Pedestrian Airbag Layout for Faster A-Pillar and Hood Coverage
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Solution Overview
Problem
Existing pedestrian airbag devices face challenges in deploying large capacity bags efficiently, with delays in the deployment of rearward deployment portions and instability during deployment, leading to potential delays in covering critical vehicle structures like A-pillars and the hood.
Innovation Solution
Incorporating standing deployment portions connected to the fixed and transverse deployment portions of the bag, allowing high-pressure gas to flow preferentially into these portions, ensuring rapid and stable deployment over the A-pillars and hood.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bag capacity is increased to cover more vehicle structures, then the protection coverage is improved, but the deployment time increases and deployment stability deteriorates
Solution Approach 1:
The bag is divided into multiple deployment portions (left rearward deployment portion, right rearward deployment portion, middle transverse deployment portion) with distinct functions. Each portion is connected to inflators through separate pathways, allowing simultaneous deployment across different regions. This segmentation enables the large capacity bag to deploy quickly by distributing the inflation process across multiple parallel channels rather than a single sequential process.
2Area of stationary object
If the bag capacity is increased to cover more vehicle structures, then the protection coverage is improved, but the deployment stability deteriorates
Solution Approach 1:
The bag is divided into multiple deployment portions (left rearward deployment portion, right rearward deployment portion, middle transverse deployment portion) with distinct functions. Each portion is connected to inflators through separate pathways, allowing simultaneous deployment across different regions. This segmentation enables the large capacity bag to deploy quickly by distributing the inflation process across multiple parallel channels rather than a single sequential process.
3Area of stationary object
If the bag capacity is increased to cover more vehicle structures, then the protection coverage is improved, but the deployment speed decreases
Solution Approach 1:
The bag is divided into multiple deployment portions (left rearward deployment portion, right rearward deployment portion, middle transverse deployment portion) with distinct functions. Each portion is connected to inflators through separate pathways, allowing simultaneous deployment across different regions. This segmentation enables the large capacity bag to deploy quickly by distributing the inflation process across multiple parallel channels rather than a single sequential process.
Solution Approach 2:
The patent introduces standing deployment portions that extend vertically above the case, adding a vertical dimension to the deployment structure. This dimensional change allows the bag to achieve comprehensive coverage more rapidly by utilizing three-dimensional expansion rather than purely horizontal or rearward deployment, thereby increasing deployment speed while maintaining extensive coverage area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables rapid and stable deployment of the airbag into a desired U-shape, effectively covering the A-pillars and hood, reducing the risk of direct contact with these structures during collisions.
Implementation Method 1
The left inflator and the right inflator are arranged side by side in the vehicle width direction, and are configured to release high-pressure gas into the bag stored in the case
Data Source
AI summary
A pedestrian airbag device for a vehicle includes a case, a bag, a left inflator, and a right inflator. The bag is stored in the case provided below a hood of the vehicle. The bag is configured to deploy from between the hood and a windshield. The bag has a middle transverse deployment portion that deploys in the vehicle width direction, a left rearward deployment portion connected with the left end of the middle transverse deployment portion, a right rearward deployment portion connected with the right end of the middle transverse deployment portion, and a left standing deployment portion and a right standing deployment portion that are configured to deploy inside the case. The left standing deployment portion is connected with at least the left rearward deployment portion. The right standing deployment portion is connected with at least the right rearward deployment portion.