Method and device for adjusting opening degree of electronic expansion valve and electronic equipment

Abstract

The invention relates to the field of electronic expansion valve adjustment of aircraft ground air conditioners, in particular to an electronic expansion valve opening adjusting method and device and electronic equipment, and the method comprises the steps that a target value of the superheat degree of a compressor and an adjusting mode of the electronic expansion valve opening are preset; the actual value of the superheat degree of the compressor is obtained; according to the target value of the superheat degree of the compressor and the actual value of the superheat degree of the compressor, the adjusting mode of the opening degree of the electronic expansion valve is selected; and the opening degree of the electronic expansion valve is adjusted according to the adjusting mode of the opening degree of the electronic expansion valve. According to the embodiment of the invention, the electronic expansion valve of the aircraft ground air conditioner is adjusted, stepping adjustment and PID adjustment are combined, a more suitable adjustment mode is selected under different working requirements, the adjustment cost is reduced, more accurate adjustment can be realized, and the adjustment efficiency is improved. The problem that the air outlet temperature is unstable due to unstable opening adjustment of the electronic expansion valve is solved, and the working efficiency of the aircraft ground air conditioner is improved.

Description

Technical Field

[0001] The present invention relates to the field of electronic expansion valve regulation of aircraft ground air conditioning, and more specifically, to an electronic expansion valve opening regulation method and device, and electronic equipment. Background Art

[0002] At present, the throttling device of domestic aircraft ground air conditioning basically adopts electronic expansion valve, which adopts target evaporation superheat PID adjustment and adopts a set of PID parameters to deal with the adjustment of all scenarios. It is suitable for fixed frequency system and variable frequency system. For fixed frequency system, the adjustment effect is good, but for variable frequency system, compressor variable frequency adjustment and EEV dynamic PID adjustment make the compressor frequency and EEV opening output unstable, and the superheat will be negative from time to time, sometimes causing liquid return, which will lead to large fluctuations in the unit outlet temperature and even cause unit failure. A more sophisticated control strategy is needed to control the opening of the electronic expansion valve to ensure the stability and efficiency of the system. Summary of the invention

[0003] The present invention aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provide an electronic expansion valve opening adjustment method and device, and electronic equipment for solving the problem of unstable opening adjustment of the electronic expansion valve.

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

[0005] Presetting a target value of the compressor superheat and a regulating method of the electronic expansion valve opening;

[0006] Obtaining an actual value of the compressor superheat;

[0007] Selecting a mode for adjusting the opening of the electronic expansion valve according to a target value of the compressor superheat and an actual value of the compressor superheat;

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

[0009] The electronic expansion valve adjustment method can achieve better control of the refrigerant flow in the refrigeration system, improve the response speed, improve environmental adaptability, and timely diagnose and maintain the operating performance of the refrigeration system, thereby optimizing the entire system.

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

[0011] The PID adjustment method is realized by the PID control algorithm, and the proportional, integral and differential coefficients are adjusted to optimize the control effect of the system. It can be applied to many different control systems, including motor control, temperature control, robot control, etc. The common ones that rely on the PID control algorithm are PID controllers. The PID controller can automatically adjust the control parameters, such as proportional coefficient, integral time, differential time, etc., according to the actual feedback signal and the set value, so as to achieve better control effect. The PID adjustment method is applied to the opening adjustment of the electronic expansion valve, which can achieve high-precision control; the step adjustment method uses a stepper motor for adjustment. The angular displacement of the stepper motor is strictly proportional to the number of input pulses, and no error is accumulated. The accuracy of the general stepper motor is 3-5% of the step angle. The stepper motor can realize open-loop position control. A pulse signal is input to obtain a specified position increment. Compared with the traditional DC control system, the cost is significantly reduced, and there is almost no need to adjust the system. It plays an important role in the opening adjustment of the electronic expansion valve.

[0012] Optionally, the adjusting method of selecting the opening degree according to the target value of the compressor superheat degree and the actual value of the compressor superheat degree includes:

[0013] Obtaining a difference between a target value of the compressor superheat and an actual value of the compressor superheat;

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

[0015] A method for adjusting the opening of the electronic expansion valve is selected according to the judgment result.

[0016] The difference between the target value of the compressor superheat and the actual value of the compressor superheat plays an important role in the refrigeration system. The target difference of the suction superheat ensures that the refrigerant entering the compressor is in a vapor state rather than a liquid state, thereby avoiding wet compression and protecting the compressor from liquid hammer damage. By measuring the actual difference of the suction superheat, that is, the temperature difference between the temperature of the compressor return pipe or the evaporator outlet and the corresponding saturation temperature, the expansion valve can automatically adjust the valve opening, indirectly control the liquid supply to the evaporator, and effectively manage the suction superheat. The difference between the target value and the actual value of the suction superheat is crucial to ensure the safe and efficient operation of the refrigeration system. They directly affect the refrigeration performance of the system and the service life of the compressor by controlling the suction conditions of the compressor and the opening of the expansion valve.

[0017] Optionally, the step of performing target value deviation trend judgment according to the difference to obtain a judgment result includes:

[0018] Presetting a target deviation trend value of superheat, 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 judged on the difference according to the positive deviation trend value and the negative deviation trend value to obtain a judgment result.

[0020] The target value deviation trend judgment can perform closed-loop control on the refrigeration system by comparing the target value deviation and the actual value deviation to obtain better correction and stable control effects. The target value deviation trend judgment can be used to regularly detect the actual value of the output and compare it with the target value to obtain the deviation. The deviation value is used to generate a control and adjustment effect to eliminate the deviation so that the output maintains the target value. Through a digitized approach, possible problems in the system can be more accurately identified and predicted. The positive deviation indicates the absolute value of the deviation that exceeds the target value, while the negative deviation indicates the absolute value of the deviation that does not reach the target value. The target value deviation trend judgment plays an important role in ensuring system stability, optimizing control parameters, improving control accuracy, and performing fault diagnosis and performance optimization in the refrigeration system.

[0021] Optionally, the selecting, according to the judgment result, a mode for adjusting the opening of the electronic expansion valve 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 is greater than or equal to the positive deviation trend value;

[0024] Selecting a PID adjustment method according to the first judgment result, wherein the adjustment period corresponding to the PID adjustment method 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 is greater than the difference obtained last time;

[0026] Selecting a PID adjustment mode according to the second judgment result, wherein 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 is smaller than the difference obtained last time;

[0028] A PID adjustment mode is selected according to the third judgment result, and an adjustment period corresponding to the PID adjustment mode is the third period.

[0029] The different judgment results correspond to electronic expansion valve adjustment modes with different cycles, which helps the electronic expansion valve to be adjusted under different circumstances, achieves accurate adjustment, and improves the working efficiency of the refrigeration system.

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

[0031] Preset variable values;

[0032] Setting a difference interval according to the variable value, and setting each difference interval to correspond to an electronic expansion valve opening adjustment mode;

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

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

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

[0036] Each of the electronic expansion valve opening adjustment methods automatically adjusts the opening according to different actual operating conditions by setting a specific adjustment method. The specific adjustment method includes an adjustment cycle and an adjustment step frequency. By setting an appropriate adjustment method, the adjustment function of the electronic expansion valve can be brought into play, and precise control of the refrigerant can be achieved to meet the needs of variable frequency and non-variable frequency systems.

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

[0038] Preset multiple temperature ranges;

[0039] A target value of superheat is set corresponding to each temperature interval.

[0040] In the process of adjusting the opening of the electronic expansion valve, multiple temperature intervals are set and a target value of superheat is set in each temperature interval, so that the refrigerant flow rate can be controlled more accurately, ensuring that the superheat is maintained within the target range to meet the different working conditions of the electronic expansion valve, which helps to speed up the refrigeration speed, accurately control the temperature, and achieve energy saving. The electronic expansion valve can quickly respond to changes in the system load by adjusting the temperature interval according to the actual load demand, thereby achieving more accurate temperature control. Setting the temperature interval plays a key role in the process of adjusting the opening of the electronic expansion valve. It not only improves the control accuracy and response speed of the system, but also helps to achieve energy saving and expand control functions.

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

[0042] A preset module, used for presetting a target value of the compressor superheat and a regulating method of the electronic expansion valve opening;

[0043] An acquisition module, used for acquiring an actual value of the superheat of the compressor;

[0044] A selection module, used for selecting a mode for adjusting the opening of the electronic expansion valve according to the target value of the superheat and the actual value of the superheat;

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

[0046] The device can realize precise opening adjustment of the electronic expansion valve. The target value of the compressor superheat and the adjustment method of the electronic expansion valve opening are preset through a preset module, and then the actual value of the compressor superheat is obtained by an acquisition module, so that the selection module can select the adjustment method of the electronic expansion valve opening according to 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 opening of the electronic expansion valve is adjusted through the adjustment module.

[0047] According to a third aspect of the present application, an electronic device is provided, including:

[0048] a memory for storing one or more computer programs;

[0049] The processor implements the method for adjusting the opening degree of an electronic expansion valve as described in the first aspect above when the one or more computer programs are executed by the processor.

[0050] According to a fourth aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement an electronic expansion valve opening adjustment method described in the first aspect when executed.

[0051] Based on any of the above aspects, an electronic expansion valve opening adjustment method, device, electronic device and computer storage medium provided in the embodiment of the present application can realize accurate 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 length of each adjustment can be reduced to avoid excessive one-time adjustment of the EEV opening, thereby reducing the risk of system over-adjustment and improving the stability and response speed of the system. At the same time, by increasing the 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 time of adjusting the valve, helping the system to respond to temperature changes more smoothly, reducing the system oscillation caused by rapid adjustment, and facilitating the selection of a suitable electronic expansion valve opening adjustment method. It also includes a preset temperature range, and selecting the corresponding electronic expansion valve opening adjustment method, which can reduce the impact on the compressor output and make the system approach steady-state operation faster. The preset electronic expansion valve opening adjustment method can be adjusted according to the actual system response and control requirements, improve the adjustment accuracy and response speed of the electronic expansion valve, reduce system over-adjustment, improve energy efficiency, and enhance the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 This is a flow chart of a method for adjusting the opening of an electronic expansion valve provided in this embodiment.

[0054] Figure 2 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 an electronic device provided in this embodiment. DETAILED DESCRIPTION

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

[0057] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0059] The throttling devices currently used are thermal expansion valves and electronic expansion valves. Since the thermal expansion valve mainly relies on the temperature-sensing package to sense the superheat at the evaporator outlet to adjust the opening, this adjustment method is relatively simple, the adjustment accuracy is not as good as the electronic expansion valve, the response speed to system load changes is slow, and the application scenario is relatively single. The output control of the electronic expansion valve is unstable. When the parameters of the PID controller (proportional coefficient K p , integration time constant T i , differential time constant T d ) Improper settings may cause the control system to oscillate and affect the stability of the system. 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 require appropriate control methods to achieve, otherwise it may lead to poor control effects. 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 the PID adjustment, resulting in large fluctuations in the unit's outlet air temperature and even causing air-conditioning unit failures.

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

[0061] S110, presetting a target value of the compressor superheat and a method for adjusting the opening of the electronic expansion valve;

[0062] In this embodiment, the preset compressor superheat can be the suction superheat or the exhaust superheat. The target value of the compressor superheat needs to be set according to the performance parameters of each device in the refrigeration system and the actual working requirements and working environment. The target value of the superheat is achieved by making the opening of the electronic expansion valve meet the demand of the evaporator liquid supply, so that the liquid supply can match the evaporation load to achieve overall temperature control; the adjustment method of the preset electronic expansion valve opening includes PID adjustment and / or step adjustment, which can be step adjustment, PID adjustment, or a combination of step adjustment and PID adjustment to form a specific adjustment scheme, and the adjustment method is not specifically limited. The preset electronic expansion valve opening adjustment method also includes the preset temperature range corresponding to the adjustment method, the adjustment form, the adjustment cycle, and the adjustment step frequency. The adjustment form can be step adjustment, PID adjustment, or a combination of step adjustment and PID adjustment. The adjustment cycle is the step frequency time interval for adjusting the electronic expansion valve opening. The adjustment step frequency can be set as a unit adjustment step frequency. The adjustment method of the preset electronic expansion valve opening is not specifically limited.

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

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

[0065] In a more preferred implementation, the temperature range, adjustment form, adjustment cycle, and adjustment step frequency corresponding to the electronic expansion valve opening adjustment mode are preset. The adjustment form is a combination of step adjustment and PID adjustment. Specifically, according to the difference between the target value of the compressor superheat and the actual value of the compressor superheat, the difference is recorded as △T, the superheat difference range variable is set to y, and the corresponding difference range is set. The unit adjustment step frequency of the step adjustment is z P / s, and the step frequency of the PID adjustment is The max value is limited by the device, the x value can be set by different models, and x is an integer greater than 1; the adjustment period is t, and the adjustment period can be independently set according to the parameter performance of the refrigeration system. The difference of △T includes positive deviation and negative deviation. The specific values ​​of the positive deviation and negative deviation can be set according to the actual parameter performance of the refrigeration system. When △T is in a negative deviation, the opening adjustment of the electronic expansion valve is manifested as reducing the valve opening, which can be understood as closing the valve, that is, when △T is in the range of [-y, y], the electronic expansion valve is not adjusted and the pre-opening is maintained; when △T is in the range of [-y-1, -y), the electronic expansion valve is closed at a step frequency of z P / s, and the adjustment period is t3. When △T is in the range of [-y-2, -y-1), the electronic expansion valve closes at a step frequency of (z+2)P / s, and the adjustment period is t4; when △T is in the range of [-y-3, -y-2), the electronic expansion valve closes at a step frequency of (z+6)P / s, and the adjustment period is t5; when △T is less than -y-3, the electronic expansion valve is adjusted at a step frequency of (z+10)P / s, and the adjustment period is t9 seconds; when △T is greater than the preset specific difference range, it will switch to PID adjustment mode for PID adjustment. When switching to PID adjustment, when △T is less than -y-3, the electronic expansion valve will perform PID adjustment with a period of T1 or T2. When △T is in a positive deviation, the opening adjustment of the electronic expansion valve is manifested as expanding the valve opening, which can be understood as opening the valve, that is, when △T is in the range of [-y, y], the electronic expansion valve is not adjusted; when △T is in the range of [y, y+2), the electronic expansion valve opens at a step frequency of zP / s, and the adjustment period is t6. When △T is in the range of [y+2, y+4), the electronic expansion valve opens at a step frequency of (z+2)P / s, and the adjustment period is t7; when △T is in the range of [y+4, y+6), the electronic expansion valve opens at a step frequency of (z+6)P / s, and the adjustment period is t8; when △T is greater than y+6, the electronic expansion valve limits the opening at a step frequency of (z+10)P / s, and the adjustment period is t 10 seconds; when △T is greater than the preset specific difference range, it will switch to PID adjustment mode for PID adjustment. When switching to PID adjustment, when △T is greater than y+6, the electronic expansion valve will perform PID adjustment with a period of T1 or T2. The adjustment method includes but is not limited to this.

[0066] S120, obtaining an actual value of the superheat of the compressor;

[0067] In this embodiment, the actual value of the compressor superheat is obtained. The actual value of the compressor superheat may be the suction superheat or the exhaust superheat. The method of obtaining the value may be direct measurement or the suction superheat calculated according to the actual suction temperature and the actual suction pressure to obtain the difference.

[0068] In an optional implementation, the actual value of the compressor suction superheat is obtained by obtaining the temperature on the suction side of the compressor, and the corresponding pressure. Specifically, the type and state of the refrigerant are determined, the temperature and pressure on the suction side of the compressor are measured, and according to the measured pressure, the saturation temperature table of the refrigerant is searched or a property chart of the refrigerant is used to determine the saturation temperature of the refrigerant under the pressure, and the superheat is calculated: suction superheat = actual temperature - saturation temperature, wherein the actual temperature is the temperature of the refrigerant at the suction port of the compressor, 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, selecting a mode for adjusting 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 needs to set the pre-opening of the electronic expansion valve in advance, and the electronic expansion valve needs to be adjusted based on the pre-opening. 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 of the superheat target value and the actual superheat value, and can also be achieved based on the difference between the superheat target value and the actual superheat value.

[0071] In an optional implementation, a method for adjusting the opening of an electronic expansion valve is selected based on a deviation trend between a superheat target value and an actual superheat value, and is specifically implemented as follows: a target deviation trend value of superheat is preset, the target deviation trend value includes a positive deviation trend value and a negative deviation trend value, the positive deviation trend value indicates a difference between an actual suction superheat and a target value, the negative deviation trend value indicates a difference between an actual suction superheat and a target value, the positive deviation trend value and the negative deviation trend value can indicate a floating range of the difference, a target value deviation trend judgment is performed on the difference between an acquired superheat target value and an actual superheat value according to the preset positive deviation trend value and the negative deviation trend value to obtain a judgment result, the judgment result includes a first judgment result, a second judgment result, and a third judgment result, the first judgment result corresponds to a first cycle, and the second judgment result corresponds to a third cycle. The adjustment period is the second period, and the period corresponding to the third judgment result is the third period, specifically: the first judgment result is that when the real-time difference is less than or equal to the negative deviation trend value, or is greater than or equal to the positive deviation trend value, the PID adjustment method is selected, and the corresponding adjustment period 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 the difference compared with the previous acquisition increases, the PID adjustment method is selected, and the corresponding adjustment period 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 the difference compared with the previous acquisition decreases, PID adjustment is selected, and the corresponding adjustment period is T2. The first period, the second period, and the third period may be the same or different, and the specific setting depends on the system parameters that need to be adjusted. The adjustment method includes but is not limited to this.

[0072] In a more preferred implementation, according to the difference between the target value of the compressor superheat and the actual value of the compressor superheat, it is judged whether the difference belongs to a preset difference range, the preset difference range corresponds to an electronic expansion valve adjustment mode, the corresponding electronic expansion valve adjustment mode is selected according to the difference, the adjustment mode corresponding to the preset difference range includes an adjustment form, an adjustment cycle, and an adjustment step frequency, and the adjustment form is a combination of step adjustment and / or PID adjustment. Specifically, according to the difference between the target value of the compressor superheat and the actual value of the compressor superheat, the difference is recorded as △T, the superheat difference range variable is set to y, and the corresponding difference range is set, the unit adjustment step frequency of the step adjustment is z P / s, and the step frequency of the PID adjustment is (1~ max )P / s, the max value is limited by the device, and the x value can be set by different models.

[0073] xx is an integer greater than 1; the adjustment period is t, and the adjustment period can be independently set according to the parameter performance of the refrigeration system. The difference of △T is divided into positive deviation and negative deviation. The specific range values ​​of the positive deviation and negative deviation can be set according to the actual parameter performance of the refrigeration system. When △T is in a negative deviation, the opening adjustment of the electronic expansion valve is manifested as reducing the valve opening, which can be understood as closing the valve, that is, when △T is in the range of [-y, y], the electronic expansion valve is not adjusted and the pre-opening is maintained; when △T is in the range of [-y-1, -y), the electronic expansion valve is closed at a step frequency of z P / s, and the adjustment period is t3. When △T is in the range of [-y-2, -y-1), the electronic expansion valve closes at a step frequency of (z+2)P / s, and the adjustment period is t4; when △T is in the range of [-y-3, -y-2), the electronic expansion valve closes at a step frequency of (z+6)P / s, and the adjustment period is t5; when △T is less than -y-3, the electronic expansion valve is adjusted at a step frequency of (z+10)P / s, and the adjustment period is t9 seconds; when △T is greater than the preset specific difference range, it will switch to PID adjustment mode for PID adjustment. When switching to PID adjustment, when △T is less than -y-3, the electronic expansion valve will perform PID adjustment with a period of T1 or T2. When △T is in a positive deviation, the opening adjustment of the electronic expansion valve is manifested as expanding the valve opening, which can be understood as opening the valve, that is, when △T is in the range of [-y, y], the electronic expansion valve is not adjusted; when △T is in the range of [y, y+2), the electronic expansion valve opens at a step frequency of z P / s, and the adjustment period is t6. When △T is in the range of [y+2, y+4), the electronic expansion valve opens at a step frequency of (z+2)P / s, and the adjustment period is t7; when △T is in the range of [y+4, y+6), the electronic expansion valve opens at a step frequency of (z+6)P / s, and the adjustment period is t8; when △T is greater than y+6, the electronic expansion valve limits the opening at a step frequency of (z+10)P / s, and the adjustment period is t 10 seconds; when △T is greater than the preset specific difference range, it will switch to PID adjustment mode for PID adjustment. When switching to PID adjustment, when △T is greater than y+6, the electronic expansion valve will perform PID adjustment with a period of T1 or T2. The adjustment method includes but is not limited to this.

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

[0075] In this embodiment, the electronic expansion valve opening is adjusted by combining PID regulation and step regulation, the difference between the target value of superheat and the actual value of superheat is obtained, the target value trend is judged for the difference, and the corresponding PID regulation mode is selected according to the result of the target value trend judgment. If the difference does not meet the target value trend judgment condition, another regulation mode is performed, a difference interval is preset, and it is judged whether the difference belongs to the preset difference interval. If the difference belongs to the preset interval, a regulation mode combining step regulation and PID regulation is performed, and the regulation mode has corresponding regulation form, regulation step frequency and regulation cycle.

[0076] In an optional implementation, the difference between the target value of superheat and the actual value of superheat is obtained, the difference is used to judge the trend of the target value, and the corresponding electronic expansion valve opening adjustment method is selected according to the result of judging the trend of the target value; a difference interval is preset, and the difference interval corresponds to an electronic expansion valve opening adjustment method, and it is judged whether the obtained difference belongs to the preset difference interval. If so, the corresponding adjustment method is selected for adjustment, and the adjustment method includes but is not limited to this.

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

[0078] The technical solution of an electronic expansion valve opening adjustment method provided by the present application is described below in conjunction with a specific embodiment.

[0079] like Figure 2 As shown, the embodiment of the present application further provides an electronic expansion valve opening adjustment device 210 .

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

[0081] A preset module 211, used to preset a target value of the compressor superheat and a mode for adjusting the opening of the electronic expansion valve;

[0082] In this embodiment, the preset module 211 can be used to execute Figure 1 As shown in step S110, for the specific description of the preset module 211, reference may be made to the description of the step S110.

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

[0084] In this embodiment, the acquisition module 212 can be used to execute Figure 1 As shown in step S120, for a detailed description of the acquisition module 212, reference may be made to the description of step S120.

[0085] A selection module 213, configured to select a mode for adjusting 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 As shown in step S130, for the specific description of the selection module 213, reference may be made to the description of the step S130.

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

[0088] In this embodiment, the adjustment module 214 can be used to perform Figure 1 As shown in step S140 , for a detailed description of the adjustment module 214 , reference may be made to the description of step S140 .

[0089] It can be understood that the above-mentioned device embodiments and the above-mentioned method embodiments can correspond to each other, and similar descriptions of the device embodiments can refer to the method embodiments. To avoid repetition, it will not be repeated here. An electronic expansion valve opening adjustment device provided in an embodiment of the present application can execute an electronic expansion valve opening adjustment method provided in any embodiment of the present application, and has functional modules and beneficial effects corresponding to the execution method. The functional modules of the electronic expansion valve opening adjustment device can be implemented in the form of hardware, can be implemented by instructions in the form of software, and can also be implemented by a combination of hardware and software modules.

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

[0091] Optionally, the software module may be located in a random access memory, a read-only memory, a programmable read-only memory, a flash memory, an electrically erasable programmable memory, a register, or other storage media. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps in the above method embodiment in combination with its hardware.

[0092] The present application embodiment provides an electronic device 310, whose structure is as follows: Figure 3 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 communicated through a bus 315.

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

[0095] Optionally, the electronic device 310 can be connected to a network via a communication module 313 to communicate with other devices, such as a terminal or a server, through the network to achieve data interaction. The electronic device 310 can be various forms of digital computers, such as desktop computers, servers, workstations, mainframe computers or other types of computers. The electronic device 310 can also be various forms of mobile terminals, such as smart phones, tablet computers, wearable devices (such as helmets, glasses, watches, etc.) and other similar mobile terminals.

[0096] Optionally, the electronic device 310 can be connected to the required input / output devices, such as a keyboard, a display device, etc., through the input / output interface 314. The electronic device 310 itself can have a display device, and can also be connected to other display devices 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, so that data in the electronic device 310 can be stored in the storage device, or data in the storage device can be read, and data in the storage device can also be stored in the memory 311. It can be 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 it can be 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 may be divided into one or more modules, which are stored in the memory 311 and executed by the processor 312 to complete the method provided in the embodiment. The one or more modules may be a series of computer program instruction segments capable of completing specific functions, and the computer program instruction segments are used to describe the execution process of the computer program in the electronic device 310.

[0099] Optionally, the processor 312 may be various general and / or special 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 artificial intelligence computing chips, various processors running machine learning model algorithms, and may also be any appropriate controller, microcontroller, processor, etc. The processor 312 executes various methods and processes of this embodiment, illustratively, such as an electronic expansion valve opening adjustment method of an embodiment of the present 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. According to different functions, the bus 315 may be divided into an address bus, a data bus, a control bus, etc.

[0101] In an optional implementation, the embodiment of the present application further provides a computer storage medium on which a computer program is stored, and when the computer program is executed by a computer, the computer can perform the method of the above method embodiment. Part or all of the computer program can be loaded 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 of the embodiment of the present 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, or the like.

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

Claims

1. A method for adjusting the opening of an electronic expansion valve, wherein the electronic expansion valve is used in an air conditioning unit, wherein the air conditioning unit comprises a compressor, an evaporator and a condenser forming a refrigerant cycle with the electronic expansion valve, characterized in that: The method comprises: Presetting a target value of the compressor superheat and a regulating method of the electronic expansion valve opening; Obtaining an actual value of the compressor superheat; Selecting a mode for adjusting the opening of the electronic expansion valve according to a target value of the compressor superheat and an actual value of the compressor superheat; The opening of the electronic expansion valve is adjusted according to the adjustment method of the opening of the electronic expansion valve.

2. The method for adjusting the opening of an electronic expansion valve according to claim 1, characterized in that: The adjustment method for presetting the opening of the electronic expansion valve includes a PID adjustment method and / or a step adjustment method.

3. The method for adjusting the opening of an electronic expansion valve according to claim 1, characterized in that: The method of adjusting the opening of the electronic expansion valve according to the target value of the compressor superheat and the actual value of the compressor superheat includes: Obtaining a difference between a target value of the compressor superheat and an actual value of the compressor superheat; According to the difference, a target value deviation trend is judged to obtain a judgment result; A method for adjusting the opening of the electronic expansion valve is selected according to the judgment result.

4. The method for adjusting the opening of an electronic expansion valve according to claim 3, characterized in that: The step of performing target value deviation trend judgment according to the difference to obtain a judgment result includes: Presetting a target deviation trend value of superheat, wherein the target deviation trend value includes a positive deviation trend value and a negative deviation trend value; The target value deviation trend is judged on the difference according to the positive deviation trend value and the negative deviation trend value to obtain a judgment result.

5. The method for adjusting the opening of an electronic expansion valve according to claim 4, characterized in that: The method of adjusting the opening of the electronic expansion valve according to the judgment result includes: The judgment results include 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 is greater than or equal to the positive deviation trend value; Selecting a PID adjustment method according to the first judgment result, wherein the adjustment period corresponding to the PID adjustment method is the first period; The second judgment result is that the difference is less than or equal to the negative deviation trend value, and is greater than the difference obtained last time; Selecting a PID adjustment mode according to the second judgment result, wherein 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 is smaller than the difference obtained last time; A PID adjustment mode is selected according to the third judgment result, and an adjustment period corresponding to the PID adjustment mode is the third period.

6. The method for adjusting the opening of an electronic expansion valve according to claim 2, characterized in that: The method further comprises: Preset variable values; Setting a difference interval according to the variable value, and setting each difference interval to correspond to an electronic expansion valve opening adjustment mode; Obtaining a difference between a target value of the compressor superheat and an actual value of the compressor superheat; If the difference is within the difference range, a corresponding type of electronic expansion valve opening adjustment method is selected.

7. The method for adjusting the opening of an electronic expansion valve according to claim 6, characterized in that: Each electronic expansion valve opening adjustment method includes an adjustment cycle and an adjustment step frequency of a PID adjustment method and / or a step adjustment method.

8. The method for adjusting the opening of an electronic expansion valve according to claim 1, characterized in that: The preset superheat target value includes: Preset multiple temperature ranges; A target value of superheat is set corresponding to each temperature interval.

9. An electronic expansion valve opening adjustment device, characterized in that: include: A preset module, used for presetting a target value of the compressor superheat and a regulating method of the electronic expansion valve opening; An acquisition module, used for acquiring an actual value of the superheat of the compressor; A selection module, used for selecting a mode for adjusting the opening of the electronic expansion valve according to a target value of the compressor superheat and an actual value of the compressor superheat; The regulating module is used to regulate the opening of the electronic expansion valve according to the regulating method of the opening of the electronic expansion valve.

10. An electronic device, characterized in that: include: a memory for storing 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 1-6.

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