Control method and device of air conditioner expansion valve and air conditioner

Abstract

The present application relates to air conditioning technical field, provide a kind of control method, device and air conditioner of air conditioner expansion valve, the control method of air conditioner expansion valve includes: in the case where compressor frequency variation rate meets preset condition, obtains compressor frequency variation proportion;According to compressor frequency variation proportion, same proportion adjustment opening of air conditioner expansion valve is obtained reference opening;After waiting for a predetermined length, reference opening is corrected according to the relevant parameters of air conditioner refrigerant mass flow, determines target opening;Control air conditioner expansion valve to operate with target opening.The present application can be realized when compressor changes rapidly, the accurate regulation of expansion valve opening, make expansion valve opening and compressor frequency adapt, to prevent the liquid strike phenomenon of compressor, ensure that air conditioner can reliably and stably operate.

Description

Technical Field

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

[0002] In related technologies, when the air conditioner compressor rapidly reduces its frequency, the air conditioner expansion valve adjusts slowly, resulting in high low pressure. The liquid refrigerant entering the expansion valve cannot evaporate into a gaseous state and enters the gas-liquid separator. When the liquid refrigerant level is higher than the gas return port of the gas-liquid separator, it will cause a large amount of liquid to return to the compressor. In severe cases, it can cause liquid slugging damage to the compressor, thereby affecting the operation of the air conditioner. Summary of the Invention

[0003] This invention provides a control method, device, and air conditioner for an air conditioner expansion valve, which solves the defect of compressor liquid slugging caused by rapid compressor frequency reduction in related technologies. It realizes that the opening degree of the expansion valve is adapted to the compressor frequency, thereby preventing the compressor from liquid slugging and ensuring the reliable and stable operation of the air conditioner.

[0004] This invention provides a method for controlling an air conditioning expansion valve, comprising:

[0005] Under the condition that the compressor frequency change rate meets the preset conditions, obtain the compressor frequency change ratio;

[0006] Based on the compressor frequency change ratio, the opening of the air conditioner expansion valve is adjusted proportionally to obtain the reference opening.

[0007] After waiting for a preset time, the baseline opening degree is corrected based on the relevant parameters of the air conditioning refrigerant mass flow rate to determine the target opening degree;

[0008] Control the air conditioning expansion valve to operate at the target opening degree.

[0009] According to a control method for an air conditioning expansion valve provided by the present invention, the step of correcting the reference opening degree based on relevant parameters of the air conditioning refrigerant mass flow rate includes:

[0010] Obtain the first ratio of the current compressor suction density to the compressor suction density before the compressor frequency change, the second ratio of the current liquid refrigerant density before the expansion valve to the liquid refrigerant density before the compressor frequency change, and the third ratio of the current pressure difference across the expansion valve to the pressure difference across the expansion valve before the compressor frequency change.

[0011] Based on the first ratio, the second ratio, and the third ratio, a correction coefficient is determined, and the reference opening is corrected according to the correction coefficient.

[0012] According to a control method for an air conditioning expansion valve provided by the present invention, the step of determining a correction coefficient based on a first ratio, a second ratio, and a third ratio, and correcting the reference opening degree based on the correction coefficient, includes:

[0013] LEV1 = K × LEV0;

[0014]

[0015] Where LEV0 is the baseline opening, LEV1 is the target opening, K is the correction coefficient, A is the first ratio, B is the second ratio, and C is the third ratio.

[0016] A control method for an air conditioning expansion valve provided by the present invention further includes:

[0017] Obtain the low-pressure reading of the air conditioner;

[0018] Obtain the air intake temperature of the air conditioner;

[0019] The compressor suction density is obtained based on the air conditioner's low-pressure and suction temperature.

[0020] A control method for an air conditioning expansion valve provided by the present invention further includes:

[0021] Obtain the temperature before the expansion valve;

[0022] Obtain the high-pressure reading of the air conditioner;

[0023] The density of the liquid refrigerant before the expansion valve is obtained based on the temperature before the expansion valve and the high pressure of the air conditioner.

[0024] A control method for an air conditioning expansion valve provided by the present invention further includes:

[0025] Obtain the high-pressure reading of the air conditioner;

[0026] Obtain the low-pressure reading of the air conditioner;

[0027] The pressure difference across the expansion valve is obtained based on the high-pressure and low-pressure of the air conditioner.

[0028] The control method for an air conditioning expansion valve provided by the present invention further includes:

[0029] When the compressor frequency change rate does not meet the preset conditions, obtain the air conditioner suction superheat.

[0030] The opening degree of the air conditioner expansion valve is controlled according to the air conditioner intake superheat.

[0031] According to a method for controlling an air conditioning expansion valve provided by the present invention, the step of controlling the opening degree of the air conditioning expansion valve based on the air conditioning intake superheat includes:

[0032] If the air conditioner intake superheat is determined to be less than a preset value, the opening of the air conditioner expansion valve is reduced.

[0033] If the air conditioner intake superheat is determined to be greater than a preset value, the opening of the air conditioner expansion valve is increased.

[0034] The air conditioner intake superheat is determined to be equal to a preset value, and the opening of the air conditioner expansion valve is kept constant.

[0035] The present invention also provides a control device for an air conditioning expansion valve, comprising:

[0036] The acquisition module is used to acquire the compressor frequency change ratio when the compressor frequency change rate meets preset conditions.

[0037] The adjustment module is used to adjust the opening of the air conditioning expansion valve proportionally according to the compressor frequency change ratio to obtain a reference opening.

[0038] The correction module is used to correct the reference opening degree based on the relevant parameters of the air conditioning refrigerant mass flow rate after waiting for a preset time, and to determine the target opening degree.

[0039] The control module is used to control the air conditioning expansion valve to operate at the target opening degree.

[0040] The present invention also provides an air conditioner, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described air conditioning expansion valve control method.

[0041] The present invention provides a method, device, and air conditioner for controlling an air conditioning expansion valve. When the compressor frequency change rate meets a preset condition (i.e., when the compressor frequency changes rapidly), the method obtains the compressor frequency change ratio and adjusts the opening of the air conditioning expansion valve proportionally to obtain a reference opening. Then, after waiting for a preset time, the reference opening is corrected based on relevant parameters of the air conditioning refrigerant mass flow rate to determine the target opening. The air conditioning expansion valve is then controlled to operate at the target opening. Therefore, the present invention can achieve precise adjustment of the expansion valve opening when the compressor frequency changes rapidly by correcting the initially obtained reference opening, making the expansion valve opening adapt to the compressor frequency, thereby preventing liquid slugging in the compressor and ensuring reliable and stable operation of the air conditioner. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is one of the flowcharts illustrating the control method for the air conditioning expansion valve provided by the present invention;

[0044] Figure 2 This is the second flowchart illustrating the control method for the air conditioning expansion valve provided by the present invention;

[0045] Figure 3 This is the third flowchart illustrating the control method for the air conditioning expansion valve provided by the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the control device for the air conditioning expansion valve provided by the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of the air conditioner provided by the present invention.

[0048] Figure label:

[0049] 410: Acquisition module; 420: Adjustment module;

[0050] 430: Correction module; 440: Control module;

[0051] 510: Processor; 520: Communication interface;

[0052] 530: Memory; 540: Communication bus. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0054] In the description of the embodiments of the present invention, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] The following is combined with Figures 1-5 The present invention describes a control method, apparatus, and air conditioner for an air conditioning expansion valve.

[0057] According to an embodiment of the first aspect of the present invention, referring to Figure 1 As shown, the control method for the air conditioning expansion valve provided by the present invention mainly includes the following steps:

[0058] S100. Under the condition that the compressor frequency change rate meets the preset conditions, obtain the compressor frequency change ratio.

[0059] Specifically, the compressor frequency change rate can be understood as the amount of change in the compressor frequency within a certain period of time. For example, the compressor frequency decreases by more than 20Hz within 30 seconds. The compressor frequency change ratio can be understood as the ratio of the compressor frequency after a certain change time to the compressor frequency before the change. For example, the compressor frequency decreases by 1 / 2 after 30 seconds.

[0060] S200: Adjust the opening of the air conditioning expansion valve proportionally according to the compressor frequency change ratio to obtain the reference opening.

[0061] S300: After waiting for the preset time, the reference opening degree is corrected according to the relevant parameters of the air conditioning refrigerant mass flow rate to determine the target opening degree.

[0062] S400 controls the air conditioning expansion valve to operate at the target opening degree.

[0063] Specifically, when the compressor frequency changes, the refrigerant mass flow rate also changes. The opening of the air conditioning expansion valve is adjusted according to the relevant parameters of the refrigerant mass flow rate. In actual operation, if the compressor frequency change rate is detected to meet the preset conditions, it means that the compressor frequency is changing rapidly. Because the compressor frequency changes rapidly, while the relevant parameters of the refrigerant mass flow rate are lagging and change slowly, they cannot keep up with the compressor frequency in real time. As a result, the opening of the expansion valve cannot accurately adapt to the compressor frequency change, leading to low adjustment accuracy of the expansion valve opening.

[0064] Therefore, this invention first adjusts the opening of the air conditioning expansion valve proportionally to the compressor frequency change ratio after a rapid change in compressor frequency, obtaining a preliminary reference opening. For example, if the compressor frequency decreases by 1 / 2, the opening of the air conditioning expansion valve is adjusted to decrease to 1 / 2 of its original opening. Then, after waiting for a certain period of time, such as 10-30 seconds, the relevant parameters of the air conditioning refrigerant mass flow rate are adjusted to a stable state that matches the changed compressor frequency. Finally, the reference opening is corrected based on the current relevant parameters of the air conditioning refrigerant mass flow rate, thereby accurately obtaining the target opening of the expansion valve and controlling the expansion valve to operate at the target opening.

[0065] Therefore, the air conditioning expansion valve control method provided in this embodiment of the invention can achieve precise adjustment of the expansion valve opening when the compressor changes rapidly. This is achieved by designing a reference opening and subsequently correcting the initially obtained reference opening, so that the expansion valve opening is adapted to the compressor frequency, thereby preventing liquid slugging in the compressor and ensuring reliable and stable operation of the air conditioner.

[0066] According to one embodiment of the present invention, referring to Figure 2 As shown, the steps for determining the target opening degree by correcting the baseline opening degree based on relevant parameters of the air conditioning refrigerant mass flow rate after waiting for a preset time include:

[0067] S301. Obtain the first ratio of the current compressor suction density to the compressor suction density before the compressor frequency change, the second ratio of the current liquid refrigerant density before the expansion valve to the liquid refrigerant density before the compressor frequency change, and the third ratio of the current pressure difference across the expansion valve to the pressure difference across the expansion valve before the compressor frequency change.

[0068] It is understood that the relevant parameters of the air conditioning refrigerant mass flow rate of this invention include: compressor suction density, liquid refrigerant density before the expansion valve, and pressure difference before and after the expansion valve.

[0069] S032. Determine the correction coefficient based on the first ratio, the second ratio, and the third ratio, and correct the reference opening based on the correction coefficient to obtain the target opening.

[0070] The specific steps for correction include:

[0071] LEV1 = K × LEV0;

[0072]

[0073] Right now,

[0074] Where LEV0 is the baseline opening, LEV1 is the target opening, K is the correction coefficient, A is the first ratio, B is the second ratio, and C is the third ratio.

[0075] According to one embodiment of the present invention, the air conditioner mainly includes: a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, and an expansion valve. The compressor's discharge port and suction port are respectively connected to the four-way valve, the indoor heat exchanger and the outdoor heat exchanger are respectively connected to the four-way valve, and the indoor heat exchanger and the outdoor heat exchanger are connected via the expansion valve to form a refrigerant circulation system.

[0076] Furthermore, the compressor suction density can be obtained from the air conditioner's low-pressure and suction temperature. The air conditioner's low-pressure is the refrigerant pressure between the compressor's suction port and the four-way valve; the air conditioner's suction temperature is the refrigerant temperature between the compressor's suction port and the four-way valve; the compressor suction density is the refrigerant density at the compressor's suction port, which can be obtained by looking up a table using the low-pressure and suction temperature. The lookup method is common industry knowledge and will not be elaborated here.

[0077] The density of the liquid refrigerant before the expansion valve can be obtained from the temperature before the expansion valve and the high-pressure pressure of the air conditioner. The temperature before the expansion valve is the refrigerant temperature at the inlet of the expansion valve, and the high-pressure pressure of the air conditioner is the refrigerant pressure between the compressor discharge port and the four-way valve; the density of the liquid refrigerant before the expansion valve is the refrigerant density at the inlet of the expansion valve, which can be obtained by looking up a table using the temperature before the expansion valve and the high-pressure pressure. The lookup method is common industry knowledge and will not be elaborated here.

[0078] The pressure difference across the expansion valve can be obtained from the high-pressure and low-pressure readings of the air conditioner. This pressure difference is the difference in refrigerant pressure between the inlet and outlet of the expansion valve, and can be derived from the difference between the high-pressure and low-pressure readings.

[0079] Therefore, by comprehensively considering multiple relevant parameters affecting the opening degree of the air conditioning expansion valve and correcting the reference opening degree of the air conditioning expansion valve based on relevant parameters of the stable air conditioning refrigerant mass flow rate after the compressor frequency changes, the target opening degree of the expansion valve can be obtained more comprehensively and accurately. This allows the opening degree of the expansion valve to adapt to the compressor frequency, avoids liquid slugging in the compressor, and ensures reliable and stable operation of the air conditioner.

[0080] According to one embodiment of the present invention, referring to Figure 3As shown, the control method for the air conditioning expansion valve provided in this embodiment of the invention mainly includes the following steps:

[0081] S110, Detect the rate of change of compressor frequency.

[0082] S120. Determine whether the compressor frequency change rate meets the preset conditions. If it does, proceed to step S100. If it does not, proceed to step S130.

[0083] S100. Under the condition that the compressor frequency change rate meets the preset conditions, obtain the compressor frequency change ratio.

[0084] S200: Adjust the opening of the air conditioning expansion valve proportionally according to the compressor frequency change ratio to obtain the reference opening.

[0085] S300: After waiting for the preset time, the reference opening degree is corrected according to the relevant parameters of the air conditioning refrigerant mass flow rate to determine the target opening degree.

[0086] S400 controls the air conditioning expansion valve to operate at the target opening degree.

[0087] The specific details of steps S100-S400 are as described in the aforementioned embodiments and will not be repeated here.

[0088] S130. When the compressor frequency change rate does not meet the preset conditions, that is, when the compressor frequency changes normally, obtain the air conditioning suction superheat.

[0089] S140. Control the opening degree of the air conditioner expansion valve according to the air conditioner intake superheat.

[0090] Specifically, the detected air conditioning intake superheat is compared with a preset value. If the air conditioning intake superheat is less than the preset value, the opening of the air conditioning expansion valve is reduced; if the air conditioning intake superheat is greater than the preset value, the opening of the air conditioning expansion valve is increased; if the air conditioning intake superheat is equal to the preset value, the opening of the air conditioning expansion valve remains unchanged.

[0091] Therefore, the air conditioning expansion valve control method provided in this embodiment of the invention can accurately adjust the opening of the air conditioning expansion valve under normal and rapid changes in compressor frequency, thereby adapting to different operating conditions and ensuring reliable and stable operation of the air conditioner.

[0092] The control method for the air conditioning expansion valve provided by this invention is described below with reference to a specific example, mainly including:

[0093] (1) Detect the rate of change of compressor frequency;

[0094] (2) When the compressor frequency change rate is detected to meet the preset condition and rapidly decrease by 1 / 2, the expansion valve opening can be reduced proportionally to 1 / 2 LEV, where LEV is the expansion valve opening before the compressor frequency change, and 1 / 2 LEV is the reference opening LEV0. After waiting for 30 seconds, the compressor suction density ρ is obtained based on the air conditioner low-pressure and air conditioner suction temperature, and the ratio of this density to the compressor suction port density before the compressor frequency change is obtained, i.e., the first ratio A. The liquid refrigerant density before the expansion valve is obtained based on the temperature before the expansion valve and the air conditioner high-pressure, and the ratio of this density to the liquid refrigerant density before the compressor frequency change is obtained, i.e., the second ratio B. ΔP is the pressure difference across the expansion valve, which can be obtained by subtracting the air conditioner low-pressure from the air conditioner high-pressure, and the ratio of this pressure difference to the pressure difference before the compressor frequency change is calculated, i.e., the third ratio C. Then, the expansion valve opening is corrected as follows:

[0095]

[0096] Formula for calculating the mass flow rate of refrigerant in air conditioning:

[0097] q m =V h ×f×ρ×η v =C×S×(2×ρ1×△P) 0.5 ;

[0098] Where, q m For mass flow rate, V h Where is the compressor displacement; f is the compressor frequency;

[0099] ρ is the compressor suction density; η v For compressor volumetric efficiency;

[0100] C is the flow coefficient of the expansion valve; S is the flow area of ​​the expansion valve, i.e., the valve opening.

[0101] ρ1 is the density of the liquid refrigerant before the expansion valve; ΔP is the pressure difference before and after the expansion valve.

[0102] From the above formula for calculating mass flow rate, it can be seen that when the compressor frequency f decreases rapidly, the mass flow rate q m It will decrease, but due to the adjustment lag, the relevant parameters ρ, ρ1, and ΔP remain basically unchanged in the short term, because the parameter V h η v If C remains unchanged, then S decreases, which means the valve opening decreases. When the compressor frequency f decreases by 1 / 2, the valve opening LEV decreases to 1 / 2 LEV, which is the reference opening LEV0. After a certain period of time, the relevant parameters ρ, ρ1, and ΔP stabilize. Then, the reference opening is corrected according to the relevant parameters to obtain the target opening of the expansion valve.

[0103] The following describes the derivation process of obtaining the target opening degree of the expansion valve through the modified formula in the embodiments of the present invention, which roughly includes:

[0104] Before the compressor frequency decreases, the expansion valve opening is LEV, or S; the mass flow rate is:

[0105] q m =V h ×f×ρ×η v =C×S×(2×ρ1×△P) 0.5 ;

[0106] After the compressor frequency is reduced by half, the mass flow rate is:

[0107]

[0108]

[0109] As can be seen from the above formula conversion,

[0110]

[0111]

[0112] in, The reference opening is LEV0;

[0113] S′ represents the target opening degree LEV1 of the expansion valve after the compressor frequency changes.

[0114] (3) When the compressor frequency change rate is detected to be not in line with the preset conditions, the opening of the air conditioner expansion valve is controlled according to the air conditioner intake superheat.

[0115] It is understood that the control method of the present invention is also applicable to the compressor frequency increase condition, and the working principle is the same as described above, so it will not be repeated here.

[0116] The control device for the air conditioning expansion valve provided by the present invention is described below. The control device for the air conditioning expansion valve described below can be referred to in correspondence with the control method for the air conditioning expansion valve described above.

[0117] According to an embodiment of the second aspect of the present invention, referring to Figure 4As shown, the present invention also provides a control device for an air conditioning expansion valve, mainly comprising: an acquisition module 410, an adjustment module 420, a correction module 430, and a control module 440. The acquisition module 410 is used to acquire the compressor frequency change ratio when the compressor frequency change rate meets a preset condition; the adjustment module 420 is used to adjust the opening of the air conditioning expansion valve proportionally according to the compressor frequency change ratio to obtain a reference opening; the correction module 430 is used to correct the reference opening based on relevant parameters of the air conditioning refrigerant mass flow rate after waiting for a preset time to determine the target opening; and the control module 440 is used to control the air conditioning expansion valve to operate at the target opening.

[0118] The air conditioning expansion valve control device provided in this embodiment of the invention can accurately adjust the expansion valve opening by correcting the initially obtained reference opening when the compressor changes rapidly, so that the expansion valve opening is adapted to the compressor frequency, thereby preventing liquid slugging in the compressor and ensuring reliable and stable operation of the air conditioner.

[0119] According to an embodiment of the third aspect of the present invention, referring to Figure 5 As shown, the present invention also provides an air conditioner, which may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 can call logic instructions in the memory 530 to execute a control method for the air conditioning expansion valve. The method includes: obtaining the compressor frequency change ratio when the compressor frequency change rate meets a preset condition; adjusting the opening of the air conditioning expansion valve proportionally according to the compressor frequency change ratio to obtain a reference opening; after waiting for a preset time, correcting the reference opening according to relevant parameters of the air conditioning refrigerant mass flow rate to determine a target opening; and controlling the air conditioning expansion valve to operate at the target opening.

[0120] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0121] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method for the air conditioning expansion valve provided by the above methods. The method includes: obtaining the compressor frequency change ratio when the compressor frequency change rate meets a preset condition; adjusting the opening of the air conditioning expansion valve proportionally according to the compressor frequency change ratio to obtain a reference opening; after waiting for a preset time, correcting the reference opening according to relevant parameters of the air conditioning refrigerant mass flow rate to determine a target opening; and controlling the air conditioning expansion valve to operate at the target opening.

[0122] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements a control method for an air conditioning expansion valve provided by the above methods. The method includes: obtaining a compressor frequency change ratio when the compressor frequency change rate meets a preset condition; adjusting the opening of the air conditioning expansion valve proportionally according to the compressor frequency change ratio to obtain a reference opening; after waiting for a preset time, correcting the reference opening according to relevant parameters of the air conditioning refrigerant mass flow rate to determine a target opening; and controlling the air conditioning expansion valve to operate at the target opening.

[0123] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0124] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for an air conditioning expansion valve, characterized in that, include: Under the condition that the compressor frequency change rate meets the preset conditions, obtain the compressor frequency change ratio; Based on the compressor frequency change ratio, the opening of the air conditioner expansion valve is adjusted proportionally to obtain the reference opening. After waiting for a preset time, the baseline opening degree is corrected based on the relevant parameters of the air conditioning refrigerant mass flow rate to determine the target opening degree; Control the air conditioning expansion valve to operate at the target opening degree; The step of correcting the reference opening degree based on relevant parameters of the air conditioning refrigerant mass flow rate includes: Obtain the first ratio of the current compressor suction density to the compressor suction density before the compressor frequency change, the second ratio of the current liquid refrigerant density before the expansion valve to the liquid refrigerant density before the compressor frequency change, and the third ratio of the current pressure difference across the expansion valve to the pressure difference across the expansion valve before the compressor frequency change. Based on the first ratio, the second ratio, and the third ratio, a correction coefficient is determined, and the reference opening is corrected according to the correction coefficient.

2. The control method for the air conditioning expansion valve according to claim 1, characterized in that, The step of determining a correction coefficient based on the first ratio, the second ratio, and the third ratio, and correcting the reference opening based on the correction coefficient, includes: ； ； in, As the reference opening, For the target opening, For correction factor, The first ratio, The second ratio, This is the third ratio.

3. The control method for the air conditioning expansion valve according to claim 1, characterized in that, Also includes: Obtain the low-pressure reading of the air conditioner; Obtain the air intake temperature of the air conditioner; The compressor suction density is obtained based on the air conditioner's low-pressure and suction temperature.

4. The control method for the air conditioning expansion valve according to claim 1, characterized in that, Also includes: Obtain the temperature before the expansion valve; Obtain the high-pressure reading of the air conditioner; The density of the liquid refrigerant before the expansion valve is obtained based on the temperature before the expansion valve and the high pressure of the air conditioner.

5. The control method for the air conditioning expansion valve according to claim 1, characterized in that, Also includes: Obtain the high-pressure reading of the air conditioner; Obtain the low-pressure reading of the air conditioner; The pressure difference across the expansion valve is obtained based on the high-pressure and low-pressure of the air conditioner.

6. The control method for the air conditioning expansion valve according to any one of claims 1-5, characterized in that, Also includes: When the compressor frequency change rate does not meet the preset conditions, obtain the air conditioner suction superheat. The opening degree of the air conditioner expansion valve is controlled according to the air conditioner intake superheat.

7. The control method for the air conditioning expansion valve according to claim 6, characterized in that, The step of controlling the opening degree of the air conditioning expansion valve based on the air conditioning intake superheat includes: If the air conditioner intake superheat is determined to be less than a preset value, the opening of the air conditioner expansion valve is reduced. If the air conditioner intake superheat is determined to be greater than a preset value, the opening of the air conditioner expansion valve is increased. The air conditioner intake superheat is determined to be equal to a preset value, and the opening of the air conditioner expansion valve is kept constant.

8. A control device for an air conditioning expansion valve, characterized in that, include: The acquisition module is used to acquire the compressor frequency change ratio when the compressor frequency change rate meets preset conditions. The adjustment module is used to adjust the opening of the air conditioning expansion valve proportionally according to the compressor frequency change ratio to obtain a reference opening. The correction module is used to correct the reference opening degree based on the relevant parameters of the air conditioning refrigerant mass flow rate after waiting for a preset time, and to determine the target opening degree. The control module is used to control the air conditioning expansion valve to operate at the target opening degree; The step of correcting the reference opening degree based on relevant parameters of the air conditioning refrigerant mass flow rate includes: Obtain the first ratio of the current compressor suction density to the compressor suction density before the compressor frequency change, the second ratio of the current liquid refrigerant density before the expansion valve to the liquid refrigerant density before the compressor frequency change, and the third ratio of the current pressure difference across the expansion valve to the pressure difference across the expansion valve before the compressor frequency change. Based on the first ratio, the second ratio, and the third ratio, a correction coefficient is determined, and the reference opening is corrected according to the correction coefficient.

9. An air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the control method for the air conditioning expansion valve as described in any one of claims 1-7.

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