Door-Mounted Airbag Kinematic Control via Pyrotechnic Cable
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Solution Overview
Problem
Current airbag systems mounted on vehicle doors lack effective mechanisms to control occupant kinematics during side impacts, particularly in controlling the movement of occupants in a cross-vehicle direction.
Innovation Solution
The airbag system includes an upper and lower inflatable portion supported by a vehicle door, with a pyrotechnic device and cable mechanism that inflates the airbag between the occupant and the door, using a hook and ring system to secure the airbag in place, and a solenoid to manage the hook's movement, ensuring the airbag inflates to limit downward movement and distribute force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an airbag is mounted on the vehicle door to protect occupants during side impacts, then occupant safety is improved, but the airbag may not effectively control occupant kinematics in cross-vehicle direction
Solution Approach 1:
The airbag system transitions from a static mounted structure to a dynamic system that actively controls occupant kinematics. The upper and lower inflatable portions work in coordination with the pyrotechnic device and cable mechanism to dynamically adjust and control occupant movement during side impacts, transforming the airbag from a passive protective barrier to an active kinematic control system.
2Ease of manufacture
If a pyrotechnic device and cable mechanism are added to control airbag inflation, then occupant kinematic control is improved, but device complexity increases
Solution Approach 1:
The airbag is divided into distinct upper and lower inflatable portions, each serving specific functions in controlling occupant kinematics. This segmentation allows independent optimization of each portion's inflation characteristics and control mechanisms, managing overall system complexity through modular functional division.
Solution Approach 2:
The cable mechanism acts as an intermediary between the pyrotechnic device and the airbag, translating the pyrotechnic impulse into controlled mechanical motion that regulates airbag deployment. This intermediary component enables precise kinematic control while isolating the complexity of the control system from the airbag structure itself.
3Force
If the airbag is designed to inflate between the occupant and door, then force distribution is improved, but the airbag requires precise positioning mechanisms
Solution Approach 1:
The airbag's upper and lower portions are designed with differentiated inflation characteristics and positioning requirements. The upper portion interacts with the occupant's upper body while the lower portion controls lower body movement, allowing localized optimization of force distribution and positioning mechanisms for each region's specific protective needs.
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 effectively controls occupant kinematics during side impacts by inflating the airbag to limit downward movement and distribute force across the torso and head, enhancing safety by stabilizing the occupant's position between the door and seat.
Implementation Method 1
a pyrotechnic device supported by the vehicle pillar. The assembly includes a cable extending along the vehicle pillar from the pyrotechnic device and coupling the upper portion of the airbag to the pyrotechnic device
Implementation Method 2
The airbag includes an upper portion inflatable upwardly and a lower portion inflatable downwardly
Data Source
AI summary
An assembly for a vehicle includes a vehicle pillar. The assembly includes a vehicle door adjacent the vehicle pillar. The assembly includes an airbag supported by the vehicle door. The airbag includes an upper portion inflatable upwardly and a lower portion inflatable downwardly. The assembly includes a pyrotechnic device supported by the vehicle pillar. The assembly includes a cable extending along the vehicle pillar from the pyrotechnic device and coupling the upper portion of the airbag to the pyrotechnic device.