Delayed Venting Curtain Airbag for Occupant Protection
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Solution Overview
Problem
Inflatable curtain airbags often fail to provide optimal cushioning and ejection prevention in collision scenarios due to inconsistent gas distribution and lack of controlled venting, leading to suboptimal protection for vehicle occupants.
Innovation Solution
The implementation of a delayed venting system within the airbag, utilizing a tortuous vent or venting panel that controls the release of inflation gas, allowing for varying levels of cushioning by segmenting the airbag into chambers with different gas retention properties, thereby enhancing occupant protection during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the airbag retains all inflation gas in a single chamber, then the cushioning force is strong, but the occupant acceleration is excessive and displacement into the airbag is insufficient
Solution Approach 1:
The airbag is divided into multiple chambers (first chamber and second chamber) separated by a venting panel. The first chamber provides initial strong cushioning force, while the second chamber receives vented gas to provide secondary cushioning. This segmentation allows the system to manage occupant deceleration in stages, reducing peak acceleration while maintaining adequate cushioning force throughout the impact event.
Solution Approach 2:
The venting panel transitions from a closed state during initial inflation to an open state during occupant impact, dynamically controlling gas flow between chambers. This dynamic behavior allows the airbag to adapt its cushioning characteristics based on the collision phase, providing strong initial force then gradually reducing acceleration as gas vents to the second chamber.
2Speed
If the airbag vents inflation gas quickly, then the occupant acceleration is reduced, but the cushioning duration and effectiveness are diminished
Solution Approach 1:
By segmenting the gas storage into two chambers with controlled inter-chamber venting, the system extends the cushioning duration. Gas flows from the first chamber to the second chamber during the impact event, providing a prolonged gas supply that maintains cushioning pressure throughout the entire occupant deceleration process rather than depleting quickly.
Solution Approach 2:
The venting panel acts as an intermediary mechanism that controls gas transfer between chambers. It regulates the timing and rate of gas flow, ensuring that cushioning duration is extended without causing excessive acceleration, thereby mediating between the need for quick pressure reduction and prolonged cushioning support.
3Device complexity
If the airbag uses a simple single-chamber design, then the device complexity is low, but the cushioning consistency and ejection prevention performance are suboptimal
Solution Approach 1:
The multi-chamber design with venting panel provides superior cushioning consistency by distributing gas pressure more evenly throughout the impact event. The first chamber handles initial high-pressure cushioning while the second chamber provides sustained lower-pressure support, ensuring consistent protection throughout the collision sequence, which a single chamber cannot achieve reliably.
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 delayed venting system reduces occupant acceleration and increases displacement into the airbag, resulting in improved cushioning and protection by managing gas distribution and pressure within the airbag, enhancing its performance in collision events.
Implementation Method 1
The delayed venting system reduces occupant acceleration and increases displacement into the airbag, resulting in improved cushioning and protection by managing gas distribution and pressure within the airbag
Implementation Method 2
The first chamber may comprise a plurality of inflatable cushion segments configured to cushion a vehicle occupant
Data Source
AI summary
An airbag, or inflatable curtain airbag assembly, can include one or more chambers and vents. The vents can be in fluid communication with one or more of the chambers. The vents can be configured to delay passage of inflation gas from an interior of the airbag into an interior chamber or to an exterior of the airbag upon deployment of the airbag. The vents can also be configured to transition from a closed configuration to an open configuration when an internal pressure of the airbag reaches a predetermined value.