Expansion valve opening degree control method and device, air conditioner and storage medium

Abstract

The application discloses an expansion valve opening degree control method and device, an air conditioner and a storage medium. The expansion valve opening degree control method comprises the following steps: after the air conditioner is started, determining an initial target opening degree of an expansion valve according to the working condition of the air conditioner, and controlling the expansion valve to run in an open loop at the initial target opening degree; after the air conditioner runs at the initial target opening degree for a preset time or the exhaust temperature of a compressor is greater than or equal to a preset exhaust temperature, determining the running opening degree of the expansion valve according to the suction superheat degree of the compressor, and controlling the expansion valve to run in a closed loop at the running opening degree. The expansion valve opening degree control method firstly controls the expansion valve to run at the initial target opening degree according to the working condition of the air conditioner, and then determines the opening degree of the expansion valve according to the suction superheat degree, so that the suction superheat degree of the non-azeotropic mixed refrigerant is kept at a relatively appropriate level, and the energy efficiency of the non-azeotropic mixed refrigerant is relatively high.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and in particular to an expansion valve opening control method, device, air conditioner, and storage medium. Background Technology

[0002] Most air conditioners currently use R32 (difluoromethane) as refrigerant. With the Kigali Amendment to the Montreal Protocol adding R32 to the list of refrigerants to be phased out, the search for new environmentally friendly refrigerants has become urgent. Since R290 (propane), currently considered a long-term replacement, has high requirements for refrigeration systems and is difficult to directly replace, it is particularly important to find a long-term, environmentally friendly alternative that can directly replace R32 systems. Some new hybrid hydrocarbon refrigerants have great development potential, but due to the temperature glide characteristic of these non-azeotropic hybrid refrigerants, conventional expansion valve control cannot achieve optimal heat exchange efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide an expansion valve opening control method, device, air conditioner, and storage medium, aiming to improve the technical problem of low heat exchange efficiency caused by the temperature slip characteristics of non-azeotropic mixed refrigerants in the prior art.

[0004] An embodiment of the present invention provides a method for controlling the opening degree of an expansion valve, comprising:

[0005] After the air conditioner is started, the initial target opening degree of the expansion valve is determined according to the operating conditions of the air conditioner, and the expansion valve is controlled to operate in open loop at the initial target opening degree.

[0006] After the air conditioner operates at the initial target opening for a preset time or the compressor's exhaust temperature is greater than or equal to the preset exhaust temperature, the operating opening of the expansion valve is determined based on the compressor's suction superheat, and the expansion valve is controlled to operate in a closed loop at the operating opening.

[0007] In some embodiments of the present invention, determining the operating opening degree of the expansion valve based on the suction superheat of the compressor includes:

[0008] Determine whether the intake superheat of the previous sampling period is within the preset superheat range;

[0009] When it is determined that the intake superheat in the previous sampling period is within the preset superheat range, the operating opening of the expansion valve in the previous sampling period is taken as the operating opening of the expansion valve in the current sampling period.

[0010] When it is determined that the intake superheat in the previous sampling period is not within the preset superheat range, the operating opening of the expansion valve in the current sampling period is determined based on the intake superheat in the current sampling period, the intake superheat in the previous sampling period, and the operating opening of the expansion valve in the previous sampling period.

[0011] In some embodiments of the present invention, determining the operating opening of the expansion valve in the current sampling period based on the intake superheat of the current sampling period, the intake superheat of the previous sampling period, and the operating opening of the expansion valve in the previous sampling period includes:

[0012] Determine the first difference between the intake superheat and the target superheat in the current sampling period;

[0013] Determine a second difference between the intake superheat and the target superheat from the previous sampling period;

[0014] Based on the first difference, the second difference, and the operating opening of the expansion valve in the previous sampling period, the operating opening of the expansion valve in the current sampling period is determined.

[0015] In some embodiments of the present invention, before determining whether the intake superheat of the current sampling period is within a preset superheat range, the expansion valve opening control method further includes:

[0016] Determine the suction saturation temperature based on the compressor's suction pressure;

[0017] The suction superheat is determined based on the compressor's suction temperature and the suction saturation temperature.

[0018] In some embodiments of the present invention, determining the initial target opening degree of the expansion valve based on the air conditioner's operating conditions includes:

[0019] Determine the refrigerant compensation opening based on the compressor operating conditions and expansion valve operating conditions;

[0020] The initial target opening is determined based on the refrigerant compensation opening and the basic initial opening.

[0021] In some embodiments of the present invention, determining the refrigerant compensation opening degree based on the compressor operating conditions and the expansion valve operating conditions includes:

[0022] Based on the compressor's operating conditions, determine the compressor's highest and lowest operating frequencies under the current operating conditions;

[0023] Based on the operating conditions of the expansion valve, determine the maximum and minimum operating opening of the expansion valve under the current operating conditions;

[0024] The refrigerant compensation opening is determined based on the highest operating frequency, the lowest operating frequency, the maximum operating opening, and the minimum operating opening.

[0025] In some embodiments of the present invention, before determining the initial target opening based on the refrigerant compensation opening and the basic initial opening, the expansion valve opening control method further includes:

[0026] Determine the initial opening of the foundation based on the set temperature, operating windshield, indoor temperature, outdoor temperature, and exhaust temperature.

[0027] In some embodiments of the present invention, an expansion valve opening control device is also provided, comprising:

[0028] The acquisition module is used to acquire the real-time opening degree of the expansion valve, the running time of the air conditioner, and the exhaust temperature;

[0029] An open-loop control module is used to determine the initial target opening degree of the expansion valve according to the operating conditions of the air conditioner after the air conditioner is started, and to control the expansion valve to operate in open loop at the initial target opening degree.

[0030] The closed-loop control module is used to determine the operating opening of the expansion valve based on the suction superheat of the compressor after the air conditioner has been running in open loop at the initial target opening for a preset time or the exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature, and to control the expansion valve to run in closed loop at the operating opening, so that the suction superheat of the compressor is within the preset superheat range.

[0031] In some embodiments of the present invention, an air conditioner is also provided, the air conditioner including a memory and a processor, the memory storing a computer program, and the processor running the computer program in the memory to perform the steps in the expansion valve opening control method described above.

[0032] In some embodiments of the present invention, a storage medium is also provided, the storage medium storing a computer program, the computer program being executed and loaded by a processor to perform the steps in the expansion valve opening control method described above.

[0033] Embodiments of the present invention provide an expansion valve opening control method, device, air conditioner, and storage medium for controlling the expansion valve in an air conditioner using a non-azeotropic refrigerant mixture. The expansion valve opening control method first controls the expansion valve to operate in an open loop at an initial target opening based on the air conditioner's operating conditions. Then, it determines the operating opening of the expansion valve based on the suction superheat and controls the air conditioner to operate in a closed loop at the operating opening. This maintains the suction superheat of the non-azeotropic refrigerant mixture at a suitable level, allowing different components in the non-azeotropic refrigerant mixture to operate in a boiling state within the evaporator, thereby resulting in higher energy efficiency of the non-azeotropic refrigerant mixture. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 This is a flowchart illustrating an embodiment of the expansion valve opening control method of the present invention.

[0036] Figure 2 This is a schematic diagram of the structure of an expansion valve opening control device according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention.

[0038] Reference numerals: 10, Expansion valve opening control device; 100, Acquisition module; 200, Open-loop control module; 300, Closed-loop control module; 601, Processor; 602, Memory; 603, Power supply; 604, Input unit. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] like Figures 1-3 As shown, this invention provides a method for controlling the opening degree of an expansion valve, used to control the expansion valve in an air conditioner that uses a non-azeotropic refrigerant mixture. The method for controlling the opening degree of the expansion valve includes:

[0044] S100 determines the initial target opening of the expansion valve based on the air conditioner's operating conditions after the air conditioner is started, and controls the expansion valve to operate in open loop at the initial target opening.

[0045] The operating condition of an air conditioner refers to the working status of its various components after the air conditioner is started, such as the compressor's operating frequency, suction temperature, exhaust temperature, and fan speed.

[0046] Since the operating condition of the air conditioner is greatly affected by external environmental factors such as indoor and outdoor temperatures, it is necessary to continuously update the initial target opening and adjust the opening of the expansion valve to the updated initial target opening.

[0047] S200: After the air conditioner has been running at the initial target opening for a preset time or the compressor's exhaust temperature is greater than or equal to the preset exhaust temperature, the operating opening of the expansion valve is determined based on the compressor's suction superheat, and the expansion valve is controlled to operate in a closed loop at this operating opening so that the compressor's suction superheat is within the preset superheat range.

[0048] The purpose of this method is to allow the air conditioner to quickly reach a comfortable cooling or heating set temperature by reaching an initial target opening degree within a preset time or by ensuring the compressor's exhaust temperature is greater than or equal to a preset exhaust temperature. The specific value of the preset time can be set according to actual needs, and this embodiment does not limit this setting; for example, the preset time can be set to 4-6 minutes, such as 4 minutes, 4.5 minutes, 5 minutes, 5.5 minutes, or 6 minutes. Similarly, the specific value of the preset exhaust temperature can be set according to actual needs, and this embodiment does not limit this setting; for example, the preset time can be set to 50-60℃, such as 50℃, 52℃, 55℃, 57℃, 58℃, or 60℃.

[0049] The preset superheat range can be set according to the composition of the non-azeotropic refrigerant mixture; when the compressor suction superheat is within the preset superheat range, different components of the non-azeotropic refrigerant mixture can all operate in a boiling state in the evaporator.

[0050] The purpose of determining the operating opening of the expansion valve based on the superheat of the compressor's suction gas is to adjust the opening of the expansion valve according to the superheat of the suction gas, thereby keeping the superheat of the suction gas within a suitable range, so that the air conditioner has higher energy efficiency for non-azeotropic refrigerant mixtures.

[0051] Where, ΔT 过热度 =T 吸气 -T 饱和气 Intake superheat: ΔT 过热度 Inhalation temperature: T 吸气 Intake saturation temperature: T 饱和气 .

[0052] Wherein, the suction temperature is the temperature of the compressor suction port, and the suction saturation temperature is the saturated gas phase temperature of the non-azeotropic refrigerant mixture at the corresponding suction pressure.

[0053] Understandably, this expansion valve opening control method first controls the expansion valve to operate in an open loop at the initial target opening based on the air conditioner's operating conditions. Then, it determines the operating opening of the expansion valve based on the suction superheat and controls the air conditioner to operate in a closed loop at the operating opening. This keeps the suction superheat of the non-azeotropic refrigerant mixture at a suitable level, allowing different components in the non-azeotropic refrigerant mixture to operate in a boiling state within the evaporator, thus resulting in higher energy efficiency for the non-azeotropic refrigerant mixture.

[0054] In some embodiments, S200, determining the operating opening degree of the expansion valve based on the compressor's suction superheat includes:

[0055] S210, determine whether the intake superheat of the previous sampling cycle is within the preset superheat range.

[0056] The preset superheat range is a set range for the suction superheat. This set range is usually stored directly in the air conditioner's controller, and its set range is generally [-0.5, 1]. When the suction superheat is within this range, it generally means that the energy efficiency of the non-azeotropic refrigerant mixture is relatively high.

[0057] S220, when it is determined that the intake superheat of the previous sampling cycle is within the preset superheat range, the operating opening of the expansion valve in the previous sampling cycle is used as the operating opening of the expansion valve in the current sampling cycle.

[0058] The intake superheat for each sampling cycle is the intake superheat at the beginning of each sampling cycle.

[0059] When the intake superheat of the previous sampling cycle is within the preset superheat range, there is no need to change the current expansion valve opening. Maintaining the current opening and continuing to operate will ensure that the non-azeotropic refrigerant mixture of the air conditioner has good energy efficiency.

[0060] For example, if the intake superheat of the previous sampling cycle was 1, then the expansion valve will continue to operate at the current opening.

[0061] S230, when it is determined that the intake superheat of the previous sampling cycle is not within the preset superheat range, the operating opening of the expansion valve in the current sampling cycle is determined based on the intake superheat of the current sampling cycle, the intake superheat of the previous sampling cycle, and the operating opening of the expansion valve in the previous sampling cycle.

[0062] If the intake superheat of the previous sampling cycle is not within the preset superheat range, the opening of the expansion valve needs to be adjusted so that the intake superheat gradually comes within the preset superheat range.

[0063] For example, if the intake superheat of the previous sampling period was 3 and the intake superheat of the current sampling period is 2, then the operating opening of the current sampling period needs to be calculated based on the intake superheat of the current sampling period and the expansion valve opening of the previous sampling period.

[0064] In some embodiments, S230 may include S231-S233:

[0065] S231, determine the first difference between the intake superheat and the target superheat in the current sampling period.

[0066] The target superheat is data pre-stored in the air conditioner's controller, typically 1°C, i.e., 1.

[0067] The intake superheat of the current sampling period is ΔT. k The target superheat is m, and the first difference is e. k That is, e k =ΔTk -m.

[0068] S232, determine the second difference between the intake superheat of the previous sampling period and the target superheat.

[0069] The inhalation superheat of the previous sampling period is ΔT. k-1 The second difference is e k-1 That is, e k-1 =ΔT k-1 -m.

[0070] S233, based on the first difference, the second difference, and the operating opening of the expansion valve in the previous sampling period, determine the operating opening of the expansion valve in the current sampling period.

[0071] Wherein, the operating opening degree of the previous sampling period is P k-1 The new operating degree is P k The new operating degree is P. k =P k-1 +K p (e k -e k-1 )+K i *e k .

[0072] Among them, K p K i These are control coefficients, and the specific values ​​of both differ from the first value by e. k The second difference is e k-1 Related to its K p The specific value selection schemes are shown in the table below:

[0073] <![CDATA[K p ]]> <![CDATA[e k <-1]]> <![CDATA[-1≤e k <0]]> <![CDATA[0≤e k <1.5]]> <![CDATA[1.5<e k ≤3]]> <![CDATA[3<e k ]]> <![CDATA[e k -and k-1 ≤0]]> 5 3 0 2 4 <![CDATA[e k -and k-1 >0]]> 4 2 0 3 5

[0074] Among them, K i The specific value selection schemes are shown in the table below:

[0075] <![CDATA[K i ]]> <![CDATA[e k <-1]]> <![CDATA[-1≤e k <0]]> <![CDATA[0≤e k <1.5]]> <![CDATA[1.5<e k ≤3]]> <![CDATA[3<e k ]]> 3 2 0 2 3

[0076] In some embodiments, before determining whether the intake superheat of the current sampling period is within a preset superheat range, the expansion valve opening control method further includes:

[0077] S201, determine the suction saturation temperature based on the compressor's suction pressure.

[0078] The compressor's suction pressure is the pressure at the compressor's suction port, and the suction saturation temperature is the saturated gas phase temperature corresponding to that suction pressure.

[0079] Wherein, the intake saturation temperature is T 饱和气 The inhalation pressure is P.

[0080] Among them, T 饱和气 =a1*P 4 +a2*P 3 +a3*P 2 +a4*P+a5, where a1, a2, a3, a4, and a5 are determined based on the average pressure of the non-azeotropic mixed refrigerant.

[0081] If the non-azeotropic refrigerant mixture is a hydrocarbon mixture, then a1 = -0.5321, a2 = 5.8444, a3 = -25.955, a4 = 71.174, a5 = -36.705.

[0082] That is, T 饱和气 = -0.5321*P 4 +5.8444*P 3 -25.955*P 2 +71.174*P-36.705.

[0083] S202, determine the suction superheat based on the compressor's suction temperature and suction saturation temperature.

[0084] Once the intake saturation temperature is determined, the intake superheat is: ΔT 过热度 =T 吸气 -T 饱和气 .

[0085] In some embodiments, S100, determining the initial target opening degree of the expansion valve according to the air conditioner operating conditions includes:

[0086] S110 determines the refrigerant compensation opening degree based on the compressor operating conditions and expansion valve operating conditions.

[0087] The refrigerant compensation opening is ΔP1, which is generally affected by the compressor operating conditions and the expansion valve operating conditions. Therefore, the refrigerant compensation opening ΔP1 can be changed according to the compressor operating conditions and the expansion valve operating conditions.

[0088] S120, determine the initial target opening degree based on the refrigerant compensation opening degree and the basic initial opening degree.

[0089] Wherein, the basic initial opening degree is P0, and the initial target opening degree is P1, then P1=P0+ΔP1. Since the basic initial opening degree is related to the set temperature, the operating windshield, the indoor temperature, the outdoor temperature and the exhaust temperature, and the refrigerant compensation opening degree is also related to the compressor operating condition and the expansion valve operating condition, the initial target opening degree is not fixed, but is updated in real time according to the actual operating conditions.

[0090] In some embodiments, S110, determining the refrigerant compensation opening degree based on the compressor operating conditions and the expansion valve operating conditions includes:

[0091] S111, based on the compressor's operating conditions, determine the compressor's highest and lowest operating frequencies under the current operating conditions.

[0092] The highest operating frequency of the compressor under the current operating conditions is f. max The minimum operating frequency is f min It is related to the current operating condition of the compressor.

[0093] S112, based on the operating conditions of the expansion valve, determine the maximum and minimum operating opening of the expansion valve under the current operating conditions.

[0094] The maximum operating opening of the expansion valve under the current operating conditions is P. max The minimum operating opening is P min It is related to the current operating condition of the expansion valve.

[0095] S113, the refrigerant compensation opening is determined based on the highest operating frequency, lowest operating frequency, maximum operating opening degree, and minimum operating opening degree.

[0096] Among them, the refrigerant compensation opening degree is Where f is the compressor's current operating frequency; A is a correction factor, which is 0.2 when the air conditioner is in cooling mode and 0.3 when the air conditioner is in heating mode.

[0097] The highest operating frequency is f max The minimum operating frequency is f min The value of f is generally determined based on the current outdoor ambient temperature. max f min The reference table for the values ​​is shown below:

[0098]

[0099] Wherein, the minimum operating opening is P min The value of P is generally determined based on the current outdoor ambient temperature and the compressor's operating frequency. min The reference table for the values ​​is shown below:

[0100]

[0101] The maximum operating opening is P. max The value of P is generally determined based on the current outdoor ambient temperature and the compressor's operating frequency. max The reference table for the values ​​is shown below:

[0102]

[0103]

[0104] In some embodiments, S120, before determining the initial target opening based on the refrigerant compensation opening and the basic initial opening, the expansion valve opening control method further includes:

[0105] Determine the initial opening of the foundation based on the set temperature, operating windshield, indoor temperature, outdoor temperature, and exhaust temperature.

[0106] Wherein, the exhaust temperature is T 排气 The indoor temperature is T 室内 The outdoor temperature is T 室外 Set temperature as T 设定 The operating windshield is actually the rotational speed of the indoor fan.

[0107] Right now,

[0108] Where m is the correction coefficient for the windshield. The higher the windshield, the larger m is. For example, if the air conditioner has five settings: silent mode, low windshield, medium windshield, high windshield, and powerful mode, then m = 30 for silent mode, m = 35 for low windshield, m = 40 for medium windshield, m = 45 for high windshield, and m = 50 for powerful mode.

[0109] In some embodiments, the present invention also provides an expansion valve opening control device 10, including an acquisition module 100, an open-loop control module 200, and a closed-loop control module 300. The acquisition module 100 is used to acquire the real-time opening degree of the expansion valve, the operating time of the air conditioner, and the exhaust temperature. The open-loop control module 200 is used to determine the initial target opening degree of the expansion valve according to the air conditioner's operating conditions after the air conditioner is started, and control the expansion valve to operate in an open-loop manner at the initial target opening degree. The closed-loop control module 300 is used to determine the operating opening degree of the expansion valve according to the compressor's suction superheat after the air conditioner has operated in an open-loop manner at the initial target opening degree for a preset time or the compressor's exhaust temperature is greater than or equal to a preset exhaust temperature, and control the expansion valve to operate in a closed-loop manner at the operating opening degree, so that the compressor's suction superheat is within a preset superheat range.

[0110] In some embodiments, the present invention also provides an air conditioner, which may include components such as a processor 601 with one or more processing cores, a memory 602 with one or more computer-readable storage media, a power supply 603, and an input unit 604. Those skilled in the art will understand that the above-described structure of the air conditioner does not constitute a limitation on the air conditioner, and it may include more or fewer components, or combine certain components, or have different component arrangements. Wherein:

[0111] The processor 601 is the controller of the air conditioner, connecting various parts of the air conditioner through various interfaces and lines. It performs various functions and processes data by running or executing software programs and / or modules stored in the memory 602, and by calling data stored in the memory 602, thereby providing overall monitoring of the air conditioner. Optionally, the processor 601 may include one or more processing cores; preferably, the processor 601 may integrate an application processor 601 and a modem processor 601, wherein the application processor 601 mainly handles the operating system, user interface, and computer programs, while the modem processor 601 mainly handles wireless communication. It is understood that the modem processor 601 may also not be integrated into the processor 601.

[0112] The memory 602 can be used to store software programs and modules. The processor 601 executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, computer programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the server, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory may also include a memory controller to provide the processor 601 with access to the memory.

[0113] The air conditioner also includes a power supply 603 that supplies power to various components. Preferably, the power supply 603 can be logically connected to the processor 601 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply may also include one or more DC or AC power supplies, a recharging system, a power fault detection circuit, a power converter or inverter, a power status indicator, or any other components.

[0114] The air conditioner may also include an input unit 604, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0115] Although not shown, the air conditioner may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 601 in the air conditioner loads the executable files corresponding to the processes of one or more computer programs into the memory 602 according to the following instructions, and the processor 601 runs the computer programs stored in the memory 602 to perform the following steps:

[0116] After the air conditioner is started, the initial target opening of the expansion valve is determined according to the air conditioner's operating conditions, and the expansion valve is controlled to operate in open loop at the initial target opening.

[0117] After the air conditioner operates at the initial target opening for a preset time or the compressor's exhaust temperature is greater than or equal to the preset exhaust temperature, the operating opening of the expansion valve is determined based on the compressor's suction superheat, and the expansion valve is controlled to operate in a closed loop at the operating opening to ensure that the compressor's suction superheat is within the preset superheat range.

[0118] By performing the above steps, the expansion valve is first controlled to operate in an open loop at the initial target opening degree according to the air conditioner's operating conditions. Then, the operating opening degree of the expansion valve is determined based on the suction superheat. The air conditioner is then controlled to operate in a closed loop at the operating opening degree. This keeps the suction superheat of the non-azeotropic refrigerant mixture at a suitable level, allowing different components in the non-azeotropic refrigerant mixture to operate in a boiling state within the evaporator, thus resulting in higher energy efficiency of the non-azeotropic refrigerant mixture.

[0119] Those skilled in the art will understand that all or part of the steps in any of the methods in the above embodiments can be performed by a computer program or by a computer program controlling related hardware. The computer program can be stored in a computer-readable storage medium and loaded and executed by the processor 601.

[0120] In some embodiments, the present invention also provides a storage medium storing a computer program, which is loaded by a processor to perform the following steps;

[0121] After the air conditioner is started, the initial target opening of the expansion valve is determined according to the air conditioner's operating conditions, and the expansion valve is controlled to operate in open loop at the initial target opening.

[0122] After the air conditioner operates at the initial target opening for a preset time or the compressor's exhaust temperature is greater than or equal to the preset exhaust temperature, the operating opening of the expansion valve is determined based on the compressor's suction superheat, and the expansion valve is controlled to operate in a closed loop at the operating opening to ensure that the compressor's suction superheat is within the preset superheat range.

[0123] By performing the above steps, the expansion valve is first controlled to operate in an open loop at the initial target opening degree according to the air conditioner's operating conditions. Then, the operating opening degree of the expansion valve is determined based on the suction superheat. The air conditioner is then controlled to operate in a closed loop at the operating opening degree. This keeps the suction superheat of the non-azeotropic refrigerant mixture at a suitable level, allowing different components in the non-azeotropic refrigerant mixture to operate in a boiling state within the evaporator, thus resulting in higher energy efficiency of the non-azeotropic refrigerant mixture.

[0124] It will be understood by those skilled in the art that any references to memory, storage, database, or other media used in the embodiments provided by this invention may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0125] Since the computer program stored in the storage medium can execute the steps in the air conditioner expansion valve opening control method in any embodiment of the present invention, the beneficial effects that the air conditioner expansion valve opening control method in any embodiment of the present invention can achieve can be realized, as detailed in the preceding embodiments, and will not be repeated here.

[0126] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0127] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0128] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the application concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for controlling the opening degree of an expansion valve, characterized in that, A method for controlling the opening degree of an expansion valve in an air conditioner, wherein the air conditioner uses a non-azeotropic refrigerant mixture, includes: After the air conditioner is started, the initial target opening degree of the expansion valve is determined according to the operating conditions of the air conditioner, and the expansion valve is controlled to operate in open loop at the initial target opening degree. After the air conditioner operates in open loop at the initial target opening degree for a preset time or the compressor's exhaust temperature is greater than or equal to the preset exhaust temperature, the operating opening degree of the expansion valve is determined based on the compressor's suction superheat, and the expansion valve is controlled to operate in closed loop at the operating opening degree so that the compressor's suction superheat is within the preset superheat range. Determining the operating opening degree of the expansion valve based on the suction superheat of the compressor includes: Determine whether the intake superheat of the previous sampling period is within the preset superheat range; When it is determined that the intake superheat in the previous sampling period is not within the preset superheat range, the operating opening of the expansion valve in the current sampling period is determined based on the intake superheat in the current sampling period, the intake superheat in the previous sampling period, and the operating opening of the expansion valve in the previous sampling period. The step of determining the operating opening of the expansion valve in the current sampling period based on the intake superheat of the current sampling period, the intake superheat of the previous sampling period, and the operating opening of the expansion valve in the previous sampling period includes: Determine the first difference between the intake superheat and the target superheat in the current sampling period; Determine a second difference between the intake superheat and the target superheat from the previous sampling period; Based on the first difference, the second difference, and the operating opening of the expansion valve in the previous sampling period, the operating opening of the expansion valve in the current sampling period is determined. Determined based on the first difference and the second difference. , ; , The control coefficient is the first difference. The second difference is ; in, The operating opening degree of the previous sampling period was The current sampling period's operating opening is .

2. The expansion valve opening control method according to claim 1, characterized in that, Determining the operating opening degree of the expansion valve based on the suction superheat of the compressor includes: When it is determined that the intake superheat in the previous sampling period is within the preset superheat range, the operating opening of the expansion valve in the previous sampling period is taken as the operating opening of the expansion valve in the current sampling period.

3. The expansion valve opening control method according to claim 2, characterized in that, Before determining whether the intake superheat of the current sampling period is within the preset superheat range, the expansion valve opening control method further includes: Determine the suction saturation temperature based on the compressor's suction pressure; The suction superheat is determined based on the compressor's suction temperature and the suction saturation temperature.

4. The expansion valve opening control method according to claim 1, characterized in that, Determining the initial target opening of the expansion valve based on the air conditioner's operating conditions includes: Determine the refrigerant compensation opening based on the compressor operating conditions and expansion valve operating conditions; The initial target opening is determined based on the refrigerant compensation opening and the basic initial opening.

5. The expansion valve opening control method according to claim 4, characterized in that, The process of determining the refrigerant compensation opening based on the compressor operating conditions and expansion valve operating conditions includes: Based on the compressor's operating conditions, determine the compressor's highest and lowest operating frequencies under the current operating conditions; Based on the operating conditions of the expansion valve, determine the maximum and minimum operating opening of the expansion valve under the current operating conditions; The refrigerant compensation opening is determined based on the highest operating frequency, the lowest operating frequency, the maximum operating opening, and the minimum operating opening.

6. The expansion valve opening control method according to claim 4, characterized in that, Before determining the initial target opening based on the refrigerant compensation opening and the basic initial opening, the expansion valve opening control method further includes: The initial opening degree of the foundation is determined based on the set temperature, operating windshield, indoor temperature, outdoor temperature, and exhaust temperature.

7. An expansion valve opening control device, characterized in that, include: The acquisition module is used to acquire the real-time opening degree of the expansion valve, the running time of the air conditioner, and the exhaust temperature; An open-loop control module is used to determine the initial target opening degree of the expansion valve according to the operating conditions of the air conditioner after the air conditioner is started, and to control the expansion valve to operate in open loop at the initial target opening degree. The closed-loop control module is used to determine the operating opening of the expansion valve based on the suction superheat of the compressor after the air conditioner has been running in open loop at the initial target opening for a preset time or the exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature, and to control the expansion valve to run in closed loop at the operating opening so that the suction superheat of the compressor is within the preset superheat range. Determining the operating opening degree of the expansion valve based on the suction superheat of the compressor includes: Determine whether the intake superheat of the previous sampling period is within the preset superheat range; When it is determined that the intake superheat in the previous sampling period is not within the preset superheat range, the operating opening of the expansion valve in the current sampling period is determined based on the intake superheat in the current sampling period, the intake superheat in the previous sampling period, and the operating opening of the expansion valve in the previous sampling period. The step of determining the operating opening of the expansion valve in the current sampling period based on the intake superheat of the current sampling period, the intake superheat of the previous sampling period, and the operating opening of the expansion valve in the previous sampling period includes: Determine the first difference between the intake superheat and the target superheat in the current sampling period; Determine a second difference between the intake superheat and the target superheat from the previous sampling period; Based on the first difference, the second difference, and the operating opening of the expansion valve in the previous sampling period, the operating opening of the expansion valve in the current sampling period is determined. Determined based on the first difference and the second difference. , ; , The control coefficient is the first difference. The second difference is ; in, The operating opening degree of the previous sampling period was The current sampling period's operating opening is .

8. An air conditioner, characterized in that, The air conditioner includes a memory and a processor. The memory stores a computer program, and the processor runs the computer program in the memory to perform the steps in the expansion valve opening control method according to any one of claims 1-6.

9. A storage medium, characterized in that, The storage medium stores a computer program, which is executed and loaded by a processor to perform the steps in the expansion valve opening control method according to any one of claims 1-6.

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