Gas Bag Module Limiting Strap Obstacle Detection
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Solution Overview
Problem
In vehicle occupant restraint systems, existing gas bag modules struggle to reliably detect and adapt to non-optimal occupant positions or child seats during unfolding, particularly in 'top-mount' installations, leading to inconsistent discharge opening closure and reduced restraint effectiveness.
Innovation Solution
A gas bag module design where the limiting strap is guided along the gas bag wall, increasing the region sensitive to obstacles, with the closure device actuated by the tensioned limiting strap to control discharge openings, enhancing sensitivity and adaptability to various unfolding scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the limiting strap is connected only at a single fastening point to the gas bag wall, then the device structure is simple, but the sensitivity to detect obstacles and non-optimal occupant positions is insufficient
Solution Approach 1:
The limiting strap is divided into multiple segments or guiding sections that are distributed along the gas bag wall. Instead of a single connection point, the strap is guided through multiple points or along a defined path on the gas bag wall, creating segmented interaction zones that collectively detect obstacles and control discharge opening closure more reliably
Solution Approach 2:
The limiting strap arrangement transitions from a single-point connection to a distributed linear arrangement along the gas bag wall. This dimensional expansion from point to line contact increases the detection surface area and provides multiple interaction points for obstacle detection, thereby improving reliability without proportionally increasing complexity
2Measurement precision
If the limiting strap is guided along the gas bag wall over a longer region, then the sensitivity to obstacles is increased, but the device complexity increases
Solution Approach 1:
The limiting strap is guided along specific regions or zones of the gas bag wall where obstacle detection is most critical. Rather than uniformly distributing the strap across the entire gas bag, the guidance is concentrated in local areas that provide maximum sensitivity for detecting non-optimal occupant positions and obstacles, thereby achieving high measurement precision with controlled complexity
3Adaptability or versatility
If the discharge opening is closed based on a single point unfolding detection, then the control mechanism is simple, but the adaptability to various occupant positions and obstacles is reduced
Solution Approach 1:
The limiting strap system performs multiple functions simultaneously: it detects obstacles, determines occupant position, controls discharge opening closure, and provides structural guidance for gas bag unfolding. This multi-functional design allows the same mechanism to adapt to various occupant positions and obstacle scenarios without requiring separate control systems for each function, thereby achieving versatility without proportional complexity increase
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
This design enhances the sensitivity and reliability of the gas bag's unfolding behavior, ensuring proper closure of discharge openings and improved occupant protection by considering a broader range of positions and obstacles, thereby optimizing restraint performance.
Implementation Method 1
the limiting strap being tensioned in the case of an unimpeded unfolding of the gas bag such that the closure device closes the discharge opening
Implementation Method 2
the limiting strap is guided along the gas bag wall
Data Source
AI summary
A gas bag module includes a module housing (18), a gas bag (24) having a gas bag wall (26), a discharge opening (20) which can be closed by a closure device (22), and a limiting strap (28), the limiting strap (28) being coupled with the gas bag wall (26) and the closure device (22). The limiting strap (28) is tensioned in case of an unimpeded unfolding of the gas bag (24) such that the closure device (22) closes the discharge opening (20), and the limiting strap (28) is guided along the gas bag wall (26).