Fault diagnosis system and method for electric regulating valve, and electric regulating valve

Abstract

The application provides a fault diagnosis system and method of an electric regulating valve and the electric regulating valve. The signal acquisition device of the fault diagnosis system is connected with the electric regulating valve. The signal acquisition device comprises at least one of the following: a force sensor and an electric parameter sensor. The force sensor is connected with a valve rod of the electric regulating valve and is used for measuring a valve rod thrust of the valve rod. The electric parameter sensor is connected with a driving motor of the electric regulating valve and is used for measuring an electric parameter of the driving motor. The control equipment is used for collecting parameters of the valve rod thrust and the electric parameter, and then sending the collected parameters to an upper computer. The upper computer is used for performing fault diagnosis on the electric regulating valve based on the collected parameters. The application can perform real-time fault diagnosis on the electric regulating valve and greatly improve the fault diagnosis precision.

Description

Technical Field

[0001] This application relates to the field of valve monitoring technology, and in particular to a fault diagnosis system, method and electric control valve for an electric control valve. Background Technology

[0002] The intelligent status monitoring system for electric ball valves belongs to the field of valve intelligence and control systems and equipment health monitoring and predictive maintenance. It is used in systems such as petrochemical, steel, power, gas, water supply and wastewater treatment for status monitoring and remote fault prediction of electric control valves.

[0003] In related technologies, electric control valves, as important components of pipeline fluid control, typically rely on manual inspections or periodic maintenance for condition monitoring. Clearly, the lack of real-time monitoring can lead to the failure to detect potential faults in a timely manner, and common faults in electric control valves, such as jamming, leakage, or sluggish operation, directly impact the efficiency and safety of the production system. Summary of the Invention

[0004] This application provides a fault diagnosis system, method, and electric control valve for an electric control valve. By installing a force sensor and an electrical parameter sensor in the electric control valve, the system measures the summative parameters of the electric control valve. Based on the summative parameters, the system can perform real-time fault diagnosis of the electric control valve, thereby achieving automated fault diagnosis of the electric control valve and greatly improving the accuracy of fault diagnosis.

[0005] The technical solution of this application embodiment is implemented as follows:

[0006] This application provides a fault diagnosis system for an electric regulating valve, comprising: a signal acquisition device, a control device, and a host computer connected in sequence; the signal acquisition device is connected to the electric regulating valve, and the signal acquisition device includes at least one of the following: a force sensor and an electrical parameter sensor; wherein, the force sensor is connected to the valve stem of the electric regulating valve and is used to measure the valve stem thrust; the electrical parameter sensor is connected to the drive motor of the electric regulating valve and is used to measure the electrical parameters of the drive motor; the control device is used to summarize the valve stem thrust and the electrical parameters, and then send the summarized parameters to the host computer; the host computer is used to perform fault diagnosis on the electric regulating valve based on the summarized parameters.

[0007] In the above scheme, the signal acquisition device further includes a displacement sensor; the displacement sensor is connected to the valve stem; the displacement sensor is used to acquire the valve stroke signal of the electric regulating valve and transmit the acquired valve stroke signal to the control device.

[0008] In the above scheme, the displacement sensor is a pull-wire displacement sensor; one end of the pull-wire displacement sensor is fixedly connected to the valve body of the electric regulating valve, and the other end of the pull-wire displacement sensor is fixedly connected to the valve stem crossbeam of the electric regulating valve.

[0009] In the above scheme, the control device is further configured to: convert the valve stroke signal to obtain the displacement curve of the electric regulating valve; determine the valve position of the electric regulating valve at the current moment based on the displacement curve; determine the stroke curve amplitude of the electric regulating valve within the preset time period based on the displacement curve; determine the stroke frequency of the electric regulating valve within the preset time period based on the displacement curve; and summarize the valve position, the stroke curve amplitude, and the stroke frequency into the summary parameter.

[0010] In the above scheme, before performing signal conversion on the valve stroke signal to obtain the displacement curve of the electric regulating valve, the control device is further configured to: perform low-pass and high-pass filtering on the valve stroke signal to obtain a filtered signal; correspondingly, the control device is further configured to: perform signal conversion on the filtered signal to obtain the displacement curve of the electric regulating valve.

[0011] In the above scheme, the host computer is further configured to: determine the opening / closing degree of the electric regulating valve based on the valve position, and determine whether the electric regulating valve has an opening / closing fault based on the opening / closing degree; determine a first difference between the valve stem thrust and the normal value of the valve stem thrust, and determine whether the electric regulating valve has a valve stem thrust fault based on the first difference and a first preset threshold; determine whether the electric regulating valve has a stroke amplitude fault based on the stroke curve amplitude and the valve position average amplitude threshold; wherein, the valve position average amplitude threshold is determined based on the stroke curve amplitude and preset parameters within the preset time period; determine a second difference between the stroke frequency and the normal frequency, and determine whether the electric regulating valve has a stroke frequency fault based on the second difference and a second preset threshold; determine the current power of the drive motor based on the electrical parameters; determine a third difference between the current power and the normal power, and determine whether the electric regulating valve has a power abnormality based on the third difference and a third preset threshold.

[0012] In the above scheme, the electrical parameter sensor includes a voltage sensor and a current sensor; the voltage measuring clip of the voltage sensor is clamped to any two of the three-phase power lines of the drive motor; the current clamp of the current sensor is clamped to any one of the three-phase power lines of the drive motor; the voltage sensor is used to measure the voltage of the drive motor; the current sensor is used to measure the current of the drive motor; the voltage and the current constitute the electrical parameters of the drive motor.

[0013] In the above scheme, the control device includes: a voltage converter, a voltage transmitter, a fiber optic demodulator, and a data acquisition card; the voltage converter is used to convert the power supply voltage of the control device into the power supply voltage required by the control device; the voltage transmitter is used to convert the voltage measured by the voltage sensor into a target voltage value located within the target voltage range; the fiber optic demodulator is used to receive the sensor signal collected by the force sensor and determine the valve stem thrust based on the sensor signal; the data acquisition card is used to receive at least one of the following: the valve stroke signal collected by the displacement sensor, the current collected by the current sensor, and the target voltage value converted by the voltage transmitter.

[0014] In the above scheme, the aggregated parameters include at least one of the following parameters: valve stem thrust, voltage of the drive motor, current of the drive motor, target voltage value, valve position of the electric regulating valve at the current moment, stroke curve amplitude of the electric regulating valve within a preset time period, and stroke frequency of the electric regulating valve within the preset time period; the host computer is also used to: store and display at least one of the aggregated parameters.

[0015] In the above scheme, the host computer is also used to: output alarm information when it is determined from the summarized parameters that the electric regulating valve has any at least one of the following types of faults: opening / closing fault, valve stem thrust fault, stroke amplitude fault, stroke frequency fault and power abnormality.

[0016] This application provides a fault diagnosis method for an electric control valve, applied to the aforementioned fault diagnosis system for the electric control valve. The method includes: collecting the valve stem thrust of the electric control valve and the electrical parameters of the drive motor of the electric control valve; summarizing the valve stem thrust and the electrical parameters to obtain summarized parameters; and performing fault diagnosis on the electric control valve based on the summarized parameters.

[0017] In the above scheme, the method further includes: acquiring the valve stroke signal of the electric regulating valve; performing signal conversion on the valve stroke signal to obtain the displacement curve of the electric regulating valve; determining the valve position of the electric regulating valve at the current moment based on the displacement curve; determining the stroke curve amplitude of the electric regulating valve within the preset time period based on the displacement curve; determining the stroke frequency of the electric regulating valve within the preset time period based on the displacement curve; and summarizing the valve position, the stroke curve amplitude, and the stroke frequency into the summarization parameter.

[0018] In the above scheme, the fault diagnosis of the electric regulating valve based on the summarized parameters includes: determining the opening / closing degree of the electric regulating valve based on the valve position in the summarized parameters, and determining whether the electric regulating valve has an opening / closing fault based on the opening / closing degree and a preset degree threshold; determining a first difference between the valve stem thrust and the normal value of the valve stem thrust in the summarized parameters, and determining whether the electric regulating valve has a valve stem thrust fault based on the first difference and a first preset threshold; determining whether the electric regulating valve has a stroke amplitude fault based on the stroke curve amplitude and the valve position average amplitude threshold in the summarized parameters; wherein, the valve position average amplitude threshold is determined based on the stroke curve amplitude and preset parameters within the preset time period; determining a second difference between the stroke frequency and the normal frequency in the summarized parameters, and determining whether the electric regulating valve has a stroke frequency fault based on the second difference and a second preset threshold; determining the current power of the drive motor based on the electrical parameters in the summarized parameters; determining a third difference between the current power and the normal power, and determining whether the electric regulating valve has a power abnormality based on the third difference and a third preset threshold.

[0019] This application provides an electric regulating valve, which is connected to the fault diagnosis system of the aforementioned electric regulating valve, and the fault diagnosis method is used to diagnose the faults of the electric regulating valve.

[0020] The embodiments of this application have the following beneficial effects:

[0021] The fault diagnosis system, method, and electric control valve provided in this application have several advantages. Firstly, by using force sensors and electrical parameter sensors installed in the electric control valve, a summary parameter of the valve is measured. Based on this summary parameter, real-time fault diagnosis of the electric control valve is achieved, realizing automated fault diagnosis. Furthermore, since the summary parameter can be sent to the host computer in real time by the control device for fault diagnosis, the accuracy of fault diagnosis is greatly improved. Secondly, because the force sensor is connected to the valve stem of the electric control valve, the valve stem thrust can be accurately measured. Thus, based on the installation relationship between the force sensor and the electric control valve, the data in the summary parameter can be accurately measured, further improving the accuracy of fault diagnosis when performing fault diagnosis based on the summary parameter. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the fault diagnosis system for the electric regulating valve provided in the embodiments of this application;

[0023] Figure 2This is a schematic diagram of the specific structure of the fault diagnosis system for the electric regulating valve provided in the embodiments of this application;

[0024] Figure 3 This is a flowchart illustrating the fault diagnosis method for an electric regulating valve provided in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] Fault diagnosis system for electric regulating valve: 10; Signal acquisition device: 11; Force sensor: 111; Electrical parameter sensor: 112; Voltage measuring clip: 1121; Current clamp: 1122; Displacement sensor: 113; Control device: 12; Voltage converter: 121; Voltage transmitter: 122; Fiber optic demodulator: 123; Data acquisition card: 124; Host computer: 13; Electric regulating valve: 20; Valve stem: 201; Drive motor: 202; Valve stem crossbeam: 203; Valve body: 204; Electric actuator: 200. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0029] In the following description, the terms "first / second / third" are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0030] In the embodiments of this application, the term "module" or "unit" refers to a part of a structure that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuitry or memory) or a combination thereof.

[0031] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the embodiments of this application is for the purpose of describing the embodiments of this application only and is not intended to limit this application.

[0032] In the context of Industry 4.0, fault diagnosis and monitoring systems for electric control valves are increasingly integrated with industrial control systems (e.g., Distributed Control Systems (DCS) and Supervisory Control and Data Acquisition (SCADA)), providing higher-precision monitoring and diagnostic capabilities for the automated control of industrial processes. This application provides an intelligent status detection and fault diagnosis system for electric control valves, specifically addressing major accidents frequently caused by electric control valve malfunctions in current engineering practice. This fault diagnosis system consists of a host computer, control equipment, and signal acquisition devices. The electric control valve fault diagnosis system provided in this application will be described in detail below.

[0033] Figure 1 This is a schematic diagram of the overall structure of the fault diagnosis system for the electric regulating valve provided in the embodiments of this application. Figure 2 This is a schematic diagram of the specific structure of the fault diagnosis system for the electric regulating valve provided in the embodiments of this application. The following will be combined with... Figure 1 and Figure 2 The fault diagnosis system is described.

[0034] See Figure 1 and Figure 2 The fault diagnosis system 10 for the electric regulating valve includes: a signal acquisition device 11, a control device 12, and a host computer 13 connected in sequence.

[0035] The signal acquisition device 11 is connected to the electric control valve 20. The electric control valve is an important industrial automation control component. The electric control valve 20 uses an electric actuator to precisely regulate parameters such as flow rate, pressure, and temperature of fluid media (e.g., water, oil, gas). The electric control valve 20 mainly consists of two parts: the valve body 204 and the electric actuator 200. The valve body is the core of the electric control valve. Depending on the application and medium, the material, structure, and design of the valve body will vary. The valve body is responsible for achieving the functions of fluid shut-off, regulation, or control. The electric actuator 200 is the power device that drives the valve body. The electric actuator 200 receives signals from the control system (such as DCS or SCADA systems) and converts these signals into mechanical motion to control the opening and closing of the valve. The electric actuator 200 can be directly connected to the drive motor 202, which drives the movement of the electric actuator 200.

[0036] According to their function and application, electric regulating valves 20 can be classified into the following categories: linear electric regulating valves (suitable for precise flow regulation of media), angle electric regulating valves (suitable for media with high pressure differential, high viscosity, or containing solid particles), and butterfly electric regulating valves (suitable for flow regulation of large-diameter pipelines). The electric regulating valve 20 in this embodiment can be any type of electric regulating valve. Precise regulation of the media can be achieved through electric regulating valves, meeting the precise control requirements for parameters such as flow, pressure, and temperature in industrial production; furthermore, electric regulating valves can receive remote control signals to achieve remote automatic control, facilitating operation and management.

[0037] In this embodiment, the signal acquisition device 11 is connected to the electric regulating valve 20, which can be a direct connection between the signal acquisition device 11 and the valve body 204 and the electric actuator 200 of the electric regulating valve 20.

[0038] The signal acquisition device 11 includes at least one of the following: a force sensor 111 and an electrical parameter sensor 112.

[0039] Force sensor 111 is connected to valve stem 201 of electric regulating valve 20, and is used to measure valve stem thrust of valve stem 201. In a specific implementation, force sensor 111 can be fixedly connected to valve stem 201. For example, force sensor 111 can be welded to valve stem 201 to achieve a fixed connection between force sensor 111 and valve stem 201.

[0040] In one feasible implementation, the force sensor 111 can be implemented using a fiber Bragg grating sensor, with its output connected to the control device 12 via an optical fiber cable. A fiber Bragg grating sensor is an optical sensor that utilizes fiber Bragg grating technology to achieve sensing functionality. The fiber Bragg grating sensor detects the valve stem thrust of the valve stem 201 by creating one or more grating structures in an optical fiber and modulating the reflection or transmission characteristics of light waves using these structures. When the force sensor 111 is implemented as a fiber Bragg grating sensor, its working principle is based on the selective reflection or transmission of light wavelengths by the fiber Bragg grating. When light emitted from a broadband light source passes through the fiber Bragg grating, light of a specific wavelength is reflected or transmitted; this specific wavelength is called the Bragg wavelength. When the fiber Bragg grating is affected by external physical parameters (such as the valve stem thrust of the valve stem 201), the Bragg wavelength changes accordingly. By detecting the change in the Bragg wavelength, the change in the valve stem thrust of the external valve stem 201 can be determined.

[0041] The force sensor 111 can be implemented using any of the following fiber Bragg grating sensors: a fiber Bragg grating sensor (FBG) (which measures the sensitivity of the valve stem thrust of the valve stem 201 using a fiber Bragg grating), or a long-period fiber grating sensor (LPG) (compared to FBG, LPG sensors have different characteristics, such as higher temperature stability, and are suitable for specific sensing applications. LPG sensors utilize the characteristics of long-period fiber gratings to sense changes in the valve stem thrust of the valve stem 201. Unlike fiber Bragg gratings, long-period fiber gratings mainly rely on mode coupling principles to transmit rather than reflect light of a specific wavelength, and their periods are longer, typically greater than 10 micrometers).

[0042] In this embodiment, a fiber Bragg grating sensor is used to measure the valve stem thrust of the valve stem 201. The fiber Bragg grating sensor has the characteristics of electromagnetic interference resistance (the fiber Bragg grating sensor does not depend on electrical signals and is therefore not affected by electromagnetic interference), high sensitivity (the fiber Bragg grating sensor can detect minute changes in valve stem thrust), miniaturization and lightweight (the fiber Bragg grating sensor is small in size, light in weight, and easy to install and integrate), corrosion resistance and intrinsic safety (the fiber optic material itself has good chemical stability and corrosion resistance, and is suitable for use in harsh environments, for example, it is suitable for use in electric regulating valves 20 with corrosive media). Therefore, using a fiber Bragg grating sensor to measure the valve stem thrust of the valve stem 201 can not only ensure the accuracy of the measured valve stem thrust of the valve stem 201, but also improve the universality of the electric regulating valve 20.

[0043] In another feasible implementation, the force sensor 111 can be specifically implemented using a metal-encapsulated fiber Bragg grating sensor. A metal-encapsulated fiber Bragg grating sensor refers to encapsulating the fiber Bragg grating sensor in a metal housing to provide additional mechanical protection, environmental isolation, and improved sensor performance. This encapsulation method enables the fiber Bragg grating sensor to operate under more demanding environmental conditions, such as high temperature, high pressure, and corrosive chemicals. Metal-encapsulated fiber Bragg grating sensors possess at least the following characteristics and advantages: mechanical protection (the metal housing provides robust protection for the fiber Bragg grating, capable of withstanding physical shocks and vibrations, preventing fiber damage), environmental isolation (the metal enclosure effectively isolates the fiber Bragg grating from environmental factors such as moisture, dust, and corrosive gases, protecting it from damage), thermal management (metal has good thermal conductivity, which helps dissipate heat from the fiber Bragg grating and maintain the sensor's operating temperature range), electromagnetic shielding (the metal housing shields against electromagnetic interference, improving the sensor's anti-interference capability), dimensional stability (the metal enclosure provides good dimensional stability, helping to maintain precise alignment of the fiber Bragg grating), high reliability (the metal enclosure improves the long-term reliability of the sensor, reducing the frequency of maintenance and replacement), and convenient installation (the metal enclosure is designed with easy-to-install interfaces and brackets, facilitating on-site installation and integration).

[0044] In this embodiment, the fiber Bragg grating sensor may first be metal-encapsulated, and then the resulting metal-encapsulated fiber Bragg grating sensor may be welded to the valve stem 201 of the electric regulating valve 20. The metal encapsulation process for the fiber Bragg grating sensor may include the following steps: Fiber Bragg grating fabrication: writing the grating structure onto the optical fiber; Housing preparation: preparing the metal housing and performing necessary cleaning and pretreatment; Fiber fixing: fixing the fiber Bragg grating inside the housing, ensuring accurate alignment; Sealing: sealing the housing using welding, sealant, or other methods to ensure environmental isolation; Performance testing: performing performance testing on the encapsulated sensor to ensure it meets specifications.

[0045] The electrical parameter sensor 112 is connected to the drive motor 202 of the electric regulating valve 20 and is used to measure the electrical parameters of the drive motor 202. In practice, the electrical parameter sensor 112 can also be connected to the electric actuator 200, which is electrically connected to the drive motor 202, and the electrical parameters of the drive motor 202 can be measured through the three-phase power line between the drive motor 202 and the electric actuator 200.

[0046] It should be noted that the electric control valve 20 includes an electric actuator 200. The electric actuator 200 is a key component that drives the electric control valve. When the electric actuator 200 malfunctions, it will affect the normal operation of the entire electric control valve. Therefore, it is also necessary to measure the electrical parameters of the drive motor 202 that drives the electric actuator 200 in order to diagnose the fault of the electric actuator 200.

[0047] In this embodiment, the electric actuator faults mainly include: actuator not responding to control signals, slow actuator response or incomplete action, actuator overheating, excessive actuator noise, actuator fault protection activation, control signal fluctuations causing unstable actuator action, actuator internal control circuit faults, actuator power supply faults, and actuator control circuit board faults. This embodiment measures the electrical parameters of the drive motor 202 using the electrical parameter sensor 112, which can at least predict and diagnose the aforementioned electric actuator faults.

[0048] In some embodiments, the electrical parameter sensor 112 includes a voltage sensor and a current sensor. The voltage sensor's voltage measuring clip 1121 is clamped to any two of the three-phase power lines of the drive motor 202; the current sensor's current clamp 1122 is clamped to any one of the three-phase power lines of the drive motor 202. The voltage sensor is used to measure the voltage of the drive motor 202; the current sensor is used to measure the current of the drive motor 202. The measured voltage and current constitute the electrical parameters of the drive motor 202.

[0049] After measuring the voltage and current of the drive motor 202, the voltage and current of the drive motor 202 can be sent to the control device 12.

[0050] In some embodiments, the signal acquisition device 11 may further include a displacement sensor 113; the displacement sensor 113 is connected to the valve stem. The displacement sensor 113 is a sensor used to measure changes in the position of an object, used to acquire the valve stroke signal of the electric regulating valve 20, and transmit the acquired valve stroke signal to the control device 12. Displacement sensors include the following types: linear displacement sensor, potentiometer-type displacement sensor, magnetoelectric displacement sensor, inductive displacement sensor, angular displacement sensor, rotary potentiometer, magnetostrictive displacement sensor, optical displacement sensor, laser displacement sensor, interferometer, ultrasonic displacement sensor, capacitive displacement sensor, eddy current displacement sensor, fiber optic displacement sensor, microelectromechanical system (MEMS) displacement sensor, and grating-type displacement sensor.

[0051] In this embodiment, the displacement sensor 113 can be implemented as a pull-wire displacement sensor; one end of the pull-wire displacement sensor is fixedly connected to the valve body 204 of the electric regulating valve, and the other end of the pull-wire displacement sensor is fixedly connected to the valve stem beam 203 of the electric regulating valve 20. The valve stroke signal of the electric regulating valve 20 can be collected through the pull-wire displacement sensor.

[0052] Here, the valve stroke signal of the electric control valve 20 refers to the signal used to indicate the current open or closed position of the electric control valve 20. This signal is typically obtained by the displacement sensor 113 measuring the movement of the valve stem 201 driven by the electric actuator. The valve stroke signal is a feedback signal that reflects the actual opening degree of the valve driven by the electric actuator during the regulation process. This signal can be an analog signal or a digital signal. For analog signals, it can be represented as 4-20mA, which is an analog current signal, where 4mA represents the valve fully closed and 20mA represents the valve fully open; or it can be represented as 1-5VDC, which is a voltage signal, also used to indicate the open and closed positions of the valve. For digital signals, it can include, for example, an on / off signal, which is usually represented in binary, such as a high level indicating the valve is open and a low level indicating the valve is closed; or it can include a position feedback signal, such as a pulse signal generated by an encoder or position sensor, which can more accurately indicate the valve position.

[0053] The valve stroke signal not only allows for monitoring of the valve position, enabling the control system of the electric regulating valve 20 to monitor the valve's opening or closing status in real time, but also enables closed-loop control. In this closed-loop control system, the valve stroke signal is used to provide feedback to the control algorithm, ensuring that the actual valve position matches the set position. Furthermore, it can be used for fault diagnosis in this embodiment of the application, helping to detect faults in the electric regulating valve, such as jamming or leakage.

[0054] In this embodiment, the displacement sensor 113 can transmit the collected valve stroke signal to the control device 12. The transmission method of the valve stroke signal can be any of the following: wired transmission, that is, transmitting the signal from the electric actuator to the control unit through a cable or wire; or wireless transmission, that is, using wireless communication technology to transmit the valve stroke signal.

[0055] After acquiring the valve stem thrust and electrical parameters, the control device 12 summarizes the valve stem thrust and electrical parameters and sends the summarized parameters to the host computer 13.

[0056] Here, parameter summarization is a process of organizing, analyzing, and summarizing large amounts of data or information. When summarizing valve stem thrust and electrical parameters, control device 12 can use any of the following methods: list summarization, which arranges parameters in a list according to a certain order for easy and intuitive viewing and understanding; tabular summarization, which organizes parameters in a table format, including parameter name, unit, value, and remarks; graph summarization, which uses graphs to show the relationships or trends between parameters; group summarization, which groups parameters according to certain rules and then summarizes each group; and statistical summarization, which performs statistical calculations on the parameters, such as average, sum, maximum, minimum, and standard deviation.

[0057] In the implementation process, when the control device 12 receives the valve stroke signal collected by the displacement sensor 113, it can also perform the following processing steps: First, the valve stroke signal is converted to obtain the displacement curve of the electric regulating valve; then, the valve position of the electric regulating valve at the current moment is determined based on the displacement curve; the stroke curve amplitude of the electric regulating valve within a preset time period is determined based on the displacement curve; the stroke frequency of the electric regulating valve within a preset time period is determined based on the displacement curve; finally, the valve position, stroke curve amplitude, and stroke frequency are also summarized into the summary parameters.

[0058] Here, signal conversion of the valve stroke signal to obtain the displacement curve of the electric control valve typically involves the following steps: acquiring the valve stroke signal in analog or digital form; signal amplification, if the valve stroke signal is weak, it may need to be amplified to meet the needs of subsequent processing and display; signal filtering, to reduce noise and interference, the valve stroke signal can be filtered, common filtering methods include low-pass filtering, high-pass filtering, band-pass filtering, etc.; signal conversion, converting the analog signal into a digital signal. If the valve stroke signal is an analog signal, it needs to be converted into a digital signal by an analog-to-digital converter (ADC) for digital processing. During digital signal processing, if the valve stroke signal is a digital signal, further processing can be performed, such as data calibration and noise reduction. Afterwards, signal analysis is performed. Data analysis software or programming languages ​​can be used to analyze the digital signal, extract displacement data, and plot the displacement curve. When plotting the curve, the analyzed displacement data can be plotted as a curve graph, typically with the horizontal axis representing time or control signal and the vertical axis representing the displacement of the electric control valve 20.

[0059] The displacement curve of an electric control valve is a graphical representation of the valve's displacement changing with time or a control signal. Analyzing the displacement curve reveals the valve's operational characteristics, such as response speed, stability, and accuracy. Specifically, the slope of the displacement curve reflects the valve's response speed to the control signal; the smoothness of the curve reflects its stability, such as the presence of overshoot or oscillation; and the accuracy of the displacement curve reflects the valve's operational accuracy, i.e., the deviation between the actual and expected displacement.

[0060] In this embodiment of the application, the valve position of the electric regulating valve at the current moment can be determined based on the displacement curve. On the displacement curve, the corresponding displacement value can be read according to the current time point, and this displacement value is the valve position of the electric regulating valve at the current moment.

[0061] In this embodiment, the stroke curve amplitude of the electric regulating valve within a preset time period can also be determined based on the displacement curve. When determining the stroke curve amplitude, the maximum and minimum displacement values ​​within the preset time period can be found on the displacement curve. The difference between the maximum and minimum displacement values ​​is the stroke curve amplitude. In other words, the difference between the maximum and minimum displacement values ​​can be calculated to obtain the stroke curve amplitude, which represents the maximum range of movement of the electric regulating valve within the preset time period.

[0062] In this embodiment, the stroke frequency of the electric regulating valve within a preset time period can also be determined based on the displacement curve. When determining the stroke frequency, the complete stroke of the electric regulating valve from opening to closing (or from closing to opening) can be identified and marked on the displacement curve. This typically involves finding the peaks and troughs on the curve, or determining the start and end points of the stroke through a threshold setting. Then, the number of complete strokes on the displacement curve within the preset time period is determined. Each time the valve moves from a fully closed state to a fully open state (or vice versa) is counted as one complete stroke. Finally, the number of complete strokes is divided by the total duration of the preset time period (usually in seconds) to obtain the stroke frequency (strokes / second).

[0063] In some embodiments, before converting the valve stroke signal to obtain the displacement curve of the electric regulating valve, the control device 12 may further perform the following processing steps: perform low-pass and high-pass filtering on the valve stroke signal to obtain a filtered signal. Thus, when the control device 12 converts the valve stroke signal to obtain the displacement curve of the electric regulating valve, it can perform signal conversion on the filtered signal to obtain the displacement curve of the electric regulating valve.

[0064] Please continue reading Figure 2In some embodiments, the control device 12 may specifically include: a voltage converter 121, a voltage transmitter 122, an optical fiber demodulator 123, and a data acquisition card 124.

[0065] Voltage converter 121 is used to convert the power supply voltage of control device 12 to the power supply voltage required by control device 12. Voltage converter 121 can convert a signal at one voltage level to a signal at another voltage level. Voltage converters are commonly used in circuits to ensure that different components or subsystems can exchange signals correctly, especially between components with different voltage requirements. The power supply voltage can be 220V, and the power supply voltage required by control device 12 can be 24V. Voltage converter 121 converts the 220V power supply voltage of control device 12 to the 24V power supply voltage required by control device 12. This 24V power supply voltage powers voltage converter 121 and data acquisition card 124 in control device 12.

[0066] The voltage converter 121 in this embodiment can be implemented using a buck converter, which converts a high-voltage input to a low-voltage output. The buck converter converts the input voltage to the required lower voltage by controlling the switching of transistors.

[0067] Voltage transmitter 122 is used to convert the voltage measured by a voltage sensor into a target voltage value within a target voltage range. The voltage transmitter converts high-voltage signals into standardized low-voltage output signals for measurement, control, and monitoring. Key features and functions of the voltage transmitter include: signal conversion, converting high-voltage signals into standardized low-voltage output signals, such as 0-10V; providing electrical isolation to prevent interference or faults on the high-voltage side from affecting equipment and systems on the low-voltage side; linear output, ensuring a linear relationship between the output signal and the input voltage for precise control; high accuracy and stability for accurate voltage measurement; safety functions such as overload protection and short-circuit protection to ensure equipment and personnel safety; and a wide input range to accommodate a wide range of input voltages to meet the needs of different applications.

[0068] In this embodiment, since the electric actuator for the electric regulating valve 20 provides a voltage of 380V, and the control device 12 can only process small voltage signals, a voltage transmitter 122 can be used to convert the voltage measured by the voltage sensor into a target voltage value within the target voltage range. The target voltage range can be, for example, a voltage range of 0-10V.

[0069] The voltage converter 121 of this application embodiment can be implemented using any of the following types of voltage converters: AC voltage transmitter (for converting AC voltage signals into standardized DC voltage output), DC voltage transmitter (for converting DC voltage signals into standardized DC voltage output), differential voltage transmitter (for measuring the difference between two voltages and converting it into a standardized output signal), and isolation voltage transmitter (providing a high level of electrical isolation to protect the safety of downstream equipment and personnel).

[0070] The fiber optic demodulator 123 is used to receive the sensor signal collected by the force sensor 111 and determine the valve stem thrust based on the sensor signal. In this embodiment, since the force sensor 111 can be implemented as a fiber Bragg grating sensor or a metal-encapsulated fiber Bragg grating sensor, the sensor signal received by the fiber optic demodulator 123 can be an optical wavelength.

[0071] A fiber optic demodulator is an instrument used to measure and analyze the reflection spectrum of fiber Bragg gratings (FBGs) or fiber Bragg grating sensors. A fiber Bragg grating is a microstructure etched into an optical fiber that reflects light of a specific wavelength back when it passes through it. The demodulator determines changes in physical quantities such as strain of the FBG by measuring the wavelength changes of this reflected light. For example, it can determine valve stem thrust. The functions of a fiber optic demodulator include, but are not limited to: wavelength measurement (measuring the center wavelength of the reflected light from the FBG); data conversion (converting wavelength changes into measured values ​​of physical quantities such as valve stem thrust); data transmission (transmitting readings via different communication protocols such as Ethernet, PROFIBUS, or CANbus); and data processing (storing, analyzing, or exporting data using a software interface).

[0072] The data acquisition card 124 is used to receive at least one of the following: valve stroke signal acquired by displacement sensor 114, current acquired by current sensor, and target voltage value converted by voltage transmitter 122.

[0073] In this embodiment of the application, the parameters that the control device 12 can obtain may include at least one of the following: valve stem thrust, voltage of the drive motor, current of the drive motor, target voltage value, valve position of the electric regulating valve at the current moment, stroke curve amplitude of the electric regulating valve within a preset time period, and stroke frequency of the electric regulating valve within a preset time period.

[0074] The host computer 13 is used to perform fault diagnosis on the electric regulating valve 20 based on the summarized parameters.

[0075] When performing specific fault diagnosis, the electric regulating valve 20 can be diagnosed based on the following diagnostic methods:

[0076] Method 1: Opening / Closing Fault Diagnosis: The degree of opening / closing of the electric control valve can be determined based on the valve position, and the presence of an opening / closing fault can be determined based on the degree of opening / closing. For example, if the valve position is between 5% and 95%, it is determined that the valve is not fully closed or not fully open, i.e., an opening / closing fault exists.

[0077] Method 2: Valve Stem Thrust Fault Diagnosis: This method determines the first difference between the valve stem thrust and its normal value, and based on this first difference and a first preset threshold, identifies whether the electric control valve has a valve stem thrust fault. For example, it can determine whether the first difference between the valve stem thrust and its normal value is greater than 15%. If it exceeds 15%, a warning of abnormal thrust is issued; if it exceeds 25%, an alarm for valve stem thrust fault is triggered.

[0078] Method 3: Stroke Amplitude Fault Diagnosis: This method determines whether the electric control valve has a stroke amplitude fault based on the stroke curve amplitude and the valve position average amplitude threshold. The valve position average amplitude threshold is determined based on the stroke curve amplitude and preset parameters within a preset time period. For example, the normal valve stroke curve amplitude x can be used to determine if the valve position average amplitude is greater than the valve position average amplitude threshold A+Bx, where A is 1% and B is 30%. If it exceeds this threshold, an alarm for a stroke amplitude fault is triggered.

[0079] Method 4: Stroke Frequency Fault Diagnosis: A second difference between the stroke frequency and the normal frequency can be determined, and based on this second difference and a second preset threshold, it can be determined whether the electric regulating valve has a stroke frequency fault. For example, the normal frequency can be taken as y; if it exceeds y by 5%, it is judged as an abnormal stroke frequency, and if it exceeds 10%, an alarm for a stroke frequency fault will be triggered.

[0080] Method 5: Power Anomaly Diagnosis: The current power of the drive motor can be determined based on electrical parameters; a third difference between the current power and the normal power can be determined, and based on the third difference and a third preset threshold, it can be determined whether there is a power anomaly in the electric regulating valve. For example, the motor power can be calculated using the current and voltage of the electric actuator, and then compared with the normal power. If the deviation between the current power and the normal power exceeds 15%, it is determined to be a power anomaly.

[0081] In this embodiment, the host computer 13 can also be used to store and display the summarized parameters. Furthermore, since the parameters obtainable by the control device 12 can include at least one of the following: valve stem thrust, drive motor voltage, drive motor current, target voltage value, valve position of the electric regulating valve at the current moment, stroke curve amplitude of the electric regulating valve within a preset time period, and stroke frequency of the electric regulating valve within a preset time period, the host computer 13 can also be used to store and display at least one of the above-mentioned parameters in the summarized parameters.

[0082] In some embodiments, the host computer 13 can also be used to: output alarm information when it is determined, based on the summarized parameters, that the electric regulating valve has any of the following types of faults: opening / closing fault, valve stem thrust fault, stroke amplitude fault, stroke frequency fault and power abnormality.

[0083] Here, when issuing an alarm, the fault alarm information may include: fault type, fault location, fault occurrence time, etc. Alarm formats may include at least one of the following: visual alarms: including flashing LEDs, indicator lights on the dashboard, pop-up windows on the screen, etc.; auditory alarms: such as buzzers, alarm sounds, etc.; SMS alarms: alarm information sent via SMS; email alarms: alarm information sent via email; instant messaging alarms: alarm information sent via instant messaging software; application alarms: alarm information sent via customized applications; audible and visual alarms: alarms combining sound and light, typically used in emergencies; log recording: the system automatically records alarm events for subsequent analysis and investigation.

[0084] When issuing alarms, alarm information can also be managed. Alarm management includes, but is not limited to: alarm suppression: preventing the repeated sending of the same alarm information and reducing interference; alarm escalation: automatically escalating the alarm level when the problem persists or becomes more serious; alarm merging: merging related alarm information into one alarm to reduce the number of alarms; alarm filtering: filtering out unnecessary alarm information according to preset rules; alarm notification: notifying operators through various means (such as SMS, email, APP, etc.).

[0085] The fault diagnosis system for the electric regulating valve provided in this application first monitors the state of the electric regulating valve. This is achieved by welding a force sensor, implemented as a fiber Bragg grating sensor or a metal-encapsulated fiber Bragg grating sensor, onto the valve stem to measure the valve stem thrust. A pull-wire displacement sensor measures the valve stem displacement. The electric regulating valve uses 380V three-phase power; a voltage transmitter measures the valve voltage (i.e., the drive motor voltage), and a current clamp measures the valve current (i.e., the drive motor current). The signals from the electric regulating valve are integrated in the control box (i.e., the control equipment), and the data is uploaded to a host computer via serial port and Modbus protocol. The host computer displays and saves the data. Simultaneously, the host computer contains an algorithm that can diagnose valve faults based on the monitored parameters.

[0086] The diagnostic principle of the fault diagnosis system lies in acquiring the valve stem stroke, drive motor current, and valve stem thrust through a condition monitoring system. First, the stroke signal is smoothed by performing low-pass and high-pass filtering. Valve fault diagnosis includes various types: opening / closing faults, valve stem thrust faults, stroke amplitude faults, stroke frequency faults, and power anomalies.

[0087] The innovations of the fault diagnosis system for the electric control valve provided in this application include, but are not limited to, at least one of the following: (1) A metal-encapsulated fiber optic grating sensor (i.e., a force sensor) is used to directly measure the valve stem thrust, resulting in more accurate data and no need to change the structure of the electric control valve, thus achieving in-situ measurement. (2) A fault diagnosis system for the control valve is proposed, which can assess the health status of the electric control valve by monitoring relevant parameters and determine whether the electric control valve has malfunctioned.

[0088] Specifically, the fault diagnosis system for the electric control valve consists of sensors (i.e., signal acquisition devices), a control box (i.e., control equipment), and a host computer. The sensors include metal-encapsulated fiber Bragg grating sensors, displacement sensors, voltage transmitters, and current clamps. The metal-encapsulated fiber Bragg grating sensors are welded to the valve stem and connected to the control box via fiber optic cables. A pull-wire displacement sensor is bolted to the electric control valve, with one end of its pull wire fixed to the valve stem crossbeam. The electric actuator of the electric control valve is driven by three-phase electricity. The voltage of the drive motor is the voltage between any two wires, and the current of the drive motor is the current of any one wire. By clamping any two wires with a voltage measuring clamp, the 380V voltage can be converted to 0-10V via the voltage transmitter in the control box; the current of the drive motor can be measured by clamping a single wire with the current clamp.

[0089] The control box includes a data acquisition card, a voltage converter, a voltage transmitter, and a fiber optic demodulator. The data acquisition card receives voltage signals from the displacement sensor, current clamp, and voltage transmitter (after conversion), and uploads the data to the host computer via USB. The voltage converter converts external 220V voltage to the 24V power supply required by the data acquisition card and the voltage converter itself. The fiber optic demodulator receives the wavelength from the metal-encapsulated fiber Bragg grating sensor, calculates the valve stem thrust using a formula, and uploads the data to the host computer via the Modbus protocol. Data storage, display, and fault diagnosis are performed on the host computer (13).

[0090] Based on the above embodiments of the fault diagnosis system for electric control valves, this application further provides a fault diagnosis method for electric control valves. Figure 3 This is a flowchart illustrating a fault diagnosis method for an electrically controlled valve provided in an embodiment of this application. This fault diagnosis method can be applied to the aforementioned fault diagnosis system for electrically controlled valves, such as... Figure 3 As shown, the method includes the following steps S101 to S103:

[0091] Step S101: The valve stem thrust of the electric regulating valve and the electrical parameters of the drive motor of the electric regulating valve are collected by the signal acquisition device of the fault diagnosis system.

[0092] Step S102: The control equipment of the fault diagnosis system summarizes the valve stem thrust and electrical parameters to obtain the summarized parameters, and sends the summarized parameters to the host computer of the fault diagnosis system.

[0093] Step S103: The host computer performs fault diagnosis on the electric regulating valve based on the summarized parameters.

[0094] In some embodiments, the valve stroke signal of the electric control valve can be acquired, and then the valve stroke signal can be converted to obtain the displacement curve of the electric control valve. Then, the valve position of the electric control valve at the current moment can be determined based on the displacement curve. The amplitude of the stroke curve of the electric control valve within a preset time period can be determined based on the displacement curve. The stroke frequency of the electric control valve within a preset time period can be determined based on the displacement curve. The valve position, stroke curve amplitude and stroke frequency are then summarized into a summary parameter.

[0095] Here, step S103, where the host computer performs fault diagnosis on the electric regulating valve based on the summarized parameters, can include the following diagnostic methods: Determining the opening / closing degree of the electric regulating valve based on the valve position in the summarized parameters, and determining whether the electric regulating valve has an opening / closing fault based on the opening / closing degree and a preset degree threshold. Determining a first difference between the valve stem thrust in the summarized parameters and the normal value of the valve stem thrust, and determining whether the electric regulating valve has a valve stem thrust fault based on the first difference and a first preset threshold. Determining whether the electric regulating valve has a stroke amplitude fault based on the stroke curve amplitude in the summarized parameters and the valve position average amplitude threshold; wherein, the valve position average amplitude threshold is determined based on the stroke curve amplitude within a preset time period and preset parameters. Determining a second difference between the stroke frequency in the summarized parameters and the normal frequency, and determining whether the electric regulating valve has a stroke frequency fault based on the second difference and a second preset threshold. Determining the current power of the drive motor based on the electrical parameters in the summarized parameters; determining a third difference between the current power and the normal power, and determining whether the electric regulating valve has a power anomaly based on the third difference and a third preset threshold.

[0096] It should be noted that the specific implementation details of each step in the fault diagnosis method of the electric regulating valve can be referred to the explanation in the above embodiment of the fault diagnosis system of the electric regulating valve. The explanation of each component (such as signal acquisition device, control equipment and host computer, and other components) in the fault diagnosis system of the electric regulating valve is also applicable to the fault diagnosis method of the electric regulating valve in this application embodiment. Therefore, the implementation details of the fault diagnosis method of the electric regulating valve in this application embodiment will not be repeated in this embodiment.

[0097] The fault diagnosis method for electric control valves provided in this application is applied to the aforementioned fault diagnosis system for electric control valves. In this system, force sensors and electrical parameter sensors installed within the electric control valve measure the summarized parameters of the valve. This allows the fault diagnosis method to perform real-time fault diagnosis based on these summarized parameters, achieving automated fault diagnosis. Furthermore, since the summarized parameters can be sent to the host computer in real-time by the control device, the accuracy of fault diagnosis is greatly improved. Additionally, because the force sensor is connected to the valve stem in the fault diagnosis system, the valve stem thrust can be accurately measured. Based on the installation relationship between the force sensor and the electric control valve, the data in the summarized parameters can be accurately measured, further improving the accuracy of fault diagnosis when performing fault diagnosis based on these summarized parameters.

[0098] In some embodiments, based on the above-described fault diagnosis system and fault diagnosis method embodiments for electric control valves, this application provides another electric control valve that can be connected to the above-described fault diagnosis system for electric control valves and fault diagnosis can be performed on the electric control valve using the above-described fault diagnosis method.

[0099] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this application are included within the scope of protection of this application.

[0100] It should be understood that the phrases "one embodiment" or "some embodiments" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0101] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A fault diagnosis system for an electric regulating valve, characterized in that, include: The signal acquisition device, control equipment, and host computer are connected in sequence. The signal acquisition device is connected to the electric regulating valve, and the signal acquisition device includes at least one of the following: a force sensor and an electrical parameter sensor; wherein, the force sensor is connected to the valve stem of the electric regulating valve and is used to measure the valve stem thrust of the valve stem; the electrical parameter sensor is connected to the drive motor of the electric regulating valve and is used to measure the electrical parameters of the drive motor. The control device is used to summarize the valve stem thrust and the electrical parameters, and then send the summarized parameters to the host computer. The host computer is used to diagnose faults in the electric regulating valve based on the summarized parameters.

2. The system according to claim 1, characterized in that, The signal acquisition device further includes a displacement sensor; the displacement sensor is connected to the valve stem. The displacement sensor is used to collect the valve stroke signal of the electric regulating valve and transmit the collected valve stroke signal to the control device.

3. The system according to claim 2, characterized in that, The displacement sensor is a wire-type displacement sensor; One end of the pull-wire displacement sensor is fixedly connected to the valve body of the electric regulating valve, and the other end of the pull-wire displacement sensor is fixedly connected to the valve stem crossbeam of the electric regulating valve.

4. The system according to claim 2, characterized in that, The control device is also used for: The valve stroke signal is converted to obtain the displacement curve of the electric regulating valve; The valve position of the electric regulating valve at the current moment is determined based on the displacement curve. The amplitude of the stroke curve of the electric regulating valve within the preset time period is determined based on the displacement curve. The stroke frequency of the electric regulating valve within the preset time period is determined based on the displacement curve. The valve position, the stroke curve amplitude, and the stroke frequency are summarized into the summary parameters.

5. The system according to claim 4, characterized in that, Before converting the valve stroke signal to obtain the displacement curve of the electric regulating valve, the control device is also used for: The valve stroke signal is subjected to low-pass and high-pass filtering to obtain a filtered signal; Accordingly, the control device is also used to: perform signal conversion on the filtered signal to obtain the displacement curve of the electric regulating valve.

6. The system according to claim 4, characterized in that, The host computer is also used for: The degree of opening / closing of the electric regulating valve is determined based on the valve position, and the degree of opening / closing is used to determine whether the electric regulating valve has an opening / closing fault. Determine a first difference between the valve stem thrust and the normal value of the valve stem thrust, and based on the first difference and a first preset threshold, determine whether the electric regulating valve has a valve stem thrust fault; Based on the stroke curve amplitude and the valve position average amplitude threshold, it is determined whether the electric regulating valve has a stroke amplitude fault; wherein, the valve position average amplitude threshold is determined based on the stroke curve amplitude and preset parameters within the preset time period; Determine a second difference between the stroke frequency and the normal frequency, and based on the second difference and a second preset threshold, determine whether the electric regulating valve has a stroke frequency fault; The current power of the drive motor is determined based on the electrical parameters; a third difference between the current power and the normal power is determined, and based on the third difference and a third preset threshold, it is determined whether the electric regulating valve has a power abnormality.

7. The system according to any one of claims 2 to 6, characterized in that, The electrical parameter sensor includes a voltage sensor and a current sensor; The voltage measuring clip of the voltage sensor is clamped to any two of the three-phase power lines of the drive motor; the current clamp of the current sensor is clamped to any one of the three-phase power lines of the drive motor. The voltage sensor is used to measure the voltage of the drive motor; the current sensor is used to measure the current of the drive motor; the voltage and the current constitute the electrical parameters of the drive motor.

8. The system according to claim 7, characterized in that, The control equipment includes: a voltage converter, a voltage transmitter, an optical fiber demodulator, and a data acquisition card; The voltage converter is used to convert the power supply voltage of the control device into the power supply voltage required by the control device. The voltage transmitter is used to convert the voltage measured by the voltage sensor into a target voltage value located within the target voltage range; The fiber optic demodulator is used to receive the sensor signal collected by the force sensor and determine the valve stem thrust based on the sensor signal. The data acquisition card is used to receive at least one of the following: the valve stroke signal acquired by the displacement sensor, the current acquired by the current sensor, and the target voltage value converted by the voltage transmitter.

9. The system according to claim 8, characterized in that, The aggregated parameters include at least one of the following parameters: valve stem thrust, voltage of the drive motor, current of the drive motor, target voltage value, valve position of the electric regulating valve at the current moment, stroke curve amplitude of the electric regulating valve within a preset time period, and stroke frequency of the electric regulating valve within the preset time period. The host computer is also used to: store and display at least one parameter among the summarized parameters.

10. The system according to claim 9, characterized in that, The host computer is also used for: When the electric regulating valve is determined to have at least one of the following types of faults based on the summarized parameters: opening / closing fault, valve stem thrust fault, stroke amplitude fault, stroke frequency fault, and power abnormality, an alarm message is output.

11. A fault diagnosis method for an electric regulating valve, characterized in that, The fault diagnosis system applied to the electric regulating valve according to any one of claims 1 to 10, the method comprising: The valve stem thrust of the electric regulating valve and the electrical parameters of the drive motor of the electric regulating valve are collected. The valve stem thrust and the electrical parameters are summarized to obtain the summarized parameters; The electric regulating valve is diagnosed based on the summarized parameters.

12. The method according to claim 11, characterized in that, The method further includes: Collect the valve stroke signal of the electric regulating valve; The valve stroke signal is converted to obtain the displacement curve of the electric regulating valve; The valve position of the electric regulating valve at the current moment is determined based on the displacement curve. The amplitude of the stroke curve of the electric regulating valve within the preset time period is determined based on the displacement curve. The stroke frequency of the electric regulating valve within the preset time period is determined based on the displacement curve. The valve position, the stroke curve amplitude, and the stroke frequency are summarized into the summary parameters.

13. The method according to claim 12, characterized in that, The fault diagnosis of the electric regulating valve based on the summarized parameters includes: The opening / closing degree of the electric regulating valve is determined based on the valve position in the summarized parameters, and the presence of an opening / closing fault in the electric regulating valve is determined based on the opening / closing degree and a preset degree threshold. Determine the first difference between the valve stem thrust and the normal value of valve stem thrust in the summarized parameters, and determine whether the electric regulating valve has a valve stem thrust fault based on the first difference and a first preset threshold. Based on the stroke curve amplitude and valve position average amplitude threshold in the summarized parameters, it is determined whether the electric regulating valve has a stroke amplitude fault; wherein, the valve position average amplitude threshold is determined based on the stroke curve amplitude and preset parameters within the preset time period; Determine a second difference between the stroke frequency and the normal frequency in the summarized parameters, and based on the second difference and a second preset threshold, determine whether the electric regulating valve has a stroke frequency fault; The current power of the drive motor is determined based on the electrical parameters in the summarized parameters; a third difference between the current power and the normal power is determined, and based on the third difference and a third preset threshold, it is determined whether the electric regulating valve has a power abnormality.

14. An electric regulating valve, characterized in that, The electric regulating valve is connected to the fault diagnosis system of the electric regulating valve according to any one of claims 1 to 10, and the electric regulating valve is fault diagnosed by the fault diagnosis method of the electric regulating valve according to any one of claims 11 to 13.

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