation estimated by the temperature estimation unit, and a superheat correction coefficient; the superheat estimation unit can set the target superheat of the indoor unit estimated to have the minimum required evaporating temperature to 0.

[0014] In one or more embodiments of the present application, the superheat correction coefficient is generated based on a proportional relationship between the actual required capacity of the indoor unit and the capacity threshold.

[0015] In one or more embodiments of the present application, the opening estimation unit is configured to obtain the target superheat estimated by the superheat estimation unit, and the opening estimation conditions determined based on the target superheat, the set superheat threshold and the performance parameters of the indoor electronic expansion valve, to generate the corresponding initial opening of each indoor electronic expansion valve.

[0016] In one or more embodiments of the present application, the processing device also includes a conditional inference unit; the conditional inference unit is configured to obtain the set temperature difference of the indoor unit in the operating state during the startup phase, and the corresponding air-conditioning area load, and infer whether the set temperature difference of at least one indoor unit is higher than the upper limit threshold of the reference temperature difference, but the corresponding air-conditioning area load is lower than the lower limit threshold of the reference load; the upper limit threshold of the reference temperature difference is a benchmark for determining whether the set temperature difference of the indoor unit is higher than the upper limit expected difference, and the reference load threshold is a benchmark for determining whether the air-conditioning area load corresponding to the indoor unit is lower than the lower limit expected load.

[0017] In one or more embodiments of the present application, the conditional inference unit is further configured to obtain the set temperature difference of the indoor unit in the operating state during the startup phase, and the corresponding air-conditioning area load, and to infer whether the set temperature difference of at least one indoor unit is lower than the lower limit threshold of the reference temperature difference, but the corresponding air-conditioning area load is higher than the upper limit threshold of the reference load; the lower limit threshold of the reference temperature difference is a benchmark for determining whether the set temperature difference of the indoor unit is lower than the lower limit expected difference, and the reference load threshold is a benchmark for determining whether the air-conditioning area load corresponding to the indoor unit is higher than the upper limit expected load.

[0018] In one or more embodiments of the present application, the load estimation unit is configured to estimate the total load of the air-conditioning system when the set temperature difference of at least one indoor unit is higher than the reference temperature difference threshold, but the corresponding air-conditioning area load is lower than the reference load threshold, and estimate the initial operating frequency of the compressor based on the total load of the air-conditioning system.

[0019] This application can adapt to the needs of different indoor units by dynamically inferring and adjusting various parameters, making the air-conditioning system more flexible and intelligent.

[0020] Other features and advantages of the present invention will become more apparent after reading the detailed description of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 is a schematic structural diagram of an air conditioning system provided by one or more embodiments of the present invention;

[0023] Figure 2 is a schematic structural diagram of an air conditioning system provided by one or more embodiments of the present invention;

[0024] Figure 3 is a schematic structural diagram of an air conditioning system provided by one or more embodiments of the present invention;

[0025] Figure 4 is a schematic structural diagram of an air conditioning system provided by one or more embodiments of the present invention;

[0026] Figure 5 is a schematic structural diagram of an air conditioning system provided by one or more embodiments of the present invention;

[0027] Figure 6 is a flow chart of an air conditioning system provided by one or more embodiments of the present invention;

[0028] Figure 7 is a schematic structural diagram of an air conditioning system provided by one or more embodiments of the present invention;

[0029] Figure 8 is a flow chart of an air conditioning system provided by one or more embodiments of the present invention;

[0030] Figure 9 is a flow chart of an air conditioning system provided by one or more embodiments of the present invention;

[0031] Figure 10 is a flow chart of an air conditioning system provided by one or more embodiments of the present invention;

[0032] Figure 11 is a flow chart of an air conditioning system provided by one or more embodiments of the present invention;

[0033] Figure 12is a flow chart of an air conditioning system provided by one or more embodiments of the present invention;

[0034] Figure 13 is a schematic structural diagram of an air conditioning system provided by one or more embodiments of the present invention;

[0035] Figure 14 is a flow chart of an air conditioning system provided by one or more embodiments of the present invention;

[0036] Figure 15 is a flow chart of an air conditioning system provided by one or more embodiments of the present invention;

[0037] Figure 16 is a schematic structural diagram of an air conditioning system provided by one or more embodiments of the present invention;

[0038] In the figure: 10, outdoor unit; 101, compressor; 102, oil separator; 103, gas-liquid separator; 104, switching valve; 105, outdoor heat exchanger; 106-1, indoor heat exchanger; 106-2, indoor heat exchanger; 106-n, indoor heat exchanger; 107, outdoor electronic expansion valve; 108-1, indoor electronic expansion valve; 108-2, indoor electronic expansion valve; 108-n, indoor electronic expansion valve; 109, liquid side piping; 110, gas side piping; 111, oil return capillary; 112, liquid side stop valve; 113, gas side stop valve; 114, outdoor fan; 20-1, indoor unit; 20-2, indoor unit; 20-n, indoor unit; 10 6-1, indoor heat exchanger; 106-2, indoor heat exchanger; 106-n, indoor heat exchanger; 115-1, indoor fan; 115-2, indoor fan; 115-n, indoor fan; 200, processing device; 201, load estimation unit; 202, temperature estimation unit; 203, superheat estimation unit; 204, opening estimation unit; 205, control unit; 206, generation unit; 207, condition estimation unit; 301, processor; 302, non-volatile memory; 303, volatile memory; 304, display device; 305, operating device; 306, communication interface; 307, drive device; 308, bus; 309, storage medium; 310, storage medium. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above", and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below", and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and the use of other materials.

[0045] Figure 1 A schematic structural diagram of an air conditioning system provided by one or more specific embodiments of the present invention is shown.

[0046] The air conditioning system is installed in buildings such as apartments, hotels, office buildings, and residences. In one or more embodiments of the present invention, the air conditioning system is a multi-split system.

[0047] The air conditioning system incorporates a refrigeration cycle. The refrigeration cycle utilizes a compressor 101, a condenser, a throttling device, and an evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat the indoor space.

[0048] In principle, low-temperature, low-pressure refrigerant enters compressor 101, which compresses it into high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser, which condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0049] The throttling device expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the throttling device and returns the low-temperature, low-pressure refrigerant gas to the compressor 101. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. Throughout this cycle, the air conditioning system can regulate the temperature of the indoor space.

[0050] In one or more embodiments of the present application, the throttling device includes an indoor electronic expansion valve 108 .

[0051] In one or more embodiments of the present application, the air conditioning system includes an outdoor unit 10 and an indoor unit 20 connected to each other.

[0052] In one or more embodiments of the present application, the air conditioning system includes an outdoor unit 10 and a plurality of indoor units 20 connected to each other. Figure 1 A plurality of indoor units (such as Figure 1 20-1, 20-2, ..., 20-n), Figure 2 Two indoor units 20 are shown in FIG. Figure 1 20-1 and 20-2 in the figure), but in the present application, there is no particular limit on the number of indoor units 20. More indoor units 20 can be arranged in one air conditioning system in the same manner as the indoor unit 20 shown in the figure, or only one indoor unit can be provided.

[0053] The indoor unit 20 and the outdoor unit 10 are connected by a liquid pipe 109 and a gas pipe 110. The liquid pipe 109 and the gas pipe 110 are used to allow the refrigerant to flow so that the refrigerant can form a refrigerant circuit and circulate therein.

[0054] In one or more embodiments of the present application, a liquid-side shutoff valve 112 is provided on the liquid-side piping 109 .

[0055] In one or more embodiments of the present application, a gas-side shutoff valve 113 is provided on the gas-side piping 110 .

[0056] The following describes the basic structure and functions of the outdoor unit 10. Using the same system architecture, the number of outdoor units 10 in the air conditioning system can be expanded to multiple units, each operating in a group. The outdoor unit 10 is configured to correspond to the outdoor electronic expansion valve 107.

[0057] In one or more embodiments of the present application, the outdoor unit 10 refers to the portion of the refrigeration cycle that includes the compressor 101 and the outdoor heat exchanger 105. The outdoor unit 10 can perform heating or cooling operations outdoors to provide energy to the indoor unit 20 for raising or lowering the indoor temperature. The outdoor unit 10 is also equipped with a gas-liquid separator 103, an outdoor fan 114, and a reversing valve.

[0058] In one or more embodiments of the present application, a liquid storage tank may also be provided in the outdoor unit 10 .

[0059] In one or more embodiments of the present application, the outdoor unit 10 may also be provided with an oil separator 102. The oil separator 102 functions in the air conditioning system to separate lubricating oil from refrigerant. Since the compressor 101 requires lubricating oil to reduce friction and wear to ensure normal operation, and since the lubricating oil mixes with the refrigerant during operation, the oil separator 102 separates the lubricating oil from the refrigerant through physical separation (e.g., centrifugal force or gravity). The separated lubricating oil is recovered and recycled, while the refrigerant continues to flow.

[0060] In one or more embodiments of the present application, an oil return capillary 111 may also be provided in the outdoor unit 10. The function of the oil return capillary 111 in the air-conditioning system is to recover the lubricating oil and guide it back to the compressor 101; specifically, through the principles of adsorption and guidance, the deposited lubricating oil is recovered and guided into the lubrication system of the compressor 101, thereby realizing the recycling of the lubricating oil.

[0061] During heating operation, the outdoor unit 10 can form a refrigerant circuit for heating operation, which is connected in sequence from the liquid side piping 109 to the gas side piping 110 to the outdoor electronic expansion valve 107, the outdoor heat exchanger 105, the switching valve 104 (for example, the passage between the E port and the S port of the four-way valve), the gas-liquid separator 103, the compressor 101 and the switching valve 104 (for example, the passage between the D port and the C port of the four-way valve).

[0062] In cooling operation, the outdoor unit 10 can form a refrigerant circuit for cooling operation, which is connected in sequence from the gas side piping 110 to the liquid side piping 109 to the switching valve 104 (for example, the passage between the C port and the S port of the four-way valve), the gas-liquid separator 103, the compressor 101, the switching valve 104 (for example, the passage between the D port and the E port of the four-way valve), the outdoor heat exchanger 105 and the outdoor electronic expansion valve 107. Figure 3 As shown by arrow F.

[0063] Compressor 101 is configured to draw in and compress refrigerant to a high-temperature, high-pressure state. The suction side of compressor 101 is defined as the low-pressure side, and the discharge side of compressor 101 is defined as the high-pressure side. In heating mode, outdoor electronic expansion valve 107 is positioned toward the low-pressure side, while in cooling mode, it is positioned toward the high-pressure side. The speed of compressor 101 is variably controlled by an inverter.

[0064] The outdoor heat exchanger 105 is configured to function as a condenser in cooling operation and as an evaporator in heating operation. The outdoor heat exchanger 105 can exchange heat with the air guided by the outdoor fan 114 to cause the refrigerant flowing in the outdoor heat exchanger 105 to undergo a phase change (condensation or evaporation).

[0065] In one or more embodiments of the present application, the speed of the outdoor fan 114 can be controlled to change the flow rate of air heat exchanged with the outdoor heat exchanger 105 by adjusting the speed. The outdoor fan 114 can be an axial flow fan, a cross flow fan, or other optional fan types. The outdoor fan 114 is disposed near the outdoor heat exchanger 105.

[0066] The gas-liquid separator 103 is provided on the suction side of the compressor 101 and is a shell-shaped component for separating the gas and liquid of the refrigerant and storing the separated refrigerant. The gas-liquid separator 103 can store excess refrigerant.

[0067] The following describes the structure and function of the indoor units 20, taking two indoor units 20-1 and 20-2 as examples. The following description is also applicable to the other indoor units 20.

[0068] The indoor unit 20 performs cooling operation or heating operation using the energy generated by the outdoor unit 10 to increase the indoor temperature or to reduce the indoor temperature. Figure 2As shown, the indoor unit 20 - 1 includes a connected indoor heat exchanger 106 - 1 and an indoor electronic expansion valve 108 - 1 , and the indoor unit 20 - 2 includes a connected indoor heat exchanger 106 - 2 and an indoor electronic expansion valve 108 - 2 .

[0069] The indoor heat exchanger 106 - 1 and the indoor heat exchanger 106 - 2 function as condensers in the heating operation and function as evaporators in the cooling operation.

[0070] The indoor electronic expansion valve 108 - 1 and the indoor electronic expansion valve 108 - 2 are configured to reduce the pressure of the refrigerant and expand it.

[0071] The openings of the outdoor electronic expansion valve 107, the indoor electronic expansion valve 108-1 and the indoor electronic expansion valve 108-2 are all adjustable to control the flow and pressure of the refrigerant. For example, the opening can be adjusted by the number of steps of the motor inside the electronic expansion valve. The number of steps refers to the fixed angle that the motor rotates each time it runs.

[0072] The indoor unit 20-1 is further provided with an indoor fan 115-1, and the indoor unit 20-2 is further provided with an indoor fan 115-2. The indoor fans 115-1 and 115-2 may be axial flow fans, cross flow fans, or other optional fan types.

[0073] In one or more embodiments of the present application, Figure 4 As shown, the air conditioning system further includes a processing device 200 .

[0074] Figure 16 This is a block diagram showing the structure of the hardware structure of the processing device 200. The processing device 200 includes components such as a processor 301, a volatile memory 303, a non-volatile memory 302, a display device 304, an operating device 305, a communication interface 306, and a drive device 307, which are interconnected through a bus. The processor 301 can be a dedicated processor 301, a central processing unit (CPU), etc. The processor 301 can access the storage unit to execute instructions or applications stored in the storage unit to implement related functions. The display device is a display device used to display various information, the operating device is an operating device for receiving various operations, and the drive device is a hardware interrupt that interacts with the storage medium. In one or more embodiments of the present application, the storage medium (such as Figure 16 Storage media (such as CD-ROM, floppy disk, magneto-optical disk, etc.) include media that record information optically, electrically or magnetically. Figure 16 309) may also be a semiconductor memory such as ROM, flash memory, etc. that records information electrically.

[0075] The processing device 200 may be an outdoor controller in an outdoor unit of an air-conditioning system, for example, a system on board built based on an MCU.

[0076] The functional configuration of the processing device 200 will be described below with reference to the drawings.

[0077] In one or more embodiments of the present application, Figure 5 As shown, the processing device 200 includes a load estimation unit 201, a temperature estimation unit 202, a superheat estimation unit 203, an opening estimation unit 204, and a control unit 205. Each of these components can be implemented by the processor 301 executing a program.

[0078] In one or more embodiments of the present application, the load estimating unit 201 is configured to obtain the air-conditioning area load corresponding to the indoor unit in the startup phase, estimate the total load of the air-conditioning system, and estimate the initial operating frequency of the compressor based on the total load of the air-conditioning system.

[0079] In one or more embodiments of the present application, the temperature estimating unit 202 is configured to estimate the required evaporating temperature of each indoor unit in operation based on the load of the air-conditioning area.

[0080] In one or more embodiments of the present application, the superheat estimating unit 203 is configured to estimate a target superheat of each indoor unit in operation based on the required evaporating temperature.

[0081] In one or more embodiments of the present application, the opening degree estimating unit 204 is configured to estimate the initial opening degree of each corresponding indoor electronic expansion valve based on the target superheat degree estimated by the superheat degree estimating unit 203 .

[0082] In one or more embodiments of the present application, the control unit 205 is configured to perform control during the startup phase based on the initial operating frequency and initial opening degree of the compressor.

[0083] In one or more embodiments of the present application, the processing device 200 performs the following Figure 6 The method shown specifically includes the following steps:

[0084] Step S11: obtaining the air-conditioning area load corresponding to the indoor unit in the startup phase, estimating the total load of the air-conditioning system, and estimating the initial operating frequency of the compressor based on the total load of the air-conditioning system.

[0085] Step S12: Estimate the required evaporating temperature of each indoor unit in operation based on the air-conditioning area load.

[0086] Step S13: Estimate the target superheat degree of each indoor unit in operation based on the required evaporation temperature.

[0087] Step S14: Estimate the initial opening degree of each corresponding indoor electronic expansion valve based on the target superheat degree.

[0088] Step S15: executing control in the startup phase based on the initial operating frequency and initial opening degree of the compressor.

[0089] In the air-conditioning system provided by one or more embodiments of the present application, the processing device 200 can adapt to the actual needs of different indoor units in a more personalized manner through the load estimation unit 201, the temperature estimation unit 202, the superheat estimation unit 203, the opening estimation unit 204 and the control unit 205 working in collaboration, which helps to more accurately control the operating status of each indoor unit, and provides more process information in the startup phase at the beginning of operation, which can more effectively control the flow of refrigerant. By dynamically estimating and adjusting various parameters, it can adapt to the needs of different indoor units, making the air-conditioning system more flexible and intelligent compared to the static PID control algorithm.

[0090] The actual load of the air-conditioned area can be obtained by using existing building energy efficiency simulation software, load calculation algorithms, etc. to obtain the actual load data of the air-conditioned area, that is, to estimate the heat load of the air-conditioned area.

[0091] In one or more embodiments of the present application, the actual load of the air-conditioned area is determined by one or more of the following: building structure (floor area, floor height, building materials, etc.), climate conditions (outdoor temperature, relative humidity, solar radiation), occupant activity (number of occupants, occupant activity level), and equipment and lighting conditions (electrical equipment energy consumption, lighting equipment power consumption). For example, the heat load of the air-conditioned area estimated by building energy efficiency simulation software can be further corrected based on climate conditions, occupant activity, equipment, and lighting conditions to obtain a relatively accurate air-conditioned area load.

[0092] Q i represents the air-conditioning area load corresponding to the i-th indoor unit, and further infers the total load of the air-conditioning system. The total load of the air-conditioning system can be expressed as Q, Where n represents the number of indoor units.

[0093] In one or more embodiments of the present application, the load estimation unit 201 is configured to obtain the operating status of the suction side of the compressor, and generate the initial operating frequency of the compressor based on the frequency estimation condition determined according to the suction side parameters of the compressor, the compressor performance parameters and the total load of the air conditioning system, such as Figure 8 As shown in step S21 and step S22.

[0094] In one or more embodiments of the present application, the frequency estimation condition includes a pre-configured data relationship table including compressor suction side parameters, compressor performance parameters and total load of the air-conditioning system, a control algorithm or an empirical formula, which is used to generate the initial operating frequency of the compressor based on the operating conditions of the compressor suction side.

[0095] In one or more embodiments of the present application, the frequency estimation condition may be a prediction model.

[0096] like Figure 7 As shown, in one or more embodiments of the present application, the frequency estimation condition may be generated by the generating unit 206. The generating unit 206 is configured to generate the frequency estimation condition based on frequency estimation training data, the frequency estimation training data including a plurality of compressor operating frequencies, a plurality of air conditioning system total loads, a plurality of compressor suction pressures, a compressor suction volume, a compressor maximum suction pressure, and a compressor minimum suction pressure.

[0097] In one or more embodiments of the present application, the frequency estimation condition may be the following empirical formula:

[0098]

[0099] Among them, H is the initial operating frequency of the compressor, V is the suction volume of the compressor, P s_max is the maximum suction pressure of the compressor, P s_min is the minimum suction pressure of the compressor, a and b are fitting coefficients respectively.

[0100] The following describes the process of fitting the above empirical formula. First, under experimental conditions, multiple sets of known compressor operating frequencies, total air conditioning system loads, compressor suction pressures, compressor suction volumes, maximum compressor suction pressures, and minimum compressor suction pressures are collected as frequency estimation training data.

[0101] Then the above empirical formula is used as the fitting model, in which a and b are the fitting coefficients that need to be fitted.

[0102] Define an objective function, which can be, for example, the sum of squares of the errors between the actual observations H′ and the model predictions H.

[0103] By adjusting the fitting coefficients a and b, the objective function is minimized.

[0104] Execute an optimization algorithm (such as gradient descent, least squares method, etc.) to find the fitting coefficients a and b that minimize the objective function.

[0105] In one or more embodiments of the present application, the generation unit 206 can also build a prediction model based on the frequency estimation training data. Specifically, the following steps are included: pre-processing the frequency estimation training data, including data cleaning, missing value processing, outlier processing, etc., to ensure the accuracy and completeness of the data, and dividing it into a data set for training and a data set for evaluation according to a set ratio. Further, a regression model can be selected, such as linear regression, support vector machine regression, random forest regression or neural network, etc. The selected regression model is trained using the training data set, and the total load of the air-conditioning system, the compressor suction pressure, the compressor suction volume, the maximum suction pressure of the compressor and the minimum suction pressure of the compressor are used as input features, and the compressor operating frequency is used as the target output. After the training is completed, the model is evaluated using the data set for evaluation, and the error index between the predicted result and the true value is calculated to evaluate the model performance. According to the evaluation results, the model is tuned and optimized until satisfactory model performance is obtained, and the trained model is used as the frequency estimation condition.

[0106] In one or more embodiments of the present application, the temperature estimation unit 202 is configured to obtain the regional temperature of the air-conditioning area corresponding to the indoor unit, and generate the required evaporation temperature of each indoor unit in operation based on the temperature estimation conditions established according to the regional temperature, the air-conditioning area load, and the control period, such as Figure 9 As shown in step S31 and step S32.

[0107] In one or more embodiments of the present application, the temperature estimation condition may be a data relationship table, a control algorithm, or an empirical formula.

[0108] In one or more embodiments of the present application, the temperature estimation condition may be a prediction model.

[0109] In one or more embodiments of the present application, the temperature estimation condition may be generated by the generator 206. The generator 206 is configured to generate the temperature estimation condition based on temperature estimation training data, which includes regional temperatures of multiple air-conditioning zones, multiple air-conditioning zone loads, and control cycles.

[0110] In one or more embodiments of the present application, the temperature estimation condition may be the following empirical formula:

[0111] T lo_i =T i_i -Q i / t×c i

[0112] Among them, T lo_i is the required evaporation temperature of each indoor unit, T i_iis the regional temperature of the air-conditioning area, that is, the return air temperature of each indoor unit in operation; t is the control period, c i is the fitting coefficient of each indoor unit in operation, i=1,...,n.

[0113] The following describes the process of fitting the above empirical formula. First, under experimental conditions, multiple sets of known required evaporation temperatures, regional temperatures of air-conditioned areas, loads of air-conditioned areas, and control cycles are collected for each indoor unit as temperature estimation training data. Then, the above empirical formula is used as the fitting model, where c i For example, the square sum of the errors between the actual observation value and the model prediction value is used as the objective function, and the fitting coefficient c is adjusted. i Minimize the objective function, perform an optimization algorithm (such as least squares or gradient descent) and find the fitting coefficient c that minimizes the objective function i , establish indoor unit and fitting coefficient c i One-to-one correspondence.

[0114] In one or more embodiments of the present application, a prediction model can also be built based on temperature estimation training data. Specifically, the following steps are included: pre-processing the temperature estimation training data, including data cleaning, missing value processing, outlier processing, etc., to ensure the accuracy and completeness of the data, and dividing it into data sets for training and evaluation according to a set ratio. Further, a regression model can be selected, such as linear regression, support vector machine regression, random forest regression or neural network, etc. The selected regression model is trained using the training data set, with the regional temperature, air-conditioning area load and control cycle as input features, and the required evaporation temperature as the target output. After the training is completed, the model is evaluated using the data set for evaluation, and the error index between the predicted result and the true value is calculated to evaluate the model performance. According to the evaluation results, the model is tuned and optimized until satisfactory model performance is obtained, and the trained model is used as the temperature estimation condition.

[0115] In one or more embodiments of the present application, the superheat estimating unit 203 is configured to obtain the regional temperature of the air-conditioning area corresponding to the indoor unit, and generate a target superheat of each indoor unit in operation based on the superheat estimating condition established according to the regional temperature and the minimum value of the required evaporating temperature of the indoor unit in operation estimated by the temperature estimating unit 202, such as Figure 10 As shown in step S41 and step S42.

[0116] In one or more embodiments of the present application, the superheat estimation condition may be a data relationship table, a control algorithm, or an empirical formula.

[0117] In one or more embodiments of the present application, the superheat estimation condition may be a prediction model.

[0118] In one or more embodiments of the present application, the superheat estimation condition may be generated by the generation unit 206 .

[0119] The superheat estimating unit 203 is configured to obtain the zone temperature of the air-conditioning zone corresponding to the indoor unit, and generate a target superheat for each indoor unit in operation based on the superheat estimating condition established according to the zone temperature, the minimum value of the required evaporating temperature of the indoor unit in operation estimated by the temperature estimating unit 202, and the superheat correction coefficient, such as Figure 11 As shown in step S51 and step S52.

[0120] In one or more embodiments of the present application, the superheat estimation condition is the following empirical formula:

[0121] SH o_i =α i ×(T i_i -T losys ), i=1,...,n

[0122] Among them, SH o_i is the target superheat, α i is the superheat correction coefficient, T i_i is the regional temperature of the air-conditioning area, that is, the return air temperature of each indoor unit in operation, T losys is the minimum value of the required evaporation temperature, that is In one or more embodiments of the present application, T losys It can be considered as the target evaporating temperature of the air conditioning system. In one or more embodiments of the present application, the superheat estimating unit 203 can set the target superheat of the indoor unit estimated to have the lowest required evaporating temperature to 0°C. Specifically, the indoor unit with the lowest required evaporating temperature has been set to the lowest value in the system by the temperature estimating unit 202. The superheat is generally calculated by the difference between the required evaporating temperature and the actual evaporating temperature. A superheat of 0°C indicates that the temperature of the refrigerant in the evaporator is equal to or very close to the saturated evaporating temperature, which helps ensure that during the initial operation stage, the indoor unit estimated to have the lowest required evaporating temperature can operate with ideal cooling.

[0123] In one or more embodiments of the present application, the superheat correction coefficient α can be obtained by a fitting algorithm. i .

[0124] In one or more embodiments of the present application, the superheat correction coefficient is generated based on the proportional relationship between the actual required capacity of the indoor unit and the capacity threshold. iRepresents the proportional relationship between the actual required capacity of the indoor unit and the capacity threshold, that is:

[0125]

[0126] β i Reflects the relationship between the actual demand capacity of the indoor unit and the theoretical maximum capacity, the superheat correction coefficient α i The choice depends on β i , for example with β i Inversely proportional relationship, β i The larger the α i If the actual demand of the indoor unit is close to or exceeds the theoretical maximum capacity, the superheat correction factor α i , the target superheat will be correspondingly smaller. In other words, a smaller target superheat allows the corresponding indoor unit to exert greater cooling capacity, bringing the actual evaporation temperature closer to the saturation temperature and providing a greater cooling effect. Conversely, a larger target subcooling allows the system to responsively adjust the cooling capacity of the indoor unit to meet actual demand.

[0127] In one or more embodiments of the present application, the opening estimation unit 204 is configured to obtain the target superheat estimated by the superheat estimation unit 203 and the opening estimation condition determined based on the target superheat, the set superheat threshold and the performance parameters of the indoor electronic expansion valve, and generate the corresponding initial opening of each indoor electronic expansion valve, such as Figure 12 As shown in steps S61 and S62.

[0128] In one or more embodiments of the present application, the opening estimation condition may be a data relationship table, a control algorithm, or an empirical formula.

[0129] In one or more embodiments of the present application, the opening estimation condition may be a prediction model.

[0130] In one or more embodiments of the present application, the opening estimation condition may be generated by the generation unit 206 .

[0131] In one or more embodiments of the present application, the opening estimation condition is the following empirical formula:

[0132] EVI i =(SH o_max -SH o_i ) / SH o_max ×[d i +e i ×(EVI max -EVI min )], i = 1, ..., n

[0133] Where, EVIi is the initial opening of the indoor electronic expansion valve corresponding to each indoor unit, SH o_max is the theoretical maximum superheat of each indoor unit, d i 、e i EVI is the performance coefficient of the indoor electronic expansion valve corresponding to each indoor unit. max and EVI min They are the maximum opening and minimum opening of the electronic expansion valve corresponding to each indoor unit.

[0134] In one or more embodiments of the present application, the performance coefficient d of the indoor electronic expansion valve corresponding to each indoor unit is i 、e i It can be obtained through fitting. It can also be obtained under experimental conditions and stored as a set value and can be called at any time.

[0135] In the above formula, on the one hand, the theoretical maximum superheat, performance coefficient and maximum and minimum opening of each indoor unit are introduced, making the empirical formula more flexible, which can better adapt to the performance and characteristics of different indoor units, reflect the performance differences between different indoor units, and improve the overall performance of the system. In addition, by introducing the maximum opening and minimum opening, the opening range of the electronic expansion valve can be theoretically adjusted globally. The use of the theoretical maximum superheat takes into account the theoretical performance upper limit of each indoor unit, which helps to ensure the stability and adaptability of the system under different operating conditions.

[0136] In one or more embodiments of the present application, the air conditioning system may be configured to always perform the above control in the startup phase in the above manner.

[0137] In one or more embodiments of the present application, the air conditioning system may be configured to perform the above control during the startup phase in an environment with a large temperature difference and a small load.

[0138] like Figure 13 As shown, the processing device 200 further includes a condition estimation unit 207. The condition estimation unit 207 is configured to obtain the set temperature differences of the indoor units in the startup phase and the corresponding air-conditioning zone loads, and to estimate whether the set temperature difference of at least one indoor unit is higher than a reference temperature difference upper limit threshold, but the corresponding air-conditioning zone load is lower than a reference load lower limit threshold. The reference temperature difference upper limit threshold is used to determine whether the set temperature difference of the indoor unit is higher than an upper limit expected difference, and the reference load threshold is used to determine whether the air-conditioning zone load corresponding to the indoor unit is lower than a lower limit expected load.

[0139] In one or more embodiments of the present application, the load estimation unit 201 is configured to estimate the total load of the air-conditioning system when the set temperature difference of at least one indoor unit is higher than the reference temperature difference threshold, but the corresponding air-conditioning area load is lower than the reference load threshold, and estimate the initial operating frequency of the compressor based on the total load of the air-conditioning system.

[0140] Subsequently, the temperature estimation unit 202 further estimates the required evaporation temperature of each indoor unit in operation based on the load of the air-conditioning area. The superheat estimation unit 203 further estimates the target superheat of each indoor unit in operation based on the required evaporation temperature. The opening estimation unit 204 is configured to estimate the initial opening of each corresponding indoor electronic expansion valve based on the target superheat. The control unit 205 performs control in the startup phase based on the initial operating frequency and initial opening of the compressor; Figure 14 As shown in steps S71 to S76.

[0141] For example, when both indoor units are in a large temperature difference and low load environment (i.e., the set temperature difference is above the upper threshold of the reference temperature difference, but the corresponding air-conditioning zone load is below the lower threshold of the reference load), the processing device 200 calculates the initial compressor operating frequency, the required evaporating temperature for each operating indoor unit, the target superheat for each operating indoor unit, and the initial opening of each corresponding indoor electronic expansion valve. In this case, the compressor is adjusted based on the sum of the loads of all indoor units. For low-load environments, the initial compressor operating frequency is lower to ensure the air conditioning system's energy efficiency is within the ideal range. The opening of the corresponding indoor electronic expansion valve is adjusted based on the target superheat. This ensures that the initial opening of the indoor electronic expansion valve corresponding to the largest indoor unit is the largest among all operating indoor units, resulting in a superheat close to zero, allowing the indoor heat exchanger in this indoor unit to operate at near-maximum capacity. The opening of the indoor electronic expansion valve corresponding to the other indoor unit is calculated based on the required load, minimizing the utilization of the indoor heat exchanger. This can avoid frequent starting and stopping of the indoor unit, ensure that the indoor temperature fluctuates less, improve human comfort, and reduce the energy consumption of the air-conditioning system.

[0142] In one or more embodiments of the present application, the air conditioning system may be configured to perform the above control during the startup phase in an environment with a small temperature difference and a large load.

[0143] The condition estimation unit 207 is configured to obtain the set temperature difference of the indoor unit in the operating state during the startup phase, and the corresponding air-conditioning area load, and to estimate whether the set temperature difference of at least one indoor unit is lower than the lower limit threshold of the reference temperature difference, but the corresponding air-conditioning area load is higher than the upper limit threshold of the reference load; the lower limit threshold of the reference temperature difference is a benchmark for determining whether the set temperature difference of the indoor unit is lower than the lower limit expected difference, and the reference load threshold is a benchmark for determining whether the air-conditioning area load corresponding to the indoor unit is higher than the upper limit expected load.

[0144] In one or more embodiments of the present application, the load estimation unit 201 is configured to estimate the total load of the air-conditioning system when the set temperature difference of at least one indoor unit is lower than the lower limit threshold of the reference temperature difference, but the corresponding air-conditioning area load is higher than the upper limit threshold of the reference load, and estimate the initial operating frequency of the compressor based on the total load of the air-conditioning system.

[0145] Subsequently, the temperature estimation unit 202 further estimates the required evaporation temperature of each indoor unit in operation based on the load of the air-conditioning area. The superheat estimation unit 203 further estimates the target superheat of each indoor unit in operation based on the required evaporation temperature. The opening estimation unit 204 is configured to estimate the initial opening of each corresponding indoor electronic expansion valve based on the target superheat. The control unit 205 performs control in the startup phase based on the initial operating frequency and initial opening of the compressor; Figure 15 As shown in steps S81 to S86.

[0146] For example, when both indoor units are in a small temperature difference and high load environment (i.e., the set temperature difference is below the lower threshold of the reference temperature difference, but the corresponding air-conditioning zone load is above the upper threshold of the reference load), the processing device 200 calculates the initial compressor operating frequency, the required evaporation temperature of each operating indoor unit, the target superheat of each operating indoor unit, and the initial opening of each corresponding indoor electronic expansion valve. In this case, a relatively high initial compressor operating frequency is generated to increase the capacity of the indoor units and speed up the indoor temperature change. However, the corresponding indoor electronic expansion valve opening is adjusted based on the target superheat. The required superheat of the indoor unit with the highest load is close to 0, allowing it to operate at its maximum capacity. The other indoor unit calculates the indoor electronic expansion valve opening based on the load to adapt to the required load of the air-conditioned room. This achieves both increasing the room temperature change speed by operating the compressor at a higher frequency and preventing temperature fluctuations by using the initial opening.

[0147] In one or more embodiments of the present application, when the set temperature difference of at least one indoor unit is not higher than the upper limit threshold of the reference temperature difference, but the corresponding air-conditioning area load is lower than the lower limit threshold of the reference load, and when the set temperature difference of at least one indoor unit is not lower than the lower limit threshold of the reference temperature difference, but the corresponding air-conditioning area load is higher than the upper limit threshold of the reference load, a control algorithm in the prior art can be used for control, for example, based on static PID parameters.

[0148] For example, when one indoor unit is in a large temperature difference and small load environment, that is, the set temperature difference is higher than the upper limit threshold of the reference temperature difference, and the corresponding air-conditioning area load is lower than the lower limit threshold of the reference load, and the other indoor unit is in a small temperature difference and large load environment, that is, the set temperature difference is lower than the lower limit threshold of the reference temperature difference, and the corresponding air-conditioning area load is higher than the upper limit threshold of the reference load, the processing device 200 calculates the initial operating frequency of the compressor, the required evaporation temperature of each indoor unit in operation, the target superheat of each indoor unit in operation, and the initial opening of each corresponding indoor electronic expansion valve. At this time, a relatively high initial operating frequency of the compressor will be generated, and the target superheat of the indoor unit in the large load environment will be forcibly corrected to 0°C, and the initial opening will be calculated based on the target superheat of 0°C; the indoor unit in the small load environment can generate an initial opening according to the actual load to ensure that the temperature of the air-conditioning area where the indoor unit in the large load environment is located changes rapidly, and the temperature of the indoor unit in the small load environment remains stable, and the indoor unit will not start and stop frequently, thereby improving comfort.

[0149] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0150] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. Air conditioning system, including: At least one indoor unit, which is correspondingly provided with an indoor electronic expansion valve; and an outdoor unit fluidly connected to the indoor unit and having a compressor disposed therein; The air conditioning system can operate in cooling mode; It is characterized by further comprising: A processing device comprising: a load estimating unit configured to obtain the air-conditioning zone load corresponding to the indoor unit in the startup phase, estimate the total load of the air-conditioning system, and estimate the initial operating frequency of the compressor based on the total load of the air-conditioning system; a temperature estimating unit configured to estimate a required evaporating temperature of each indoor unit in operation based on the air conditioning area load; a superheat estimating unit configured to estimate a target superheat of each indoor unit in operation based on the required evaporating temperature; an opening degree estimating unit configured to estimate an initial opening degree of each corresponding indoor electronic expansion valve based on the target superheat degree; and The control unit is configured to perform control in a startup phase based on the initial operating frequency of the compressor and the initial opening degree.

2. The air conditioning system according to claim 1, characterized in that The load estimating unit is configured to obtain operating condition parameters of the compressor suction side and generate an initial operating frequency of the compressor based on a frequency estimation condition determined according to the compressor suction side parameters, compressor performance parameters and the total load of the air conditioning system.

3. The air conditioning system according to claim 2, characterized in that The processing device further includes: The generating unit is configured to generate the frequency estimation condition based on frequency estimation training data, wherein the frequency estimation training data includes a plurality of compressor operating frequencies, a plurality of air conditioning system total loads, a plurality of compressor suction pressures, a compressor suction volume, a compressor maximum suction pressure, and a compressor minimum suction pressure.

4. The air conditioning system according to claim 1, characterized in that The temperature estimating unit is configured to obtain the regional temperature of the air-conditioning area corresponding to the indoor unit, and generate the required evaporation temperature of each indoor unit in operation based on the temperature estimation condition established according to the regional temperature, the air-conditioning area load and the control cycle.

5. The air conditioning system according to claim 4, characterized in that The processing device further includes: The generating unit is configured to generate the temperature estimation condition based on temperature estimation training data, the temperature estimation training data including a plurality of required evaporating temperatures, a plurality of zone temperatures of air-conditioning zones, a plurality of air-conditioning zone loads, and a control period.

6. The air conditioning system according to claim 1, characterized in that The superheat estimating unit is configured to obtain a zone temperature of an air-conditioning zone corresponding to the indoor unit, and generate a target superheat for each indoor unit in operation based on a superheat estimating condition established according to the zone temperature and a minimum value of a required evaporating temperature of the indoor units in operation estimated by the temperature estimating unit.

7. The air conditioning system according to claim 1, characterized in that The superheat estimating unit is configured to obtain a zone temperature of an air-conditioning zone corresponding to each indoor unit, and generate a target superheat for each indoor unit in operation based on a superheat estimation condition established based on the zone temperature, a minimum value of the required evaporating temperatures of the indoor units in operation estimated by the temperature estimating unit, and a superheat correction coefficient. The superheat estimating unit may set the target superheat of the indoor unit estimated to have the minimum required evaporating temperature to zero. The superheat correction coefficient is generated based on the proportional relationship between the actual required capacity of the indoor unit and the capacity threshold.

8. The air conditioning system according to claim 1, characterized in that The opening degree estimating unit is configured to obtain the target superheat degree estimated by the superheat degree estimating unit, and generate an initial opening degree of each indoor electronic expansion valve based on an opening degree estimating condition determined based on the target superheat degree, a set superheat degree threshold value, and a performance parameter of the indoor electronic expansion valve.

9. Air conditioning system, including: Multiple indoor units, each corresponding to an indoor electronic expansion valve; an outdoor unit fluidly connected to the indoor unit and having a compressor disposed therein; The air conditioning system can operate in cooling mode; It is characterized by further comprising: A processing device comprising: a condition estimation unit configured to obtain the set temperature differences of the indoor units in the startup phase and the corresponding air-conditioning zone loads, and estimate whether the set temperature difference of at least one indoor unit is higher than a reference temperature difference upper limit threshold, but the corresponding air-conditioning zone load is lower than a reference load lower limit threshold; the reference temperature difference upper limit threshold is a benchmark for determining whether the set temperature difference of the indoor unit is higher than an upper limit expected difference, and the reference load threshold is a benchmark for determining whether the air-conditioning zone load corresponding to the indoor unit is lower than a lower limit expected load; a load estimating unit configured to estimate a total load of the air-conditioning system when a set temperature difference of at least one indoor unit is higher than a reference temperature difference threshold but a corresponding air-conditioning zone load is lower than a reference load threshold, and to estimate an initial operating frequency of the compressor based on the total load of the air-conditioning system; a temperature estimating unit configured to estimate a required evaporating temperature of each indoor unit in operation based on the air conditioning area load; a superheat estimating unit configured to estimate a target superheat of each indoor unit in operation based on the required evaporating temperature; an opening degree estimating unit configured to estimate an initial opening degree of each corresponding indoor electronic expansion valve based on the target superheat degree; and The control unit is configured to perform control in a startup phase based on the initial operating frequency of the compressor and the initial opening degree.

10. Air conditioning system, including: Multiple indoor units, each corresponding to an indoor electronic expansion valve; an outdoor unit fluidly connected to the indoor unit and having a compressor disposed therein; The air conditioning system can operate in cooling mode; It is characterized by further comprising: A processing device comprising: a condition estimation unit configured to obtain the set temperature differences of the indoor units in the startup phase and the corresponding air-conditioning zone loads, and estimate whether the set temperature difference of at least one indoor unit is lower than a lower limit threshold of a reference temperature difference, but the corresponding air-conditioning zone load is higher than an upper limit threshold of a reference load; the lower limit threshold of the reference temperature difference is a benchmark for determining whether the set temperature difference of the indoor unit is lower than a lower limit expected difference, and the reference load threshold is a benchmark for determining whether the air-conditioning zone load corresponding to the indoor unit is higher than an upper limit expected load; a load estimating unit configured to estimate a total load of the air-conditioning system when a set temperature difference of at least one indoor unit is higher than a reference temperature difference threshold but a corresponding air-conditioning zone load is lower than a reference load threshold, and to estimate an initial operating frequency of the compressor based on the total load of the air-conditioning system; a temperature estimating unit configured to estimate a required evaporating temperature of each indoor unit in operation based on the air conditioning area load; a superheat estimating unit configured to estimate a target superheat of each indoor unit in operation based on the required evaporating temperature; an opening degree estimating unit configured to estimate an initial opening degree of each corresponding indoor electronic expansion valve based on the target superheat degree; and The control unit is configured to perform control in a startup phase based on the initial operating frequency of the compressor and the initial opening degree.

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