CN112798302A - Toe-in adjusting and measuring method for steering wheel of independent suspension - Google Patents
Toe-in adjusting and measuring method for steering wheel of independent suspension Download PDFInfo
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- CN112798302A CN112798302A CN202011613532.4A CN202011613532A CN112798302A CN 112798302 A CN112798302 A CN 112798302A CN 202011613532 A CN202011613532 A CN 202011613532A CN 112798302 A CN112798302 A CN 112798302A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000725 suspension Substances 0.000 title claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 9
- 230000005489 elastic deformation Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M17/06—Steering behaviour; Rolling behaviour
Abstract
The invention discloses a toe-in adjusting and measuring method for an independent suspension steering wheel, which comprises two movable turntables, a wheel clamp, a target disc and a machine vision device, wherein the distance between the two movable turntables corresponds to the distance between vehicle steering wheels.
Description
Technical Field
The invention relates to the technical field of automobile negative film performance testing, in particular to a toe-in adjusting and measuring method for an independent suspension steering wheel.
Background
A heavy special off-road vehicle is a matched chassis of national key equipment. Before the chassis leaves a factory, the toe-in values of the left and right steering wheels need to be respectively adjusted and detected. The running deviation of the vehicle can be caused by the out-of-tolerance of the toe-in value, and the running controllability of the vehicle is reduced; meanwhile, the lateral friction force of the left and right steering wheels can be increased, and the vehicle can slip in rainy and snowy days and on icy roads in serious cases, so that the steering capacity and the braking capacity are lost, and the driving safety of the vehicle is influenced.
The chassis of the heavy special off-road vehicle adopts a Z-shaped high-section frame structure, and the large-diameter wide-section low-pressure off-road tire has good elasticity and is easy to deform. When adjusting the toe-in, the chassis is arranged on the horizontal ground, the toe-in is adjusted by stretching the length of the steering side pull rod, the distance between the front central line and the rear central line of tires of the left steering wheel and the right steering wheel is measured by a measuring tape, and the difference value is used as the toe-in value of the steering wheels of the chassis of the heavy special cross-country vehicle. After each adjustment, the steering wheel needs to be turned 180 degrees for multiple measurements. The process method needs to be adjusted repeatedly, has large measurement error and low efficiency, and has the following problems:
firstly, the precision is low, and measuring error is big. The tolerance of the toe-in value is only 2mm, the minimum division value of the tape measure reaches 1mm, and the distance between the left steering wheel and the right steering wheel is 3.05 m. Due to the fact that the distance is long, certain deflection exists during measurement, the deflection is directly determined by the tensity and is accidental random error, and the measured data portion is accurate. And secondly, when toe-in is adjusted, the wheels are statically placed on the ground, and the steering and swinging of the wheels are in a restrained state. The state of the steering wheel during toe-in adjustment is inconsistent with the chassis running state, the wide-section large-diameter low-pressure off-road tire of the steering wheel has large elastic deformation during toe-in adjustment, and the elastic deformation of the tire causes distortion of a measurement result. The toe-in value is seriously deviated from the design value, and is suddenly large and small, the running deviation and the tire eccentric wear occur at high frequency, and the controllability is poor. .
Disclosure of Invention
Aiming at the technical problems, the invention provides a toe-in adjusting and measuring method for an independent suspension steering wheel, which has the advantages of convenient operation, high accuracy, simple structure, low implementation cost, suitability for adjusting and measuring toe-in values of various vehicle types, and strong universality.
The method for adjusting and measuring the toe-in of the steering wheel of the independent suspension comprises two movable turntables, a wheel clamp, a target disc and a machine vision device, wherein the distance between the two movable turntables corresponds to the distance between the steering wheels of a vehicle, and the method for adjusting and measuring the toe-in of the steering wheel of the independent suspension comprises the following specific steps:
the method comprises the following steps that firstly, toe-in is pre-adjusted, two steering wheels of a vehicle stop on a movable turntable, and toe-in is pre-adjusted by adjusting left and right side pull rods of the steering wheels;
secondly, mounting and debugging test equipment, mounting a wheel clamp on rims of a steering wheel and a rear wheel group of the vehicle, and adjusting a tensioning hand wheel on the wheel clamp to fixedly connect the wheel clamp with the rims; inserting a target disc on the wheel clamp, wherein the central axis of the target disc is in the same straight line with the central axes of the steering wheel and the rear wheel set, the two groups of machine vision devices are respectively arranged at two sides of the vehicle, and the angle of the target disc is adjusted to enable the target disc to enter the identification range of the machine vision device;
thirdly, detecting the toe-in of the steering wheel, starting an engine, rotating the steering wheel to keep neutral, rotating the steering wheel to the left to a certain angle, keeping for a period of time, then rotating the steering wheel to a certain angle to the right, keeping for a period of time, then restoring the steering wheel to the neutral position, and calculating the toe-in value of the steering wheel by the machine vision device by capturing the angle of a target disc;
fourthly, checking a toe-in value, and finishing toe-in adjustment of the steering wheel if the toe-in value detected in the third step meets the requirement; and if the toe-in value detected in the third step does not meet the requirement, adjusting the length of the lateral pull rod of the steering wheel again, adjusting the toe-in of the steering wheel, and repeating the third step until the detected toe-in value meets the requirement.
Preferably, as above-mentioned technical scheme, the activity carousel includes base, carousel and ball, the carousel lock joint is on the base, the ball is located on the base for support carousel, the diameter of carousel is greater than the diameter of base, can laterally move one end distance on the base.
Preferably, the balls are provided with a plurality of circles and are uniformly distributed along the radial direction of the base.
Preferably, the target disc is provided with black and white blocks, so that the machine vision device can conveniently identify the blocks.
The invention has the beneficial effects that:
1. the toe-in adjustment realizes on-line real-time measurement, the vehicle steering wheel which cancels the design requirement needs to rotate 180 degrees, and the operation is simpler and more convenient.
2. Non-contact measurement is realized, and the measurement is more efficient.
3. The device has strong universality and is suitable for adjusting and measuring the toe-in of the steering wheel of various chassis.
4. The compatibility is good, and the device can also be suitable for measuring steering wheel parameters such as the camber angle of the steering wheel, the inner inclination angle of the kingpin and the like.
5. The test safety is high. The visible light is adopted for measurement, and laser is not emitted and reflected, so that the eye of a human body is not damaged.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic structural view of the movable turntable.
Fig. 3 is a schematic view of a target disk structure.
The reference numbers are as follows: 1-movable turntable, 101-base, 102-turntable, 103-rolling ball, 2-wheel clamp, 3-target disc, 4-machine vision device, 5-steering wheel and 6-rear wheel group.
Detailed Description
The technical scheme of the invention is clearly and completely described below by combining the attached drawings of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
As shown in fig. 1 to 3, the method for adjusting and measuring toe-in of an independent suspension steered wheel comprises two movable turntables 1, a wheel clamp 2, a target disc 3 and a machine vision device 4, wherein the distance between the two movable turntables 1 corresponds to the distance between the steered wheels 5 of a vehicle, and the method for adjusting and measuring toe-in of an independent suspension steered wheel comprises the following specific steps:
firstly, pre-adjusting toe-in, stopping two steering wheels 5 of a vehicle on a movable turntable 1, and pre-adjusting toe-in by adjusting left and right side pull rods of the steering wheels 5;
secondly, mounting and debugging test equipment, mounting the wheel clamp 2 on rims of a vehicle steering wheel 5 and a rear wheel group 6, and adjusting a tensioning hand wheel on the wheel clamp 2 to fixedly connect the wheel clamp 2 with the rims; inserting a target disc 3 on the wheel clamp 2, wherein the central axis of the target disc 3 is in the same straight line with the central axes of the steering wheel 5 and the rear wheel group 6, and the two groups of machine vision devices 4 are respectively arranged at two sides of the vehicle, and adjusting the angle of the target disc 3 to enable the target disc 3 to enter the identification range of the machine vision device 4;
thirdly, detecting the toe-in of the steering wheel 5, starting an engine, rotating the steering wheel 5 to keep neutral, rotating the steering wheel 5 to the left to a certain angle, keeping for a period of time, then rotating the steering wheel 5 to a certain angle to the right, keeping for a period of time, then restoring the steering wheel 5 to the neutral position, and calculating the toe-in value of the steering wheel 5 by the machine vision device 4 by capturing the angle of the target disc 3; the target plate 3 on the rear wheel set 6 can be used as a reference object, and the target plate 3 can be arranged in the middle of the vehicle.
Fourthly, checking the toe-in value, and finishing toe-in adjustment of the steering wheel 5 if the toe-in value detected in the third step meets the requirement; and if the toe-in value detected in the third step does not meet the requirement, adjusting the length of the lateral pull rod of the steering wheel 5 again, adjusting the toe-in of the steering wheel 5, and repeating the third step until the detected toe-in value meets the requirement.
In this embodiment, the movable turntable 1 includes a base 101, a turntable 102, and a ball 103, the turntable 102 is fastened to the base 101, the ball 103 is disposed on the base 101 and is used for supporting the turntable 102, and the diameter of the turntable 102 is larger than that of the base 101 and can move a distance laterally on the base 101.
In this embodiment, the balls 104 are provided with a plurality of turns, and are uniformly distributed along the radial direction of the base 101.
In this embodiment, black and white squares are provided on the target disk 3 for the machine vision device to recognize.
The specific working principle of this embodiment is as follows.
In the embodiment, the machine vision device 4 is the prior art, the camera of the machine vision device 4 shoots the target disk 3 in real time, the image of the camera is transmitted to the PC end according to the TCP/IP protocol, the received image is processed by the special software, and the target disk 3 is identified from the frame image. The dedicated software calculates the three-dimensional coordinates of the target disc 3 using the V3D algorithm, from which the toe angle of the steered wheels 5 is to be calculated.
According to the scheme, the steering wheel is used for simulating the running state of the wheel to replace the original ground constraint state, the movable turntable 1 is used for supporting the vehicle steering wheel 5, the running state of the steering wheel 5 is simulated, the friction force between the steering wheel 5 and the ground when the steering wheel 5 rotates is basically eliminated, and the phenomenon that the toe-in value data is distorted due to the fact that the tire elastic deformation is generated by the huge friction force between the steering wheel 5 and the ground when the toe-in is adjusted is avoided.
The movable turntable 1 adopts a non-centering structure, can automatically adjust and align the rotation center of the steering wheel 5 and the rotation center of the turntable 102, eliminates the requirement of precise positioning of the rotation center of the steering wheel 5 and the rotation center of the turntable 102, eliminates the elastic deformation of the tire caused by the lateral force of the tire due to the misalignment of the rotation center of the steering wheel 5 and the rotation center of the turntable 102, and eliminates the lateral force during the toe-in adjustment of the steering wheel.
A plurality of high-reflection black and white alternating squares are arranged on the target disc 3, and the machine vision device 4 can easily identify and iteratively calculate the three-dimensional space position of the target, so that the measurement precision of the three-dimensional space position of the target disc 3 is improved;
and adjusting the toe-in value of the steering wheel 5 by continuously adjusting the length of the side pull rod of the steering wheel 5, repeating the third step of the toe-in adjustment and measurement method of the steering wheel of the independent suspension after each adjustment, and retesting the toe-in value until the tested toe-in value meets the requirement, namely explaining that the toe-in of the steering wheel 5 is adjusted in place.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A toe-in adjusting and measuring method for an independent suspension steering wheel is characterized by comprising the following steps: the method comprises two movable turntables, a wheel clamp, a target disc and a machine vision device, wherein the distance between the two movable turntables corresponds to the distance between the steering wheels of the vehicle, and the method for adjusting and measuring the toe-in of the steering wheels of the independent suspension comprises the following specific steps:
the method comprises the following steps that firstly, toe-in is pre-adjusted, two steering wheels of a vehicle stop on a movable turntable, and toe-in is pre-adjusted by adjusting left and right side pull rods of the steering wheels;
secondly, mounting and debugging test equipment, mounting a wheel clamp on rims of a steering wheel and a rear wheel group of the vehicle, and adjusting a tensioning hand wheel on the wheel clamp to fixedly connect the wheel clamp with the rims; inserting a target disc on the wheel clamp, wherein the central axis of the target disc is in the same straight line with the central axes of the steering wheel and the rear wheel set, the two groups of machine vision devices are respectively arranged at two sides of the vehicle, and the angle of the target disc is adjusted to enable the target disc to enter the identification range of the machine vision device;
thirdly, detecting the toe-in of the steering wheel, starting an engine, rotating the steering wheel to keep neutral, rotating the steering wheel to the left to a certain angle, keeping for a period of time, then rotating the steering wheel to a certain angle to the right, keeping for a period of time, then restoring the steering wheel to the neutral position, and calculating the toe-in value of the steering wheel by the machine vision device by capturing the angle of a target disc;
fourthly, checking a toe-in value, and finishing toe-in adjustment of the steering wheel if the toe-in value detected in the third step meets the requirement; and if the toe-in value detected in the third step does not meet the requirement, adjusting the length of the lateral pull rod of the steering wheel again, adjusting the toe-in of the steering wheel, and repeating the third step until the detected toe-in value meets the requirement.
2. The method for adjusting and measuring toe of an independently steered wheel of claim 1, wherein: the movable turntable comprises a base, a turntable and balls, the turntable is buckled on the base, the balls are arranged on the base and used for supporting the turntable, the diameter of the turntable is larger than that of the base, and one end distance can be laterally moved on the base.
3. The method of adjusting and measuring toe-in of an independently steered wheel of claim 2, wherein: the ball is equipped with many rings, along the radial evenly distributed of base.
4. The method for adjusting and measuring toe of an independently steered wheel of claim 1, wherein: and black and white square blocks are arranged on the target disc, so that the machine vision device can conveniently identify the square blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011613532.4A CN112798302A (en) | 2020-12-30 | 2020-12-30 | Toe-in adjusting and measuring method for steering wheel of independent suspension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011613532.4A CN112798302A (en) | 2020-12-30 | 2020-12-30 | Toe-in adjusting and measuring method for steering wheel of independent suspension |
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| CN112798302A true CN112798302A (en) | 2021-05-14 |
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| CN202011613532.4A Pending CN112798302A (en) | 2020-12-30 | 2020-12-30 | Toe-in adjusting and measuring method for steering wheel of independent suspension |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1443298A (en) * | 2000-06-28 | 2003-09-17 | 捷装技术公司 | Target system for use with position determination system |
| CN101469983A (en) * | 2007-12-28 | 2009-07-01 | 上海通运汽车科技有限公司 | Method and device for detecting vehicle front wheel angle |
| CN201697790U (en) * | 2010-06-24 | 2011-01-05 | 深圳市安车检测技术有限公司 | Toe-in platform measuring system |
| KR101286096B1 (en) * | 2013-02-01 | 2013-07-15 | 조이엠(주) | An examination method of vehicle wheel alignment based on oval vision characteristic |
| CN108020133A (en) * | 2017-12-21 | 2018-05-11 | 力帆实业(集团)股份有限公司 | Toe-in of automobile fine range measurement adjusting apparatus and method |
| CN108152049A (en) * | 2017-12-21 | 2018-06-12 | 力帆实业(集团)股份有限公司 | Toe-in of automobile detects method of adjustment |
| CN111220399A (en) * | 2019-12-31 | 2020-06-02 | 的卢技术有限公司 | Method and system for measuring toe angle of wheel based on image |
-
2020
- 2020-12-30 CN CN202011613532.4A patent/CN112798302A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1443298A (en) * | 2000-06-28 | 2003-09-17 | 捷装技术公司 | Target system for use with position determination system |
| CN101469983A (en) * | 2007-12-28 | 2009-07-01 | 上海通运汽车科技有限公司 | Method and device for detecting vehicle front wheel angle |
| CN201697790U (en) * | 2010-06-24 | 2011-01-05 | 深圳市安车检测技术有限公司 | Toe-in platform measuring system |
| KR101286096B1 (en) * | 2013-02-01 | 2013-07-15 | 조이엠(주) | An examination method of vehicle wheel alignment based on oval vision characteristic |
| CN108020133A (en) * | 2017-12-21 | 2018-05-11 | 力帆实业(集团)股份有限公司 | Toe-in of automobile fine range measurement adjusting apparatus and method |
| CN108152049A (en) * | 2017-12-21 | 2018-06-12 | 力帆实业(集团)股份有限公司 | Toe-in of automobile detects method of adjustment |
| CN111220399A (en) * | 2019-12-31 | 2020-06-02 | 的卢技术有限公司 | Method and system for measuring toe angle of wheel based on image |
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Application publication date: 20210514 |