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

Abstract

The invention discloses an expansion valve opening degree control method and device, an air conditioner and a storage medium, and the expansion valve opening degree control method comprises the steps that after the air conditioner is started, the initial target opening degree of an expansion valve is determined according to the working condition of the air conditioner, and the expansion valve is controlled to operate at the initial target opening degree in an open loop mode; after the air conditioner operates for preset time at the initial target opening degree or the exhaust temperature of a compressor is larger than or equal to the preset exhaust temperature, the operation opening degree of an expansion valve is determined according to the suction superheat degree of the compressor, and the expansion valve is controlled to operate at the operation opening degree in a closed-loop mode; according to the method for controlling the opening degree of the expansion valve, the expansion valve is controlled to operate at the initial target opening degree according to the working condition of the air conditioner, then the opening degree of the expansion valve is determined according to the suction superheat degree, the suction superheat degree of the non-azeotropic mixed refrigerant is kept at a proper level, and therefore the energy efficiency of the non-azeotropic mixed refrigerant is high.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner equipment, and in particular to an expansion valve opening control method, device, air conditioner and storage medium. Background Art

[0002] Most of the refrigerants in existing air conditioners are R32 (difluoromethane). As the Kigali Amendment to the Montreal Protocol has included R32 in the list of refrigerants that need to be reduced, it is urgent to find new environmentally friendly refrigerants. Since the current long-term alternative refrigerant R290 (propane) has high requirements for the refrigeration system and is difficult to replace directly, it is particularly important to find long-term alternative refrigerants that can directly replace the R32 system and are environmentally friendly. At present, some new types of mixed hydrocarbon refrigerants have great development potential, but because this non-azeotropic mixed refrigerant has the characteristics of temperature glide, conventional expansion valve control cannot achieve the best heat exchange efficiency. Summary of the invention

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

[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, an initial target opening of the expansion valve is determined according to the working condition of the air conditioner, and the expansion valve is controlled to operate in an open loop at the initial target opening;

[0006] After the air conditioner operates 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, the operating opening of the expansion valve is determined according to the suction superheat of the compressor, 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 of the expansion valve according to the suction superheat of the compressor includes:

[0008] Determining whether the suction air superheat of the previous sampling period is within a preset superheat range;

[0009] When it is determined that the suction superheat of the previous sampling cycle is within the preset superheat range, the operation opening of the expansion valve in the previous sampling cycle is used as the operation opening of the expansion valve in the current sampling cycle;

[0010] 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.

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

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

[0013] determining a second difference between the suction air superheat in the previous sampling period and the target superheat;

[0014] The operating opening degree of the expansion valve in the current sampling period is determined according to the first difference, the second difference and the operating opening degree of the expansion valve in the previous sampling period.

[0015] In some embodiments of the present invention, before determining whether the suction 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 suction pressure of the compressor;

[0017] The suction gas superheat is determined according to the suction gas temperature of the compressor and the suction gas saturation temperature.

[0018] In some embodiments of the present invention, determining the initial target opening of the expansion valve according to the operating condition of the air conditioner includes:

[0019] Determine the refrigerant compensation opening according to the compressor working conditions and the expansion valve working conditions;

[0020] The initial target opening is determined according to the refrigerant compensation opening and the basic initial opening.

[0021] In some embodiments of the present invention, determining the refrigerant compensation opening according to the compressor operating condition and the expansion valve operating condition includes:

[0022] According to the compressor operating condition, determining the maximum operating frequency and the minimum operating frequency of the compressor under the current operating condition;

[0023] According to the expansion valve operating condition, determining the maximum operating opening and the minimum operating opening of the expansion valve under the current operating condition;

[0024] The refrigerant compensation opening is determined according to the maximum operating frequency, the minimum 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 according to the refrigerant compensation opening and the basic initial opening, the expansion valve opening control method further includes:

[0026] Determine the basic initial opening based on the set temperature, operating damper, indoor temperature, outdoor temperature and exhaust temperature.

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

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

[0029] An open-loop control module, for determining an initial target opening of the expansion valve according to the working condition of the air conditioner after the air conditioner is started, and controlling the expansion valve to operate in an open loop at the initial target opening;

[0030] A closed-loop control module is used to determine the operating opening of the expansion valve according to the suction superheat of the compressor after the air conditioner has been operating in an 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 control the expansion valve to operate in a closed-loop at the operating opening so that the suction superheat of the compressor is within a preset superheat range.

[0031] In some embodiments of the present invention, an air conditioner is also provided, which includes a memory and a processor, wherein the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in the above-mentioned expansion valve opening control method.

[0032] In some embodiments of the present invention, a storage medium is further provided, wherein the storage medium stores a computer program, and the computer program is loaded and executed by a processor to execute the steps in the above-mentioned expansion valve opening control method.

[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 mixed refrigerant. The expansion valve opening control method first controls the expansion valve to operate in an open loop at an initial target opening according to the air conditioner operating condition, then determines the operating opening of the expansion valve according to the suction superheat, and then controls the air conditioner to operate in a closed loop at the operating opening, thereby maintaining the suction superheat of the non-azeotropic mixed refrigerant at a relatively appropriate level, so that different components in the non-azeotropic mixed refrigerant can all operate in a boiling state in the evaporator, thereby making the non-azeotropic mixed refrigerant more energy efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of a flow chart of a method for controlling the opening degree of an expansion valve according to an embodiment of the present invention;

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

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

[0038] Figure 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 DESCRIPTION

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

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

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] like Figure 1-Figure 3 As shown, the present invention provides an expansion valve opening control method for controlling an expansion valve in an air conditioner, wherein the air conditioner uses a non-azeotropic mixed refrigerant, and the expansion valve opening control method comprises:

[0044] S100, after the air conditioner is started, an initial target opening of the expansion valve is determined according to the working condition of the air conditioner, and the expansion valve is controlled to operate in an open loop at the initial target opening.

[0045] Among them, the air conditioner operating condition refers to the working status of each component of the air conditioner after the air conditioner is started, such as the operating frequency of the compressor, intake temperature, exhaust temperature and fan speed.

[0046] Among them, since the working condition of the air conditioner is greatly affected by external environmental factors such as indoor temperature and outdoor temperature, 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 runs 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, the operating opening of the expansion valve is determined according to the suction superheat of the compressor, and the expansion valve is controlled to operate in a closed loop at the operating opening so that the suction superheat of the compressor is within the preset superheat range.

[0048] Among them, the air conditioner uses the initial target opening to the preset time or the exhaust temperature of the compressor is greater than or equal to the preset exhaust temperature, in order to enable the air conditioner to quickly reach a more comfortable cooling setting temperature or heating setting temperature. Among them, the specific value of the preset time can be set according to actual needs, and the embodiment of the present application is not limited to this; illustratively, 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. The specific value of the preset exhaust temperature can be set according to actual needs, and the embodiment of the present application is not limited to this; illustratively, the preset time can be set to 50-60℃, such as 50℃, 52℃, 55℃, 57℃, 58℃ or 60℃.

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

[0050] The operating opening of the expansion valve is determined according to the suction superheat of the compressor, with the aim of adjusting the opening of the expansion valve according to the suction superheat, thereby making the suction superheat within a suitable range, so that the air conditioner has a higher energy efficiency for non-azeotropic mixed refrigerant.

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

[0052] 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 mixed refrigerant at the corresponding suction pressure.

[0053] It can be understood that the expansion valve opening control method first controls the expansion valve to operate in an open loop at an initial target opening according to the air conditioner operating condition, then determines the operating opening of the expansion valve according to the suction superheat, and then controls the air conditioner to operate in a closed loop with the operating opening, thereby maintaining the suction superheat of the non-azeotropic mixed refrigerant at a relatively suitable level, so that the different components in the non-azeotropic mixed refrigerant can all operate in a boiling state in the evaporator, thereby making the non-azeotropic mixed refrigerant more energy efficient.

[0054] In some embodiments, S200, determining the operating opening of the expansion valve according to the suction superheat of the compressor includes:

[0055] S210, determining whether the suction air superheat of the previous sampling period is within a preset superheat range.

[0056] Among them, the preset superheat range is the setting range for the suction superheat, which is generally directly stored in the controller of the air conditioner, and its setting 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 mixed refrigerant is higher at this moment.

[0057] S220: When it is determined that the suction 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 suction air superheat of each sampling period is the suction air superheat at the start time of each sampling period.

[0059] Among them, when the suction 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 can keep the non-azeotropic mixed refrigerant of the air conditioner with a better energy efficiency.

[0060] For example, if the suction superheat of the previous sampling cycle is 1, the expansion valve will be kept at the current opening and continue to operate.

[0061] S230, when it is determined that the suction 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 suction superheat of the current sampling cycle, the suction superheat of the previous sampling cycle and the operating opening of the expansion valve in the previous sampling cycle.

[0062] Among them, when the suction superheat of the previous sampling cycle is not within the preset superheat range, it is necessary to adjust the opening of the expansion valve so that the suction superheat gradually falls within the preset superheat range.

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

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

[0065] S231, determining a first difference between the suction air superheat degree in the current sampling period and the target superheat degree.

[0066] The target superheat degree is data pre-stored in the controller of the air conditioner, which is generally 1°C, that is, 1.

[0067] Among them, the suction superheat of the current sampling period is ΔT k , the target superheat is m, the first difference is e k , that is, e k =ΔTk -m.

[0068] S232, determining a second difference between the suction air superheat of the previous sampling period and the target superheat.

[0069] Among them, the suction 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, determining the operating opening of the expansion valve in the current sampling period according to the first difference, the second difference and the operating opening of the expansion valve in the previous sampling period.

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

[0072] Among them, K p , K i is the control coefficient, and the specific value of the two is the first difference is e k The second difference is e k-1 Regarding K p The specific value scheme is shown in the following table:

[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 scheme is shown in the following table:

[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 suction superheat of the current sampling period is within a preset superheat range, the expansion valve opening control method further includes:

[0077] S201, determining the suction saturation temperature according to the suction pressure of the compressor.

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

[0079] Among them, the suction saturation temperature is T 饱和气 ; The suction pressure is P.

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

[0081] If the non-azeotropic mixed refrigerant 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 suction superheat according to the suction temperature and suction saturation temperature of the compressor.

[0084] Among them, after determining the suction saturation temperature, the suction superheat is: ΔT 过热度 =T 吸气 -T 饱和气 .

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

[0086] S110, determining the refrigerant compensation opening according to the compressor working condition and the expansion valve working condition.

[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, determining an initial target opening according to the refrigerant compensation opening and the basic initial opening.

[0089] Among them, the basic initial opening is P0, and the initial target opening is P1, then P1=P0+ΔP1. Since the basic initial opening is related to the set temperature, operating windshield, indoor temperature, outdoor temperature and exhaust temperature, and the refrigerant compensation opening is also related to the compressor operating conditions and the expansion valve operating conditions, the initial target opening 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 according to the compressor working condition and the expansion valve working condition includes:

[0091] S111, determining the maximum operating frequency and the minimum operating frequency of the compressor under the current operating condition according to the compressor operating condition.

[0092] Among them, the maximum operating frequency of the compressor under the current working condition is f max , the minimum operating frequency is f min , which is related to the current operating condition of the compressor.

[0093] S112, determining the maximum operating opening and the minimum operating opening of the expansion valve under the current operating condition according to the operating condition of the expansion valve.

[0094] Among them, the maximum operating opening of the expansion valve under the current working conditions is P max , the minimum operating opening is P min , which is related to the current operating condition of the expansion valve.

[0095] S113, determining the refrigerant compensation opening according to the highest operating frequency, the lowest operating frequency, the maximum operating opening, and the minimum operating opening.

[0096] Among them, the refrigerant compensation opening is Where f is the current operating frequency of the compressor; A is the correction coefficient. When the air conditioner is in cooling mode, A is 0.2; when the air conditioner is in heating mode, A is 0.3.

[0097] Among them, the maximum operating frequency is f max , the minimum operating frequency is f min The value of is generally determined according to the current outdoor ambient temperature. max 、f min The reference table for values ​​is shown in the following table:

[0098]

[0099] Among them, the minimum operating opening is P min The value of is generally determined according to the current outdoor ambient temperature and the compressor operating frequency. min The reference table for values ​​is shown in the following table:

[0100]

[0101] Among them, the maximum operating opening is P max The value of is generally determined according to the current outdoor ambient temperature and the compressor operating frequency. max The reference table for values ​​is shown in the following table:

[0102]

[0103]

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

[0105] Determine the basic initial opening based on the set temperature, operating damper, indoor temperature, outdoor temperature and exhaust temperature.

[0106] The exhaust temperature is T 排气 , the indoor temperature is T 室内 , outdoor temperature is T 室外 , set the temperature to T 设定 , the running windshield is actually the speed of the indoor fan.

[0107] Right now,

[0108] Among them, m is the correction coefficient of the windshield. The higher the windshield, the larger m is. For example, if the air conditioner has five gears: silent gear, low windshield, medium windshield, high windshield and strong windshield, then m=30 for silent gear, m=35 for low windshield, m=40 for medium windshield, m=45 for high windshield and m=50 for strong gear.

[0109] In some embodiments, the present invention further provides an expansion valve opening control device 10, comprising 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 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 of the expansion valve according to the operating conditions of the air conditioner after the air conditioner is started, and control the expansion valve to operate in an open loop with the initial target opening. The closed-loop control module 300 is used to determine the operating opening of the expansion valve according to the suction superheat of the compressor after the air conditioner operates in an open loop with 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 control the expansion valve to operate in a closed loop with the operating opening, so that the suction superheat of the compressor is within a preset superheat range.

[0110] In some embodiments, the present invention further provides an air conditioner, which may include one or more processors 601 of processing cores, one or more computer-readable storage media memories 602, a power supply 603, an input unit 604 and other components. Those skilled in the art will appreciate that the structure of the air conditioner described above does not constitute a limitation on the air conditioner, and may include more or fewer components, or combine certain components, or arrange the components differently. Among them:

[0111] The processor 601 is the controller of the air conditioner, and uses various interfaces and lines to connect various parts of the entire air conditioner. By running or executing software programs and / or modules stored in the memory 602, and calling data stored in the memory 602, the processor 601 performs various functions of the air conditioner and processes data, thereby monitoring the air conditioner as a whole. 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 processes the operating system, user interface and computer programs, etc., and the modem processor 601 mainly processes wireless communications. It is understandable that the above-mentioned modem processor 601 may 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, wherein the program storage area may store an operating system, a computer program required for at least one function (such as a sound playback function, an 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 a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. 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 for supplying power to each component. Preferably, the power supply 603 can be logically connected to the processor 601 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. The power supply can also include any components such as one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, and power status indicators.

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

[0115] Although not shown, the air conditioner may further include a display unit, etc., which will not be described in detail herein. Specifically, in this embodiment, the processor 601 in the air conditioner will load 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 will run 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 working condition of the air conditioner, and the expansion valve is controlled to operate in an open loop at the initial target opening;

[0117] After the air conditioner runs 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, the operating opening of the expansion valve is determined according to the suction superheat of the compressor, and the expansion valve is controlled to operate in a closed loop at the operating opening so that the suction superheat of the compressor is within the preset superheat range.

[0118] By executing the above steps, the expansion valve is first controlled to operate in an open loop with an initial target opening according to the air conditioner operating condition, and then the operating opening of the expansion valve is determined according to the suction superheat, and then the air conditioner is controlled to operate in a closed loop with the operating opening, so that the suction superheat of the non-azeotropic mixed refrigerant is maintained at a relatively appropriate level, so that the different components in the non-azeotropic mixed refrigerant can all operate in a boiling state in the evaporator, thereby making the non-azeotropic mixed refrigerant more energy efficient.

[0119] A person skilled in the art will appreciate that all or part of the steps in any of the methods in the above embodiments may be completed by a computer program, or by controlling related hardware through a computer program. The computer program may be stored in a computer-readable storage medium and loaded and executed by the processor 601.

[0120] In some embodiments, the present invention further provides a storage medium, the storage medium stores a computer program, and the computer program is loaded and executed 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 working condition of the air conditioner, and the expansion valve is controlled to operate in an open loop at the initial target opening;

[0122] After the air conditioner runs 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, the operating opening of the expansion valve is determined according to the suction superheat of the compressor, and the expansion valve is controlled to operate in a closed loop at the operating opening so that the suction superheat of the compressor is within the preset superheat range.

[0123] By executing the above steps, the expansion valve is first controlled to operate in an open loop with an initial target opening according to the air conditioner operating condition, and then the operating opening of the expansion valve is determined according to the suction superheat, and then the air conditioner is controlled to operate in a closed loop with the operating opening, so that the suction superheat of the non-azeotropic mixed refrigerant is maintained at a relatively appropriate level, so that the different components in the non-azeotropic mixed refrigerant can all operate in a boiling state in the evaporator, thereby making the non-azeotropic mixed refrigerant more energy efficient.

[0124] It will be appreciated by those skilled in the art that any reference to memory, storage, database or other medium used in the embodiments provided by the present 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. As an illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synch l ink), DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[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 provided by the present invention, the beneficial effects that can be achieved by the air conditioner expansion valve opening control method in any embodiment provided by the present invention can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0126] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0127] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0128] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, within the application concept of the present invention are included in the patent protection scope of the present invention.

Claims

1. A method for controlling the opening of an expansion valve, characterized in that: Used to control an expansion valve in an air conditioner, the air conditioner uses a non-azeotropic mixed refrigerant, and the expansion valve opening control method includes: After the air conditioner is started, an initial target opening of the expansion valve is determined according to the working condition of the air conditioner, and the expansion valve is controlled to operate in an open loop at the initial target opening; After the air conditioner operates in an 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, the operating opening of the expansion valve is determined according to the suction superheat of the compressor, and the expansion valve is controlled to operate in a closed loop at the operating opening so that the suction superheat of the compressor is within a preset superheat range.

2. The expansion valve opening control method according to claim 1, characterized in that: Determining the operating opening of the expansion valve according to the suction superheat of the compressor includes: Determining whether the suction air superheat of the previous sampling period is within a preset superheat range; When it is determined that the suction superheat of the previous sampling cycle is within the preset superheat range, the operation opening of the expansion valve in the previous sampling cycle is used as the operation opening of the expansion valve in the current sampling cycle; 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.

3. The expansion valve opening control method according to claim 2, characterized in that: Determining the operating opening of the expansion valve in the current sampling period according to the suction superheat in the current sampling period, the suction superheat in the previous sampling period, and the operating opening of the expansion valve in the previous sampling period includes: Determine a first difference between the suction air superheat and the target superheat in the current sampling period; determining a second difference between the suction air superheat in the previous sampling period and the target superheat; The operating opening degree of the expansion valve in the current sampling period is determined according to the first difference, the second difference and the operating opening degree of the expansion valve in the previous sampling period.

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

5. The expansion valve opening control method according to claim 1, characterized in that: Determining the initial target opening of the expansion valve according to the operating condition of the air conditioner comprises: Determine the refrigerant compensation opening according to the compressor working conditions and the expansion valve working conditions; The initial target opening is determined according to the refrigerant compensation opening and the basic initial opening.

6. The expansion valve opening control method according to claim 5, characterized in that: Determining the refrigerant compensation opening according to the compressor working condition and the expansion valve working condition includes: According to the compressor operating condition, determining the maximum operating frequency and the minimum operating frequency of the compressor under the current operating condition; According to the expansion valve operating condition, determining the maximum operating opening and the minimum operating opening of the expansion valve under the current operating condition; The refrigerant compensation opening is determined according to the maximum operating frequency, the minimum operating frequency, the maximum operating opening, and the minimum operating opening.

7. The expansion valve opening control method according to claim 5, characterized in that: Before determining the initial target opening according to the refrigerant compensation opening and the basic initial opening, the expansion valve opening control method further includes: The basic initial opening is determined according to the set temperature, the operating damper, the indoor temperature, the outdoor temperature and the exhaust temperature.

8. An expansion valve opening control device, characterized in that: include: An acquisition module is used to obtain the real-time opening degree of the expansion valve, the operating time of the air conditioner and the exhaust temperature; An open-loop control module, for determining an initial target opening of the expansion valve according to the working condition of the air conditioner after the air conditioner is started, and controlling the expansion valve to operate in an open loop at the initial target opening; A closed-loop control module is used to determine the operating opening of the expansion valve according to the suction superheat of the compressor after the air conditioner has been operating in an 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 control the expansion valve to operate in a closed-loop at the operating opening so that the suction superheat of the compressor is within a preset superheat range.

9. An air conditioner, characterized in that: The air conditioner comprises a memory and a processor, wherein the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in the expansion valve control method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium stores a computer program, and the computer program is loaded and executed by a processor to execute the steps in the expansion valve control method according to any one of claims 1 to 7.

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