Door Airbag Segmentation for Convertible Protection
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Solution Overview
Problem
Current airbag systems in vehicles, particularly in convertibles without a fixed roof, face challenges in effectively protecting occupants from secondary impacts with A pillars or windows during collisions, and they often require larger inflators due to the need for side curtain airbags.
Innovation Solution
The implementation of a door assembly with two inflatable airbags, a forward and a rearward airbag, coupled to the door trim panel and in simultaneous fluid communication with an inflator, which are designed to extend and inflate in a manner that prevents secondary impacts and can function without a side curtain airbag, using frangible seams and breakaway panels to optimize space and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a side curtain airbag is used to protect occupants from secondary impacts, then protection effectiveness is improved, but inflator size and system complexity increase
Solution Approach 1:
The airbag system is segmented into two separate airbags (first airbag and second airbag) positioned at different locations within the door assembly. This segmentation allows each airbag to independently provide protection for specific occupancy positions without requiring a single large side curtain airbag, thereby reducing overall system complexity while maintaining protection effectiveness.
Solution Approach 2:
The airbags are configured to deploy in multiple directions (upward and inward) from the door trim panel, utilizing three-dimensional deployment space. This dimensional approach allows compact airbags to provide comprehensive protection coverage that would otherwise require a larger single airbag, reducing inflator size and system complexity.
2Reliability
If a side curtain airbag is used to protect occupants from secondary impacts, then protection effectiveness is improved, but inflator size increases
Solution Approach 1:
The protection function is divided between two smaller airbags instead of one large airbag. Each airbag has its own inflator or shares a common inflator that services both airbags, resulting in smaller individual inflators with reduced volume compared to a single large side curtain airbag inflator.
Solution Approach 2:
The first and second airbags are both serviced by a single common inflator, merging the inflation function into one component. This consolidation reduces the total inflator volume required compared to having separate inflators for each airbag, while still providing effective protection.
3Reliability
If airbags are positioned to extend upward and inward from the door trim panel, then protection coverage is improved, but space requirements increase
Solution Approach 1:
The airbags utilize three-dimensional deployment by extending both upward and inward from the door trim panel simultaneously. This multi-directional deployment maximizes protection coverage within the limited space available in the door assembly, providing comprehensive occupant protection without requiring excessive volume.
Solution Approach 2:
The airbags are constructed as flexible, thin-walled structures that can conform to the available space within the door assembly. This flexibility allows the airbags to extend upward and inward along the contours of the door structure, providing maximum protection coverage within minimal space constraints.
Data Source
AI summary
A door assembly includes a door trim panel, a first airbag coupled to the door trim panel and inflatable to an inflated position, a second airbag coupled to the door trim panel and spaced in a vehicle-rearward direction from the first airbag and inflatable to an inflated position, and an inflator in simultaneous fluid communication with both the first and second airbags when the first and second airbags are in the inflated positions.