Nested Airbag Inflation Speed Control
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Solution Overview
Problem
Conventional airbag deployment systems lack the ability to optimize airbag deployment based on the specific needs of the occupant or object being protected, often resulting in inadequate protection due to uniform inflation speeds and lack of control over airbag expansion.
Innovation Solution
A vehicular airbag system with multiple airbags arranged in a nested configuration, each inflated by a distinct inflator system at varying speeds, controlled by a centralized system to ensure sequential and staggered inflation, and utilizing elongate belts to limit airbag expansion, providing tailored protection based on the occupant's position and crash parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single airbag is used with uniform inflation speed, then the device complexity is low, but the protection effectiveness is insufficient for different occupant positions and crash scenarios
Solution Approach 1:
The single airbag is divided into multiple nested airbags (inner airbag, outer airbag) with different inflation speeds and characteristics. Each airbag can be independently controlled to provide optimized protection for different body regions and crash scenarios, thereby improving overall protection effectiveness while managing system complexity through modular design
Solution Approach 2:
Multiple airbags are arranged in a nested configuration where the inner airbag is positioned within the outer airbag. This nesting allows sequential or staggered inflation where the inner airbag deploys first to protect critical areas, followed by the outer airbag for additional cushioning, creating a layered protection system that adapts to different crash severities
2Adaptability or versatility
If multiple inflator systems with different inflation speeds are used, then the adaptability to different crash scenarios is improved, but the device complexity increases
Solution Approach 1:
Different inflator systems are assigned to different airbags based on their specific protection requirements. The inner airbag receives a high-speed inflator for immediate protection of critical body regions, while the outer airbag uses a lower-speed inflator for gradual deployment. This localized optimization of inflation characteristics improves adaptability to various crash scenarios
Solution Approach 2:
The system employs dynamic control of inflation speeds through multiple independently controllable inflators. The control system can activate different inflators at different times and at different pressure rates based on crash sensor data, enabling the airbag system to adapt its deployment characteristics in real-time to match the specific crash scenario
3Reliability
If elongate belts are added to limit airbag expansion, then the control over airbag force is improved, but the device complexity increases
Solution Approach 1:
Elongate belts are integrated into the airbag structure as flexible restraining elements. These belts are positioned to limit the maximum expansion of the airbag in specific directions, thereby controlling the protective force applied to the occupant. The flexible nature of the belts allows them to conform to the airbag's inflation while providing mechanical restraint to prevent excessive deployment
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 provides enhanced cushioning and protection by ensuring the innermost airbag inflates first, followed by outer airbags, with controlled expansion to prevent excessive force on occupants, thereby improving safety and reducing the risk of injury.
Implementation Method 1
A plurality of activatable inflator systems is configured to inflate a respective airbag at a different speed of inflation
Data Source
AI summary
Vehicular airbag system for a driver includes a steering column, a steering wheel assembly rotatably mounted to the steering column and including a core, and a plurality of airbags arranged in the core and configured to inflate outward from the core. The airbags are nested such that each airbag is configured to inflate within or over at least one other airbag. Activatable inflator systems are configured to inflate a respective airbag at a different speed of inflation. A control system is coupled to the inflator systems and controls activation of the inflator systems and thus inflation of the airbags. The inflator systems are configured such that one of the inflator systems configured to inflate an innermost airbag has a highest speed of inflation of the inflator systems and one of the inflator systems configured to inflate an outermost airbag has a lowest speed of inflation of the inflator system.