KR-102962227-B1 - system for controlling shut-off of fuel gun in fuel tank

KR102962227B1KR 102962227 B1KR102962227 B1KR 102962227B1KR-102962227-B1

Abstract

The present invention relates to a fuel gun shut-off control system for a fuel tank, and aims to provide a fuel gun shut-off control system for a fuel tank that fundamentally prevents the phenomenon of the fuel gun shutting off prematurely before the fuel tank is fully filled when refueling the fuel tank. Accordingly, the present invention provides a fuel gun shut-off control system for a fuel tank comprising: a fuel evaporative gas blocking unit mounted on a filler pipe of a fuel tank and configured to separate the outer space of a fuel injection part of a fuel gun inserted inside therein into a first space into which external air is introduced and a second space into which fuel evaporative gas discharged from the fuel tank is introduced, and to block the introduction of fuel evaporative gas into the first space; an external air intake jet pump mounted on the fuel tank and configured to inhale external air and discharge it into the interior of the fuel tank by receiving a portion of the fuel discharged from a fuel pump inside the fuel tank as a working fluid; and a jet pump connecting hose connecting the first space and the external air intake jet pump to enable the flow of external air.

Inventors

김근수
김동현
박정훈

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260507
Application Date: 20211005

Claims (16)

A fuel vapor blocking unit configured to be mounted on the filler pipe of a fuel tank, and to separate the outer space of the fuel injection part of a fuel gun inserted therein into a first space into which external air is introduced and a second space into which fuel vapor discharged from the fuel tank is introduced, and to block the introduction of fuel vapor into the first space; An external air intake jet pump mounted on the fuel tank and configured to inhale external air and discharge it into the interior of the fuel tank by receiving a portion of the fuel discharged from the fuel pump inside the fuel tank as a working fluid; and A jet pump connecting hose that connects the first space and the external air intake jet pump to allow the flow of external air; A fuel tank dispensing gun shut-off control system including
In claim 1, A fuel tank fuel gun shut-off control system characterized by the fuel pump being driven when refueling the fuel tank to send fuel to the external air intake jet pump.
In claim 2, A fuel tank fuel gun shut-off control system characterized in that the above-mentioned external air intake jet pump is connected to a relief valve provided in the fuel pump to enable fuel flow, and the fuel pump is driven to open the relief valve when the fueling switch is operated.
In claim 3, A fuel tank fuel gun shut-off control system characterized by having a check valve installed at the rear end of the jet pump connecting hose, and the check valve opening when the relief valve is opened.
In claim 1, The above fuel vapor blocking unit is: A retainer mounted on the inner side of the filler pipe, and having, based on the fuel injection direction of the filler pipe, an external air intake hole for inhaling external air and an evaporative gas venting hole for discharging fuel evaporative gas on its upper side, and an opening formed on its lower side that communicates with the external air intake hole and opens the venturi port of the fuel injection part; A partition provided on the outer surface of the retainer, configured to hermetically surround the first space communicating with the external air intake hole and the opening in the space between the inner surface of the filler pipe and the outer surface of the retainer, and having a fuel inlet hole provided at its lower end; An early shut-off prevention valve assembled inside the partition, configured to close the fuel inlet hole before the fuel tank is fully filled, and to open the fuel inlet hole by fuel flowing back from the fuel tank to the filler pipe when the fuel tank is fully filled; A fuel tank fuel gun shut-off control system characterized by including
In claim 5, A fuel gun shut-off control system for a fuel tank, characterized in that the fuel gun is configured to draw in external air through the venturi port when fuel is discharged from the fuel injection part, and the venturi port communicates directly with the first space through the opening when the fuel injection part is inserted into the retainer.
In claim 5, A fuel tank fuel gun shut-off control system characterized in that the space between the inner surface of the filler pipe and the outer surface of the retainer is separated into the first space and the second space by the partition, and the second space is a space between the inner surface of the filler pipe and the outer surface of the retainer that is connected to the evaporative gas venting hole to enable the flow of fuel evaporative gas.
In claim 5, A fuel tank fuel gun shut-off control system characterized in that the first space is a space connected to the external air intake hole and opening to enable the flow of external air.
In claim 5, A fuel gun shut-off control system for a fuel tank, characterized in that a spring support plate is mounted on the inner surface of the partition, and a spring member is disposed between the spring support plate and the early shut-off prevention valve to press the early shut-off prevention valve toward the fuel inlet hole.
In claim 5, A fuel gun shut-off control system for a fuel tank, characterized in that the lower part of the above partition is provided with a valve stopper supporting the above-described early shut-off prevention valve.
In claim 9, A fuel gun shut-off control system for a fuel tank, characterized in that the spring member is compressed by the early shut-off prevention valve that moves to open the fuel inlet hole when the fuel tank is full.
In claim 5, A fuel tank fuel gun shut-off control system characterized in that the above-mentioned external air intake hole and evaporative gas venting hole are arranged to face each other with respect to the circumferential direction of the retainer.
In claim 5, A fuel tank fuel gun shut-off control system characterized by the above retainer being mounted on the inner side of the filler pipe so that its upper end is hermetically sealed against the inner circumference of the filler pipe.
In claim 5, A fuel gun shut-off control system for a fuel tank, characterized in that the retainer is provided with a fuel gun catch at its lower end, and when the end of the fuel injection part touches the fuel gun catch, the venturi port of the fuel injection part communicates directly with the first space through the opening of the retainer.
In claim 1, The above fuel tank is equipped with a leveling pipe that connects the fuel tank and the filler pipe to enable the flow of fuel vapor, and A fuel tank dispensing gun shut-off control system characterized in that the end of the leveling pipe is disposed inside the fuel tank and comes into contact with the fuel surface of the fuel tank and becomes blocked when the fuel tank is full.
In claim 5, A fuel tank fuel gun shut-off control system characterized in that the fuel injection unit is configured to stop fuel discharge when the venturi port is blocked by fuel flowing back from the fuel tank to the filler pipe.

Description

Fuel tank fuel gun shut-off control system The present invention relates to a fuel gun shut-off control system for a fuel tank, and more specifically, to a fuel gun shut-off control system for a fuel tank to prevent the phenomenon in which the fuel gun shuts off prematurely before the fuel tank is fully filled during refueling. Generally, the fuel nozzle used to refuel a vehicle's fuel tank is configured to dispense fuel when the lever is pulled and to stop dispensing fuel when the tank is full. The fuel nozzle detects the fullness of the fuel tank by utilizing the negative pressure formed inside when fuel is discharged. Before the fuel tank is full, the fuel nozzle relieves the negative pressure through air entering through the venturi port, and when the fuel tank is full, the venturi port is blocked and negative pressure is formed, thereby detecting the fullness. When the fuel tank is full, fuel flowing back through the filler pipe of the fuel tank blocks the Venturi port, and consequently, the inflow of air through the Venturi port is stopped, so the negative pressure inside the fuel gun is no longer relieved, causing the fuel gun to shut off. When the fuel nozzle operates normally, it continuously draws in air through the venturi port until the shut-off occurs. When refueling the fuel tank in a normal temperature environment, the fuel nozzle also draws in fuel vapor discharged through the leveling pipe of the fuel tank to the filler pipe through the venturi port; however, since the amount of fuel vapor discharged to the filler pipe is not large, the fuel nozzle does not shut off until the fuel tank is fully filled. However, when refueling a fuel tank in a high-temperature environment, an excess amount of fuel vapor coming out of the fuel tank's leveling pipe to the filler pipe condenses inside the relatively cold Venturi port, blocking the inflow of air. Consequently, the negative pressure inside the refueling gun is not relieved, causing the refueling gun to shut off prematurely before the fuel tank is fully filled. The premature shutdown phenomenon of the fuel nozzle described above is a problem that frequently occurs when refueling in high-temperature environments, and refueling may also become impossible if the temperature of the fuel tank is excessively high. FIG. 1 is a drawing illustrating a fuel system of a vehicle to which a fuel gun shut-off control system according to an embodiment of the present invention is applied. FIG. 2 is a drawing illustrating a part of the fuel gun shut-off control system. FIG. 3a is the view from AA of FIG. 1. FIG. 3b is the view from A'-A' in FIG. 1. FIG. 4 is a view from BB of FIG. 3a. FIG. 5 is a drawing illustrating the operating state of the fuel gun shut-off control system when the fuel tank is fully filled. FIG. 6 is a drawing illustrating the operating state of the fuel gun shut-off control system when the fuel tank is full. FIG. 7 is a flowchart illustrating the operation process of the fuel gun shut-off control system as an example. In this specification, when a part is described as "comprising" a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Additionally, terms such as "first" and/or "second" in this specification may be used to describe various components, but said components are not limited to said terms. For the sole purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. Furthermore, when it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components present in between. Conversely, when it is stated that one component is "directly connected" or "directly in contact" with another component, it should be understood that there are no other components present in between. Other expressions used to describe the relationships between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same manner. Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. The details depicted in the attached drawings are schematic drawings intended to facilitate the explanation of the embodiments of the present invention and may differ from the actual implemented form. FIG. 1 illustrates a fuel system of a vehicle to which a fuel gun shut-off control system according to an embodiment of the present invention is applied, FIG. 2 illustrates a part of the configuration of the fuel gun shut-off control system in more detail, FIG. 3a is a view taken along A-A of FIG. 1