CN-121978518-A - Method for accurately predicting dynamic characteristics of high-speed switch valve based on frequency response characteristics

CN121978518ACN 121978518 ACN121978518 ACN 121978518ACN-121978518-A

Abstract

The invention discloses a method for accurately predicting dynamic characteristics of a high-speed switch valve based on frequency response characteristics, and belongs to the field of high-speed switch valves. The method comprises the steps of firstly obtaining a duty ratio-response characteristic curve of a high-speed switching valve in a single-voltage, three-voltage or preloaded driving mode, extracting critical duty ratio, limit highest working frequency and duty ratio-highest working frequency characteristic points in the curve, then establishing a reverse thrust equation based on mathematical correlation between duty ratio-frequency response characteristics and dynamic characteristics in different driving modes, calculating necessary opening time and necessary closing time, and finally combining voltage control characteristics of all driving modes, separating opening lag time, opening movement time, closing lag time and closing movement time, and finishing reverse thrust of the dynamic characteristics. According to the invention, the dynamic characteristics can be rapidly reversely pushed only through the duty ratio-frequency response curve without directly measuring the valve core displacement or the coil current, and the requirement of rapid detection in engineering scenes can be met.

Inventors

ZHONG QI
LI HAORAN
GUO ZIHAO
PAN LICHENG
XU ENGUANG
LI YANBIAO

Assignees

浙江工业大学

Dates

Publication Date: 20260505
Application Date: 20260123

Claims (10)

1. The method for accurately predicting the dynamic characteristic of the high-speed switch valve based on the frequency response characteristic is characterized by comprising the following steps of: 1) Determining a target driving mode of the high-speed switch valve, and obtaining different duty ratios of the high-speed switch valve through experiments according to the selected target driving mode The highest operating frequency Drawing a duty ratio-frequency response characteristic curve; 2) Extracting key characteristic parameters on a duty cycle-frequency response characteristic curve, wherein the key characteristic parameters comprise that the duty cycle is smaller than the critical duty cycle Small duty cycle characteristic point at time A duty cycle greater than the critical duty cycle Large duty cycle characteristic point at time And a critical duty cycle Corresponding maximum operating frequency of limit ; 3) Based on the association relation between the highest working frequency and the closing necessary time under the working condition of a large duty ratio, establishing a closing necessary time inversion model, and substituting the characteristic points of the large duty ratio into the model to obtain the closing necessary time; 4) And 3) establishing an opening lag time calculation model and a closing lag time calculation model of the high-speed switch valve, obtaining opening lag time and closing lag time, and combining the opening necessary time and the closing necessary time obtained in the step 3), and separating the opening lag time from the opening movement time and the closing lag time from the closing movement time to obtain the complete dynamic characteristic parameters of the high-speed switch valve.
2. The method of claim 1, wherein the target drive mode in step 1) comprises a single voltage drive mode, a three voltage drive mode, and a preload drive mode, wherein: In the single-voltage driving mode, one opening and closing period of the high-speed switch valve is divided into an opening stage and a closing stage, wherein the opening stage applies fixed high voltage to the high-speed switch valve, and the closing stage applies zero voltage to the high-speed switch valve; In the three-voltage driving mode, one opening and closing period of the high-speed switch valve is divided into a high-voltage opening stage, a low-voltage maintaining stage and a reverse high-voltage closing stage, wherein the high-voltage opening stage applies high voltage to the high-speed switch valve, the low-voltage maintaining stage applies equivalent low voltage to the high-speed switch valve to keep the high-speed switch valve open, and the reverse high-voltage closing stage applies reverse high voltage to the high-speed switch valve; In the pre-loading driving mode, one opening and closing period of the high-speed switch valve is divided into an opening pre-loading stage, a high-voltage opening stage, a low-voltage maintaining stage and a reverse high-voltage closing stage, wherein the opening pre-loading stage applies an equivalent pre-loading voltage to the high-speed switch valve to enable the coil current to rise to 5% -10% below the critical opening current in advance, and the voltages of the other stages are consistent with the three-voltage driving.
3. The method of claim 2, wherein when the target driving mode is a single voltage driving mode, the on/off necessary time inversion model in step 3) is as follows: under the working condition of small duty ratio, the necessary time is started Satisfy the following requirements Substituting small duty ratio feature point , ) Then Wherein, the method comprises the steps of, Is smaller than the critical duty cycle Is used for the control of the duty cycle of (a), Is that The corresponding highest working frequency, the critical duty ratio refers to the working point that the opening necessary time and the closing necessary time reach the minimum value at the same time; Under the working condition of large duty ratio, the necessary closing time Satisfy the following requirements Substituting the characteristic points with large duty ratio , ) Then Wherein, the method comprises the steps of, Is smaller than the critical duty cycle Is used for the control of the duty cycle of (a), Is that Corresponding highest operating frequency.
4. The method according to claim 2, wherein when the target driving mode is a three-voltage driving mode, the on-off necessary time inversion model in step 3) is as follows: under the working condition of small duty ratio, the necessary time is started Satisfy the following requirements Substituting small duty ratio feature point , ) Then ; Under the working condition of large duty ratio, the necessary closing time Satisfy the following requirements Substituting the characteristic points with large duty ratio , ) Then 。
5. The method of claim 2, wherein when the target drive mode is a preloaded drive mode, the on-off necessary time reversal model in step 3) is as follows: under the working condition of small duty ratio, the necessary time is started Satisfy the following requirements Substituting small duty ratio feature point , ) Then ; Under the working condition of large duty ratio, the necessary closing time Satisfy the following requirements Substituting the characteristic points with large duty ratio , ) Then 。
6. A method according to claim 3, wherein the lag time and movement time calculation model in step 4) is as follows when the target drive mode is a single voltage drive mode: opening lag time Wherein Is equivalent inductance in the closed state of the high-speed switch valve, In order to be an equivalent resistance, To apply a fixed high voltage to the coil during the on phase, In order to start the phase of the initial current, A critical opening current for changing the high-speed switching valve from the closed state to the open state; closing lag time Wherein Is equivalent inductance in the opening state of the high-speed switch valve, To turn off the zero voltage applied to the coil during the phase, To turn on the phase coil steady state current, A critical off current for changing the high-speed switching valve from an open state to a closed state; time of opening movement ; Closing movement time 。
7. The method of claim 4, wherein the lag time and movement time calculation model in step 4) is as follows when the target driving mode is a three-voltage driving mode: opening lag time ; Closing lag time , wherein, To turn off the reverse high voltage applied to the coil during the phase, A steady current for a low voltage maintenance phase; time of opening movement ; Closing movement time 。
8. The method of claim 5, wherein the lag time and movement time calculation model in step 4) is as follows when the target drive mode is a preloaded drive mode: opening lag time Wherein To turn on the steady current during the pre-load phase; closing lag time ; Time of opening movement ; Closing movement time 。
9. The method according to claim 1, wherein in step 2), the key characteristic parameters of the duty cycle-frequency response curve are extracted by limiting the highest operating frequency Peak frequency of duty cycle-frequency response curve, critical duty cycle Is that Corresponding duty ratio, small duty ratio characteristic point Selecting Random frequency point in 10% -20% interval, large duty ratio characteristic point Selecting Any frequency point within the interval of 70% -80%.
10. A system for accurately predicting dynamic characteristics of a high-speed switch valve based on the frequency response characteristics thereof, which is suitable for the method for accurately predicting the dynamic characteristics of the high-speed switch valve based on the frequency response characteristics of the high-speed switch valve according to any one of claims 1 to 9, and is characterized by comprising: the curve acquisition module is used for acquiring a duty ratio-frequency response characteristic curve of the high-speed switch valve in a target driving mode; a feature extraction module for extracting critical duty cycle from the duty cycle-frequency response characteristic curve Maximum limit operating frequency Characteristic point with small duty ratio And a large duty cycle feature point ; The necessary time calculation module is used for establishing an opening necessary time inversion model and a closing necessary time inversion model under a target driving mode, and calculating the opening necessary time and the closing necessary time of the high-speed switch valve by combining key characteristic parameters; And the dynamic parameter separation module is used for establishing a hysteresis time calculation model under a target driving mode, and separating the hysteresis time to obtain the opening hysteresis time, the opening motion time, the closing hysteresis time and the closing motion time of the high-speed switch valve.

Description

Method for accurately predicting dynamic characteristics of high-speed switch valve based on frequency response characteristics Technical Field The invention belongs to the field of high-speed switch valves, and particularly relates to a method for accurately predicting dynamic characteristics of a high-speed switch valve based on frequency response characteristics. Background The high-speed switch valve is used as a core element of a digital hydraulic technology, realizes high-precision control of flow and pressure through high-frequency opening and closing actions, has the advantages of high response speed, high reliability, strong pollution resistance and the like, and is widely applied to the fields of aerospace, engineering machinery, high-end manufacturing and the like. Its dynamic characteristics (including turn-on lag timeTime of opening movementClosing lag timeTime of closing movement) Directly determining the control precision and response speed of the system. The traditional dynamic characteristic detection needs to rely on special equipment such as a laser displacement sensor, a high-precision current acquisition card and the like, and obtains dynamic parameters by directly measuring valve core displacement or coil current inflection points, so that the problems of high experimental cost, complex operation, severe requirements on experimental environments and the like exist. In the prior art, a duty ratio-frequency response characteristic curve (the highest working frequency relation capable of realizing complete opening and closing under different duty ratios) of the high-speed switch valve can be obtained through a relatively simple frequency response test, and the curve and dynamic characteristics are in internal association, namely, the highest frequency under a small duty ratio is constrained by the opening dynamic characteristics, and the highest frequency under a large duty ratio is constrained by the closing dynamic characteristics. However, no method for reversely pushing dynamic characteristics from the duty cycle-frequency response curve by utilizing the correlation at present, so that the utilization rate of the duty cycle-frequency response test data is low, the dynamic characteristic detection still needs to rely on special equipment, and the requirements of low cost and quick detection in engineering application are difficult to meet. Therefore, there is a need for a method for reversely pushing dynamic characteristics based on a duty cycle-frequency response characteristic curve, which can accurately obtain dynamic parameters only through the existing duty cycle-frequency response data without complex special equipment, thereby reducing detection cost and improving engineering practicability. Disclosure of Invention The invention aims to overcome the defects that the dynamic characteristic detection in the prior art depends on special equipment and has high cost, and provides a method for reversely pushing the dynamic characteristic of a high-speed switch valve based on a duty ratio-frequency response characteristic curve. In order to achieve the above purpose, the invention adopts the following technical scheme: a method for accurately predicting dynamic characteristics of a high-speed switch valve based on frequency response characteristics of the high-speed switch valve comprises the following steps: 1) Determining a target driving mode of the high-speed switch valve, and obtaining different duty ratios of the high-speed switch valve through experiments according to the selected target driving mode The highest operating frequencyDrawing a duty ratio-frequency response characteristic curve; 2) Extracting key characteristic parameters on a duty cycle-frequency response characteristic curve, wherein the key characteristic parameters comprise that the duty cycle is smaller than the critical duty cycle Small duty cycle characteristic point at timeA duty cycle greater than the critical duty cycleLarge duty cycle characteristic point at timeAnd a critical duty cycleCorresponding maximum operating frequency of limit; 3) Based on the association relation between the highest working frequency and the closing necessary time under the working condition of a large duty ratio, establishing a closing necessary time inversion model, and substituting the characteristic points of the large duty ratio into the model to obtain the closing necessary time; 4) And 3) establishing an opening lag time calculation model and a closing lag time calculation model of the high-speed switch valve, obtaining opening lag time and closing lag time, and combining the opening necessary time and the closing necessary time obtained in the step 3), and separating the opening lag time from the opening movement time and the closing lag time from the closing movement time to obtain the complete dynamic characteristic parameters of the high-speed switch valve. Preferably, the target driving mode in step 1) includes a si