Method and device for controlling opening degree of electronic expansion valve and air conditioning system

Abstract

The invention relates to the technical field of air conditioners, and provides an electronic expansion valve opening degree control method and device and an air conditioner system.The control method comprises the steps that the opening degree of an electronic expansion valve is adjusted based on a PID control system; under the condition that the opening degree of the electronic expansion valve fluctuates in the current time period, the current target PID parameter of the PID control system is determined based on the maximum valve opening degree and the minimum valve opening degree which are adjacent in the current time period; and adjusting the opening degree of the electronic expansion valve based on the current target PID parameter. According to the method, the opening degree of the electronic expansion valve is adjusted through a PID control system, PID parameters are optimized based on the maximum valve opening degree and the minimum valve opening degree of the current time period when the opening degree of the electronic expansion valve fluctuates, the current target PID parameters are obtained, and then the opening degree of the electronic expansion valve is adjusted based on the current target PID parameters; in this way, by optimizing the regulation and control mode of the electronic expansion valve, fluctuation of the opening degree of the electronic expansion valve can be effectively restrained, and the operation efficiency and stability of the air conditioning system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an electronic expansion valve opening control method, device and air conditioning system. Background Art

[0002] At present, electronic expansion valves (EEVs) are widely used in air-conditioning systems to adjust the refrigerant flow rate in order to achieve precise control of system performance. In practical applications, the opening of the electronic expansion valve is automatically adjusted using the PID (Proportional-Integral-Derivative) method. The PID adjustment principle of the electronic expansion valve opening is to achieve precise adjustment of the refrigerant flow rate through dynamic control of the three links of proportion (P), integration (I), and differentiation (D), thereby optimizing system performance (such as superheat, evaporator efficiency, etc.). The PID control logic is usually based on dynamic calculations of multiple parameters such as exhaust temperature, indoor and outdoor coil temperature, compressor frequency, external loop temperature, etc., and is calculated in combination with preset fixed constants to achieve the purpose of automatically adjusting the valve opening, thereby optimizing the operating efficiency and stability of the system. However, in actual operation, the PID control method can cause the electronic expansion valve opening to enter a periodic fluctuation state under certain operating conditions. This in turn causes key parameters such as exhaust temperature and system power to fluctuate continuously, making it difficult to converge to a stable state. This periodic fluctuation not only affects the operating efficiency of the air conditioning system but also may reduce equipment reliability. Summary of the Invention

[0003] The present invention provides an electronic expansion valve opening control method, device and air-conditioning system, which are used to solve the problem that the electronic expansion valve opening is prone to periodic fluctuations and difficult to converge under the existing PID control method. By optimizing the control method of the electronic expansion valve, the fluctuation of key parameters such as exhaust temperature and system power can be reduced, ensuring the precise regulation of refrigerant flow, thereby improving the operating efficiency and stability of the air-conditioning system.

[0004] The present invention provides an electronic expansion valve opening control method, comprising: Adjust the opening of the electronic expansion valve based on the PID control system; In the case of fluctuations in the opening of the electronic expansion valve during the current period, determining current target PID parameters of the PID control system based on adjacent maximum and minimum valve openings during the current period; the opening fluctuations at least include a change in the opening cross-sectional area of the electronic expansion valve per unit time; Based on the current target PID parameters, adjust the opening of the electronic expansion valve.

[0005] According to a method for controlling the opening of an electronic expansion valve provided by the present invention, determining the current target PID parameters of the PID control system based on adjacent maximum valve openings and minimum valve openings in a current time period includes: Obtain the adjacent maximum valve opening and minimum valve opening of the current period; determining a target valve opening for the current period based on adjacent maximum valve openings and minimum valve openings for the current period; Based on the target valve opening of the current period, current target PID parameters of the PID control system are determined.

[0006] According to a method for controlling the opening of an electronic expansion valve provided by the present invention, determining a target valve opening for the current period based on adjacent maximum valve openings and minimum valve openings in the current period includes: Determine an average value of adjacent maximum valve openings and minimum valve openings in the current time period; The average value is determined as the target valve opening degree for the current period.

[0007] According to an electronic expansion valve opening control method provided by the present invention, determining the current target PID parameter of the PID control system based on the target valve opening of the current time period includes: Controlling the electronic expansion valve to operate at a target valve opening for a preset time period during the current period; Obtaining operating parameters of the air conditioning system during the current period; the operating parameters include at least one of exhaust temperature, indoor coil temperature, outdoor coil temperature, frequency, and ambient temperature; Based on the operating parameters of the current period and the target valve opening of the current period, current target PID parameters of the PID control system are determined.

[0008] According to a method for controlling the opening of an electronic expansion valve provided by the present invention, before obtaining adjacent maximum valve openings and minimum valve openings in a current period, the method further includes: Obtain the opening degrees of multiple electronic expansion valves in the current period; Based on the difference between the openings of two adjacent electronic expansion valves, an extreme opening is determined, where the extreme opening includes a maximum valve opening in a current period and a minimum valve opening in a current period.

[0009] According to a method for controlling the opening of an electronic expansion valve provided by the present invention, determining the extreme opening based on the difference between the openings of two adjacent electronic expansion valves includes: determining a first difference between an opening degree of an intermediate electronic expansion valve and an opening degree of a next electronic expansion valve; determining a second difference between the opening of the previous electronic expansion valve and the opening of the intermediate electronic expansion valve; When the product of the first difference and the second difference is less than zero, the opening degree of the intermediate electronic expansion valve is determined to be the extreme opening degree.

[0010] According to a method for controlling the opening of an electronic expansion valve provided by the present invention, determining the extreme opening based on the difference between the openings of two adjacent electronic expansion valves includes: When the current three consecutive electronic expansion valve openings meet a preset condition, the middle electronic expansion valve opening among the current three consecutive electronic expansion valve openings is determined as the maximum valve opening or the minimum valve opening of the current period; When the next three consecutive electronic expansion valve openings meet the preset condition, the middle electronic expansion valve opening among the next three consecutive electronic expansion valve openings is determined as the minimum valve opening or the maximum valve opening for the current period.

[0011] According to a method for controlling the opening of an electronic expansion valve provided by the present invention, adjusting the opening of the electronic expansion valve based on the current target PID parameter includes: Adjust the opening of the electronic expansion valve based on the current target PID parameter to obtain the opening of the electronic expansion valve in the next period; In the case where the opening of the electronic expansion valve fluctuates in the next period, determining the PID parameters of the PID control system for the next period based on the adjacent maximum valve opening and minimum valve opening in the next period; Based on the PID parameters of the next period, the opening of the electronic expansion valve is adjusted.

[0012] The present invention also provides an electronic expansion valve opening control device, comprising the following modules: A first regulating module, configured to regulate the opening of the electronic expansion valve based on a PID control system; a determination module configured to determine, when the opening of the electronic expansion valve fluctuates during a current period, current target PID parameters of the PID control system based on adjacent maximum and minimum valve openings during the current period; the opening fluctuation at least comprising a change in the opening cross-sectional area of the electronic expansion valve per unit time; The second regulating module is used to regulate the opening of the electronic expansion valve based on the current target PID parameter.

[0013] The present invention also provides an air conditioning system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above-mentioned electronic expansion valve opening control methods when executing the computer program. The electronic expansion valve opening control method provided by the present invention adjusts the opening of the electronic expansion valve through a PID control system, and when the opening of the electronic expansion valve fluctuates, optimizes the PID parameters based on the maximum valve opening and the minimum valve opening of the current time period to obtain the current target PID parameters, and then adjusts the opening of the electronic expansion valve based on the current target PID parameters; in this way, by optimizing the control method of the electronic expansion valve, the fluctuation of the opening of the electronic expansion valve can be effectively suppressed, thereby reducing the fluctuation of key parameters such as exhaust temperature and system power, thereby improving the operating efficiency and stability of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is one of the flow charts of the electronic expansion valve opening control method provided by the present invention.

[0016] Figure 2 This is the second flow chart of the electronic expansion valve opening control method provided by the present invention.

[0017] Figure 3 This is the third flow chart of the electronic expansion valve opening control method provided by the present invention.

[0018] Figure 4 This is the fourth flow chart of the electronic expansion valve opening control method provided by the present invention.

[0019] Figure 5 This is the fifth flow chart of the electronic expansion valve opening control method provided by the present invention.

[0020] Figure 6 This is the sixth flow chart of the electronic expansion valve opening control method provided by the present invention.

[0021] Figure 7 This is the seventh flow chart of the electronic expansion valve opening control method provided by the present invention.

[0022] Figure 8 It is a schematic diagram of three-way adjustment of the opening of the electronic expansion valve provided by the present invention.

[0023] Figure 9 It is a structural schematic diagram of the electronic expansion valve opening control device provided by the present invention.

[0024] Figure 10It is a structural schematic diagram of the air-conditioning system provided by the present invention. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] The following combination Figures 1-8 The electronic expansion valve opening control method of the present invention is described.

[0027] The embodiment of the present invention provides a method for controlling the opening of an electronic expansion valve. Figure 1 As shown, the method includes the following steps: Step 100: Adjust the opening of the electronic expansion valve based on the PID control system.

[0028] It is understandable that in the air-conditioning system, the opening of the electronic expansion valve is adjusted according to a preset PID control system to adapt to the current load demand.

[0029] The parameters of the preset PID control system (proportional coefficient Kp, integral time Ti, and differential time Td) are typically optimized and determined based on the operating characteristics and historical data of the air conditioning system. Specifically, the initial PID parameter range is set by analyzing the system response under operating conditions (such as key parameters such as exhaust temperature, indoor and outdoor coil temperatures, compressor frequency, and ambient temperature) and combining thermodynamic models and experience. Subsequently, using the system's historical operating data (including indicators such as refrigerant flow, superheat changes, and energy efficiency ratio under different load conditions), parameter tuning methods (such as the critical proportionality method) or optimization algorithms (such as genetic algorithms and particle swarm optimization) are used for offline training. With the objective function of minimizing control deviation (such as superheat fluctuations and adjustment time), the basic PID parameters are automatically optimized, ultimately forming the preset PID control system.

[0030] Step 200: When the opening of the electronic expansion valve fluctuates during the current period, determine the current target PID parameters of the PID control system based on the adjacent maximum valve opening and minimum valve opening during the current period.

[0031] The opening fluctuation at least includes the change in the opening cross-sectional area of the electronic expansion valve within a unit time.

[0032] Step 300: Adjust the opening of the electronic expansion valve based on the current target PID parameters.

[0033] It is understandable that the following problems exist in the actual application of the preset PID control system: (1) sensor delay and temperature detection lag require additional filtering or adjustment of the differential link; (2) valve characteristics and electronic expansion valves (stepper motors) require the PID output to be converted into step pulses; (3) nonlinear and large temperature difference working conditions may require segmented PID parameters; (4) the simple circulation volume calculated based on empirical constants deviates from the actual circulation volume of the system; thus, in the actual operation process, due to factors such as changes in the external environment, system load fluctuations, and sensor delays, the opening of the electronic expansion valve will fluctuate periodically. Based on this, this embodiment monitors the changes in the opening of the electronic expansion valve in real time. When the opening of the electronic expansion valve fluctuates, the adjacent maximum valve opening and minimum valve opening are obtained, and the PID parameters are calculated and optimized based on the maximum valve opening and minimum valve opening to obtain the optimal PID parameters (i.e., the current target PID parameters) suitable for the current working conditions, thereby optimizing the control effect. After the PID parameter optimization is completed, the PID control system with the current target PID parameters is used to accurately adjust the opening of the electronic expansion valve, thereby effectively suppressing the fluctuation of the electronic expansion valve opening, ensuring the precise adjustment of the refrigerant flow, and improving the operating efficiency and stability of the air-conditioning system.

[0034] It should be noted that this embodiment significantly improves the control accuracy and response speed of the electronic expansion valve by dynamically adjusting the PID parameters, and can adapt to different loads and operating conditions to improve energy efficiency, reduce adjustment lag, and ensure that the electronic expansion valve can still maintain optimal performance under complex working conditions, while reducing mechanical wear and extending the service life of the equipment.

[0035] The electronic expansion valve opening control method provided by an embodiment of the present invention adjusts the opening of the electronic expansion valve through a PID control system, and when the opening of the electronic expansion valve fluctuates, optimizes the PID parameters based on the maximum valve opening and the minimum valve opening of the current time period to obtain the current target PID parameters, and then adjusts the opening of the electronic expansion valve based on the current target PID parameters; in this way, by optimizing the control method of the electronic expansion valve, the fluctuation of the opening of the electronic expansion valve can be effectively suppressed, thereby reducing the fluctuation of key parameters such as exhaust temperature and system power, thereby improving the operating efficiency and stability of the air-conditioning system.

[0036] In one embodiment of the present invention, Figure 2 As shown, step 200, based on the adjacent maximum valve opening and minimum valve opening in the current time period, determines the current target PID parameters of the PID control system, which may specifically include the following steps: Step 210: Obtain the adjacent maximum valve opening and minimum valve opening of the current time period.

[0037] Step 220: Determine the target valve opening for the current period based on the maximum valve opening for the current period and the minimum valve opening for the current period.

[0038] Step 230: Determine current target PID parameters of the PID control system based on the target valve opening of the current period.

[0039] It can be understood that in the PID control process of the electronic expansion valve, when it is detected that the valve opening (i.e., the electronic expansion valve opening) of the current period fluctuates and cannot converge, the maximum valve opening and minimum valve opening data of the current period are obtained in real time; based on these two extreme values (maximum valve opening and minimum valve opening), the target valve opening of the current period is determined by calculating their average value or weighted average value, and the target valve opening can reflect the ideal balance point under the current fluctuation state, thereby forcibly correcting the electronic expansion valve opening according to the target valve opening; and optimizing the PID parameters (proportional, integral and differential) of the PID controller based on the target valve opening to obtain the current target PID parameters of the PID control system, and then applying the PID control system with the current target PID parameters to adjust the electronic expansion valve opening, thereby achieving stable control of the electronic expansion valve opening.

[0040] Optional, such as Figure 3 As shown, step 220, based on the maximum valve opening of the current period and the minimum valve opening of the current period, determines the target valve opening of the current period, which may specifically include the following steps: Step 221: Determine the average value of the adjacent maximum valve opening and minimum valve opening in the current time period.

[0041] Step 222: Determine the average value as the target valve opening for the current period.

[0042] It can be understood that the average value of the adjacent maximum valve opening and minimum valve opening in the current period is calculated, and the average value is used as the target valve opening in the current period.

[0043] Optional, such as Figure 4 As shown, step 230, based on the target valve opening of the current period, determines the current target PID parameters of the PID control system, which may specifically include the following steps: Step 231: Control the electronic expansion valve to operate at the target valve opening for a preset time period in the current period.

[0044] Step 232: Obtain operating parameters of the air conditioning system during the current period; the operating parameters include at least one of exhaust temperature, indoor coil temperature, outdoor coil temperature, frequency, and ambient temperature.

[0045] It's important to note that in the PID control process of an air conditioning system's electronic expansion valve, operating parameters refer to key variables related to regulating the valve's opening. These include, but are not limited to, core parameters such as compressor discharge temperature, indoor coil temperature, outdoor coil temperature, compressor operating frequency, and external ambient temperature. These parameters collectively constitute the multi-dimensional input variables of the PID control system. Discharge temperature reflects the state of the system's high-pressure side, indoor and outdoor coil temperatures characterize heat exchange efficiency, compressor frequency indicates system load level, and ambient temperature influences overall operating conditions.

[0046] Step 233: Determine the current target PID parameters of the PID control system based on the operating parameters of the current period and the target valve opening of the current period.

[0047] It can be understood that after determining the target valve opening for the current period, the electronic expansion valve opening is forcibly corrected, that is, the electronic expansion valve is controlled to operate at the target valve opening for the current period for a preset time, such as three minutes; the operating parameters of the air-conditioning system at the target valve opening for the current period are collected, and based on the operating parameters and the target valve opening for the current period, the PID parameters of the PID control system are optimized to obtain the current target PID parameters; the electronic expansion valve performs PID control based on the current target PID parameters.

[0048] Optional, such as Figure 5 As shown, before step 210, obtaining the adjacent maximum valve opening and minimum valve opening of the current time period, the method further includes the following steps: Step 240: Obtain the opening degrees of multiple electronic expansion valves in the current period.

[0049] Step 250: Determine the extreme opening based on the difference between the openings of two adjacent electronic expansion valves. The extreme opening includes the maximum valve opening in the current period and the minimum valve opening in the current period.

[0050] It can be understood that before obtaining the adjacent maximum valve opening and minimum valve opening of the current period, the maximum valve opening of the current period and the minimum valve opening of the current period are determined.

[0051] Specifically, multiple continuous opening values of the electronic expansion valve in the current time period are obtained to form a set of time series data, which is used to reflect the dynamic change trend of the electronic expansion valve in the time period; every three continuous opening values in the sequence data are analyzed and judged, and when they meet the preset conditions (such as showing a trend of first rising and then falling or first falling and then rising), an extreme point (extreme opening) can be identified as the maximum valve opening of the current time period or the minimum valve opening of the current time period; by judging the entire section of data in turn, if another extreme point is identified, it will be used as the minimum valve opening of the current time period and the maximum valve opening of the current time period, providing a basis for the subsequent adjustment of the PID parameters, thereby improving the response accuracy and stability of the control system.

[0052] In one embodiment of the invention, Figure 6 As shown, step 250, determining the extreme opening based on the difference between the openings of two adjacent electronic expansion valves, may specifically include the following steps: Step 251: Determine a first difference between the opening of the intermediate electronic expansion valve and the opening of the next electronic expansion valve.

[0053] Step 252: Determine a second difference between the previous electronic expansion valve opening and the intermediate electronic expansion valve opening.

[0054] Step 253: When the product of the first difference and the second difference is less than zero, determine the opening of the intermediate electronic expansion valve as the extreme opening.

[0055] It can be understood that, among three consecutive electronic expansion valves, the difference between the opening of the middle electronic expansion valve and the opening of the next electronic expansion valve is calculated as the first difference; at the same time, the difference between the opening of the previous electronic expansion valve and the opening of the middle electronic expansion valve is calculated as the second difference; when the product of these two differences is less than zero, it indicates that a change in the trend direction has occurred at the middle opening, that is, from rising to falling or from falling to rising, and thus the middle opening is judged to be an extreme opening, that is, the middle electronic expansion valve opening is determined to be an extreme opening (minimum valve opening or maximum valve opening).

[0056] In one embodiment of the present invention, the opening degrees of multiple electronic expansion valves are expressed as , , ,...... ,when( - )×( - ) < 0, = ; Continue to take value when ( - )×( - ) < 0, = ,at this time , They are the adjacent maximum valve opening and minimum valve opening respectively.

[0057] For example, step 250, determining the extreme opening based on the difference between the openings of two adjacent electronic expansion valves, may specifically include the following: When the current three consecutive electronic expansion valve openings meet the preset conditions, the middle electronic expansion valve opening among the current three consecutive electronic expansion valve openings is determined as the maximum valve opening or the minimum valve opening for the current period.

[0058] When the next three consecutive electronic expansion valve openings meet the preset condition, the middle electronic expansion valve opening among the next three consecutive electronic expansion valve openings is determined as the minimum valve opening or the maximum valve opening for the current period.

[0059] Specifically, the opening degrees of multiple electronic expansion valves in the current period are obtained and recorded as , , ,...... ; Then, three consecutive opening values (such as , , ) is judged, and when it meets the preset change trend conditions, such as increasing first and then decreasing or decreasing first and then increasing, an extreme opening can be identified as the maximum valve opening of the current period or the minimum valve opening of the current period; similarly, at subsequent data points such as , , , when the same or similar preset conditions are met again, the next extreme valve opening can be identified as the minimum valve opening of the current period or the maximum valve opening of the current period.

[0060] In one embodiment of the present invention, Figure 7 As shown, step 300, based on the current target PID parameter, adjust the opening of the electronic expansion valve, which may specifically include the following steps: Step 310: Adjust the opening of the electronic expansion valve based on the current target PID parameter to obtain the opening of the electronic expansion valve for the next period.

[0061] Step 320: When the opening of the electronic expansion valve fluctuates in the next period, the PID parameters of the PID control system for the next period are determined based on the adjacent maximum valve opening and minimum valve opening in the next period.

[0062] Step 330: Adjust the opening of the electronic expansion valve based on the PID parameters of the next period.

[0063] It can be understood that when periodic fluctuations in the electronic expansion valve opening are detected for the current period, the electronic expansion valve opening is forcibly corrected based on the adjacent maximum and minimum valve openings for the current period. The PID parameters are then optimized based on the target valve opening for the current period after the forced correction and the corresponding operating parameters for the current period, resulting in the current target PID parameters. This optimized PID control system is then used to control the electronic expansion valve opening. If fluctuations in the electronic expansion valve opening persist, the electronic expansion valve opening is further forcibly corrected and the PID parameters optimized based on the adjacent maximum and minimum valve openings for the next period, resulting in the PID parameters for the next period. These PID parameters are then applied again to adjust the valve opening. This forced correction of the electronic expansion valve opening and the corresponding PID parameter optimization are repeated until the fluctuations in the electronic expansion valve opening meet preset requirements and stabilize. This approach not only achieves precise control of the refrigerant flow rate but also significantly improves the operating efficiency and stability of the air conditioning system, ensuring that the entire system maintains optimal performance under varying load conditions.

[0064] It should be noted that, when the opening of the electronic expansion valve does not experience periodic fluctuations, the opening of the expansion valve is not forcedly corrected, and the preset PID control system is used to control the opening of the electronic expansion valve.

[0065] In a specific embodiment of the present invention, the electronic expansion valve opening control method of this embodiment specifically includes the following steps: S1. Adjust the opening of the electronic expansion valve according to the preset PID control system.

[0066] S2. Determine whether the opening of the electronic expansion valve fluctuates periodically.

[0067] S3. When the current electronic expansion valve opening fluctuates, obtain the adjacent maximum valve opening and minimum valve opening in the current time period.

[0068] Among them, the adjacent maximum valve opening and minimum valve opening are , .

[0069] S4. Determine the target valve opening for the current period based on the maximum valve opening for the current period and the minimum valve opening for the current period.

[0070] Among them, the target valve opening is recorded as , =( + ) / 2.

[0071] S5. Control the electronic expansion valve to operate at the target valve opening for the current period for a preset time period.

[0072] It is understandable that the opening of the electronic expansion valve is controlled Maintain the pressure for three minutes to make the first forced correction to the opening of the electronic expansion valve.

[0073] S6. Obtain the operating parameters of the air-conditioning system during the current period.

[0074] S7. Determine current target PID parameters of the PID control system based on the operating parameters of the current period and the target valve opening of the current period.

[0075] It can be understood that, based on the target valve opening of the current time period and the corresponding operating parameters, the PID parameters of the PID control system are optimized to obtain the current target PID parameters.

[0076] S8. Perform PID control on the opening of the electronic expansion valve.

[0077] It can be understood that the PID control system using the current target PID parameters performs PID control on the opening of the electronic expansion valve.

[0078] S9. Determine again whether the opening of the electronic expansion valve has periodic fluctuations.

[0079] S10: If the opening of the electronic expansion valve still fluctuates, the opening of the electronic expansion valve is forced to be corrected multiple times using steps S3 to S8 until the fluctuation of the opening of the electronic expansion valve meets the preset requirements and tends to be stable.

[0080] For example, Figure 8 As shown, the electronic expansion valve opening is forced to be corrected three times. Figure 8 Here, a, b, and c represent the first, second, and third forced corrections of the opening, respectively. After three forced corrections, the opening of the electronic expansion valve tends to be stable. It should be noted that the number of forced corrections of the opening of the electronic expansion valve can also be pre-set.

[0081] The electronic expansion valve opening control device provided by the present invention is described below. The electronic expansion valve opening control device described below and the electronic expansion valve opening control method described above can be referenced to each other.

[0082] The embodiment of the present invention further provides an electronic expansion valve opening control device, such as Figure 9 As shown, the control device includes a first adjustment module 910, a determination module 920 and a second adjustment module 930; wherein: The first regulating module 910 is configured to regulate the opening of the electronic expansion valve based on a PID control system.

[0083] The determination module 920 is used to determine the current target PID parameters of the PID control system based on the adjacent maximum valve opening and minimum valve opening in the current period when the opening of the electronic expansion valve fluctuates in the current period.

[0084] The second adjustment module 930 is configured to adjust the opening of the electronic expansion valve based on the current target PID parameter.

[0085] Figure 10 An example of a physical structure diagram of an air conditioning system is shown below. Figure 10 As shown, the air conditioning system may include: a processor 1010, a communications interface 1020, a memory 1030, and a communications bus 1040, wherein the processor 1010, the communications interface 1020, and the memory 1030 communicate with each other via the communications bus 1040. The processor 1010 may invoke logic instructions in the memory 1030 to execute an electronic expansion valve opening control method, which includes: adjusting the electronic expansion valve opening based on a PID control system; if the electronic expansion valve opening fluctuates in a current period, determining a current target PID parameter of the PID control system based on adjacent maximum and minimum valve openings in the current period; and adjusting the electronic expansion valve opening based on the current target PID parameter.

[0086] Furthermore, the logic instructions in the aforementioned memory 1030 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, or the portion that contributes to the prior art, or a portion 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 for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0087] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program 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 electronic expansion valve opening control method provided by the above methods, which includes: adjusting the electronic expansion valve opening based on the PID control system; when the electronic expansion valve opening fluctuates in the current period, determining the current target PID parameters of the PID control system based on the adjacent maximum valve opening and minimum valve opening in the current period; and adjusting the electronic expansion valve opening based on the current target PID parameters.

[0088] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the electronic expansion valve opening control method provided by the above-mentioned methods, the method including: adjusting the electronic expansion valve opening based on a PID control system; when the electronic expansion valve opening fluctuates in the current period, determining the current target PID parameters of the PID control system based on the adjacent maximum valve opening and minimum valve opening in the current period; and adjusting the electronic expansion valve opening based on the current target PID parameters.

[0089] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and 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 may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0090] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion 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, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods of each embodiment or certain portions of the embodiments.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for controlling the opening of an electronic expansion valve, characterized in that: include: Adjust the opening of the electronic expansion valve based on the PID control system; In the case where the opening of the electronic expansion valve fluctuates during the current period, determining the current target PID parameters of the PID control system based on the adjacent maximum valve opening and minimum valve opening during the current period; The opening fluctuation at least includes a change in the opening cross-sectional area of the electronic expansion valve per unit time; Based on the current target PID parameters, adjust the opening of the electronic expansion valve.

2. The electronic expansion valve opening control method according to claim 1, characterized in that: The determining of the current target PID parameters of the PID control system based on the adjacent maximum valve opening and minimum valve opening in the current time period includes: Obtain the adjacent maximum valve opening and minimum valve opening of the current period; determining a target valve opening for the current period based on adjacent maximum valve openings and minimum valve openings for the current period; Based on the target valve opening of the current period, current target PID parameters of the PID control system are determined.

3. The electronic expansion valve opening control method according to claim 2, characterized in that: Determining the target valve opening of the current period based on the adjacent maximum valve opening and minimum valve opening of the current period includes: Determine an average value of adjacent maximum valve openings and minimum valve openings in the current time period; The average value is determined as the target valve opening degree for the current period.

4. The electronic expansion valve opening control method according to claim 2, characterized in that: The determining of the current target PID parameters of the PID control system based on the target valve opening of the current time period includes: Controlling the electronic expansion valve to operate at a target valve opening for a preset time period during the current period; Obtaining operating parameters of the air conditioning system during the current period; the operating parameters include at least one of exhaust temperature, indoor coil temperature, outdoor coil temperature, frequency, and ambient temperature; Based on the operating parameters of the current period and the target valve opening of the current period, current target PID parameters of the PID control system are determined.

5. The electronic expansion valve opening control method according to claim 2, characterized in that: Before obtaining the adjacent maximum valve opening and minimum valve opening of the current time period, the method further includes: Obtain the opening degrees of multiple electronic expansion valves in the current period; Based on the difference between the openings of two adjacent electronic expansion valves, an extreme opening is determined, where the extreme opening includes a maximum valve opening in a current period and a minimum valve opening in a current period.

6. The electronic expansion valve opening control method according to claim 5, characterized in that: The determining of the extreme opening based on the difference between the openings of two adjacent electronic expansion valves includes: determining a first difference between an opening degree of an intermediate electronic expansion valve and an opening degree of a next electronic expansion valve; determining a second difference between the opening of the previous electronic expansion valve and the opening of the intermediate electronic expansion valve; When the product of the first difference and the second difference is less than zero, the opening degree of the intermediate electronic expansion valve is determined to be the extreme opening degree.

7. The electronic expansion valve opening control method according to claim 5, characterized in that: The determining of the extreme opening based on the difference between the openings of two adjacent electronic expansion valves includes: When the current three consecutive electronic expansion valve openings meet a preset condition, the middle electronic expansion valve opening among the current three consecutive electronic expansion valve openings is determined as the maximum valve opening or the minimum valve opening of the current period; When the next three consecutive electronic expansion valve openings meet the preset condition, the middle electronic expansion valve opening among the next three consecutive electronic expansion valve openings is determined as the minimum valve opening or the maximum valve opening for the current period.

8. The method for controlling the opening of an electronic expansion valve according to any one of claims 1 to 7, characterized in that: The adjusting the opening of the electronic expansion valve based on the current target PID parameter includes: Adjust the opening of the electronic expansion valve based on the current target PID parameter to obtain the opening of the electronic expansion valve in the next period; In the case where the opening of the electronic expansion valve fluctuates in the next period, determining the PID parameters of the PID control system for the next period based on the adjacent maximum valve opening and minimum valve opening in the next period; Based on the PID parameters of the next period, the opening of the electronic expansion valve is adjusted.

9. An electronic expansion valve opening control device, characterized in that: include: A first regulating module, configured to regulate the opening of the electronic expansion valve based on a PID control system; a determination module for determining, when the opening of the electronic expansion valve fluctuates in the current period, current target PID parameters of the PID control system based on adjacent maximum valve openings and minimum valve openings in the current period; The opening fluctuation at least includes a change in the opening cross-sectional area of the electronic expansion valve per unit time; The second regulating module is used to regulate the opening of the electronic expansion valve based on the current target PID parameter.

10. An air conditioning system comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the electronic expansion valve opening control method according to any one of claims 1 to 8 is implemented.

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