Inflatable Headliner Bladders for Rollover Headroom Protection
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Solution Overview
Problem
Current vehicle headliners with stationary foam parts and countermeasures intrude into the passenger compartment, compromising headroom due to their fixed design, which fails to efficiently meet Federal Motor Vehicle Safety Standard (FMVSS) 201U requirements without occupying unnecessary space.
Innovation Solution
Incorporating inflatable bladders connected to an inflator system, which inflate upon impact to meet FMVSS 201U requirements, replacing traditional foam parts and countermeasures, and featuring a rib structure for added support, allowing a thinner profile and increased headroom when not deployed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stationary foam parts and countermeasures are used to meet FMVSS 201U requirements, then safety requirements are satisfied, but headroom is reduced due to intrusion into passenger compartment
Solution Approach 1:
The patent applies the dynamics principle by replacing stationary foam parts with an inflatable bladder that can change its volume and shape dynamically. The bladder remains collapsed during normal operation to maximize headroom, then inflates during a rollover event to provide the necessary safety countermeasure, thus resolving the contradiction between maintaining safety requirements and preserving passenger space.
Solution Approach 2:
The patent utilizes parameter changes by transforming the physical state of the protective structure from a permanently expanded foam form to an inflatable bladder that changes its volume parameter based on operational conditions. This allows the system to meet safety standards when needed while minimizing space occupation during normal vehicle operation.
2Volume of moving object
If a thin profile headliner is used to increase headroom, then headroom is improved, but ability to meet FMVSS 201U requirements during rollover is compromised
Solution Approach 1:
The thin profile headliner incorporates a dynamically inflatable bladder that maintains a compact form during normal operation, preserving headroom. Upon detection of a rollover event, the bladder inflates rapidly to provide the necessary protective countermeasure, thus achieving both headroom improvement and rollover protection capability.
Solution Approach 2:
The system employs preliminary action by pre-positioning the collapsed bladder within the headliner structure during normal operation. When a rollover event occurs, the bladder can inflate immediately without requiring assembly or activation delays, ensuring that protection is provided precisely when needed while maintaining a thin profile during non-deployment.
3Reliability
If multiple foam shapes and countermeasures are added to meet safety standards, then safety is improved, but device complexity increases
Solution Approach 1:
The patent applies the merging principle by consolidating multiple foam shapes and countermeasures into a single integrated inflatable bladder structure. This unified design meets FMVSS 201U requirements while reducing the number of separate components, simplifying the headliner assembly, and easing manufacturing and installation processes.
Solution Approach 2:
The inflatable bladder serves multiple functions simultaneously: it acts as a structural countermeasure to meet safety standards, provides rollover protection, and maintains a sleek appearance during normal operation. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall 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
The inflatable bladder system effectively raises the headliner upon impact, providing enhanced head clearance and reduced protrusion into the passenger compartment, meeting safety standards while maintaining a thinner profile for increased headroom during non-deployment scenarios.
Implementation Method 1
an inflatable bladder/airbag/heat pressed bladder layers to replace the current stationary foam pieces/counter measures and/or open space gap previously used to meet the FMVSS 201U requirements
Data Source
AI summary
A vehicle includes a passenger compartment having a roof structure having a front header, a pair of side headers and a rear header. A headliner is disposed beneath the roof structure. At least one inflatable bladder is disposed along at least one of the front header, the pair of side headers and the rear header. The at least one inflatable bladder is connected to an inflator. A rib structure is disposed adjacent to the at least one inflatable bladder. The inflatable bladder inflates to a maximum height of 12 cm below the at least one of the front header, the pair of side headers and the rear header.