Electronic expansion valve opening degree adjusting method and device, and electronic device

Abstract

The application relates to the field of electronic expansion valve adjustment of an airplane ground air conditioner, in particular to an electronic expansion valve opening degree adjustment method and device and electronic equipment, the method comprising the following steps: presetting a target value of compressor superheat and presetting an adjustment mode of the electronic expansion valve opening degree; acquiring an actual value of the compressor superheat; selecting the adjustment mode of the electronic expansion valve opening degree according to the target value of the compressor superheat and the actual value of the compressor superheat; and adjusting the electronic expansion valve opening degree according to the adjustment mode of the electronic expansion valve opening degree. The embodiment of the application realizes adjustment of the electronic expansion valve of the airplane ground air conditioner, combines step adjustment and PID adjustment, selects a more suitable adjustment mode under different working requirements, reduces adjustment cost, realizes relatively accurate adjustment, solves problems such as unstable air outlet temperature caused by unstable electronic expansion valve opening degree adjustment, and improves the working efficiency of the airplane ground air conditioner.

Description

Technical Field

[0001] This invention relates to the field of electronic expansion valve adjustment for aircraft ground air conditioning, and more specifically, to an electronic expansion valve opening adjustment method and apparatus, and electronic equipment. Background Technology

[0002] Currently, the throttling devices in domestic aircraft ground air conditioning systems primarily employ electronic expansion valves. These valves utilize PID control based on the target evaporative superheat, using a single set of PID parameters to address adjustments across all scenarios. This approach is suitable for both fixed-frequency and variable-frequency systems. While it provides good adjustment for fixed-frequency systems, for variable-frequency systems, the compressor's variable-frequency control and EEV dynamic PID control result in unstable compressor frequency and EEV opening output. This can lead to occasional negative superheat, sometimes causing liquid return, resulting in significant fluctuations in the unit's outlet air temperature and even unit malfunctions. Therefore, a more refined control strategy is needed to regulate the opening of the electronic expansion valve to ensure system stability and efficiency. Summary of the Invention

[0003] The present invention aims to overcome at least one defect (deficiency) of the prior art and provide an electronic expansion valve opening adjustment method, device, and electronic device to solve the problem of unstable electronic expansion valve opening adjustment.

[0004] According to a first aspect of this application, a method for adjusting the opening degree of an electronic expansion valve is provided. The electronic expansion valve is used in an air conditioning unit, the air conditioning unit including a compressor, an evaporator, and a condenser that form a refrigerant cycle with the electronic expansion valve. The method includes:

[0005] The target value of the compressor superheat and the adjustment method of the electronic expansion valve opening are preset;

[0006] Obtain the actual value of the compressor superheat;

[0007] The adjustment method for the opening of the electronic expansion valve is selected based on the target value of the compressor superheat and the actual value of the compressor superheat;

[0008] The opening of the electronic expansion valve is adjusted according to the adjustment method of the electronic expansion valve opening.

[0009] The electronic expansion valve regulation method can achieve better control of refrigerant flow in the refrigeration system, improve response speed, enhance environmental adaptability, and enable timely diagnosis and maintenance of the refrigeration system's operating performance, thereby optimizing the entire system.

[0010] Optionally, the preset adjustment method for the opening of the electronic expansion valve includes PID control and / or step control.

[0011] The PID control method, implemented through a PID control algorithm, optimizes the system's control effect by adjusting the proportional, integral, and derivative coefficients. It can be applied to many different control systems, including motor control, temperature control, and robot control. A common PID controller relies on this algorithm, automatically adjusting control parameters such as proportional coefficient, integral time, and derivative time based on actual feedback signals and setpoints to achieve better control. Applying PID control to electronic expansion valve opening adjustment enables highly accurate control. The stepper control method utilizes a stepper motor. The angular displacement of the stepper motor is strictly proportional to the number of input pulses and does not accumulate errors. Typically, the accuracy of a stepper motor is 3-5% of the step angle. Stepper motors can achieve open-loop position control; a single pulse signal yields a specified position increment. Compared to traditional DC control systems, this significantly reduces costs and almost eliminates the need for system adjustments, playing a crucial role in electronic expansion valve opening adjustment.

[0012] Optionally, selecting the adjustment method of the opening degree based on the target value of the compressor superheat and the actual value of the compressor superheat includes:

[0013] Obtain the difference between the target value of the compressor superheat and the actual value of the compressor superheat;

[0014] Based on the difference, the target value deviation trend is judged to obtain the judgment result;

[0015] The adjustment method for the opening of the electronic expansion valve is selected based on the judgment result.

[0016] The difference between the target and actual values ​​of compressor superheat plays a crucial role in the refrigeration system. The target difference in suction superheat ensures that the refrigerant entering the compressor is in a vapor state rather than a liquid state, thus preventing wet compression and protecting the compressor from liquid slugging damage. By measuring the actual difference in suction superheat—the temperature difference between the compressor return pipe or evaporator outlet temperature and the corresponding saturation temperature—the expansion valve can automatically adjust its opening, indirectly controlling the liquid supply to the evaporator and effectively managing suction superheat. The difference between the target and actual suction superheat values ​​is essential for ensuring the safe and efficient operation of the refrigeration system. It directly affects the system's refrigeration performance and the compressor's lifespan by controlling the compressor's suction conditions and the expansion valve's opening.

[0017] Optionally, the step of determining the target value deviation trend based on the difference to obtain the judgment result includes:

[0018] A target deviation trend value for the preset overheating degree is defined, wherein the target deviation trend value includes a positive deviation trend value and a negative deviation trend value.

[0019] The target value deviation trend is determined by analyzing the difference based on the positive and negative deviation trend values ​​to obtain the judgment result.

[0020] The target value deviation trend judgment, by comparing the target value deviation with the actual value deviation, enables closed-loop control of the refrigeration system, achieving better correction and stable control. Using target value deviation trend judgment, the actual value of the output is periodically detected and compared with the target value to determine the deviation. This deviation value is then used to generate control adjustments to eliminate the deviation, ensuring the output maintains the target value. This data-driven approach allows for more accurate identification and prediction of potential system problems. A positive deviation represents the absolute value of the deviation exceeding the target value, while a negative deviation represents the absolute value of the deviation failing to reach the target value. Target value deviation trend judgment plays a crucial role in ensuring system stability, optimizing control parameters, improving control accuracy, and facilitating fault diagnosis and performance optimization in refrigeration systems.

[0021] Optionally, selecting the adjustment method for the opening of the electronic expansion valve based on the judgment result includes:

[0022] The judgment results include a first judgment result, a second judgment result, and a third judgment result, specifically:

[0023] The first judgment result is that the difference is less than or equal to the negative deviation trend value, or greater than or equal to the positive deviation trend value;

[0024] Based on the first judgment result, a PID adjustment mode is selected, and the adjustment period corresponding to the PID adjustment mode is the first period;

[0025] The second judgment result is that the difference is less than or equal to the negative deviation trend value, and increases compared to the difference obtained previously;

[0026] Based on the second judgment result, a PID adjustment mode is selected, and the adjustment period corresponding to the PID adjustment mode is the second period;

[0027] The third judgment result is that the difference is greater than or equal to the positive deviation trend value, and decreases compared to the difference obtained previously;

[0028] The PID control method is selected based on the third judgment result, and the control period corresponding to the PID control method is the third cycle.

[0029] The different judgment results correspond to different electronic expansion valve adjustment methods, which helps the electronic expansion valve to adjust under different conditions, achieve precise adjustment, and improve the working efficiency of the refrigeration system.

[0030] Optionally, the electronic expansion valve opening adjustment method further includes:

[0031] Preset variable values;

[0032] The difference range is set according to the variable value, and each difference range corresponds to an electronic expansion valve opening adjustment method;

[0033] Obtain the difference between the target value of the superheat and the actual value of the superheat;

[0034] If the difference is within the difference range, then select the corresponding type of electronic expansion valve opening adjustment method.

[0035] Optionally, each electronic expansion valve opening adjustment method includes the adjustment cycle and adjustment step frequency of PID adjustment and / or step adjustment.

[0036] Each of the electronic expansion valve opening adjustment methods can automatically adjust the opening for different actual operating conditions by setting a specific adjustment method. The specific adjustment method includes adjustment cycle and adjustment step frequency. By setting an appropriate adjustment method, the electronic expansion valve can play its adjustment role, achieve precise control of refrigerant, and adapt to the needs of variable frequency and non-variable frequency systems.

[0037] Optionally, the target value of the preset superheat includes:

[0038] Multiple preset temperature ranges;

[0039] Each temperature range corresponds to a target value for superheat.

[0040] In the process of adjusting the opening of the electronic expansion valve, setting multiple temperature ranges and a target superheat value for each range allows for more precise control of refrigerant flow, ensuring that the superheat remains within the target range. This meets the different operating requirements of the electronic expansion valve, helps to accelerate cooling speed, accurately control temperature, and achieve energy savings. The electronic expansion valve can quickly respond to changes in system load by adjusting the temperature ranges according to actual load demands, achieving more precise temperature control. Setting temperature ranges plays a crucial role in the opening adjustment process of the electronic expansion valve; it not only improves the system's control accuracy and response speed but also contributes to energy savings and expands control functions.

[0041] According to a second aspect of this application, an electronic expansion valve opening adjustment device is provided, comprising:

[0042] The preset module is used to preset the target value of the compressor superheat and the adjustment mode of the electronic expansion valve opening.

[0043] The acquisition module is used to acquire the actual value of the compressor superheat.

[0044] The selection module is used to select the adjustment method of the opening of the electronic expansion valve based on the target value of the superheat and the actual value of the superheat.

[0045] The adjustment module is used to adjust the opening of the electronic expansion valve according to the adjustment method of the electronic expansion valve opening.

[0046] The device enables precise adjustment of the opening of the electronic expansion valve. The preset module presets the target value of the compressor superheat and the adjustment method of the electronic expansion valve opening. Then, the acquisition module acquires the actual value of the compressor superheat, so that the selection module can select the adjustment method of the electronic expansion valve opening based on the target value of the superheat and the actual value of the superheat. After the selection module determines the adjustment method of the electronic expansion valve opening, the adjustment module adjusts the opening of the electronic expansion valve.

[0047] According to a third aspect of this application, an electronic device is provided, comprising:

[0048] Memory, used to store one or more computer programs;

[0049] A processor, when executed by the processor, implements the electronic expansion valve opening adjustment method described in the first aspect above.

[0050] According to a fourth aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the electronic expansion valve opening adjustment method described in the first aspect above.

[0051] Based on any of the above aspects, the electronic expansion valve opening adjustment method, device, electronic device, and computer storage medium provided in this application can achieve precise opening adjustment control of the electronic expansion valve. By presetting the electronic expansion valve opening adjustment method, including adjustment form, adjustment cycle, and adjustment step frequency, the step size of each adjustment can be reduced, avoiding excessive adjustment of the EEV opening at one time, thereby reducing the risk of system over-adjustment and improving system stability and response speed. Simultaneously, by adding target value deviation trend judgment, a buffer can be provided for the reaction time of the NTC sensor and the communication control time of the PLC, reducing the over-adjustment threshold, shortening the valve adjustment time, helping the system respond more smoothly to temperature changes, reducing system oscillations caused by rapid adjustment, and facilitating the selection of a suitable electronic expansion valve opening adjustment method. It also includes preset temperature ranges, allowing selection of the corresponding electronic expansion valve opening adjustment method, which can reduce the impact on compressor output, enabling the system to approach steady-state operation more quickly. The preset electronic expansion valve opening adjustment method can be adjusted according to actual system response and control requirements, improving the adjustment accuracy and response speed of the electronic expansion valve, reducing system over-adjustment, improving energy efficiency, and enhancing system stability. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a flowchart of an electronic expansion valve opening adjustment method provided in this embodiment.

[0054] Figure 2 This is a schematic diagram of the functional modules of an electronic expansion valve opening adjustment device provided in this embodiment.

[0055] Figure 3 This is a schematic diagram of the structure of the electronic device provided in this embodiment. Detailed Implementation

[0056] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this application. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0057] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0059] Currently used throttling devices include thermal expansion valves and electronic expansion valves. Thermal expansion valves primarily rely on a temperature sensor to detect the superheat at the evaporator outlet and adjust their opening accordingly. This adjustment method is relatively simple, but its adjustment accuracy is lower than that of electronic expansion valves. Furthermore, its response speed to system load changes is slower, limiting its application scenarios. Electronic expansion valves suffer from unstable output control; when the parameters of the PID controller (proportional coefficient K) are... p Integration time constant T i Differential time constant T d Improper settings may cause oscillations in the control system, affecting its stability. At the same time, the coordination and coupling between the flow regulation characteristics of the electronic expansion valve and the dynamic characteristics of the refrigeration system requires a suitable control method. Otherwise, the control effect may be poor. The response time of the NTC sensor and the communication control time of the PLC may cause delays in the control signal, thereby affecting the stability and accuracy of PID regulation, causing large fluctuations in the unit's outlet air temperature, or even causing air conditioning unit failure.

[0060] like Figure 1 As shown, this embodiment provides a method for adjusting the opening degree of an electronic expansion valve, which may include the following steps:

[0061] S110. Preset the target value of the compressor superheat and the adjustment method of the electronic expansion valve opening;

[0062] In this embodiment, the preset compressor superheat can be either the suction superheat or the discharge superheat. The target value of the compressor superheat needs to be set according to the performance parameters of each device in the refrigeration system, the actual working requirements, and the working environment. The target value of the superheat ensures that the opening of the electronic expansion valve meets the liquid supply requirements of the evaporator, thereby matching the liquid supply with the evaporation load and achieving overall temperature control. The adjustment method of the preset electronic expansion valve opening includes PID regulation and / or step regulation. It can be step regulation, PID regulation, or a combination of step regulation and PID regulation to form a specific regulation scheme. The regulation method is not specifically limited. The preset electronic expansion valve opening adjustment method also includes a preset temperature range corresponding to the regulation method, regulation form, regulation cycle, and regulation step frequency. The regulation form can be step regulation, PID regulation, or a combination of step regulation and PID regulation. The regulation cycle is the time interval of the step frequency for adjusting the electronic expansion valve opening. The regulation step frequency can be set to a unit regulation step frequency. The adjustment method of the preset electronic expansion valve opening is not specifically limited.

[0063] In one optional implementation, a target value for the compressor superheat is preset. The temperature of the fresh air entering the compressor is divided into small intervals with consistent temperature differences. A target value for superheat is set for each temperature interval. For example: when the fresh air temperature is less than 20°C, the corresponding target value for superheat is N1; when the fresh air temperature is greater than or equal to 20°C and less than 25°C, the corresponding target value for superheat is N1-2; when the fresh air temperature is greater than or equal to 25°C and less than 30°C, the corresponding target value for superheat is N1-4; when the fresh air temperature is greater than or equal to 30°C and less than 35°C, the corresponding target value for superheat is N1-4; when the fresh air temperature is greater than or equal to 35°C and less than 40°C, the corresponding target value for superheat is N1-5; when the fresh air temperature is greater than or equal to 40°C, the corresponding target value for superheat is N1-5. The setting of the target value for compressor superheat is not specifically limited.

[0064] In one optional implementation, the electronic expansion valve opening adjustment method is preset, and the PID adjustment with preset adjustment periods T1 and T2 is preset. The periods T1 and T2 are set according to the actual system performance parameters, and the specific values ​​are not limited.

[0065] In a more preferred implementation, the temperature range corresponding to the electronic expansion valve opening adjustment method is preset, along with the adjustment form, adjustment cycle, and adjustment step frequency. The adjustment form is a combination of step adjustment and PID adjustment. Specifically, based on the difference between the target value and the actual value of the compressor superheat (denoted as ΔT), a superheat difference range variable is set as y, and a corresponding difference range is defined. The unit adjustment step frequency for step adjustment is zP / s, and the step frequency for PID adjustment is... The maximum value is device-defined, while the x value can be set by different models, where x is an integer greater than 1. The adjustment period is t, which can be set independently according to the performance parameters of the refrigeration system. The difference ΔT includes positive and negative deviations, the specific values ​​of which can be set according to the actual performance parameters of the refrigeration system. When ΔT is in a negative deviation, the adjustment of the electronic expansion valve opening is manifested as a reduction in valve opening, which can be understood as closing the valve. That is, when ΔT is in the range of [-y, y], the electronic expansion valve does not adjust and maintains the pre-opening. When ΔT is in the range of [-y-1, -y), the electronic expansion valve closes the valve at a step frequency of z P / s, with an adjustment period of t3. When ΔT is within the range of [-y-2, -y-1), the electronic expansion valve closes at a step frequency of (z+2) P / s, with an adjustment period of t4; when ΔT is within the range of [-y-3, -y-2), the electronic expansion valve closes at a step frequency of (z+6) P / s, with an adjustment period of t5; when ΔT is less than -y-3, the electronic expansion valve adjusts at a step frequency of (z+10) P / s, with an adjustment period of t9 seconds; when ΔT is greater than the preset specific difference range, it will switch to PID control mode for PID adjustment. When switching to PID control, if ΔT is less than -y-3, the electronic expansion valve will perform PID adjustment with a period of T1 or T2. When ΔT is in a positive deviation, the adjustment of the electronic expansion valve opening manifests as increasing the valve opening, which can be understood as opening the valve. Specifically, when ΔT is in the range [-y, y], the electronic expansion valve does not adjust; when ΔT is in the range [y, y+2), the electronic expansion valve opens at a step frequency of zP / s, with an adjustment period of t6. When ΔT is in the range [y+2, y+4), the electronic expansion valve opens at a step frequency of (z+2)P / s, with an adjustment period of t7; when ΔT is in the range [y+4, y+6), the electronic expansion valve opens at a step frequency of (z+6)P / s, with an adjustment period of t8; when ΔT is greater than y+6, the electronic expansion valve limits the opening at a step frequency of (z+10)P / s, with an adjustment period of t. 10 Seconds; when ΔT is greater than the preset specific difference range, it will switch to PID control mode for PID adjustment. When switching to PID control, when ΔT is greater than y+6, the electronic expansion valve will perform PID adjustment with a period of T1 or T2. The adjustment mode includes, but is not limited to, this.

[0066] S120. Obtain the actual value of the compressor superheat.

[0067] In this embodiment, the actual value of the compressor superheat is obtained. This actual value can be either the suction superheat or the discharge superheat. It can be obtained through direct measurement or by calculating the suction superheat based on the actual suction temperature and pressure, and then obtaining the difference.

[0068] In one optional implementation, the actual value of the compressor suction superheat is obtained by acquiring the temperature and corresponding pressure on the suction side of the compressor. Specifically, this involves determining the type and state of the refrigerant, measuring the temperature and pressure on the suction side of the compressor, and based on the measured pressure, consulting a refrigerant saturation temperature table or using a refrigerant property chart to determine the saturation temperature of the refrigerant at that pressure. The superheat is then calculated as: Suction superheat = Actual temperature - Saturation temperature, where the actual temperature is the temperature of the refrigerant at the compressor suction port, and the saturation temperature is the refrigerant saturation temperature corresponding to the suction side pressure. The acquisition method includes, but is not limited to, this.

[0069] S130. Select the adjustment method of the opening of the electronic expansion valve according to the target value of the compressor superheat and the actual value of the compressor superheat;

[0070] In this embodiment, the electronic expansion valve opening adjustment method requires setting the pre-opening degree of the electronic expansion valve in advance. The adjustment of the electronic expansion valve needs to be carried out based on the pre-opening degree. The corresponding opening adjustment method is selected according to the target value of the compressor superheat and the actual value of the compression superheat. It can be based on the deviation trend between the target value of superheat and the actual value of superheat, or it can be based on the difference between the target value of superheat and the actual value of superheat.

[0071] In one optional implementation, the method for adjusting the opening of the electronic expansion valve based on the deviation trend between the target superheat value and the actual superheat value is specifically implemented as follows: A target deviation trend value for superheat is preset. This target deviation trend value includes a positive deviation trend value and a negative deviation trend value. The positive deviation trend value represents the difference between the actual intake superheat and the target value, and the negative deviation trend value represents the difference between the actual intake superheat and the target value. The positive and negative deviation trend values ​​can represent the fluctuation range of the difference. Based on the preset positive and negative deviation trend values, a target value deviation trend judgment is performed on the difference between the obtained target superheat value and the actual superheat value to obtain a judgment result. The judgment result includes a first judgment result, a second judgment result, and a third judgment result. The adjustment cycle corresponding to the first judgment result is the first cycle, and the adjustment cycle corresponding to the second judgment result is the third cycle. The adjustment cycle is the second cycle, and the cycle corresponding to the third judgment result is the third cycle. Specifically: the first judgment result is that when the real-time difference is less than or equal to the negative deviation trend value, or greater than or equal to the positive deviation trend value, the PID adjustment mode is selected, and the corresponding adjustment cycle is T1; the second judgment result is that when the real-time difference is less than or equal to the negative deviation trend value and increases compared to the previous difference, the PID adjustment mode is selected, and the corresponding adjustment cycle is T2; the third judgment result is that when the real-time difference is greater than or equal to the positive deviation trend value and decreases compared to the previous difference, the PID adjustment is selected, and the corresponding adjustment cycle is T2. The first cycle, the second cycle, and the third cycle can be the same or different, and the specific settings depend on the system parameters that need to be adjusted. The adjustment mode includes but is not limited to this.

[0072] In a more preferred implementation, the difference between the target value and the actual value of the compressor superheat is used to determine whether the difference falls within a preset difference range. This preset difference range corresponds to an electronic expansion valve adjustment method. The corresponding electronic expansion valve adjustment method is selected based on the difference. The adjustment method corresponding to the preset difference range includes an adjustment form, an adjustment cycle, and an adjustment step frequency. The adjustment form is a combination of step adjustment and / or PID adjustment. Specifically, based on the difference between the target value and the actual value of the compressor superheat (denoted as ΔT), a superheat difference range variable is set as y, and a corresponding difference range is defined. The unit adjustment step frequency for step adjustment is zP / s, and the step frequency for PID adjustment is (1~...). max The maximum value (max) is device-defined, while the maximum value (x) can be set by different device models.

[0073] xx is an integer greater than 1; the adjustment period is t, which can be set independently according to the parameter performance of the refrigeration system. The difference of ΔT is divided into positive deviation and negative deviation. The specific range of positive deviation and negative deviation can be set according to the actual parameter performance of the refrigeration system. When ΔT is in the negative deviation, the opening adjustment of the electronic expansion valve is to reduce the valve opening, which can be understood as closing the valve. That is, when ΔT is in the range of [-y, y], the electronic expansion valve does not adjust and maintains the pre-opening degree; when ΔT is in the range of [-y-1, -y), the electronic expansion valve closes the valve at a step frequency of z P / s, and the adjustment period is t3. When ΔT is within the range of [-y-2, -y-1), the electronic expansion valve closes at a step frequency of (z+2) P / s, with an adjustment period of t4; when ΔT is within the range of [-y-3, -y-2), the electronic expansion valve closes at a step frequency of (z+6) P / s, with an adjustment period of t5; when ΔT is less than -y-3, the electronic expansion valve adjusts at a step frequency of (z+10) P / s, with an adjustment period of t9 seconds; when ΔT is greater than the preset specific difference range, it will switch to PID control mode for PID adjustment. When switching to PID control, if ΔT is less than -y-3, the electronic expansion valve will perform PID adjustment with a period of T1 or T2. When ΔT is in a positive deviation, the adjustment of the electronic expansion valve opening manifests as increasing the valve opening, which can be understood as opening the valve. Specifically, when ΔT is in the range [-y, y], the electronic expansion valve does not adjust; when ΔT is in the range [y, y+2), the electronic expansion valve opens at a step frequency of z P / s, with an adjustment period of t6. When ΔT is in the range [y+2, y+4), the electronic expansion valve opens at a step frequency of (z+2) P / s, with an adjustment period of t7; when ΔT is in the range [y+4, y+6), the electronic expansion valve opens at a step frequency of (z+6) P / s, with an adjustment period of t8; when ΔT is greater than y+6, the electronic expansion valve limits the opening at a step frequency of (z+10) P / s, with an adjustment period of t. 10 Seconds; when ΔT is greater than the preset specific difference range, it will switch to PID control mode for PID adjustment. When switching to PID control, when ΔT is greater than y+6, the electronic expansion valve will perform PID adjustment with a period of T1 or T2. The adjustment mode includes, but is not limited to, this.

[0074] S140. Adjust the opening of the electronic expansion valve according to the adjustment method of the electronic expansion valve opening.

[0075] In this embodiment, the opening of the electronic expansion valve is adjusted by combining PID control and step control. The difference between the target value and the actual value of superheat is obtained, and the target value trend is judged based on the difference. The corresponding PID control method is selected based on the result of the target value trend judgment. If the difference does not meet the condition of the target value trend judgment, another control method is used. A preset difference range is set, and it is judged whether the difference belongs to the preset difference range. If the difference belongs to the preset range, a control method combining step control and PID control is used. The control method has a corresponding control form, control step frequency, and control period.

[0076] In one optional implementation, the difference between the target value of superheat and the actual value of superheat is obtained, and the target value trend is judged using the difference. Based on the result of the target value trend judgment, the corresponding adjustment method of the electronic expansion valve opening is selected. A preset difference range is established, and the difference range corresponds to an adjustment method of the electronic expansion valve opening. It is determined whether the obtained difference belongs to the preset difference range. If it does, the corresponding adjustment method is selected for adjustment. The adjustment method includes, but is not limited to, this range.

[0077] In a more preferred implementation, when the control system adjusts the opening of the electronic expansion valve, a limit time setting is added. Within the preset limit time, the adjustment mode can be freely switched. It can be PID adjustment, pure step adjustment, or a combination of PID adjustment and step adjustment, which is more flexible and has higher efficiency in adjusting the opening of the electronic expansion valve. The implementation method is not specifically limited.

[0078] The technical solution of an electronic expansion valve opening adjustment method provided in this application will be described below with reference to a specific embodiment.

[0079] like Figure 2 As shown in the figure, this application embodiment also provides an electronic expansion valve opening adjustment device 210.

[0080] Optionally, the electronic expansion valve opening adjustment device 210 may include:

[0081] The preset module 211 is used to preset the target value of the compressor superheat and the adjustment mode of the electronic expansion valve opening.

[0082] In this embodiment, the preset module 211 can be used to perform... Figure 1 For a detailed description of the preset module 211, please refer to the description of step S110 shown.

[0083] The acquisition module 212 is used to acquire the actual value of the superheat of the compressor;

[0084] In this embodiment, the acquisition module 212 can be used to perform... Figure 1 For a detailed description of the acquisition module 212, please refer to the description of step S120 shown.

[0085] Selection module 213 is used to select the adjustment method of the opening of the electronic expansion valve according to the target value of the superheat and the actual value of the superheat;

[0086] In this embodiment, the selection module 213 can be used to perform... Figure 1 For a detailed description of the selection module 213 shown in step S130, please refer to the description of step S130.

[0087] The adjustment module 214 is used to adjust the opening of the electronic expansion valve according to the adjustment method of the electronic expansion valve opening.

[0088] In this embodiment, the adjustment module 214 can be used to perform... Figure 1 For a detailed description of the adjustment module 214 shown in step S140, please refer to the description of step S140.

[0089] It is understood that the above-described device embodiments and method embodiments can correspond to each other, and similar descriptions of the device embodiments can be referred to the method embodiments. To avoid repetition, further details are omitted here. The electronic expansion valve opening adjustment device provided in this application can execute the electronic expansion valve opening adjustment method provided in any embodiment of this application, possessing the corresponding functional modules and beneficial effects of the method. The functional modules of the electronic expansion valve opening adjustment device can be implemented in hardware, in software instructions, or in a combination of hardware and software modules.

[0090] Specifically, each step of the method embodiment of this application can be completed by the integrated logic circuit of the hardware in the processor and / or by instructions in the form of software. The steps of the electronic expansion valve opening adjustment method in conjunction with the embodiment of this application can be directly reflected as being executed by the hardware encoding processor, or being executed by a combination of hardware and software modules in the encoding processor.

[0091] Optionally, the software module can be located in random access memory, such as read-only memory, programmable read-only memory, flash memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps in the above method embodiments.

[0092] This application provides an electronic device 310, the structure of which is as follows: Figure 3 As shown.

[0093] like Figure 3 As shown, the electronic device 310 includes a memory 311, a processor 312, a communication module 313, and an input / output interface 314, etc. Optionally, the memory 311, the processor 312, the communication module 313, and the input / output interface 314 can be connected and communicate with each other through a bus 315.

[0094] The memory 311 is used to store one or more computer programs and to transfer the code of the computer programs to the processor 312; when the one or more computer programs are executed by the processor 312, an electronic expansion valve opening adjustment method is implemented in the embodiments of this application.

[0095] Optionally, the electronic device 310 can be connected to a network via a communication module 313 to communicate with other devices, such as terminals or servers, and to interact with data. The electronic device 310 can be various forms of digital computers, such as desktop computers, servers, workbenches, mainframes, or other types of computers. The electronic device 310 can also be various forms of mobile terminals, such as smartphones, tablets, wearable devices (e.g., helmets, glasses, watches), and other similar mobile terminals.

[0096] Optionally, the electronic device 310 can connect to required input / output devices, such as a keyboard or display device, through the input / output interface 314. The electronic device 310 itself may have a display device, and other display devices can also be connected externally through the input / output interface 314. Optionally, a storage device, such as a hard disk, can also be connected through the input / output interface 314 to store data in the electronic device 310, or to read data from the storage device, or to store data in the storage device into the memory 311. It is understood that the input / output interface 314 can be a wired interface or a wireless interface. Depending on the actual application scenario, the device connected to the input / output interface 314 can be a component of the electronic device 310, or an external device connected to the electronic device 310 when needed.

[0097] Optionally, the memory 311 may be a volatile memory and / or a non-volatile memory. The volatile memory may be a random access memory, etc., and the non-volatile memory may be a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, or a flash memory, etc.

[0098] Optionally, the computer program stored in the processor 312 can be divided into one or more modules, which are stored in the memory 311 and executed by the processor 312 to perform the method provided in the embodiment. The one or more modules can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the electronic device 310.

[0099] Optionally, the processor 312 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 312 include, but are not limited to, a central processing unit, a graphics processing unit, a digital signal processor, various special-purpose artificial intelligence computing chips, various processors running machine learning model algorithms, and can also be any suitable controller, microcontroller, processor, etc. The processor 312 executes the various methods and processes of this embodiment, exemplarily, such as an electronic expansion valve opening adjustment method according to an embodiment of this application.

[0100] Optionally, the bus 315 may include a path for transmitting information. The bus 315 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Depending on its function, the bus 315 may be divided into an address bus, a data bus, a control bus, etc.

[0101] In an optional implementation, this application embodiment also provides a computer storage medium storing a computer program thereon, which, when executed by a computer, enables the computer to perform the methods described in the above-described method embodiments. Part or all of the computer program may be loaded into and / or installed on the memory 311 of the electronic device 310. When the computer program is executed by the processor 312, one or more steps of an electronic expansion valve opening adjustment method according to an embodiment of this application can be performed.

[0102] Optionally, the computer-readable storage medium may be a random access memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, etc.

[0103] Obviously, the above embodiments of this application are merely examples for clearly illustrating the technical solution of this application, and are not intended to limit the specific implementation of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this application should be included within the protection scope of the claims of this application.

Claims

1. A method for adjusting the opening degree of an electronic expansion valve, wherein the electronic expansion valve is used in an air conditioning unit, the air conditioning unit comprising a compressor, an evaporator, and a condenser that form a refrigerant cycle with the electronic expansion valve, characterized in that, The method includes: The target value of the compressor superheat and the adjustment method of the electronic expansion valve opening are preset; Obtain the actual value of the compressor superheat; The adjustment method for the opening of the electronic expansion valve is selected based on the target value of the compressor superheat and the actual value of the compressor superheat; The opening of the electronic expansion valve is adjusted according to the adjustment method of the electronic expansion valve opening; The step of selecting the adjustment method for the opening of the electronic expansion valve based on the target value and the actual value of the compressor superheat includes: obtaining the difference between the target value and the actual value of the compressor superheat; determining the deviation trend of the target value based on the difference to obtain a judgment result; and selecting the adjustment method for the opening of the electronic expansion valve based on the judgment result. The step of determining the target value deviation trend based on the difference to obtain a judgment result includes: a preset target deviation trend value for superheat, the target deviation trend value including a positive deviation trend value and a negative deviation trend value, the positive deviation trend value representing the difference between the actual intake superheat and the target value, and the negative deviation trend value representing the difference between the actual intake superheat and the target value, and determining the target value deviation trend based on the positive deviation trend value and the negative deviation trend value to obtain a judgment result; The step of selecting the adjustment method for the opening of the electronic expansion valve based on the judgment result includes: the judgment result includes a first judgment result, a second judgment result, and a third judgment result, specifically: The first judgment result is that the difference is less than or equal to the negative deviation trend value, or greater than or equal to the positive deviation trend value; Based on the first judgment result, a PID adjustment mode is selected, and the adjustment period corresponding to the PID adjustment mode is the first period; The second judgment result is that the difference is less than or equal to the negative deviation trend value, and increases compared to the difference obtained previously; Based on the second judgment result, a PID adjustment mode is selected, and the adjustment period corresponding to the PID adjustment mode is the second period; The third judgment result is that the difference is greater than or equal to the positive deviation trend value, and decreases compared to the difference obtained previously; The PID control method is selected based on the third judgment result, and the control period corresponding to the PID control method is the third cycle.

2. The method for adjusting the opening degree of an electronic expansion valve according to claim 1, characterized in that, The preset adjustment methods for the opening of the electronic expansion valve include PID control and step control.

3. The method for adjusting the opening degree of an electronic expansion valve according to claim 2, characterized in that, The method further includes: Preset variable values; The difference range is set according to the variable value, and each difference range corresponds to an electronic expansion valve opening adjustment method; Obtain the difference between the target value of the compressor superheat and the actual value of the compressor superheat; If the difference is within the difference range, then select the corresponding type of electronic expansion valve opening adjustment method.

4. The method for adjusting the opening degree of an electronic expansion valve according to claim 3, characterized in that, Each electronic expansion valve opening adjustment method includes the adjustment cycle and adjustment step frequency of PID adjustment and step adjustment.

5. The method for adjusting the opening degree of an electronic expansion valve according to claim 1, characterized in that, The target value of the preset superheat includes: Multiple preset temperature ranges; Each of the temperature ranges corresponds to a target value for superheat.

6. An electronic expansion valve opening adjustment device, the electronic expansion valve being used in an air conditioning unit, the air conditioning unit comprising a compressor, an evaporator, and a condenser forming a refrigerant cycle with the electronic expansion valve, characterized in that, include: The preset module is used to preset the target value of the compressor superheat and the adjustment mode of the electronic expansion valve opening. The acquisition module is used to acquire the actual value of the compressor superheat. The selection module is used to select the adjustment method of the electronic expansion valve opening based on the target value of the compressor superheat and the actual value of the compressor superheat; The adjustment module is used to adjust the opening of the electronic expansion valve according to the adjustment method of the electronic expansion valve opening; The step of selecting the adjustment method for the opening of the electronic expansion valve based on the target value and the actual value of the compressor superheat includes: obtaining the difference between the target value and the actual value of the compressor superheat; determining the deviation trend of the target value based on the difference to obtain a judgment result; and selecting the adjustment method for the opening of the electronic expansion valve based on the judgment result. The step of determining the target value deviation trend based on the difference to obtain a judgment result includes: a preset target deviation trend value for superheat, the target deviation trend value including a positive deviation trend value and a negative deviation trend value, the positive deviation trend value representing the difference between the actual intake superheat and the target value, and the negative deviation trend value representing the difference between the actual intake superheat and the target value, and determining the target value deviation trend based on the positive deviation trend value and the negative deviation trend value to obtain a judgment result; The step of selecting the adjustment method for the opening of the electronic expansion valve based on the judgment result includes: the judgment result includes a first judgment result, a second judgment result, and a third judgment result, specifically: The first judgment result is that the difference is less than or equal to the negative deviation trend value, or greater than or equal to the positive deviation trend value; Based on the first judgment result, a PID adjustment mode is selected, and the adjustment period corresponding to the PID adjustment mode is the first period; The second judgment result is that the difference is less than or equal to the negative deviation trend value, and increases compared to the difference obtained previously; Based on the second judgment result, a PID adjustment mode is selected, and the adjustment period corresponding to the PID adjustment mode is the second period; The third judgment result is that the difference is greater than or equal to the positive deviation trend value, and decreases compared to the difference obtained previously; The PID control method is selected based on the third judgment result, and the control period corresponding to the PID control method is the third cycle.

7. An electronic device, characterized in that, include: Memory, used to store one or more computer programs; A processor, when the one or more computer programs are executed by the processor, implements an electronic expansion valve opening adjustment method as described in any one of claims 1-5.

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