Air Bag Vent Valve Dynamic Obstruction Response
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Solution Overview
Problem
Current air bag systems face challenges in controlling the inflation rate and force to meet regulatory requirements for protecting occupants, particularly children, without relying on complex and expensive sensor systems to detect passenger weight.
Innovation Solution
An air bag system with a vent valve that moves between open and closed positions during deployment, allowing increased venting if an obstruction is encountered, such as a child seat, to reduce impact force and then partially closing to maintain pressure for interactions with seated adults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the air bag uses a conventional deployment system without venting control, then the inflation force is sufficient to protect occupants, but the force may be excessive and cause injuries to child seat occupants
Solution Approach 1:
The vent valve transitions from a static closed state to a dynamic state that responds to deployment conditions. During initial deployment, the valve remains closed to maintain inflation force, but if deployment is obstructed (indicating a child seat), the valve opens to increase venting and reduce impact force. This dynamic adaptation allows the system to adjust its protective function based on real-time conditions.
Solution Approach 2:
The system changes the venting parameter during deployment. Initially, venting is restricted to ensure adequate inflation force. When an obstruction is detected (deployment beyond threshold), the vent valve opens to increase the vent area, thereby changing the inflation rate and reducing the final impact force on child seat occupants while maintaining the protective function for normal deployments.
2Reliability
If the air bag provides high inflation force to ensure occupant protection, then safety is improved, but complex sensor systems are required to detect passenger weight and control deployment
Solution Approach 1:
The air bag system performs self-diagnosis during deployment. The vent valve is designed to remain closed during normal deployment and automatically opens if an obstruction is encountered. This self-service mechanism eliminates the need for external sensors to detect passenger weight or deployment conditions, as the system itself provides the detection and response function through its mechanical design.
Solution Approach 2:
The complex sensor system and control electronics are extracted from the air bag system and replaced with a passive mechanical vent valve mechanism. The vent valve inherently responds to deployment conditions without requiring separate detection systems, thereby simplifying the overall device while maintaining the ability to differentiate between normal and obstructed deployments.
3Force
If the air bag uses a vent valve that remains closed during deployment, then inflation force is maintained for normal occupants, but the force cannot be reduced if a child seat is present
Solution Approach 1:
The vent valve is pre-configured to counteract excessive inflation force if an obstruction is present. The valve is designed to open automatically when deployment is obstructed, creating a preliminary protective action that prevents excessive force from building up. This preliminary anti-action occurs during the deployment process itself, before the air bag fully inflates and contacts the child seat with excessive force.
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 reduces the force of air bag deployment on obstructions like child seats while ensuring proper interaction with adults by controlling venting, thus meeting regulatory standards for various age groups without complex sensors.
Implementation Method 1
a vent valve. The vent valve has at least one valve opening, and the vent valve is moveable between a first position where the valve opening is aligned with at least one vent opening and a second position where the valve opening is at least partially misaligned with at least one vent opening to at least partially close the vent opening
Implementation Method 2
Air bag deployment usually involves relatively rapid inflation of the air bag with a gas
Implementation Method 3
This may reduce the force (or energy) that the air bag imparts to the obstruction
Data Source
AI summary
An air bag includes a wall defining an interior in which a gas is received to inflate the air bag, and at least one vent opening through the wall and a vent valve carried by the wall. The vent valve has at least one valve opening, and the vent valve is moveable between a first position where the valve opening is aligned with at least one vent opening and a second position where the valve opening is at least partially misaligned with at least one vent opening to at least partially close the vent opening. The vent valve is in its first position until deployment of the air bag beyond a threshold which moves the vent valve to its second position.