CN111473020A - Method for evaluating flutter current parameters of electromagnetic valve of gearbox hydraulic system - Google Patents
Method for evaluating flutter current parameters of electromagnetic valve of gearbox hydraulic system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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Abstract
The invention provides a method for evaluating flutter current parameters of a solenoid valve of a gearbox hydraulic system, which comprises the steps of adjusting the oil temperature of the hydraulic system and the oil pressure of a main oil way, superposing flutter currents with determined frequency and determined amplitude on the basis of target control current and inputting the superposed flutter currents into the solenoid valve, measuring the response oil pressure of the output end of the solenoid valve under the combination of the flutter current parameters, and processing the response oil pressure data to obtain the delay time, the overshoot, the hysteresis loop width and the hysteresis loop standard error under the combination of the flutter current parameters; changing the flutter current parameter combination, repeating the steps to obtain four indexes under different flutter current parameter combinations, respectively carrying out normalization processing on the four indexes, summing up the four index normalization values under the same flutter current parameter combination to obtain a comprehensive evaluation value under the flutter current parameter combination, and taking the flutter current parameter combination corresponding to the minimum value in all the comprehensive evaluation values as the optimal flutter current parameter combination under the set temperature. The method is efficient and reliable, and comprehensive and objective in evaluation.
Description
Technical Field
The invention relates to a method for evaluating flutter current parameters of an electromagnetic valve of a gearbox hydraulic system.
Background
The hydraulic system of the gearbox uses an electromagnetic valve to control oil pressure so as to adjust the clutch friction plate pressing force to complete gear shifting, and in order to ensure the gear shifting quality, the oil pressure response of the electromagnetic valve is required to be fast, accurate and stable. Because the valve core is subjected to friction force during movement and hysteresis exists in the magnet material, the electromagnetic valve has the defects of hysteresis and the like in the control process. Superimposing a dither current of a suitable frequency and suitable amplitude on the basis of the target control current can significantly improve the control characteristics of the solenoid valve. The selection of the proper combination of the flutter current parameters is a necessary condition for the formulation and optimization of the hydraulic system control strategy. At present, the flutter current parameter evaluation of the electromagnetic valve in the industry is mainly carried out in a manual screening mode. Specifically, two response oil pressure curves of different flutter current parameter combinations are compared, the better one of the two response oil pressure curves is visually evaluated, the corresponding flutter current parameter combination is selected for next comparison, and the comparison is repeated until the flutter solenoid valve parameter corresponding to the best performance in the response oil pressure curves is found; among comparison processes of different rounds, evaluation dimensions are often different, and may be one or more of evaluation dimensions such as response time, overshoot, hysteresis size and the like. The traditional method for manually screening the parameter combination of the electromagnetic valve has various defects, mainly comprising low screening efficiency, non-uniform evaluation indexes, subjective deviation introduced by manual evaluation, low accuracy of evaluation results and the like.
Disclosure of Invention
The invention aims to provide the method for evaluating the flutter current parameters of the electromagnetic valve of the hydraulic system of the gearbox, which is efficient and reliable, uniform in evaluation index, and high in test efficiency and evaluation result accuracy.
The invention is realized by the following scheme:
a method for evaluating flutter current parameters of an electromagnetic valve of a gearbox hydraulic system comprises the following steps:
s1, adjusting the oil temperature of the hydraulic system of the gearbox to a set temperature and keeping the temperature constant, then adjusting the oil pressure of a main oil path of the hydraulic system of the gearbox to a set oil pressure and keeping the oil pressure stable, and then executing the step S2;
s2 superimposing flutter current with determined frequency and determined amplitude on the basis of target control current, inputting the current to the solenoid valve, and measuring the response oil pressure of the output end of the solenoid valve under the flutter current parameter combination, wherein the target control current curve is formed by continuously mixing a plurality of straight line segments, a plurality of ascending inclined line segments and a plurality of descending inclined line segments, the target control current curve comprises at least one trapezoidal wave part and at least one triangular wave part, and the line segments in front of the trapezoidal wave part and the triangular wave part are respectively a straight line segment; the flutter current is triangular wave, and the parameters of the flutter current consist of frequency and amplitude;
s3, processing the response oil pressure data of the output end of the solenoid valve obtained in the step S2 to obtain four indexes of delay time, overshoot, hysteresis width and hysteresis standard error under the flutter current parameter combination;
s4, changing flutter current parameter combination, obtaining four indexes of delay time, overshoot, hysteresis width and hysteresis standard error under different flutter current parameter combinations according to steps S2-S3, and respectively carrying out normalization processing on the same index data under different flutter current parameter combinations according to a formula (1) to obtain four index normalization values corresponding to different flutter current parameter combinations;
s5, summing the four index normalization values under the same flutter current parameter combination obtained in the step S4 to obtain a comprehensive evaluation value under the flutter current parameter combination, wherein the flutter current parameter combination corresponding to the minimum value in the comprehensive evaluation values of all the flutter current parameter combinations is used as the optimal flutter current parameter combination under the set temperature;
s6 changing the set temperature, and obtaining the optimal flutter current parameter combination under different set temperatures according to the steps S1-S5. Further, in step S3, the method for acquiring the delay time includes: fitting the electromagnetic valve output end response oil pressure data corresponding to a straight line section before the trapezoidal wave part starting point in the target control current curve into a horizontal straight line, fitting the electromagnetic valve output end response oil pressure data corresponding to the trapezoidal wave part starting point to the top part starting point in the target control current curve into an oblique line, taking the intersection point of the horizontal straight line and the oblique line as a response oil pressure inflection point, and taking the difference value between the time corresponding to the response oil pressure inflection point and the time corresponding to the trapezoidal wave part starting point in the target control current curve as delay time;
the overshoot is calculated according to the formula (2) to obtain:
the method for acquiring the hysteresis width and the hysteresis standard error comprises the following steps: selecting data of a triangular wave part in a target control current curve and corresponding electromagnetic valve output end response oil pressure data, drawing a hysteresis curve by taking target control current corresponding to the same time as abscissa and response oil pressure as ordinate, dividing the hysteresis curve into a plurality of stages according to equal target current width, wherein each stage comprises a forward stroke and a reverse stroke, respectively fitting the response oil pressure of the forward stroke and the reverse stroke of each stage into oil pressure straight lines, calculating the average oil pressure difference value of the two fitted oil pressure straight lines in the stage under the target control current, averaging the average oil pressure difference values of all the stages to be used as hysteresis width, calculating the standard error corresponding to the fitted oil pressure straight lines, and averaging the standard errors of all the strokes to be used as hysteresis standard error.
Further, the set temperature is a value in the range of-30 ℃ to 100 ℃.
Further, the frequency of the flutter current is 20-250 Hz, and the amplitude is 0-400 mA.
The method for evaluating the flutter current parameters of the electromagnetic valve of the hydraulic system of the gearbox is efficient and reliable. Firstly, the dynamic response characteristic of the control process and the hysteresis response characteristic are considered by adopting four evaluation indexes, and the control effect of the flutter current of different parameter combinations is specifically and comprehensively measured. Secondly, the four evaluation indexes are converted into a comprehensive evaluation value after being normalized, the method is simple and feasible, and the difficulty caused by different dimensions and different magnitude levels among the indexes is overcome. And thirdly, the subjective deviation caused by manual visual evaluation is avoided by using a data quantification method, the provided index calculation method is detailed and can automatically process the test data by obtaining a data processing script through programming, the optimal flutter current parameter combination is automatically screened out, and the test efficiency and the evaluation result accuracy are obviously improved.
Drawings
FIG. 1 is a diagram showing a target control current curve in example 1;
FIG. 2 is a schematic view showing a response oil pressure inflection point determined by fitting a horizontal straight line and a diagonal line in the method for obtaining a delay time in example 1;
fig. 3 is a schematic diagram of a hysteresis curve in embodiment 1.
Detailed Description
The invention is further illustrated by the following figures and examples, but the invention is not limited to the examples.
Example 1
A method for evaluating flutter current parameters of an electromagnetic valve of a gearbox hydraulic system comprises the following steps:
s1, adjusting the oil temperature of the hydraulic system of the gearbox to a set temperature and keeping the temperature constant, then adjusting the oil pressure of a main oil path of the hydraulic system of the gearbox to a set oil pressure and keeping the oil pressure stable, and then executing the step S2;
s2 superimposing flutter currents with determined frequencies and determined amplitudes on the basis of a target control current, inputting the superimposed flutter currents to a solenoid valve, and measuring a response oil pressure at an output end of the solenoid valve under the combination of flutter current parameters, wherein a target control current curve is formed by continuously mixing a plurality of straight line segments, a plurality of ascending ramp line segments, and a plurality of descending ramp line segments, the target control current curve in this embodiment 1 includes a trapezoidal wave portion and a triangular wave portion, and line segments before the trapezoidal wave portion and the triangular wave portion are respectively a straight line segment, and the target control current curve is as shown in fig. 1; the flutter current is a triangular wave, the parameters of the flutter current consist of frequency and amplitude, the frequency of the flutter current is taken as a value in the range of 20-250 Hz, and the amplitude is taken as a value in the range of 0-400 mA;
s3, processing the response oil pressure data of the output end of the solenoid valve obtained in the step S2 to obtain four indexes of delay time, overshoot, hysteresis width and hysteresis standard error under the flutter current parameter combination;
as shown in fig. 2, fitting the response oil pressure data (□ in the figure) of the output end of the solenoid valve corresponding to the straight line section before the start point of the trapezoidal wave part in the target control current curve to a horizontal straight line, fitting the second half (○ in the figure) of the response oil pressure data of the output end of the solenoid valve corresponding to the start point of the trapezoidal wave part to the top part in the target control current curve to form an oblique line, taking the intersection point of the horizontal straight line and the oblique line as a response oil pressure inflection point, and taking the difference between the time corresponding to the response oil pressure inflection point and the time corresponding to the start point of the trapezoidal wave part in the target control current curve as delay time;
the overshoot is calculated according to the formula (2) to obtain:
the method for acquiring the hysteresis width and the hysteresis standard error comprises the following steps: selecting the data of the triangular wave part in the target control current curve and the corresponding electromagnetic valve output end response oil pressure data, the target control current corresponding to the same time is used as the abscissa and the response oil pressure is used as the ordinate, a hysteresis curve is obtained by drawing, as shown in fig. 3, the hysteresis curve is divided into a plurality of stages according to the equal target current width, in this embodiment 1, the hysteresis curve is divided into 5 stages according to the equal target current width, each stage includes a forward stroke and a reverse stroke, the response oil pressure of the forward stroke and the reverse stroke of each stage is respectively fitted into an oil pressure straight line, and the average oil pressure difference value of the two fitted oil pressure straight lines in each stage under the target control current in the stage is calculated, taking an average value of the average oil pressure difference values of all stages as a hysteresis width, calculating a standard error corresponding to the fitting oil pressure straight line, and taking an average value of the standard errors of all strokes of all stages as a hysteresis standard error;
s4, changing flutter current parameter combination, obtaining four indexes of delay time, overshoot, hysteresis width and hysteresis standard error under different flutter current parameter combinations according to steps S2-S3, and respectively carrying out normalization processing on the same index data under different flutter current parameter combinations according to a formula (1) to obtain four index normalization values corresponding to different flutter current parameter combinations;
s5, summing the four index normalization values under the same flutter current parameter combination obtained in the step S4 to obtain a comprehensive evaluation value under the flutter current parameter combination, wherein the flutter current parameter combination corresponding to the minimum value in the comprehensive evaluation values of all the flutter current parameter combinations is used as the optimal flutter current parameter combination under the set temperature;
s6, changing the set temperature, taking the value of the set temperature in-30-100 ℃, and obtaining the optimal flutter current parameter combination at different set temperatures according to the steps S1-S5.
The following is a specific example:
the temperature is set to be 20 ℃, the oil pressure of a main oil line is set to be 15bar, the frequency of the flutter current is selected to be 62.5Hz, 83.33Hz, 125Hz and 250Hz, the amplitude is selected to be 50mA, 100mA, 150mA, 200mA, 250mA and 300mA, the frequency and the amplitude are randomly combined into a plurality of groups of flutter current parameter combinations, the delay time, the overshoot amount, the hysteresis loop width and the hysteresis loop standard error corresponding to each flutter current parameter combination are respectively obtained according to the method of the embodiment 1, the delay time corresponding to each flutter current parameter combination is shown in the table 1, the overshoot amount corresponding to each flutter current parameter combination is shown in the table 2, the hysteresis loop width corresponding to each flutter current parameter combination is shown in the table 3, and the hysteresis loop standard error corresponding to each flutter current parameter combination is shown in the table 4. The data shown in tables 1 to 4 are rounded data.
TABLE 1 delay times for each combinations of flutter current parameters
TABLE 2 overshoot for each flutter current parameter combination
TABLE 3 hysteresis loop width corresponding to each flutter current parameter combination
TABLE 4 hysteresis standard error corresponding to each flutter current parameter combination
The delay time, overshoot, hysteresis width and hysteresis standard error normalization values corresponding to each flutter current parameter combination are obtained by calculation according to the formula (1), the delay time normalization value corresponding to each flutter current parameter combination is shown in table 5, the overshoot normalization value corresponding to each flutter current parameter combination is shown in table 6, the hysteresis width normalization value corresponding to each flutter current parameter combination is shown in table 7, and the hysteresis standard error normalization value corresponding to each flutter current parameter combination is shown in table 8. The data shown in tables 5 to 8 are rounded data.
TABLE 5 delay time normalization values corresponding to each flutter current parameter combination
TABLE 6 overshoot normalization value corresponding to each flutter current parameter combination
TABLE 7 hysteresis width normalization value corresponding to each flutter current parameter combination
TABLE 8 normalized value of standard error of hysteresis loop corresponding to each flutter current parameter combination
And summing the four index normalization values under the same flutter current parameter combination to obtain a comprehensive evaluation value under the flutter current parameter combination, wherein the comprehensive evaluation value data under all the flutter current parameter combinations are shown in a table 9, and the data in the table 9 is rounded data.
TABLE 9 comprehensive evaluation values of combinations of parameters of each flutter current
As can be seen from the data in table 9, the minimum value of the comprehensive evaluation values of all combinations of the flutter current parameters is 0.566, the frequency of the corresponding flutter current is 125Hz, the amplitude is 200mA, that is, the optimum combination of the flutter current parameters at the set temperature of 20 ℃ is: the frequency is 125Hz, and the amplitude is 200 mA.
Claims (4)
1. A method for evaluating flutter current parameters of an electromagnetic valve of a gearbox hydraulic system is characterized by comprising the following steps: the method comprises the following steps:
s1, adjusting the oil temperature of the hydraulic system of the gearbox to a set temperature and keeping the temperature constant, then adjusting the oil pressure of a main oil path of the hydraulic system of the gearbox to a set oil pressure and keeping the oil pressure stable, and then executing the step S2;
s2 superimposing flutter current with determined frequency and determined amplitude on the basis of target control current, inputting the current to the solenoid valve, and measuring the response oil pressure of the output end of the solenoid valve under the flutter current parameter combination, wherein the target control current curve is formed by continuously mixing a plurality of straight line segments, a plurality of ascending inclined line segments and a plurality of descending inclined line segments, the target control current curve comprises at least one trapezoidal wave part and at least one triangular wave part, and the line segments in front of the trapezoidal wave part and the triangular wave part are respectively a straight line segment; the flutter current is triangular wave, and the parameters of the flutter current consist of frequency and amplitude;
s3, processing the response oil pressure data of the output end of the solenoid valve obtained in the step S2 to obtain four indexes of delay time, overshoot, hysteresis width and hysteresis standard error under the flutter current parameter combination;
s4, changing flutter current parameter combination, obtaining four indexes of delay time, overshoot, hysteresis width and hysteresis standard error under different flutter current parameter combinations according to steps S2-S3, and respectively carrying out normalization processing on the same index data under different flutter current parameter combinations according to a formula (1) to obtain four index normalization values corresponding to different flutter current parameter combinations;
and S5, summing the four index normalized values under the same flutter current parameter combination obtained in the step S4 to obtain a comprehensive evaluation value under the flutter current parameter combination, wherein the flutter current parameter combination corresponding to the minimum value in the comprehensive evaluation values of all the flutter current parameter combinations is used as the optimal flutter current parameter combination under the set temperature.
S6 changing the set temperature, and obtaining the optimal flutter current parameter combination under different set temperatures according to the steps S1-S5. The method for evaluating the flutter current parameter of the electromagnetic valve of the hydraulic system of the gearbox according to claim 1, wherein the method comprises the following steps: in step S3, the method for acquiring the delay time includes: fitting the electromagnetic valve output end response oil pressure data corresponding to a straight line section before the trapezoidal wave part starting point in the target control current curve into a horizontal straight line, fitting the electromagnetic valve output end response oil pressure data corresponding to the trapezoidal wave part starting point to the top part starting point in the target control current curve into an oblique line, taking the intersection point of the horizontal straight line and the oblique line as a response oil pressure inflection point, and taking the difference value between the time corresponding to the response oil pressure inflection point and the time corresponding to the trapezoidal wave part starting point in the target control current curve as delay time;
the overshoot is calculated according to the formula (2) to obtain:
the method for acquiring the hysteresis width and the hysteresis standard error comprises the following steps: selecting data of a triangular wave part in a target control current curve and corresponding electromagnetic valve output end response oil pressure data, drawing a hysteresis curve by taking target control current corresponding to the same time as abscissa and response oil pressure as ordinate, dividing the hysteresis curve into a plurality of stages according to equal target current width, wherein each stage comprises a forward stroke and a reverse stroke, respectively fitting the response oil pressure of the forward stroke and the reverse stroke of each stage into oil pressure straight lines, calculating the average oil pressure difference value of the two fitted oil pressure straight lines in the stage under the target control current, averaging the average oil pressure difference values of all the stages to be used as hysteresis width, calculating the standard error corresponding to the fitted oil pressure straight lines, and averaging the standard errors of all the strokes to be used as hysteresis standard error.
3. The method for evaluating the flutter current parameter of the electromagnetic valve of the hydraulic system of the gearbox according to claim 1 or 2, wherein the method comprises the following steps: the set temperature is a value in the range of-30 to 100 ℃.
4. The method for evaluating the flutter current parameters of the electromagnetic valve of the hydraulic system of the gearbox according to any one of claims 1 to 3, wherein the method comprises the following steps: the frequency of the flutter current is 20-250 Hz, and the amplitude is 0-400 mA.
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| CN112763791A (en) * | 2020-12-23 | 2021-05-07 | 潍柴动力股份有限公司 | Current detection method and device for series electromagnetic valve |
| CN112803926A (en) * | 2021-01-19 | 2021-05-14 | 北谷电子有限公司 | Driving method of proportional electromagnetic valve |
| CN113791299A (en) * | 2021-10-25 | 2021-12-14 | 北京航空航天大学宁波创新研究院 | Electromagnetic valve flutter parameter testing method and system |
| CN114384795A (en) * | 2021-12-21 | 2022-04-22 | 卓品智能科技无锡有限公司 | Proportional solenoid valve current vibration control method |
| CN114909509A (en) * | 2022-03-30 | 2022-08-16 | 中国第一汽车股份有限公司 | Method and system for calibrating current precision of electronic control shock absorber |
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| CN114909509A (en) * | 2022-03-30 | 2022-08-16 | 中国第一汽车股份有限公司 | Method and system for calibrating current precision of electronic control shock absorber |
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Effective date of registration: 20220822 Address after: No.16 Gongxin Avenue, industrial park, Yifeng County, Yichun City, Jiangxi Province Patentee after: Jiangxi Dingsheng New Material Technology Co.,Ltd. Address before: 528000 No.1, ChanGang North Road, Nanzhuang Town, Chancheng District, Foshan City, Guangdong Province Patentee before: CORUN HYBRID POWER TECHNOLOGY Co.,Ltd. |