Airbag Lug Coded Weaving for Mounting Detection

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Solution Overview

Problem

Existing airbag mounting systems face issues with incorrect installation due to multiple attachment points, leading to potential failure in inflation during crashes, and existing marking solutions are not effectively visible after the rolling or folding process, increasing manufacturing costs and complexity.

Innovation Solution

Integration of a coded weaving structure with differently colored warp and weft threads in the airbag fabric, forming a two-dimensional barcode that is visible from both sides and remains accessible after rolling or folding, allowing for accurate detection of correct attachment without additional assembly steps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a separate indicator is provided on the airbag to indicate mounting orientation, then the mounting correctness can be detected, but the manufacturing complexity and assembly steps increase

Engineering Contradiction:

Improvemounting detection accuracyVSAvoidmanufacturing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The marking is integrated directly into the lug fabric structure rather than being a separate component. The coded weaving pattern is woven into the lug material itself, eliminating the need for separate indicators and reducing assembly steps while maintaining mounting detection capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The lug serves dual functions: it provides the mechanical attachment function and simultaneously displays the mounting orientation marking through its coded weaving structure. This multi-functionality eliminates the need for separate indicator components

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If markings are provided on the airbag fabric to indicate mounting orientation, then the mounting correctness can be detected, but the markings may not be visible after rolling or folding

Engineering Contradiction:

Improvemounting detection accuracyVSAvoidmarking accessibility

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The marking is placed specifically on the lug portion of the airbag, which has different mechanical behavior during rolling/folding compared to the main airbag body. The lug's local positioning ensures the marking remains accessible for detection while the airbag is installed

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If traditional markings are used on the airbag, then manufacturing is simple, but the markings cannot provide unambiguous detection of correct attachment

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidattachment detection accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The marking system transitions from simple linear patterns to a two-dimensional coded weaving structure. This dimensional enhancement allows for more information to be encoded in the marking, enabling unambiguous detection of correct attachment orientation while maintaining integration into the fabric manufacturing process

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS8770622B2Airbag for a vehicle

Publication Date: 2014.07.08 AUTOLIV DEV AB

AI summary

An airbag for a vehicle comprising an inflatable portion and lugs arranged at the periphery of the inflatable portion. The airbag is made of a one-piece-woven technology having a structure made of warp threads and weft threads. The airbag further comprises a marking for enabling a detection of an incorrect attachment of the airbag at the vehicle. The marking is realized by a coded weaving structure in at least one lug.