Air conditioner control method based on refrigerant and related equipment

Abstract

The invention discloses an air conditioner control method based on a refrigerant and related equipment, and the method comprises the steps that multiple sets of electrodes arranged in a liquid storage tank obtain multiple sets of current capacitance values, and obtain the current temperature and the current operation parameters of air conditioner equipment; performing weighted calculation according to the multiple groups of capacitance values, and determining the liquid level height of the current refrigerant in the liquid storage tank; calculating according to the multiple groups of capacitance values and the current temperature, determining an effective dielectric constant of the refrigerant in the liquid storage tank, and calculating according to the calculated effective dielectric constant, the current temperature and a preset mapping relation to obtain a current component deviation value and a target volume fraction of the refrigerant; and the operation of the air conditioning equipment is controlled by combining the determined relevant parameters of the refrigerant and the current operation parameters of the air conditioning equipment. The embodiment of the invention can reduce the detection implementation cost and improve the detection precision. The method can be widely applied to the field of air conditioner control.

Description

Technical Field

[0001] This application relates to the field of air conditioning control technology, and in particular to an air conditioning method and related equipment based on refrigerant. Background Technology

[0002] In air conditioning systems, refrigerant exchange heat to achieve cooling or heating functions. In practical applications, the refrigerant charge, oil circulation rate, and mixture concentration are crucial to system efficiency during air conditioning operation. Existing technologies use traditional measurement methods to measure the amount of refrigerant in the receiver tank, such as float switches, pressure sensors, or optical sensors, which have low measurement accuracy. Density measurement or sound velocity measurement methods are used to measure the oil circulation rate and mixture concentration in the refrigerant, but these methods are costly, susceptible to interference, and have low detection accuracy. Summary of the Invention

[0003] The main objective of this application is to propose a refrigerant-based air conditioning control method and related equipment, which can improve detection accuracy and reduce implementation costs.

[0004] To achieve the above objectives, one aspect of this application proposes a refrigerant-based air conditioning control method, the method comprising: The system acquires current multiple sets of capacitance values, current temperature, and current operating parameters, and calculates and determines the current liquid level based on the current multiple sets of capacitance values ​​and a preset weight value; wherein, the current multiple sets of capacitance values ​​are determined by multiple sets of electrodes installed inside the storage tank. The current equivalent dielectric constant is determined by calculation based on the current multiple capacitance values ​​and the current temperature; The current refrigerant parameters are determined by calculation based on the current equivalent dielectric constant and the current temperature; wherein the current refrigerant parameters include the current refrigerant composition offset value and the target volume fraction. The storage tank and air conditioning equipment are controlled according to the current liquid level and the current operating parameters. Oil return control is performed according to the target volume fraction and the current operating parameters. The air conditioning equipment is controlled according to the current refrigerant composition offset value.

[0005] In some embodiments, the step of calculating and determining the current equivalent dielectric constant based on the current multiple sets of capacitance values ​​and the current temperature specifically includes: Temperature compensation is performed on the current multiple sets of capacitance values ​​based on the current temperature and the first preset formula to determine multiple sets of standard capacitance values; The multiple sets of standard capacitance values ​​are divided according to the current liquid level and storage tank parameters to determine the liquid phase capacitance value group; The current equivalent dielectric constant is determined by calculation based on the liquid phase capacitance value set.

[0006] In some embodiments, the step of calculating and determining the current refrigerant parameters based on the current equivalent dielectric constant and the current temperature specifically includes: The target reference dielectric constant is determined by matching the current equivalent dielectric constant, the current temperature, and a preset baseline table; wherein the preset baseline table is obtained by calibrating the dielectric constant of a refrigerant with a reference concentration. The dielectric constant difference is determined by calculating the difference between the current equivalent dielectric constant and the target reference dielectric constant, and the dielectric constant difference is used as the current refrigerant composition offset value. The target volume fraction is determined by consulting a preset oil content calibration table based on the dielectric constant difference and the current temperature; wherein, the preset oil content calibration table is obtained by calibrating multiple groups of refrigerant samples with different oil contents; The current refrigerant parameters are determined based on the current refrigerant composition offset value and the target volume fraction.

[0007] In some embodiments, controlling the air conditioning equipment based on the current liquid level and the current operating parameters of the storage tank specifically includes: The first ratio is determined by calculation based on the current liquid level and storage tank parameters, and the first ratio is compared with a first preset range. The current operating parameters are also compared with a preset parameter threshold set. If the first ratio is greater than the upper limit of the first preset range, the exhaust pressure in the current operating parameters is greater than or equal to the pressure threshold in the preset parameter threshold, and the condenser temperature difference in the current operating parameters is less than the temperature difference threshold in the preset parameter threshold, a first warning message is generated based on the first ratio, and the air conditioner fan speed is increased. If the first ratio is less than the lower limit of the first preset range, and the evaporator outlet superheat in the current operating parameters is greater than the temperature threshold in the preset parameter threshold, a second warning message is generated based on the first ratio, and the air conditioner fan speed is increased.

[0008] In some embodiments, the step of controlling the return oil based on the target volume fraction and the current operating parameters specifically includes: The target volume fraction is compared with a second preset range, and the current operating parameters are compared with preset parameter thresholds; If the target volume fraction is less than the lower limit of the second preset range, the compressor efficiency in the current operating parameters is less than the first efficiency threshold in the preset parameter threshold, and the exhaust temperature in the current operating parameters is greater than the exhaust temperature threshold in the preset parameter threshold, the air conditioning equipment is subjected to oil return circulation processing, the target volume fraction is updated according to the first preset time, and the process is returned to compare the target volume fraction with the second preset range as described above. If the target volume fraction is greater than the upper limit of the second preset range, and the heat exchanger efficiency in the current operating parameters is less than the second efficiency threshold in the preset parameter threshold, a third warning message is generated based on the target volume fraction.

[0009] In some embodiments, controlling the air conditioning equipment based on the current refrigerant composition offset value specifically includes: The current refrigerant composition offset value is analyzed to determine the dielectric constant difference; The current leakage level is determined by matching the dielectric constant difference with a preset level table. The leakage level and the preset parameter adjustment table are matched to determine the parameter adjustment value, and the condenser speed and compressor speed in the air conditioning equipment are adjusted according to the parameter adjustment value.

[0010] To achieve the above objectives, another aspect of this application proposes a refrigerant-based air conditioning control system, the system comprising: The liquid level calculation module is used to obtain current multiple sets of capacitance values, current temperature, and current operating parameters, and to calculate and determine the current liquid level height based on the current multiple sets of capacitance values ​​and preset weight values; wherein, the current multiple sets of capacitance values ​​are determined by multiple sets of electrodes installed in the liquid storage tank; The dielectric constant calculation module is used to calculate and determine the current equivalent dielectric constant based on the current multiple sets of capacitance values ​​and the current temperature. The refrigerant parameter calculation module is used to perform calculations based on the current equivalent dielectric constant and the current temperature to determine the current refrigerant parameters; wherein, the current refrigerant parameters include the current refrigerant composition offset value and the target volume fraction; The execution module is used to control the air conditioning equipment of the storage tank according to the current liquid level and the current operating parameters, to control the oil return according to the target volume fraction and the current operating parameters, and to control the air conditioning equipment according to the current refrigerant composition offset value.

[0011] 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.

[0012] To achieve the above objectives, another aspect of the embodiments of this application proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the methods described above.

[0013] To achieve the above objectives, another aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements the methods described above. The embodiments of this application include at least the following beneficial effects: This application provides a refrigerant-based air conditioning control method, system, electronic device, storage medium, and program product. This solution obtains multiple sets of capacitance values ​​by installing multiple sets of electrodes within a liquid storage tank, and also obtains the current temperature and current operating parameters of the air conditioning equipment. A weighted calculation is performed based on the multiple sets of capacitance values ​​to determine the current refrigerant level in the liquid storage tank. Then, based on the multiple sets of capacitance values ​​and the current temperature, the equivalent dielectric constant of the refrigerant in the liquid storage tank is determined. Based on the calculated equivalent dielectric constant, the current temperature, and a preset mapping relationship... Calculations are performed to obtain the current composition offset value and target volume fraction of the refrigerant. Combined with the determined relevant parameters of the refrigerant and the current operating parameters of the air conditioning equipment, the operation of the air conditioning equipment is controlled. By setting up multi-level resistors, multiple sets of capacitance values ​​of the refrigerant are obtained. Based on the obtained sets of capacitance values, multiple parameters of the refrigerant are calculated, including liquid level, composition offset value, equivalent dielectric constant, and target volume fraction, reducing the cost of refrigerant parameter detection. At the same time, by obtaining the current temperature, the multiple sets of capacitance values ​​are weighted and calculated to compensate for the influence of temperature on refrigerant parameters, thereby improving detection accuracy. Attached Figure Description

[0014] Figure 1 This is a flowchart of an air conditioning control method based on refrigerant provided in an embodiment of this application; Figure 2 yes Figure 1 The flowchart of step S102 in the document; Figure 3 yes Figure 1 The flowchart of step S103 in the process; Figure 4 yes Figure 1 The flowchart of step S104 in the process; Figure 5 yes Figure 1 Another flowchart of step S104 in the process; Figure 6 yes Figure 1 Another flowchart of step S104 in the process; Figure 7 (a)- Figure 7 (c) is a schematic diagram of a structure in which multiple sets of electrodes are arranged in a specific embodiment provided in this application; Figure 8 This is a schematic diagram of an oil calibration table in a specific embodiment provided in this application; Figure 9 This is a schematic diagram of a medium concentration table in a specific embodiment provided in this application; Figure 10 This is a schematic diagram of the structure of an air conditioning control system based on refrigerant provided in an embodiment of this application; Figure 11 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0015] 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.

[0016] 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.”

[0017] 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.

[0018] 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.

[0019] 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.

[0020] Liquid refrigerant tank: A cylindrical container used in air conditioning systems to store liquid refrigerant, usually made of metal or composite materials.

[0021] Electrode: An arc-shaped or plate-shaped structure made of conductive material (such as stainless steel) used to form an electric field and measure capacitance; in this invention, the electrode pair consists of two 170-degree arcs forming an approximate circle, or two small parallel plates forming a pair of parallel electrodes, or a pair of rings, or rings plus concentric cylinders.

[0022] Capacitance: An electrical parameter representing the ability to store charge, measured in farads (F). The capacitance value depends on the dielectric constant, electrode area, and spacing. In this application, the capacitance measured is typically in the pF range.

[0023] Dielectric constant: A measure of a material's ability to polarize in an electric field. It has no unit and different substances (such as refrigerants and oils) have different dielectric constants.

[0024] Liquid level: The height of liquid in a storage tank, usually expressed as a percentage or in millimeters.

[0025] Oil circulation rate: The weight percentage of oil in the refrigerant, reflecting the circulation of compressor oil within the refrigeration or air conditioning system.

[0026] Mixture concentration: The proportion of each component in a refrigerant, such as the content of high-pressure components and low-pressure components in a mixed refrigerant.

[0027] Control strategy: Adjusting the operating parameters of the refrigeration or air conditioning system, including condenser fan speed, compressor speed, and expansion valve opening, to optimize performance.

[0028] Figure 1 This is an optional flowchart of the refrigerant-based air conditioning control method provided in the embodiments of this application. Figure 1 The method may include, but is not limited to, steps S101 to S104.

[0029] Step S101: Obtain the current multiple sets of capacitance values, current temperature, and current operating parameters; calculate and determine the current liquid level height based on the current multiple sets of capacitance values ​​and preset weight values; wherein, the current multiple sets of capacitance values ​​are determined by multiple sets of electrodes installed in the liquid storage tank; Step S102: Calculate and determine the current equivalent dielectric constant based on the current multiple capacitance values ​​and the current temperature; Step S103: Calculate and process the current equivalent dielectric constant and current temperature to determine the current refrigerant parameters; wherein, the current refrigerant parameters include the current refrigerant composition offset value and the target volume fraction; Step S104: Control the air conditioning equipment by controlling the liquid storage tank according to the current liquid level and current operating parameters; control the oil return according to the target volume fraction and current operating parameters; and control the air conditioning equipment according to the current refrigerant composition offset value.

[0030] In steps S101 to S104 of this embodiment, multiple sets of electrodes are installed in the refrigerant storage tank, with a certain distance between each set of electrodes. Each set of electrodes is connected to an independent capacitance measurement circuit to read the capacitance value of each set of electrodes in real time. At the same time, the current temperature of the environment where the air conditioning equipment is located and the current operating parameters of the air conditioning equipment, including compressor speed, fan speed, condenser temperature, and exhaust pressure, are collected by sensors. Then, based on the real-time detected multiple sets of capacitance values ​​and preset weight values, the current refrigerant level in the storage tank is calculated using the following formula. , in, This refers to the refrigerant level. For the height of the storage tank, For the first Group electrodes, For the first Weighting factors for group electrodes For the first The capacitance value is measured by the electrode group. Based on the calculated liquid level, the air conditioning equipment can determine the refrigerant injection status and adjust it according to the current operating parameters, such as adjusting the compressor speed and the expansion valve opening. Different media fill the electrodes in the receiver tank, resulting in different measured capacitance values. Calculations based on these capacitance values ​​determine the dielectric constant of the medium, thus identifying the type of medium. Since the dielectric constant is a function of density, which in turn is a function of temperature, it is affected by temperature. The measured capacitance value is compensated by real-time temperature data to obtain the equivalent dielectric constant of the refrigerant mixture in the receiver tank. Based on the equivalent dielectric constant, current temperature, and preset calibration relationships, the current component offset and target oil volume fraction in the refrigerant are determined, thus assessing the refrigerant's performance. These parameters are then adjusted according to the current operating parameters of the air conditioning equipment to meet user needs.

[0031] Please see Figure 2 In some embodiments, step S102 may include, but is not limited to, steps S201 to S203: Step S201: Perform temperature compensation on the current multiple sets of capacitance values ​​according to the current temperature and the first preset formula, and determine multiple sets of standard capacitance values; Step S202: Divide multiple sets of standard capacitance values ​​according to the current liquid level and storage tank parameters to determine the liquid phase capacitance value group; Step S203: Calculate the current equivalent dielectric constant based on the liquid phase capacitance value set.

[0032] In step S201 of some embodiments, after obtaining multiple sets of capacitance values ​​through multiple sets of electrodes, temperature compensation is performed on the current multiple sets of capacitances based on the real-time measured current temperature and a preset compensation formula to obtain a standard capacitance value. The compensation formula is established based on capacitance measurements performed at room temperature with different types of dielectric materials filling the storage tank, and the corresponding dielectric constants are calculated. In this embodiment, the compensation formula is as follows: , in, The dielectric constant is the temperature-compensated value. , and These are the calibration coefficients, The current temperature is used; the compensated capacitance value can be calculated based on the dielectric constant of the temperature compensation.

[0033] In step S202 of some embodiments, the electrode group submerged in the current liquid storage tank is determined based on the calculated current liquid level height and the height of the storage tank, and the electrode group in the storage tank is divided into liquid phase electrode group submerged in refrigerant and gas phase electrode group not submerged in refrigerant; this is used for subsequent calculation of the equivalent dielectric constant of the refrigerant mixture.

[0034] In step S203 of some embodiments, the equivalent dielectric constant of the refrigerant mixture in the storage tank is calculated based on the previously obtained liquid phase capacitance values. For example, the median value among the obtained liquid phase capacitance values ​​is converted to the equivalent dielectric constant, or a weighted average is performed on the obtained liquid phase capacitance values ​​to obtain the equivalent dielectric constant. In this embodiment, the corresponding dielectric constant is calculated using the logarithmic mixture method by measuring the volume fraction of oil in the refrigerant mixture in the liquid phase. , in, Let be the equivalent dielectric constant of the mixture. This represents the volume fraction of the oil. Let be the dielectric constant of oil. is the dielectric constant of the refrigerant.

[0035] Please see Figure 3 In some embodiments, step S103 may include, but is not limited to, steps S301 to S304: Step S301: Match the current equivalent dielectric constant, current temperature and preset baseline table to determine the target reference dielectric constant; wherein, the preset baseline table is obtained by calibrating the dielectric constant of a reference concentration of refrigerant. Step S302: Calculate the difference between the current equivalent dielectric constant and the target reference dielectric constant, determine the dielectric constant difference, and use the dielectric constant difference as the current refrigerant composition offset value. Step S303: Based on the difference in dielectric constant and the current temperature, the target volume fraction is determined by querying the preset oil content calibration table; wherein, the preset oil content calibration table is obtained by calibrating multiple groups of refrigerant samples with different oil contents; Step S304: Determine the current refrigerant parameters based on the current refrigerant composition offset value and the target volume fraction.

[0036] In step S301 of some embodiments, the equivalent dielectric constant of the refrigerant mixture is obtained by extracting the liquid phase capacitance value and then matched with the current temperature and a preset mixture composition baseline to determine the dielectric constant of the reference concentration of refrigerant at the current temperature as the target reference dielectric constant; wherein, the mixture composition baseline is obtained by measuring the dielectric constant of the reference concentration of refrigerant.

[0037] In step S302 of some embodiments, a difference calculation is performed based on the obtained target reference dielectric constant and the calculated equivalent dielectric constant to obtain a dielectric constant difference value. This dielectric constant difference value indicates the refrigerant composition offset caused by the mixing of substances such as lubricating oil and refrigeration oil from the air conditioning equipment into the reference concentration of refrigerant, as well as the volatilization of refrigerant components during the operation of the air conditioning equipment.

[0038] In step S303 of some embodiments, after obtaining the dielectric constant difference, the target volume fraction corresponding to the current equivalent dielectric constant is determined by querying the dielectric constant difference with a pre-set oil calibration table, i.e., the volume fraction of oil mixed in the refrigerant. In this embodiment, the oil calibration table is established by preparing a refrigerant mixture sample with a certain volume fraction and measuring the capacitance of the sample at different temperatures.

[0039] In step S304 of some embodiments, the obtained refrigerant composition offset value and target volume fraction are sorted to obtain the parameters of the refrigerant.

[0040] Please see Figure 4 In some embodiments, step S104 may include, but is not limited to, steps S401 to S403: Step S401: Calculate the first ratio based on the current liquid level and storage tank parameters, compare the first ratio with the first preset range, and compare the current operating parameters with the preset parameter threshold set. Step S402: If the first ratio is greater than the upper limit of the first preset range, the exhaust pressure in the current operating parameters is greater than or equal to the pressure threshold in the preset parameter threshold, and the condenser temperature difference in the current operating parameters is less than the temperature difference threshold in the preset parameter threshold, generate a first warning message based on the first ratio and increase the air conditioner fan speed. Step S403: If the first ratio is less than the lower limit of the first preset range, and the evaporator outlet superheat in the current operating parameters is greater than the temperature threshold in the preset parameter threshold, generate a second warning message based on the first ratio and increase the air conditioner fan speed.

[0041] In step S401 of some embodiments, the proportion of refrigerant liquid level is determined by calculating the ratio between the current liquid level height and the height of the storage tank. The refrigerant injection status is then judged based on the proportion and the set threshold range, and the parameters of the air conditioning equipment are adjusted in conjunction with the current operating parameters of the air conditioning equipment. In this embodiment, the threshold range is set to the normal liquid level range of refrigerant injection, such as 10% to 90%.

[0042] In step S402 of some embodiments, if the proportion is greater than the upper limit of the set threshold range, and the current exhaust pressure of the air conditioning equipment is higher than the set threshold, and the temperature difference on the refrigerant side of the condenser of the air conditioning equipment is lower than the set limit value, it indicates that the refrigerant level is too high. The air conditioning equipment generates corresponding abnormal information based on the proportion to prompt the maintenance personnel to handle the situation, and controls the fan speed of the air conditioning equipment to increase the heat dissipation capacity of the condenser, reduce the impact of excessive refrigerant on the air conditioning equipment, and perform emergency handling. In this embodiment, when the height proportion is detected to be higher than 0.9 and lasts for 240 seconds, and the exhaust pressure of the air conditioning equipment is detected to be abnormally high, and the temperature difference on the refrigerant side of the condenser decreases to an abnormal value, the air conditioning equipment prompts "liquid level too high" and increases the fan speed; when the height proportion is detected to be less than 0.9 and remains so for 180 seconds, the fan speed is restored to its initial speed.

[0043] In step S403 of some embodiments, if the detected height percentage is less than the lower limit of a set threshold range, and the sensor detects that the superheat at the evaporator outlet of the air conditioning unit is higher than the set threshold, the air conditioning unit generates a corresponding prompt message based on the current height percentage. Meanwhile, maintenance personnel process the prompt message and control the fan speed of the air conditioning unit to increase the heat exchange of the condenser, ensuring the cooling capacity of the air conditioning unit. In this embodiment, when the detected height percentage is less than 0.1 and the detected superheat at the evaporator outlet is higher than 15K, the air conditioning unit generates a "meaning insufficient refrigerant charge" prompt message, possibly due to a low refrigerant level in the storage tank or refrigerant leakage causing insufficient refrigerant circulating in the air conditioning unit. When the detected height percentage is greater than 0.1 and remains so for 90 seconds, or when the fan speed of the air conditioning unit increases and runs for 180 seconds, the fan speed is restored to its initial speed.

[0044] Please see Figure 5 In some embodiments, step S104 may also include, but is not limited to, steps S501 to S503: Step S501: Compare the target volume fraction with the second preset range, and compare the current operating parameters with the preset parameter threshold. Step S502: If the target volume fraction is less than the lower limit of the second preset range, the compressor efficiency in the current operating parameters is less than the first efficiency threshold in the preset parameter threshold, and the exhaust temperature in the current operating parameters is greater than the exhaust temperature threshold in the preset parameter threshold, perform oil return circulation processing on the air conditioning equipment, update the target volume fraction according to the first preset time, and return to perform the above comparison of the target volume fraction with the second preset range. Step S503: If the target volume fraction is greater than the upper limit of the second preset range, and the heat exchanger efficiency in the current operating parameters is less than the second efficiency threshold in the preset parameter threshold, generate a third warning message based on the target volume fraction.

[0045] In step S501 of some embodiments, the calculated target volume fraction is compared with a set threshold range, and the current operating parameters of the air conditioning equipment are compared with the corresponding operating threshold range. The parameters of the air conditioning equipment are adjusted based on the comprehensive comparison results. In this embodiment, the target volume fraction is the oil circulation rate.

[0046] In step S502 of some embodiments, if the target volume fraction is less than the lower limit of a set threshold range, and the compressor efficiency in the air conditioning unit is detected by the sensor to be lower than the set threshold, and the exhaust temperature of the air conditioning unit is too high, the air conditioning unit executes an oil return cycle according to a preset control program, and detects the target volume fraction at set time intervals, comparing the detected target volume fraction with the set threshold range to determine whether to exit the oil return cycle; in this embodiment, when the target volume fraction is less than 1%, and a decrease in compressor efficiency and an increase in exhaust temperature are detected, the air conditioning unit starts a preset oil return cycle program, and evaluates it every 30 seconds to determine the oil content in the refrigerant. Whether the target volume fraction has returned to the normal range, such as 3% to 7%; if the target volume fraction is detected to be lower than the set threshold range for 5 consecutive times, the air conditioning unit will be forced to enter the set oil return cycle; during the execution of the oil return cycle, the target volume fraction will continue to be detected according to the set time interval. If the target volume fraction is detected to be within the set threshold range for 3 consecutive times, the air conditioning unit will exit the oil return cycle program, or the oil return cycle program will also exit after running continuously for 600 seconds; at the same time, if the air conditioning unit exits the oil return cycle program due to other needs during the execution of the oil return cycle program, it will enter a 90-second oil return cycle after shutdown or the next startup to protect the compressor.

[0047] In step S503 of some embodiments, if the target volume fraction is detected to be greater than the upper limit of the set threshold range, and the efficiency of the heat exchanger of the air conditioning equipment is detected by the sensor to be lower than the set threshold under multiple operating conditions, the air conditioning equipment generates a prompt message based on the current target volume fraction so that the maintenance personnel can handle it; in this embodiment, the target volume fraction is detected to be greater than 12%, and the efficiency of the heat exchanger is detected to be reduced under multiple operating conditions, the air conditioning equipment prompts that the oil circulation rate is too high, so as to prompt the maintenance personnel to repair the compressor, or that the initial oil charge is too high.

[0048] Please see Figure 6 In some embodiments, step S104 may also include, but is not limited to, steps S601 to S603: Step S601: Analyze the current refrigerant composition offset value and determine the dielectric constant difference; Step S602: Match the dielectric constant difference with the preset level table to determine the current leakage level; Step S603: Match the leakage level with the preset parameter adjustment table to determine the parameter adjustment value, and adjust the condenser speed and compressor speed in the air conditioning equipment according to the parameter adjustment value.

[0049] In step S601 of some embodiments, during the operation of the air conditioning equipment, greases such as cooling oil and lubricating oil in the compressor mix into the circulating refrigerant, forming a mixture that participates in the refrigerant circulation. The air conditioning equipment needs to detect the concentration of refrigerant in the mixture in real time to ensure the normal operation of the air conditioning equipment. By detecting the degree of change in dielectric constant, the concentration of refrigerant in the mixture can be deduced, thereby determining whether the refrigerant mixture in the air conditioning equipment is leaking, determining the corresponding leakage level, and initiating the corresponding processing procedure based on the determined leakage level to adjust the operating parameters of the air conditioning equipment.

[0050] In step S602 of some embodiments, the calculated dielectric constant change value is matched with the leakage level table set in the air conditioning equipment to determine whether the refrigerant is leaking and the degree of leakage, thereby determining the control strategy to be adopted; in this embodiment, a dielectric constant change value between 0.3 and 0.5 is set as a slight leakage, between 0.5 and 0.8 as a moderate leakage, and above 0.8 as a severe leakage.

[0051] In step S603 of some embodiments, the corresponding parameter adjustment value is determined based on the determined leakage level and in combination with the operating parameters of the air conditioning equipment; in this embodiment, the speed of the condenser fan in the air conditioning equipment is determined to be 20%, the pressure is 1.8 MPa before the dielectric constant decreases, and the pressure is adjusted to 1.6 MPa after the dielectric constant decrease is detected.

[0052] The solutions of the embodiments of the present invention will be described in detail and explained below with reference to specific application examples: Please see Figure 7 (a) to Figure 7 (c) Figure 7 (a) and Figure 7 (b) In a specific embodiment, four sets of electrodes are installed at different heights in the storage tank at certain intervals; Figure 7(c) Selectable electrode configuration in a specific embodiment; The current liquid level of the refrigerant mixture in the storage tank is detected; each electrode outputs the detected capacitance value, and the liquid level in the storage tank is calculated based on the capacitance value. A certain amount of refrigerant is charged into a storage tank with a height of 200mm, and the capacitance values ​​measured by the four sets of electrodes are read as C_1=15pF, C_2=12pF, C_3=5pF, and C_4=3pF, respectively. The calculated liquid level in the storage tank is 100mm. The calculated liquid level is compared with the set normal liquid level range to determine that the current liquid level is within the normal range. Then, the starting point is determined based on the calculated liquid level. The liquid phase capacitance is determined from multiple sets of capacitance values ​​detected in real time, and a weighted calculation is performed based on the liquid phase capacitance to determine the equivalent dielectric constant of the refrigerant mixture. The difference between the calculated equivalent dielectric constant and the pre-calibrated baseline of the mixture composition is calculated to determine the dielectric constant change. Then, the corresponding dielectric constant is determined by conversion based on the measured liquid phase capacitance, and the difference is calculated based on the pre-calibrated dielectric constant of the pure refrigerant to determine the dielectric constant difference. Based on the determined oil circulation rate and the calculated dielectric constant change, it is matched with a preset concentration-dielectric constant relationship chart to determine the current mixture concentration change, and thus the refrigerant leakage level. The concentration-dielectric constant relationship chart is shown below. Figure 9 As shown; if the dielectric constant decreases by 0.7, the leakage level is determined to be a severe leak, resulting in a change in the proportion of refrigerant mixture components, which in turn affects the condenser pressure, compressor speed, and expansion valve opening of the air conditioning equipment. Based on the current operating requirements of the air conditioning equipment and the calculated leakage level, the corresponding adjustment parameters are determined. For example, before the dielectric constant change, the condenser fan speed is 60%, the condenser pressure is 2.2 MPa, the compressor speed is 60%, and the output cooling capacity is 4 kW. After detecting the decrease in dielectric constant, the condenser pressure is adjusted to 2.0 MPa, and the compressor speed is adjusted to 70%. Due to the adjustment of the condenser fan speed and compressor speed parameters, the air conditioning equipment forms a new operating condition. The air conditioning equipment adjusts the expansion valve opening according to the new operating condition and uses PID control to optimize superheat, forming a new steady-state equilibrium. The calculated dielectric constant difference is matched with the preset oil calibration chart to determine the corresponding oil circulation rate; where the oil calibration chart is as follows. Figure 8 As shown, for example, if the dielectric constant change rate is found to be -6%, the current oil circulation rate is determined to be approximately 5% through matching, and then the oil return strategy is determined based on the determined oil circulation rate.

[0053] The embodiments of this application include at least the following beneficial effects: This application provides a refrigerant-based air conditioning control method, system, electronic device, storage medium, and program product. This solution obtains multiple sets of capacitance values ​​by installing multiple sets of electrodes within a liquid storage tank, and also obtains the current temperature and current operating parameters of the air conditioning equipment. A weighted calculation is performed based on the multiple sets of capacitance values ​​to determine the current refrigerant level in the liquid storage tank. Then, based on the multiple sets of capacitance values ​​and the current temperature, the equivalent dielectric constant of the refrigerant in the liquid storage tank is determined. Based on the calculated equivalent dielectric constant, the current temperature, and a preset mapping relationship... Calculations are performed to obtain the current composition offset value and target volume fraction of the refrigerant. Combined with the determined relevant parameters of the refrigerant and the current operating parameters of the air conditioning equipment, the operation of the air conditioning equipment is controlled. By setting up multi-level resistors, multiple sets of capacitance values ​​of the refrigerant are obtained. Based on the obtained sets of capacitance values, multiple parameters of the refrigerant are calculated, including liquid level, composition offset value, equivalent dielectric constant, and target volume fraction, reducing the cost of refrigerant parameter detection. At the same time, by obtaining the current temperature, the multiple sets of capacitance values ​​are weighted and calculated to compensate for the influence of temperature on refrigerant parameters, thereby improving detection accuracy.

[0054] Please see Figure 10 This application also provides a refrigerant-based air conditioning control method that can implement the above method. The system includes: The liquid level calculation module is used to obtain current multiple sets of capacitance values, current temperature, and current operating parameters, and to calculate and determine the current liquid level height based on the current multiple sets of capacitance values ​​and preset weight values; wherein, the current multiple sets of capacitance values ​​are determined by multiple sets of electrodes installed in the liquid storage tank; The dielectric constant calculation module is used to calculate and determine the current equivalent dielectric constant based on the current multiple sets of capacitance values ​​and the current temperature. The refrigerant parameter calculation module is used to perform calculations based on the current equivalent dielectric constant and the current temperature to determine the current refrigerant parameters; wherein, the current refrigerant parameters include the current refrigerant composition offset value and the target volume fraction; The execution module is used to control the air conditioning equipment of the storage tank according to the current liquid level and the current operating parameters, to control the oil return according to the target volume fraction and the current operating parameters, and to control the air conditioning equipment according to the current refrigerant composition offset value.

[0055] It is understood that the content of the above method embodiments is applicable to the present device embodiments. The specific functions implemented by the present device embodiments 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.

[0056] 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.

[0057] 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.

[0058] Please see Figure 11 , Figure 11 The hardware structure of an electronic device according to another embodiment is illustrated. The electronic device includes: The processor 1101 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 1102 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 1102 can store the operating system and other applications. 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 1102 and is called and executed by the processor 1101 using the methods described in the embodiments of this application. Input / output interface 1103 is used to implement information input and output; The communication interface 1104 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 1105 transmits information between various components of the device (e.g., processor 1101, memory 1102, input / output interface 1103, and communication interface 1104); The processor 1101, memory 1102, input / output interface 1103 and communication interface 1104 are connected to each other within the device via bus 1105.

[0059] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method.

[0060] It is understood that the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented in this storage medium 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.

[0061] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0062] It is understood that the content of the above method embodiments is applicable to the embodiments of this program product. The specific functions implemented by the embodiments of this program product 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0069] 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.

[0070] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0071] 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.

[0072] 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.

[0073] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0074] 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 refrigerant-based air conditioning control method, characterized in that, The method includes: The system acquires current multiple sets of capacitance values, current temperature, and current operating parameters, and calculates and determines the current liquid level based on the current multiple sets of capacitance values ​​and a preset weight value; wherein, the current multiple sets of capacitance values ​​are determined by multiple sets of electrodes installed inside the storage tank. The current equivalent dielectric constant is determined by calculation based on the current multiple capacitance values ​​and the current temperature; The current refrigerant parameters are determined by calculation based on the current equivalent dielectric constant and the current temperature; wherein the current refrigerant parameters include the current refrigerant composition offset value and the target volume fraction. The storage tank and air conditioning equipment are controlled according to the current liquid level and the current operating parameters. Oil return control is performed according to the target volume fraction and the current operating parameters. The air conditioning equipment is controlled according to the current refrigerant composition offset value.

2. The method according to claim 1, characterized in that, The step of calculating and determining the current equivalent dielectric constant based on the current multiple capacitance values ​​and the current temperature specifically includes: Temperature compensation is performed on the current multiple sets of capacitance values ​​based on the current temperature and the first preset formula to determine multiple sets of standard capacitance values; The multiple sets of standard capacitance values ​​are divided according to the current liquid level and storage tank parameters to determine the liquid phase capacitance value group; The current equivalent dielectric constant is determined by calculation based on the liquid phase capacitance value set.

3. The method according to claim 1, characterized in that, The step of calculating and processing the current refrigerant parameters based on the current equivalent dielectric constant and the current temperature specifically includes: The target reference dielectric constant is determined by matching the current equivalent dielectric constant, the current temperature, and a preset baseline table; wherein the preset baseline table is obtained by calibrating the dielectric constant of a refrigerant with a reference concentration. The dielectric constant difference is determined by calculating the difference between the current equivalent dielectric constant and the target reference dielectric constant, and the dielectric constant difference is used as the current refrigerant composition offset value. The target volume fraction is determined by consulting a preset oil content calibration table based on the dielectric constant difference and the current temperature; wherein, the preset oil content calibration table is obtained by calibrating multiple groups of refrigerant samples with different oil contents; The current refrigerant parameters are determined based on the current refrigerant composition offset value and the target volume fraction.

4. The method according to claim 1, characterized in that, The control of the air conditioning equipment by the storage tank based on the current liquid level and the current operating parameters specifically includes: The first ratio is determined by calculation based on the current liquid level and storage tank parameters, and the first ratio is compared with a first preset range. The current operating parameters are also compared with a preset parameter threshold set. If the first ratio is greater than the upper limit of the first preset range, the exhaust pressure in the current operating parameters is greater than or equal to the pressure threshold in the preset parameter threshold, and the condenser temperature difference in the current operating parameters is less than the temperature difference threshold in the preset parameter threshold, a first warning message is generated based on the first ratio, and the air conditioner fan speed is increased. If the first ratio is less than the lower limit of the first preset range, and the evaporator outlet superheat in the current operating parameters is greater than the temperature threshold in the preset parameter threshold, a second warning message is generated based on the first ratio, and the air conditioner fan speed is increased.

5. The method according to claim 1, characterized in that, The oil return control based on the target volume fraction and the current operating parameters specifically includes: The target volume fraction is compared with a second preset range, and the current operating parameters are compared with preset parameter thresholds; If the target volume fraction is less than the lower limit of the second preset range, the compressor efficiency in the current operating parameters is less than the first efficiency threshold in the preset parameter threshold, and the exhaust temperature in the current operating parameters is greater than the exhaust temperature threshold in the preset parameter threshold, the air conditioning equipment is subjected to oil return circulation processing, the target volume fraction is updated according to the first preset time, and the process is returned to compare the target volume fraction with the second preset range as described above. If the target volume fraction is greater than the upper limit of the second preset range, and the heat exchanger efficiency in the current operating parameters is less than the second efficiency threshold in the preset parameter threshold, a third warning message is generated based on the target volume fraction.

6. The method according to claim 1, characterized in that, The control of the air conditioning equipment based on the current refrigerant composition offset value specifically includes: The current refrigerant composition offset value is analyzed to determine the dielectric constant difference; The current leakage level is determined by matching the dielectric constant difference with a preset level table. The leakage level and the preset parameter adjustment table are matched to determine the parameter adjustment value, and the condenser speed and compressor speed in the air conditioning equipment are adjusted according to the parameter adjustment value.

7. A refrigerant-based air conditioning control system, characterized in that, The system includes: The liquid level calculation module is used to obtain current multiple sets of capacitance values, current temperature, and current operating parameters, and to calculate and determine the current liquid level height based on the current multiple sets of capacitance values ​​and preset weight values; wherein, the current multiple sets of capacitance values ​​are determined by multiple sets of electrodes installed in the liquid storage tank; The dielectric constant calculation module is used to calculate and determine the current equivalent dielectric constant based on the current multiple sets of capacitance values ​​and the current temperature. The refrigerant parameter calculation module is used to perform calculations based on the current equivalent dielectric constant and the current temperature to determine the current refrigerant parameters; wherein, the current refrigerant parameters include the current refrigerant composition offset value and the target volume fraction; The execution module is used to control the air conditioning equipment of the storage tank according to the current liquid level and the current operating parameters, to control the oil return according to the target volume fraction and the current operating parameters, and to control the air conditioning equipment according to the current refrigerant composition offset value.

8. An electronic device, characterized in that, include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 6.

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