KR20010066022A - Carbide deposit removing apparatus in EGR valve seat - Google Patents

Carbide deposit removing apparatus in EGR valve seat Download PDF

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Publication number
KR20010066022A
KR20010066022A KR1019990067604A KR19990067604A KR20010066022A KR 20010066022 A KR20010066022 A KR 20010066022A KR 1019990067604 A KR1019990067604 A KR 1019990067604A KR 19990067604 A KR19990067604 A KR 19990067604A KR 20010066022 A KR20010066022 A KR 20010066022A
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South Korea
Prior art keywords
exhaust gas
wire heater
egr
heater
egr valve
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KR1019990067604A
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Korean (ko)
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KR100343995B1 (en
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김성근
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이계안
현대자동차주식회사
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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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • 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
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR 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
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

PURPOSE: A foreign substance remover of an EGR(Exhaust Gas Recirculation) system is provided to prevent the deposition of carbon in an EGR system and the degradation of an EGR valve by burning foreign substances in exhaust gas. CONSTITUTION: A foreign substance remover of an EGR system comprises a wire heater(11) installed in an inlet of an EGR valve(2), front and rear manometers(12,13) measuring front and rear pressures of the heater, a differential pressure sensor(14) calculating difference of the front and rear pressures, and an ECU(Electronic Control Unit)(15) controlling to supply power to the heater upon pressure difference over a predetermined value. If resistance occurs in an exhaust gas flow due to the collection of HC and oil tar in the exhaust gas, pressure difference occurs in the front and rear portions of the heater. Then the ECU applies power to the wire heater. The wire heater is heated and foreign substances filtered by a wire screen of the wire heater are burned with the heat.

Description

배기가스 재순환 공급장치의 이물질 제거장치{Carbide deposit removing apparatus in EGR valve seat}Carbide deposit removing apparatus in EGR valve seat}

본 발명은 배기가스 재순환 공급장치(EGR장치)의 이물질 제거장치에 관한 것이다.The present invention relates to a debris removal device of an exhaust gas recirculation supply device (EGR device).

엔진에서 연소되어 배출되는 배기가스의 유해성분은 HC,NOx,CO로서 대기 오염을 방지하기 위해서 이들 유해 가스의 정화 문제가 중요하다.The harmful constituents of the exhaust gas emitted by combustion in the engine are HC, NOx, CO. In order to prevent air pollution, the problem of purification of these harmful gases is important.

이때문에 배기가스 배출량을 감소시키기 위하여 배기되는 배기가스의 일부를 흡기매니폴드로 재순환시켜 혼합기와 함께 혼합하여 연소시켜 배출하는 EGR 시스템이 사용되고 있다.For this reason, in order to reduce the amount of exhaust gas, an EGR system that recycles a part of the exhaust gas to the intake manifold, mixes it with the mixer, and burns it.

배기가스를 재순환시키게 되면 혼합기가 희박해지게 되나 최근에 기술의 진보에 따라 혼합기의 와류 형성에 의한 완전연소가 가능하므로 배기가스 배출량이 감소되어지게 되며, 특히 배기가스 유입에 의해 연소실의 온도가 낮아지게 되므로 높은 온도에서 배출량이 증대되는 NOx 성분의 배출량 저감에 효과가 있다.Recycling the exhaust gas makes the mixer thinner, but according to recent technological advances, it is possible to burn completely by vortex formation of the mixer, which reduces the emission of exhaust gas. In particular, the temperature of the combustion chamber is low due to the inflow of exhaust gas. As a result, it is effective in reducing the emissions of NOx components, which are increased at high temperatures.

그러나 종래의 EGR 시스템에 의하면 배기가스속의 탄화물이 EGR 밸브 시트부등에 퇴적하여 배기가스의 흐름을 방해하고 밸브의 닫힘을 방해할 뿐 아니라 그 공급량을 불안정하게 만들게 되는 문제점이 있다.However, according to the conventional EGR system, carbides in the exhaust gas accumulate in the EGR valve seat and the like, which not only disturbs the flow of the exhaust gas and prevents the valve from closing, but also makes the supply amount unstable.

이때문에 EGR 밸브의 장착 위치를 배기매니폴드부에 직접 부착하므로써 고온의 배기열에 의해 퇴적된 탄화물을 연소시켜 제거하고 있으나 EGR 밸브는 흡기 부압에 의해 작동하는 다이어프램을 포함하고 있어, 배기매니폴드로부터 전달되는 고열에 의해 다이어프램이 쉽게 손상되어 유지 보수비가 많이 드는 문제점이 있으며, 또 EGR 파이프의 길이가 길어져 EGR 응답성이 떨어지는 문제점이 있었다.Therefore, by attaching the mounting position of the EGR valve directly to the exhaust manifold, the carbide deposited by the high temperature exhaust heat is burned and removed, but the EGR valve includes a diaphragm operated by intake negative pressure, There is a problem in that the diaphragm is easily damaged by the high temperature transmitted, which leads to a high maintenance cost, and the EGR pipe has a long length, which results in a poor EGR response.

이에 본 발명은 상기한 문제점을 감안하여 제안한 것으로서 그의 목적으로하는 것은 EGR 계통에 탄화물이 부착되는 것을 방지하며 EGR밸브의 열화를 방지할 수 있는 배기가스 재순환 공급장치(EGR)의 이물질 제거장치를 제공하는 데 있다.Accordingly, the present invention has been proposed in view of the above problems, and its object is to provide a debris removal device of an exhaust gas recirculation supply device (EGR) that can prevent carbides from adhering to the EGR system and prevent deterioration of the EGR valve. There is.

상기한 목적을 달성하기 위하여 본 발명은 배기매니폴드와 흡기매니폴드를 접속하는 배기가스 리턴 파이프의 도중에 설치되는 EGR 밸브를 포함하는 EGR 시스템에 있어서,In order to achieve the above object, the present invention provides an EGR system including an EGR valve provided in the middle of an exhaust gas return pipe connecting an exhaust manifold and an intake manifold.

상기 EGR 밸브의 입구측에 설치되는 미세 스크린 형상의 와이어 히터와;A fine screen-shaped wire heater installed at the inlet side of the EGR valve;

상기 와이어 히터의 전후 압력을 측정하기 위하여 설치되는 전,후압력계와;Before and after pressure gauge is installed to measure the pressure before and after the wire heater;

상기 전,후 압력계로부터 측정된 전,후압력차를 계산하는 차압센서와;A differential pressure sensor for calculating a before and after pressure difference measured from the before and after pressure gauges;

상기 차압센서에서 검출된 전,후압력차가 설정치를 넘으면 상기 와이어 히터에 전원을 공급토록 제어하는 전자제어장치;를 포함하여 구성되어 있다.And an electronic controller which controls to supply power to the wire heater when the before and after pressure difference detected by the differential pressure sensor exceeds a set value.

본 발명의 청구항 2 기재에 의하면 상기 전,후압력차가 설정치 이내이면 엔진의 점화 스위치가 오프되고 난 후 상기 전자제어장치가 상기 와이어 히터를 발열 제어하여 이물질을 소각시키게 되는 것을 특징으로 한다.According to the second aspect of the present invention, if the difference between the before and after pressure is within the set value, the electronic control device incinerates the foreign substance by controlling the heating of the wire heater after the ignition switch of the engine is turned off.

도 1은 본 발명에 의한 배기가스 재순환 공급장치의 이물질 제거장치를 나타내는 도면1 is a view showing a foreign material removal device of the exhaust gas recirculation supply apparatus according to the present invention

도2는 본 발명의 플로우챠트도이다.2 is a flowchart of the present invention.

※도면의 주요 부분에 대한 부호의 설명※ Explanation of code for main part of drawing

1 : 배기가스 리턴 파이프 2 : EGR밸브1: exhaust gas return pipe 2: EGR valve

4 : 하우징 5 : 다이어프램4 housing 5 diaphragm

6 : 스프링 7 : 작동로드6: spring 7: working rod

8 : 밸브 9 : 밸브시트8 valve 9 valve seat

10 : 입구부 11 : 와이어 히터10: inlet portion 11: wire heater

12,13 : 전,후압력계 14 : 차압센서12,13: front and rear pressure gauge 14: differential pressure sensor

15 : 전자제어장치15: electronic control device

이하 본 발명의 구성과 작용을 첨부한 도면을 참조하여 설명한다.Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

도1은 본 발명에 의한 배기가스 재순환 공급장치의 이물질 제거장치를 나타내는 도면이며, 도 2는 본 발명의 플로우챠트도이다.1 is a view showing a foreign material removal device of the exhaust gas recirculation supply apparatus according to the present invention, Figure 2 is a flow chart of the present invention.

부호 1은 배기매니폴드와 흡기매니폴드를 연결하는 배기가스 리턴파이프로서, 배기가스 리턴파이프(1)의 도중에는 EGR 밸브(2)가 설치되어 있다.Reference numeral 1 denotes an exhaust gas return pipe connecting the exhaust manifold and the intake manifold, and an EGR valve 2 is provided in the middle of the exhaust gas return pipe 1.

EGR 밸브(2)는 흡기계측에 접속된 파이프(3)를 통하여 하우징(4)내에 흡기부압이 작용하면 다이어프램(5)이 스프링(6)을 압축하면서 이동하게 되며, 이에 연동하여 움직이는 작동로드(7)끝의 밸브(8)가 밸브시트(9)로부터 떨어져 배기가스 리턴 파이프(1)를 개방하게 되어 있다.When the intake negative pressure acts on the housing 4 through the pipe 3 connected to the intake side, the EGR valve 2 moves while the diaphragm 5 compresses the spring 6 and moves in conjunction with the operation rod ( 7) The valve 8 at the end is separated from the valve seat 9 to open the exhaust gas return pipe 1.

밸브(8)가 열리면 배기매니폴드로 배출되는 배기가스의 일부가 개방된 배기가스리턴 파이프(1)를 통하여 흡기매니폴드로 공급되며, 혼합기와 함께 연소실에 유입되어 연소되어지게 된다.When the valve 8 is opened, a part of the exhaust gas discharged to the exhaust manifold is supplied to the intake manifold through the open exhaust gas return pipe 1 and is introduced into the combustion chamber together with the mixer to be combusted.

EGR 밸브(2)의 입구(10)쪽에는 미세한 발열선으로 만들어진 스크린 형상의 와이어 히터(11)가 파이프(1)의 단면적을 가로질러 설치되며, 와이어 히터(11)의 전후에는 각각 전후 압력을 검출하기 위한 전,후압력계(12)(13)가 설치되어 있다.On the inlet 10 side of the EGR valve 2, a screen-shaped wire heater 11 made of fine heating wires is installed across the cross-sectional area of the pipe 1, and the front and rear pressures are respectively detected before and after the wire heater 11. Before and after pressure gauges 12 and 13 are provided.

전,후압력계(12)(13)에서 측정된 압력정보는 차압센서(14)로 보내져 전,후압력차(P1-P2)가 계산되고, 그 전,후압력차(P1-P2) 정보는 전자제어장치(15)로 보내져 와이어 히터(11)의 작동 제어를 위한 정보로 이용된다.The pressure information measured by the before and after pressure gauges 12 and 13 is sent to the differential pressure sensor 14, and the before and after pressure difference P 1 -P 2 is calculated, and the before and after pressure difference P 1 -P. 2 ) The information is sent to the electronic controller 15 and used as information for controlling the operation of the wire heater 11.

이하 본 발명의 작동과정을 도 2의 플로우챠트에 의해 설명한다.Hereinafter, the operation of the present invention will be described by the flowchart of FIG. 2.

배기가스속에 포함된 탄화물(HC)이나 오일타르등이 와이어 히터(11)에 의해 포집되어 배기가스 흐름에 저항이 생기게 되면 와이어 히터(11) 전후에 압력차가 발생한다.Carbide HC, oil tar, and the like contained in the exhaust gas are collected by the wire heater 11 and resistance to the exhaust gas flow causes a pressure difference before and after the wire heater 11.

이때 전,후압력계(12)(13)에 의해 검출된 전방압력(P1)과 후방압력(P2)의 차(P1-P2)가 설정치인 ▲P보다 전,후압력차가 크다면 전자제어장치(15)는 와이어 히터(11)를 통전(릴레이를 제어)시켜 와이어 히터(11)가 발열하도록 제어한다(단계나).At this time, if the difference (P 1 -P 2 ) between the front pressure (P 1 ) and the rear pressure (P 2 ) detected by the front and rear pressure gauges (12, 13) is greater than the set value ▲ P, The electronic controller 15 controls the wire heater 11 to generate heat by energizing the wire heater 11 (controlling a relay) (step b).

그러나 전,후압력차(P1-P2)가 설정치보다 작으면 전자제어장치(15)는 와이어 히터(11)에의 전원을 공급하지 아니한다.However, if the front and rear pressure difference P 1 -P 2 is smaller than the set value, the electronic controller 15 does not supply power to the wire heater 11.

와이어 히터(11)가 고온으로 발열되면 와이어 히터(11)의 철망에 걸러진 탄화물등의 이물질이 소각되어지게 되며, 연소가 완료되는 시간에 전자제어장치(15)는 와이어 히터(11)에의 전원 공급을 차단하게 된다.When the wire heater 11 is heated to a high temperature, foreign substances such as carbides caught in the wire mesh of the wire heater 11 are incinerated, and at the time when combustion is completed, the electronic controller 15 supplies power to the wire heater 11. Will block.

또 전,후 압력차가 설정치보다 작은 경우에는 점화스위치의 오프시에 와이어 히터(11)를 발열시켜 퇴적물을 소각처리하므로써 다음번 엔진 운전을 위한 준비를 미리 할 수 있다(단계다).If the difference in pressure before and after the set value is smaller than the set value, the wire heater 11 is heated to incinerate the deposit when the ignition switch is turned off, thereby preparing for the next engine operation in advance (step).

이상과 같은 본 발명에 의하면 EGR 밸브를 배기매니폴드가 아닌 배기가스 리턴 파이프의 도중에 설치하게되므로 다이어프램등이 열화되는 현상을 방지할 수 있으며, EGR 밸브의 입구부에는 발열장치이자 이물질의 여과기능을 가진 와이어 히터를 설치하고, 그 와이어 히터의 전후 압력차를 측정하여 와이어 히터가 이물질에 의해 막혀 압력차가 크게 발생하면 와이어 히터를 발열시켜 탄화물등의 이물질을 소각처리하게 되므로써 EGR 밸브의 퇴적물 침적에 의한 오동작을 방지하고 정확한 EGR 제어가 가능하며 신뢰성이 향상되고 엔진 출력 저하 및 배기가스 저감 효과를 얻을 수 있다.According to the present invention as described above, since the EGR valve is installed in the middle of the exhaust gas return pipe instead of the exhaust manifold, the diaphragm and the like can be prevented from deteriorating. Install the excitation wire heater and measure the front and back pressure difference of the wire heater. If the wire heater is blocked by foreign substances and the pressure difference is large, heat generation of the wire heater causes incineration of foreign substances such as carbides. It prevents malfunctions, enables accurate EGR control, improves reliability, and reduces engine power and reduces emissions.

Claims (2)

배기매니폴드와 흡기매니폴드를 접속하는 배기가스 리턴 파이프의 도중에 설치되는 EGR 밸브를 포함하는 EGR 시스템에 있어서,An EGR system comprising an EGR valve provided in the middle of an exhaust gas return pipe connecting an exhaust manifold and an intake manifold. 상기 EGR 밸브의 입구측에 설치되는 미세 스크린 형상의 와이어 히터와;A fine screen-shaped wire heater installed at the inlet side of the EGR valve; 상기 와이어 히터의 전,후압력을 측정하기 위하여 설치되는 전,후압력계와;Before and after pressure gauge is installed to measure the pressure before and after the wire heater; 상기 전,후압력계로부터 측정된 전,후압력차를 계산하는 차압센서와;A differential pressure sensor for calculating a before and after pressure difference measured from the before and after pressure gauges; 상기 차압센서에서 검출된 전,후압력차가 설정치를 넘으면 상기 와이어 히터에 전원을 공급토록 제어하는 전자제어장치;를 포함하여 구성 하는 것을 특징으로 하는 배기가스 재순환 공급장치(EGR)의 이물질 제거장치.And an electronic controller for controlling power to be supplied to the wire heater when a difference between the front and rear pressures detected by the differential pressure sensor exceeds a set value. 제 1 항에 있어서,The method of claim 1, 상기 전,후압력차가 설정치 이내이면 엔진의 점화스위치가 오프되고 난 후 상기 전자제어장치가 상기 와이어 히터를 발열 제어 하여 잔류 이물질을 소각시키게 되는 것을 특징으로 하는 배기가스 재순환 공급장치(EGR)의 이물질 제거장치.The foreign matter of the exhaust gas recirculation supply device (EGR) is characterized in that after the ignition switch of the engine is turned off if the before and after pressure difference is within the set value, the electronic control device incinerates the residual foreign matter by heating the wire heater. Removal device.
KR1019990067604A 1999-12-31 1999-12-31 Carbide deposit removing apparatus in EGR valve seat KR100343995B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100622385B1 (en) * 2004-11-25 2006-09-19 현대자동차주식회사 A carbon burning system of recirculation device of exhausted gas
KR101222821B1 (en) * 2011-08-29 2013-01-28 우진공업주식회사 Air heater for heating inhaling air in internal combustion engine
KR20150108411A (en) * 2013-02-25 2015-09-25 요코하마 고무 가부시키가이샤 Rubber composition for tire for heavy loads, and pneumatic tire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100622385B1 (en) * 2004-11-25 2006-09-19 현대자동차주식회사 A carbon burning system of recirculation device of exhausted gas
KR101222821B1 (en) * 2011-08-29 2013-01-28 우진공업주식회사 Air heater for heating inhaling air in internal combustion engine
KR20150108411A (en) * 2013-02-25 2015-09-25 요코하마 고무 가부시키가이샤 Rubber composition for tire for heavy loads, and pneumatic tire

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