Fuel Supply Device Variable Valve Pressure-Dependent Vapor Control
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Solution Overview
Problem
Existing fuel supplying devices fail to prevent the discharge of evaporated fuel vapor from the fuel refueling port into the atmosphere when the internal pressure of the fuel tank is high, particularly under conditions other than those regulated.
Innovation Solution
A fuel supplying device with a variable valve and an air-passage flow path inner diameter changing mechanism that adjusts the inner diameter of the air-passage flow path based on the internal pressure of the fuel tank, reducing the circulated amount of evaporated fuel vapor and preventing its discharge into the atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the opening surface area of the valve is increased to allow more evaporated fuel vapor to pass, then the circulated amount of evaporated fuel vapor increases under regulated conditions, but evaporated fuel vapor is discharged into the atmosphere under unregulated conditions when internal pressure is high
Solution Approach 1:
The patent applies the dynamics principle by making the air-passage flow path inner diameter variable rather than fixed. The inner diameter changes dynamically in response to fuel tank internal pressure, being smaller when pressure is high and larger when pressure is low. This dynamic adjustment allows the system to adapt to different operating conditions, preventing vapor discharge during high-pressure refueling while maintaining adequate circulation during normal operation.
Solution Approach 2:
The patent implements parameter changes by modifying the physical dimension of the air-passage flow path (inner diameter) based on the internal pressure parameter of the fuel tank. When the internal pressure reaches or exceeds a predetermined value, the inner diameter is reduced to limit the circulated amount of evaporated fuel vapor, thereby preventing atmospheric discharge while still allowing vapor circulation under normal pressure conditions.
2Device complexity
If a fixed opening surface area valve is used, then the device structure is simple, but it cannot adapt to varying internal pressure conditions and allows vapor discharge when pressure is high
Solution Approach 1:
The patent transforms the static valve structure into a dynamic one where the air-passage flow path inner diameter can change. This dynamic capability enables the valve to automatically adapt to varying internal pressure conditions without requiring complex external control systems, achieving reliable prevention of vapor discharge through structural responsiveness to pressure changes.
Solution Approach 2:
The valve structure serves itself by using the fuel tank's internal pressure to automatically control the air-passage flow path inner diameter. The system self-regulates the vapor circulation based on the actual pressure conditions within the fuel tank, eliminating the need for external sensors or control mechanisms while ensuring reliable operation.
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 reduces the discharge of evaporated fuel vapor into the atmosphere by adjusting the air-passage flow path diameter in response to varying internal pressures, enhancing compliance with regulatory conditions and minimizing environmental emissions.
Implementation Method 1
an air-passage flow path inner diameter changing means that is provided at the variable valve, and that is for changing an inner diameter of an air-passage flow path, through which the evaporated fuel vapor flows, in accordance with an internal pressure of the fuel tank
Implementation Method 2
a circulation flow path that is connected to the interior of the fuel tank and to a fuel refueling port side, and that circulates evaporated fuel vapor that is within the fuel tank to the fuel refueling port side
Data Source
AI summary
A fuel tank supplying device includes: a fuel tank that can accommodate fuel at an interior; a circulation flow path that is connected to an interior of the fuel tank and a fuel refueling port side, and that circulates evaporated fuel vapor that is within the fuel tank to the fuel refueling port side; a variable valve that is provided on the circulation flow path, and adjusts a circulated amount of the evaporated fuel vapor; and air-passage flow path inner diameter changing means that is provided at the variable valve, and that is for changing an inner diameter of a air-passage flow path, through which the evaporated fuel vapor flows, in accordance with internal pressure of the fuel tank, and that, when the internal pressure of the fuel tank is equal to or greater than a predetermined value, makes the inner diameter of the air-passage flow path smaller.