KR102052965B1 - Method for diagnosing leakage of fuel tank of hybrid vehicle - Google Patents

Method for diagnosing leakage of fuel tank of hybrid vehicle Download PDF

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Publication number
KR102052965B1
KR102052965B1 KR1020130043659A KR20130043659A KR102052965B1 KR 102052965 B1 KR102052965 B1 KR 102052965B1 KR 1020130043659 A KR1020130043659 A KR 1020130043659A KR 20130043659 A KR20130043659 A KR 20130043659A KR 102052965 B1 KR102052965 B1 KR 102052965B1
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South Korea
Prior art keywords
fuel
pressure
fuel tank
temperature
derived
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KR1020130043659A
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Korean (ko)
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KR20140125620A (en
Inventor
김종문
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콘티넨탈 오토모티브 시스템 주식회사
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)

Abstract

The present invention discloses a fuel leakage diagnosis method of a hybrid vehicle. According to the present invention, the canister shutoff valve and the purge valve are closed-controlled when the engine is stopped while driving, and the vapor pressure in the fuel tank is derived based on the fuel temperature and the fuel pressure in the fuel tank, and the canister shutoff valve is opened after the fuel leakage diagnosis. After the temperature change and pressure change in the fuel tank are derived, the fuel leakage in the fuel tank is diagnosed on the basis of the derived pressure change and the derived vapor pressure. It is possible to prevent environmental pollution.

Description

How to diagnose fuel leakage in hybrid vehicles {METHOD FOR DIAGNOSING LEAKAGE OF FUEL TANK OF HYBRID VEHICLE}

The present invention relates to a method for diagnosing a fuel leak in a hybrid vehicle, and more particularly, to a method for enabling accurate diagnosis of fuel leakage in a fuel tank based on a fuel temperature value in the fuel tank and a change in fuel pressure according to the fuel temperature. will be.

In general, the hybrid vehicle refers to an electric vehicle that is driven by using either power according to the driving state of the vehicle by efficiently combining two or more different power sources.

In addition, a hybrid vehicle is usually driven by a drive motor using the power of the battery until the vehicle starts to reach a certain speed, and is driven by the engine power at a constant speed, and the engine and the battery power when accelerating at the maximum speed. It adopts the method of driving together.

Accordingly, by minimizing the use of fossil fuels such as gasoline or diesel, it is very helpful to improve fuel efficiency, and thus, it is possible to reduce the air pollution by minimizing the emission of exhaust gas. Recently, active researches have been made in developed countries as well. It is already mass produced and sold.

Even in the case of such a hybrid vehicle, the amount of fuel stored in the fuel tank will vary depending on the degree of volatility of the fuel, but as time passes, the evaporation gas is discharged by evaporation. In addition, pollution may occur due to the release of unburned gases.

Therefore, the hybrid vehicle has an evaporative gas control system for supplying the engine with the evaporated gas generated from the fuel tank, the evaporative gas control system is connected to the fuel tank, the fuel tank for storing the fuel of the vehicle, the fuel tank is connected to the fuel And an evaporation gas collector for collecting the evaporated gas generated in the tank, and a supply line for supplying the evaporated gas of the evaporative gas collector to the engine of the vehicle.

However, when leakage occurs in such an evaporative gas control system, pollution by the evaporated gas cannot be prevented, and thus, an automobile manufacturer has devised a method of detecting leakage of the evaporative gas control system.

For example, in the case of a typical hybrid vehicle, the engine is stopped to improve fuel efficiency and exhaust gas while stopping, and when the engine is stopped, the fuel gas in the canister collecting the evaporative gas of the fuel tank cannot be burned. The fuel tank leak diagnosis could not be carried out during shutdown. As a result, when the fuel was leaked while driving or when the vehicle was parked for a long time, the leak diagnosis of the fuel tank was performed using the cooling effect. Therefore, logic was needed to carry out a leak diagnosis of the fuel tank while driving the hybrid vehicle.

An object of the present invention is to solve the problems as described above, after the canister shut-off valve and the purge valve is closed control when the engine is stopped during driving to derive the vapor pressure in the fuel tank based on the fuel temperature and fuel pressure in the fuel tank and then When the fuel leakage diagnosis is performed, the canister shutoff valve is opened to control the temperature change and the pressure change in the fuel tank, and the fuel leakage in the fuel tank is diagnosed based on the derived pressure change and the derived steam pressure. The purpose of the present invention is to provide a method of diagnosing fuel leakage of a hybrid vehicle that can prevent environmental pollution by preventing the emission of harmful gases due to leakage of the evaporation gas.

Technical problem according to the present invention for achieving this object is,

In the fuel leakage diagnosis method of a hybrid vehicle that is driven by one or more of the motor and gasoline fuel in accordance with each control of the motor control unit and the engine control unit

A vapor pressure deriving step of deriving the vapor pressure in the fuel tank based on the fuel temperature and the pressure in the fuel tank after controlling the canister shutoff valve and the purge valve when the engine is temporarily stopped while driving in the engine control unit;

A change amount derivation step of deriving the temperature change amount and the pressure change amount in the fuel tank after the closing control of the purge valve and the opening control of the canister shutoff valve;

And a fuel leak diagnosis step of diagnosing the fuel leak in the fuel tank based on the derived pressure change amount and the derived vapor pressure.

Preferably, the step of deriving the fuel temperature and pressure change amount,

After the purge valve is closed controlled, the canister shutoff valve is opened controlled to receive the fuel temperature in the fuel tank,

When the received fuel temperature rises, the pressure in the fuel tank is kept at atmospheric pressure,

When the fuel temperature falls and the fuel temperature drops below a preset threshold, the purge valve and the canister shutoff valve are closed to receive the fuel temperature and the pressure in the fuel tank.

When the amount of temperature change in the fuel tank is greater than a predetermined value, it is characterized in that it is provided to derive the pressure change amount in the fuel tank.

Preferably the fuel leak diagnosis step,

A pressure change correction value is derived based on the difference between the pressure change derived from the hybrid controller and the vapor pressure;

When the derived pressure change correction value reaches a predetermined determination reference value, it is characterized in that it is provided to determine to be normal.

Preferably the fuel leak diagnosis step,

When the derived pressure change amount correction value does not reach the determination reference value, it is characterized in that it is provided to determine the fuel leakage diagnosis result as an error.

Preferably the fuel leak diagnosis step,

In the fuel temperature and pressure derivation step, if the amount of temperature change in the fuel tank is not more than a predetermined value, it is characterized in that it is provided to prohibit the diagnosis of fuel leakage.

According to the present invention, when the driving stability condition is satisfied while the vehicle is running, the steam pressure is derived based on the fuel temperature and the pressure in the fuel tank derived through the control of the canister shutoff valve and the purge valve, and after the engine stops, Based on the fuel temperature and pressure change amount and the steam pressure, the fuel leakage diagnosis in the fuel tank is executed, so that even when the engine is stopped while the hybrid vehicle is running, the fuel leakage diagnosis is performed to discharge harmful gas due to the leakage of the evaporation gas of the fuel tank. To prevent the environmental pollution is obtained.

The following drawings, which are attached in this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.
1 is a view showing the configuration of an evaporative gas control system of a hybrid vehicle to which the present invention is applied,
2 is a flowchart illustrating a fuel leakage diagnosis process of a hybrid vehicle according to an exemplary embodiment of the present invention.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention in detail.

FIG. 1 is a diagram illustrating an evaporation gas control system of a hybrid vehicle to which the present invention is applied, and FIG. 2 is a flowchart illustrating a fuel leakage diagnosis process of a fuel tank of an engine control unit illustrated in FIG. 1.

Here, a conventional evaporative gas control system installed in a hybrid vehicle that runs by using at least one power of a motor and gasoline fuel includes a fuel tank 210 for storing fuel of an automobile, the fuel tank ( An evaporation gas collector 215 connected to a pipeline 210 to collect the evaporated gas generated in the fuel tank 210, and supplying the evaporated gas of the evaporative gas collector 215 to the engine 220 of the vehicle. A feed conduit 225.

In addition, to diagnose fuel leakage, the evaporative gas control system includes a canister shutoff valve 260 that selectively opens and closes the connection between the evaporative gas collector 215 and the outside air; A purge valve 270 interposed on the supply conduit 225 to adjust an amount of the evaporated gas supplied from the evaporative gas collector 215 to the engine 220; And controlling the canister shutoff valve 260 and the purge valve 270 based on signals input from the temperature sensor 230 and the pressure sensor 240 inserted into the fuel tank. And an engine control unit 250 (hereinafter referred to as "ECU") for diagnosing.

Although the example of the evaporative gas control system has been described as including an evaporative gas collector 215, even if it does not include the leak detection method of the present invention can be applied, in this case the canister shutoff valve 260 May be interposed at any position from which it is possible to select whether or not to block outside air on the evaporative gas control system.

Here, the ECU 250 is provided to execute fuel leakage diagnosis of the fuel tank 210 through the control of the purge valve 270 and the canister shutoff valve 260 when the engine is stopped while the vehicle is running.

That is, the ECU 250 closes and controls the canister shutoff valve and the purge valve when the engine is temporarily stopped while driving, derives the vapor pressure in the fuel tank based on the fuel temperature and the pressure in the fuel tank, and controls the open of the canister shutoff valve. A temperature change amount and a pressure change amount in the fuel tank are derived, and the fuel leakage in the fuel tank is diagnosed based on the derived pressure change amount and the derived vapor pressure.

The fuel leakage diagnosis process of the hybrid vehicle according to the exemplary embodiment of the present invention described above will be described with reference to FIG. 2.

First, the ECU 250 controls the closing of the canister shutoff valve 260 and the purge valve 270 when the engine is paused while driving through step 101 (103), and then the temperature sensor 230 and the pressure in the fuel tank. Receive the fuel temperature and the fuel pressure supplied from the sensor 240 (step 105).

When the predetermined time elapses after the engine stops, the ECU 250 enters the sleep mode for saving the battery, and then wakes up every predetermined time to execute the fuel leakage diagnosis.

The ECU 250 derives the vapor pressure based on the fuel temperature and the pressure (step 107). The steam pressure is derived based on a saturated steam pressure plot versus fuel temperature and pressure, and the saturated steam pressure plot against fuel temperature and pressure is stored in advance, and a series of deriving steam pressure based on the preset fuel temperature and pressure versus saturated steam plot. Since the process is well known by those skilled in the art, a detailed description thereof will be omitted.

Meanwhile, the ECU 250 controls the canister shutoff valve 260 to open and closes the purge valve 270 to perform fuel leakage diagnosis. The fuel temperature is increased and the fuel pressure is maintained at atmospheric pressure (step 111). .

However, when the received fuel temperature falls and reaches a preset threshold or less, the ECU 250 controls the closing of the purge valve 270 and the canister shutoff valve 260, and then the temperature sensor 230 and the pressure sensor ( The fuel temperature and the fuel pressure supplied from 240 are received for a predetermined period (steps 113 and 115).

At this time, when the received fuel temperature change amount is equal to or more than a predetermined value, the ECU 250 derives the fuel pressure change amount, and derives the pressure change amount correction value based on the derived pressure change amount and the difference between the vapor pressures of the step 107. If the change amount correction value is less than or equal to the predetermined determination reference value, it is determined to be normal (steps 121, 123, 125, and 127).

However, when the pressure change amount correction value is not equal to or less than the predetermined determination reference value in the step 125, the ECU 250 determines that the fuel leakage diagnosis result is an error (step 129).

On the other hand, when the temperature change amount is not more than a predetermined value in step 119, the ECU 250 prohibits fuel leakage diagnosis (step 131).

In other words, when the engine is stopped due to a pause while driving in a hybrid vehicle, steam pressure is derived from the fuel temperature and the fuel pressure and stored thereafter, and then the pressure variation correction value is derived based on the fuel temperature, the fuel pressure, and the steam pressure when the fuel leakage is executed. If the determined pressure change amount correction value is less than or equal to the predetermined threshold value, it is determined to be normal, and if it is not less than or equal to the threshold value, it is determined to be an error for the fuel leakage diagnosis result.

According to an exemplary embodiment of the present invention, after the canister shutoff valve and the purge valve are closed-controlled when the engine stops while driving, the steam pressure in the fuel tank is derived based on the fuel temperature and the fuel pressure in the fuel tank, and then the canister shutoff valve is diagnosed when the fuel leakage is diagnosed. After opening control, the temperature change and the pressure change in the fuel tank are derived, and the fuel leakage in the fuel tank is diagnosed based on the derived pressure change and the derived vapor pressure, and thus harmful gases due to leakage of the evaporative gas from the fuel tank of the hybrid vehicle are diagnosed. It is possible to prevent the pollution of the environment by preventing the emission of.

As such, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing to the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. .

When the engine stops while driving, the canister shutoff valve and the purge valve are closed.The steam pressure in the fuel tank is derived based on the fuel temperature and the fuel pressure in the fuel tank.Then, the temperature in the fuel tank after the canister shutoff valve is opened. By deriving the change amount and the pressure change amount and diagnosing the fuel leakage in the fuel tank based on the derived pressure change amount and the derived vapor pressure, it is possible to prevent harmful emissions due to leakage of the evaporative gas from the fuel tank of the hybrid vehicle. It is possible to bring significant advances in the accuracy and reliability of operation of fuel leakage diagnostic methods for hybrid vehicles that can be prevented, and furthermore in terms of performance efficiency. As it is enough, it is industrial A potentially invention.

210: fuel tank 215: canister
220: engine 225: supply line
230: temperature sensor 240: pressure sensor
260: canister shutoff valve 270: purge valve

Claims (5)

In the fuel leakage diagnosis method of a hybrid vehicle that runs on the power of at least one of a battery and fuel in accordance with each control of the motor control unit and the engine control unit,
A vapor pressure deriving step of deriving the vapor pressure in the fuel tank based on the fuel temperature and the pressure in the fuel tank after controlling the canister shutoff valve and the purge valve when the engine is stopped while driving;
A change amount derivation step of deriving a temperature change amount and a pressure change amount in the fuel tank after the purge valve is closed controlled and the canister shutoff valve is opened controlled;
A fuel leak diagnosis step of diagnosing a fuel leak in the fuel tank based on the derived pressure change and the derived vapor pressure,
The change amount derivation step,
Receive the fuel temperature in the fuel tank after closing the purge valve and controlling the canister shutoff valve
If the fuel temperature rises, the pressure in the fuel tank is kept at atmospheric pressure,
When the fuel temperature falls below a predetermined threshold, the purge valve and the canister shutoff valve are controlled to receive the fuel temperature and the pressure in the fuel tank.
And a temperature change amount in the fuel tank is equal to or greater than a predetermined value, so as to derive a pressure change amount in the fuel tank. delete The method of claim 1, wherein the fuel leakage diagnosis step,
A pressure change correction value is derived based on the difference between the derived pressure change and the vapor pressure.
And when the derived pressure change correction value reaches a predetermined determination reference value, determine to be normal. The method of claim 3, wherein the fuel leakage diagnosis step,
And when the derived pressure change correction value does not reach the determination reference value, determine the error as a fuel leakage diagnosis result. The method of claim 1, wherein the fuel leakage diagnosis step,
And in the step of deriving the change amount, when the change in temperature in the fuel tank is not greater than or equal to a predetermined value, the fuel leakage diagnosis method of the hybrid vehicle, characterized in that the fuel leakage is prohibited.
KR1020130043659A 2013-04-19 2013-04-19 Method for diagnosing leakage of fuel tank of hybrid vehicle KR102052965B1 (en)

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KR101755805B1 (en) 2015-07-09 2017-07-07 현대자동차주식회사 Apparatus and method for detecting leak in hydrogen tank of fuel cell vehicle
KR101905962B1 (en) 2016-07-29 2018-10-08 현대자동차주식회사 The method for removing a leak of fuel tank valve
KR102274116B1 (en) * 2017-03-07 2021-07-06 현대자동차주식회사 Method for diagnosing leak of working fluid for engine clutch in hybrid electric vehicle
JP7124811B2 (en) * 2019-09-04 2022-08-24 トヨタ自動車株式会社 engine device
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