ADAS Calibration Alignment Using Wheel Targets and Fewer Cameras
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Solution Overview
Problem
Existing vehicle service systems require a large number of cameras or cameras with wide fields of view to align wheels and calibrate ADAS sensors, leading to high costs and complexity.
Innovation Solution
A method and system that use a calibration structure with a movable panel and optical devices to capture specific image data of wheel targets and structure targets using a limited number of cameras with adjustable fields of view, allowing for precise alignment with reduced costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of cameras are used to capture image data of wheel targets and calibration structure targets, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent divides the measurement process into two sequential stages: first capturing wheel target image data, then capturing calibration structure target image data. This segmentation allows a single camera to perform multiple measurement functions at different times, eliminating the need for multiple simultaneous cameras while maintaining measurement precision.
Solution Approach 2:
The patent positions the calibration structure at a predetermined location before alignment measurement begins. The calibration structure includes pre-positioned targets that will be captured in the field of view during the measurement process, eliminating the need for additional cameras to track calibration elements.
2Measurement precision
If cameras with wide fields of view are used to capture all targets, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs a movable calibration structure that can be dynamically positioned to ensure its targets remain within the camera's field of view during measurement. This dynamic positioning allows the use of cameras with narrower fields of view while still achieving accurate target capture and measurement.
3Measurement precision
If multiple cameras are used to capture both wheel targets and calibration structure targets simultaneously, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent designs a single camera system that performs multiple functions: capturing wheel target image data for alignment measurement and capturing calibration structure target image data for calibration. This multi-functionality eliminates the need for separate camera systems, simplifying operation while maintaining measurement and calibration accuracy.
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
Enables precise alignment of vehicle service systems with fewer cameras, improving constructional simplicity and reducing costs while maintaining accuracy in calibrating ADAS sensors.
Implementation Method 1
an optical device for capturing first image data and second image data
Data Source
AI summary
A method is provided for aligning a vehicle service system relative to a vehicle positioned in a service area and provided with an Advanced Driver Assistance System, ADAS. The vehicle service system includes: a calibration structure, for calibrating an ADAS sensor of the ADAS of the vehicle, and an apparatus for measuring the alignment of the vehicle, wherein an optical device for capturing images is mounted on the apparatus. The method includes the following steps: applying a front wheel target and a rear wheel target on a front wheel and on a rear wheel of the vehicle; positioning the calibration structure and the apparatus at a position in front of the vehicle; capturing images through the optical device; and processing the images to derive information useful for positioning the calibration structure relative to the vehicle.