Fuel Tank Vent Valve Control During Refueling Pressure Drop
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Solution Overview
Problem
Existing fuel tank systems face challenges in maintaining a balanced flow rate between the circulation line and the drain line due to component deterioration and performance variations, making it difficult to comply with vaporized gas discharge regulations during refueling.
Innovation Solution
A fuel tank processing apparatus with a discharge path, solenoid valve, and calculation controller that adjusts the valve's opening degree based on changes in fuel tank internal pressure to maintain balanced gas flow, using a pressure drop estimation method to ensure smooth refueling and compliance with regulatory gas discharge limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the opening degree of the valve is fixed, then the device complexity is reduced, but the ability to maintain balanced gas flow rate between circulation line and drain line deteriorates due to component deterioration and performance variations
Solution Approach 1:
The valve opening degree is made dynamically adjustable based on detected changes in fuel tank internal pressure. The control mechanism transitions from a fixed static opening to a dynamic one that adapts to varying pressure conditions, ensuring reliable gas flow rate balance between the circulation line and drain line even as components deteriorate over time.
Solution Approach 2:
The system changes the valve opening parameter in response to detected pressure changes in the fuel tank. By monitoring internal pressure variations and adjusting the valve opening degree accordingly, the system maintains optimal gas flow distribution between circulation and drain lines despite component aging and performance variations.
2Reliability
If the valve opening degree is adjusted frequently, then the gas discharge compliance is improved, but the wear of the valve components accelerates
Solution Approach 1:
The valve opening degree is adjusted periodically or at specific intervals based on detected pressure changes rather than continuously. This periodic adjustment strategy maintains compliance with gas discharge regulations while reducing the frequency of actuation, thereby minimizing wear on valve components and extending their service life.
3Ease of manufacture
If a simple fixed valve is used, then the manufacturing cost is reduced, but the adaptability to varying refueling conditions and component deterioration deteriorates
Solution Approach 1:
The system employs a self-regulating mechanism where the valve automatically adjusts its opening degree in response to detected pressure changes without requiring complex external control systems. This self-service approach provides adaptability to varying refueling conditions and component deterioration while keeping the overall system relatively simple and cost-effective to manufacture.
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 apparatus effectively adjusts the solenoid valve opening to achieve appropriate gas discharge and circulation, ensuring compliance with gas discharge regulations while allowing smooth fuel supply, even with deteriorated or varying component performance.
Implementation Method 1
the calculation controller is configured to estimate a pressure drop in the discharge path based on the change in condition
Implementation Method 2
The valve is disposed in the discharge path. The calculation controller is configured to adjust an opening degree of the valve... based on a change in condition that occurs when an internal pressure of the fuel tank is reduced
Data Source
AI summary
A fuel tank processing apparatus including a discharge path, a valve, and a calculation controller. Gas discharged from a fuel tank is to flow through the discharge path. The valve is disposed in the discharge path. The calculation controller is configured to adjust an opening degree of the valve. The calculation controller is configured to adjust the opening degree of the valve during supplying of fuel to the fuel tank based on a change in condition that occurs when an internal pressure of the fuel tank is reduced.