Variable Gas Flow Throttle for Airbag Inflator Temperature Compensation
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Solution Overview
Problem
Airbag inflators exhibit variations in pressure profile and gas flow rate due to temperature storage conditions, leading to inconsistent performance, with existing solutions employing complex components and materials that increase costs and variability.
Innovation Solution
A variable gas flow throttle member with a tab that bends to reduce the gas flow area in response to a predetermined minimum gas pressure, allowing gases to pass through a smaller area at higher temperatures, thereby throttling the outflow and ensuring consistent inflation performance across temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fixed gas flow throttle is used, then the device structure is simple, but the inflation performance varies significantly with storage temperature
Solution Approach 1:
The patent applies the dynamics principle by making the throttle member movable rather than fixed. The throttle member can shift position in response to pressure differential forces, dynamically adjusting the gas flow area. This allows the system to adapt to different storage temperatures automatically, resolving the contradiction between performance consistency and structural simplicity.
Solution Approach 2:
The patent changes the parameter of gas flow area from fixed to variable. By allowing the throttle member to move, the effective gas flow area changes in response to storage temperature conditions. This parameter change enables consistent inflation performance across different temperatures without requiring complex control systems.
2Reliability
If a shape memory alloy is used to control gas flow area, then temperature responsiveness is achieved, but manufacturing tolerances cause wide performance variation
Solution Approach 1:
The patent applies self-service by enabling the throttle member to automatically adjust its position based on pressure differential forces generated during inflation. The system self-regulates the gas flow area without requiring external control mechanisms or temperature-sensitive materials, thereby eliminating performance variability caused by manufacturing tolerances of specialized components.
Solution Approach 2:
The patent extracts the temperature responsiveness function from specialized materials like shape memory alloys and replaces it with a pressure-driven mechanical adjustment mechanism. This removes the dependency on materials with tight manufacturing tolerances while achieving the same functional outcome of consistent performance.
3Reliability
If complex rotating valves or vent rings are used, then temperature compensation is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the temperature compensation function from complex rotating valves and vent rings, implementing it instead through a simple movable throttle member driven by pressure differential forces. This maintains temperature compensation capability while dramatically reducing device complexity and eliminating the need for specialized temperature-responsive components.
Solution Approach 2:
The movable throttle member automatically compensates for temperature effects through pressure-driven movement, without requiring complex control mechanisms. The system self-regulates gas flow based on the actual inflation conditions, achieving temperature compensation with minimal structural complexity.
4Reliability
If sliding valves or thermostatic elements are used, then temperature-responsive flow control is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the temperature-responsive control function from sliding valves and thermostatic elements, implementing it through a pressure-driven movable throttle member. This maintains the ability to adjust gas flow in response to storage conditions while using simpler, more easily manufactured components with fewer moving parts and no specialized materials.
Solution Approach 2:
The throttle member automatically adjusts gas flow based on pressure differential forces that arise during inflation, eliminating the need for thermostatic elements or complex sliding valve mechanisms. This self-regulating approach achieves temperature-responsive control with simpler manufacturing requirements.
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 solution reduces pressure differences between hot and cold storage conditions, optimizing airbag inflation by ensuring consistent performance across ambient and cold storage conditions, while eliminating the effects of hot temperature storage, resulting in a more controlled and uniform pressure profile.
Implementation Method 1
a tab being bent towards the gas flow passageway by a predetermined minimum gas pressure inside the gas storage container to at least partially block the gas flow passageway and reduce the size of the gas flow area
Implementation Method 2
a tab being bent towards the gas flow passageway by a predetermined minimum gas pressure
Data Source
AI summary
An airbag inflator has a variable gas flow throttle disposed in a gas flow path. The throttle has at least one gas passageway through a base portion thereof. A tab extends from the base portion and is bendable towards the base portion by a selected amount of gas pressure to close, or at least partially closes, the gas passageway. The tab may have another gas passageway therethrough.