Gas Generator Pressure Stabilization via Segmented Ports
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Solution Overview
Problem
Existing gas generators face challenges in maintaining consistent output pressure due to environmental temperature fluctuations, and existing solutions either fail to address the issue effectively or require complex sensor systems and control mechanisms.
Innovation Solution
A gas generator design featuring multiple gas discharge port groups or ports that open at different pressures, with at least the highest pressure port group covered by a cooling member to regulate internal pressure and gas temperature, reducing output pressure fluctuations across varying environmental temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple gas discharge ports with different open areas are used to control output pressure, then output pressure stability is improved, but device complexity increases
Solution Approach 1:
The gas discharge system is segmented into multiple port groups (first, second, third port groups) with different open areas, where each group opens at different internal pressures. This segmentation allows progressive gas discharge as pressure increases, stabilizing output pressure across varying environmental temperatures without requiring complex control mechanisms.
Solution Approach 2:
Different regions of the housing have gas discharge ports with locally optimized properties - the first port group has larger open area for low-pressure discharge, while subsequent port groups have smaller open areas for high-pressure discharge. This local quality differentiation enables pressure-dependent gas discharge characteristics.
2Reliability
If the housing internal pressure is increased during high temperature combustion to maintain output pressure, then output pressure stability is improved, but the burning rate of gas generating agent accelerates excessively
Solution Approach 1:
The gas discharge system dynamically adapts to internal pressure changes by progressively opening different port groups at different pressure thresholds. During high-temperature combustion, as internal pressure rises, the system transitions from the first port group to subsequent port groups, dynamically regulating gas discharge to prevent excessive burning rate acceleration while maintaining output pressure stability.
Solution Approach 2:
The system changes the discharge parameter (open area) based on internal pressure conditions. At low internal pressure, the first port group with larger open area is used; at high internal pressure, subsequent port groups with smaller open areas are used. This parameter change prevents excessive burning rate acceleration during high-temperature combustion.
3Reliability
If a cooling member is added to cover the highest pressure port group, then output pressure stability is improved, but device complexity increases
Solution Approach 1:
A cooling member is introduced as an intermediary element that covers the third gas discharge port group (opened at highest internal pressure). This cooling member mediates between the high-temperature combustion gas and the external environment, cooling the discharged gas to prevent excessive temperature effects while maintaining output pressure 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 design stabilizes output pressure by controlling the total open area of gas discharge ports and cooling the combustion gas, thereby reducing the impact of temperature variations on gas generator performance, enhancing the reliability of airbag systems and reducing the load on airbags.
Implementation Method 1
at least the gas discharge port group or the gas discharge port that is opened by the highest pressure is covered with a cooling member from the outside
Implementation Method 2
a gas generating agent ignited and burnt by activation of the ignition device to generate combustion gas
Data Source
AI summary
A gas generator includes, a housing having a gas discharge port closed, from the inside thereof, by a closing member; an ignition device accommodated inside the housing; and a gas generating agent ignited and burnt by activation of the ignition device to generate combustion gas. The gas discharge port includes a plurality of gas discharge port groups or a plurality of gas discharge ports, the plurality of gas discharge port groups or the plurality of gas discharge ports are opened by different pressures, respectively, and among the plurality of gas discharge port groups or the plurality of gas discharge ports, at least the gas discharge port group or the gas discharge port that is opened by higher pressure is covered with a cooling member from the outside.