Optical Chassis Measurement Without Surface Marks
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Solution Overview
Problem
Existing optical chassis measurement methods require significant effort to affix and adapt detectable marks on the vehicle wheel and chassis for precise measurements, limiting their efficiency and practicality.
Innovation Solution
A method using a laser beam to scan the surface structure of the vehicle's chassis and wheel, acquiring three-dimensional surface profiles to determine spatial positions of characteristic points without the need for marks, employing polar coordinates and powerful processors for precise evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If marks are affixed to the wheel and chassis for detection, then measurement precision is improved, but the effort and complexity of preparation increase
Solution Approach 1:
The measurement system utilizes the vehicle's own surface structures (wheel rim edge, chassis opening contours) as measurement features, eliminating the need for external marks. The existing geometric features of the vehicle components serve the dual purpose of structural function and measurement reference, requiring no additional preparation work while maintaining measurement precision
Solution Approach 2:
The invention extracts and utilizes the inherently present geometric features of the wheel and chassis components as measurement markers. By focusing detection on existing structural elements like the wheel rim edge and chassis opening contours, the system removes the need for artificial mark affixation while maintaining reliable measurement capability
2Reliability
If marks are affixed to the wheel and chassis, then reliable detection is improved, but operation complexity increases
Solution Approach 1:
The vehicle components themselves provide the detection features through their inherent geometry. The wheel rim edge and chassis opening contours serve as self-contained reference features that require no external marking, simplifying operation while ensuring reliable detection through the use of stable, inherent geometric properties
Solution Approach 2:
Instead of adding external marks to create detection features, the system inverts the approach by directly detecting the natural geometric features of the vehicle components. This reversal eliminates the marking step entirely and reduces operational complexity while maintaining detection reliability
3Device complexity
If ambient light is used for feature detection, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
A laser beam serves as an intermediary illumination source that projects structured light patterns onto the wheel and chassis surfaces. This controlled light source enhances the contrast and definition of surface features for the sensor system, improving measurement precision while maintaining relatively simple device architecture through the use of standard laser components
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 simplifies the measurement process by eliminating the need for mark adaptation, providing precise and reliable results with reduced effort, and allowing for real-time data acquisition during vehicle movement, including wheel load and geometry analysis.
Implementation Method 1
radiation reflected against a surface structure of a vehicle, including at least one wheel and a chassis opening surrounding it, is detected by a measuring device by means of a corresponding sensor system
Implementation Method 2
the distance measurement is carried out for each matrix element in accordance with the nrincinle of a travel time measurement and/or phase difference measurement
Implementation Method 3
the distance measurement is carried out for each matrix element in accordance with the nrincinle of a travel time measurement and/or phase difference measurement
Data Source
AI summary
The invention relates to a method for optically measuring a chassis at a testing station. According to said method, radiation that is reflected by a surface structure of a vehicle, comprising at least one wheel (5) and a surrounding bodywork section, is detected by a measuring device with the aid of appropriate sensors, and at least the wheel plane and the wheel center point are determined by an evaluation of the positional data obtained by means of the detected radiation. To achieve a reliable, precise measurement of the chassis in a simple operation, the surface structure of at least the vehicle bodywork section and at least the wheel is scanned, over its entire surface or at least by any two lines that record both the wheel and the bodywork, using a laser beam (12) that is emitted by the measuring device (10), and at least two surface profiles are obtained from the scanned surface structure as characteristic structures.