Pyrotechnic Tether Release for Adaptive Airbag Deployment
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Solution Overview
Problem
Current inflatable airbag systems face limitations in adapting to varying occupant sizes and collision severities due to fixed tether configurations, which restrict the airbag's deployment dimensions and effectiveness.
Innovation Solution
The implementation of a tether release assembly triggered by vehicle sensors, allowing the airbag to transition between constrained and unconstrained configurations by releasing internal tethers, enabling adaptive deployment based on occupant presence and collision conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed tether configurations are used in airbag systems, then the structural simplicity and ease of manufacture are improved, but the adaptability to varying occupant sizes and collision severities deteriorates
Solution Approach 1:
The patent applies the dynamics principle by implementing a tether release assembly that transitions the airbag system from a fixed tether configuration to a dynamic one. The tethers can be released upon deployment through a pyrotechnic squib mechanism, allowing the airbag to expand fully without tether constraints. This dynamic transformation enables the system to adapt to different occupant sizes and collision severities while maintaining simple manufacturing processes for the initial fixed configuration.
2Reliability
If tethers are released to allow greater airbag expansion, then the occupant safety and protection effectiveness are improved, but the device complexity increases due to the tether release assembly
Solution Approach 1:
The patent applies segmentation by dividing the airbag system into distinct functional components: the airbag itself, the tethers, the tether release assembly, and the pyrotechnic squib. This segmentation allows each component to be optimized independently - the airbag for protection effectiveness, the tethers for controlled constraint, and the release mechanism for reliable activation. The modular approach manages device complexity by creating clearly defined subsystems with specific functions.
Solution Approach 2:
The patent uses an intermediary mechanism - the pyrotechnic squib - to mediate between the control system and the tether release function. The squib acts as an intermediate energy conversion device that transforms electrical or chemical signals into mechanical force to sever the tethers. This intermediary approach simplifies the overall control architecture while ensuring reliable tether release for improved occupant safety.
3Device complexity
If constrained airbag configuration is used, then the device complexity is reduced, but the deployment flexibility and effectiveness deteriorate
Solution Approach 1:
The patent implements dynamics by designing a dual-state airbag system that can transition from a constrained configuration (with tethers) to an unconstrained configuration (without tethers). The tether release assembly enables this dynamic transformation based on deployment conditions. This allows the system to maintain simple constrained operation when appropriate while gaining deployment flexibility when needed, without permanently increasing device complexity.
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 solution enhances airbag deployment flexibility and effectiveness by allowing for greater width and height expansion, improving occupant safety by ensuring a more comprehensive protection based on individual occupant needs and collision severity.
Implementation Method 1
a pyrotechnic squib configured to generate heat to melt the piston
Data Source
AI summary
A depth to which an inflatable airbag can deploy may varied by internal tethers. If the tethers are coupled to a release assembly, then in an unreleased state, the tethers can limit the depth of airbag deployment; however, if the tethers are released, the airbag can deploy of a full depth.