Flow feedback-based electric butterfly valve segmented control method and system

Abstract

The application discloses a flow feedback-based electric butterfly valve segmented regulation method and system, and relates to the technical field of intelligent control. The method comprises the following steps: collecting the deviation of the target flow and the measured flow, and taking the flow deviation as a control target; identifying the curve inflection point based on the flow-opening curve, dividing the gradient control interval according to the flow deviation and the curve inflection point, and obtaining a plurality of gradient control intervals, each of which corresponds to a preset opening; setting a proportional fine-tuning strategy according to the belonging gradient of the target flow in the gradient control interval; and performing adaptive control on the electric butterfly valve according to the plurality of gradient control intervals and the proportional fine-tuning strategy. The technical problems that the control precision of the hard-sealed electric butterfly valve is insufficient, the opening cannot be dynamically and accurately adjusted according to the flow deviation, and the flow regulation response is slow in the prior art are solved, the flow deviation is finely and adaptively adjusted, and the technical effects of improving the flow control precision and the response speed are achieved.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology, specifically to a method and system for segmented control of electric butterfly valves based on flow feedback. Background Technology

[0002] Electric butterfly valves, as fluid control devices, are widely used in various industries such as petroleum, chemical, power, and water treatment. With their simple structure, high adjustment accuracy, and fast response, electric butterfly valves have become an important tool for flow control. However, in practical applications, due to the complexity of flow changes and the requirements for control precision, traditional electric butterfly valve control methods often suffer from problems such as inaccurate adjustment and unstable response. Especially under conditions requiring high flow adjustment precision, existing control methods struggle to adapt to changes in target flow, leading to low system efficiency and even over- or under-adjustment. Summary of the Invention

[0003] This application provides a segmented control method and system for electric butterfly valves based on flow feedback, which solves the technical problems of insufficient control accuracy and difficulty in dynamically and accurately adjusting the opening degree according to flow deviation in existing hard-seal electric butterfly valves, resulting in slow flow regulation response.

[0004] The first aspect of this application provides a method for segmented control of an electric butterfly valve based on flow feedback, the method comprising: The deviation between the target flow rate and the measured flow rate is collected, and the flow rate deviation is used as the control target. Based on the flow rate-opening curve, the inflection point of the curve is identified. Multiple tiered control intervals are obtained according to the flow rate deviation and the inflection point, with each tier corresponding to a preset opening. A proportional fine-tuning strategy is set according to the tier to which the target flow rate belongs in the tiered control interval. This proportional fine-tuning strategy is activated only when the flow rate deviation decreases to a preset fine-tuning threshold. Adaptive control of the electric butterfly valve is performed based on the multiple tiered control intervals and the proportional fine-tuning strategy. When the flow rate deviation is within the tiered control interval, a tiered control mode is used; when the flow rate deviation enters the fine-tuning threshold range, the proportional fine-tuning mode is switched to.

[0005] A second aspect of this application provides a segmented control system for an electric butterfly valve based on flow feedback, the system comprising: Data acquisition module: Collects the deviation between the target flow rate and the measured flow rate, using the flow deviation as the control target; Control interval division module: Identifies the inflection point of the flow-opening curve, and divides the control interval into multiple levels based on the flow deviation and the inflection point, each level corresponding to a preset opening; Setting module: Sets a proportional fine-tuning strategy based on the level to which the target flow rate belongs in the control interval, wherein the proportional fine-tuning strategy is activated only when the flow deviation is reduced to within a preset fine-tuning threshold range; Control module: Performs adaptive control of the electric butterfly valve based on the multiple level control intervals and the proportional fine-tuning strategy, wherein when the flow deviation is within the level control interval, a level control mode is used, and when the flow deviation enters the fine-tuning threshold range, the proportional fine-tuning mode is switched.

[0006] One or more technical solutions provided in this application have at least the following technical effects or advantages: First, the deviation between the target flow rate and the measured flow rate is collected, and this flow deviation is used as the control target. Next, based on the flow-opening curve, the inflection point of the curve is identified. Multiple tiered control intervals are obtained based on the flow deviation and the inflection point, with each interval corresponding to a preset opening degree. Then, a proportional fine-tuning strategy is set according to the tier to which the target flow rate belongs within the tiered control interval. This strategy is activated only when the flow deviation decreases to a preset fine-tuning threshold. Finally, adaptive control of the electric butterfly valve is performed based on the multiple tiered control intervals and the proportional fine-tuning strategy. When the flow deviation is within the tiered control interval, a tiered control mode is used; when the flow deviation enters the fine-tuning threshold range, the proportional fine-tuning mode is switched to. This solves the technical problems of insufficient control accuracy and difficulty in dynamically and accurately adjusting the opening degree according to the flow deviation in existing hard-seal electric butterfly valves, resulting in slow flow regulation response. By finely adjusting the tiered adaptive adjustment based on the flow deviation, the technical effect of improving flow control accuracy and response speed is achieved. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 A schematic flowchart of a segmented control method for an electric butterfly valve based on flow feedback, provided in an embodiment of this application; Figure 2 A schematic diagram of the segmented control system for an electric butterfly valve based on flow feedback, provided in an embodiment of this application.

[0009] Explanation of reference numerals in the attached diagram: Data acquisition module 11, control interval division module 12, setting module 13, control module 14. Detailed Implementation

[0010] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0011] It should be noted that the terms "comprising" and "having" are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to these processes, methods, products, or devices.

[0012] Example 1, as Figure 1 As shown, this application provides a segmented control method for an electric butterfly valve based on flow feedback, wherein the method includes: The deviation between the target flow rate and the measured flow rate is collected, and the flow rate deviation is used as the control target.

[0013] In the control process of the electric butterfly valve, the target flow rate under the target operating condition and the actual measured flow rate during operation are synchronously collected by the flow detection unit installed on the pipeline. The target flow rate is obtained from the process setpoint or the output of the upper control system, while the measured flow rate is obtained by the flow sensor continuously collecting data within a preset sampling period and then filtering it. Within the same control period, the target flow rate and the measured flow rate are timestamped to ensure that they are compared and analyzed under the same time reference. The flow deviation is calculated based on the aligned target flow rate and the measured flow rate. The flow deviation is used to characterize the degree of deviation of the current actual flow rate from the target flow rate. It is calculated as the difference between the target flow rate and the measured flow rate or the deviation value after normalization. The flow deviation is used as the control target input to the electric butterfly valve control unit, so that the control unit determines the direction and adjustment range of the valve opening adjustment based on the deviation, thereby forming a closed-loop control input with the flow deviation as the core driving variable. This provides a basic control basis for subsequent control interval division and control strategy switching based on the deviation amplitude.

[0014] Based on the flow-opening curve, the inflection point of the curve is identified. According to the flow deviation and the inflection point of the curve, the tiered control interval is divided to obtain multiple tiered control intervals. Each tiered control interval corresponds to a preset opening.

[0015] Based on the pre-calibrated flow-opening curve, a discrete sampling method is used to obtain a set of flow data points corresponding to different opening degrees, and the data points are sorted according to the direction of increasing opening degree. On this basis, the ratio of flow increments between adjacent data points is calculated, i.e., the rate of flow change caused by a unit change in opening degree. This rate of change is then subjected to sliding window differential processing. When the difference in the rate of change between adjacent intervals exceeds a preset threshold, the opening degree position is determined as an inflection point of the curve, where the inflection point characterizes the boundary position where the flow response characteristics undergo significant changes. Using the inflection point as the segment boundary, the entire opening degree range is divided into multiple continuous basic opening degree segment intervals. Within each segment interval, a corresponding flow-opening sensitivity coefficient is calculated based on the local flow change relationship. This flow-opening sensitivity coefficient is obtained by comparing the flow difference between adjacent discrete points with the opening degree difference. The ratio of values ​​is used to characterize the degree of influence of unit opening change on flow rate change within the interval. Further, the real-time collected flow deviation is used as the input control quantity. The corresponding sensitivity coefficient is selected according to the opening segment interval where the current valve is located, and the flow deviation is converted in reverse based on the sensitivity coefficient to obtain the corresponding opening demand change, thereby obtaining the target opening demand value. Then, the target opening demand value is compared with the boundary range of each basic opening segment interval. When the target opening demand value falls into a certain basic opening segment interval, the interval is determined as the current target tiered control interval, and the tiered control interval is bound to the preset opening value, thereby forming multiple tiered control intervals that match the flow deviation response characteristics, realizing a graded control structure for electric butterfly valves that combines curve characteristic segmentation and deviation back-calculation control.

[0016] The flow-opening curve is obtained through pre-test calibration, specifically including: during the valve's factory delivery or system commissioning phase, the electric butterfly valve is installed in a standard test pipeline, and multiple different opening control points are set under stable pressure conditions. These opening control points cover the entire valve stroke range, and the valve opening is adjusted step by step using equal intervals or dense sampling. Under each set opening state, after the fluid flow stabilizes, the corresponding steady-state flow value is collected through the flow detection unit, and the correspondence between the opening and the flow is recorded simultaneously. The collected multiple opening-flow corresponding data points are organized to form a discrete characteristic dataset, and sorted according to the direction of increasing opening. Further, the discrete data points are smoothed and anomaly removal is performed to eliminate the influence of test disturbances and transient fluctuations, thereby obtaining the basic flow-opening curve data characterizing the valve's flow response characteristics, which is used as the basis for subsequent flow deviation calculation and segmented control interval division.

[0017] Furthermore, based on the flow deviation and the inflection point of the curve, the tiered control intervals are divided to obtain multiple tiered control intervals, including: Based on the inflection point of the curve, the valve opening step range is determined; the opening demand control quantity is determined according to the matching of the flow deviation and the flow-opening curve; the opening demand control quantity is projected onto the valve opening step range to obtain the matching step range; the step control range is divided according to the projection position of the matching step range to obtain the step control range.

[0018] By analyzing the slope changes of the flow-opening curve, the locations where the flow rate changes significantly are identified as inflection points. These inflection points serve as the boundary for dividing the opening space, dividing the full valve opening range into multiple valve opening tiers. Based on this, and according to the real-time collected flow deviation, combined with the flow change amplitude relationship corresponding to each opening in the flow-opening curve, the required opening control quantity to achieve the target flow correction is determined. Further, this opening control quantity is projected onto the valve opening axis, mapping it to the valve opening tiers divided by the inflection points, and the target tier position is determined based on the projection result. Finally, based on the distribution order of the target tiers throughout the opening range, the valve opening space is reconstructed in segments, forming multiple tiered control intervals. Each tiered control interval corresponds to a preset stable opening value for subsequent graded adjustment control. A proportional fine-tuning strategy is set according to the tier to which the target flow belongs in the tiered control interval, whereby the proportional fine-tuning strategy is activated only when the flow deviation decreases to within a preset fine-tuning threshold range.

[0019] Specifically, based on the deviation between the target flow rate and the measured flow rate collected in real time, the system determines the position of the current flow rate deviation within a pre-constructed multi-stage control interval, and determines the basic control level based on the opening range corresponding to the respective stage. On this basis, a corresponding proportional fine-tuning strategy is preset for different stage control intervals. This proportional fine-tuning strategy includes fine-tuning direction, fine-tuning step size, and fine-tuning sensitivity parameters, used to achieve fine-tuning correction on top of the basic opening control. Furthermore, a fine-tuning trigger condition determination mechanism is introduced. The proportional fine-tuning strategy is activated only when the flow rate deviation gradually decreases and converges to a preset fine-tuning threshold range; otherwise, the system maintains stage control mode to avoid high-frequency fine-tuning during large deviation phases, which could lead to control oscillations. When the fine-tuning condition is met, the control system switches to proportional fine-tuning mode and performs continuous or segmented proportional correction of the valve opening based on the current stage's interval and the deviation convergence trend, thereby achieving a layered control process from coarse to fine adjustment.

[0020] Furthermore, based on the cascade to which the target flow belongs in the cascade control range, a proportional fine-tuning strategy is set, including: Based on the opening response relationship of the hard-seal electric butterfly valve, a proportional fine-tuning flow threshold and a proportional fine-tuning mechanism are set; taking the target flow rate as the starting point, a reverse tracing is performed based on the proportional fine-tuning flow threshold to determine the proportional fine-tuning adjustment point; based on the proportional fine-tuning adjustment point and the proportional fine-tuning mechanism, the proportional fine-tuning strategy is generated.

[0021] Based on the nonlinear opening response relationship exhibited by the hard-seal electric butterfly valve under different opening conditions, the sensitive and insensitive ranges of flow change are analyzed to determine the proportional fine-tuning flow threshold and proportional fine-tuning mechanism that match the response characteristics. The proportional fine-tuning mechanism is used to define the continuous correction step size, correction direction, and response gain of the valve opening under different flow deviation amplitudes. Further, taking the target flow as the control starting point, a reverse mapping and tracing is performed along the flow-opening response curve. That is, starting from the expected stable opening corresponding to the target flow, the proportional fine-tuning flow threshold is used to trace back step by step to the position where the flow deviation begins to enter the high-sensitivity change range, thereby determining the proportional fine-tuning point. After obtaining the proportional fine-tuning point, this node is coupled and matched with the proportional fine-tuning mechanism to form a proportional fine-tuning strategy adapted to different deviation convergence stages. This enables the control system to perform high-precision continuous correction of the valve opening based on this strategy after entering the threshold range, thereby realizing a fine closed-loop control process triggered by the threshold.

[0022] Furthermore, based on the opening response relationship of the hard-seal electric butterfly valve, a proportional fine-tuning flow threshold and a proportional fine-tuning mechanism are set, including: Based on the flow-opening curve, the opening response relationship is analyzed to determine the sensitivity and minimum adjustment opening of different opening ranges; the control tolerance range of the hard-seal electric butterfly valve is obtained; based on the control tolerance range, the proportional fine-tuning flow threshold is set; based on the proportional fine-tuning flow threshold and the sensitivity and minimum adjustment opening of different opening ranges, the proportional fine-tuning mechanism is set.

[0023] Preferably, the flow-opening curve is discretized, and a set of opening sampling points is defined. ,in This represents the i-th aperture sample value. This represents the corresponding flow rate value. The flow rate gain coefficient per unit opening degree is calculated using adjacent sampling points as the opening degree response sensitivity. The calculation method is as follows: ,in This represents the response sensitivity within the i-th opening interval; simultaneously, it is based on the minimum controllable step distance of the actuator. Based on the actual stable operation records of the valve during historical operation, the minimum adjustment opening is corrected to obtain the effective minimum adjustment opening: ,in, This refers to the minimum oscillation-free opening change that ensures stable historical execution; furthermore, during the construction of the control tolerance range, it is based on the target flow rate. Compared with the measured flow rate Historical deviation sequence Perform statistical analysis and calculate its mean. with standard deviation And combined with the upper limit of the allowable error of the process The upper bound of the control tolerance range is obtained: , and the lower bound: Where k is the empirical safety factor, the threshold range for proportional fine-tuning flow rate is determined as follows: Based on this, the proportional fine-tuning mechanism is parameterized as the fine-tuning step size. Mapping relationship with flow deviation: ,in The proportional adjustment coefficient is introduced, and a step size constraint is also introduced. To avoid falling below the execution resolution; and also according to The time series entering the threshold range is used to determine the fine-tuning trigger node. and based on the opening degree corresponding to that node. As a baseline, a scaling strategy is constructed to enable the system to... Enter the proportional fine-tuning mode and follow the instructions. The valve opening is continuously iteratively corrected to achieve high-precision closed-loop flow control within a small deviation range.

[0024] The electric butterfly valve is adaptively controlled according to the multiple cascade control ranges and the proportional fine-tuning strategy. When the flow deviation is within the cascade control range, the cascade control mode is adopted, and when the flow deviation enters the fine-tuning threshold range, the proportional fine-tuning mode is switched.

[0025] Based on multiple tiered control intervals and corresponding proportional fine-tuning strategies, the real-time collected flow deviation is partitioned and its status is determined. These tiered control intervals are derived from the inflection points of the flow-opening curve and each corresponds to a different discrete opening target value. During control execution, when the flow deviation falls within any tiered control interval, the system determines it is currently in the coarse-tuning control phase and adopts a tiered control mode. Based on the preset opening target value corresponding to the tiered interval, the electric butterfly valve undergoes graded opening adjustment to achieve rapid convergence under large deviation conditions. When the flow deviation gradually decreases during the control process and enters the preset fine-tuning threshold range, the system triggers a control mode switching mechanism, switching the control mode from tiered control mode to proportional fine-tuning mode. At this point, discrete opening level control is no longer used; instead, the valve opening is continuously or in small steps corrected according to the proportional fine-tuning strategy. This achieves a smooth transition from coarse-grained segmented control to high-precision continuous control, improving the stability and convergence accuracy of flow control.

[0026] Furthermore, adaptive control of the electric butterfly valve based on the multiple cascade control ranges and proportional fine-tuning strategy includes: When the collected flow deviation is within the multiple tiered control intervals, the system enters the tiered control mode and controls the opening according to the target value of the tiered control interval. When the flow deviation reaches the adjustment range corresponding to the proportional fine-tuning strategy, the system enters the proportional fine-tuning mode and adjusts the opening target value according to the proportional fine-tuning strategy. The switching between the tiered control mode and the proportional fine-tuning mode is a non-linear switching triggered by the magnitude of the flow deviation.

[0027] When the flow deviation is within any tiered control range, the system determines that the current control stage is the coarse adjustment stage and enters the tiered control mode. It then performs graded opening adjustment of the electric butterfly valve according to the preset opening target value corresponding to that tiered control range to achieve rapid convergence for larger flow deviations. When the flow deviation gradually decreases and enters the adjustment range defined by the proportional fine-tuning strategy, the system determines that the control has entered the fine adjustment stage and switches to the proportional fine-tuning mode. In this mode, the opening target value is continuously or in small steps corrected based on the proportional fine-tuning strategy to improve control accuracy and stability. The switching between the tiered control mode and the proportional fine-tuning mode employs a nonlinear triggering mechanism based on the change in the amplitude of the flow deviation. That is, when the deviation crosses a preset threshold boundary, the control strategy undergoes a state transition, thereby achieving an adaptive transition from discrete tiered control to continuous fine control.

[0028] Furthermore, the adaptive control of the electric butterfly valve based on the multiple cascade control ranges and the proportional fine-tuning strategy also includes: Track the opening angle; match the opening control parameters with the opening angle, and execute subsequent opening control operations when the opening control target is met.

[0029] An angle sensor installed at the output end of the actuator collects the opening angle of the electric butterfly valve in real time, and filters and synchronizes the collected signal to obtain continuous and stable actual opening angle data. Furthermore, the opening angle is compared with the opening control parameters output in the current control cycle in real time, the deviation between the two is calculated, and it is determined whether the deviation meets the preset control convergence condition. When the deviation between the opening angle and the opening control parameters is less than or equal to the preset tolerance threshold, it is determined that the opening control target has been achieved, and the current control command has been effectively executed. After completing this target determination, the system enters the subsequent opening control operation process, providing a new control benchmark for the next stage of control or proportional fine-tuning control cycle, thereby realizing continuous closed-loop control and phased updates of the valve opening.

[0030] Furthermore, matching the opening control parameters with the opening execution angle, and then further including: When the opening angle does not meet the opening control target, the system enters the stagnation tracking window; when the opening control target is met, the system proceeds to the subsequent opening control operation; when the opening control target is continuously not met, the system feeds back the abnormal control angle; and the opening control parameter step size is adjusted and compensated according to the abnormal control angle.

[0031] Based on the real-time matching results between the opening control parameters and the actual opening execution angle, the valve execution status is determined and feedback is processed in stages. When the system detects that the deviation between the opening execution angle and the target opening parameter persists but has not yet reached the stable convergence condition, the current control process is determined to be in a transitional uncertain state and enters a stagnation tracking window. Within this window, the execution angle is continuously sampled and its trend is monitored to avoid misjudgment due to instantaneous disturbances. When the opening execution angle gradually converges and meets the preset opening control target, the control is determined to have reached a stable state, and the subsequent opening control operation process is entered to achieve normal control cycle switching. When the system detects that the opening execution angle fails to meet the opening control target for multiple control cycles and the deviation does not show a convergence trend, it is determined to be an abnormal control state, and abnormal control angle information is fed back. Based on the abnormal control angle, the step size of the current opening control parameter is adaptively adjusted and compensated, that is, the execution deviation is corrected by increasing or decreasing the control step size, thereby improving the valve's response stability and control convergence speed under complex operating conditions.

[0032] Furthermore, when the opening control target is met, subsequent opening control operations are performed, which also include: Collect the change in flow deviation; when the change in flow deviation does not reach the target value of flow adjustment, determine whether the flow deviation correction target has reached the fine-tuning control threshold range. If it has not reached the threshold range, determine the opening compensation amount; add the opening compensation amount to the subsequent opening control operation; when it reaches the threshold range, calculate the fine-tuning compensation opening and add the fine-tuning compensation opening to the subsequent opening control operation.

[0033] When the opening control target is met, the system will execute subsequent opening control operations. Specifically, the system collects the change in flow deviation within the current control cycle to characterize the trend of flow error change between adjacent control cycles and uses it as a basis for dynamic correction. When the change in flow deviation does not reach the preset opening adjustment flow target value, the system further determines the flow deviation correction target to see if the current error has entered the fine-tuning control threshold range. If it has not yet entered the fine-tuning control threshold range, the corresponding opening compensation amount is calculated based on the current deviation residual, and this opening compensation amount is superimposed on subsequent opening control commands to achieve coarse-grained continuous correction. When the system determines that the flow deviation correction target has reached the fine-tuning control threshold range, it switches to the fine correction path, calculates the fine-tuning compensation opening based on the remaining deviation amount, and superimposes the fine-tuning compensation opening as a high-precision correction amount on subsequent opening control operations, thereby achieving progressive control from coarse compensation to fine-tuning, improving the stability and convergence accuracy of valve flow control.

[0034] Furthermore, the adaptive control of the electric butterfly valve based on the multiple cascade control ranges and proportional fine-tuning strategy also includes: Establish a response correlation between valve opening control and valve wear to provide feedback on the quality impact of angle fluctuations and adjustment frequency on valve wear; configure evaluation weights for valve opening control accuracy and valve wear; optimize and adjust the multiple tiered control intervals and proportional fine-tuning strategies based on the response correlation, evaluation weights, and opening control evaluation relationship to determine an adaptive control strategy.

[0035] Valve opening angle change data is collected by the angle sensor of the actuator, and the number of adjustments and adjustment frequency per unit time are recorded by the controller. This data is then combined with historical wear detection data to form a corresponding dataset. Based on this dataset, wear evaluation indicators and opening control accuracy indicators are constructed. The wear evaluation indicator is obtained by accumulating the angle fluctuation amplitude and adjustment frequency, while the opening control accuracy indicator is obtained by accumulating the absolute value of the flow deviation within a time window. Both the wear evaluation indicator and the opening control accuracy indicator are normalized to obtain normalized results. Further, evaluation weights for valve opening control accuracy and valve wear are configured. These weights are determined proportionally based on the proportion of control error and wear in historical operating data, ensuring their sum equals 1. Then, based on the response correlation, evaluation weights, and opening control evaluation relationship, multiple tiered control intervals and proportional fine-tuning strategies are weighted and adjusted. Specifically, based on the response correlation, wear impact characteristics and control deviation impact characteristics corresponding to different opening adjustment behaviors are extracted. The system employs several control parameters, including wear impact features to characterize the relationship between angle fluctuation amplitude and adjustment frequency on the cumulative wear of the valve, and control deviation impact features to characterize the impact of flow deviation on control accuracy. Further, the wear impact features and control deviation impact features are multiplied by the evaluation weights to obtain a comprehensive impact score for each control behavior. The consistency of the control effect of each stage control interval is then checked based on the opening control evaluation relationship. Next, multiple stage control intervals are reconstructed and adjusted according to the comprehensive impact score. For stage control intervals with higher scores, the opening interval span is increased to reduce the adjustment frequency; for stage control intervals with lower scores, the opening interval span is reduced to improve control accuracy. Simultaneously, the proportional fine-tuning strategy is synchronously corrected. The proportional fine-tuning trigger threshold and fine-tuning step size are dynamically adjusted according to the scoring results. When the wear impact ratio is high, the fine-tuning trigger threshold is increased to reduce the number of high-frequency fine-tunings; when the control deviation impact ratio is high, the fine-tuning trigger threshold is decreased to enhance the fine-tuning response sensitivity. This completes the joint weighted optimization adjustment of multiple stage control intervals and the proportional fine-tuning strategy, ultimately determining the adaptive control strategy for the electric butterfly valve.

[0036] In summary, the embodiments of this application have at least the following technical effects: First, the deviation between the target flow rate and the measured flow rate is collected, and this flow deviation is used as the control target. Next, based on the flow-opening curve, the inflection point of the curve is identified. Multiple tiered control intervals are obtained based on the flow deviation and the inflection point, with each interval corresponding to a preset opening degree. Then, a proportional fine-tuning strategy is set according to the tier to which the target flow rate belongs within the tiered control interval. This strategy is activated only when the flow deviation decreases to a preset fine-tuning threshold. Finally, adaptive control of the electric butterfly valve is performed based on the multiple tiered control intervals and the proportional fine-tuning strategy. When the flow deviation is within the tiered control interval, a tiered control mode is used; when the flow deviation enters the fine-tuning threshold range, the proportional fine-tuning mode is switched to. This solves the technical problems of insufficient control accuracy and difficulty in dynamically and accurately adjusting the opening degree according to the flow deviation in existing hard-seal electric butterfly valves, resulting in slow flow regulation response. By finely adjusting the tiered adaptive adjustment based on the flow deviation, the technical effect of improving flow control accuracy and response speed is achieved.

[0037] Example 2 is based on the same inventive concept as the segmented control method of the electric butterfly valve based on flow feedback in the previous examples, such as... Figure 2 As shown, this application provides a segmented control system for an electric butterfly valve based on flow feedback, wherein the system includes: Data acquisition module 11: Collects the deviation between the target flow rate and the measured flow rate, and uses the flow deviation as the control target; Control interval division module 12: Identifies the inflection point of the flow-opening curve based on the flow rate-opening curve, and divides the control interval into multiple levels according to the flow deviation and the inflection point, each level control interval corresponding to a preset opening; Setting module 13: Sets a proportional fine-tuning strategy according to the level to which the target flow rate belongs in the control interval, wherein the proportional fine-tuning strategy is only activated when the flow deviation is reduced to within the preset fine-tuning threshold range; Control module 14: Performs adaptive control of the electric butterfly valve according to the multiple level control intervals and the proportional fine-tuning strategy, wherein when the flow deviation is within the level control interval, a level control mode is adopted, and when the flow deviation enters the fine-tuning threshold range, the proportional fine-tuning mode is switched.

[0038] Furthermore, the control interval division module 12 is used to perform the following method: Based on the inflection point of the curve, the valve opening step range is determined; the opening demand control quantity is determined according to the matching of the flow deviation and the flow-opening curve; the opening demand control quantity is projected onto the valve opening step range to obtain the matching step range; the step control range is divided according to the projection position of the matching step range to obtain the step control range.

[0039] Furthermore, the setting module 13 is used to perform the following method: Based on the opening response relationship of the hard-seal electric butterfly valve, a proportional fine-tuning flow threshold and a proportional fine-tuning mechanism are set; taking the target flow rate as the starting point, a reverse tracing is performed based on the proportional fine-tuning flow threshold to determine the proportional fine-tuning adjustment point; based on the proportional fine-tuning adjustment point and the proportional fine-tuning mechanism, the proportional fine-tuning strategy is generated.

[0040] Furthermore, the setting module 13 is used to perform the following method: Based on the flow-opening curve, the opening response relationship is analyzed to determine the sensitivity and minimum adjustment opening of different opening ranges; the control tolerance range of the hard-seal electric butterfly valve is obtained; based on the control tolerance range, the proportional fine-tuning flow threshold is set; based on the proportional fine-tuning flow threshold and the sensitivity and minimum adjustment opening of different opening ranges, the proportional fine-tuning mechanism is set.

[0041] Furthermore, the control module 14 is used to perform the following methods: When the collected flow deviation is within the multiple tiered control intervals, the system enters the tiered control mode and controls the opening according to the target value of the tiered control interval. When the flow deviation reaches the adjustment range corresponding to the proportional fine-tuning strategy, the system enters the proportional fine-tuning mode and adjusts the opening target value according to the proportional fine-tuning strategy. The switching between the tiered control mode and the proportional fine-tuning mode is a non-linear switching triggered by the magnitude of the flow deviation.

[0042] Furthermore, the control module 14 is used to perform the following methods: Track the opening angle; match the opening control parameters with the opening angle, and execute subsequent opening control operations when the opening control target is met.

[0043] Furthermore, the control module 14 is used to perform the following methods: When the opening angle does not meet the opening control target, the system enters the stagnation tracking window; when the opening control target is met, the system proceeds to the subsequent opening control operation; when the opening control target is continuously not met, the system feeds back the abnormal control angle; and the opening control parameter step size is adjusted and compensated according to the abnormal control angle.

[0044] Furthermore, the control module 14 is used to perform the following methods: Collect the change in flow deviation; when the change in flow deviation does not reach the target value of flow adjustment, determine whether the flow deviation correction target has reached the fine-tuning control threshold range. If it has not reached the threshold range, determine the opening compensation amount; add the opening compensation amount to the subsequent opening control operation; when it reaches the threshold range, calculate the fine-tuning compensation opening and add the fine-tuning compensation opening to the subsequent opening control operation.

[0045] Furthermore, the control module 14 is used to perform the following methods: Establish a response correlation between valve opening control and valve wear to provide feedback on the quality impact of angle fluctuations and adjustment frequency on valve wear; configure evaluation weights for valve opening control accuracy and valve wear; optimize and adjust the multiple tiered control intervals and proportional fine-tuning strategies based on the response correlation, evaluation weights, and opening control evaluation relationship to determine an adaptive control strategy.

[0046] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some implementations, multitasking and parallel processing are possible or may be advantageous.

[0047] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0048] This specification and accompanying drawings are merely illustrative examples of this application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Therefore, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A segmented control method for an electric butterfly valve based on flow feedback, characterized in that, The method includes: Collect the deviation between the target flow rate and the measured flow rate, and use the flow rate deviation as the control target; Based on the flow-opening curve, the inflection point of the curve is identified, and the tiered control interval is divided according to the flow deviation and the inflection point of the curve to obtain multiple tiered control intervals. Each tiered control interval corresponds to a preset opening. Based on the level to which the target flow belongs in the cascade control range, a proportional fine-tuning strategy is set, wherein the proportional fine-tuning strategy is activated only when the flow deviation is reduced to within a preset fine-tuning threshold range. The electric butterfly valve is adaptively controlled according to the multiple cascade control ranges and the proportional fine-tuning strategy. When the flow deviation is within the cascade control range, the cascade control mode is adopted, and when the flow deviation enters the fine-tuning threshold range, the proportional fine-tuning mode is switched.

2. The segmented control method for an electric butterfly valve based on flow feedback according to claim 1, characterized in that, Based on the flow deviation and the inflection point of the curve, the tiered control intervals are divided to obtain multiple tiered control intervals, including: Based on the inflection point of the curve, determine the valve opening step range; Based on the matching of the flow deviation and the flow-opening curve, the opening demand control amount is determined; The required opening value is projected onto the valve opening step range to obtain a matching step range; Based on the projection position of the matching step interval, the step control interval is divided to obtain the step control interval.

3. The segmented control method for an electric butterfly valve based on flow feedback according to claim 2, characterized in that, Based on the cascade to which the target flow belongs in the cascade control range, a proportional fine-tuning strategy is set, including: Based on the opening response relationship of the hard-seal electric butterfly valve, a proportional fine-tuning flow threshold and a proportional fine-tuning mechanism are set. Starting from the target flow rate, the proportional fine-tuning flow rate threshold is used to perform reverse tracing to determine the proportional fine-tuning point. The proportional fine-tuning strategy is generated based on the proportional fine-tuning point and the proportional fine-tuning mechanism.

4. The segmented control method for an electric butterfly valve based on flow feedback according to claim 3, characterized in that, Based on the opening response relationship of the hard-seal electric butterfly valve, a proportional fine-tuning flow threshold and a proportional fine-tuning mechanism are set, including: Based on the flow-opening curve, the opening response relationship is analyzed to determine the sensitivity and minimum adjustment opening for different opening ranges; Obtain the control tolerance range of the hard-seal electric butterfly valve, and set the proportional fine-tuning flow threshold according to the control tolerance range; The proportional fine-tuning mechanism is set based on the proportional fine-tuning flow threshold combined with the sensitivity of different opening ranges and the minimum adjustment opening.

5. The segmented control method for an electric butterfly valve based on flow feedback according to claim 1, characterized in that, Adaptive control of the electric butterfly valve is performed based on the multiple cascade control intervals and proportional fine-tuning strategy, including: When the collected flow deviation falls within the multiple cascade control intervals, the system enters the cascade control mode and controls the opening according to the target opening value of the cascade control interval. When the flow deviation reaches the adjustment range corresponding to the proportional fine-tuning strategy, the proportional fine-tuning mode is entered, and the opening target value is adjusted and controlled according to the proportional fine-tuning strategy. The switching between the tiered control mode and the proportional fine-tuning mode is a non-linear switching triggered by the magnitude of the flow deviation.

6. The segmented control method for an electric butterfly valve based on flow feedback according to claim 5, characterized in that, Adaptive control of the electric butterfly valve based on the multiple cascade control intervals and proportional fine-tuning strategy also includes: Track the opening angle; The opening control parameters are matched with the opening execution angle. When the opening control target is met, subsequent opening control operations are executed.

7. The segmented control method for an electric butterfly valve based on flow feedback according to claim 6, characterized in that, Matching the opening control parameters with the opening execution angle, and then further including: When the opening angle does not meet the opening control target, the stagnation tracking window is entered; When the opening control target is met, proceed to the subsequent opening control operation; When the opening control target is not consistently met, an abnormal control angle is fed back. The opening control parameter step size is adjusted and compensated based on the abnormal control angle.

8. The segmented control method for an electric butterfly valve based on flow feedback according to claim 7, characterized in that, When the opening control target is met, subsequent opening control operations are performed, including: Change in collected flow rate deviation; When the change in flow deviation does not reach the target value of flow adjustment, it is determined whether the flow deviation correction target has reached the fine-tuning control threshold range. If it has not reached the threshold range, the opening compensation amount is determined. The opening compensation amount is added to subsequent opening control operations; When the target is reached, the fine-tuning compensation opening is calculated and then superimposed on the fine-tuning compensation opening in subsequent opening control operations.

9. The segmented control method for an electric butterfly valve based on flow feedback according to claim 8, characterized in that, Adaptive control of the electric butterfly valve is performed based on the multiple cascade control intervals and the proportional fine-tuning strategy, and previously included as follows: Establish the response correlation between opening control and valve wear, which can be used to provide feedback on the quality impact of angle fluctuation and adjustment frequency on valve wear; Configure the evaluation weights for valve opening control accuracy and valve wear; Based on the response correlation, evaluation weights, and opening control evaluation relationship, the multiple tiered control intervals and proportional fine-tuning strategies are optimized and adjusted to determine the adaptive control strategy.

10. A segmented control system for an electric butterfly valve based on flow feedback, characterized in that, For implementing the segmented control method of an electric butterfly valve based on flow feedback as described in any one of claims 1-9, the system comprises: Data acquisition module: Collects the deviation between the target flow rate and the measured flow rate, and uses the flow rate deviation as the control target; Control interval division module: Based on the flow-opening curve, the inflection point of the curve is identified, and the control interval is divided into multiple levels according to the flow deviation and the inflection point of the curve, and each level control interval corresponds to a preset opening. Setting module: Based on the level to which the target flow belongs in the cascade control range, set a proportional fine-tuning strategy, wherein the proportional fine-tuning strategy is activated only when the flow deviation is reduced to within a preset fine-tuning threshold range; Control module: Adaptive control of electric butterfly valve is performed according to the multiple tiered control intervals and proportional fine-tuning strategy. When the flow deviation is within the tiered control interval, tiered control mode is adopted, and when the flow deviation enters the fine-tuning threshold range, it switches to proportional fine-tuning mode.

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