A precise control method, system and storage medium of a pneumatic proportional valve

Abstract

The present application relates to the field of pneumatic proportional valves, and in particular to a precise control method, system and storage medium of a pneumatic proportional valve, which includes obtaining a set flow value, collecting and obtaining an actual flow value; determining an impact coefficient through the set flow value and a preset valve core opening impact threshold; determining an expected diaphragm offset value through the actual flow value, the impact coefficient and a preset impact coefficient; determining an expected diaphragm adjustment value through the expected diaphragm offset value and a preset spring feedback threshold; determining a flow deviation value through the actual flow value and the set flow value; determining an adjustment signal through the flow deviation value, a preset flow start threshold and the expected diaphragm adjustment value, and outputting it. The present application has the effect of improving control accuracy and stability.

Description

Technical Field

[0001] The present application relates to the field of pneumatic proportional valves, and in particular to a precise control method and system of a pneumatic proportional valve and a storage medium thereof. Background Art

[0002] In the field of pneumatic control technology, pneumatic proportional valves have always played a vital role, especially in industrial automation control systems. As a key component for regulating the precise flow of fluids, pneumatic proportional valves are widely used in various fluid control scenarios.

[0003] With the rapid development of digital technology, digital control systems are increasingly used in the field of industrial automation. Digital control systems have high precision, high stability and powerful data processing capabilities, which provide new possibilities for improving the performance of pneumatic proportional valves. However, how to improve the performance of pneumatic proportional valves through digital control technology to comprehensively improve their performance is still an important technical challenge facing this field. Summary of the invention

[0004] In order to improve the problem of how to improve the performance of a pneumatic proportional valve through digital control technology, the present application provides a precise control method and system for a pneumatic proportional valve and a storage medium thereof.

[0005] The present application provides a precise control method for a pneumatic proportional valve, which adopts the following technical solution:

[0006] A precise control method for a pneumatic proportional valve, comprising:

[0007] Get the set flow value and collect the actual flow value;

[0008] Determine the impact coefficient by using the set flow value and a preset valve core opening impact threshold;

[0009] Determine the expected diaphragm displacement value according to the actual flow value, the impact coefficient, and the preset impact coefficient;

[0010] Determining an estimated diaphragm adjustment value by using the estimated diaphragm offset value and a preset spring feedback threshold;

[0011] Determine a flow deviation value by using the actual flow value and the set flow value;

[0012] An adjustment signal is determined and outputted according to the flow deviation value, a preset flow start threshold value and the expected diaphragm adjustment value.

[0013] By adopting the above technical solution, the deviation of the valve core position caused by the impact of flow is reduced, the stability of the valve core is improved through real-time correction, and the detection, calculation, feedback and control of the digital circuit are realized, which is more accurate and safer than the control of the analog circuit.

[0014] Optional, including:

[0015] The actual flow value includes an actual input flow value and an actual output flow value;

[0016] Determine the estimated output flow value by using the actual input flow value and the set flow value;

[0017] Determine the flow channel impurity value by using the actual output flow value and the predicted output flow value;

[0018] The impurity signal is determined by the flow channel impurity value and a preset interference threshold.

[0019] By adopting the above technical solution, it is automatically possible to identify whether there are enough impurities adhering to the inner wall of the flow channel of the valve body, so that the user can clean it as needed.

[0020] Optional, including:

[0021] Get the actual diaphragm position value;

[0022] Determining a theoretical diaphragm position value by using the set flow value and a preset diaphragm position threshold;

[0023] Determine an aging adjustment value by using the theoretical diaphragm position value, the actual diaphragm position value and the estimated diaphragm adjustment value; determine an adjustment value by using the aging adjustment value and a preset adjustment gradient value;

[0024] Re-determining the adjustment value by using the adjustment value and the actual diaphragm position value until the theoretical diaphragm position value is equal to the actual diaphragm position value, and determining a new diaphragm position threshold value;

[0025] The adjustment value is recorded, and the subsequent adjustment values ​​are adjusted starting from the adjustment value.

[0026] By adopting the above technical solution and making additional adjustments based on the calculated degree of aging, the valve core can always be in the position of the non-aged state at different degrees of aging, thereby further improving the stability during operation and extending the service life.

[0027] Optional, including:

[0028] Acquire current and voltage signals;

[0029] Determine the actual output power value through the actual output flow value, the actual diaphragm position and the current and voltage signals;

[0030] Determine the theoretical output power value by the actual output flow value, the actual diaphragm position and a preset initial output power threshold value;

[0031] Determine the internal resistance variable value by using the actual output power value and the theoretical output power value;

[0032] An aging warning signal is determined by the internal resistance variable value and a preset aging internal resistance threshold value, and is output.

[0033] By adopting the above technical solution, the aging degree of the gas supply equipment is automatically calculated, and the user is reminded to repair or replace it, thereby reducing the probability of insufficient output useful power due to excessive internal resistance when more gas is needed due to aging of the gas supply equipment, thereby improving working stability.

[0034] Optional, including:

[0035] The actual diaphragm position value includes the diaphragm center position value and the diaphragm edge position value;

[0036] Determine the diaphragm curvature value by the diaphragm center position value and the diaphragm edge position value;

[0037] The diaphragm aging value is determined by the diaphragm curvature value and a preset diaphragm aging threshold, and a diaphragm early warning signal is output.

[0038] By adopting the above technical solution, the aging degree of the diaphragm is calculated by the curvature generated after the diaphragm is subjected to force, and then an early warning is given to the user, which facilitates the replacement and maintenance of the diaphragm, reduces the probability of control instability caused by diaphragm aging and the user not noticing the abnormality, and further improves work efficiency and stability.

[0039] Optional, including:

[0040] Determine the pressure value by the center position value of the diaphragm;

[0041] Determine the diaphragm bending value by the diaphragm curvature value and the pressure value;

[0042] Determine the diaphragm edge friction value by the last pressure value, the last diaphragm bending value, the last diaphragm curvature value, the current diaphragm bending value, the current diaphragm curvature value, and the current pressure value;

[0043] Determine a theoretical diaphragm bending coefficient by using the diaphragm bending value and the diaphragm edge friction value;

[0044] The diaphragm aging value is determined by the theoretical diaphragm bending coefficient and a preset bending threshold, and a diaphragm early warning signal is output.

[0045] By adopting the above technical solution, the interference of the friction force on the edge of the diaphragm on the curvature of the diaphragm is eliminated, thereby improving the accuracy of the calculation of the diaphragm aging degree.

[0046] The present application provides a precise control system for a pneumatic proportional valve, which adopts the following technical solution:

[0047] A precise control system for a pneumatic proportional valve comprises a valve body, on which a SUP interface for air supply, an OUT interface for air outlet, a pressure interface for detecting pressure, a processing module for data processing, a key module for data interaction with the processing module, and a display module for connecting to the processing module and displaying data are provided. The processing module comprises a plurality of sensors for detection.

[0048] By adopting the above technical solution, digital detection, calculation, feedback and control are realized through the processing module, thereby improving the accuracy of control.

[0049] The present application provides a computer-readable storage medium, which adopts the following technical solution:

[0050] A computer-readable storage medium stores a computer program that can be loaded by a processor and executes a precise control method for a pneumatic proportional valve.

[0051] By adopting the above technical solution, the computer program is stored in a computer-readable storage medium.

[0052] In summary, the present application includes at least one of the following beneficial technical effects:

[0053] 1. Improve the stability of the valve core and realize the detection, calculation, feedback and control of the digital circuit, which is more accurate and safer than the control of the analog circuit.

[0054] 2. The valve core can always be in the position of the non-aging state under different aging degrees, which further improves the stability during operation and prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a flow chart of a precise control method of a pneumatic proportional valve in an embodiment of the present application.

[0056] Figure 2 is a flow chart of step S2.

[0057] Figure 3 It is a flowchart of step S3.

[0058] Figure 4 It is a flowchart of step S4.

[0059] Figure 5 It is a flowchart diagram of step S5.

[0060] Figure 6 It is an overall schematic diagram of a precise control system of a pneumatic proportional valve in an embodiment of the present application.

[0061] Figure 7 It is a module schematic diagram of a precise control system of a pneumatic proportional valve in an embodiment of the present application.

[0062] Explanation of the accompanying drawings: 1. valve body; 11. SUP interface; 12. OUT interface; 13. pressure interface; 14. processing module; 15. button module; 16. display module. DETAILED DESCRIPTION

[0063] The following is combined with Figure 1-7 This application is described in further detail.

[0064] The present application embodiment discloses a precise control method of a pneumatic proportional valve. Figure 1 , the precise control method of the pneumatic proportional valve includes the following steps:

[0065] S1. Get the set flow value and collect the actual flow value;

[0066] S11, determining the impact coefficient by setting the flow value and the preset valve core opening impact threshold;

[0067] S12, determining the expected diaphragm displacement value according to the actual flow value, the impact coefficient, and the preset impact coefficient;

[0068] S13, determining an estimated diaphragm adjustment value by using an estimated diaphragm offset value and a preset spring feedback threshold;

[0069] S14, determining the flow deviation value by comparing the actual flow value with the set flow value;

[0070] S15, determining an adjustment signal through the flow deviation value, a preset flow start threshold value and an expected diaphragm adjustment value, and outputting the signal.

[0071] Detailed: Set the flow value to the data input by the user, which is used to indicate the current required flow value. Set the flow value to the fluid flow rate. The actual flow value is collected in real time by the flow sensors installed on the input and output ends of the pneumatic proportional valve. The valve core opening impact threshold is the relationship between the flow at the input end and the impact generated, or is obtained by looking up the table. For ease of understanding, this embodiment uses a table lookup method to give an example. Assume that the valve core opening impact threshold is [1000-1500, 0.1], [1500-2000, 0.15]. The first table lookup data indicates that when the required input flow is within the range of 1000-1500, for example, the valve core needs to be opened by 1 cm, and then the valve core is opened. When the flow is transmitted after opening 1cm, the impact of the flow will cause the valve core to have an impact coefficient. If the flow value is set to 1200, it will fall within the first table lookup data. At this time, the impact coefficient is 0.1, and the real-time flow value is collected and changed in real time. If the real-time flow value is 1250, it can be calculated that the impact force on the valve core is 1250*0.1=125. The impact coefficient is the displacement caused by the impact on the valve core, which can be obtained by looking up the table or relationship. Suppose the impact coefficient is [100-200, 0.01], [200-300, 0.015]. If 125 falls within the first range, it will cause a deviation displacement of 0.01, which is the expected diaphragm offset value. Suppose the spring If the feedback threshold is 0.1, it means that the spring in the pneumatic proportional valve will resist resetting the offset within 0.1, and 0.01<0.1, so the current expected diaphragm offset value is within the correction range of the spring, so the expected diaphragm adjustment value can be obtained as 0, that is, mechanical correction is performed through the spring without the need for control correction. If the expected diaphragm offset value is not 0.11>0.1, the corresponding expected diaphragm adjustment value will be obtained, so that external force is applied to the diaphragm again to ensure that the valve core can remain in the original position. If the expected diaphragm adjustment value at this time is 0.01 of 0.11-0.1, and the flow start threshold is set to 100, if the actual flow value changes to 1290 at this time, then the flow deviation value can be obtained as 1 290-1200=90<100, there is no need to adjust the expected diaphragm adjustment value. At this time, the adjustment signal is the expected diaphragm adjustment value. If the actual flow value changes to 1310 at this time, the flow deviation value can be obtained as 1310-1200=110>100, which means that the impact force at this time is greater than the starting friction force between the valve core and the inner wall of the valve body (the starting friction force is when the external force is less than this friction force, and it can remain motionless only by friction, and if it is greater, it will start to move). At this time, the expected diaphragm adjustment value will be adjusted to obtain a new adjustment signal. By adjusting the digital signal output of the adjustment signal, the size of the air supply can be adjusted to achieve more precise regulation.

[0072] Reference Figure 2 , further comprising the following steps:

[0073] S2, the actual flow value includes the actual input flow value and the actual output flow value;

[0074] S21, determining the expected output flow value by the actual input flow value and the set flow value;

[0075] S22, determining the flow channel impurity value by using the actual output flow value and the expected output flow value;

[0076] S23, determining an impurity signal based on the flow channel impurity value and a preset interference threshold.

[0077] Details: When it is necessary to test whether there are impurities in the flow channel, the valve core can be raised to the highest position, the valve can be fully opened, and then the set flow value at this time is set as the actual input flow value, so as to obtain the same expected output flow value. If the actual input flow value is set to 5000, then the expected output flow value is 5000. If the actual output flow value is 4950, the flow channel impurity value is 50. If the interference threshold is 10, it means that the flow fluctuation within 10 is normal, because the flow channel in the valve body is not straight, so there will be fluctuations. If 50>10, it means that the flow fluctuation range is exceeded, and it is determined that there are flow channel impurities, so the corresponding impurity signal indicating that there are impurities in the flow channel that are difficult to be cleaned by fluid impact is output to the user.

[0078] Reference Figure 3 , further comprising the following steps:

[0079] S3, obtaining the actual diaphragm position value;

[0080] S31, determining a theoretical diaphragm position value by setting a flow value and a preset diaphragm position threshold;

[0081] S32, determining an aging adjustment value according to a theoretical diaphragm position value, an actual diaphragm position value, and an estimated diaphragm adjustment value;

[0082] S33, determining an adjustment value by comparing the aging adjustment value with a preset adjustment gradient value;

[0083] S34, re-determining the adjustment value by comparing the adjustment value with the actual diaphragm position value until the theoretical diaphragm position value is equal to the actual diaphragm position value, and determining a new diaphragm position threshold;

[0084] S35, recording the adjustment value, and subsequent adjustment values ​​are adjusted starting from this adjustment value.

[0085] Detailed: Through a miniature sensor with detection distance such as a miniature infrared sensor or a miniature laser sensor, the distance between the diaphragm and the inner wall of the pneumatic proportional valve is detected, so as to calculate the position of the diaphragm and obtain the actual diaphragm position value. The diaphragm position threshold is a table stored in the database. By substituting the set flow value into the table, the theoretical diaphragm position value can be obtained. The diaphragm position threshold is set to [1000,1], [2000,1.5]. If the set flow value is 1000, it falls within the first data range, and the theoretical diaphragm position value is 1. This data represents When the flow value is 1000 units, the diaphragm should theoretically be at a position 1 unit away from the sensor. Then the actual diaphragm position value and the theoretical diaphragm position value are calculated to obtain the position deviation value. If the actual diaphragm position value is 1.5, the position deviation value can be 1.5-1=0.5. Then, the expected diaphragm adjustment value is adaptively adjusted to obtain the aging adjustment value in combination with the expected diaphragm adjustment value, so that the aging degree is added to the expected calculation of the diaphragm position. For example, the expected diaphragm adjustment value originally calculated in advance is 1, combined with the position deviation value 0 .5 can be adjusted to 1+0.5=1.5, so that the diaphragm is adjusted to this position, so that the degree of opening of the valve core after long-term use causing the spring or diaphragm to age is the same as the degree of opening of the valve core before aging. The adjustment gradient value is set to 0.1, and then the diaphragm position threshold is adjusted to [1000,1+0.1], [2000,1.5+0.1]. Combined with the actual diaphragm position value, there is still a position deviation value of 1.5-1.1=0.4, and then the diaphragm position threshold is adjusted again to [1000,1.1+0.1 ], [2000,1.6+0.1], and so on, until the diaphragm position threshold is adjusted to [1000,1.5], [2000,2]. At this time, the theoretical diaphragm position is the same as the actual diaphragm position. The final adjustment value is five times (that is, 1.5=1.0+0.1*5), which is stored in the database. If aging causes performance degradation again, the diaphragm position threshold is adjusted directly from this adjustment value, that is, the diaphragm position threshold is adjusted directly from the data [1000,1.5], [2000,2].

[0086] Reference Figure 4 , further comprising the following steps:

[0087] S4, obtaining current and voltage signals;

[0088] S41, determining the actual output power value through the actual output flow value, the actual diaphragm position and the current and voltage signals;

[0089] S42, determining a theoretical output power value through an actual output flow value, an actual diaphragm position and a preset initial output power threshold; S43, determining an internal resistance variable value through the actual output power value and the theoretical output power value;

[0090] S44, determining an aging warning signal through the internal resistance variable value and a preset aging internal resistance threshold, and outputting the signal.

[0091] In detail: the current and voltage signals obtained can be the current and voltage values ​​of the equipment used to input air pressure. If an air pump is used, it is the current or voltage value required by the air pump to overcome the original air pressure in the pneumatic proportional valve. For example, there are already two atmospheric pressures of gas in the pneumatic proportional valve. If it is still necessary to continue to control the sliding of the valve core, and if it is necessary to continue to input air, then the pressure required by the air pump to input the same volume of gas is greater than when there is only one atmospheric pressure of gas in the pneumatic proportional valve. Therefore, a larger current or voltage is required to generate a greater pressure; if the current and voltage signals are 5A and 200V, the actual output power value can be calculated to be 1000W, and then the corresponding actual output flow value and the actual diaphragm are recorded. Position, then the corresponding actual output flow value and the actual diaphragm position are looked up in the table within the initial output power threshold to obtain the theoretical output power value. Assuming the initial output power threshold is [actual output flow value, actual diaphragm position, 1100W], the initial output power threshold is 1100W, and the actual diaphragm position at this time is the position of the diaphragm in the non-aging state obtained after the aging adjustment in the previous step S3. If the actual output flow value does not correspond to the actual diaphragm position, the aging warning calculation is performed through the next step S5 or the non-aging restoration calculation is performed through S3; then the power difference can be calculated to be 1100-1000=100W, and then the internal resistance variable value can be calculated. There are two calculation formulas, which are or The internal resistance variable value is calculated, that is, the change in internal resistance compared with the initial state, usually the increase, and then the internal resistance variable value is compared with the aging internal resistance threshold. Usually, if the internal resistance variable value is greater than the aging internal resistance threshold, it means that the internal resistance of the external device used to provide air pressure is seriously aged, and an aging warning signal is output to the user to replace the equipment.

[0092] Reference Figure 5 , further comprising the following steps:

[0093] S5, the actual diaphragm position value includes the diaphragm center position value and the diaphragm edge position value;

[0094] S51, determining the diaphragm curvature value by the diaphragm center position value and the diaphragm edge position value;

[0095] S52, determining the pressure value by the center position value of the diaphragm;

[0096] S53, determining the diaphragm bending value according to the diaphragm curvature value and the pressure value;

[0097] S54, determining the diaphragm edge friction value according to the previous pressure value, the previous diaphragm bending value, the previous diaphragm radian value, the current diaphragm bending value, the current diaphragm radian value, and the current pressure value;

[0098] S55, determining a theoretical diaphragm bending coefficient by using the diaphragm bending value and the diaphragm edge friction value;

[0099] S56, determining the diaphragm aging value by using the theoretical diaphragm bending coefficient and a preset bending threshold, and outputting a diaphragm early warning signal.

[0100] In detail: The aging threshold of the diaphragm includes the bending threshold. When the diaphragm is displaced by air pressure, since the valve core is usually connected to the center of the diaphragm and the diaphragm has a certain flexibility to ensure sealing, it is inevitable that there will be different forces between the center and edge of the diaphragm, and the edge also rubs against the inner wall of the pneumatic proportional valve to achieve airtightness, thereby causing the diaphragm to produce an arc. The diaphragm arc value, that is, the arc of the diaphragm at this time, can be calculated by detecting the diaphragm center position value and the diaphragm edge position value, and the pressure value can also be calculated by the diaphragm center position. Since the valve core is connected to the center of the diaphragm, the displacement of the diaphragm center is the displacement of the valve core, so the pressure force at the center of the diaphragm is the effective pressure. The diaphragm bending value is the calculation coefficient of the arc generated when the diaphragm is subjected to pressure. For example, if the pressure value is 1000N and the diaphragm arc value is 15°, then the diaphragm bending value at this time is 15 / 1000=0.015° / N; if displacement occurs at the edge of the diaphragm The pressure value at the previous moment is 800N. If the diaphragm curvature value is 8°, that is, the previous diaphragm curvature value, the diaphragm bending value at the previous second can be obtained to be 0.01° / N, that is, the previous diaphragm bending value. Since the diaphragm center at the previous moment was displaced but the edge was not displaced, and the edge was displaced at the next moment, the diaphragm edge friction that needs to be overcome for the diaphragm edge to slide is 1000-800=200N. Then, after excluding the friction force on the diaphragm edge, the theoretical diaphragm bending coefficient under the ideal condition where there is no diaphragm edge friction can be obtained, for example, 15 / (1000-200)=0.01875° / N. Then, this data is compared with the bending threshold value to obtain the diaphragm aging value, that is, to judge whether the diaphragm is aged. For example, after the diaphragm is used for a long time, it ages and hardens. Then, when it is subjected to the same pressure, the curvature will be smaller, which also makes the bending value smaller. A diaphragm early warning signal is output to the user so that the diaphragm can be replaced.

[0101] The present application embodiment discloses a precise control system for a pneumatic proportional valve. Figure 6 and Figure 7The precise control system of the pneumatic proportional valve includes a valve body 1, which is provided with a SUP interface 11 for air supply, an OUT interface 12 for air outlet, and a pressure interface 13 for detecting pressure. The valve body 1 is also equipped with a processing module 14 for data processing, a key module 15 for data interaction with the processing module 14, and a display module 16 for connecting to the processing module 14 and displaying data. The sensor in the accompanying drawing may represent a pressure gauge connected to the pressure interface 13, and also includes other sensors in the processing module 14, such as a sensor for detecting an actual flow value and a sensor for detecting an actual diaphragm position value.

[0102] The processing module 14 includes a processor for data processing and a database for storing data and calling by the processor. The processor may include a central processing unit such as a CPU or an MPU or a host system built with a CPU or an MPU as the core, including hardware or software. After the meter has a processor, people can freely control the metering instrument by programming so that it can run according to people's wishes. The processor can control local measurement transmission, remote measurement transmission, remote communication, etc. through internal protocols. Internal protocols generally refer to all protocols that realize mutual communication or linking within the same metering instrument or the same system, including: human-computer interaction protocols, software / hardware (interface) protocols, chip bus (C-Bus) protocols, internal bus (I-Bus) protocols, etc. Some or all protocols. With the development of integrated circuit technology, some of the protocols belonging to the external bus (E-Bus) protocol are also classified as internal protocols after the external bus (E-Bus) is integrated into the chip.

[0103] The display module 16 can be an LED screen or a liquid crystal screen, and the button module 15 can be a micro switch to input various threshold values ​​(spring feedback threshold values, etc.) or set flow values ​​or power on / off instructions and other data to the processor.

[0104] The embodiment of the present application discloses a computer-readable storage medium, wherein the computer-readable storage medium includes a computer program that can be loaded by a processor and execute a precise control method for a pneumatic proportional valve.

[0105] Computer-readable storage media include, for example, various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0106] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A precise control method for a pneumatic proportional valve, characterized in that: include: Get the set flow value and collect the actual flow value; Determine the impact coefficient by using the set flow value and a preset valve core opening impact threshold; Determine the expected diaphragm displacement value according to the actual flow value, the impact coefficient, and the preset impact coefficient; Determining an estimated diaphragm adjustment value by using the estimated diaphragm offset value and a preset spring feedback threshold; Determine a flow deviation value by using the actual flow value and the set flow value; An adjustment signal is determined and outputted according to the flow deviation value, the preset flow start threshold value and the expected diaphragm adjustment value.

2. The precise control method of a pneumatic proportional valve according to claim 1, characterized in that: include: The actual flow value includes an actual input flow value and an actual output flow value; Determine the expected output flow value by using the actual input flow value and the set flow value; Determine the flow channel impurity value by using the actual output flow value and the predicted output flow value; The impurity signal is determined by the flow channel impurity value and a preset interference threshold.

3. The precise control method of a pneumatic proportional valve according to claim 2, characterized in that: include: Get the actual diaphragm position value; Determining a theoretical diaphragm position value by using the set flow value and a preset diaphragm position threshold; Determine an aging adjustment value by using the theoretical diaphragm position value, the actual diaphragm position value, and the predicted diaphragm adjustment value; Determining an adjustment value by using the aging adjustment value and a preset adjustment gradient value; Re-determining the adjustment value by using the adjustment value and the actual diaphragm position value until the theoretical diaphragm position value is equal to the actual diaphragm position value, and determining a new diaphragm position threshold value; The adjustment value is recorded, and the subsequent adjustment values ​​are adjusted starting from the adjustment value.

4. The precise control method of a pneumatic proportional valve according to claim 3 is characterized in that: include: Acquire current and voltage signals; Determine the actual output power value through the actual output flow value, the actual diaphragm position and the current and voltage signal; Determine the theoretical output power value through the actual output flow value, the actual diaphragm position and a preset initial output power threshold; Determine the internal resistance variable value by using the actual output power value and the theoretical output power value; An aging warning signal is determined by the internal resistance variable value and a preset aging internal resistance threshold value, and is output.

5. The precise control method of a pneumatic proportional valve according to claim 3, characterized in that: include: The actual diaphragm position value includes the diaphragm center position value and the diaphragm edge position value; Determine the diaphragm curvature value by the diaphragm center position value and the diaphragm edge position value; The diaphragm aging value is determined by the diaphragm curvature value and a preset diaphragm aging threshold, and a diaphragm early warning signal is output.

6. The precise control method of a pneumatic proportional valve according to claim 5, characterized in that: include: Determine the pressure value by the center position value of the diaphragm; Determine the diaphragm bending value by the diaphragm curvature value and the pressure value; Determine the diaphragm edge friction value by the last pressure value, the last diaphragm bending value, the last diaphragm curvature value, the current diaphragm bending value, the current diaphragm curvature value, and the current pressure value; Determine a theoretical diaphragm bending coefficient by using the diaphragm bending value and the diaphragm edge friction value; The diaphragm aging value is determined by the theoretical diaphragm bending coefficient and a preset bending threshold, and a diaphragm early warning signal is output.

7. A precise control system for a pneumatic proportional valve, according to the precise control method for a pneumatic proportional valve according to claim 1, characterized in that: The invention comprises a valve body (1), wherein the valve body (1) is provided with a SUP interface (11) for supplying air, an OUT interface (12) for discharging air, a pressure interface (13) for detecting pressure, a processing module (14) for performing data processing, a key module (15) for performing data interaction with the processing module (14), and a display module (16) for connecting to the processing module (14) and displaying data, wherein the processing module (14) comprises a plurality of sensors for detection.

8. A computer-readable storage medium, characterized in that: The computer program is stored which can be loaded by a processor and executes the precise control method of the pneumatic proportional valve according to any one of claims 1 to 6.

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