Four-Wheel Alignment Calibration for Unified Coordinate Measurement
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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 inaccuracies in measuring 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 accurately determine the positional relationship between these components, enabling precise measurement of four-wheel alignment parameters by collecting and processing images from multiple cameras and calculating alignment parameters based on these relationships.
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, leading to decreased measurement precision
Solution Approach 1:
A calibration unit is introduced as an intermediary component between multiple measuring devices. The calibration unit includes calibration members with known spatial relationships, allowing each measuring device to capture images of the same calibration target. Through image processing and coordinate transformation based on the known calibration geometry, the positional relationships between different measuring devices are established, enabling accurate four-wheel alignment parameter measurement across the vehicle's wheelbase.
2Adaptability or versatility
If each measuring device uses a different coordinate system, then the adaptability to different measurement positions is improved, but the ability to integrate measurements into a unified system deteriorates
Solution Approach 1:
The patent transforms measurement parameters from different coordinate systems into a unified coordinate system through mathematical coordinate transformation. Each measuring device captures images in its local coordinate system, but the calculation unit performs coordinate transformation using the known positional relationships established through calibration, converting all measurements into a unified vehicle coordinate system. This allows integration of measurements from multiple positions while maintaining coordinate system consistency.
Data Source
AI summary
The present application provides a four-wheel alignment method and a four-wheel alignment system. The four-wheel alignment system includes at least two calibration units, at least one measuring unit, and a computing unit, and the method includes: fixing the at least two calibration units to wheels of the vehicle to be measured, and fixing the at least one measuring unit to a same side of the vehicle to be measured where the at least two calibration units are fixed; respectively collecting, through the at least one measuring unit, images of at the least two calibration units to obtain a first image; and receiving the first image through the calculation unit, and calculating to obtain four-wheel alignment parameters of the vehicle to be measured based on the first image.