Temperature-Compensated Valve Timing for Inflatable Evacuation Slide Inflation
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Solution Overview
Problem
Inflatable evacuation systems face inefficiencies due to variations in gas volume needed for inflation at different temperatures, leading to over-inflation issues and increased manufacturing and maintenance requirements from the use of pressure relief valves and sensors.
Innovation Solution
An inflation control system that includes a temperature sensor, a valve module, and a controller to determine the open-valve time based on ambient temperature measurements, optimizing gas flow to achieve desired pressure without over-inflation, eliminating the need for pressure relief valves and reducing maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a greater volume of gas is provided to the inflatable at low temperatures to achieve desired pressure, then the desired pressure is achieved, but over-inflation occurs at higher temperatures leading to wasted gas and potential damage
Solution Approach 1:
The system performs preliminary measurement of ambient temperature before inflation and pre-calculates the appropriate gas volume and valve open-time based on temperature-compensated algorithms. This preliminary action allows the system to adjust the inflation parameters in advance, preventing both under-inflation at low temperatures and over-inflation at high temperatures.
Solution Approach 2:
The system incorporates pressure sensors and temperature sensors that continuously monitor the inflation process and ambient conditions. The controller receives feedback from these sensors and dynamically adjusts the valve open-time and gas flow rate to maintain the desired pressure, preventing over-inflation while ensuring adequate pressure at all temperatures.
2Reliability
If pressure relief valves and sensors are added to control inflation pressure, then over-inflation is prevented, but manufacturing complexity and maintenance requirements increase
Solution Approach 1:
The system extracts the pressure control function from mechanical pressure relief valves and transfers it to an electronic control system. By removing the need for PRVs and complex sensor assemblies, the design simplifies the overall system while maintaining reliable pressure control through electronic valve modulation based on temperature and pressure feedback.
Solution Approach 2:
The system replaces mechanical pressure relief valves with an electronically controlled valve system. Instead of using mechanical springs and diaphragms to relieve excess pressure, the system uses an electronic controller that modulates the valve open-time based on temperature-compensated algorithms and pressure sensor feedback, eliminating complex mechanical components.
3Reliability
If the gas cylinder volume is increased to ensure adequate pressure at lowest temperatures, then desired pressure is achieved at low temperatures, but the system becomes bulkier and heavier
Solution Approach 1:
The system uses dynamic control of the valve open-time based on real-time temperature measurements. Instead of providing a fixed large volume of gas, the system dynamically adjusts the duration and rate of gas flow to match the actual temperature conditions, ensuring adequate pressure at low temperatures while avoiding over-inflation at high temperatures.
Solution Approach 2:
The system changes the operational parameters of gas delivery based on temperature. By measuring ambient temperature and adjusting the valve open-time and gas flow rate accordingly, the system ensures that the correct amount of gas is delivered for each temperature condition, eliminating the need for an oversized gas cylinder.
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 ensures precise inflation control, reduces maintenance needs, and allows for a more compact and efficient inflatable design by halting excess gas flow upstream, enabling a reduction in tube diameter and fabric usage while maintaining strength.
Implementation Method 1
A temperature sensor may be configured to measure an ambient temperature and output an ambient temperature measurement
Implementation Method 2
The valve module may be configured to control a flow of gas to the inflatable
Implementation Method 3
The controller may be configured to receive the ambient temperature measurement and determine an open-valve time based on the ambient temperature measurement, the open-valve time being a duration of time the valve module is in an open position
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
An inflation control system for an inflatable may comprise a compressed fluid source (130), a valve module (160), a temperature sensor (152), and a controller (170). The valve module is connected to the compressed fluid source and configured to control a flow of gas to the inflatable. The temperature sensor measures an ambient temperature and outputs the ambient temperature measurement. The controller is operably coupled to the valve module and configured to receive the ambient temperature measurement and determine an open-valve time based on the ambient temperature measurement, the open-valve time being a duration of time the valve module is in an open position.