Optical Rolling Radius Measurement Without Wheel Marks
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Solution Overview
Problem
Existing methods for determining the rolling radius of a vehicle wheel require mounting marks on the wheel and road surface, which is time-consuming and prone to errors, and may cause damage to the wheel rims.
Innovation Solution
A method and device that project a light pattern onto the wheel and road surface, record and analyze the reflected light pattern to determine the wheel's rotation center and road surface position, allowing for the calculation of the rolling radius without the need for marks, enabling accurate measurement even on a moving vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If marks are mounted on the wheel and road surface for determining rolling radius, then measurement precision is improved, but time consumption increases and wheel rim damage may occur
Solution Approach 1:
The patent replaces the mechanical marking system with an optical measurement system. Instead of mounting physical marks on the wheel and road surface, the system uses a camera to capture the wheel's motion and calculates the rolling radius through image processing and geometric analysis of the wheel's position and orientation changes over time.
Solution Approach 2:
The patent creates an optical copy or digital representation of the wheel's motion rather than using physical marks. The camera captures the wheel's position, orientation, and motion轨迹, and this digital information is processed to determine the rolling radius, eliminating the need for physical marks on the wheel and road surface.
2Measurement precision
If marks are mounted on the wheel and road surface, then measurement precision is improved, but the complexity of the measurement setup increases
Solution Approach 1:
The patent replaces the mechanical marking system with an optical measurement system. Instead of mounting physical marks on the wheel and road surface, the system uses a camera to capture the wheel's motion and calculates the rolling radius through image processing and geometric analysis of the wheel's position and orientation changes over time.
Solution Approach 2:
The patent extracts the essential measurement function from the physical marking system. Instead of relying on marks to provide measurement references, the system extracts geometric information directly from the wheel's motion characteristics captured by the camera, eliminating the need for separate marking components.
3Measurement precision
If marks are mounted on the wheel, then measurement precision is improved, but the risk of wheel rim damage increases
Solution Approach 1:
The patent replaces the mechanical marking system with an optical measurement system. Instead of mounting physical marks on the wheel and road surface, the system uses a camera to capture the wheel's motion and calculates the rolling radius through image processing and geometric analysis of the wheel's position and orientation changes over time.
Solution Approach 2:
The patent creates an optical copy or digital representation of the wheel's motion rather than using physical marks. The camera captures the wheel's position, orientation, and motion trajectory, and this digital information is processed to determine the rolling radius, eliminating the need for physical marks on the wheel and road surface.
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
This approach eliminates the need for marks, reduces error susceptibility, and allows for real-time measurement of rolling radius, enabling optimized wheel alignment and detection of road surface irregularities, unequal tire pressure, and wear, while providing error correction suggestions.
Implementation Method 1
projecting a light pattern onto the wheel and the road surface; recording a light pattern reflected by the wheel and the road surface
Data Source
AI summary
A method for determining the rolling radius of a wheel, of a motor vehicle on a road surface, including: projecting a light pattern onto the wheel and road surface; recording a light pattern reflected by the wheel and road surface using an image recording device; determining 3D coordinates of points of the reflected light pattern; identifying points of the reflected light pattern of the wheel; identifying points of the reflected light pattern of the road surface; determining the position of the center of rotation of the wheel from the reflected light pattern points identified as belonging to the wheel; determining the position of the road surface from the reflected light pattern points identified as belonging to the road surface; determining the rolling radius on the contact surface of the wheel as the distance between the center of rotation of the wheel and the position of the road surface.