Airbag Vent Cover Dynamics for Gas Flow Control
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Solution Overview
Problem
Existing airbag devices face challenges in appropriately opening and closing vent holes at the right timing during deployment to meet Low Risk Deployment (LRD) regulations, which are crucial for minimizing injuries to children and passengers by managing gas expansion effectively.
Innovation Solution
An airbag device with a main vent hole, a cover that can switch between open and closed states, an auxiliary vent hole, and a tether system that supports the cover to manage gas emission, ensuring rapid deployment and shock absorption while preventing excessive pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vent hole is opened at the initial time of deployment to rapidly expand the airbag cushion, then the deployment speed is improved, but the LRD performance deteriorates due to excessive gas emission causing injury to children or passengers in the vicinity
Solution Approach 1:
The vent hole is divided into two functional parts: a first vent hole for rapid gas emission during initial deployment, and a second vent hole for controlled gas emission during the cushioning phase. This segmentation allows the system to achieve both rapid deployment and LRD performance by directing gas flow through different pathways at different stages.
Solution Approach 2:
The cover is designed to dynamically transition between covering and uncovering the first vent hole based on deployment stage. During initial deployment, the cover remains closed to prioritize rapid expansion. After the airbag cushion contacts the passenger, the cover uncovers the first vent hole to enable controlled gas emission for shock absorption, thus adapting to different operational phases.
2Object-affected harmful factors
If the vent hole is closed at the initial time of deployment to improve LRD performance, then the injury risk to passengers is reduced, but the deployment speed deteriorates due to restricted gas emission
Solution Approach 1:
The vent hole is divided into two functional parts: a first vent hole for rapid gas emission during initial deployment, and a second vent hole for controlled gas emission during the cushioning phase. This segmentation allows the system to achieve both rapid deployment and LRD performance by directing gas flow through different pathways at different stages.
Solution Approach 2:
The cover is designed to dynamically transition between covering and uncovering the first vent hole based on deployment stage. During initial deployment, the cover remains closed to prioritize rapid expansion. After the airbag cushion contacts the passenger, the cover uncovers the first vent hole to enable controlled gas emission for shock absorption, thus adapting to different operational phases.
3Speed
If the vent hole is opened to rapidly expand the airbag cushion, then the deployment speed is improved, but the gas pressure inside the airbag cushion increases causing potential damage to the airbag
Solution Approach 1:
The vent hole is divided into two functional parts: a first vent hole for rapid gas emission during initial deployment, and a second vent hole for controlled gas emission during the cushioning phase. This segmentation allows the system to achieve both rapid deployment and LRD performance by directing gas flow through different pathways at different stages.
Solution Approach 2:
The cover is designed to dynamically transition between covering and uncovering the first vent hole based on deployment stage. During initial deployment, the cover remains closed to prioritize rapid expansion. After the airbag cushion contacts the passenger, the cover uncovers the first vent hole to enable controlled gas emission for shock absorption, thus adapting to different operational phases.
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 enables rapid airbag deployment, effective shock absorption, and compliance with LRD regulations by controlling gas emission through the auxiliary vent hole, reducing the risk of injury to passengers and preventing airbag damage.
Implementation Method 1
a tether configured to have one end connected to the cover and the other end fixed inside the airbag cushion to provide the tension force to the cover through the main vent hole
Data Source
AI summary
An airbag device for a vehicle may include a main vent hole disposed in an airbag cushion and emit expansion gas therein, a cover disposed on an outer side of the airbag cushion, to be switched between an opened state and a closed state, by a tension force applied thereto, and provided with an auxiliary vent hole through which the expansion gas inside the airbag cushion may be emitted, a tether having a first one end connected to the cover through the main vent hole and a second end fixed inside the airbag cushion to provide the tension force to the cover, and a tether guide disposed on an inner side of the airbag cushion to support the tether and make the tether pass therethrough while being slid on the inner side of the airbag cushion.