Dual-Chamber Airbag Divider Deflection and Vent Control
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Solution Overview
Problem
Current passenger airbag designs face challenges in efficiently managing gas flow and pressure distribution between chambers during deployment, which can affect the protection and safety of vehicle occupants, particularly in scenarios involving out-of-position children.
Innovation Solution
The airbag incorporates a divider that deflects based on pressure differentials to control gas flow through vent openings, using a vent cover system that opens or closes to allow unobstructed gas flow from the upper to the lower chamber or restrict backflow, ensuring optimal pressure distribution and occupant protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the airbag uses a single chamber design, then the structure is simple, but the ability to maintain prolonged inflated pressure for torso support and control deflation is insufficient
Solution Approach 1:
The airbag is divided into an upper chamber and a lower chamber separated by a divider. The lower chamber maintains prolonged inflated pressure to support the vehicle occupant's torso, while the upper chamber can be independently deflated upon head contact. This segmentation allows different duration characteristics in different regions, resolving the contradiction between extended pressure duration and structural simplicity.
2Reliability
If the airbag allows free gas flow between chambers, then the structure is simple, but the ability to maintain pressure differential and control deflation sequence is lost
Solution Approach 1:
The vent cover is configured to dynamically open or close based on the position of the divider. When the divider deflects toward the upper chamber (indicating head contact), the vent cover opens to allow gas flow from the upper chamber. When the divider is in its initial position, the vent cover remains closed to maintain pressure differential. This dynamic control mechanism ensures reliable pressure management while adapting to different occupancy scenarios.
Solution Approach 2:
The vent cover is operatively coupled to the divider such that the divider's own movement triggers the vent cover's opening or closing action. The system uses the divider's position to automatically control gas flow without requiring external sensors or actuators, achieving reliable pressure control through self-service mechanism.
3Object-affected harmful factors
If the vent cover remains closed during deployment, then gas flow is restricted and pressure builds up, but the ability to safely deflate upon head contact is compromised
Solution Approach 1:
The vent cover is automatically controlled by the divider's movement in response to head contact. When the occupant's head contacts the airbag, the divider deflects toward the upper chamber, which automatically triggers the vent cover to open and allow safe deflation. This self-service mechanism eliminates the need for external control systems while effectively reducing head injury risk.
4Adaptability or versatility
If the divider is rigid, then the chamber separation is stable, but the ability to respond to pressure differentials and trigger venting is reduced
Solution Approach 1:
The divider is designed to be deflectable rather than rigid, allowing it to respond to pressure differentials between chambers. When the upper chamber pressure exceeds lower chamber pressure (indicating head contact), the divider deflects toward the upper chamber, triggering the vent cover to open. This dynamic flexibility provides pressure response adaptability while maintaining sufficient structural stability to reliably separate chambers and trigger venting.
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 solution enhances the airbag's ability to maintain prolonged inflated pressure in the lower chamber for torso support and safely deflate the upper chamber upon head contact, improving occupant safety and compliance with safety standards for various occupant positions.
Implementation Method 1
The divider is structured to deflect toward the second chamber when a pressure in the first chamber is greater than a pressure in the second chamber, and is also structured to deflect toward the first chamber when a pressure in the second chamber is greater than a pressure in the first chamber
Implementation Method 2
A vent cover is coupled to the at least one vent opening and to the divider so as to close over and restrict a flow of gas through the at least one vent opening when the divider is deflected in the first direction, and so as to permit the vent cover to open so as to enable an unobstructed flow of gas through the at least one vent opening when the divider is deflected in the second direction
Implementation Method 3
A tether operatively connects the vent cover to the divider such that the vent cover is closed when the divider is deflected toward the second chamber, and such that the vent cover is open when the divider is deflected toward the first chamber
Data Source
AI summary
An airbag includes an outer shell defining an interior, at least one vent opening structured to enable fluid communication between the interior and an exterior of the airbag, and a divider dividing the airbag interior into an upper chamber and a lower chamber. The divider is deflectable in a first direction toward the lower chamber and in a second direction toward the upper chamber. A vent cover is coupled to the at least one vent opening and to the divider so as to close over and restrict a flow of gas through the at least one vent opening when the divider is deflected in the first direction, and so as to permit the vent cover to open so as to enable an unobstructed flow of gas through the at least one vent opening when the divider is deflected in the second direction.