Selective Deflector Deployment for Airbag Kinematics
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Solution Overview
Problem
Current vehicle restraint systems face challenges in effectively controlling the kinematics of occupants during a front-oblique vehicle impact, as existing airbag and deflector systems may not adequately direct the airbag's inflation and positioning to mitigate impact forces on occupants.
Innovation Solution
A restraint system comprising an instrument panel, an airbag, and deployable deflectors on either side of the airbag, with pyrotechnic devices and spring-loaded mechanisms that allow the deflectors to translate and rotate from a retracted to a deployed position upon impact detection, positioning the airbag to control occupant kinematics by acting as reaction surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deflectors are added to direct airbag inflation and control occupant kinematics, then safety effectiveness is improved, but device complexity increases
Solution Approach 1:
The restraint system is divided into separate functional modules: the airbag assembly and the deflector assembly. The deflectors are independently deployable components that can be selectively activated based on impact conditions, allowing the system to provide enhanced safety functionality while maintaining a modular structure that manages complexity through functional separation.
Solution Approach 2:
The deflectors are designed as dynamic components that can transition between retracted and deployed states. This dynamic capability allows the system to adapt its configuration based on the specific impact scenario, providing the necessary safety effectiveness only when and where needed, rather than being a permanently complex structure.
2Adaptability or versatility
If multiple deployable deflectors are integrated into the restraint system, then control of occupant kinematics is improved, but structural complexity increases
Solution Approach 1:
The system employs multiple deflectors positioned asymmetrically on different sides of the airbag assembly. This asymmetric configuration allows selective deployment based on the direction and nature of the impact, providing versatile control over occupant kinematics while maintaining a relatively simple overall structure through targeted, rather than universal, 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
The system effectively deploys deflectors to direct the airbag's inflation and positioning, enhancing the control of occupant kinematics during a front-oblique vehicle impact, thereby improving safety by better managing impact forces.
Implementation Method 1
a pyrotechnic device coupled to the deflector
Implementation Method 2
a spring between the panel and the instrument panel, the spring biasing the panel toward the deployed position
Data Source
AI summary
A restraint system for a vehicle includes an instrument panel and an airbag supported by the instrument panel. The restraint system includes a right deflector supported by the instrument panel adjacent the airbag. The right deflector is deployable between a retracted position and a deployed position. The restraint system includes a left deflector supported by the instrument panel adjacent the airbag opposite the right deflector in a cross-vehicle direction. The left deflector is deployable between a retracted position and a deployed position. The restraint system includes a first pyrotechnic device coupled to the right deflector and a second pyrotechnic device coupled to the left deflector.