Multi-chamber Vehicle Airbag with One-way Valve for Oblique Impact Protection
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Solution Overview
Problem
Current airbag designs fail to effectively manage occupant movement and energy absorption during oblique vehicle impacts, leading to high Head Injury Criteria (HIC) values due to inadequate distribution of impact forces across the occupant's body.
Innovation Solution
The airbag assembly includes a U-shaped upper chamber, a torso chamber, a knee chamber, and a head-impact chamber, with a one-way valve allowing the knee chamber to maintain inflation pressure and absorb energy from the occupant's legs, while the upper and torso chambers direct and absorb energy from the occupant's head and torso, and the head-impact chamber deflects the occupant's head towards an uninflatable panel to reduce forward motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-chamber airbag design is used, then the device complexity is low, but the energy absorption capability and occupant protection effectiveness are insufficient during oblique impacts
Solution Approach 1:
The airbag is divided into multiple independent chambers (first chamber, second chamber, third chamber, fourth chamber) with different geometric configurations and inflation characteristics. Each chamber targets specific body regions to distribute impact forces, transforming a single protective element into a multi-functional system that addresses various aspects of occupant protection simultaneously.
Solution Approach 2:
Different chambers are designed with distinct local properties: the first and second chambers have lateral extensions for head/shoulder protection, while the third and fourth chambers have forward extensions for torso protection. Each chamber's geometry, inflation pressure, and material properties are optimized for its specific protective function, allowing the airbag system to provide localized protection where needed most during oblique impacts.
2Loss of energy
If multiple chambers are used to distribute impact forces, then the energy absorption capability improves, but the device complexity increases
Solution Approach 1:
The airbag is segmented into four distinct chambers, each capable of independently absorbing impact energy through controlled deformation. The segmentation allows energy dissipation to occur across multiple zones and time periods, preventing energy concentration in a single location and improving overall energy absorption efficiency while managing structural complexity through modular design.
Solution Approach 2:
Multiple chambers are merged into a single integrated airbag assembly that deploys as one unit from a common inflator. The chambers share common structural elements and inflation pathways, allowing the system to achieve enhanced energy absorption capabilities while minimizing the increase in device complexity through unified design and manufacturing approaches.
3Speed
If the airbag inflates with high pressure to stop occupant motion quickly, then the occupant movement reduction is effective, but the risk of secondary injuries from rapid inflation increases
Solution Approach 1:
The airbag system employs dynamic pressure control where different chambers inflate to different pressures based on real-time impact conditions. The inflation pressure and rate are modulated during the deployment process, allowing the airbag to provide strong initial resistance to rapid occupant motion while then transitioning to a softer, more compliant state that prevents secondary injuries from excessive forces.
Solution Approach 2:
The airbag material and structural parameters are designed to change during inflation and occupation phases. The chambers exhibit non-linear mechanical properties where stiffness increases with compression, providing progressive resistance that adapts to the magnitude and duration of impact forces, thereby controlling occupant motion effectively while avoiding harmful peak forces that could cause secondary injuries.
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
This configuration effectively reduces occupant movement and HIC values by distributing impact forces across multiple body parts, enhancing energy absorption and reducing the risk of head injuries during oblique impacts.
Implementation Method 1
The airbag assembly includes a one-way valve fluidly having a fluid path from the torso chamber to the knee chamber
Implementation Method 2
The knee chamber is supported by and extending below the torso chamber in the inflated position... absorb energy from the occupant's legs
Implementation Method 3
absorb energy from the occupant's head and torso
Data Source
AI summary
An airbag includes a U-shaped chamber, a head-impact chamber, and an uninflatable panel. The U-shaped chamber has a first side leg, a second side leg, and a top extending from the first side leg to the second side leg. The head-impact chamber is disposed between the first side leg and the second side leg. The uninflatable panel extends from the first leg to the second leg adjacent the head-impact chamber.