Automated Vision Inspection of Side Curtain Airbag Assemblies
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automated vision inspection systems for side curtain airbags face challenges in accurately detecting twisted installations due to the flexible nature of the airbag, leading to false detections and increased manufacturing costs and weight from additional hardware designed to prevent twists.
Innovation Solution
The implementation of a plurality of polygonal-shaped pixel markings on the side curtain airbag or its sock, allowing the inspection system to determine marking orientation and presence, with unique indicia that can be compared to master images to assess the installation condition, reducing false detections and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional markings (barcodes, writing, stripes) are used on the side curtain airbag assembly, then the human eye can detect twists more easily, but automated vision inspection systems produce false detections due to misinterpretation of features
Solution Approach 1:
The marking is divided into multiple discrete geometric shapes (triangles, squares, circles, etc.) arranged in a specific pattern along the longitudinal axis. Each shape serves as an independent detectable feature, allowing the automated vision system to accurately determine orientation and position without misinterpretation, while still providing visual guidance for twist detection.
Solution Approach 2:
The marking uses asymmetric geometric shapes with distinct orientations (e.g., triangles pointing in specific directions, non-circular shapes) that create unique visual patterns. This asymmetry enables both human operators to easily detect twists and automated vision systems to accurately identify marking orientation without confusion from symmetric features.
2Reliability
If additional hardware is added to prevent 360 degree twists, then proper installation is ensured, but weight and cost of the side curtain airbag increase
Solution Approach 1:
The patent replaces mechanical prevention hardware with a visual marking system that provides installation guidance. The geometric shape marking allows operators and automated systems to detect twists without requiring additional mechanical components, thereby maintaining reliability while eliminating the weight and cost of preventive hardware.
3Ease of manufacture
If the side curtain airbag assembly is made flexible to reduce installation complexity, then ease of installation improves, but the risk of twisted installation increases
Solution Approach 1:
The geometric shape marking acts as an intermediary between the flexible airbag assembly and the installation verification process. The marking provides a clear visual reference that mediates the detection of twists, allowing the flexible assembly to maintain ease of installation while ensuring installation correctness through the detectable marking pattern.
Data Source
AI summary
A side curtain airbag assembly includes an inflatable cushion and a sock for housing the cushion in a folded state. At least one of the cushion and sock includes a plurality of spaced markings arrayed along its respective longitudinal extent. Each marking is defined by at least two indicia including a first indicium and a second indicium. Each of the first indicium and second indicium is formed from a plurality of similarly shaped and sized interconnected pixels which together provide for first and second indicia having a predetermined height and width.