KR20210073830A - method to check leakage of forward section of purge valve in active purge system - Google Patents

method to check leakage of forward section of purge valve in active purge system Download PDF

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KR20210073830A
KR20210073830A KR1020190164519A KR20190164519A KR20210073830A KR 20210073830 A KR20210073830 A KR 20210073830A KR 1020190164519 A KR1020190164519 A KR 1020190164519A KR 20190164519 A KR20190164519 A KR 20190164519A KR 20210073830 A KR20210073830 A KR 20210073830A
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South Korea
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purge
purge valve
pressure sensor
valve
active
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KR1020190164519A
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Korean (ko)
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서정호
노태곤
김승범
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현대자동차주식회사
기아 주식회사
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Priority to KR1020190164519A priority Critical patent/KR20210073830A/en
Publication of KR20210073830A publication Critical patent/KR20210073830A/en

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    • 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
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0032—Controlling the purging of the canister as a function of the engine operating conditions
    • F02D41/004—Control of the valve or purge actuator, e.g. duty cycle, closed loop control of position
    • 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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • 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
    • F02M2025/0845—Electromagnetic valves
    • 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 relates to a method for diagnosing a purge valve front end failure of an active purge system, comprising the following steps of: determining whether a load amount of an engine exceeds an appropriate value; operating a diagnostic device provided in a vent line to diagnose a leak in the active purge system; opening a purge valve and stopping an operation of a purge pump; performing a diagnostic operation using a signal generated by a pressure sensor as a variable; and comparing a result of the diagnostic operation with a diagnostic condition. The present invention provides the method for diagnosing the purge valve front end failure in the active purge system, which is capable of judging water leakage between the purge valve and an intake pipe or disconnection of a connection line according to a signal generated from the pressure sensor provided between the purge pump and the purge valve.

Description

액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법{method to check leakage of forward section of purge valve in active purge system}Method to check leakage of forward section of purge valve in active purge system

본 발명은 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법에 관한 것으로, 더욱 상세하게는, 퍼지밸브와 흡기파이프 사이의 누수를 진단하는 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법에 관한 것이다.The present invention relates to a method for diagnosing a purge valve front end failure of an active purge system, and more particularly, to a method for diagnosing a purge valve front end failure of an active purge system for diagnosing a leak between a purge valve and an intake pipe .

증발가스를 제거하기 위한 퍼지 시스템이 자동차에 장착되고 있다. 퍼지 시스템은 증발가스를 포집하는 캐니스터와, 캐니스터와 흡기파이프를 연결하는 퍼지 컨트롤 밸브를 포함하는 것이 일반적이다. 엔진에 과급기가 장착되지 않을 경우, 퍼지 컨트롤 밸브 작동에 의해 캐니스터와 흡기파이프가 연통되면, 흡기파이프에 작용하는 흡기압에 의해 캐니스터에 포집된 증발가스가 흡기파이프에 유입된다.A purge system for removing boil-off gas is being installed in automobiles. The purge system generally includes a canister for collecting boil-off gas, and a purge control valve connecting the canister and an intake pipe. When the engine is not equipped with a supercharger, when the canister and the intake pipe are communicated by the operation of the purge control valve, the boil-off gas collected in the canister is introduced into the intake pipe by the intake air pressure acting on the intake pipe.

그러나, 과급기가 장착될 경우, 과급기 작동에 의해 흡기파이프의 내부압은 대기압과 같거나 그 보다도 더 높을 수 있다. 이러한 경우, 일반적인 퍼지 시스템으로는 캐니스터에서 흡기파이프로 증발가스가 이동되지 않고, 흡기파이프에서 캐니스터로 흡기가 이동될 여지가 있다.However, when a supercharger is installed, the internal pressure of the intake pipe may be equal to or higher than atmospheric pressure due to the operation of the supercharger. In this case, with the general purge system, the boil-off gas does not move from the canister to the intake pipe, but there is room for the intake air to move from the intake pipe to the canister.

이에 따라, 캐니스터와 퍼지 컨트롤 밸브 사이에 퍼지펌프를 구비한 액티브 퍼지 시스템이 개발되었다. 퍼지펌프 작동에 의해 퍼지펌프와 퍼지 컨트롤 밸브 사이에 증발가스가 압축된 후, 퍼지 컨트롤 밸브의 열림 제어와 개도량 제어를 통해 적정량의 압축된 증발가스가 흡기파이프로 강제 주입된다. Accordingly, an active purge system having a purge pump between the canister and the purge control valve has been developed. After the BOG is compressed between the purge pump and the purge control valve by the operation of the purge pump, an appropriate amount of compressed BOG is forcibly injected into the intake pipe by controlling the opening and opening of the purge control valve.

그러나, 퍼지 컨트롤 밸브와 흡기파이프 사이에 압력차가 크게 발생되므로, 퍼지 컨트롤 밸브와 흡기파이프를 연결하는 라인이 빠지거나, 라인에 누수가 발생될 가능성이 있다.However, since a large pressure difference is generated between the purge control valve and the intake pipe, there is a possibility that the line connecting the purge control valve and the intake pipe may be disconnected or leaks may occur in the line.

특히, 액티브 퍼지 시스템의 경우, 퍼지펌프에 의한 증발가스 압축에 의해 흡기파이프로 증발가스를 강제 주입하게 되므로, 퍼지 컨트롤 밸브와 흡기파이프 사이에 빠짐 또는 누수가 발생될 경우, 실내 또는 대기로 증발가스가 누출될 여지가 높다. 대기로 증발가스가 누출될 경우에는 환경오염을 발생시키게 된다. 실내로 증발가스가 누출될 경우에는, 환경오염뿐만 아니라, 소비자가 연료 냄새를 맡게 되므로, 소비자의 건강에 해로운 영향을 미치며, 자동차의 상품성이 하락하게 된다.In particular, in the case of an active purge system, BOG is forcibly injected into the intake pipe by compression of the BOG by the purge pump. is highly likely to leak. When BOG leaks into the atmosphere, it causes environmental pollution. When BOG leaks into the room, it not only pollutes the environment, but also causes the consumer to smell the fuel, which has a detrimental effect on the health of the consumer and reduces the marketability of the automobile.

대한민국 공개특허공보 제10-1998-0038643호(1998.08.05.)Republic of Korea Patent Publication No. 10-1998-0038643 (Aug. 5, 1998)

위와 같은 점을 감안해 발명된 본 발명의 목적은, 퍼지펌프에 의해 증발가스를 압축해 흡기파이프로 주입하는 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법을 제공하는 것이다.An object of the present invention, which was invented in view of the above points, is to provide a method for diagnosing the front end of a purge valve in an active purge system that compresses boil-off gas by a purge pump and injects it into an intake pipe.

위와 같은 목적을 달성하기 위해서 발명된 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법은, 엔진의 부하량이 적정값을 초과하였는지 판단하는 단계와, 퍼지밸브가 열리고, 퍼지펌프의 작동이 정지되는 단계와, 압력센서에서 생성된 신호를 변수로 진단 연산이 수행되는 단계와, 진단 연산의 결과와 진단 조건을 비교하는 단계를 포함한다.The method for diagnosing the front end of the purge valve of the active purge system according to an embodiment of the present invention, which was invented to achieve the above object, includes the steps of determining whether the load amount of the engine exceeds an appropriate value, the purge valve is opened, and the purge pump It includes the steps of stopping the operation, performing a diagnostic operation using the signal generated from the pressure sensor as a variable, and comparing the result of the diagnostic operation with a diagnostic condition.

또한, 엔진의 부하량이 적정값을 초과하였는지 판단하는 단계에서, 액티브 퍼지 시스템의 리크를 진단하도록 밴트라인에 구비된 진단장치가 동작할 수 있다.In addition, in the step of determining whether the load amount of the engine exceeds an appropriate value, a diagnostic device provided in the vent line may operate to diagnose a leak in the active purge system.

또한, 엔진의 부하량이 적정값을 초과하였는지 판단하는 단계에서, 밴트라인에 구비된 ELCM의 COV(changeover valve)가 작동하거나, 밴트라인에 구비된 CCV(canister close valve)가 닫히도록 작동할 수 있다.In addition, in the step of determining whether the load amount of the engine exceeds the appropriate value, the changeover valve (COV) of the ELCM provided in the vant line operates or the canister close valve (CCV) provided in the vant line may be closed. .

또한, 퍼지밸브가 열리고, 퍼지펌프의 작동이 정지되는 단계에서, 퍼지밸브는, 열림정도가 5% 내지 100%가 되도록 듀티제어될 수 있다.In addition, when the purge valve is opened and the operation of the purge pump is stopped, the purge valve may be duty-controlled so that the degree of opening is 5% to 100%.

또한, 압력센서에서 생성된 신호를 변수로 진단 연산이 수행되는 단계에서, 압력센서를 통해 측정된 압력을 단위 시간별로 기록하고, 압력센서를 통해 측정된 압력을 일정 시간 동안 누적할 수 있다.In addition, in the step of performing a diagnostic operation using the signal generated by the pressure sensor as a variable, the pressure measured through the pressure sensor may be recorded for each unit time, and the pressure measured through the pressure sensor may be accumulated for a predetermined time.

또한, 진단 연산의 결과와 진단 조건을 비교하는 단계에서, 최종적으로 기록된 압력센서를 통해 측정된 압력이 기준값 미만인지 판단하고, 최종적으로 기록된 압력센서를 통해 측정된 압력이 기준값 미만이면, 흡기파이프와 퍼지밸브 사이에 누수가 없는 것으로 판단하고, 최종적으로 기록된 압력센서를 통해 측정된 압력이 기준값 이상이면, 흡기파이프와 퍼지밸브 사이에 누수가 있는 것으로 판단할 수 있다.In addition, in the step of comparing the diagnostic operation result with the diagnostic condition, it is determined whether the pressure measured through the finally recorded pressure sensor is less than the reference value, and if the pressure measured through the finally recorded pressure sensor is less than the reference value, intake If it is determined that there is no leakage between the pipe and the purge valve, and the pressure measured through the finally recorded pressure sensor is greater than or equal to the reference value, it may be determined that there is a leak between the intake pipe and the purge valve.

또한, 진단 연산의 결과와 진단 조건을 비교하는 단계에서, 일정 시간 동안 누적된 압력센서를 통해 측정된 압력의 누적량이 기준값 미만인지 판단하고, 일정 시간 동안 누적된 압력센서를 통해 측정된 압력의 누적량이 기준값 미만이면, 흡기파이프와 퍼지밸브 사이에 누수가 없는 것으로 판단하고, 일정 시간 동안 누적된 압력센서를 통해 측정된 압력의 누적량이 기준값 이상이면, 흡기파이프와 퍼지밸브 사이에 누수가 있는 것으로 판단할 수 있다.In addition, in the step of comparing the diagnostic operation result with the diagnostic condition, it is determined whether the accumulated amount of pressure measured through the pressure sensor accumulated for a predetermined time is less than a reference value, and the accumulated amount of the pressure measured through the pressure sensor accumulated for a predetermined time is determined. If it is less than this reference value, it is determined that there is no leakage between the intake pipe and the purge valve, and if the accumulated amount of pressure measured through the pressure sensor accumulated for a certain period of time is greater than the reference value, it is determined that there is a leak between the intake pipe and the purge valve can do.

위와 같이 구성되는 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법에 따르면, 퍼지펌프와 퍼지밸브 사이에 구비된 압력센서에서 발생된 신호에 따라 퍼지밸브와 흡기파이프 사이의 누수 또는 연결 라인 빠짐을 판단할 수 있다.According to the method for diagnosing the front end of the purge valve of the active purge system of the present invention configured as described above, leakage between the purge valve and the intake pipe according to a signal generated from the pressure sensor provided between the purge pump and the purge valve Alternatively, it may be determined that the connection line is missing.

또한, 퍼지밸브 전단의 누수를 판단하므로, 퍼지밸브 전단 빠짐에 의한 증발가스의 대기 중 누출 또는 증발가스의 실내로의 누출이 차단된다. 대기로의 증발가스 누출이 방지되므로, 대기오염이 예방된다. 실내로의 증발가스 누출이 방지되므로, 대기오염이 방지됨과 동시에, 탑승자가 증발가스를 직접적으로 호흡하게 되는 것이 방지되며, 자동차의 상품성이 유지되거나, 증대될 수 있다. In addition, since leakage of the front end of the purge valve is determined, leakage of boil-off gas into the atmosphere or leakage of boil-off gas into the room due to the removal of the front end of the purge valve is blocked. Since leakage of boil-off gas into the atmosphere is prevented, air pollution is prevented. Since leakage of BOG into the room is prevented, air pollution is prevented and, at the same time, the occupant is prevented from directly breathing BOG, and the commercial property of the vehicle can be maintained or increased.

도 1은 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법이 적용되는 액티브 퍼지 시스템의 예시도이다.
도 2는 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법을 보여주는 절차도이다.
도 3은 누수 진단 결과를 보여주는 그래프이다.1 is an exemplary diagram of an active purge system to which a method for diagnosing a purge valve front end of an active purge system according to an embodiment of the present invention is applied.
2 is a flowchart illustrating a method for diagnosing a purge valve front end failure of an active purge system according to an embodiment of the present invention.
3 is a graph showing a leak diagnosis result.

이하, 첨부된 도면을 참조로 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법을 설명한다.Hereinafter, a method for diagnosing a purge valve front end of an active purge system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

액티브 퍼지 시스템이 적용되는 차량에는, 흡기파이프(I)와 연결된 엔진(600)과, 엔진(600)과 동시에 구동력을 발생하거나 또는 홀로 구동력을 발생하는 모터(700)와, 모터(700)에 전력을 공급하는 배터리(800)가 구비된다.In a vehicle to which the active purge system is applied, an engine 600 connected to the intake pipe I, a motor 700 that generates a driving force simultaneously with the engine 600 or a driving force alone, and electric power to the motor 700 . A battery 800 for supplying

도 1에 도시된 바와 같이, 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법이 적용되는, 액티브 퍼지 시스템은, 연료탱크(F)에서 발생된 증발가스를 가압하고 가압된 증발가스를 흡기파이프(I)에 공급하는 액티브 퍼지 유닛(APU) 및, 액티브 퍼지 유닛(APU)을 제어하는 컨트롤 유닛(900)을 포함한다. As shown in FIG. 1 , the active purge system, to which the method of diagnosing the front end of the purge valve of the active purge system of the present invention is applied, pressurizes the boil-off gas generated in the fuel tank F and pressurized and an active purge unit APU for supplying boil-off gas to the intake pipe I, and a control unit 900 for controlling the active purge unit APU.

액티브 퍼지 유닛(APU)은, 연료탱크(F)에서 발생한 증발가스를 흡착하는 캐니스터(C)와 흡기파이프(I)를 연결하는 퍼지라인(100)과, 퍼지라인(100)에 장착된 퍼지펌프(200)와, 퍼지펌프(200)와 흡기파이프(I) 사이에 위치되도록 퍼지라인(100)에 장착된 퍼지밸브(300)와, 퍼지펌프(200)와 퍼지밸브(300) 사이에 위치되도록 퍼지라인(100)에 장착된 제1 압력센서(400)와, 캐니스터(C)와 퍼지펌프(200) 사이에 위치되도록 퍼지라인(100)에 장착된 제2 압력센서(500)를 포함한다. The active purge unit (APU) includes a purge line 100 connecting the canister C for adsorbing boil-off gas generated in the fuel tank F and the intake pipe I, and a purge pump mounted on the purge line 100 . 200 and the purge valve 300 mounted on the purge line 100 to be positioned between the purge pump 200 and the intake pipe I, and the purge pump 200 to be positioned between the purge valve 300 It includes a first pressure sensor 400 mounted on the purge line 100 and a second pressure sensor 500 mounted on the purge line 100 to be positioned between the canister C and the purge pump 200 .

컨트롤유닛(900)은 배터리(800), 제1 압력센서(400) 및 제2 압력센서(500)로부터 신호를 수신하고, 퍼지펌프(200)와 퍼지밸브(300)에 작동신호를 송신한다.The control unit 900 receives signals from the battery 800 , the first pressure sensor 400 , and the second pressure sensor 500 , and transmits operation signals to the purge pump 200 and the purge valve 300 .

한편, 캐니스터(C)는, 대기와 밴트라인(L)을 통해 연결된다. 라인에는 밴트밸브(V; CCV; canister close valve)가 제공된다. 밴트밸브(V)는 공기만을 선별적으로 캐니스터(C) 외부로 배출하거나 외부에서 캐니스터(C)로 유입시킨다. On the other hand, the canister (C) is connected to the atmosphere and the vent line (L). The line is provided with a vent valve (V; CCV; canister close valve). The vent valve (V) selectively discharges only air to the outside of the canister (C) or introduces it into the canister (C) from the outside.

밴트라인(L)에는 ELCM(evaporative leak check module)이 구비될 수 있다. ELCM 내부에는 레퍼런스 오리피스가 장착되고, 공기 유동 방향을 기준으로 레퍼런스 오리피스 후단에 압력센서가 장착된다. 레퍼런스 오리피스에 의해 압력센서로 유동하는 공기의 유량은 일정해 진다. 이에 따라, 압력센서에서 발생하는 신호의 크기는 각종 환경 변수에 따라 임의적인 값에 도달하게 된다. ELCM에는 전환밸브(COV)가 구비된다. 전환밸브가 작동되면, 캐니스터와 연료탱크를 포함하는 연료 시스템에 공기 유동이 발생된다. 이때, 연료 시스템으로부터 대기로 배출되는 유량은 점차적으로 감소하게 된다. ELCM은 전환밸브 작동 전후에 측정된 압력을 비교해, 증발가스 퍼지 시스템의 누수를 진단한다.An evaporative leak check module (ELCM) may be provided in the vent line L. A reference orifice is mounted inside the ELCM, and a pressure sensor is mounted at the rear end of the reference orifice based on the air flow direction. The flow rate of air flowing to the pressure sensor is constant by the reference orifice. Accordingly, the magnitude of the signal generated by the pressure sensor reaches an arbitrary value according to various environmental variables. The ELCM is equipped with a switching valve (COV). When the selector valve is actuated, an air flow is created in the fuel system including the canister and fuel tank. At this time, the flow rate discharged from the fuel system to the atmosphere is gradually reduced. ELCM diagnoses leaks in the boil-off gas purge system by comparing the pressures measured before and after operation of the switching valve.

컨트롤유닛(900)은, 연소가스의 산소량을 감지하는 람다센서(S1)로부터 신호를 수신한다. 컨트롤유닛(900)은, 람다센서(S1)에서 감지된 산소량을 근거로 연소실에서 연소된 혼합가스의 공연비를 도출한다. 컨트롤유닛(900)은, 연소실로 연료를 공급하는 연료 공급 시스템과 신호를 송수신한다. The control unit 900 receives a signal from the lambda sensor S1 that detects the amount of oxygen in the combustion gas. The control unit 900 derives an air-fuel ratio of the mixed gas burned in the combustion chamber based on the amount of oxygen detected by the lambda sensor S1 . The control unit 900 transmits/receives signals to and from a fuel supply system that supplies fuel to the combustion chamber.

흡기파이프(I)는, 에어클리너(A)와 터보차져(T) 사이에 위치된다. 터보차져(T)와 인테이크 매니폴더(IM) 사이에 인터쿨러(IC)가 제공된다.The intake pipe (I) is located between the air cleaner (A) and the turbocharger (T). An intercooler IC is provided between the turbocharger T and the intake manifold IM.

퍼지라인(100)에는, 퍼지펌프(200), 퍼지밸브(300), 제1 압력센서(400), 제2 압력센서(500), 유량계센서(미도시)가 제공된다. 제1 압력센서(400)와 제2 압력센서(500)는 퍼지펌프(200) 전단과 후단의 압력을 감지해 컨트롤유닛(900)으로 지속적으로 송신한다. 유량계센서는 퍼지밸브(300)와 흡기파이프(I) 사이에 위치된다. 유량계센서는 퍼지라인(100)으로부터 흡기파이프(I)로 유동하는 증발가스의 양을 지속적으로 감지하고 컨트롤유닛(900)으로 송신한다.The purge line 100 is provided with a purge pump 200 , a purge valve 300 , a first pressure sensor 400 , a second pressure sensor 500 , and a flow meter sensor (not shown). The first pressure sensor 400 and the second pressure sensor 500 sense the pressures of the front and rear ends of the purge pump 200 and continuously transmit them to the control unit 900 . The flow meter sensor is located between the purge valve 300 and the intake pipe (I). The flow meter sensor continuously detects the amount of BOG flowing from the purge line 100 to the intake pipe I and transmits it to the control unit 900 .

컨트롤유닛(900)은, 연료 공급 시스템, 람다센서(S1), 제1 압력센서(400), 제2 압력센서(500), 유량계센서로부터 수신한 신호를 종합해 퍼지라인(100)에서 흡기파이프(I)로 유동하는 증발가스가 목표퍼지유량이 되도록 퍼지펌프(200)의 회전수와, 퍼지밸브(300)의 개도량을 조절한다. 연료 공급 시스템은, 컨트롤유닛(900)에 차량 속도, 현재 연료 분사량 등을 송신한다.The control unit 900 integrates the signals received from the fuel supply system, the lambda sensor S1, the first pressure sensor 400, the second pressure sensor 500, and the flow meter sensor, and then collects the signals from the purge line 100 in the intake pipe. The number of rotations of the purge pump 200 and the opening degree of the purge valve 300 are adjusted so that the boil-off gas flowing to (I) becomes a target purge flow rate. The fuel supply system transmits the vehicle speed, the current fuel injection amount, and the like to the control unit 900 .

목표퍼지유량은, 엔진 조건(rpm, 냉각수 온도 등), 차량속도, 연료 공급 시스템의 작동 상태를 감안해, 최종적으로 연소실에 공급된 연료와 흡기의 혼합비가 이론 공연비가 될 수 있도록 미리 유도된 값이다. The target purge flow rate is a value derived in advance so that the mixing ratio of the fuel finally supplied to the combustion chamber and the intake air becomes the stoichiometric air-fuel ratio in consideration of engine conditions (rpm, coolant temperature, etc.), vehicle speed, and the operating state of the fuel supply system. .

일 예에 따르면, 컨트롤유닛(900)은, 증발가스의 유량이 목표퍼지유량이 되도록, 미리 정해진 1개 이상의 가동회전수로 퍼지펌프(200)를 가동시키고, 퍼지펌프(200)의 가동회전수에 따라 퍼지밸브(300)를 미리 정해진 1개 이상의 개도량이 되도록 작동시킨다. 퍼지펌프(200) 가동회전수는, 15000, 30000, 45000, 60000이고, 퍼지밸브(300)의 개도량은, 100%, 70%, 50%, 30%이다.According to an example, the control unit 900 operates the purge pump 200 at one or more predetermined operating rotation speeds so that the flow rate of boil-off gas becomes the target purge flow rate, and the operation rotation speed of the purge pump 200 . Accordingly, the purge valve 300 is operated so as to be one or more predetermined opening degrees. The operating rotation speed of the purge pump 200 is 15000, 30000, 45000, and 60000, and the opening degree of the purge valve 300 is 100%, 70%, 50%, and 30%.

컨트롤유닛(900)이, 여러 센서들에 의해 감지된 정보를 근거로 퍼지펌프(200)와 퍼지밸브(300)의 작동을 제어해 퍼지라인(100)에서 흡기파이프(I)로 유동하는 증발가스의 양을 조절하므로, 캐니스터(C)에서 흡기파이프(I)로 공급되는 증발가스의 농도 또는 밀도가 조절될 수 있다.The control unit 900 controls the operation of the purge pump 200 and the purge valve 300 based on the information detected by various sensors, so that boil-off gas flowing from the purge line 100 to the intake pipe I By controlling the amount of , the concentration or density of the boil-off gas supplied from the canister (C) to the intake pipe (I) can be adjusted.

위와 같이 구성되는 액티브 퍼지 시스템에 도 2에 도시된 바와 같은, 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브(300) 전단 빠짐을 진단하는 방법이 적용되어 퍼지밸브(300)와 흡기파이프(I) 사이의 누수가 진단된다.As shown in FIG. 2, the method for diagnosing the front end of the purge valve 300 of the active purge system of the present invention is applied to the active purge system configured as above, so that the purge valve 300 and the intake pipe I ) is diagnosed.

도 2에 도시된 바와 같이, 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브(300) 전단 빠짐을 진단하는 방법은, 엔진(600)의 부하량이 적정값을 초과하였는지 판단하는 단계(S100)와, 퍼지밸브(300)가 열리고, 퍼지펌프(200)의 작동이 정지되는 단계(S200)와, 제1 압력센서(400)에서 생성된 신호를 변수로 진단 연산이 수행되는 단계(S300)와, 진단 연산의 결과와 진단 조건을 비교하는 단계(S400)를 포함한다.As shown in FIG. 2 , the method for diagnosing the front end of the purge valve 300 of the active purge system of the present invention includes the steps of determining whether the load amount of the engine 600 exceeds an appropriate value (S100) and , the purge valve 300 is opened and the operation of the purge pump 200 is stopped (S200), and a diagnostic operation is performed using the signal generated from the first pressure sensor 400 as a variable (S300); and comparing the result of the diagnosis operation with the diagnosis condition ( S400 ).

엔진(600)의 부하량이 적정값을 초과하였는지 판단하는 단계(S100)에서, 컨트롤유닛(900)은, 차량에 구비된 각종 센서에서 수신한 신호를 변수로써 준비된 수식, 그래프, 테이블에 대입해 엔진(600)의 부하량을 산출할 수 있다. 컨트롤유닛(900)에는, 적정값이 미리 설정된다. 적정값은, 미리 실험을 통해 도출된 값으로, 엔진(600)이 고부하 상태로써 과급기가 작동해 흡기파이프(I)에 흡기 부압이 충분히 발생하는 경우와, 엔진(600)이 저부하 상태로써 과급기의 작동이 미미해, 흡기파이프(I)에 흡기 부압이 충분히 발생하지 못한 경우로 구분해 각각 다른 값으로 설정된다. In the step (S100) of determining whether the load amount of the engine 600 exceeds the appropriate value, the control unit 900 substitutes the signals received from various sensors provided in the vehicle into the formulas, graphs, and tables prepared as variables for the engine (600) can be calculated. In the control unit 900, an appropriate value is preset. The appropriate value is a value derived through an experiment in advance, when the engine 600 operates under a high load state and the intake negative pressure is sufficiently generated in the intake pipe I, and when the engine 600 is under a low load state, the turbocharger It is set to a different value by classifying it as a case in which the intake negative pressure in the intake pipe (I) is not sufficiently generated due to the insignificant operation of the .

엔진(600)의 부하량이 적정값을 초과하였는지 판단하는 단계(S100)에서는, 액티브 퍼지 시스템의 리크를 진단하도록 밴트라인(L)에 구비된 진단장치가 동작한다. 진단장치 작동에 의해, 밴트라인(L)을 통해 유동하는 공기량은 0이거나 미약하도록 제어된다.In step S100 of determining whether the load amount of the engine 600 exceeds an appropriate value, a diagnostic device provided in the vent line L operates to diagnose a leak in the active purge system. By operating the diagnostic device, the amount of air flowing through the vent line L is controlled to be zero or weak.

밴트라인(L)에 ELCM이 장착된 경우, COV(changeover valve)가 작동함으로써, 밴트라인(L)을 통한 공기유입이 미약하게 된다. 밴트라인(L)에 CCV(canister close valve; V)가 장착된 경우, CCV(V)가 닫히도록 작동함으로써, 밴트라인(L)을 통한 공기유입을 차단한다.When the ELCM is mounted on the vent line (L), a changeover valve (COV) operates, so that the air inflow through the vent line (L) is weak. When a canister close valve (V) is mounted on the vent line (L), the CCV (V) operates to close, thereby blocking the inflow of air through the vent line (L).

퍼지밸브(300)가 열리고, 퍼지펌프(200)의 작동이 정지되는 단계(S200)에서, 퍼지밸브(300)는, 열림정도가 5% 내지 100%가 되도록 듀티제어된다. 퍼지펌프(200)의 회전수는 0이된다.In the step S200 in which the purge valve 300 is opened and the operation of the purge pump 200 is stopped, the purge valve 300 is duty-controlled so that the degree of opening is 5% to 100%. The rotation speed of the purge pump 200 becomes zero.

제1 압력센서(400)에서 생성된 신호를 변수로 진단 연산이 수행되는 단계(S300)는, 엔진(600)의 부하량에 따라 달리 수행된다. 엔진(600)이 고부하 상태인 경우, 단계(S300)에서는, 제1 압력센서(400)를 통해 측정된 압력을 단위 시간별로 기록한다.The step ( S300 ) of performing a diagnostic operation using the signal generated by the first pressure sensor 400 as a variable is performed differently depending on the load amount of the engine 600 . When the engine 600 is in a high load state, in step S300 , the pressure measured by the first pressure sensor 400 is recorded for each unit time.

그리고, 진단 연산의 결과와 진단 조건을 비교하는 단계(S400)에서는, 최종적으로 기록된 제1 압력센서(400)를 통해 측정된 압력이 기준값 미만인지를 판단한다. 최종적으로 기록된 제1 압력센서(400)를 통해 측정된 압력이 기준값 미만이면, 흡기파이프(I)와 퍼지밸브(300) 사이에 누수가 없는 것으로 판단한다. 최종적으로 기록된 제1 압력센서(400)를 통해 측정된 압력이 기준값 이상이면, 흡기파이프(I)와 퍼지밸브(300) 사이에 누수가 있는 것으로 판단한다.Then, in the step (S400) of comparing the result of the diagnosis operation with the diagnosis condition, it is determined whether the pressure measured through the finally recorded first pressure sensor 400 is less than a reference value. When the finally recorded pressure measured through the first pressure sensor 400 is less than the reference value, it is determined that there is no leakage between the intake pipe I and the purge valve 300 . When the finally recorded pressure measured through the first pressure sensor 400 is equal to or greater than the reference value, it is determined that there is a leak between the intake pipe I and the purge valve 300 .

도 3에는 누수 진단 결과를 보여주는 그래프가 도시되었다. 도 3에 도시된 바와 같이, 엔진(600)이 고부하인 상태로, 과급기 작동에 따라 흡기파이프(I)에 발생되는 부압은 대기압에 비해 크다. 이러한 경우에, 퍼지밸브(300)와 흡기파이프(I) 사이에 누수가 없다면, 제1 압력센서(400)는 대기압에 비해 낮은 압력을 계측하게 된다. 퍼지밸브(300)와 흡기파이프(I) 사이에 누수가 존재한다면, 퍼지라인(100)은 대기와 연통되므로, 제1 압력센서(400)는 대기압과 동일한 압력을 계측하게 된다.3 is a graph showing the leak diagnosis result is shown. As shown in FIG. 3 , in a state where the engine 600 is under a high load, the negative pressure generated in the intake pipe I according to the operation of the supercharger is greater than the atmospheric pressure. In this case, if there is no leakage between the purge valve 300 and the intake pipe I, the first pressure sensor 400 measures a pressure lower than the atmospheric pressure. If there is a leak between the purge valve 300 and the intake pipe I, the purge line 100 communicates with the atmosphere, so that the first pressure sensor 400 measures the same pressure as the atmospheric pressure.

엔진(600)이 저부하 상태인 경우, 단계(S300)에서는, 제1 압력센서(400)를 통해 측정된 압력을 일정 시간 동안 누적한다.When the engine 600 is in a low load state, in step S300 , the pressure measured through the first pressure sensor 400 is accumulated for a predetermined time.

그리고, 진단 연산의 결과와 진단 조건을 비교하는 단계(S400)에서는, 일정 시간 동안 누적된 제1 압력센서(400)를 통해 측정된 압력의 누적량이 기준값 미만인지 판단한다. 일정 시간 동안 누적된 제1 압력센서(400)를 통해 측정된 압력의 누적량이 기준값 미만이면, 흡기파이프(I)와 퍼지밸브(300) 사이에 누수가 없는 것으로 판단한다. 일정 시간 동안 누적된 제1 압력센서(400)를 통해 측정된 압력의 누적량이 기준값 이상이면, 흡기파이프(I)와 퍼지밸브(300) 사이에 누수가 있는 것으로 판단한다. 누적량은, 컨트롤유닛(900)에 그래프, 테이블의 형태로 저장된다. Then, in step S400 of comparing the result of the diagnosis operation with the diagnosis condition, it is determined whether the accumulated amount of pressure measured through the first pressure sensor 400 accumulated for a predetermined time is less than a reference value. When the accumulated amount of pressure measured through the first pressure sensor 400 accumulated for a predetermined time is less than the reference value, it is determined that there is no leakage between the intake pipe I and the purge valve 300 . If the accumulated amount of pressure measured through the first pressure sensor 400 accumulated for a predetermined time is equal to or greater than the reference value, it is determined that there is a leak between the intake pipe I and the purge valve 300 . The accumulated amount is stored in the control unit 900 in the form of graphs and tables.

위와 같이 구성되는 본 발명의 일실시예의 액티브 퍼지 시스템의 퍼지밸브(300) 전단 빠짐을 진단하는 방법에 따르면, 퍼지펌프(200)와 퍼지밸브(300) 사이에 구비된 제1 압력센서(400)에서 발생된 신호에 따라 퍼지밸브(300)와 흡기파이프(I) 사이의 누수 또는 연결 라인 빠짐을 판단할 수 있다.According to the method for diagnosing the front end of the purge valve 300 of the active purge system of the present invention configured as above, the first pressure sensor 400 provided between the purge pump 200 and the purge valve 300 . Depending on the signal generated in , it may be determined whether water leakage between the purge valve 300 and the intake pipe I or the connection line is missing.

또한, 퍼지밸브(300) 전단의 누수를 판단하므로, 퍼지밸브(300) 전단 빠짐에 의한 증발가스의 대기 중 누출 또는 증발가스의 실내로의 누출을 차단할 수 있다. 대기로의 증발가스 누출이 방지되므로, 대기오염이 예방된다. 실내로의 증발가스 누출이 방지되므로, 대기오염이 방지됨과 동시에, 탑승자가 증발가스를 직접적으로 호흡하게 되는 것이 방지되며, 자동차의 상품성이 유지되거나, 증대될 수 있다.In addition, since the leak at the front end of the purge valve 300 is determined, it is possible to block the leakage of the boil-off gas into the atmosphere or the boil-off gas into the room due to the front end of the purge valve 300 being omitted. Since leakage of boil-off gas into the atmosphere is prevented, air pollution is prevented. Since leakage of BOG into the room is prevented, air pollution is prevented and, at the same time, the occupant is prevented from directly breathing BOG, and the commercial property of the vehicle can be maintained or increased.

100: 퍼지라인 200: 퍼지펌프
300: 퍼지밸브 400: 제1 압력센서
500: 제2 압력센서 600: 엔진
700: 모터 800: 배터리
900: 컨트롤유닛 APU: 액티브 퍼지 유닛
F: 연료탱크 C: 캐니스터
I: 흡기파이프 L: 밴트라인100: purge line 200: purge pump
300: purge valve 400: first pressure sensor
500: second pressure sensor 600: engine
700: motor 800: battery
900: control unit APU: active purge unit
F: fuel tank C: canister
I: Intake pipe L: Vent line

Claims (7)

차량에 구비된 연료탱크와, 상기 연료탱크에서 발생된 증발가스가 흡착되는 캐니스터와, 상기 캐니스터와 흡기파이프를 연결하는 퍼지라인과, 상기 퍼지라인에 구비된 퍼지밸브와, 상기 캐니스터와 상기 퍼지밸브 사이에 위치하도록 상기 퍼지라인에 구비된 퍼지펌프와, 상기 퍼지밸브와 상기 퍼지펌프 사이에 위치하도록 상기 퍼지라인에 구비된 압력센서와, 상기 캐니스터로부터 대기중으로 연장된 밴트라인을 포함하는 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법에 있어서,
엔진의 부하량이 적정값을 초과하였는지 판단하는 단계;
상기 퍼지밸브가 열리고, 상기 퍼지펌프의 작동이 정지되는 단계;
상기 압력센서에서 생성된 신호를 변수로 하여 진단 연산이 수행되는 단계;
상기 진단 연산의 결과와 진단 조건을 비교하는 단계를 포함하는 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법.
A fuel tank provided in a vehicle, a canister into which boil-off gas generated from the fuel tank is adsorbed, a purge line connecting the canister and an intake pipe, a purge valve provided in the purge line, the canister and the purge valve An active purge system including a purge pump provided in the purge line to be positioned therebetween, a pressure sensor provided to the purge line to be positioned between the purge valve and the purge pump, and a vent line extending from the canister to the atmosphere In the method of diagnosing a purge valve shear failure of
determining whether the load amount of the engine exceeds an appropriate value;
opening the purge valve and stopping the operation of the purge pump;
performing a diagnostic operation using the signal generated by the pressure sensor as a variable;
and comparing a result of the diagnostic operation with a diagnostic condition.
 제1항에 있어서,
상기 엔진의 부하량이 적정값을 초과하였는지 판단하는 단계에서,
상기 액티브 퍼지 시스템의 리크를 진단하도록 상기 밴트라인에 구비된 진단장치가 동작하는 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법.
According to claim 1,
In the step of determining whether the load amount of the engine exceeds an appropriate value,
A method for diagnosing a front end failure of a purge valve of an active purge system in which a diagnostic device provided in the vent line operates to diagnose a leak in the active purge system.
 제1항에 있어서,
상기 엔진의 부하량이 적정값을 초과하였는지 판단하는 단계에서,
상기 밴트라인에 구비된 ELCM의 COV(changeover valve)가 작동하거나, 상기 밴트라인에 구비된 CCV(canister close valve)가 닫히도록 작동하는, 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법.
According to claim 1,
In the step of determining whether the load amount of the engine exceeds an appropriate value,
A method of diagnosing a front end failure of a purge valve of an active purge system, wherein a changeover valve (COV) of the ELCM provided in the vent line operates or a canister close valve (CCV) provided in the vent line operates to close.
 제1항에 있어서,
상기 퍼지밸브가 열리고, 상기 퍼지펌프의 작동이 정지되는 단계에서,
상기 퍼지밸브는, 열림정도가 5% 내지 100%가 되도록 듀티제어되는, 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법.
According to claim 1,
When the purge valve is opened and the operation of the purge pump is stopped,
The method of diagnosing a purge valve front end of an active purge system, wherein the purge valve is duty-controlled so that the degree of opening is 5% to 100%.
 제1항에 있어서,
상기 압력센서에서 생성된 신호를 변수로 진단 연산이 수행되는 단계에서,
상기 압력센서를 통해 측정된 압력을 단위 시간별로 기록하고,
상기 압력센서를 통해 측정된 압력을 일정 시간 동안 누적하는, 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법.
According to claim 1,
In the step of performing a diagnostic operation using the signal generated by the pressure sensor as a variable,
Record the pressure measured by the pressure sensor for each unit time,
A method of accumulating the pressure measured through the pressure sensor for a predetermined period of time, a method of diagnosing a purge valve front end of an active purge system.
 제5항에 있어서,
상기 진단 연산의 결과와 진단 조건을 비교하는 단계에서,
최종적으로 기록된 상기 압력센서를 통해 측정된 압력이 기준값 미만인지 판단하고,
최종적으로 기록된 상기 압력센서를 통해 측정된 압력이 기준값 미만이면, 상기 흡기파이프와 상기 퍼지밸브 사이에 누수가 없는 것으로 판단하고,
최종적으로 기록된 상기 압력센서를 통해 측정된 압력이 기준값 이상이면, 상기 흡기파이프와 상기 퍼지밸브 사이에 누수가 있는 것으로 판단하는 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법.
6. The method of claim 5,
In the step of comparing the result of the diagnosis operation and the diagnosis condition,
Finally, it is determined whether the pressure measured through the recorded pressure sensor is less than the reference value,
If the pressure measured through the finally recorded pressure sensor is less than the reference value, it is determined that there is no leakage between the intake pipe and the purge valve,
A method for diagnosing a front end of a purge valve of an active purge system in which it is determined that there is a leak between the intake pipe and the purge valve when the pressure measured through the finally recorded pressure sensor is greater than or equal to a reference value.
 제5항에 있어서,
상기 진단 연산의 결과와 진단 조건을 비교하는 단계에서,
일정 시간 동안 누적된 상기 압력센서를 통해 측정된 압력의 누적량이 기준값 미만인지 판단하고,
일정 시간 동안 누적된 상기 압력센서를 통해 측정된 압력의 누적량이 기준값 미만이면, 상기 흡기파이프와 상기 퍼지밸브 사이에 누수가 없는 것으로 판단하고,
일정 시간 동안 누적된 상기 압력센서를 통해 측정된 압력의 누적량이 기준값 이상이면, 상기 흡기파이프와 상기 퍼지밸브 사이에 누수가 있는 것으로 판단하는 액티브 퍼지 시스템의 퍼지밸브 전단 빠짐을 진단하는 방법.6. The method of claim 5,
In the step of comparing the result of the diagnosis operation and the diagnosis condition,
It is determined whether the accumulated amount of pressure measured through the pressure sensor accumulated for a certain time is less than a reference value,
If the accumulated amount of pressure measured through the pressure sensor accumulated for a certain time is less than the reference value, it is determined that there is no leakage between the intake pipe and the purge valve,
A method of diagnosing a front end of a purge valve of an active purge system in which it is determined that there is a leak between the intake pipe and the purge valve when the accumulated amount of pressure measured through the pressure sensor accumulated for a predetermined time is equal to or greater than a reference value.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980038643A (en) 1996-11-26 1998-08-05 박병재 Canisters for the treatment of fuel boil-off gases

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980038643A (en) 1996-11-26 1998-08-05 박병재 Canisters for the treatment of fuel boil-off gases

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