CN-121804879-B - Intelligent testing method for high-horsepower full-power gear shifting tractor

CN121804879BCN 121804879 BCN121804879 BCN 121804879BCN-121804879-B

Abstract

The invention relates to the technical field of tractor testing, in particular to an intelligent testing method of a high-horsepower full-power gear shifting tractor, which comprises the following steps of synchronously collecting clutch oil charge pressure, output shaft torque, output shaft rotating speed and gearbox oil temperature, and constructing a synchronous data sequence with a uniform time reference; the method comprises the steps of calculating the change rate of the oil filling pressure of a clutch at any moment, performing negative exponential operation on the descending amplitude value of the torque of an output shaft to obtain an attenuation coefficient, further obtaining a power coupling index, determining a characteristic moment point and a mechanical synchronous moment point, calculating synchronous deviation of response time lag and rotating speed, obtaining a phase alignment index through logarithmic operation of product, performing weighted fusion on the power coupling index and the phase alignment index, and performing temperature correction to obtain a comprehensive grading judgment quality grade. According to the invention, the connection quality in the gear shifting process is reflected through the measurement of amplitude coordination and time sequence alignment, so that the interference of environmental factors on the test is reduced.

Inventors

MA XUQIANG
Hou Zeyi
CHEN SHAOFENG
WANG BIN
GUO MINGLI
YANG JUNFEI
MA HAO
ZHAO LU
WANG JIE

Assignees

山东华首重工有限公司

Dates

Publication Date: 20260508
Application Date: 20260310

Claims (10)

1. The intelligent testing method for the high-horsepower full-power gear shifting tractor is characterized by comprising the following steps of: synchronously acquiring clutch oil charge pressure, output shaft torque, output shaft rotating speed and gearbox oil temperature of a tractor gearbox, and constructing a synchronous data sequence with a unified time reference; Calculating the change rate of the clutch oil filling pressure according to any moment in the synchronous data sequence, obtaining the descending amplitude of the output shaft torque at the corresponding moment, performing negative exponential operation on the descending amplitude of the output shaft torque to obtain an attenuation coefficient, and obtaining the power coupling index at each moment based on the change rate of the clutch oil filling pressure and the attenuation coefficient; Determining a characteristic moment point when the clutch oil filling pressure reaches a preset engagement threshold value and a mechanical synchronization moment point when the output shaft rotation speed reaches a target rotation speed, calculating response time lag time of the characteristic moment point and the mechanical synchronization moment point, acquiring rotation speed synchronization deviation in the response time lag time, and performing logarithmic operation on the product of the response time lag time and the rotation speed synchronization deviation to obtain a phase alignment index of each moment; And carrying out weighted fusion on the power coupling index and the phase alignment index to obtain a reference score, calculating the temperature difference between the oil temperature of the gearbox and the preset optimal oil temperature, and carrying out temperature correction on the reference score according to the temperature difference to obtain a comprehensive score so as to judge the quality grade of the gear shifting process.
2. The intelligent testing method of the high-horsepower full-power shift tractor according to claim 1, wherein the power coupling index satisfies the relation: ; Wherein, the Is that A moment power coupling index; Is that The rate of change of clutch fill pressure at time indicates clutch fill pressure For time of day Is the first derivative of (a); is a coupling coefficient; Is that The decreasing amplitude of the moment output shaft torque; Is that A preset target required torque at moment; Is a preset first tiny value; Is a natural exponential function.
3. The intelligent testing method of the high horsepower full power shift tractor according to claim 1, wherein the phase alignment index satisfies the relationship: ; Wherein, the Is that A phase alignment index of time; Is that Characteristic time points of time; Is that Mechanical synchronization of time points; Is that The rotation speed of the output shaft is synchronously deviated at the moment; Is a sensitivity balance factor; Is a preset second minute value; Is a natural logarithmic function.
4. The intelligent testing method for the high-horsepower full-power shift tractor according to claim 1, wherein calculating the response time lag time of the characteristic time point and the mechanical synchronization time point, and obtaining the rotational speed synchronization deviation in the response time lag time comprises: acquiring data from a characteristic time point to a mechanical synchronous time point in a synchronous data sequence, and recording the data as a deviation calculation interval; and calculating the difference between the target rotating speed corresponding to each sampling point in the deviation calculation interval and the rotating speed of the output shaft, and extracting the maximum difference to obtain the synchronous rotating speed deviation at each moment.
5. The intelligent testing method for the high-horsepower full-power shift tractor according to claim 1, wherein the step of performing weighted fusion on the power coupling index and the phase alignment index to obtain a reference score comprises the steps of: Performing nonlinear mapping on the power coupling index by using a preset normalization factor to obtain a mapping result; The ratio of the phase alignment index to a preset maximum reference value of the phase alignment index is recorded as a phase pair Ji Bizhi; And carrying out weighted summation on the mapping result and the phase alignment ratio by using a preset weighting coefficient to obtain a reference score.
6. The high horsepower full power shift tractor intelligent test method of claim 5, wherein the nonlinear mapping is implemented by a hyperbolic tangent function.
7. The method for intelligent testing of a high horsepower full power shift tractor of claim 1, wherein the composite score satisfies the relationship: ; Wherein, the Is that Comprehensive scoring at the moment; Is that A reference score for the time of day; Is that The gearbox oil temperature at the moment; Is the optimal oil temperature; Is that The efficiency compensation coefficient at the moment is obtained by inquiring a preset efficiency mapping table; Is a preset full score; Is a natural exponential function; Is an absolute value symbol.
8. The method of claim 1, wherein determining a quality level of a shift process comprises: acquiring a preset qualification threshold and an early warning threshold, wherein the qualification threshold is larger than the early warning threshold; When the comprehensive score is continuously greater than or equal to a qualification threshold, judging the quality grade of the gear shifting process to be qualified; and when the comprehensive score is continuously smaller than the early warning threshold value, judging that the quality grade of the gear shifting process is abnormal.
9. The method of claim 1, wherein said constructing a synchronized data sequence with a uniform time reference comprises: Setting a preset sampling frequency by utilizing a unified sampling clock signal, and synchronously collecting the clutch oil filling pressure, the output shaft torque, the output shaft rotating speed and the gearbox oil temperature; and carrying out alignment association on the data of the clutch oil charge pressure, the output shaft torque and the output shaft rotating speed by taking the same time stamp as a reference, and arranging the data according to time sequence to obtain a synchronous data sequence with a unified time reference.
10. The method of claim 1, wherein said calculating a rate of change of said clutch fill pressure comprises: Determining a gear shifting activation time interval, wherein the gear shifting activation time interval is a time period from the moment of acquiring a gear shifting instruction to the moment of reaching the target rotating speed by the rotating speed of the output shaft; and calculating the first derivative of the clutch oil filling pressure at each moment in the gear shifting activation time interval to time to obtain the change rate of the clutch oil filling pressure.

Description

Intelligent testing method for high-horsepower full-power gear shifting tractor Technical Field The invention relates to the technical field of tractor testing, in particular to an intelligent testing method for a high-horsepower full-power gear shifting tractor. Background The transmission system of the high-horsepower full-power gear shifting tractor generally adopts a full-power gear shifting gearbox to cope with complex working conditions, and in order to ensure smoothness and structural reliability of the transmission system in gear shifting transient state, a set of intelligent testing method capable of accurately reflecting dynamic physical characteristics is established to play a key role in improving the operation efficiency of the whole machine. In the existing test means, a data sampling method based on discrete time is mostly adopted, and pressure and rotating speed signals are obtained by arranging sensors on a gearbox and an output shaft. In the signal processing level, noise reduction processing is generally performed on the original electric signal by using algorithms such as low-pass filtering, so as to obtain a pressure peak value or a rotation speed reduction value representing gear shifting quality, and the performance level of the gear shifting process is evaluated by matching with a preset static threshold value. However, conventional evaluation methods have limitations in dealing with the nonlinear dynamics of full power shifting, which involves millisecond energy conversion. Because the pressure building process of the execution end and the torque fluctuation of the power load end have complex physical coupling on a time axis, the existing discrete point sampling mode cannot effectively solve the dynamic matching relation between the execution strength and the load feedback at each moment. Considering that the oil charge characteristic of a hydraulic system is influenced by the change of the oil temperature of a gearbox, the fluctuation of the oil viscosity-temperature characteristic can cause uncertainty deviation of pressure response time. Because the conventional evaluation model is mostly based on static parameters, the lack of self-adaptive correction logic for oil temperature environment and system efficiency deviation leads to larger discreteness of test results obtained under different temperature working conditions. The deviation of the execution action and the power response in the phase alignment makes it difficult for the test system to accurately acquire microscopic skidding or transient energy loss caused by response time lag, and further reduces the probability of accurately evaluating the gear shifting smoothness of the transmission system. Disclosure of Invention In order to solve the technical problem that the execution and load dynamic coupling relation is lost and the response phase is difficult to evaluate accurately due to the deviation caused by the interference of environmental temperature in the full power gear shifting process, the invention provides an intelligent testing method for a high-horsepower full power gear shifting tractor, which comprises the following steps: the method comprises the steps of synchronously collecting clutch oil filling pressure, output shaft torque, output shaft rotating speed and gearbox oil temperature of a tractor gearbox, constructing a synchronous data sequence with a unified time reference, calculating the change rate of the clutch oil filling pressure according to any moment in the synchronous data sequence, obtaining the descending amplitude of the output shaft torque at the corresponding moment, carrying out negative exponential operation on the descending amplitude of the output shaft torque to obtain an attenuation coefficient, obtaining a power coupling index at each moment based on the change rate and the attenuation coefficient of the clutch oil filling pressure, determining a characteristic moment point when the clutch oil filling pressure reaches a preset joint threshold value and a mechanical synchronous moment point when the output shaft rotating speed reaches a target rotating speed, calculating response time lag time of the characteristic moment point and the mechanical synchronous moment point, obtaining rotating speed synchronous deviation in the response time lag time, carrying out logarithmic operation on the product of the response time lag time and the rotating speed synchronous deviation, obtaining a reference value by weighting and fusing the power coupling index and the phase alignment index, calculating a temperature difference value of the gearbox oil temperature and the preset optimal oil temperature, and carrying out a comprehensive grade judgment process according to the temperature difference value of the reference grade. According to the invention, key physical quantities such as clutch oil charge pressure and output shaft torque are synchronously collected to establish a data sequence with a u