Air supply pressure adjusting method based on multi-split air conditioner and related equipment

Abstract

The invention relates to the technical field of multi-split air conditioners, in particular to an air supply pressure adjusting method based on a multi-split air conditioner and related equipment. The multi-split air conditioner comprises a compressor, a four-way valve, an external unit coil pipe, an oil separator, an economizer, an economizer expansion valve, a main board cooler, a liquid pipe stop valve and a sensor module, the economizer is arranged between the main board cooler and the liquid pipe stop valve, a flow path of the economizer is divided into a main path and a branch path, the main path is connected with the main board cooler, and the branch path is connected with the external unit coil pipe. The branch is arranged between connecting pipelines of the economizer and the liquid pipe stop valve and connected with the economizer expansion valve and the economizer. The adjusting method comprises the steps that sensing data obtained by the sensor module are calculated, and air supply pressure is obtained; and refrigerant adjustment is conducted on the economizer to the compressor according to the air supply pressure, and the stable state of the air supply opening of the compressor is obtained. The air supply pressure can be accurately regulated and controlled, the adaptability to the frigid zone is improved, and the energy efficiency is balanced while safety is ensured.

Description

Technical Field

[0001] This application relates to the field of multi-split air conditioning technology, and in particular to a method and related equipment for adjusting the replenishment pressure of a multi-split air conditioner. Background Technology

[0002] Currently, gas injection enthalpy enhancement technology has become a core optimization solution for air conditioning heating (especially in cold regions and low-temperature heating scenarios). Its advantages lie in improved low-temperature performance, optimized energy efficiency, enhanced system stability, and compressor protection. However, in cold regions, the core challenges of using economizers for gas injection in multi-split systems are: firstly, parameter mismatch caused by extreme low temperatures; secondly, system fluctuations caused by frequent frosting; and thirdly, the challenge of balancing safety and energy efficiency. The core disadvantages of gas injection in cold regions are low precision in gas injection pressure control, significant frosting interference, poor low-temperature reliability, and difficulty in balancing energy efficiency. For example, the traditional strategy of fixing the gas injection pressure cannot adapt to the dynamic changes in the equivalent evaporation pressure of the indoor unit in cold regions, easily leading to uncontrolled compression ratio or insufficient heating capacity; traditional independent control of defrosting and gas injection can easily lead to sudden changes in gas injection parameters before and after defrosting, causing system oscillations; and the gas injection effect is insufficient at extreme low temperatures, resulting in limited improvement in heating capacity.

[0003] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the Invention

[0004] The main objective of this application is to propose a method and related equipment for adjusting the gas supply pressure of a multi-split air conditioner, which can achieve precise control of the gas supply pressure, improve adaptability to cold regions, and balance energy efficiency while ensuring safety.

[0005] To achieve the above objectives, one aspect of this application proposes a method for adjusting the replenishment pressure of a multi-split air conditioner. The multi-split air conditioner includes a compressor, a four-way valve, an outdoor unit coil, an oil separator, an economizer, an economizer expansion valve, a mainboard cooler, a liquid line shut-off valve, and a sensor module. The compressor is connected to one end of the oil separator, and the four-way valve is connected to both the outdoor unit coil and the other end of the oil separator. The economizer is located between the mainboard cooler and the liquid line shut-off valve. The economizer's flow path is divided into a main path and branch paths. The main path is connected to the mainboard cooler, and the branch paths are located between the connecting pipes of the economizer and the liquid line shut-off valve, and are connected to both the economizer expansion valve and the economizer. The adjustment method includes the following steps:

[0006] The air replenishment pressure is obtained by calculating the sensing data acquired by the sensor module. The refrigerant is adjusted by the economizer according to the gas supply pressure to the compressor, thereby achieving a stable state at the compressor gas supply port.

[0007] In some embodiments, calculating the replenishment pressure from the sensing data acquired by the sensor module includes the following steps: The sensor module is used to obtain the condensing pressure, the evaporation pressure of a single indoor unit, and the load of a single indoor unit. The equivalent evaporation pressure is calculated based on the evaporation pressure of the single indoor unit and the load of the single indoor unit. The equivalent evaporation pressure and the condensation pressure are calculated to obtain the theoretical value of the make-up gas pressure; The theoretical value of the replenishment pressure is corrected to obtain the replenishment pressure.

[0008] In some embodiments, the calculation based on the evaporation pressure of the single indoor unit and the load of the single indoor unit includes the following formula: ; in, This represents the equivalent evaporation pressure. This indicates the load of the single indoor unit. The value represents the evaporation pressure of the single indoor unit, and k represents the number of indoor units in operation.

[0009] In some embodiments, the calculation of the equivalent evaporation pressure and the condensation pressure includes the following formulas: ; in, This represents the theoretical value of the air replenishment pressure. This indicates the condensation pressure. This represents the equivalent evaporation pressure.

[0010] In some embodiments, correcting the theoretical value of the replenishment pressure to obtain the replenishment pressure includes the following steps: The main subcooling is obtained by calculating the saturation temperature of the condensing pressure and the outlet temperature of the outdoor unit coil. The undercooling correction value is obtained by comparing the main road undercooling degree with the main road undercooling correction coefficient. The motherboard temperature correction value is obtained by comparing the motherboard temperature with the motherboard temperature correction factor. The gas supply pressure is calculated based on the supercooling correction value, the motherboard temperature correction value, and the theoretical value of the gas supply pressure.

[0011] In some embodiments, the following steps are also included: When the replenishment pressure is less than the minimum safety threshold, the replenishment pressure is corrected according to the pressure value of the minimum safety threshold to obtain the corrected replenishment pressure; The flash gas saturation temperature is obtained by comparing the corrected gas supply pressure with the physical property table. When the saturation temperature of the flash gas is greater than or equal to the first minimum evaporation temperature threshold, the verified replenishment pressure is obtained; When the outdoor ambient temperature is less than or equal to the low temperature threshold and the duration exceeds the maximum time threshold, the gas replenishment pressure is the minimum safety threshold, and the flash gas saturation temperature is greater than or equal to the second minimum evaporation temperature threshold. The minimum safety threshold is dynamically adjusted based on the outdoor ambient temperature and the cold-climate control parameter library.

[0012] In some embodiments, adjusting the refrigerant supply to the compressor based on the refrigerant pressure to achieve a stable state at the compressor's refrigerant inlet includes the following steps: The opening of the economizer expansion valve is adjusted according to the replenishment pressure to obtain the real-time flash gas saturation temperature. When the real-time flash gas saturation temperature is within the evaporation temperature threshold range, it is determined whether the gas replenishment pressure is within the safe threshold range. When the gas replenishment pressure is within the safety threshold range, it is determined whether the defrosting temperature sensing bulb temperature is less than the frosting point temperature, the relative humidity is greater than or equal to the humidity threshold, and the duration of the condition is greater than the preset time threshold. If all conditions are met, defrosting is performed; otherwise, the equivalent evaporation pressure is updated and calculated in real time. When the real-time flash gas saturation temperature is less than the minimum value of the evaporation temperature threshold range, the replenishment pressure is increased according to the first pressure value; when the real-time flash gas saturation temperature is greater than the maximum value of the evaporation temperature threshold range, the replenishment pressure is decreased according to the second pressure value; it is determined whether the adjusted replenishment pressure is within the safe threshold range. If it is not satisfied, the replenishment pressure is corrected to the safe threshold range by taking the nearest value.

[0013] In some embodiments, before performing calculations on the sensing data acquired by the sensor module, the following steps are further included: The multi-split air conditioner performs a power-on self-test to determine whether the outdoor ambient temperature is less than or equal to the first low temperature threshold, or whether the cold-zone control mode is manually activated and the outdoor ambient temperature is less than or equal to the second low temperature threshold. When any condition is met, the cold-region control parameter library is loaded, and the spare parameters in the cold-region control parameter library are obtained. The backup parameters are verified and screened by pressure parameters, load or temperature parameters and cold-weather control status parameters, and the indoor unit operating status is screened to obtain accurate backup parameters; The backup parameters include the minimum safety threshold, the main circuit undercooling correction factor, the first minimum evaporation temperature threshold, the second minimum evaporation temperature threshold, and the motherboard temperature correction factor.

[0014] To achieve the above objectives, another aspect of this application proposes a gas supply pressure regulation system based on a multi-split air conditioner. The multi-split air conditioner includes a compressor, a four-way valve, an outdoor unit coil, an oil separator, an economizer, an economizer expansion valve, a main board cooler, a liquid line shut-off valve, and a sensor module. The compressor is connected to one end of the oil separator, and the four-way valve is connected to both the outdoor unit coil and the other end of the oil separator. The economizer is located between the main board cooler and the liquid line shut-off valve. The economizer's flow path is divided into a main path and branch paths. The main path is connected to the main board cooler, and the branch paths are located between the connecting pipes of the economizer and the liquid line shut-off valve, and are connected to both the economizer expansion valve and the economizer. The regulation system includes the following steps: The calculation module is used to calculate the air replenishment pressure by processing the sensor data acquired by the sensor module. The regulating module is used to regulate the refrigerant supply from the economizer to the compressor based on the gas supply pressure, so as to obtain a stable state at the compressor gas supply port.

[0015] To achieve the above objectives, another aspect of this application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the method described above.

[0016] The embodiments of this application include at least the following beneficial effects: This application provides a method and related equipment for adjusting the replenishment pressure of a multi-split air conditioner. This solution calculates the replenishment pressure using sensor data from a sensor module, and then adjusts the refrigerant supply to the compressor via the economizer, keeping the compressor's replenishment port stable. This effectively improves the compressor's working efficiency and operational stability, reducing compressor overload or energy waste caused by abnormal replenishment pressure. The reasonable connection between the economizer, outdoor unit coils, and expansion valve, along with the parallel cooling of the main board, ensures smooth refrigerant flow and stable subcooling, preventing premature refrigerant flashover. Combined with the liquid-gas manifold and shut-off valve, it achieves efficient connection between the indoor and outdoor units, resulting in better cooling and heating capabilities and lower energy consumption. The embodiments of this application protect the compressor from damage such as liquid slugging, extending its service life, while also improving the overall operational reliability and temperature control accuracy, adapting to the complex operating conditions of multiple indoor units working together in a multi-split air conditioner. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the multi-split air conditioner provided in the embodiments of this application; Figure 2This is a flowchart of a method for adjusting the air supply pressure of a multi-split air conditioner; Figure 3 yes Figure 2 The flowchart of step S210 in the middle; Figure 4 This is a schematic diagram of the gas replenishment pressure control process; Figure 5 This is a schematic diagram of the process for determining the air replenishment pressure before calculation; Figure 6 This is a schematic diagram of the structure of the gas supply pressure regulation system based on a multi-split air conditioner provided in the embodiments of this application; Figure 7 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0019] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if,” “when,” or “in response to a determination” as used herein may be interpreted as “when…” or “when…” or “in response to a determination.”

[0020] As used in this application, the terms "at least one", "multiple", "each", "any", etc., "at least one" includes one, two or more, "multiple" includes two or more, "each" refers to each of the corresponding multiples, and "any" refers to any one of the multiples.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0022] Before providing a detailed description of the embodiments of this application, some of the nouns and terms involved in the embodiments of this application will be explained first. The nouns and terms involved in the embodiments of this application are subject to the following interpretations.

[0023] Sensor module: The core data acquisition component of the multi-split air conditioner, which collects key parameters such as ambient temperature, condensing pressure, evaporating pressure, mainboard temperature, and subcooling in real time, providing accurate data support for cold-weather mode gas injection pressure calculation, operating condition determination, defrosting triggering, etc., and ensuring accurate parameter preprocessing and correction calculation.

[0024] Pressure at the inner coil: This refers to the pressure of the evaporator coil in the indoor unit, which corresponds to the evaporation pressure of the indoor unit. It is necessary to filter out abnormal values ​​caused by frost and include them in the calculation of the equivalent evaporation pressure. In cold weather conditions, it is necessary to adjust and adapt to the low temperature load, which directly affects the accuracy of the theoretical value of the gas supply pressure.

[0025] External coil pressure: This refers to the pressure of the outdoor unit coil, which corresponds to the condensing pressure. It needs to be filtered by the sliding average to remove gust fluctuations. It is the core calculation parameter for the theoretical value of the gas supply pressure and needs to be increased under defrosting conditions to meet the heating needs of cold regions.

[0026] Gas supply pressure: The theoretical value is calculated based on condensation and equivalent evaporation pressure, and is superimposed with subcooling, main board temperature correction and nighttime weighting. It is rigidly constrained by the minimum safety threshold, and has specific values ​​for cold wave and defrosting conditions to ensure compressor safety and system stability.

[0027] In related technologies, when multi-split air conditioners are used in cold regions, the adaptability of the control system to ultra-low temperature operating conditions directly determines the product's safety and energy efficiency. By utilizing the economizer to increase enthalpy through gas injection, achieving precise control of the gas injection pressure is the core solution to the adaptability issue, significantly improving low-temperature heating capacity and optimizing system energy efficiency. It also protects the compressor, extends system lifespan, and enhances system operational stability.

[0028] In view of this, this application provides a method for adjusting the replenishment pressure of a multi-split air conditioner. This method is optimized from the perspective of control method to improve control accuracy and solve the problem of mismatch between replenishment pressure and operating conditions.

[0029] like Figure 1 As shown, Figure 1This is a schematic diagram of the structure of a multi-split air conditioner provided in the embodiments of this application. The diagram shows a multi-split system that includes an outdoor unit and multiple indoor units. Specifically, inside the outdoor unit, the outlet of the core component compressor 111 is connected to the oil separator 113, and the outlet of the oil separator is connected to one port of the four-way valve 114; the other port of the four-way valve is connected to the inlet of the outdoor unit coil 115, and the outdoor unit fan 116 is equipped next to the outdoor unit coil. Its outlet is divided into two paths, one of which is connected to the outdoor unit electronic expansion valve 117, and the other is connected to the subcooling solenoid valve 123; the outlet of the outdoor unit electronic expansion valve 117 is connected in parallel to the main board cooling component 122, and then connected to the liquid pipe shut-off valve 118; the outlet of the subcooling solenoid valve 123 is connected to one side of the economizer 120 (plate heat exchanger), and the other side of the economizer is connected to the economizer expansion valve 121, and the outlet of the economizer expansion valve is connected to the gas-liquid separator 112; at the same time, the gas-liquid separator is also connected to the side port of the four-way valve 114 through the enthalpy-increasing solenoid valve 124; the remaining port of the four-way valve is connected to the gas pipe shut-off valve 119, and the outlet of the gas-liquid separator is finally connected back to the inlet of the compressor 111. In the connection between the indoor and outdoor units, the liquid pipe shut-off valve 118 of the outdoor unit is connected to the liquid pipe branch pipe 125, which then branches to the indoor unit shut-off valve 127 of each indoor unit; the outlet of each indoor unit is connected to the gas pipe branch pipe 126, which finally connects back to the gas pipe shut-off valve 119 of the outdoor unit; each indoor unit is also equipped with an indoor unit liquid pipe temperature sensor 128 and an indoor unit gas pipe temperature sensor 129 in the sensor module for monitoring the refrigerant temperature.

[0030] In heating mode, the refrigerant flow path is as follows: When the compressor is working, it compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. First, it is sent to the oil separator to separate the lubricating oil mixed in with the refrigerant (the lubricating oil will flow back to the compressor). The separated high-temperature, high-pressure gaseous refrigerant enters the four-way valve. Since it is currently in heating mode, the four-way valve switches its flow direction. The high-temperature, high-pressure refrigerant flows through the gas pipe shut-off valve and the branch pipe, leading to the indoor unit evaporator. At this time, the evaporator actually acts as the condenser, and the heat dissipation of the inner coil raises the indoor air temperature. Then, it enters the outdoor unit through the liquid line, reaching the economizer where it splits into a main circuit and a branch circuit. The main circuit refrigerant is first used for heat dissipation on the main board, then throttled by the outdoor unit's electronic expansion valve and flows to the condenser. At this time, the condenser actually acts as the evaporator, absorbing outdoor heat, and the refrigerant becomes a low-temperature, low-pressure state. The branch circuit refrigerant is first throttled by the economizer's expansion valve, flowing to the economizer to cool the main circuit refrigerant, and then to the gas separator inlet or to replenish the compressor and increase its enthalpy. After the low-temperature, low-pressure refrigerant flows out of the condenser, it passes through a four-way valve and flows to the gas-liquid separator, where it is finally drawn back into the compressor, completing the entire heating cycle. The enthalpy-increasing solenoid valve is typically opened under extreme heating conditions, such as extremely low outdoor temperatures, to supplement the refrigerant flow and enhance the compressor's heating capacity.

[0031] The embodiments in this application are based on the heating mode under ultra-low temperature conditions. Figure 1The arrows marked in the middle indicate the direction of refrigerant flow during heating. Figure 1 In cooling mode, the outdoor unit uses a gas inlet and a liquid outlet; in heating mode, it uses a liquid inlet and a gas outlet. The economizer (plate heat exchanger) includes an expansion valve, mains cooling, subcooling solenoid valve, and enthalpy-increasing solenoid valve. These components enable the system to replenish gas and increase enthalpy, subcool the main refrigerant, and cool the mains. For example, in heating mode, the economizer expansion valve throttles a portion of the refrigerant to the branch circuit, exchanging heat with the main refrigerant and subcooling it. The main refrigerant then cools the mains, and the branch refrigerant flows to the gas distributor inlet or replenishes gas and increases enthalpy for the compressor.

[0032] Figure 2 This is an optional flowchart of the method for adjusting the replenishment pressure of a multi-split air conditioner provided in the embodiments of this application. Figure 2 The method may include, but is not limited to, steps S210 to S220.

[0033] Step S210: Calculate the sensing data acquired by the sensor module to obtain the replenishment pressure; Step S220: Adjust the refrigerant supply to the compressor according to the gas supply pressure to obtain a stable state at the compressor gas supply port.

[0034] In steps S210 to S220 of the embodiments of this application, the corresponding sensing data is collected by the sensor module and processed to accurately obtain the gas supply pressure. Based on the gas supply pressure, the refrigerant passage between the economizer and the compressor is adjusted. By controlling the opening of the economizer expansion valve and coordinating with the heat exchange effect of the economizer, the state and flow rate of the gas supply refrigerant are changed, so that the refrigerant pressure and flow rate delivered by the economizer to the compressor gas supply port are stably matched to the compressor's operating requirements, and finally the compressor gas supply port reaches a stable state with stable pressure and suitable refrigerant supply.

[0035] In some embodiments, Figure 3 yes Figure 2 The flowchart of step S210 is as follows. Figure 3 The method may include, but is not limited to, steps S211 to S214: Step S211: Obtain the condensing pressure, single indoor unit evaporation pressure, and single indoor unit load through the sensor module; Step S212: Calculate the equivalent evaporation pressure based on the evaporation pressure and load of the single indoor unit; Step S213: Calculate the equivalent evaporation pressure and condensation pressure to obtain the theoretical value of the make-up gas pressure; Step S214: Correct the theoretical value of the air replenishment pressure to obtain the air replenishment pressure.

[0036] Specifically, in step S211, the core parameter definitions are first clarified: The adjusted air supply pressure is also called the intermediate pressure; Pe is the indoor unit evaporation pressure. The equivalent evaporation pressure is calculated using a weighted average to reflect the overall evaporation pressure level of the system during cooling, while the actual pressure during heating is the condensing pressure. To distinguish between the indoor and outdoor unit coil pressures, the names are still based on the cooling mode. Evaporation pressure refers to the pressure at the indoor coil, and condensing pressure refers to the pressure at the outdoor coil. The key difference between multi-split systems and single-split systems is that multiple indoor units can operate independently. The evaporation pressure will vary with the load differences of the indoor units. For example, under cooling conditions, the Pe of a high-load indoor unit is higher, while the Pe of a low-load or shut-down indoor unit is lower. If the Pe of a single indoor unit is used directly for calculation... This will cause an imbalance in the compression ratio, so the equivalent evaporation pressure needs to be calculated first. Furthermore, the load percentage of each indoor unit is used as the weight to accurately reflect the overall evaporation pressure level of the system; data collection is performed before adjustment, and three core data of the multi-split system are collected in real time, including condensing pressure. The condenser outlet pressure sensor in the sensor module collects and reflects the system's condenser-side pressure, and simultaneously determines... The upper limit is the single indoor unit evaporation pressure. The pressure is collected by the inlet or outlet pressure sensors of the electronic expansion valves of each indoor unit in the sensor module, corresponding to the evaporation pressure of a single indoor unit (i=1,2…n, where n is the number of indoor units), and the load of a single indoor unit. The return air temperature data obtained by the return air temperature sensor in the sensor module is compared with the set temperature difference to calculate the equivalent evaporation pressure weight. This serves as the core basis for calculating the weight of the equivalent evaporation pressure. The larger the load, the greater the effect. The stronger the impact.

[0037] In step S212, the equivalent evaporation pressure of the multi-split system is determined by the load percentage of the indoor units during operation, but when the indoor units are shut down, the load... When the value is 0, it is not included in the calculation. The formula for calculating the equivalent evaporation pressure is: ; in, Indicates the equivalent evaporation pressure. This represents the real-time load (kW) of the i-th operating indoor unit. This represents the real-time evaporation pressure (MPa) of the i-th operating indoor unit, and k represents the number of indoor units in operation (k is less than or equal to n).

[0038] In step S213, the replenishment pressure The core function is to break down the single-stage compression of the compressor into low-pressure stages ( ) and high voltage level ( By achieving approximately equal compression ratios in two stages, exhaust temperature is reduced and power consumption is optimized. Taking typical operating conditions as an example, without considering factors such as diurnal temperature fluctuations, optimized subcooling, and ensuring motherboard cooling, the injection pressure... This can be considered equal to the theoretical value Pm0, and the derived calculation formula is: ; in, This represents the theoretical value of the replenishment pressure. Indicates condensation pressure, This represents the equivalent evaporation pressure.

[0039] In step S214, when applying the frigid zone control model in frigid regions, other factors need to be considered to further correct the theoretical value of the gas replenishment pressure. The process for obtaining the calculated gas replenishment pressure in the frigid zone control model is as follows: load the frigid zone control parameter library (obtain parameters such as safety thresholds and correction coefficients). Collect real-time data The data before calculation is determined and filtered based on "pressure parameters, temperature parameters, cold-climate-specific state parameters, and operating status". Calculate the equivalent evaporation pressure Theoretical value of replenishment pressure The corrected air supply pressure is calculated based on the correction factor. .

[0040] Under cold-climate control mode, the acquisition of gas replenishment pressure must adhere to a rigid safety threshold constraint, which cannot be exceeded. The core safety standard is specific to cold-climate regions. The minimum safety threshold is preferably... =0.78MPa, this pressure corresponds to the POE32 viscosity of R410A lubricating oil. 500 cSt, and also need to meet the flash gas saturation temperature Tfe The first minimum evaporation temperature threshold is preferably 6°C, and this temperature is determined by... It is derived from saturation temperature, and the error is allowed. The verified gas supply pressure was obtained at 0.5℃; defrosting triggering requires meeting three conditions, namely the temperature of the defrosting sensing bulb. Frost point temperature and relative humidity 60%, and defrosting can only be initiated after the combined conditions have been running continuously for 20 minutes.

[0041] The calculation of the replenishment pressure requires the use of dynamic correction coefficients based on different operating conditions. These mainly include two types: subcooling correction values ​​and motherboard temperature correction values, both expressed in MPa. Subcooling correction values... Based on the main circuit subcooling degree Sc, the preferred value is when Sc... At 6℃ -0.03 is used to increase flash volume and improve supercooling; at 6℃ Sc At 9℃ Set to 0 to maintain the theoretical value and balance the system's operating requirements; when Sc At 9℃ Add +0.03 to reduce flashover and lower system power consumption. Motherboard temperature correction value. The value is determined based on the motherboard temperature Tigbt. At 80℃ Add -0.03 to enhance motherboard cooling; at 72℃ Tigbt At 80℃ Set it to 0 to maintain the theoretical value and balance the operating requirements; when Tigbt At 72℃ Add +0.02 to optimize energy consumption in the gas replenishment process; simultaneously, load weighting is required during the coldest operating period from 18:00 to 6:00 the next day to reserve pressure redundancy in case of sensor drift and sudden load drop. The weighting method is to use the final calculated gas replenishment pressure Multiply by 1.1.

[0042] The calculation of the gas injection pressure requires processing the core pressure parameters first to avoid interference from fluctuations and frost formation. One such parameter is the condensation pressure. The preferred method is to use a 5-second moving average to calculate and filter out wind-induced gusts. The pressure fluctuation is 0.1 MPa, ensuring stable pressure values; secondly, the indoor unit evaporation pressure. Filtering required An abnormal frosting value of 0.2 MPa should be replaced with the average value over the past 30 seconds to ensure parameter validity. It is also necessary to adapt to the low-temperature characteristics of cold regions, handling load and temperature parameters, and the load of each indoor unit. Compensation is needed for low-temperature load fluctuations, when the ambient temperature is -20℃. Multiply by 1.1, at an ambient temperature of -15℃ Multiply by 1.05; if the motherboard temperature (Tigbt) flashes, the gas saturation temperature (Tfe) drops sharply. The value of 2℃ / second is considered a frosting interference, and the current Tigbt value should be replaced with a 3-second average. The main circuit subcooling Sc is calculated using the formula Sc=Tcs-Tco, where Tcs is the condensing pressure. The corresponding saturation temperature, Tco, is the condenser outlet temperature.

[0043] In cold-weather mode, specific state parameter requirements must be followed. For cold wave emergency handling, when the outdoor ambient temperature is less than or equal to the low-temperature threshold and the duration exceeds the maximum time threshold, preferably when the ambient temperature T4 ≤ -22℃ and lasts for more than 1 hour, the theoretical value and correction calculation steps for the replenishment pressure are skipped. The lowest safety threshold is directly selected, preferably 0.78 MPa, which yields the corrected gas injection pressure. The flash gas saturation temperature Tfe is allowed to briefly drop to 5.5-6℃, which is the second lowest evaporation temperature threshold, reserving a safety margin. During defrosting, the condensing pressure needs to be... The pressure rises to 2.2~2.5 MPa, equivalent evaporation pressure. Set the indoor static pressure to 1.0 MPa, and simultaneously suspend the correction related to the flash gas saturation temperature Tfe; after defrosting, set the replenishment pressure... Recovery should be done in stages, following the "pre-defrost baseline values". 0.83MPa The order of the "target range" is adjusted by 0.03 MPa every 30 seconds to avoid equivalent evaporation pressure. Instability causes fluctuations in the compressor's compression ratio.

[0044] Before calculating the gas replenishment pressure, the operating status of the indoor units of the multi-split air conditioning system needs to be screened to identify those not included in the equivalent evaporation pressure calculation. The calculated indoor unit operating conditions include, firstly, when the indoor unit is stopped, or when the fan or valve malfunctions, the load on the indoor unit. The value is directly set to 0; secondly, the indoor unit's evaporation pressure Pei fluctuates during the frosting period. At 0.05 MPa / s, the average value over the past 30 seconds is used instead and is not included in real-time calculations; thirdly, indoor units that are temporarily on standby during defrosting must be reintegrated 30 seconds after defrosting is complete. The calculation range ensures the accuracy of the equivalent evaporation pressure.

[0045] The calculation of the gas replenishment pressure under the cold-climate model consists of two steps: theoretical value calculation and correction calculation. First, the theoretical value of the gas replenishment pressure, Pm0, is calculated using the following formula: ,in To ensure stable operating pressure at the condenser outlet after treatment, it is necessary to eliminate instantaneous fluctuations caused by fan start-up and shutdown and indoor unit switching. Alternatively, a 10-second average value can be selected to guarantee stability. The equivalent evaporation pressure is calculated after filtering and correcting the parameters of the indoor unit as described above; then, a correction calculation is performed based on the theoretical value to arrive at the final gas replenishment pressure. That is, the theoretical value of the air supply pressure is superimposed with the subcooling correction value and the motherboard temperature correction value, and through multiple corrections, it allows... It satisfies the compressor's compression ratio balance requirements while also taking into account the main circuit subcooling improvement and mainboard cooling effect, making it suitable for cold-climate low-temperature operating conditions.

[0046] Based on the above, for example, under cold-climate heating conditions, R410A refrigerant and POE32 compressor lubricating oil are used. The operating conditions are as follows: 21:00 in the winter of central Northeast China, which falls within the 18:00-6:00 nighttime period, with an outdoor ambient temperature T4 of -20℃, relative humidity of 65%, and defrosting conditions not triggered. The multi-split air conditioner has 3 indoor units, with 2 running and 1 indoor unit in the secondary bedroom shut down. =0 is not included in the calculation. The core fixed parameters are cold zone Pm-min=0.78MPa, Tfe≥6℃, and night load weighting coefficient=1.1.

[0047] First, basic data on stable conditions, frosting conditions, and sudden changes in temperature were collected and preprocessed, including condensation pressure. =1.88MPa, evaporating pressure of indoor unit 1 Pei1=0.248MPa, evaporating pressure of indoor unit 2 Pei2=0.229MPa, rated load of indoor unit 1 Qi1=3.0kW, rated load of indoor unit 2 Qi2=2.0kW, main circuit subcooling Sc=52-46=6℃, main board temperature Tigbt=75℃; then calculate the equivalent evaporating pressure. The calculation formula is based on the equivalent evaporation pressure: ; Combining the -20℃ load correction factor of 1.1, we can obtain: Peeq=(3.0×1.1×0.248+2.0×1.1×0.229) / (3.0×1.1+2.0×1.1)≈0.242MPa; then calculate the theoretical value of the make-up air pressure Pm0, according to the formula... Subsequently, a preliminary triple correction calculation was performed. Since Sc=6℃, a correction for supercooling is taken. =0MPa, Tigbt=75℃ (corrected for motherboard temperature) =0MPa, during nighttime periods, a weighting factor of 1.1 is required. The next step is to perform a mandatory correction of the safety threshold, due to 0.746 MPa. Pm-min=0.78MPa, triggering safety constraints and forcibly... The pressure was corrected to 0.78 MPa. Referring to the R410A property table, this pressure corresponds to a Tfe of 6°C, which meets the requirement of Tfe ≥ 6°C. Furthermore, the lubricating oil viscosity is 480 cSt ≤ 500 cSt, which is the safe upper limit. Therefore, the equivalent evaporation pressure was finally obtained. =0.242MPa, theoretical gas replenishment pressure =0.678MPa, corrected air supply pressure =0.78MPa, flash temperature Tfe=6℃. If a sudden cold wave occurs under this condition, and T4 drops sharply to -22℃ and lasts for 1.5 hours, then the emergency response rules for cold waves should be followed, and the procedure should be skipped. , Calculation, take directly =0.78MPa, while Tfe allows for a temporary drop to a safe redundancy range of 5.5℃.

[0048] In some embodiments, in step S220, such as Figure 4 As shown, the specific gas replenishment pressure control process is as follows: After the unit is powered on, the operating condition is first determined. After confirming that it is a cold-climate operating condition, the unit starts up and runs for 120 seconds according to the preset frequency and valve opening to complete the start-up phase; then, the condensing pressure is continuously read at 1 second intervals. Indoor unit evaporator pressure (Pei), load of each indoor unit The mainboard temperature (Tigbt) and main circuit subcooling (Sc) are monitored. If a user shutdown or unit malfunction is detected during operation, the unit will be immediately shut down. Otherwise, proceed to the next step. Then, the equivalent evaporation pressure is calculated every 3 seconds. Then, based on the condensing pressure and the equivalent evaporating pressure, the theoretical value of the make-up gas pressure Pm0 is calculated, followed by the subcooling correction value corresponding to the unit's subcooling requirement. Motherboard temperature correction value The Pm0 value is corrected, and a nighttime load weighting factor of 1.1 is added for the period from 18:00 to 6:00 the next day to calculate the final gas supply pressure. Then, based on the final replenishment pressure... Adjust the opening of the auxiliary throttle valve of the economizer, and simultaneously monitor the flash gas saturation temperature Tfe to obtain the real-time flash gas saturation temperature. Determine whether Tfe is within the preset range of 5.5-9.5℃ for cold-climate control. If it is within this range, determine whether the gas supply pressure is within the safe threshold range. If it is not within this range, make targeted adjustments to Tfe. At 5.5℃ Increase the first pressure value, preferably 0.03 MPa, Tfe At 9.5℃ Reduce the second pressure value, preferably to 0.03 MPa, and proceed to the next step after adjustment; then determine the adjusted pressure value. Whether it meets the preset safety threshold range of the cold-climate control parameter library, such as 0.78 to 0.83 MPa when the outdoor ambient temperature is -20 to -18℃, and 0.80 to 0.85 MPa when the ambient temperature is -18 to -12℃. If it meets the range, then maintain. If it does not conform, it will be forcibly changed. Adjust the value to a safe range and take the nearest value, while triggering an alarm. After completion, proceed to the next step. Finally, determine whether the unit meets the defrosting trigger condition, i.e., the temperature of the defrosting sensor. Frost point temperature and relative humidity If the condition of 60% is met and the unit continues to run for 20 minutes, it will enter the defrosting mode according to the preset parameters in the cold zone control parameter library. After defrosting, it will return to the step of reading parameters every second and run in a loop. If the condition is not met, it will be determined that the unit does not need to defrost and will directly return to the step of reading parameters every second, continuously executing the gas supply pressure control process in a loop, and finally obtaining a stable state of the compressor gas supply port.

[0049] In some embodiments, such as Figure 5 As shown, the pre-calculation determination process for replenishment pressure needs to be carried out step by step in conjunction with relevant parameters and operating conditions. Specifically: First, a power-on self-test is performed to determine the operating conditions. It is necessary to determine whether any of the following start-up conditions are met: First, the outdoor ambient temperature T4 ≤ the first temperature threshold, preferably -5℃, and this state lasts for 1 minute; second, the user manually activates the cold-weather control mode and the outdoor ambient temperature T4 ≤ the second temperature threshold, preferably 0℃. If either condition is met, it is determined to be the cold-weather control mode, and the cold-weather control parameter library is loaded simultaneously, proceeding to the subsequent determination steps; if neither condition is met, it is determined to be the normal control mode, and the normal control parameter library is loaded. This application embodiment does not provide a detailed explanation of normal control.

[0050] After the cold-climate control parameter library is loaded, the backup parameters in the library are read. The backup parameters include core parameters such as the minimum safety threshold, the main circuit subcooling correction factor, the first minimum evaporation temperature threshold, the second minimum evaporation temperature threshold, and the motherboard temperature correction factor. The core safety threshold needs to be carefully controlled and is specific to cold-climate applications. The minimum safety threshold Pm-min is the minimum limit for the system's gas injection pressure. If the injection pressure is lower than this threshold, the corresponding flash gas saturation temperature Tfe will decrease as the saturation temperature decreases, leading to the lubricating oil viscosity exceeding the safety threshold and causing oil film rupture, posing a fatal operational risk to the compressor. Simultaneously, the constraint of flash gas saturation temperature Tfe ≥ 6℃ must be followed. Pm-min corresponds to approximately 6℃, forming a rigid safety constraint through these dual conditions to eliminate potential safety hazards. Furthermore, the system also includes defrosting trigger conditions to accurately determine whether the unit needs to enter defrosting mode. The correction coefficients cover subcooling correction values, mainboard temperature correction values, and nighttime load weighting coefficients. All three are used for subsequent correction calculations of the theoretical injection pressure value Pm0. The core reasons for these corrections can be found in the corresponding content. After all parameters are read, the system starts real-time data acquisition.

[0051] After data acquisition, pressure parameters, load / temperature parameters, and parameters related to cold-climate control status must first be verified to ensure their validity. During the stable operation phase of the system, the core focus is on ensuring the accuracy of pressure and load / temperature parameter acquisition, which is crucial for subsequent Pm0 and final... Precise calculations lay a solid foundation, with pressure parameters needing to filter out fluctuations and load / temperature parameters needing to be adapted to the characteristics of frigid zones. The parameters related to frigid zone control states are particularly unique, as they are the core differentiator between frigid zone and conventional modes. For example, in cold wave emergency response scenarios, if the criteria of an ambient temperature T4 ≤ -22℃ for more than 1 hour are met, subsequent calculation steps such as equivalent evaporation pressure and theoretical values ​​of replenishment pressure can be skipped, and the replenishment pressure... The direct value is 0.78 MPa. During the defrosting process, the condensing pressure and equivalent evaporation pressure need to be adjusted and the Tfe correction needs to be paused. After defrosting, the gas replenishment pressure needs to be restored in a stepwise manner. By making targeted adjustments to the control parameters and control methods, it can be adapted to the special operating requirements of cold regions.

[0052] After completing the verification of various parameters, the indoor unit operation status screening stage begins, the core purpose of which is to determine the equivalent evaporation pressure. The calculation process eliminates invalid entries, improving accuracy. Clear screening criteria are used: units shut down or shut down due to fan or valve malfunctions are excluded, with their load counted as zero and excluded from calculation. Units experiencing excessive evaporative pressure fluctuations during frosting are replaced with stable average values ​​before calculation. Units temporarily on standby during defrosting are reintroduced 30 seconds after defrosting ends. This process thoroughly eliminates interference from invalid states such as shutdown, malfunction, frosting fluctuations, and defrosting standby, ensuring the load and pressure demand calculations more closely reflect actual operating conditions and yield accurate backup parameters. After indoor unit status screening, equivalent evaporative pressure calculations are performed sequentially. Theoretical value of replenishment pressure and final replenishment pressure The calculation.

[0053] Please see Figure 6 This application also provides a system for regulating the replenishment pressure of a multi-split air conditioner, which can achieve the above-mentioned method. The multi-split air conditioner includes a compressor, a four-way valve, an outdoor unit coil, an oil separator, an economizer, an economizer expansion valve, a main board cooler, a liquid line shut-off valve, and a sensor module. The compressor is connected to one end of the oil separator, and the four-way valve is connected to the other end of both the outdoor unit coil and the oil separator. An economizer is installed between the main board cooler and the liquid line shut-off valve. The economizer's flow path is divided into a main path and branch paths. The main path is connected to the main board cooler, and the branch paths are located between the connecting pipes of the economizer and the liquid line shut-off valve. The branch paths are connected to the economizer expansion valve and the economizer, respectively. The regulation system includes the following steps: The calculation module is used to calculate the air replenishment pressure from the sensor data acquired by the sensor module. The regulating module is used to adjust the refrigerant supply from the economizer to the compressor based on the gas supply pressure, thereby achieving a stable state at the compressor's gas supply port.

[0054] It is understood that the content of the above method embodiments is applicable to this system embodiment. The specific functions implemented in this system embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0055] This application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described method. This electronic device can be any smart terminal, including tablet computers, in-vehicle computers, etc.

[0056] It is understood that the content of the above method embodiments is applicable to this device embodiment. The specific functions implemented by this device embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0057] Please see Figure 7 , Figure 7 The hardware structure of an electronic device according to another embodiment is illustrated. The electronic device includes: The processor 01 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 702 can be implemented as a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 702 can store the operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 702 and is called and executed by the processor 701 using the methods described in the embodiments of this application. The input / output interface 703 is used to implement information input and output; The communication interface 704 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 705 transmits information between various components of the device (e.g., processor 701, memory 702, input / output interface 703, and communication interface 704); The processor 701, memory 702, input / output interface 703, and communication interface 704 are connected to each other within the device via bus 705.

[0058] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0059] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0060] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0061] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0062] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0063] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0064] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0065] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0066] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0067] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A method for adjusting the air supply pressure of a multi-split air conditioner, characterized in that, The multi-split air conditioner includes a compressor, a four-way valve, an outdoor unit coil, an oil separator, an economizer, an economizer expansion valve, a main board cooler, a liquid line shut-off valve, and a sensor module. The compressor is connected to one end of the oil separator, and the four-way valve is connected to both the outdoor unit coil and the other end of the oil separator. The economizer is located between the main board cooler and the liquid line shut-off valve. The economizer has a main path and branch paths in its flow path. The main path is connected to the main board cooler, and the branch paths are located between the connecting pipes of the economizer and the liquid line shut-off valve, and are connected to the economizer expansion valve and the economizer itself. The adjustment method includes the following steps: The air replenishment pressure is obtained by calculating the sensing data acquired by the sensor module. The refrigerant is adjusted by the economizer according to the gas supply pressure to the compressor, thereby achieving a stable state at the compressor gas supply port.

2. The method according to claim 1, characterized in that, The step of calculating the replenishment pressure from the sensor data acquired by the sensor module includes the following steps: The sensor module is used to obtain the condensing pressure, the evaporation pressure of a single indoor unit, and the load of a single indoor unit. The equivalent evaporation pressure is calculated based on the evaporation pressure of the single indoor unit and the load of the single indoor unit. The equivalent evaporation pressure and the condensation pressure are calculated to obtain the theoretical value of the make-up gas pressure; The theoretical value of the replenishment pressure is corrected to obtain the replenishment pressure.

3. The method according to claim 2, characterized in that, The calculation is based on the evaporation pressure and load of the single indoor unit, and the calculation formula includes: ； in, This represents the equivalent evaporation pressure. This indicates the load of the single indoor unit. The value represents the evaporation pressure of the single indoor unit, and k represents the number of indoor units in operation.

4. The method according to claim 2, characterized in that, The calculation of the equivalent evaporation pressure and the condensation pressure includes the following formulas: ； in, This represents the theoretical value of the air replenishment pressure. This indicates the condensation pressure. This represents the equivalent evaporation pressure.

5. The method according to claim 2, characterized in that, The process of correcting the theoretical value of the replenishment pressure to obtain the replenishment pressure includes the following steps: The main subcooling is obtained by calculating the saturation temperature of the condensing pressure and the outlet temperature of the outdoor unit coil. The undercooling correction value is obtained by comparing the main road undercooling degree with the main road undercooling correction coefficient. The motherboard temperature correction value is obtained by comparing the motherboard temperature with the motherboard temperature correction factor. The gas supply pressure is calculated based on the supercooling correction value, the motherboard temperature correction value, and the theoretical value of the gas supply pressure.

6. The method according to claim 2, characterized in that, It also includes the following steps: When the replenishment pressure is less than the minimum safety threshold, the replenishment pressure is corrected according to the pressure value of the minimum safety threshold to obtain the corrected replenishment pressure; The flash gas saturation temperature is obtained by comparing the corrected gas supply pressure with the physical property table. When the saturation temperature of the flash gas is greater than or equal to the first minimum evaporation temperature threshold, the verified replenishment pressure is obtained; When the outdoor ambient temperature is less than or equal to the low temperature threshold and the duration exceeds the maximum time threshold, the gas replenishment pressure is the minimum safety threshold, and the flash gas saturation temperature is greater than or equal to the second minimum evaporation temperature threshold. The minimum safety threshold is dynamically adjusted based on the outdoor ambient temperature and the cold-climate control parameter library.

7. The method according to claim 6, characterized in that, The step of adjusting the refrigerant supply to the compressor based on the gas supply pressure to achieve a stable state at the compressor gas supply port includes the following steps: The opening of the economizer expansion valve is adjusted according to the replenishment pressure to obtain the real-time flash gas saturation temperature. When the real-time flash gas saturation temperature is within the evaporation temperature threshold range, it is determined whether the gas replenishment pressure is within the safe threshold range. When the gas replenishment pressure is within the safety threshold range, it is determined whether the defrosting temperature sensing bulb temperature is less than the frosting point temperature, the relative humidity is greater than or equal to the humidity threshold, and the duration of the condition is greater than the preset time threshold. If all conditions are met, defrosting is performed; otherwise, the equivalent evaporation pressure is updated and calculated in real time. When the real-time flash gas saturation temperature is less than the minimum value of the evaporation temperature threshold range, the replenishment pressure is increased according to the first pressure value; when the real-time flash gas saturation temperature is greater than the maximum value of the evaporation temperature threshold range, the replenishment pressure is decreased according to the second pressure value; it is determined whether the adjusted replenishment pressure is within the safe threshold range. If it is not satisfied, the replenishment pressure is corrected to the safe threshold range by taking the nearest value.

8. The method according to claim 6, characterized in that, Before performing calculations on the sensing data acquired by the sensor module, the following steps are also included: The multi-split air conditioner performs a power-on self-test to determine whether the outdoor ambient temperature is less than or equal to the first low temperature threshold, or whether the cold-zone control mode is manually activated and the outdoor ambient temperature is less than or equal to the second low temperature threshold. When any condition is met, the cold-region control parameter library is loaded, and the spare parameters in the cold-region control parameter library are obtained. The backup parameters are verified and screened by pressure parameters, load or temperature parameters and cold-weather control status parameters, and the indoor unit operating status is screened to obtain accurate backup parameters; The backup parameters include the minimum safety threshold, the main circuit undercooling correction factor, the first minimum evaporation temperature threshold, the second minimum evaporation temperature threshold, and the motherboard temperature correction factor.

9. A system for regulating the replenishment gas pressure of a multi-split air conditioner, characterized in that, The multi-split air conditioner includes a compressor, a four-way valve, an outdoor unit coil, an oil separator, an economizer, an economizer expansion valve, a main board cooler, a liquid line shut-off valve, and a sensor module. The compressor is connected to one end of the oil separator, and the four-way valve is connected to both the outdoor unit coil and the other end of the oil separator. The economizer is located between the main board cooler and the liquid line shut-off valve. The economizer has a main path and branch paths in its flow path. The main path is connected to the main board cooler, and the branch paths are located between the connecting pipes of the economizer and the liquid line shut-off valve, and are connected to the economizer expansion valve and the economizer respectively. The regulating system includes the following steps: The calculation module is used to calculate the air replenishment pressure by processing the sensor data acquired by the sensor module. The regulating module is used to regulate the refrigerant supply from the economizer to the compressor based on the gas supply pressure, so as to obtain a stable state at the compressor gas supply port.

10. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method according to any one of claims 1 to 8.

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