KR20140051576A - Method for checking leak of fuel in fuel tank - Google Patents

Method for checking leak of fuel in fuel tank Download PDF

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Publication number
KR20140051576A
KR20140051576A KR1020120117769A KR20120117769A KR20140051576A KR 20140051576 A KR20140051576 A KR 20140051576A KR 1020120117769 A KR1020120117769 A KR 1020120117769A KR 20120117769 A KR20120117769 A KR 20120117769A KR 20140051576 A KR20140051576 A KR 20140051576A
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KR
South Korea
Prior art keywords
fuel tank
fuel
valve
pressure
internal pressure
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Application number
KR1020120117769A
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Korean (ko)
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KR101978138B1 (en
Inventor
김종문
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콘티넨탈 오토모티브 시스템 주식회사
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Priority to KR1020120117769A priority Critical patent/KR101978138B1/en
Publication of KR20140051576A publication Critical patent/KR20140051576A/en
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Publication of KR101978138B1 publication Critical patent/KR101978138B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0809—Judging failure of purge control system
    • F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/225—Leakage detection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The present invention relates to a device for detecting a fuel leak from a fuel tank by opening and closing a purge valve formed on a flow passage to an engine from a canister and a blocking valve which is formed on a flow passage to the air from the canister. The device for detecting a fuel leak from the fuel tank includes a first step which forms the inner pressure of the fuel tank lower than air pressure by opening the purge valve and closing the blocking valve when an engine is driving; a second step which increases the inner pressure of the fuel tank by closing the purge valve and opening the blocking valve when the inner pressure of the fuel tank is lower than preset first pressure after the engine stops; a third step which lowers the inner pressure of the fuel tank by maintaining the opened state of the purge valve and closes the blocking valve again when the inner pressure of the fuel tank is higher than preset second pressure; and a fourth step which detects the fuel leak from the fuel tank based on a grade which the inner pressure of the fuel tank is increased while maintaining the inner pressure of the fuel tank within a predetermined range by repeating the second and third steps. The device for detecting a fuel leak from the fuel tank controls the inner pressure of the fuel tank by using the blocking valve, thereby continuously detecting a fuel leak even though the purge valve is not operated because of a stop of the engine.

Description

METHOD FOR CHECKING LEAK OF FUEL IN FUEL TANK < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for confirming whether or not a fuel is leaked in a fuel tank, and more particularly, to a method for checking whether a fuel leak occurs in a fuel tank, .

Recently, as the industry has developed, the number of vehicles has surged, and the exhaust gas emitted from the vehicles has become a main cause of environmental pollution. In order to reduce the environmental pollution, countries have established regulations to reduce the amount of exhaust gas from vehicles. For example, there is the Automobile Emission Regulation (OBD-ii) regulated in California, USA.

Many of these regulatory measures are required to diagnose the failure of the system in the vehicle, which affects the increase of the exhaust gas of the vehicle. One of them is to confirm whether or not the fuel leak in the fuel tank, and various methods Is being developed.

However, most of the conventional methods for checking whether or not the fuel is leaked in the fuel tank are made to constantly maintain the internal pressure of the fuel tank only through opening and closing of the purge valve provided in the flow path from the canister to the engine. There has been a problem that the fuel leakage can not be continuously checked since it is not operated.

A technical object of the present invention is to provide a method of confirming whether or not fuel leakage occurs in a fuel tank in which fuel leakage can be continuously checked even when the engine is turned off.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

According to another aspect of the present invention, there is provided a method for checking whether fuel leaks in a fuel tank according to the present invention is accomplished by a purge valve provided in a flow path from a canister to an engine, Wherein the purge valve is opened while the engine is running and the shutoff valve is closed so that the internal pressure of the fuel tank is lower than the atmospheric pressure, Stage 1; A second step of increasing the internal pressure of the fuel tank by closing the purge valve and opening the shutoff valve when the internal pressure of the fuel tank is lower than a predetermined first pressure after the engine is stopped; Wherein when the internal pressure of the fuel tank increased through the second step is higher than a predetermined second pressure, the purge valve maintains the closed state and the shutoff valve is closed again to lower the internal pressure of the fuel tank Step 3; And repeating the second step and the third step to determine whether the fuel leak in the fuel tank is leaking from a slope in which the internal pressure of the fuel tank rises while maintaining the internal pressure of the fuel tank within a predetermined range And a fourth step.

The shut-off valve includes a first valve mounted on a flow path from the canister to the atmosphere, and a second valve mounted on a separate flow path branched from the canister and the first valve, 2 < / RTI > valve.

At this time, the second valve may be a check valve that opens if the internal pressure of the fuel tank is lower than the first pressure.

According to the method for checking the fuel leakage in the fuel tank according to the present invention, since the internal pressure of the fuel tank is adjusted by using the shutoff valve, even if the engine start is turned off and the purge valve is not operated, .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram schematically showing a fuel system for explaining a method for checking fuel leakage in a fuel tank according to the present invention. FIG.
FIG. 2 is a flowchart showing an embodiment of a method for checking whether or not a fuel is leaking in a fuel tank according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a fuel system for explaining a method for checking fuel leakage in a fuel tank according to the present invention, A method for confirming whether or not fuel leaks in a fuel tank according to the present invention is confirmed.

As shown in FIGS. 1 and 2, an embodiment of a method for checking fuel leakage in a fuel tank according to the present invention includes a first step (S100) to a fourth step (S400).

Here, the radix preceded by each step, such as "first" and "fourth", is for the purpose of distinguishing each step only, not for the purpose of indicating a time series order, Not to mention.

The first step S100 is a step of opening the purge valve 40 and closing the shutoff valve 50 while the engine 30 is driving to make the internal pressure of the fuel tank 10 lower than the atmospheric pressure.

It is needless to say that the first step S100 may be performed in various processes by forming the internal pressure of the fuel tank 10 lower than the atmospheric pressure. However, for the sake of more detailed explanation, for example, the following will be described with reference to FIG.

That is, the first step S100 is a step S120 of opening the purge valve 40 and opening the shutoff valve 50 after the step S110 of confirming whether or not the leak diagnosis condition is satisfied (S120) of opening the purge valve (40) and opening the shutoff valve (50) by checking whether the internal pressure of the fuel tank (10) is lower than the atmospheric pressure or not (S130) may be performed.

Here, the leak diagnosis condition is a condition for confirming the surrounding situation so as not to cause an error in checking whether or not the fuel is leaked from the fuel tank 10, to what degree the fuel is leaked from the fuel tank 10 It can be variously determined according to the setting of the user.

When the first step S100 proceeds, the internal pressure of the fuel tank 10 is made lower than the atmospheric pressure. By using the pressure gradient formed in the fuel tank 10, Fuel leakage can be diagnosed.

If the internal pressure of the fuel tank 10 is lower than the predetermined first pressure after the engine 30 is stopped, the purge valve 40 is closed and the shutoff valve 50 is closed, So that the internal pressure of the fuel tank 10 is increased.

The limitation after the engine 30 is stopped is that when the fuel is moved from the fuel tank 10 to the engine 30 due to the fuel combustion in the engine 30, Can not be accurately judged.

The predetermined first pressure is a minimum pressure for forming a pressure gradient in the fuel tank 10 so as to confirm whether or not the fuel is leaking. The predetermined first pressure may vary depending on the specifications of the fuel tank 10 and the user's setting. .

That is, in the second step S200, the internal pressure of the fuel tank 10 is kept constant at a minimum pressure that can determine whether the fuel is leaking. For example, The purge valve 40 is closed and the shutoff valve 50 is closed when the internal pressure of the fuel tank 10 is lower than the preset first pressure. And increasing the internal pressure of the fuel tank 10 (S220).

Meanwhile, in the third step S300, if the internal pressure of the fuel tank 10 increased through the second step S200 is higher than the predetermined second pressure, the purge valve 40 is kept closed, The valve 50 is closed again to lower the internal pressure of the fuel tank 10.

At this time, the predetermined second pressure is set to a value that allows to prevent damage to the fuel system including the fuel tank 10, which may occur due to an excessive increase in the internal pressure of the fuel tank 10 in confirming the fuel leakage The first pressure can be variously determined according to the specification of the fuel tank 10 and the setting of the user.

That is, the third step S300 is a step of maintaining the internal pressure of the fuel tank 10 constant at a maximum pressure at which fuel leakage can be determined. For example, in the fuel tank 10, If the internal pressure of the fuel tank 10 is higher than the predetermined second pressure, the purge valve 40 is still closed and only the shutoff valve 50 is closed (S320) of increasing the internal pressure of the fuel tank (10) by closing it again.

As described above, the second step (S200) and the third step (S300) are the same as the first embodiment in that the internal pressure of the fuel tank 10 is adjusted by opening and closing the shutoff valve 50 instead of the purge valve 40 And is clearly distinguished from the conventional method for determining whether or not the fuel is leaked as described in the background of the invention.

That is, in the conventional method of determining whether or not the fuel is leaking, the internal pressure of the fuel tank 10 is adjusted only by the purge valve 40, and the shutoff valve 50 has a problem in that it determines only the inflow of air. The present invention may be said to solve the problem by positively utilizing not only the purge valve 40 but also the shutoff valve 50 to adjust the internal pressure of the fuel tank 10. [

Considering the features of the present invention, the design change of the shutoff valve 50 may be considered as follows. Needless to say, design change of the shut-off valve 50 as described below naturally does not limit the scope of the right.

The shut-off valve 50 may be constituted by one valve that actively determines the inflow and outflow of air as described above in consideration of the internal pressure of the fuel tank 10, but the first valve 52 and the second valve (54) It can also be divided into two valves.

Here, the first valve 52 is mounted on the flow path toward the atmosphere from the canister 20, and only takes charge of the inflow of air. The second valve 54 is connected to the canister 20 and the first valve 52, Which is provided on a separate flow path branched from the flow passage toward the atmosphere from the canister 20 to control the internal pressure of the fuel tank 10.

The first valve 52 and the second valve 54 may have any structure as long as they can play the roles as described above. For example, the second valve 54 may be a check valve that opens when the internal pressure of the fuel tank 10 is lower than a predetermined first pressure.

In the fourth step S400, the second step S200 and the third step S300 are repeated to maintain the internal pressure of the fuel tank 10 within a predetermined range, while the internal pressure of the fuel tank 10 And determines whether the fuel tank 10 has leaked from the rising inclination.

More specifically, the fourth step S400 is a process of determining whether the internal pressure of the fuel tank 10 in the second step S200 described above is smaller than a predetermined first pressure (S210) If it is ascertained that the internal pressure of the fuel tank 10 is larger than the preset first pressure, it is determined whether or not the fuel tank 10 is leaked.

In the fourth step S400, it is determined whether the internal pressure of the fuel tank 10 is greater than a predetermined second pressure in the third step S300, It is determined whether or not the fuel tank 10 is leaking fuel.

However, in the fourth step S400, it is determined that the internal pressure of the fuel tank 10 is higher than the predetermined second pressure in the process of checking whether the internal pressure of the fuel tank 10 is higher than the preset second pressure The second step S200 and the third step S300 are repeated to maintain the internal pressure of the fuel tank 10 within a predetermined range.

At this time, the second step S200 and the third step S300 can be naturally repeated in the fourth step S400 according to the internal pressure change rate of the fuel tank 10, 52 and the second valve 54 may be appropriately adjusted to allow the user to set the progress speed of the fourth step S400 to some extent.

In the fourth step S400, it is determined whether or not the fuel tank 10 is leaking from the slope at which the internal pressure of the fuel tank 10 is increased. If it is found that the slope of the fuel tank 10 is suddenly changed, ) Will be judged to be leaking fuel.

According to the embodiment of the method for confirming the fuel leakage in the fuel tank according to the present invention having the structure as described above, the purge valve 40 is connected to the shutoff valve 50 so that the fuel leakage in the fuel tank 10 It is possible to continue checking even if the engine is turned off.

Accordingly, as described in the background of the present invention, even if the engine is turned off while the vehicle is stopped, such as a hybrid vehicle or an idle stop and go vehicle, the fuel leakage of the fuel tank 10 can be checked will be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, such modifications or variations should not be individually understood from the technical spirit and viewpoint of the present invention, and modified embodiments should be included in the claims of the present invention.

10: Fuel tank
20: Canister
30: engine
40: purge valve
50: Isolation valve
52: first valve 54: second valve

Claims (3)

1. A method for checking fuel leakage in a fuel tank through a purge valve provided in a flow path from a canister to an engine and a shutoff valve provided in a flow path toward the atmosphere in the canister,
A first step of opening the purge valve and closing the shutoff valve while the engine is running to form an internal pressure of the fuel tank lower than an atmospheric pressure;
A second step of increasing the internal pressure of the fuel tank by closing the purge valve and opening the shutoff valve when the internal pressure of the fuel tank is lower than a predetermined first pressure after the engine is stopped;
Wherein when the internal pressure of the fuel tank increased through the second step is higher than a predetermined second pressure, the purge valve maintains the closed state and the shutoff valve is closed again to lower the internal pressure of the fuel tank Step 3; And
Wherein the control unit repeatedly performs the second step and the third step to maintain the internal pressure of the fuel tank within a predetermined range to determine whether the fuel leaks in the fuel tank from a slope in which the internal pressure of the fuel tank rises, Including four steps,
A method for checking whether fuel leaks in a fuel tank.
The method according to claim 1,
The shut-
A first valve mounted on a flow path from the canister to the atmosphere,
And a second valve mounted between the canister and the first valve on a separate flow path branched from the flow path toward the atmosphere in the canister.
A method for checking whether fuel leaks in a fuel tank.
3. The method of claim 2,
Wherein the second valve comprises:
Wherein the check valve is opened when the internal pressure of the fuel tank is lower than the first pressure.
A method for checking whether fuel leaks in a fuel tank.
KR1020120117769A 2012-10-23 2012-10-23 Method for checking leak of fuel in fuel tank KR101978138B1 (en)

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Application Number Priority Date Filing Date Title
KR1020120117769A KR101978138B1 (en) 2012-10-23 2012-10-23 Method for checking leak of fuel in fuel tank

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KR101978138B1 KR101978138B1 (en) 2019-05-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101602069B1 (en) * 2014-12-11 2016-03-10 현대오트론 주식회사 Method for diagnosing leakage of fuel tank of vehicle
KR20200053597A (en) * 2017-09-21 2020-05-18 비테스코 테크놀로지스 게엠베하 Method and apparatus for controlling the tank ventilation valve connected to the intake pipe of the turbocharging internal combustion engine through two flush lines

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020090331A (en) * 2001-05-25 2002-12-02 미쯔비시 지도샤 고교 가부시끼가이샤 Failure diagnostic system of evaporated fuel processing system
KR20050071098A (en) * 2003-12-31 2005-07-07 현대자동차주식회사 Canister for automobile
KR20070061698A (en) * 2005-12-10 2007-06-14 현대자동차주식회사 Apparatus for leakage diagnosis of evaporated gsa on vehicle and method thereof
KR100736543B1 (en) * 2006-10-31 2007-07-06 지멘스 오토모티브 주식회사 Method for diagnosising error detction and healing in vehicle tank system
KR20100059018A (en) * 2008-11-25 2010-06-04 콘티넨탈 오토모티브 시스템 주식회사 Method for diagnosing leakage of fuel tank of hybrid vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020090331A (en) * 2001-05-25 2002-12-02 미쯔비시 지도샤 고교 가부시끼가이샤 Failure diagnostic system of evaporated fuel processing system
KR20050071098A (en) * 2003-12-31 2005-07-07 현대자동차주식회사 Canister for automobile
KR20070061698A (en) * 2005-12-10 2007-06-14 현대자동차주식회사 Apparatus for leakage diagnosis of evaporated gsa on vehicle and method thereof
KR100736543B1 (en) * 2006-10-31 2007-07-06 지멘스 오토모티브 주식회사 Method for diagnosising error detction and healing in vehicle tank system
KR20100059018A (en) * 2008-11-25 2010-06-04 콘티넨탈 오토모티브 시스템 주식회사 Method for diagnosing leakage of fuel tank of hybrid vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101602069B1 (en) * 2014-12-11 2016-03-10 현대오트론 주식회사 Method for diagnosing leakage of fuel tank of vehicle
KR20200053597A (en) * 2017-09-21 2020-05-18 비테스코 테크놀로지스 게엠베하 Method and apparatus for controlling the tank ventilation valve connected to the intake pipe of the turbocharging internal combustion engine through two flush lines

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