Window and Adjacent Airbag Pressure Differential for Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In occupant protection apparatuses, the adjacent airbag often shakes when the window airbag inflates and contacts it, due to differences in internal pressure, which can disrupt the receiving surface and compromise protection.
Innovation Solution
The apparatus ensures that the internal pressure of the window airbag is lower than the adjacent airbag by adjusting the volume reduction rate and wrap amount between the two, maintaining a specific pressure ratio to prevent shaking, with the window airbag's inflation chamber being designed to reduce volume and pressure accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the window airbag and adjacent airbag are both inflated to protect occupants, then occupant protection is improved, but the adjacent airbag shakes due to pressure differences
Solution Approach 1:
The patent applies parameter changes by controlling the internal pressure parameters of both airbags. Specifically, the window airbag's internal pressure is set to be lower than the adjacent airbag's internal pressure when they contact each other. This pressure parameter differentiation prevents the adjacent airbag from shaking while maintaining effective occupant protection from both airbags.
2Reliability
If the window airbag inflates to cover the vehicle inside, then occupant protection is improved, but the receiving surface of the adjacent airbag shifts
Solution Approach 1:
The patent controls the internal pressure parameter of the window airbag to be lower than that of the adjacent airbag during contact. This pressure parameter control prevents the window airbag from excessively compressing the adjacent airbag, thereby maintaining the receiving surface position and preventing shifts that would compromise protection precision.
3Reliability
If the internal pressure of the window airbag is increased to improve protection, then occupant protection is improved, but the adjacent airbag shakes more intensely
Solution Approach 1:
The patent optimizes the pressure parameter by setting the window airbag's internal pressure lower than the adjacent airbag's internal pressure. This parameter optimization ensures effective protection while eliminating the harmful shaking effect in the adjacent airbag that would occur with higher pressure.
Solution Approach 2:
The patent converts the potential harmful effect of pressure difference into a beneficial configuration. By deliberately designing the pressure relationship where the window airbag has lower pressure than the adjacent airbag, the potential harm of pressure-induced shaking is transformed into a stable operational state that maintains both protection effectiveness and system stability.
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 effectively suppresses shaking in the adjacent airbag, ensuring a stable receiving surface for occupants by maintaining a controlled pressure and volume relationship between the window and adjacent airbags.
Implementation Method 1
The internal pressure P1 of the window airbag when inflation is completed is lower than the internal pressure P2 of the adjacent airbag when inflation is completed
Data Source
AI summary
An occupant protection apparatus is provided with a first airbag device having a window airbag that protects an occupant in a vehicle and a second airbag device having an adjacent airbag that completes inflation to contact the window airbag for which inflation is completed, thereby protecting the occupant. Where the internal pressure of an inflation chamber at the contact site during contact with the adjacent airbag by the window airbag is P1 and the internal pressure of the adjacent airbag is P2, P1<P2 is satisfied. The wrap amount of the inflation chamber with the adjacent airbag is set as a proportion of a calculated value or less of a predetermined numeric expression.