Vent Flap Airbag Valve for Oblique Collision Protection
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Solution Overview
Problem
Current airbag systems face challenges in effectively cushioning occupants during oblique collisions, where impact forces act both forward and laterally, as they often fail to provide adequate protection and positioning, particularly in side-impact scenarios.
Innovation Solution
The implementation of a valve assembly with an aperture and a vent flap in inflatable airbag assemblies, which allows controlled deflation to facilitate a gradual ride-down of occupants by venting inflation gas when a predetermined pressure threshold is reached or upon engagement, thereby preventing high-speed impact with vehicle structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the airbag maintains high inflation pressure to provide strong cushioning, then occupant protection is improved, but the risk of high-speed impact with vehicle structures increases
Solution Approach 1:
The airbag system transitions from a static high-pressure state to a dynamic pressure-reduction state through the vent flap mechanism. The vent flap remains closed during inflation to build pressure, then opens to allow controlled deflation, creating a dynamic system that adapts pressure levels based on operational phase (inflation vs. cushioning)
Solution Approach 2:
The airbag operation follows a periodic cycle: rapid inflation to high pressure, followed by controlled venting through the aperture, then gradual deflation. This periodic action allows the system to provide strong initial cushioning while subsequently reducing pressure to prevent harmful high-speed impacts
2Object-affected harmful factors
If the airbag deflates rapidly to reduce pressure, then the risk of impact injury is reduced, but the cushioning effectiveness during occupant engagement decreases
Solution Approach 1:
The vent flap creates a dynamic pressure control system that adjusts deflation rate based on chamber pressure. High pressure triggers rapid venting to reduce injury risk, while declining pressure allows the flap to close and maintain cushioning effectiveness, creating a self-regulating dynamic response
3Object-affected harmful factors
If the vent flap opens early to vent inflation gas, then pressure buildup is reduced, but the airbag cannot achieve sufficient inflation for effective cushioning
Solution Approach 1:
The vent flap operates as a pressure-sensitive feedback mechanism that responds to chamber pressure conditions. When pressure exceeds the threshold required for effective cushioning, the flap opens to vent gas and reduce pressure, automatically closing when pressure drops to maintain optimal cushioning levels without manual intervention
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 occupant safety by providing improved positioning and cushioning during oblique collisions, reducing the risk of injury by gradually deflating the airbag to slow down the occupant's movement, thus preventing high-speed impacts with vehicle components.
Implementation Method 1
allows controlled deflation to facilitate a gradual ride-down of occupants by venting inflation gas when a predetermined pressure threshold is reached
Data Source
AI summary
A side inflatable airbag assembly for a vehicle is disclosed. Inflatable airbag assemblies may provide protection for an occupant in a vehicle collision event. In a side collision event, or other event producing lateral movement of the occupant relative to the vehicle, the disclosed inflatable airbag assembly may receive and support the occupant during ride-down so as to prevent or minimize injury resulting from impact with a vehicle sidewall. An inflatable airbag cushion of the inflatable airbag assembly comprises a valve with an aperture and a vent flap that has a strong connection and a weak connection to the inflatable airbag cushion. The disclosed airbag may differentially support the occupant by providing varied degrees of support for the shoulder, pelvis, and torso, which may be particularly beneficial to an elderly occupant whose bones may be more susceptible to some injury types and modes as a result of age-incident health issues.