CN113624518B - Tire bid test scoring method - Google Patents
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- CN113624518B CN113624518B CN202110578345.5A CN202110578345A CN113624518B CN 113624518 B CN113624518 B CN 113624518B CN 202110578345 A CN202110578345 A CN 202110578345A CN 113624518 B CN113624518 B CN 113624518B
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Abstract
The invention provides a tire racing test scoring method, which comprises a dry land braking project, a wet land braking project, a dry land control project, a wet land control project, an in-vehicle noise project and a wear resistance test project, wherein each set of tires is scored and evaluated for single performance of each set of tires, and finally the final score of each set of tires is obtained by multiplying the score of each project by the scoring weight of the project, so that the comprehensive performance of the tires is evaluated. The invention can accurately know the single level and score of each brand of tire in the group of comparison tires, such as dry braking, wet braking, dry control, wet control, noise in a vehicle, and the level and score of comprehensive performance, so as to analyze and compare the performance scores of each brand of tire after each single test and comprehensive performance test, and evaluate the tire performance in more detail.
Description
Technical Field
The invention belongs to the field of tire evaluation, and particularly relates to a tire bid test scoring method.
Background
The tyre is used as the only part of the automobile contacting with the ground, is an important component of the driving system of the automobile, provides the longitudinal force and the lateral force required for accelerating, braking and steering of the automobile, is a key part for ensuring the safety, the dynamic property, the comfort and the stability of the automobile in the running process of the automobile, and has very important influence on the performance of the whole automobile.
The important index of the tire safety performance when the longitudinal braking distance of the tire directly influences the running safety of the vehicle. The noise of the tire has a certain influence on the noise in the vehicle during the running process of the vehicle, and the riding comfort of the rider is directly related. The steering performance of the tire also influences the steering performance of the whole vehicle, and has certain influence on the running safety and the driving feeling of the vehicle.
Tires on the market are various, and consumers cannot accurately understand the comprehensive performance evaluation of a certain tire or a plurality of tires, so that an evaluation method is needed to effectively evaluate the tires.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for testing and scoring a tire racing product, which is used for testing and evaluating several groups of tires with similar levels or pre-selected tires, so that the single level and score of each brand of tire in the group of comparative tires, such as dry braking, wet braking, dry handling, wet handling, noise in a vehicle, wear resistance, and the level and score of the comprehensive performance can be accurately known, and further, the performance score of each tire after each single test and the comprehensive performance test can be analyzed and compared, and the tire performance can be evaluated in more detail.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a tire bid test scoring method is used for performing test scoring on various brands of tires and is characterized in that: the tire test comprises a dry land braking project, a wet land braking project, a dry land control project, a wet land control project, an in-vehicle noise project and a wear resistance test project;
the method comprises the steps that when a vehicle provided with a tested tire is decelerated from one preset speed to another preset speed in a dry braking project and a wet braking project, the distance S and the average deceleration AD of the vehicle are obtained, the maximum value of the average deceleration AD in the tire is taken as a reference tire, full tires are taken, and other tires are compared with the reference tire, so that the score of the tire in the project is obtained;
the dry land control project and the wet land control project are characterized in that when a driver drives a certain path for a plurality of times according to a rule and obtains an average circle of tire driving, the tire with the least average circle is taken as a reference tire, full fraction is taken, and other tires are compared with the reference tire to obtain the score of the tire in the project;
the noise items in the vehicle respectively collect noise values near the right ear of a driver when the driver runs on the coarse asphalt pavement and the fine asphalt pavement, score the noise values obtained by running on the coarse asphalt pavement and the fine asphalt pavement respectively, take the tire with the smallest noise value as a reference tire, take full score, and score other tires after comparing with the reference tire; and finally, taking an average value of the scores of the same tyre running on the coarse asphalt and the fine asphalt, and further obtaining the average score of each set of tyre noise items in the vehicle.
The wear resistance test project is used for respectively calculating mileage lives of a left front tire and a right front tire of a vehicle provided with a test tire, calculating mileage life average values of the left front tire and the right front tire of the tire, taking the maximum value of the mileage life average values in a plurality of sets of tires as a reference tire, taking full score, and comparing other tires with the reference tire to obtain the score of the tire in the project;
the final score for each set of racing tires is the sum of the score for each item multiplied by the scoring weight for that item, and tire performance is assessed by comparing the multiple sets of racing tires final scores.
Compared with the prior art, the tire bid test scoring method has the following beneficial effects:
(1) According to the invention, the test evaluation is carried out on several groups of tires with similar levels or preselected levels, so that the single level and score of each brand of tire in the group of comparison tires, such as dry braking, wet braking, dry control, wet control, noise in a vehicle and wear resistance, and the level and score of the comprehensive performance can be accurately known, and the performance score of each tire after each single test and the comprehensive performance test can be analyzed and compared, so that the tire performance can be evaluated in more detail.
(2) Each set of tires is scored according to each item, each test item is compared by taking the tire with the best item performance as a reference, the tire with the best item performance is set to be full, other tires of the item are compared with the reference tire to obtain the score of the tire in the item, and the single item comparison is performed to better know the advantages and disadvantages of each set of tires.
(3) The dry land braking project, the wet land braking project, the dry land control project and the wet land control project are all tested for multiple times, unstable data before and after the test are removed, and the remaining data are averaged, so that the reliability of the data is ensured.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are merely used for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The present invention will be described in detail with reference to examples.
The tire competition product test scoring method is provided with a plurality of sets of tires, each set of tires is used for performing tire tests, and the tire tests comprise a dry land braking project, a wet land braking project, a dry land control project, a wet land control project, an in-vehicle noise project and a wear resistance test project;
the dry braking project is that under the testing condition of the dry braking project, the distance S and the average deceleration AD of a tested vehicle from 100km/h to 0km/h are reduced, the maximum value of the average deceleration AD in the tire is taken as a reference tire, full fraction is taken, and the scores of the tire in the project are obtained by comparing the other tires with the reference tire;
the wet land braking project is that under the testing condition of the wet land braking project, the distance S and the average deceleration AD of a tested vehicle from 80km/h to 20km/h are reduced, the maximum value of the average deceleration AD in the tire is taken as a reference tire, full fraction is taken, and the scores of the tire in the project are obtained by comparing other tires with the reference tire;
under the test conditions and driving requirements of the dry control project, recording the average circle of each tire dry control project, taking the tire with the least average circle as a reference tire, taking full score, and comparing other tires with the reference tire to obtain the score of the tire in the project;
under the test conditions and driving requirements of the wetland control project, the wetland braking project records the average circle of each set of tire wetland control project, the tire with the least average circle is taken as a reference tire, the full fraction is taken, and other tires are compared with the reference tire to obtain the score of the tire in the project;
under the test condition of the noise item in the vehicle, when the vehicle runs on a rough asphalt pavement, collecting noise values beside the right ear of a driver, taking 3 noise value records in a centralized distribution mode, taking the average value of the 3 noise value records in the centralized distribution mode for each tire, taking the tire with the smallest noise value as a reference tire, taking full score, and comparing other tires with the reference tire to obtain the score of the tire in the item; then, when the vehicle runs on the fine asphalt pavement, obtaining the scores of the noise items in each set of tire vehicles on the fine asphalt pavement according to the same score dividing mode of running on the coarse asphalt pavement; and averaging the scores of the noise items in the same set of tire in the vehicle of the coarse asphalt and the fine asphalt to obtain the average score of the noise items in the vehicle of each set of tire.
Under the testing conditions and the testing method of the wear resistance test item, the mileage life of the left front tire and the right front tire in each set of tires is calculated respectively, the average value of the mileage life of the left front tire and the average value of the mileage life of the right front tire in each set of tires are calculated, the maximum value of the average value of the mileage life in a plurality of sets of tires is taken as a reference tire, the full fraction is taken, and the other tires are compared with the reference tire to obtain the fraction of the tire in the item;
the final score for each set of racing tires is the sum of the score for each item multiplied by the scoring weight for that item, and tire performance is assessed by comparing the multiple sets of racing tires final scores.
Each set of tires is scored for each item, and for each test item, the tire with the best performance of the item is used as a reference for comparison, the performance of the tire with the best performance of a single item is set to be full score, and the other tires of the item are compared with the reference tire to obtain the score of the tire in the item.
The final score for each set of racing tires is the sum of the score for each item multiplied by the scoring weight for that item, and tire performance is assessed by comparing the multiple sets of racing tires final scores.
Test conditions for the dry brake project: the road surface road is a compact asphalt road surface, and the gradient in any direction is not more than 2%; the pavement is paved in the same period, and has flat surface, uniform structure and uniform abrasion, and the surface is free of loose materials or foreign sediments; the maximum size of stones for paving a road surface is 10mm (tolerance allowed to be 8-13 mm), and the depth of pavement construction measured according to ASTM E965-96 sanding method should be 0.7 + -0.3 mm; the meteorological conditions are good, and the wind power is not influenced by the test result; at the beginning of the test, the tire pressure was adjusted to 220kPa before the cold air pressure.
The dry brake project test method comprises the following steps: the test vehicle is accelerated to 105 + -2 km/h on the start-up section, the transmission is placed in a neutral position while the ABS system is activated to act on each wheel with a brake pedal force of not less than 600N rapidly acting on the brake pedal, and the brake pedal force is maintained until the vehicle stops. The distance S and the average deceleration AD of the vehicle travel from 100km/h down to 0km/h are obtained.
Taking the maximum value of the average deceleration AD in the tire as a reference tire, taking full score, and comparing other tires with the reference tire to obtain the score of the tire in the project;
the data of the first two tests after each test or tire replacement is not needed, each set of test tire needs to be subjected to 6 effective tests, the C.V. of the variation coefficient (the ratio of the standard deviation of the test to the average value) of the effective data is ensured to be within 3%, the test result is judged to be effective, otherwise, all the tests should be carried out again.
Test conditions of the wet land braking project: the road surface road is a compact asphalt road surface, and the gradient in any direction is not more than 2%; the pavement is paved in the same period, and has flat surface, uniform structure and uniform abrasion, and the surface is free of loose materials or foreign sediments; the maximum size of stones for paving a road surface is 10mm (tolerance allowed to be 8-13 mm), and the depth of pavement construction measured according to ASTM E965-96 sanding method should be 0.7 + -0.3 mm; the road surface can be used as a roadside water spraying device, and the water spraying device can be connected to a test vehicle or a trailer. If the roadside water spraying device is used, water is sprayed to the road surface at least 0.5h before the test so that the water temperature and the road surface temperature reach balance, and the depth of the water film of the road surface is 0.5-1.5 mm. If the water spraying device is arranged on the test vehicle or the trailer, the water film sprayed by the nozzle should be uniform, the extension width is at least 25mm wider than the tire ground contact surface, the position of the water contacting the ground should be 250-450 mm in front of the center of the tire ground contact surface, the water spraying speed should ensure that the depth of the water film meets the regulation, and the water spraying speed change is kept within +/-10% in the test process.
The weather condition is required to be good, the wind speed is not more than 3m/s, so that the uniformity of the pavement water film is not affected, and a wind shielding barrier can be adopted if necessary. The temperature of the test pavement and the environment should be controlled between 5 ℃ and 35 ℃, and the temperature change of the test pavement should not exceed 10 ℃ in the test process. At the beginning of the test, the tire pressure was adjusted to 220kPa for cold air pressure.
The wetland test method comprises the following steps: accelerating the test vehicle to 85+/-2 km/h on a starting section, placing the gearbox at a neutral position, and simultaneously rapidly pressing a brake pedal to activate the ABS system, so that the ABS system acts on each wheel, and maintaining the force of the brake pedal until the vehicle stops. The distance S and average deceleration AD of the vehicle run from 80km/h down to 20km/h were tested.
Taking the maximum value of the average deceleration AD in the tire as a reference tire, taking full score, and comparing other tires with the reference tire to obtain the score of the tire in the project.
The data of the previous two tests of each test or new tire replacement are not needed, each set of test tire needs to be subjected to 6 effective tests, the variation coefficient C.V. of the effective data is ensured to be within 3%, the test result is judged to be effective, and otherwise, the test is carried out again. And recording relevant environmental parameters such as water film thickness, water film temperature, environmental temperature, wind speed and the like in the test process.
The dry handling project test conditions: the temperature of the test pavement is controlled to be more than 0 ℃, the temperature change of the test pavement in the test process is not more than 10 ℃, and the average wind speed in the test process is not more than 5m/s; when the test starts, the tire pressure is adjusted to 220kPa of cold air pressure; the driver who carries out the tire dry-run test has the ability to drive the vehicle to travel at the limit on the dry-run road;
the dry maneuver project driving requirement: under the same test conditions, a tester drives the vehicle in a specified control road, and the driver fully exerts the transverse ground grabbing performance and the longitudinal ground grabbing performance of the tested tire in the driving process and records the driving time of each circle of the vehicle; and 8 circles of tests are carried out on each set of tires, 6 circles of effective values are taken, an average value is taken, when the average circle of each set of tires on a dry control project is obtained, the tire with the least average circle is taken as a reference tire, full-divided tires are taken, and other tires are compared with the reference tire to obtain the score of the tire in the project.
The data of the previous two tests of each test or new tire replacement are not used, and the variation coefficient C.V of the effective data is required to be less than 1%; and recording environmental parameters in the test process, wherein the environmental parameters comprise the environmental temperature, the ground temperature and the wind speed.
The experimental conditions of the wetland control project are as follows: the thickness of the water film is 0.5-2 mm, the temperature of the water film is 5-35 ℃, the temperature change of the road surface is not more than 10 ℃ in the test process, the average wind speed is not more than 5m/s in the test process, and the uniformity of the water film on the road surface is maintained; when the test starts, the tire pressure is adjusted to 220kPa of cold air pressure; the driver who carries out the tire wet-land control test has the capability of driving the vehicle to travel on the wet control road at the limit;
the wetland control project driving requirement: a tester drives a vehicle in a track with uniform water film thickness by designating a wetland control test road, using the same test vehicle and the same test conditions, driving the vehicle to the grip limit of a tire on the wetland control road, and recording the driving time t of each circle of the vehicle; and 8 circles of tests are carried out on each set of tires, 6 circles of effective values are taken, an average value is taken, when the average circle of each set of tire wetland operation projects is obtained, the tire with the least average circle is taken as a reference tire, full-divided tires are taken, and other tires are compared with the reference tire to obtain the score of the tire in each project.
Discarding the data of the previous two tests of each test or new tire replacement, wherein the variation coefficient C.V of the effective data is less than 1%, otherwise, the test should be carried out again; and recording environmental parameters of the wetland control project in the test process, wherein the environmental parameters of the wetland control project comprise environmental parameters such as environmental temperature, ground temperature, wind speed and the like.
The in-car noise project test conditions are as follows: the ambient temperature is required to be within the range of 5-35 ℃ and the wind speed is not more than 5m/s. The lower limit of the measurement dynamic range, determined by the background noise and the instrument internal electrical noise, should be at least 10dB below the measured sound level. The sound level meter should meet the type I requirements specified in GB/T3785, the sound level meter adopts A-level weight sampling frequency, sampling time adopts F-level weight, and the sound level meter is calibrated by a sound calibrator before each test. At the beginning of the test, the tire pressure was adjusted to 220kPa for cold air pressure.
The in-car noise project testing method comprises the following steps: the tire is fully heated before the test starts, and the test vehicle runs at a constant speed according to a specified test speed (coarse asphalt=60 km/h; fine asphalt=80 km/h) after entering a test road. And using the same test vehicle to run in the same direction, carrying out 3-5 times of tests on the same test starting point and the same vehicle speed, continuously collecting noise values beside the right ear of a driver for 10 seconds each time, taking 3 noise value records distributed and concentrated, sequentially measuring the noise of the coarse asphalt and the fine asphalt pavement, and replacing the tire to repeat the process.
When the vehicle runs on the rough asphalt pavement, collecting noise values near the right ear of a driver, taking 3 noise value records in a distribution set, taking the average value of the 3 noise value records in the distribution set for each set of tires, taking the tire with the smallest noise value as a reference tire, taking full score, and comparing other tires with the reference tire to obtain the score of the tire in the project; then, when the vehicle runs on the fine asphalt pavement, obtaining the score of each set of tire in-vehicle noise item on the fine asphalt pavement according to the same score of the vehicle running on the coarse asphalt pavement; and averaging the scores of the noise items in the same set of tire in the vehicle of the coarse asphalt and the fine asphalt to obtain the average score of the noise items in the vehicle of each set of tire.
The wear resistance test item test conditions are as follows: the manufacturers of the test vehicles should be the same model year and should have the same drive system, the same brakes and suspension components, etc. The driver seating area of the test vehicle should remain as heavy as the most heavy driver in the fleet and load 75kg of load, which is about one passenger weight, at the co-driver's location. The tire was mounted on a rim prescribed in GB/T2978 and inflated, and the tire pressure was adjusted to 220kP. The tire and wheel assembly should be tested for dynamic balance, and the rim must not jump more than 0.9mm in radial and lateral directions.
The wear resistance test project test method comprises the following steps: running and process control vehicles run in and out simultaneously, the same route is run, tires, vehicles and drivers adopt a method of internal circulation of groups, and the vehicles exchange drivers every day; exchanging tires every 3 days when the vehicle runs, wherein the positions of the tires on the vehicle are the same before and after the tires are exchanged; the influence of the external factors on the wear resistance of the tire during running and process is eliminated as much as possible. Every 9 days (1 cycle) the vehicle was driven, the driving wheel sipes were measured until the mileage reached the end of the 2 ten thousand metric tests.
Carrying out least square six-point linear regression analysis on the tire pattern depth and the corresponding driving mileage:
wherein:
y represents the pattern depth of the test tire in mm;
x represents the actual driving mileage of the test tire, and the unit is km;
a represents the intercept of the linear regression line on the y axis, namely the theoretical value of the initial groove depth, and the unit is mm;
b represents the slope of the linear regression line, namely the tire abrasion amount corresponding to each 1000km of running of the test tire, and the unit is mm/1000km;
n is the number of cycles that the driving fleet is driving according to a predetermined planned route in the tire wear test;
obtaining a target mileage life of the test tire:
wherein:
m represents the target mileage life of the test tire in km;
c represents the height of the tread wear indicator of the test tire in mm.
Calculating mileage life of a left front tire and a right front tire of each set of tires respectively, calculating mileage life average values of the left front tire and the right front tire of each set of tires, taking the maximum value of the mileage life average values of the sets of tires as a reference tire, taking full parts, and comparing other tires with the reference tire to obtain the score of the tire in the project;
the foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The utility model provides a tire race test scoring method for test scoring is carried out multiple brand tire, its characterized in that: the tire test comprises a dry land braking project, a wet land braking project, a dry land control project, a wet land control project, an in-vehicle noise project and a wear resistance test project;
when the vehicle provided with the test tire is decelerated from one preset speed to another preset speed in the dry braking project and the wet braking project, the distance S and the average deceleration AD of the vehicle are obtained, the maximum value of the average deceleration AD in the tire is taken as a reference tire, full fraction is taken, and other tires are compared with the reference tire, so that the score of the tire in the project is obtained;
the dry land control project and the wet land control project are characterized in that when a driver drives a certain path for a plurality of times according to a rule and obtains an average circle of tire driving, the tire with the least average circle is taken as a reference tire, full fraction is taken, and other tires are compared with the reference tire to obtain the score of the tire in the project;
the noise items in the vehicle respectively collect noise values near the right ear of a driver when the driver runs on the coarse asphalt pavement and the fine asphalt pavement, score the noise values obtained by running on the coarse asphalt pavement and the fine asphalt pavement respectively, take the tire with the smallest noise value as a reference tire, take full score, and score other tires after comparing with the reference tire; finally, taking an average value of the scores of the same tyre running on the coarse asphalt and the fine asphalt, and further obtaining an average score of each set of tyre in-vehicle noise project;
the wear resistance test project is used for respectively calculating mileage lives of a left front tire and a right front tire of a vehicle provided with a test tire, calculating mileage life average values of the left front tire and the right front tire of the tire, taking the maximum value of the mileage life average values in a plurality of sets of tires as a reference tire, taking full score, and comparing other tires with the reference tire to obtain the score of the tire in the project;
the final score for each set of racing tires is the sum of the score for each item multiplied by the scoring weight for that item, and tire performance is assessed by comparing the multiple sets of racing tires final scores.
2. The method for testing and scoring a tire bid of claim 1, wherein: test conditions for the dry brake project: the road surface is a compact asphalt road surface, and the gradient in any direction is not more than 2%; the pavement is paved at the same time, and has the advantages of flat pavement, uniform structure and uniform abrasion, and the surface is free of loose materials or foreign sediments; the maximum size of stones for paving a road surface is 10mm, and the depth of the road surface structure measured according to the ASTM E965-96 sanding method should be 0.7.+ -. 0.3mm; the meteorological conditions are good, and the wind power is not influenced by the test result; when the test starts, the tire pressure is adjusted to 220kPa before the cold air pressure;
the test method of the dry braking project comprises the following steps: accelerating the test vehicle to 105+/-2 km/h at a starting section, placing the gearbox at a neutral position, simultaneously rapidly acting a brake pedal force of not less than 600N on a brake pedal to activate an ABS system to act on each wheel, and maintaining the brake pedal force until the vehicle stops; the data of the previous two tests of each test or new tire replacement are not needed, each set of test tire is required to complete 6 effective tests, the variation coefficient C.V. of the effective data is within 3%, and the distance S and the average deceleration AD of the vehicle from 100km/h to 0km/h are tested.
3. A method of testing and scoring a tire bid as in claim 1, wherein: test conditions of the wet land braking project: the road surface is a compact asphalt road surface, and the gradient in any direction is not more than 2%; the pavement is paved at the same time, and has the advantages of flat pavement, uniform structure and uniform abrasion, and the surface is free of loose materials or foreign sediments; the maximum size of stones for paving a road surface is 10mm, and the depth of the road surface structure measured according to the ASTM E965-96 sanding method should be 0.7.+ -. 0.3mm; the test pavement adopts a roadside water spraying device or is connected with a water spraying device on a test vehicle; if the roadside water spraying device is used, water is sprayed to the road surface at least 0.5h before the test so that the water temperature and the road surface temperature reach balance, and the depth of the water film of the road surface is 0.5-1.5 mm; if the water spraying device is arranged on the test vehicle, the water film sprayed by the nozzle should be uniform, the extension width is at least 25mm wider than the tire ground contact surface, the position of the water contacting the ground is 250-450 mm in front of the center of the tire ground contact surface, the water spraying speed should ensure that the depth of the water film meets the regulation, and the water spraying speed change is kept within +/-10% in the test process; the weather condition is required to be good, the wind speed is not more than 3m/s, and the uniformity of a pavement water film is maintained; the temperature of the test pavement and the environment should be controlled between 5 ℃ and 35 ℃, and the temperature change of the test pavement in the test process should not exceed 10 ℃; when the test starts, the tire pressure is adjusted to 220kPa of cold air pressure;
the test method of the wetland braking project comprises the following steps: accelerating the test vehicle to 85+/-2 km/h at a starting section, placing the gearbox at a neutral position, and simultaneously rapidly stepping on a brake pedal to activate an ABS system, so that the ABS system acts on each wheel, and maintaining the force of the brake pedal until the vehicle stops; the data of the previous two tests of each test or new tire replacement are not needed, each set of test tire is required to complete 6 effective tests, the variation coefficient C.V. of the effective data is within 3%, and the distance S and the average deceleration AD of the vehicle from 80km/h to 20km/h are tested.
4. A method of testing and scoring a tire bid as in claim 1, wherein: the dry handling project test conditions: the temperature of the test pavement is controlled to be more than 0 ℃, the temperature change of the test pavement in the test process is not more than 10 ℃, and the average wind speed in the test process is not more than 5m/s; when the test starts, the tire pressure is adjusted to 220kPa of cold air pressure; the driver who carries out the tire dry-run test has the ability to drive the vehicle to travel at the limit on the dry-run road;
the dry maneuver project driving requirement: under the same test conditions, a tester drives the vehicle in a specified control road, and the driver fully exerts the transverse ground grabbing performance and the longitudinal ground grabbing performance of the test tire in the driving process and records the driving time of each circle of the vehicle; each set of tires is tested for 8 circles, 6 circles of effective values are taken and averaged, and the average circle of each set of tires on the dry handling project is obtained.
5. A method of testing and scoring a tire bid as in claim 1, wherein: the experimental conditions of the wetland control project are as follows: the thickness of the water film is 0.5-2 mm, the temperature of the water film is 5-35 ℃, the temperature change of the road surface is not more than 10 ℃ in the test process, the average wind speed is not more than 5m/s in the test process, and the uniformity of the water film on the road surface is maintained; when the test starts, the tire pressure is adjusted to 220kPa of cold air pressure; the driver who carries out the tire wet control test has the ability to drive the vehicle to travel at the limit on the wet control road;
the wetland control project driving requirement: a tester drives a vehicle in a track with uniform water film thickness by designating a wetland control test road, using the same test vehicle and the same test conditions, driving the vehicle to the grip limit of a tire on the wetland control road, and recording the driving time t of each circle of the vehicle; and 8 times of tests are carried out on each set of tires, 6 times of effective values are taken, and an average value is taken, so that the average circle time of each set of tire wetland control project is obtained.
6. A method of testing and scoring a tire bid as in claim 1, wherein: the in-car noise project test conditions are as follows: the ambient temperature is within the range of 5-35 ℃ and the wind speed exceeds 5m/s; the lower limit of the measuring dynamic range determined by the background noise and the internal electrical noise of the instrument is at least 10dB lower than the measured sound level; the sound level meter meets the I-type requirement specified by GB/T3785, adopts A-level weight sampling frequency, adopts F-level weight for sampling time, and is calibrated by a sound calibrator before each test; when the test starts, the tire pressure is adjusted to 220kPa of cold air pressure;
the in-car noise project testing method comprises the following steps: fully heating the tire before the test starts, and after the test vehicle enters a test road, driving at a constant speed of 60km/h on a coarse asphalt road and driving at a constant speed of 80km/h on a fine asphalt road; the test personnel drive the same test vehicle, the same driving direction, the same test starting point and the same vehicle speed for 3-5 times, each time lasts for 10 seconds, the noise value beside the right ear of the driver is collected, the noise value record in 3 distribution sets is taken, the noise values of the coarse asphalt and the fine asphalt pavement are measured in sequence, and the tire is replaced to repeat the process.
7. A method of testing and scoring a tire bid as in claim 1, wherein: the wear resistance test item test conditions are as follows: the manufacturers of test vehicles should have the same model year and the same vehicle setup including drive system, brake, suspension components; the driver seat area of the test vehicle remains equal to the driver with the largest weight in the fleet and is loaded with 75kg of load of about one passenger weight at the position of the co-driver; mounting the tire on a rim specified in GB/T2978, and inflating, wherein the tire pressure is adjusted to 220kP; the tire and wheel assembly should be subjected to dynamic balance test, and the radial and lateral runout of the rim is not more than 0.9mm;
the wear resistance test project test method comprises the following steps: running and process control vehicles run in and out simultaneously, the same route is driven, tires, vehicles and drivers adopt a method of internal circulation of groups, and each time the vehicles run for one day, the drivers are exchanged; exchanging tires every three days when the vehicle runs, wherein the positions of the tires on the vehicle are the same before and after the tires are exchanged; eliminating the influence of the external factors on the wear resistance of the tire in the running and process as much as possible; measuring the driving wheel tyre groove every time the vehicle runs for one cycle until the driving mileage reaches the end of the test of twenty thousand kilometers, wherein the one cycle is nine days;
carrying out least square six-point linear regression analysis on the tire pattern depth and the corresponding driving mileage:
wherein:
y represents the pattern depth of the test tire in mm;
x represents the actual driving mileage of the test tire, and the unit is km;
a represents the intercept of the linear regression line on the y axis, namely the theoretical value of the initial groove depth, and the unit is mm;
b represents the slope of the linear regression line, namely the corresponding tire abrasion amount of the test tire per 1000km of running, and the unit is mm/1000km;
n is the number of cycles that the driving fleet is driving according to a predetermined planned route in the tire wear test;
obtaining a target mileage life of the test tire:
wherein:
m represents the target mileage life of the test tire in km;
c represents the height of the tread wear indicator of the test tire in mm.
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| FR2796459A1 (en) * | 1999-07-13 | 2001-01-19 | Michelin Soc Tech | Method for predicting the acoustic and vibration level inside a moving automobile |
| JP2015004602A (en) * | 2013-06-21 | 2015-01-08 | 住友ゴム工業株式会社 | Performance evaluation method of tire |
| CN105829185A (en) * | 2013-12-18 | 2016-08-03 | 米其林集团总公司 | Steering spline telescoping shaft, and steering device |
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