Evacuation Slide Inflation Control With Pressure Switch Feedback
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Solution Overview
Problem
Existing inflatable evacuation systems face challenges in efficiently controlling inflation due to variations in ambient temperature and gas supply, often requiring excess gas storage and pressure relief valves, which can lead to inefficiencies and increased complexity.
Innovation Solution
An inflation control system comprising a solenoid valve, pressure switch, and control circuit that manages the flow of gas to the inflatable device, using a mechanical or electronic pressure switch to regulate pressure and reduce the need for excess gas storage and pressure relief valves, allowing for precise control of inflation based on ambient temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excess gas is stored in the cylinder to account for temperature variations and ensure complete inflation, then inflation reliability is improved, but system weight and gas quantity increase
Solution Approach 1:
The patent implements a feedback control system using a pressure sensor to monitor inflation pressure in real-time and adjust the solenoid valve accordingly. This closed-loop control ensures the inflatable reaches and maintains the target pressure without requiring excess gas, resolving the contradiction between reliability and gas quantity by dynamically adapting gas delivery based on actual pressure conditions.
Solution Approach 2:
The system changes the operating parameters of gas delivery by using a solenoid valve with PWM (pulse-width modulation) control to precisely regulate gas flow rate and duration. By adjusting these parameters based on temperature compensation algorithms and real-time pressure feedback, the system delivers exactly the required gas amount without waste, eliminating the need to store excess gas.
2Reliability
If pressure relief valves are installed to vent excess gas, then inflation pressure control is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical pressure relief valves with an electronically controlled solenoid valve system. The solenoid valve, controlled by microcontroller-based logic circuitry, electronically regulates pressure by modulating gas flow based on feedback from pressure sensors. This substitution eliminates the need for mechanical relief valves and their associated complex pressure regulation mechanisms, reducing overall device complexity while maintaining or improving pressure control accuracy.
Solution Approach 2:
The control system performs self-regulation of inflation pressure through feedback control, eliminating the need for separate pressure relief valves. The system monitors its own pressure state and automatically adjusts gas delivery to maintain target pressure, making the pressure relief function redundant and allowing removal of associated hardware, thereby simplifying the device.
3Loss of time
If fast inflation is achieved by opening the main inflation valve quickly, then evacuation time is reduced, but gas flow control precision decreases
Solution Approach 1:
The patent employs periodic pulsed gas delivery through the solenoid valve rather than continuous flow. The control system delivers gas in controlled pulses at optimized intervals, achieving rapid inflation while maintaining precise pressure control. This periodic action allows the system to reach target pressure quickly without overshooting, resolving the contradiction between fast inflation and pressure precision by using time-discretized gas delivery with feedback adjustment.
Solution Approach 2:
The system dynamically adjusts the solenoid valve opening duration and frequency based on real-time pressure feedback and inflation stage. During early inflation, the valve opens wider and more frequently for rapid pressure buildup; as target pressure approaches, the system reduces valve opening duration and frequency to precisely reach the target. This dynamic adaptation enables both fast inflation and precise pressure control throughout the inflation process.
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 efficient and controlled inflation of inflatable devices, reducing weight and complexity, eliminating the need for excess gas storage and pressure relief valves, while providing reliable and long-lasting operation with reduced maintenance efforts.
Implementation Method 1
a solenoid valve connected to the compressed fluid source and configured to control a flow of gas to the inflatable device
Implementation Method 2
a pressure switch configured to open and de-energize the solenoid valve in response to being exposed to a pressure at or exceeding a pressure threshold
Data Source
AI summary
An inflation control system for an inflatable device may comprise: a compressed fluid source; a solenoid valve connected to the compressed fluid source and configured to control a flow of gas to the inflatable device; and a control circuit comprising a power source, a pressure switch, and an electrical switch, the control circuit configured to energize, via the power source, the solenoid valve in response to both the pressure switch and the electrical switch being in a closed state, the pressure switch configured to open and de-energize the solenoid valve in response to being exposed to a pressure at or exceeding a pressure threshold.