CN114740216B - Longitudinal water-drift test method for car tire - Google Patents
Longitudinal water-drift test method for car tire Download PDFInfo
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- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 278
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000004061 bleaching Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 10
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- 238000009825 accumulation Methods 0.000 claims description 6
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- 206010039203 Road traffic accident Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
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Abstract
The invention provides a car tire longitudinal water drift test method, which comprises the following steps: s1, performing a water bleaching test, which comprises the following steps: s11, initial water drift test of a reference tire: the method comprises the steps that a reference tire is mounted on a test vehicle to carry out a water drift test, and at least six groups of effective test data are collected to form a test set; s12, carrying out a water bleaching test of the test tire: replacing the reference tire with a test tire for a water drift test, and collecting at least six groups of effective test data as a test set; s13, after the first group S12 is tested, repeating the two groups of tests at most; s14, carrying out a final water drift test of the reference tire: replacing the test tire with the reference tire in the step S1 for a water drift test, and collecting at least six groups of effective test data as a test set; s2, calculating a water drift critical test vehicle speed average value; s3, calculating a weighted water drift critical test vehicle speed average value of the reference tire corresponding to the test tire: s4, calculating a water drift performance index AI, and reflecting the water drift performance of the tire.
Description
Technical Field
The invention belongs to the technical field of vehicle testing, and particularly relates to a longitudinal water drift test method for a car tire.
Background
The tires are the only components of the whole vehicle which are in contact with the road surface, and the acceleration, braking and steering control of the vehicle is derived from the friction between the tires and the road surface. In recent years, along with the safety awareness of drivers, road construction levels and vehicle safety driving auxiliary systems are continuously updated, and the number of people dying of ten thousand vehicles in China road traffic accidents is in a gradually decreasing state. However, in rainy seasons each year, the phenomenon that the vehicle tire cannot obtain enough adhesive force or the vehicle is out of control due to water drift occurs, so that huge hidden danger is caused to life and property safety.
Based on the background, a host factory often requires a tire enterprise to provide a tire wet distance or a wet grip performance index parameter when being matched, and in addition, in the aspect of tire water drift performance test research, researchers of universities and enterprises also develop a great deal of research, but the research work is mostly based on theory and simulation analysis, the road test research is less, and the water drift performance of the tire is difficult to accurately reflect. The vehicle water drift performance evaluation widely applied mainly starts from the perspective of subjective evaluation, when the tire is water-floated, a vehicle driver can feel the feeling of the surface of the suspended water accumulation of the tire of the vehicle, at the moment, the steering response of the vehicle is not or is very weak when the steering wheel is operated, and the critical test speed of the tire with different pattern types for water drift is consistent with the subjective feeling of a human body. However, subjective perception of the human body is greatly affected by experience differences of individuals, and the credibility is not high.
Disclosure of Invention
The invention aims to provide a car tire longitudinal water drift test method, which can objectively and accurately know the longitudinal water drift performance index of a tire and embody the water drift performance of the tire.
The invention provides the following technical scheme:
A car tire longitudinal water drift test method comprises the following steps:
s1, carrying out a water drift test, namely accelerating a vehicle to run for a set distance after the vehicle enters a water accumulation road surface by using a full accelerator, wherein the slip rate s of the vehicle in a test area is not less than 10% in the acceleration process, and the slip rate is not less than Wherein v is the test vehicle speed, and r is the wheel speed;
The method specifically comprises the following steps:
s11, initial water drift test of a reference tire: the method comprises the steps that a reference tire is mounted on a test vehicle to carry out a water drift test, and at least six groups of effective test data are collected to form a test set, wherein the test set is represented by R i;
S12, carrying out a water bleaching test of the test tire: replacing a reference tire with a test tire for a water drift test, and collecting at least six groups of effective test data as a test set, wherein the test set is denoted by T n;
s13, after the first group of T 1 is tested, repeating two groups of T n tests at most;
s14, carrying out a final water drift test of the reference tire: replacing the test tire with the reference tire in the step S1 for a water drift test, and collecting at least six groups of effective test data as a test set, wherein the test set is represented by R f; thereby completing a test cycle;
S2, calculating a water drift critical test vehicle speed average value:
In the method, in the process of the invention, The average value of the speed of the water drift critical test of the ith group of test sets of the test tires is expressed in meters per second;
v aqua,ji: testing the speed of a water drift critical test of a jth test in a test set of a ith group of water drift tests of the tire, wherein the unit is meter per second;
n: testing the number of effective tests of the tire in its corresponding test cycle;
S3, calculating a weighted water drift critical test vehicle speed average value of a reference tire corresponding to the test tire according to the table 1:
TABLE 1
In the table of the present invention,The average value of the weighted water drift critical test vehicle speed of the reference tire; /(I)Is the average value of the water drift critical test vehicle speed of the reference tire in the step S11,/>Is the average value of the speed of the critical test of the water drift of the reference tire in the step S14,/>The average value of the water drift critical test vehicle speed of the test tires in the steps S12 and S13;
s4, calculating a water drift performance index AI, wherein the water drift performance index represents the relative percentage of the gripping performance of the test tire and the reference tire on the wet road surface:
preferably, the step S2 further includes a test result checking step:
Coefficient of variation of the measured water-drift critical test vehicle speed of the test tire The group should be retested, coefficient of variation/>Calculated as follows:
wherein: To test tire I standard deviation.
Preferably, the test cycle sequence for (a) three sets of test tires is as follows: ri-T1-T2-T3-Rf; (b) The test of the five test tires included two cycles, the cycle sequence being as follows: ri-T1-T2-T3-Rf/Ri-T4-T5-Rf.
Preferably, step S1 is preceded by mounting a vehicle speed meter on the vehicle, mounting a wheel speed sensor on the vehicle drive wheel, and then calibrating the wheel speed sensor.
Preferably, the test vehicle is accelerated to an initial speed of 50km/h on a starting road section, and after entering a water accumulation road surface, the first 30m of the road is used for stabilizing the test vehicle speed, and the subsequent 50m area is subjected to full throttle acceleration.
Preferably, observing whether the slip rate s between the vehicles in the test area reaches 10% or not in the acceleration process, if the slip rate s reaches 10%, repeating the test, and at least completing six effective tests; if the slip rate s still does not reach 10% in the repeated test, the initial speed of the vehicle entering the test area is continuously increased until the slip rate s reaches 10% in the test area.
Preferably, in order to reduce test errors, the recognition systems are respectively arranged on a test road section and a test vehicle, and once the test vehicle enters a test area, the full throttle is accelerated and controlled to test in the same area of the road surface of the test area; the test is performed in high gear.
Preferably, each water drift test is performed in the same direction within the same test cycle; when a plurality of test cycles are continuously performed, the final water float test of the reference tire in the previous test cycle is used as the initial water float test of the reference tire in the next test cycle.
The beneficial effects of the invention are as follows:
The invention provides a tire longitudinal water drift critical test vehicle speed judging condition, which is characterized in that the vehicle speed corresponding to the slip rate of 10% among the vehicle tires is taken as the tire longitudinal water drift critical test vehicle speed. And (3) under the judging condition, the test circulation in the step (S1) is carried out by using the reference tire and the test tire, data are collected, and the test data are processed and analyzed to obtain the water drift performance index of the test tire, so that the water drift performance index of the test tire is convenient for researchers to compare the drainage performance of the test tire.
Detailed Description
Example 1
The invention provides a car tire longitudinal water drift test method, which comprises the following steps:
S1, carrying out a water bleaching test, wherein the test conditions and the method are as follows: mounting a speedometer on a vehicle, mounting a wheel speed sensor on a driving wheel of the vehicle, and then calibrating the wheel speed sensor; accelerating the test vehicle to an initial speed of 50km/h at a starting section, and after entering a ponding road surface, stabilizing the test vehicle speed by the first 30m of the road, and accelerating the test vehicle in a subsequent 50m area by using a full accelerator; observing whether the slip rate s between the tire vehicles in the test area reaches 10% or not in the acceleration process, if the slip rate s reaches 10%, repeating the test, and at least completing six effective tests; if the slip rate s still does not reach 10% in the repeated test, the initial speed of the vehicle entering the test area is continuously increased until the slip rate s reaches 10% in the test area. Wherein slip ratio Wherein v is the test vehicle speed, and r is the wheel speed;
the specific test cycle process comprises the following steps:
s11, initial water drift test of a reference tire: the method comprises the steps that a reference tire is mounted on a test vehicle to carry out a water drift test, and at least six groups of effective test data are collected to form a test set, wherein the test set is represented by R i;
S12, carrying out a water bleaching test of the test tire: replacing a reference tire with a test tire for a water drift test, and collecting at least six groups of effective test data as a test set, wherein the test set is denoted by T n;
s13, after the first group of T 1 is tested, repeating two groups of T n tests at most;
s14, carrying out a final water drift test of the reference tire: replacing the test tire with the reference tire in the step S1 for a water drift test, and collecting at least six groups of effective test data as a test set, wherein the test set is represented by R f; thereby completing a test cycle;
for example, the test cycle may be performed in the following manner:
(a) The test cycle sequence for the three groups of test tires is as follows: ri-T1-T2-T3-Rf;
(b) The test of the five test tires included two cycles, the cycle sequence being as follows: ri-T1-T2-T3-Rf/Ri-T4-T5-Rf.
S2, after data acquisition, calculating a water drift critical test vehicle speed average value:
In the method, in the process of the invention, The average value of the speed of the water drift critical test of the ith group of test sets of the test tires is expressed in meters per second;
v aqua,ji: testing the speed of a water drift critical test of a jth test in a test set of a ith group of water drift tests of the tire, wherein the unit is meter per second;
n: the tires were tested for the number of effective tests in their corresponding test cycles.
Coefficient of variation of the measured water-drift critical test vehicle speed of the test tireThe data is discarded and the group should be retested, coefficient of variation/>Calculated as follows:
wherein: To test tire i standard deviation.
S3, calculating a weighted water drift critical test vehicle speed average value of the reference tire corresponding to the test tire according to the table 1 to obtain a water drift critical test average vehicle speed correction value of the reference tire:
TABLE 1
In the table of the present invention,The average value of the weighted water drift critical test vehicle speed of the reference tire; /(I)Is the average value of the water drift critical test vehicle speed of the reference tire in the step S11,/>Is the average value of the speed of the critical test of the water drift of the reference tire in the step S14,/>The average value of the water drift critical test vehicle speed of the test tires in the steps S12 and S13; /(I)Representing the average value of the water-drift critical test vehicle speed of the reference tire corresponding to the test tire, taking into consideration that the environmental parameters (water film thickness, wind speed, environmental temperature and the like) in different test tire test projects are always in the dynamic change process, calculating/>The test data of the reference tire under the test working condition of the test tire can be obtained through conversion, and the influence of environmental parameter change on the test result can be reduced to the greatest extent when the final drift performance index AI is calculated.
S4, calculating a water drift performance index AI, wherein the water drift performance index represents the relative percentage of the gripping performance of the test tire and the reference tire on the wet road surface so as to reflect the water drift performance of the test tire, and the larger the AI value is, the better the water drift performance index is, and the calculation formula is as follows:
In order to reduce test errors, the test road section and the test vehicle are respectively provided with an identification system, and once the test vehicle enters a test area, the full accelerator is accelerated and controlled to test in the same area of the road surface of the test area; the test is performed in high gear.
Each time a water drift test is performed in the same direction within the same test cycle; when multiple test cycles are performed in succession, the final water float test of the reference tire in the last test cycle may be used as the initial water float test of the reference tire in the next test cycle.
The existing vehicle water drift performance evaluation mainly starts from the subjective evaluation, and when the tire is water-floated, a vehicle driver perceives the feeling of the surface of the suspended water accumulation of the vehicle tire. The test method quantifies the water drift performance index of the tire water drift, processes and analyzes the data, reduces the influence of environmental parameter changes on test results, and more objectively and accurately evaluates the water drift performance of the tire.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The car tire longitudinal water drift test method is characterized by comprising the following steps of:
S1, carrying out a water drift test, namely accelerating a vehicle to run for a set distance after the vehicle enters a water accumulation road surface by using a full accelerator, wherein the slip rate s of the vehicle in a test area is not less than 10% in the acceleration process, and the slip rate is not less than Wherein v is the test vehicle speed, and r is the wheel speed;
The water bleaching test specifically comprises the following steps:
S11, performing initial water drift test of a reference tire: the method comprises the steps that a reference tire is mounted on a test vehicle to carry out a water drift test, and at least six groups of effective test data are collected to form a test set, wherein the test set is represented by R i;
S12, carrying out a water bleaching test of the test tire: replacing a reference tire with a test tire for a water drift test, and collecting at least six groups of effective test data as a test set, wherein the test set is denoted by T n;
s13, after the first group of T 1 is tested, repeating two groups of T n tests at most;
s14, carrying out a final water drift test of the reference tire: replacing the test tire with the reference tire in the step S1 for a water drift test, and collecting at least six groups of effective test data as a test set, wherein the test set is represented by R f; thereby completing a test cycle;
S2, calculating a water drift critical test vehicle speed average value:
wherein:
: the average value of the speed of the water drift critical test of the ith group of test sets of the test tires is expressed in meters per second;
v aqua,ji: testing the speed of a water drift critical test of a jth test in a test set of a ith group of water drift tests of the tire, wherein the unit is meter per second;
n: testing the number of effective tests of the tire in its corresponding test cycle;
s3, calculating a weighted water drift critical test vehicle speed average value of a reference tire corresponding to the test tire according to the table 1:
TABLE 1
In the table of the present invention,(R) is a weighted water drift critical test vehicle speed average for a reference tire corresponding to the test tire; Is the average value of the water drift critical test vehicle speed of the reference tire in the step S11,/> Is the average value of the speed of the critical test of the water drift of the reference tire in the step S14,/>The average value of the water drift critical test vehicle speed of the test tires in the steps S12 and S13;
S4, calculating a water drift performance index AI, wherein the water drift performance index represents the relative percentage of the gripping performance of the test tire and the reference tire on the wet road surface, and the calculation method comprises the following steps:
AI=×100%。
2. The method for testing the longitudinal water drift of the car tire according to claim 1, wherein the step S2 further comprises a test result testing step of:
Coefficient of variation of the measured water-drift critical test vehicle speed of the test tire > 5%, The group should be retested, coefficient of variation/>Calculated as follows:
wherein: To test tire I standard deviation.
3. The method for testing the longitudinal water drift of the car tire according to claim 1, wherein,
(A) The test cycle sequence for the three groups of test tires is as follows:
Ri-T1-T2-T3-Rf；
(b) The test of the five test tires included two cycles, the cycle sequence being as follows:
Ri-T1-T2-T3-Rf/Ri-T4-T5-Rf。
4. The method of claim 2, wherein step S1 is preceded by mounting a vehicle speed meter on the vehicle, mounting a wheel speed sensor on the vehicle drive wheel, and subsequently calibrating the wheel speed sensor.
5. The method for testing the longitudinal drift of the car tire according to claim 1, wherein the test vehicle is accelerated to an initial speed of 50km/h in a starting section, and after entering a water accumulation road surface, the first 30m of the road is used for stabilizing the test vehicle speed, and the subsequent 50m area is subjected to full throttle acceleration.
6. The method for testing the longitudinal water drift of the car tire according to claim 5, wherein the test is repeated if the slip rate s between the car tires in the test area reaches 10% in the acceleration process, and if the slip rate s reaches 10%, at least six effective tests are completed; if the slip rate s still does not reach 10% in the repeated test, the initial speed of the vehicle entering the test area is continuously increased until the slip rate s reaches 10% in the test area.
7. The method for testing the longitudinal drift of the car tire according to claim 1, wherein in order to reduce the test error, the recognition systems are respectively arranged on a test road section and a test vehicle, and once the test vehicle enters a test area, the full accelerator is accelerated and controlled to test in the same area of the road surface of the test area; the test is performed in high gear.
8. The method for testing the longitudinal water drift of a car tyre according to claim 1, characterized in that each time the water drift test is performed in the same direction within the same test cycle; when a plurality of test cycles are continuously performed, the final water float test of the reference tire in the previous test cycle is used as the initial water float test of the reference tire in the next test cycle.
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