Multi-chamber Driver Airbag with One-way Valve Pressure Control
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Solution Overview
Problem
Conventional driver airbags may not provide optimal protection in collision scenarios, particularly in small overlap frontal crashes, due to inadequate positioning and cushioning, and often have uneven inflation patterns that can compromise their effectiveness.
Innovation Solution
The airbag assembly features a base chamber that deploys quickly and maintains higher pressure than the cushioning chamber, utilizing one-way valves to control gas flow and ensure the base chamber remains pressurized, providing superior positioning and stabilization by interacting with the steering wheel to prevent injurious contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-chamber airbag is used, then the structure is simple, but the positioning and cushioning effectiveness is insufficient in collision scenarios
Solution Approach 1:
The airbag is divided into multiple chambers (first chamber and second chamber) with different functions. The first chamber provides rapid deployment and steering wheel interaction, while the second chamber provides occupant cushioning. This segmentation allows each chamber to be optimized for its specific function, improving overall reliability without requiring a completely complex new structure.
Solution Approach 2:
The patent implements dynamic pressure control where the first chamber maintains higher pressure than the second chamber during deployment. This dynamic pressure differential enables the first chamber to effectively interact with the steering wheel for positioning while the second chamber expands to cushion the occupant, adapting the airbag's mechanical properties to different collision phases.
2Reliability
If the airbag deploys with uniform pressure, then the inflation is straightforward, but the positioning and stabilization capability is compromised
Solution Approach 1:
Different chambers are assigned different pressure qualities - the first chamber operates at higher pressure for positioning and stabilization, while the second chamber operates at lower pressure for cushioning. This local differentiation of pressure quality allows each region of the airbag to perform its specific function optimally.
Solution Approach 2:
The first chamber is designed to inflate rapidly first, establishing the airbag's position and stabilization before the second chamber fully deploys. This preliminary action ensures proper positioning is achieved before the main cushioning function activates, optimizing the sequence of protective actions.
3Duration of action of moving object
If the base chamber deflates quickly, then the airbag reduces rapidly, but the positioning and support function is lost
Solution Approach 1:
The segmented chamber design allows the first chamber to maintain pressure longer than the second chamber. This differential duration ensures that the positioning and support function (first chamber) persists longer than the cushioning function (second chamber), matching the temporal requirements of different protective phases.
Solution Approach 2:
The patent controls the pressure parameter differently for each chamber over time. The first chamber maintains higher pressure for a longer duration to sustain positioning and support, while the second chamber pressure decreases more rapidly after initial deployment. This temporal parameter differentiation optimizes the duration of each function.
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 enhances the airbag's ability to maintain effective positioning and cushioning during deployments, providing improved protection for occupants by ensuring the base chamber remains pressurized and stabilizes the airbag, thus preventing contact with the steering wheel in various collision scenarios.
Implementation Method 1
the base chamber is configured to maintain a pressure that is higher than a pressure within the cushioning chamber
Implementation Method 2
A base chamber is provided that is configured to deploy more quickly than the cushioning chamber
Data Source
AI summary
A driver airbag can be deployed from a steering wheel of a vehicle. The airbag can include a first inflatable chamber and a second inflatable chamber that can be deployed adjacent to the first inflatable chamber. The airbag can further include a one-way valve that controls inflation gas movement relative to at least the first inflatable chamber.