Dynamic Airbag Venting Duct for Occupant Position Adaptation
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Solution Overview
Problem
Existing airbag systems face challenges in balancing the protection of both 'in-position' and 'out-of-position' occupants, as they struggle to adjust airflow through vents based on occupant position during deployment, leading to inconsistent softness or hardness of the airbag.
Innovation Solution
An airbag assembly with a movable duct that changes its venting position from outside to inside the airbag as it inflates, allowing for controlled gas flow, providing a softer airbag initially and a harder airbag later, by adjusting the airflow based on the occupant's position through a combination of duct movement and tether mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the airbag uses fixed venting, then the structure is simple, but the airbag cannot adapt to different occupant positions resulting in inconsistent softness or hardness
Solution Approach 1:
The duct is designed to move dynamically relative to the airbag during deployment. The duct transitions from an external position before deployment to an internal position during deployment, automatically adjusting the venting mechanism based on the airbag's inflation state and occupant position without requiring complex sensors or control systems
Solution Approach 2:
The venting mechanism uses the airbag's own deployment motion to drive the duct's movement. The system self-regulates the venting based on the natural inflation process, eliminating the need for external control systems or additional actuators
2Reliability
If the airbag provides harder protection for in-position occupants, then protection effectiveness improves, but it becomes too hard for out-of-position occupants causing injury risk
Solution Approach 1:
The airbag provides different local characteristics at different deployment stages. During early deployment, the movable duct positions to allow more gas escape, creating a softer airbag suitable for out-of-position occupants. During later deployment stages, the duct positions to restrict flow, creating a harder airbag for in-position occupants, thus providing spatially and temporally differentiated protection
3Object-affected harmful factors
If the airbag provides softer initial deployment, then safety for out-of-position occupants improves, but protection effectiveness decreases for in-position occupants
Solution Approach 1:
The venting mechanism operates in distinct phases corresponding to different deployment stages. The movable duct transitions between positions to create periodic changes in gas flow restriction, providing softer characteristics during early deployment and harder characteristics during later deployment, thus serving different occupancy scenarios at different time periods
Data Source
AI summary
An example airbag assembly includes an airbag and a duct having an opening for venting gas. The duct moves between a first position where the opening is outside the airbag and a second position where the opening is inside the airbag. Inflating the airbag moves the duct between the first position and the second position.