CN-121995140-A - Method for presuming duty cycle-flow characteristic based on duty cycle-frequency response characteristic of high-speed switching valve

CN121995140ACN 121995140 ACN121995140 ACN 121995140ACN-121995140-A

Abstract

The invention discloses a method for estimating duty ratio-flow characteristic based on duty ratio-frequency response characteristic of a high-speed switching valve, and belongs to the technical field of high-speed switching valves. The method comprises the steps of firstly obtaining a duty ratio-frequency response characteristic curve of a high-speed switching valve in a target driving mode, extracting upper and lower limits of corresponding controllable duty ratios in different working frequencies based on the curve, determining a linear region range of the duty ratio-flow characteristic curve according to the duty ratio range determined by the upper and lower limits, and further obtaining a linear flow prediction straight line in the frequency by fitting by detecting actual flow data at two end points in the range, so that a linear region of the complete duty ratio-flow characteristic curve can be rapidly predicted without point-by-point detection. According to the invention, only one duty ratio-frequency response characteristic curve is required to be obtained, so that the flow linear region under all working frequencies can be predicted, the duty ratio-flow characteristic detection efficiency is remarkably improved, and the problems of long detection time consumption and low precision in the traditional method are solved.

Inventors

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

Assignees

浙江工业大学

Dates

Publication Date: 20260508
Application Date: 20260123

Claims (8)

1. A method for estimating a duty cycle-flow characteristic based on a duty cycle-frequency response characteristic of a high-speed switching valve, comprising the steps of: 1) Acquiring opening lag time t don , opening movement time t mon , closing lag time t doff and closing movement time t moff of the high-speed switch valve in a selected driving mode, and accordingly obtaining a duty ratio-frequency response characteristic curve of the high-speed switch valve in the selected driving mode, wherein the duty ratio-frequency response characteristic curve represents the highest working frequency of the high-speed switch valve capable of realizing complete opening and closing under different control signal duty ratios; 2) Setting a target working frequency f of the high-speed switching valve in a selected driving mode, wherein the target working frequency f is lower than the limit highest working frequency of the high-speed switching valve in the driving mode, and determining a lower limit alpha min and an upper limit alpha max of a controllable duty ratio of the high-speed switching valve capable of normally working under the target working frequency through linear interpolation according to the duty ratio-frequency response characteristic curve obtained in the step 1), wherein a duty ratio interval determined by the lower limit alpha min and the upper limit alpha max is a flow linear interval of the duty ratio-flow characteristic curve under the target working frequency f; 3) And in the range of the flow linear region, selecting two characteristic points of a lower limit alpha min and an upper limit alpha max , detecting actual output flow values corresponding to the two characteristic points, and connecting the two characteristic points to fit to obtain the duty ratio-flow characteristic of the linear region under the target working frequency f.
2. The method according to claim 1, wherein the duty cycle-frequency response curve of step 1) is obtained by experimental detection.
3. The method of claim 1 is characterized in that the duty ratio-frequency response characteristic curve in the step 1) is generated by firstly establishing a dynamic characteristic mathematical model of electric field-magnetic field-mechanical field multi-field coupling of the high-speed switch valve, deducing quantitative association relations of opening lag time t don , opening movement time t mon , closing lag time t doff , closing movement time t moff and control signal duty ratio and working frequency of the high-speed switch valve under a selected driving mode through the dynamic characteristic mathematical model, calculating corresponding highest working frequency under different duty ratios according to the critical condition that the high-speed switch valve can be completely opened and closed, and finally fitting mapping relations of each duty ratio and the corresponding highest working frequency to generate the duty ratio-frequency response characteristic curve.
4. The method according to claim 1, wherein the lower limit α min and the upper limit α max of the controllable duty cycle in step 2) are specifically determined by determining two points with the ordinate value as the target operating frequency f on the duty cycle-frequency response characteristic curve, where the two points respectively correspond to a duty cycle, and the duty cycle is the value of the abscissa of the point, the smaller value is the lower limit α min , and the larger value is the upper limit α max .
5. The method of claim 1, wherein the driving mode of step 1) is a single voltage driving mode, a three voltage driving mode, or a preloaded multi-voltage driving mode.
6. A method according to claim 3, wherein the critical conditions under which the high-speed switching valve can achieve full opening and closing are: ; Wherein T is the period of the target operating frequency f.
7. A system for estimating a duty cycle-flow characteristic based on a duty cycle-frequency response characteristic of a high speed switching valve for implementing the method of any one of claims 1-6, comprising: the frequency response characteristic acquisition module is used for acquiring a duty ratio-frequency response characteristic curve of the high-speed switch valve in a selected driving mode; The controllable duty ratio determining module is used for determining the lower limit and the upper limit of the controllable duty ratio, which can normally work by the high-speed switch valve under the target working frequency, according to the duty ratio-frequency response characteristic curve obtained by the frequency response characteristic obtaining module; The linear region definition module is used for defining the lower limit and the upper limit of the controllable duty ratio obtained by the controllable duty ratio determination module as the lower limit and the upper limit of the duty ratio of the flow linear region of the duty ratio-flow characteristic curve; and the flow fitting module is used for fitting and generating a linear flow prediction straight line according to the actual flow detection data of the two characteristic points of the lower limit and the upper limit of the duty ratio of the control signal in the duty ratio range of the flow linear region obtained by the linear region definition module.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1-6 when the program is executed.

Description

Method for presuming duty cycle-flow characteristic based on duty cycle-frequency response characteristic of high-speed switching valve Technical Field The invention belongs to the technical field of high-speed switch valves, and particularly relates to a method for estimating the duty ratio-flow characteristic based on the duty ratio-frequency response characteristic of a high-speed switch valve. Background The high-speed switch valve is used as a core element of a digital hydraulic system, and controls the flow and the pressure with high precision 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. In hydraulic systems, the performance of the high-speed switching valve directly affects the control accuracy and dynamic response of the system. The duty cycle-frequency response characteristic and the duty cycle-flow characteristic are key indicators for measuring the performance of the high-speed switching valve. The duty cycle-frequency response characteristics describe the highest frequency at which the high-speed switching valve can operate normally at different duty cycles, while the duty cycle-flow characteristics describe the output flow of the high-speed switching valve at different duty cycles. In the prior art, the acquisition of the duty cycle-flow characteristics has been mainly based on either a direct detection method (e.g., using a flowmeter or a measuring cup) or an indirect detection method (e.g., analyzing by cylinder movement). However, these methods have limitations in that, first, the direct detection method is affected by flow fluctuation, detection accuracy is low, and time is long. For example, conventional methods require more than 40 minutes to detect a duty cycle-flow curve at a fixed frequency. Secondly, the indirect detection method requires multiple experiments to construct a complete curve, and is low in efficiency and susceptible to system parameter changes. Furthermore, although there is an inherent relationship among the dynamic characteristics, duty cycle-frequency response characteristics, and duty cycle-flow characteristics of the high-speed switching valve, the existing studies have not fully exploited the quantitative relationship therebetween, resulting in failure to achieve rapid prediction. Therefore, a method capable of rapidly estimating the duty-flow characteristic based on the duty-frequency response characteristic is urgently needed to improve the detection efficiency and accuracy. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a method for estimating the duty ratio-flow characteristic based on the duty ratio-frequency response characteristic of a high-speed switching valve. According to the method, the duty ratio-frequency response characteristic curve of the high-speed switching valve is obtained through experiments, and the linear region range of the duty ratio-flow characteristic under different working frequencies is rapidly predicted by utilizing the mapping relation between the duty ratio-frequency response characteristic curve and the duty ratio-flow characteristic, so that the detection time is obviously shortened, and the precision is ensured. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a method for estimating the duty ratio-flow characteristic based on the duty ratio-frequency response characteristic of a high-speed switching valve, which comprises the following steps: 1) Acquiring opening lag time t don, opening movement time t mon, closing lag time t doff and closing movement time t moff of the high-speed switch valve in a selected driving mode, and accordingly obtaining a duty ratio-frequency response characteristic curve of the high-speed switch valve in the selected driving mode, wherein the duty ratio-frequency response characteristic curve represents the highest working frequency of the high-speed switch valve capable of realizing complete opening and closing under different control signal duty ratios; 2) Setting a target working frequency f of the high-speed switching valve in a selected driving mode, wherein the target working frequency f is lower than the limit highest working frequency of the high-speed switching valve in the driving mode, and determining a lower limit alpha min and an upper limit alpha max of a controllable duty ratio of the high-speed switching valve capable of normally working under the target working frequency through linear interpolation according to the duty ratio-frequency response characteristic curve obtained in the step 1), wherein a duty ratio interval determined by the lower limit alpha min and the upper limit alpha max is a flow linear interval of the duty ratio-flow characteristic cu