Boiling Detection in Sealed Vessels via Pressure Derivative Analysis
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Solution Overview
Problem
Existing sealed liquid tanks, such as fuel tanks in vehicles, face challenges in controlling pressure due to temperature fluctuations and the need to prevent vapor contamination, which can lead to damage from excessive pressure or vacuum.
Innovation Solution
A method for pressure control in sealed tanks that includes detecting boiling by measuring the time-based derivative of pressure changes, emitting alerts, and adjusting the isolation valve to maintain pressure within safe limits, while also monitoring and regulating pressure to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the tank is sealed to prevent vapor contamination, then vapor loss is reduced, but pressure control becomes more difficult
Solution Approach 1:
The system performs preliminary detection of boiling conditions by measuring pressure derivatives before actual boiling occurs. This allows the control system to prepare and take preventive actions (adjusting valves, activating cooling) before the boiling state develops, thereby maintaining the sealed configuration while preventing pressure excursions.
Solution Approach 2:
The system continuously monitors pressure and its time-based derivative, creating a feedback loop that detects boiling conditions in real-time. This feedback enables dynamic adjustment of pressure control mechanisms while maintaining the sealed tank configuration, resolving the contradiction between sealing and pressure control.
2Ease of operation
If passive venting is used to control pressure, then pressure control is simple, but vapor contamination of the environment occurs
Solution Approach 1:
The system replaces passive mechanical venting with an active detection and control system that uses pressure derivative measurement and electronic control. This substitution eliminates the need for physical venting while maintaining pressure control, thereby preventing vapor contamination while preserving ease of operation through automated control.
Solution Approach 2:
The system uses the tank's own pressure measurements and their derivatives to detect boiling conditions and trigger appropriate responses. This self-service approach eliminates the need for external venting systems while maintaining pressure control, preventing vapor release into the environment.
3Object-generated harmful factors
If active pressure control is implemented, then vapor contamination is prevented, but device complexity increases
Solution Approach 1:
By detecting boiling conditions through pressure derivative measurement before actual boiling occurs, the system can take preventive actions while the tank remains sealed. This preliminary detection approach prevents vapor contamination while avoiding the need for complex emergency response systems.
4Device complexity
If boiling is not detected, then the system operates simply, but pressure can rise dangerously
Solution Approach 1:
The system replaces complex multi-sensor boiling detection with a simplified approach using pressure derivative calculation from standard pressure measurements. This substitution maintains high reliability for detecting boiling conditions and ensuring pressure safety while minimizing device complexity through mathematical processing of existing sensor data.
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
Effectively detects boiling and maintains pressure within safe limits, preventing tank damage and reducing vapor contamination by actively managing pressure through the isolation valve and filter regeneration.
Implementation Method 1
measurement of a time-based derivative of the pressure curve in the tank
Data Source
AI summary
Disclosed is a method for monitoring pressure, for a vessel assembly including a sealed vessel capable of holding a liquid, a filter capable of capturing vapors from the liquid, a pipe connecting the vessel to the filter, and an isolation valve arranged to selectively shut off the pipe, including a detection of the boiling of the liquid contained in the vessel.