Fuel Nozzle Shut-Off Control With Evaporation Gas Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fuel pump nozzles tend to shut off prematurely during refueling in high-temperature environments due to condensation of evaporation gases blocking air inflow through the venturi port, preventing the negative pressure from being relieved, which leads to incomplete fueling.
Innovation Solution
A system comprising a fuel evaporation gas blocking unit on the filler pipe to separate external air and evaporation gas spaces, an external air suction jet pump, and a jet pump connection hose to ensure continuous air flow and prevent premature shut-off, including a retainer with external air and evaporation gas venting holes, and a premature shut-off prevention valve to control fuel inlet opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the venturi port is used to relieve negative pressure during refueling, then the fuel pump nozzle can operate continuously, but in high-temperature environments evaporation gas condenses in the venturi port and blocks air inflow causing premature shut-off
Solution Approach 1:
The venturi port assembly is segmented into separate functional zones: a first space for air intake and a second space for evaporation gas discharge. The partition wall divides these spaces, preventing condensed evaporation gas from blocking the air intake path while maintaining the negative pressure relief function.
Solution Approach 2:
The harmful function of evaporation gas condensation is extracted and isolated from the air intake path. The partition wall separates the evaporation gas discharge function from the air suction function, removing the blocking effect on air flow while preserving the venturi port's pressure relief capability.
2Productivity
If the fuel tank is fully charged, then refueling should stop, but evaporation gas condensation causes premature shut-off before the tank is full
Solution Approach 1:
The space around the fuel injection part is segmented into a first space (air intake) and a second space (evaporation gas discharge) separated by a partition wall. This ensures that evaporation gas condensation in the second space does not affect air flow through the venturi port in the first space, maintaining accurate shut-off detection.
Solution Approach 2:
The partition wall acts as an intermediary structure that separates the air intake path from the evaporation gas discharge path. It prevents direct contact between condensed evaporation gas and the air flow, ensuring that the venturi port continues to function properly for shut-off detection.
3Duration of action of moving object
If external air flows through the venturi port to relieve negative pressure, then the fuel pump nozzle remains open, but evaporation gas blocks this air flow causing premature shut-off
Solution Approach 1:
The outer side space of the fuel injection part is divided into a first space for air intake and a second space for evaporation gas discharge, separated by a partition wall. This segmentation ensures that evaporation gas condensation does not reduce the air flow quantity through the venturi port, maintaining fuel discharge duration.
Solution Approach 2:
The evaporation gas discharge function is extracted and separated from the air intake path. By providing a dedicated second space for evaporation gas discharge away from the venturi port, the air flow quantity through the venturi port is protected from blockage, maintaining continuous fuel discharge.
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
Prevents premature shut-off of the fuel pump nozzle until the fuel tank is fully charged, ensuring complete fueling regardless of environmental conditions by maintaining air flow and relieving negative pressure effectively.
Implementation Method 1
an external air suction jet pump mounted at an inside of the fuel tank and configured to suck external air thereinto and discharge the external air into an inside of the fuel tank, by receiving a portion of fuel transmitted from a fuel pump in the fuel tank as a working fluid
Implementation Method 2
The fuel pump nozzle detects a full charge of the fuel tank using the negative pressure formed therein when the fuel is discharged
Data Source
AI summary
A system for controlling shut-off of a fuel pump nozzle in a fuel tank includes: a fuel evaporation gas blocking unit configured to separate an outer space of a fuel injection part of the fuel pump nozzle inserted inside the filler pipe into a first space into which external air is introduced and a second space into which fuel evaporation gas that is discharged from the fuel tank is introduced and to block the evaporation gas from being introduced into the first space; an external air suction jet pump mounted in the fuel tank and configured to suck external air thereinto and discharge the external air into the fuel tank, by receiving a portion of fuel transmitted from the fuel pump in the fuel tank as a working fluid; and a jet pump connection hose configured to connect the first space and the external air suction jet pump.