Four-Wheel Alignment Calibration for Multi-Device Position Accuracy
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Solution Overview
Problem
Existing four-wheel alignment devices lack the ability to accurately determine the positional relationship between different measuring devices, leading to inaccurate measurement of four-wheel alignment parameters due to the use of multiple coordinate systems.
Innovation Solution
A four-wheel alignment method and system that utilizes at least two calibration units, at least one measuring unit, and a calculation unit to fix calibration units to vehicle wheels and measuring units to the same side, collecting images, and calculating four-wheel alignment parameters based on these images to accurately determine the positional relationship between measuring and calibration units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple measuring devices are used to measure four-wheel alignment parameters, then the measurement coverage is improved, but the positional relationship between different measuring devices cannot be determined, resulting in decreased measurement precision
Solution Approach 1:
A calibration unit is introduced as an intermediary between multiple measuring devices to establish their positional relationships. The calibration unit contains calibration points that are detected by different measuring devices, enabling the calculation of relative positions and coordinate transformations between devices, thus resolving the precision issue while maintaining multi-device coverage
Solution Approach 2:
The system transforms measurement parameters by establishing coordinate transformation relationships between different measuring devices based on their detected positions of calibration points. This parameter transformation enables accurate four-wheel alignment measurements by converting measurements from different coordinate systems into a unified reference frame
2Adaptability or versatility
If each measuring device uses a different coordinate system, then the device design flexibility is improved, but the ability to determine positional relationships between devices is worsened, leading to measurement errors
Solution Approach 1:
The system maintains the flexibility of different coordinate systems by introducing coordinate transformation parameters. Through detecting the positions of calibration points in different coordinate systems and calculating transformation relationships, the system reliably determines positional relationships between devices while preserving individual device coordinate system independence
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method and system enable precise determination of the positional relationship, thereby improving the accuracy of four-wheel alignment parameter measurements.
Implementation Method 1
a camera is used to collect a calibration board image
Data Source
Figure 1~2
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Figure 6~7
AI summary
The present application relates to the field of vehicle detection technology, and provides a four-wheel alignment method and a four-wheel alignment system (1). The four-wheel alignment system (1) includes at least two calibration units (20), at least one measuring unit (30), and a computing unit, and the method includes: fixing the at least two calibration units (20) to wheels of the vehicle to be measured, and fixing the at least one measuring unit (30) to a same side of the vehicle to be measured where the at least two calibration units (20) are fixed; respectively collecting, through the at least one measuring unit (30), images of at the least two calibration units (20) to obtain a first image; and receiving the first image through the calculation unit (10), and calculating to obtain four-wheel alignment parameters of the vehicle to be measured based on the first image. The four-wheel alignment method provided in the present application can accurately determine the positional relationship between the measuring unit (30) and the calibration unit (20) through the at least two calibration units (20), the at least one measuring unit (30) and the calculating unit included in the four-wheel alignment system (1), therefore accurate four-wheel alignment parameters of the vehicle to be measured can be obtained, and the measurement accuracy of the four-wheel alignment parameters is improved.