Airbag Vent Flap Tether Dynamics for Pressure Management
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Solution Overview
Problem
Existing airbag systems face challenges in appropriately opening and closing vent holes during deployment to manage gas pressure and ensure passenger safety, particularly for children or passengers close to the airbag, as they struggle to synchronize vent hole operation with the deployment process and seating conditions.
Innovation Solution
An airbag apparatus featuring a vent hole with a flap and tether system, where the flap is initially closed by the tether during deployment and opens when passengers load onto the airbag, allowing controlled gas discharge for optimal cushioning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vent hole is open at the initial stage of deployment to discharge inflation gas, then the airbag cushion can be rapidly inflated, but excessive gas pressure may be generated causing damage to the airbag cushion or injury to passengers
Solution Approach 1:
The vent hole is designed to dynamically change its opening state during deployment. Initially closed to enable rapid inflation, then automatically opens when the airbag cushion is fully deployed to discharge excess gas pressure, preventing damage and injury
Solution Approach 2:
The tether is pre-configured to automatically pull and open the vent hole flap at the appropriate moment when the airbag cushion reaches full deployment, eliminating the need for complex sensing systems while ensuring timely pressure relief
2Speed
If the vent hole is closed at the initial stage to rapidly inflate the airbag cushion, then deployment speed is improved, but gas pressure builds up excessively requiring the vent hole to open at the right time
Solution Approach 1:
The vent hole transitions from closed to open state dynamically during the deployment process, initially remaining closed to maintain high inflation speed, then opening automatically when the airbag cushion is fully deployed to release excess pressure
Solution Approach 2:
The system uses the airbag cushion's own deployment state to control the vent hole opening. When the cushion reaches full deployment, the tether automatically pulls the vent hole open without requiring external control systems, achieving self-regulated pressure management
3Reliability
If the vent hole is open to discharge inflation gas for low risk deployment, then passenger safety is improved, but the airbag cushion cannot rapidly restrain passengers at the initial stage
Solution Approach 1:
The vent hole's opening state changes dynamically based on deployment progress. It remains closed during the critical initial restraint phase to maximize inflation speed and passenger restraint, then opens automatically when fully deployed to enhance safety by discharging excess gas pressure
Solution Approach 2:
The tether mechanism is pre-configured to automatically open the vent hole at the optimal moment when the airbag cushion reaches full deployment, ensuring that safety ventilation occurs at the right time without compromising initial restraint performance
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 system ensures quick airbag deployment while preventing excessive gas pressure, enhancing passenger safety by adjusting vent hole opening based on deployment stage and passenger loading, thereby reducing injury risks.
Implementation Method 1
a tether configured to have one end portion penetrating through the vent hole of the airbag cushion to be coupled to an internal side surface of the flap and be partially supported on an internal side surface of the airbag cushion to pull the flap when the airbag cushion is fully deployed
Implementation Method 2
release a tensile force when the airbag cushion is loaded to deploy the flap outwardly of the airbag cushion by the inflation gas, to open the vent hole
Data Source
AI summary
An airbag apparatus for a vehicle may include an airbag cushion configured to be provided with a vent hole for discharging inflation gas therein to the outside; a flap configured to have an external circumferential surface partially coupled to the airbag cushion along a rim of the vent hole; and a tether configured to have one end portion penetrating through the vent hole of the airbag cushion to be coupled to an internal side surface of the flap and be partially supported on an internal side surface of the airbag cushion to pull the flap when the airbag cushion is fully deployed, to close the vent hole and release a tensile force when the airbag cushion is loaded to deploy the flap outwardly of the airbag cushion by the inflation gas, to open the vent hole.