Airbag Vent Closure Structure for Adaptive Deployment Pressure
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Solution Overview
Problem
During emergency braking, passengers may be injured by the deployment force of airbags due to negative acceleration, as the airbag deployment pressure is not adequately adjusted to the passenger's position, leading to potential head or neck injuries.
Innovation Solution
An airbag device with a vent part and tether cord system that allows the airbag cushion to maintain preset pressure by tightening and closing the vent through a cord movement prevention part, preventing excessive gas discharge and reducing impact on the passenger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the airbag cushion part is inflated with operating gas to deploy toward the passenger, then the passenger is protected from colliding with the vehicle body, but the deployment force may injure the passenger during emergency braking
Solution Approach 1:
The vent part is configured to dynamically adjust gas discharge based on deployment conditions. During normal collision, the vent remains closed to maintain full pressure. During emergency braking with excessive deployment force, the vent opens to release gas and reduce pressure, thus adaptively adjusting protection level to avoid injury
Solution Approach 2:
The internal pressure parameter of the airbag is changed from fixed to variable. The vent part enables pressure reduction by discharging operating gas when deployment force exceeds safe thresholds, transforming the airbag from a constant-pressure system to a variable-pressure system that adapts to different collision scenarios
2Object-affected harmful factors
If gas is discharged through the vent part to reduce deployment pressure, then passenger injury is prevented, but the airbag cushion part cannot maintain preset pressure
Solution Approach 1:
The tether cord part is pre-configured to close the vent part after gas discharge. This preliminary arrangement ensures that once the deployment force becomes excessive and gas needs to be released, the vent will automatically close afterward to restore preset pressure without requiring additional control mechanisms
Solution Approach 2:
The vent part and tether cord part form a self-regulating system. The vent automatically opens when pressure becomes excessive, discharges gas to reduce pressure, and then automatically closes to restore pressure. This self-service mechanism maintains pressure balance without external intervention
3Object-affected harmful factors
If the vent part is designed to discharge operating gas to reduce deployment pressure, then passenger safety is improved during emergency braking, but the vent part cannot maintain preset pressure in the airbag cushion part
Solution Approach 1:
The vent part transitions from a static opening to a dynamic valve that opens and closes based on internal pressure conditions. The tether cord part provides the closing action, creating a dynamic system that alternates between gas discharge (when pressure is excessive) and pressure maintenance (when pressure is appropriate)
Solution Approach 2:
The vent part operates in periodic cycles: opens to discharge gas when pressure exceeds threshold, closes to maintain pressure when gas discharge is complete, opens again when pressure builds up excessively, and so on. This periodic action balances gas discharge needs with pressure maintenance requirements
Data Source
AI summary
An airbag device may include: an airbag cushion part inflated by operating gas introduced thereto; a vent part formed through the airbag cushion part, and configured to discharge the operating gas within the airbag cushion part; a cord movement prevention part mounted on one side of the vent part; and one or more tether cord parts mounted on the other side of the vent part, and configured to tighten and close the vent part while passing through the cord movement prevention part, when the airbag cushion part is deployed.