Airbag Cushion Adaptive Diffuser for Out-of-Position Impact
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Solution Overview
Problem
Conventional airbag systems do not effectively manage partial or suppressed inflation to accommodate out-of-position occupants, such as children in rear-facing seats or adults positioned close to the airbag, which can result in excessive deploying impact.
Innovation Solution
The airbag cushion incorporates a diffuser and control tether system that vents gas to accommodate varying occupant positions, allowing for partial inflation when an occupant is out-of-position and full inflation when the occupant is in a normal position, by redirecting inflation gas through diffuser vents connected to the cushion membrane via a control tether.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the airbag cushion is designed to fully inflate for all conditions, then maximum protection is provided for normally positioned occupants, but excessive deploying impact occurs for out-of-position occupants
Solution Approach 1:
The airbag system dynamically adjusts its inflation behavior based on real-time detection of occupant position. The control system monitors whether the occupant is in a normal or out-of-position state and automatically modifies the inflation sequence and pressure characteristics accordingly, transitioning from a static to a dynamic protection system that adapts to varying conditions.
Solution Approach 2:
The system changes key inflation parameters including pressure levels, inflation rate, and timing sequences based on detected occupant position. For out-of-position occupants, the system reduces inflation pressure and modifies the inflation timeline to prevent excessive impact, while maintaining full inflation parameters for normally positioned occupants to ensure adequate protection.
2Device complexity
If the airbag cushion uses a single inflation pattern, then the system is simple to control, but it cannot accommodate varying occupant positions effectively
Solution Approach 1:
The control system transitions from a static single-pattern approach to a dynamic multi-pattern system that automatically selects appropriate inflation sequences based on detected occupant position. This enables the system to accommodate varying occupant positions while maintaining manageable complexity through automated detection and response protocols.
Solution Approach 2:
The airbag system performs self-diagnosis and self-adjustment by automatically detecting occupant position and selecting the appropriate inflation pattern without requiring manual intervention. The control system monitors sensor inputs and autonomously determines the correct deployment strategy, reducing the burden on the user while enhancing adaptability.
3Speed
If the airbag cushion inflates rapidly for immediate protection, then response time is minimized, but impact force increases for out-of-position occupants
Solution Approach 1:
The inflation speed is dynamically adjusted based on detected occupant position. For normally positioned occupants, the system maintains rapid inflation to ensure immediate protection. For out-of-position occupants, the system automatically reduces inflation speed to minimize impact force while still providing timely protection, creating a dynamic response that balances speed and safety.
Solution Approach 2:
The system modifies the inflation rate parameter based on occupant position detection. When an out-of-position occupant is detected, the control system reduces the inflation rate and adjusts pressure build-up characteristics to lower impact forces. For normally positioned occupants, the system maintains high inflation rates to ensure rapid protection 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
This configuration ensures optimal protection by adjusting deployment pressure based on the occupant's position, preventing excessive impact on out-of-position individuals while providing necessary restraint for normally positioned occupants.
Implementation Method 1
a diffuser to re-direct the inflation gas from the inflator elsewhere within the airbag cushion
Implementation Method 2
The diffuser may be moved by a control tether in response to expansion of the cushion
Data Source
AI summary
An airbag cushion is disclosed for use in automotive protective systems. The airbag cushion includes a diffuser tethered to the membrane of the cushion. The airbag cushion partially expands when an obstruction is encountered and fully expands when no obstruction is encountered. The tethered diffuser is controlled by expansion of the cushion. This permits the cushion to vary the amount of gas vented from the cushion to adjust for out-of-position conditions and normal restraint conditions.