Dual Chamber Airbag Valve Flap Backflow Control
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Solution Overview
Problem
Existing airbag systems face challenges in controlling gas flow between chambers to maintain pressure and prevent backflow, which affects the duration and efficiency of passenger cushioning during impact.
Innovation Solution
A valve mechanism with a flap is integrated into the airbag divider, allowing gas flow from a higher pressure chamber to a lower pressure chamber while blocking backflow by deflecting and overlapping non-attachment edges to maintain a gas-tight seal, optimizing gas flow rates and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve mechanism with flap is used to control gas flow between chambers, then backflow prevention is improved, but device complexity increases
Solution Approach 1:
The flap valve operates automatically based on pressure differential between chambers without external control. When pressure in the second chamber exceeds pressure in the first chamber, the flap deflects to block the opening and prevent backflow. This self-actuating mechanism eliminates the need for complex control systems while maintaining reliable backflow prevention.
Solution Approach 2:
The valve mechanism uses a flexible flap that deflects in response to pressure differential. This thin film approach simplifies the valve structure compared to rigid mechanical valves, reducing overall device complexity while maintaining effective backflow prevention through the flap's ability to seal against the opening.
2Stress or pressure
If the flap is positioned to block the opening for backflow prevention, then pressure maintenance in the second chamber is improved, but gas flow rate into the second chamber may be restricted
Solution Approach 1:
The flap valve transitions dynamically between open and closed states based on real-time pressure differential. During initial inflation, the flap remains open allowing rapid gas flow into the second chamber. Once pressure equalization occurs or reverse differential develops, the flap closes to maintain pressure. This dynamic behavior optimizes both flow rate and pressure maintenance without compromise.
Solution Approach 2:
The flap acts as an intermediary element that mediates between the two chambers, allowing free flow when needed and blocking when necessary. This intermediate component enables the system to achieve both rapid filling and sustained pressure maintenance by selectively controlling the communication between chambers based on pressure conditions.
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 ensures rapid filling of the airbag while maintaining prolonged pressure in the lower chamber, enhancing passenger cushioning and airbag performance during emergency situations.
Implementation Method 1
The flap is structured to deflect in a direction away from the opening responsive to a pressure differential urging a flow of gas from the first chamber through the opening into the second chamber
Data Source
AI summary
An airbag includes an outer shell defining an interior of the airbag, and a divider positioned in the interior so as to divide the interior into a first chamber and a second chamber. A valve mechanism is operatively coupled to the divider. The valve mechanism includes an opening enabling fluid communication between the first and second chambers, and a flap positioned in the second chamber overlying the opening. The flap is structured to deflect in a direction away from the opening responsive to a pressure differential urging a flow of gas from the first chamber through the opening into the second chamber. The flap is also structured to block the opening responsive to a reverse pressure differential urging a flow of gas from the second chamber through the opening into the first chamber. The flap includes at least one attachment edge along which the flap is attached to the divider and at least one non-attachment edge along which the flap is not attached to the divider. The valve is structured such that at least a predetermined minimum distance between the at least one non-attachment edge and an edge of the opening is maintained during application of the reverse pressure differential to the flap.