A test method for evaluating vehicle drift.

Abstract

This invention discloses a test method for evaluating vehicle drift. The method utilizes a white lime powder funnel, a central axis, and a suitable test site. During the drift evaluation test, the white lime powder funnel is rigidly connected to the rear center of the test vehicle using a mounting plate on a suitable road surface. The height of the white lime powder funnel from the road surface is 20mm. Combined with the use of the central axis and the test vehicle, the test vehicle must maintain a constant speed of 30kph for a distance of 100m to complete the vehicle drift evaluation test. This method eliminates the need for electronic devices to control and assist in the evaluation, improving the convenience of the vehicle drift evaluation test and facilitating its implementation.

Description

Technical Field

[0001] This invention relates to the field of vehicle drift testing technology, specifically a test method for evaluating vehicle drift. Background Technology

[0002] Vehicle deviation refers to the phenomenon where a vehicle, which should travel along the expected trajectory, deviates from its intended path during driving. This can easily lead to serious traffic accidents. Therefore, a simple test method is used to determine whether a vehicle will deviate during driving.

[0003] According to Chinese Patent CN109515517A, a vehicle deviation identification system and method exist. However, some existing vehicle deviation evaluation test methods describe the use of electronic devices to control and assist in testing and evaluating vehicle deviation, without providing guidance on methods for actually measuring deviation during actual vehicle operation. Therefore, this invention aims to provide a simple method for measuring vehicle deviation. Summary of the Invention

[0004] The purpose of this invention is to provide a test method for evaluating vehicle drift, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for evaluating vehicle drift during driving, comprising the following steps:

[0006] S1: First, find a test site. The test site should be a dry, clean, and hard road surface. The test vehicle should first drive at a stable speed of 30 kph for about 2000 m. Then, drive the test vehicle to the prepared site. The road surface has a center line drawn in the middle to make it easy for the test vehicle to align its center with the center line before driving, which serves as a reference. The distances at the edges of the road surface have also been measured and marked at 0 m, 50 m, and 100 m to facilitate the evaluation test of the test vehicle's handling during the driving deviation process.

[0007] S2: Install a white lime powder funnel at the middle of the rear of the test vehicle, ensuring that the lime powder can leak out from the bottom of the white lime powder funnel at a speed of not less than 10ml / s. After the white lime powder funnel is installed at the middle of the rear of the test vehicle, the gap between the white lime powder funnel and the road surface should be 20mm. The white lime powder funnel should be rigidly connected to the rear of the test vehicle, and the white lime powder funnel should not move relative to the body of the test vehicle during the test vehicle's operation.

[0008] S3: Stop the test vehicle at the 0m position marked on the side of the road. The 0m position is the adjustment position. The vehicle's driving direction must also coincide with the center axis of the road. Then, accelerate the test vehicle's speed from 0 to 30kph. The test vehicle will then drive to the 50m position marked on the side of the road. The 50m position is the starting evaluation position for this test. The vehicle speed must reach 30kph and be maintained at a constant speed. The center position of the vehicle must coincide with the center axis L. Do not touch the steering wheel with both hands. After driving 50m, the test vehicle will enter the 100m position marked on the side of the road. When the rear wheels of the test vehicle pass the evaluation end position, hold the steering wheel with both hands and brake until the vehicle stops.

[0009] S4: After the test vehicle travels from 0m to 100m, the entire test section is completed. Then, the maximum lateral distance between the lime powder sprinkled from the white lime powder funnel on the ground and the center line of the road is measured. When the deviation distance S between the lime powder sprinkled from the white lime powder funnel on the ground and the center line of the road is ≥0.8m, the test vehicle is judged to have serious deviation; when the deviation distance S is ≥0.3m and ≤0.8m, the test vehicle is judged to have a tendency to deviation; when the measured deviation distance S is ≤0.3m, the test vehicle is judged to have no deviation.

[0010] The road surface requirements for the test site are as follows: the longitudinal slope of the road surface ≤2%, the ambient air temperature of the test site should be within the range of 0~40℃, and the wind speed at the test site during the test should be ≤10kph; at the same time, the vehicle break-in mileage ≥20km, and the vehicle positioning parameters, chassis key torque, braking performance and tire pressure should all meet the manufacturer's design requirements.

[0011] The mounting plate is bolted to the lower rear side of the test vehicle, and the white lime powder funnel is fixedly installed directly below the mounting plate. A manual valve is installed on the lower outlet side of the white lime powder funnel, which controls the leakage rate of lime powder from the white lime powder funnel.

[0012] The test vehicle traveled a total of 100m during the test. The side markings on the road surface divided it into three stages: 0m, 50m, and 100m. 0m was the adjustment position of the test vehicle, 50m was the starting evaluation position of the test vehicle, and 100m was the ending evaluation position of the test vehicle.

[0013] The lower outlet of the white lime powder funnel is positioned opposite to the central axis of the road surface.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention involves setting up a white lime powder funnel, a central axis, and a suitable test site. The white lime powder funnel is rigidly connected to the rear center of the test vehicle using a mounting plate. The height of the white lime powder funnel from the road surface is 20mm. The test vehicle is then driven at a stable speed of 30kph for approximately 2000m. Next, the test vehicle is driven onto the prepared test site and parked at the 0m mark on the side of the road surface, ensuring that the middle of the vehicle body coincides with the central axis of the road surface. The manual valve at the outlet of the white lime powder funnel is then opened, ensuring that lime powder leaks from the outlet at a rate of not less than 10ml / s. The leaked lime powder will accumulate on the surface of the central axis. The test vehicle's speed is then accelerated from 0 to 30kph, and the vehicle travels to the 50m mark on the side of the road surface. The 50m mark is the starting evaluation position for this test. The vehicle speed must reach 30kph and be maintained at this point. Under constant speed, the center of the test vehicle must remain aligned with the central axis L, and both hands must not touch the steering wheel. After traveling another 50m, the test vehicle will enter the 100m mark on the side of the road. When the rear wheels of the test vehicle pass the end of the evaluation, both hands should grip the steering wheel and brake until the vehicle stops. Then, the maximum lateral distance between the lime powder sprinkled from the white lime powder funnel on the ground and the central axis of the road is measured. If the deviation S of the lime powder sprinkled from the white lime powder funnel on the ground and the central axis of the road is ≥0.8m, the test vehicle is judged to have serious deviation; if the deviation S is ≥0.3m and ≤0.8m, the test vehicle is judged to have a tendency to deviation; if the measured deviation S is ≤0.3m, the test vehicle is judged to have no deviation. This method can be applied to the whole vehicle driving deviation evaluation test without the need for electronic devices to control and assist in the evaluation test, improving the convenience of the whole vehicle driving deviation evaluation test and facilitating the implementation of this method. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the quicklime powder funnel structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the vehicle's driving trajectory according to the present invention;

[0019] Figure 4 This is a schematic diagram illustrating the measurement of vehicle deviation during driving, as per the present invention.

[0020] In the diagram: 1. Test vehicle; 2. Wheels; 3. White lime powder funnel; 4. Mounting plate; 5. Mounting bolts; 6. Manual valve. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] It should be noted that when an element is referred to as "fixed," "mounted," "connected," or "set" with another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0023] As a further improvement of the present invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0024] Please see Figure 1-4 This invention provides a technical solution: a test method for evaluating vehicle drift, comprising a test vehicle 1, wheels 2, a quicklime powder funnel 3, a mounting plate 4, mounting bolts 5, and a manual valve 6.

[0025] S1: First, find a test site. The test site should be a dry, clean, and hard surface, such as cement or asphalt. Test vehicle 1 should first drive at a stable speed of 30 kph for about 2000 m. Then, drive test vehicle 1 to the prepared site. The center line is drawn in the middle of the road surface to facilitate the alignment of the test vehicle with the center line of the road before driving, which serves as a reference. The distances at the edges of the road surface have also been measured and marked at 0 m, 50 m, and 100 m to facilitate the evaluation test control during the test vehicle's deviation test.

[0026] S2: Install a white lime powder funnel 3 at the middle of the rear of the test vehicle 1, and ensure that the lime powder can leak out from the bottom of the white lime powder funnel 3 at a speed of not less than 10ml / s. After the white lime powder funnel 3 is installed at the middle of the rear of the test vehicle 1, the gap between the white lime powder funnel 3 and the road surface is 20mm. The white lime powder funnel 3 and the rear of the test vehicle 1 should be rigidly connected, and the white lime powder funnel 3 should not move relative to the body of the test vehicle 1 during the test vehicle 1's operation.

[0027] S3: Stop test vehicle 1 at the 0m position marked on the side of the road. The 0m position is the adjustment position. The vehicle's driving direction also needs to be aligned with the center axis of the road. Then, accelerate the speed of test vehicle 1 from 0 to 30kph. Test vehicle 1 will then drive to the 50m position marked on the side of the road. The 50m position is the starting evaluation position of this test. The vehicle speed must reach 30kph and be maintained at a constant speed. The center position of the vehicle must be aligned with the center axis L. Do not touch the steering wheel with both hands. After driving 50m, test vehicle 1 will enter the 100m position marked on the side of the road. When the rear wheels 2 of test vehicle 1 pass the evaluation end position, hold the steering wheel with both hands and brake until the vehicle stops.

[0028] S4: After test vehicle 1 travels from 0m to 100m, the entire test section is completed. Then, the maximum lateral distance between the lime powder sprinkled on the ground by the white lime powder funnel 3 and the center line of the road is measured. When the deviation distance S between the lime powder sprinkled on the ground by the white lime powder funnel 3 and the center line of the road is ≥0.8m, test vehicle 1 is judged to have serious deviation; when the deviation distance S is ≥0.3m and ≤0.8m, test vehicle 1 is judged to have a tendency to deviation; when the measured deviation distance S is ≤0.3m, test vehicle 1 is judged to have no deviation phenomenon.

[0029] Specifically: the longitudinal slope of the road surface should be ≤2%, the ambient air temperature of the test site should be within the range of 0~40℃, and the wind speed at the test site during testing should be ≤10kph; at the same time, the vehicle's break-in mileage should be ≥20km, and the vehicle's alignment parameters, key chassis torques, braking performance, and tire pressure should all meet the manufacturer's design requirements. The longitudinal slope of the road surface should be controlled to ≤2% to prevent the test vehicle 1 from deviating from its driving direction due to the longitudinal slope issue during driving. The ambient air temperature of the test site should also be controlled to the range of 0~40℃, and the wind speed at the test site during testing should be ≤10kph to avoid the temperature and wind speed affecting the driving direction of the test vehicle 1 and improve the accuracy of the test results when evaluating the test work.

[0030] The mounting plate 4 is bolted to the lower rear side of the test vehicle 1, and the white lime powder funnel 3 is fixedly installed directly below the mounting plate 4. A manual valve 6 is installed on the lower outlet side of the white lime powder funnel 3. The manual valve 6 controls the leakage speed of lime powder from the white lime powder funnel 3, making it convenient to install the white lime powder funnel 3 at the rear middle of the test vehicle 1 using the mounting plate 4. The manual valve 6 can be used to open the lower outlet of the white lime powder funnel 3, so that the lime powder in the white lime powder funnel 3 will leak out from the outlet, serving as a marking effect.

[0031] Wherein: the total travel distance of test vehicle 1 during the test is 100m. The side markings on the road surface divide it into three stages: 0m, 50m and 100m. 0m is the adjustment position of test vehicle 1, 50m is the starting evaluation position of test vehicle 1, and 100m is the end evaluation position of test vehicle 1. This makes it convenient for test vehicle 1 to judge the distance traveled during the driving test based on the 0m, 50m and 100m markings on the road surface during the evaluation test, and can also reduce the mileage traveled by test vehicle 1 during the driving test.

[0032] Wherein: the lower outlet of the white lime powder funnel 3 is set opposite to the middle axis of the road surface, so that when the lime powder inside the white lime powder funnel 3 is discharged from the lower outlet of the white lime powder funnel 3, the leaked lime powder will directly fall onto the middle axis of the road surface, which is convenient for later measurement by measuring the distance between the lime powder and the middle axis, so as to determine whether the test vehicle 1 deviates during the driving process based on the distance between the two.

[0033] Working principle: First, find a test site. The test site should be a dry, clean, and high-hardness surface, such as cement or asphalt. Test vehicle 1 will first drive at a stable speed of 30 kph for about 2000 m. Then, drive test vehicle 1 to the prepared site. The road surface has a centerline marked in the middle to facilitate alignment of the test vehicle with the centerline before driving, serving as a reference. The distances along the edges of the road surface have also been measured and marked at 0 m, 50 m, and 100 m to facilitate evaluation and control during the test vehicle's deviation test. White lime will be applied... The lime powder funnel 3 is rigidly connected to the middle of the rear end of the test vehicle 1 using the mounting plate 4. The height of the white lime powder funnel 3 above the road surface is 20mm. The manual valve 6 at the outlet of the white lime powder funnel 3 is opened, ensuring that lime powder can leak from the bottom of the white lime powder funnel 3 at a speed of not less than 10ml / s. The leaked lime powder will drip onto the surface of the central axis. The gap between the white lime powder funnel 3 and the road surface is 20mm. The white lime powder funnel 3 and the rear end of the test vehicle 1 should be rigidly connected, and the white lime powder funnel 3 should not move relative to the body of the test vehicle 1 during the test vehicle 1's operation. Then, test vehicle 1 is parked at the 0m position marked on the side of the road. The 0m position is the adjustment position, and the vehicle's direction of travel must also coincide with the center axis of the road. The speed of test vehicle 1 is then accelerated from 0 to 30 kph. Test vehicle 1 will then travel to the 50m position marked on the side of the road. The 50m position is the starting evaluation position for this test. The vehicle speed must reach 30 kph and be maintained at a constant speed. The center position of the vehicle must coincide with the center axis L. Both hands must not touch the steering wheel. After traveling 50m, test vehicle 1 will then proceed to the 100m position marked on the side of the road. When the rear wheels 2 of test vehicle 1 pass... After assessing the end position, hold the steering wheel with both hands and brake until the vehicle stops. After the test vehicle 1 travels from 0m to 100m, the entire test section is completed. Then, the maximum lateral distance between the lime powder sprinkled on the ground by the white lime powder funnel 3 and the center line of the road is measured. When the deviation distance S between the lime powder sprinkled on the ground by the white lime powder funnel 3 and the center line of the road is ≥0.8m, the test vehicle 1 is judged to have serious deviation; when the deviation distance S is ≥0.3m and ≤0.8m, the test vehicle 1 is judged to have a tendency to deviation; when the measured deviation distance S is ≤0.3m, the test vehicle 1 is judged to have no deviation.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle running deviation evaluation test method based on a whole vehicle, characterized by: Comprising the following steps: S1: first find a test site, test site should be dry and clean hard road, test vehicle (1) first at 30kph speed stable driving 2000m or so, then again to the prepared site in the test vehicle (1), the road surface in the middle of the middle axis, easy to test the vehicle in the driving, the middle of the test vehicle and the middle axis of the road surface alignment driving, play a reference effect, and the road surface edge also measured the interval, and in 0m, 50m and 100m place marked, easy to evaluate the test vehicle in the process of running off test control; S2: in the middle of the test vehicle (1) tail position installation of a white lime powder hopper (3), and ensure that the lime powder can be in the white lime powder hopper (3) from the bottom of the leakage, white lime powder hopper (3) installed in the middle of the test vehicle (1) tail position, the gap height between white lime powder hopper (3) and the road surface is 20mm, white lime powder hopper (3) and the tail of the test vehicle (1) should be rigid connection, and the test vehicle (1) in the process of driving, white lime powder hopper (3) relative to the test vehicle (1) body is not allowed to appear relative movement; S3: the test vehicle (1) stop in the road side marked 0m position, 0m position for the adjustment position, the vehicle driving direction also need to coincide with the center axis of the middle of the road, then the test vehicle (1) speed from 0 to 30kph, then the test vehicle (1) will run to the road side marked 50m position, 50m position for the start of the evaluation position of this test, vehicle speed needs to reach 30kph and keep uniform speed, the vehicle center position must coincide with the middle axis L, hands do not touch the steering wheel, driving mileage 50m, then the test vehicle (1) will enter the road side marked 100m position, when the test vehicle (1) rear wheel (2) through the evaluation end position, both hands hold the steering wheel and brake until the vehicle stops; S4: the test vehicle (1) from 0m to 100m position, then complete the test of all road section, then according to the white lime powder hopper (3) falling on the ground lime powder and the maximum lateral distance of the road surface middle axis is measured, when the white lime powder hopper (3) falling on the ground lime powder and the road surface middle axis deviation distance S≥0.8m, the test vehicle (1) is determined to exist serious deviation; and deviation distance S≥0.3m, and ≤0.8m, then the test vehicle (1) is determined to exist deviation trend; the measured deviation distance S≤0.3m, then the test vehicle (1) is determined to be no deviation phenomenon.

2. The test method for evaluating vehicle running deviation based on whole vehicle driving according to claim 1, characterized in that: The road surface of the test site requires that the longitudinal slope of the road surface is ≤2%, the ambient temperature of the test site should be in the range of 0~40℃, and the wind speed of the test site during testing is ≤10kph; at the same time, the vehicle running mileage is ≥20km, and the vehicle positioning parameters, chassis key torque, braking performance and tire pressure need to meet the design requirements of the manufacturer.

3. The test method for evaluating vehicle running deviation based on whole vehicle driving according to claim 1, characterized in that: The lower end rear side of the test vehicle (1) is bolted with a mounting plate (4), and a white lime powder hopper (3) is fixedly installed below the mounting plate (4), a manual valve (6) is installed on the lower end outlet side of the white lime powder hopper (3), and the manual valve (6) controls the leakage speed of the white lime powder hopper (3) to lime powder.

4. The test method for evaluating vehicle running deviation based on whole vehicle driving according to claim 1, characterized in that: The total length of the test vehicle (1) during the test is 100m, and the side of the road is marked into three stages, namely 0m, 50m and 100m, 0m is the adjustment position of the test vehicle (1), 50m is the starting evaluation position of the test vehicle (1), and 100m is the end evaluation position of the test vehicle (1).

5. The test method for evaluating vehicle running deviation based on whole vehicle driving according to claim 1, characterized in that: The lower end outlet of the white lime powder hopper (3) is oppositely arranged with the middle axis of the middle part of the road.

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