B-pillar deformation mode for side impact protection
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Solution Overview
Problem
In vehicles with B-pillars that rely on a continuous roof rail for load transfer during side impacts, the bending mode often results in B-pillar intrusion into the passenger compartment, compromising the effectiveness of airbag deployment.
Innovation Solution
A vehicle structure without a continuous roof rail, featuring a B-pillar with initiators that provide a deformation mode upon side impact, including a header attached to the B-pillar and extending across the vehicle, configured to maintain an angle and preserve space for airbag deployment, with reinforcement between the B-pillar and header to reduce deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the B-pillar relies on a continuous roof rail for load transfer during side impacts, then the load transfer capability is improved, but the B-pillar intrusion into the passenger compartment increases
Solution Approach 1:
The patent divides the roof structure into discrete segments (roof rails) rather than using a continuous roof rail. The B-pillar is connected to individual roof rail segments at specific attachment points, allowing controlled deformation while maintaining load transfer capability through the segmented structure.
Solution Approach 2:
The patent modifies the structural parameters of the B-pillar by adding initiators (weakening features) at specific locations. These initiators change the deformation characteristics of the B-pillar, enabling it to deform in a controlled manner that reduces intrusion while maintaining overall strength.
2Device complexity
If the B-pillar uses a bending mode for load transfer, then the load transfer path is simplified, but the airbag deployment effectiveness is reduced
Solution Approach 1:
The patent incorporates initiators (pre-formed weakening features) into the B-pillar structure during manufacturing. These initiators are positioned to control the deformation pattern during side impacts, ensuring that the B-pillar deforms in a predetermined manner that preserves airbag deployment space while maintaining load transfer capability.
3Strength
If the B-pillar is designed with high stiffness to prevent intrusion, then the occupant protection is improved, but the airbag deployment space is reduced
Solution Approach 1:
The patent applies different structural properties to different parts of the B-pillar. The initiators create localized regions of controlled deformation, while the rest of the B-pillar maintains high stiffness for overall structural integrity and occupant protection.
4Stability of the object's composition
If the B-pillar uses a continuous roof rail structure, then the structural integrity is improved, but the deformation control capability is reduced
Solution Approach 1:
The patent segments the continuous roof rail structure into discrete sections with defined attachment points to the B-pillar. This segmentation allows the B-pillar to deform independently in a controlled manner while the roof rail segments maintain overall structural integrity through their own strength and connection points.
Data Source
AI summary
A vehicle comprises: a vehicle structure without a continuous roof rail; a B-pillar attached to the vehicle structure, the B-pillar having a first initiator; and a header attached to the B-pillar and extending at least partly across the vehicle, the header having a second initiator, wherein the first and second initiators are configured to provide a B-pillar deformation mode upon side impact.