Dual A-Pillar Truss for Autonomous Vehicle Roof Crush Dissipation
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Solution Overview
Problem
Conventional vehicle frames with a single A-pillar are inadequate in dissipating roof crush loads efficiently, leading to excessive displacement during rollover crashes, especially when seating configurations change, such as in autonomous vehicles with rearward-facing front seats.
Innovation Solution
The implementation of a dual A-pillar beam structure, where the first A-pillar spans between the roof rail and shotgun, and a second A-pillar spans between the roof rail and hinge pillar, forming a closed structural truss without a B-pillar, to redefine the side ingress/egress opening and distribute loads more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single A-pillar structure is used in conventional vehicles, then the structure is simple and easy to manufacture, but it is inadequate in dissipating roof crush loads efficiently, leading to excessive displacement during rollover crashes
Solution Approach 1:
The single A-pillar is segmented into two separate A-pillars (first A-pillar and second A-pillar) that work together to form a truss structure. This segmentation allows each pillar to bear specific portions of the roof crush load, improving overall load dissipation efficiency while maintaining structural integrity during rollover crashes
Solution Approach 2:
The patent introduces a spatial truss configuration by positioning the two A-pillars at different angles relative to the roof rail and shotgun/hinge pillar. This dimensional arrangement creates a three-dimensional load path that more effectively dissipates roof crush loads compared to a single planar A-pillar structure
2Reliability
If the seating configuration is changed to rearward-facing front seats in autonomous vehicles, then passenger safety and comfort are improved, but the structural requirements for load dissipation change, making conventional single A-pillar structures inadequate
Solution Approach 1:
The dual A-pillar truss structure serves multiple functions: it provides the necessary load dissipation path for autonomous vehicle configurations with rearward-facing seats, maintains structural integrity for passenger safety, and creates the geometric configuration needed for side ingress/egress openings. This multi-functional design accommodates various seating arrangements while ensuring safety
3Strength
If a closed structural truss is formed using first A-pillar, second A-pillar, hinge pillar, and shotgun, then load distribution is improved, but the manufacturing and assembly complexity increases
Solution Approach 1:
The first and second A-pillars are designed with pre-configured geometric relationships and connection points that facilitate assembly into a predetermined truss configuration. The pillars are shaped and positioned in advance to align with the shotgun and hinge pillar, simplifying the assembly process despite the increased structural complexity
Data Source
AI summary
A vehicle is provided. The vehicle may include a first A-pillar, spanning between a roof rail and shotgun, and a frame assembly. The first A-pillar may carry a windshield. The frame assembly may include a second A-pillar, spanning between the roof rail and a hinge pillar, and a C-pillar. The frame assembly may define a side ingress/egress opening of a cabin having a rearward-facing front seat. The opening may span between the second A-pillar and C-pillar without a B-pillar.