KR20000018894A - Catalysis controlling method and device of inner combustion engine - Google Patents

Catalysis controlling method and device of inner combustion engine Download PDF

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Publication number
KR20000018894A
KR20000018894A KR1019980036730A KR19980036730A KR20000018894A KR 20000018894 A KR20000018894 A KR 20000018894A KR 1019980036730 A KR1019980036730 A KR 1019980036730A KR 19980036730 A KR19980036730 A KR 19980036730A KR 20000018894 A KR20000018894 A KR 20000018894A
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South Korea
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ignition
catalyst
exhaust gas
exhaust pipe
starting
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KR1019980036730A
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Korean (ko)
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김인탁
조용석
명차리
이윤석
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정몽규
현대자동차 주식회사
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Priority to KR1019980036730A priority Critical patent/KR20000018894A/en
Priority to JP11252050A priority patent/JP2000087735A/en
Priority to DE19942711A priority patent/DE19942711A1/en
Publication of KR20000018894A publication Critical patent/KR20000018894A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/204—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using an exhaust gas igniter, e.g. a spark or glow plug, without introducing fuel into exhaust duct
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

PURPOSE: A catalysis controlling method and a device of an inner combustion engine are provided to make the catalysis approach the reacting temperature by burning mixed gas in an exhaust gas pipe before starting. CONSTITUTION: A method comprises the steps of: cutting off the ignition signal supplied from an ignition module(7) to an ignition plug; supplying the ignition signal from the ignition module to the glow plug(13) installed on the front exhaust gas pipe(9) of the catalysis; discharging the unburned mixed gas from a combustion chamber by operating a starting motor(10) for a certain period, burning in the exhaust gas pipe and reducing the density of the THC and CO contained in the exhaust gas even at starting or idle by making the catalysis approach to the reacting temperature before starting.; Herein, the glow plug installed on the exhaust gas pipe makes the catalysis approach to the reacting temperature in the exhaust gas pipe not in a combustion chamber before starting, and the density of the THC and CO contained in the exhaust gas can be reduced even when starting or being idle.

Description

내연기관의 촉매 제어 방법 및 장치Method and apparatus for controlling catalyst in internal combustion engine

본 발명은 내연기관의 촉매 제어에 관한 것으로서, 보다 상세하게는 시동전에 혼합기를 배기 파이프에서 연소시켜 촉매를 반응온도에 이르게 하는 내연기관의 촉매 제어 방법 및 장치에 관한 것이다.TECHNICAL FIELD The present invention relates to catalyst control of an internal combustion engine, and more particularly, to a method and apparatus for controlling a catalyst of an internal combustion engine, in which a mixer is combusted in an exhaust pipe before starting to bring the catalyst to a reaction temperature.

일반적으로 내연기관의 촉매는 배기 파이프에 촉매 컨버터의 형식으로 구비된다. 이 촉매는 배출가스에 포함된 총탄화수소(THC), 일산화탄소(CO) 그리고 질소산화물(NOx) 등을 산화 또는 환원시켜 배출가스를 청정하게 한다.In general, the catalyst of the internal combustion engine is provided in the form of a catalytic converter in the exhaust pipe. The catalyst oxidizes or reduces total hydrocarbons (THC), carbon monoxide (CO) and nitrogen oxides (NO x ) contained in the exhaust gas to clean the exhaust gas.

촉매가 THC, CO, NOx을 산화, 환원시키려면, 촉매는 일정 수준의 반응온도를 유지하여야 한다. 따라서 통상적으로 내연기관은 냉간 시동 및 아이들 운전시 매연, THC, CO, NOx을 다량 함유한 가스를 배출한다. 이는 배기 파이프에 구비된 촉매가 산화, 환원 반응에 요구되는 반응온도 수준까지 도달하지 못하여, THC, CO, NOx이 반응하지 못하고 그대로 배출되기 때문이다.In order for the catalyst to oxidize and reduce THC, CO and NO x , the catalyst must maintain a constant reaction temperature. Therefore, internal combustion engines typically emit gases containing large amounts of soot, THC, CO and NO x during cold start and idle operation. This is because the catalyst provided in the exhaust pipe does not reach the reaction temperature level required for the oxidation and reduction reaction, and THC, CO, and NO x are not reacted and are discharged as they are.

촉매가 반응온도 수준까지 도달하지 못하였을 때 발생되는 THC와 CO의 농도를 살펴보면, 도 2,3에 도시된 바와 같이, 곡선 a,b로 나타난다. 즉, 시동시 THC와 CO의 농도가 급격히 증가한 후, 아이들시 일정한 농도 수준으로 저감되고, 그 후, 더 이상 줄어들지 않음을 볼 수 있다.Looking at the concentration of THC and CO generated when the catalyst did not reach the reaction temperature level, as shown in Figures 2, 3, it is shown by the curve a, b. That is, it can be seen that the concentration of THC and CO at start-up is sharply increased, then reduced to a constant concentration level at idle, and then no longer reduced.

이러한 현상을 방지하기 위하여, 시동 및 아이들시, 촉매를 가열하는 방법이 상당 수 공지되어 있다. 즉, 열선을 촉매에 설치하거나, 배출가스를 촉매 주위에 순환시키는 등이 있다.In order to prevent this phenomenon, a number of methods for heating the catalyst during startup and idling are known. That is, a heating wire is installed in a catalyst, or exhaust gas is circulated around a catalyst.

따라서 본 발명은 상기와 같은 점을 감안하여 발명된 것으로서, 본 발명의 목적은 시동전에 혼합기를 촉매전의 배기 파이프에서 연소하여 촉매를 반응온도에 이르게 하는 내연기관의 촉매 제어 방법 및 장치를 제공하는 데 있다.Therefore, the present invention has been invented in view of the above, and an object of the present invention is to provide a method and apparatus for controlling a catalyst in an internal combustion engine, in which a mixer is combusted in an exhaust pipe before a catalyst before starting to bring the catalyst to a reaction temperature. have.

도 1은 본 발명에 관련된 내연기관의 간략한 구성도이다.1 is a schematic configuration diagram of an internal combustion engine according to the present invention.

도 2는 시간의 경과에 따라 배출되는 총탄화수소의 농도를 베이스 라인과 대비하여 나타낸 그래프이다.Figure 2 is a graph showing the concentration of total hydrocarbons discharged over time compared to the baseline.

도 3은 시간의 경과에 따라 배출되는 일산화탄소의 농도를 베이스 라인과 대비하여 나타낸 그래프이다.Figure 3 is a graph showing the concentration of carbon monoxide discharged over time compared to the baseline.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for main parts of the drawings>

7:점화모듈 9:배기 파이프 10:시동모터 11:촉매 13:글로우 플러그 15:제어로직 모듈7: Ignition module 9: Exhaust pipe 10: Starting motor 11: Catalyst 13: Glow plug 15: Control logic module

이를 실현하기 위하여 본 발명에 따른 내연기관의 촉매 제어 방법은 시동키의 조작으로 시동모터를 기동하고 점화신호를 점화모듈에서 점화플러그로 공급하여 연소실에서 연소된 가스를 촉매가 구비된 배기 파이프로 배출시키는 내연기관에서,In order to realize this, the catalyst control method of the internal combustion engine according to the present invention starts the starting motor by operating the starter key and supplies an ignition signal to the ignition plug from the ignition module to discharge the gas burned from the combustion chamber to the exhaust pipe equipped with the catalyst. In internal combustion engines,

점화모듈에서 점화플러그로 공급되는 점화신호를 차단하고, 점화신호를 점화모듈에서 촉매의 전방 배기 파이프에 설치된 글로우 플러그로 공급하며, 시동모터를 일정시간 작동시켜 미연소 혼합기를 연소실에서 그대로 배출하여 배기 파이프에서 연소시켜,The ignition signal is cut off from the ignition module to the spark plug, the ignition signal is supplied from the ignition module to the glow plug installed in the exhaust pipe of the catalyst, and the starter motor is operated for a certain time to discharge the unburned mixer from the combustion chamber. Burn in a pipe,

시동전에 촉매를 반응온도에 이르게 하여 시동 및 아이들시에도 배출가스에 포함된 THC, CO의 농도를 저감시킨다.The catalyst is brought to the reaction temperature before starting, thereby reducing the concentration of THC and CO contained in the exhaust gas during starting and idling.

또 본 발명에 따른 내연기관의 촉매 제어 장치는 시동키의 조작으로 시동모터를 기동하고 점화신호를 점화모듈에서 점화플러그로 공급하여 연소실에서 연소된 가스를 촉매가 구비된 배기 파이프로 배출시키는 내연기관에서,In addition, the catalyst control apparatus of the internal combustion engine according to the present invention starts the starting motor by operating the start key and supplies an ignition signal from the ignition module to the ignition plug to discharge the gas burned in the combustion chamber to the exhaust pipe equipped with the catalyst. in,

촉매의 전방 배기 파이프에 설치된 글로우 플러그와, 점화모듈의 점화신호를 점화플러그와 글로우 플러그에 선택적으로 공급하는 제어로직 모듈을 포함하며,It includes a glow plug installed in the exhaust pipe of the catalyst, and a control logic module for selectively supplying the ignition signal of the ignition module to the spark plug and the glow plug,

시동모터를 일정시간 작동시켜 미연소 혼합기를 연소실에서 그대로 배출하여 배기 파이프에서 연소시키므로 시동전에 촉매를 반응온도에 이르게 하여 시동 및 아이들시에도 배출가스에 포함된 THC와 CO의 농도를 저감시키도록 이루어진다.Since the starter motor is operated for a certain time, the unburned mixer is discharged from the combustion chamber as it is and burned in the exhaust pipe. Thus, the catalyst is brought to the reaction temperature before the start-up to reduce the concentration of THC and CO contained in the exhaust gas during start-up and idle. .

이하 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 보다 상세히 설명한다.BEST MODE Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 관련된 내연기관의 간략한 구성도이다. 이 내연기관(1)은 흡기매니폴드(3)로 혼합기를 흡입하여 연소실(미도시)에서 연소시키고, 연소된 가스를 배기 매니폴드(5)로 배출하도록 구성된다.1 is a schematic configuration diagram of an internal combustion engine according to the present invention. The internal combustion engine 1 is configured to suck the mixer into the intake manifold 3 to burn it in a combustion chamber (not shown), and to discharge the burned gas to the exhaust manifold 5.

점화신호는 시동키(미도시)의 조작에 따라 점화모듈(7)로부터 공급된다. 배기 매니폴드(5)에는 연소된 가스를 대기로 유도하는 배기 파이프(9)가 연결되고, 이 배기 파이프(9)에는 배출가스를 산화 또는 환원 반응시키는 촉매(11)가 설치되어 있다.The ignition signal is supplied from the ignition module 7 according to the operation of the ignition key (not shown). The exhaust manifold 5 is connected with an exhaust pipe 9 for guiding the combusted gas to the atmosphere, and the exhaust pipe 9 is provided with a catalyst 11 for oxidizing or reducing the exhaust gas.

이 촉매(11)의 전방 배기 파이프(9)에는 시동전 촉매(11)를 가열시키기 위한 글로우 플러그(13)가 설치되어 있다. 점화모듈(7)에는 제어로직 모듈(15)이 연결되어 점화신호를 점화플러그(미도시)와 글로우 플러그(13) 중 어느 한 곳에 선택적으로 공급하도록 연결된다. 즉, 제어로직 모듈(15)의 조작으로 시동전에는 점화신호가 글로우 플러그(13)로 공급되고, 제어로직 모듈(15)의 스위칭 조작으로 시동 및 시동이후에는 점화신호가 점화플러그로 공급된다.The glow plug 13 for heating the catalyst 11 before starting is provided in the front exhaust pipe 9 of this catalyst 11. The control logic module 15 is connected to the ignition module 7 so as to selectively supply the ignition signal to any one of the ignition plug (not shown) and the glow plug 13. That is, the ignition signal is supplied to the glow plug 13 before starting by the operation of the control logic module 15, and the ignition signal is supplied to the ignition plug after starting and starting by the switching operation of the control logic module 15.

상술한 바와 같이 구성된 내연기관에서 시동 및 아이들시, THC, CO의 배출을 감소시키기 위하여, 시동전에 촉매(11)를 가열시키는 제어를 한다.In the internal combustion engine configured as described above, in order to reduce the emission of THC and CO during start-up and idle, control to heat the catalyst 11 before start-up is performed.

즉, 시동키를 조작하기 전에, 먼저 제어로직 모듈(15)이 점화모듈(7)에서 점화플러그로 공급되는 점화신호를 차단하여 글로우 플러그(13)로 공급한다.That is, before operating the ignition key, the control logic module 15 first blocks the ignition signal supplied from the ignition module 7 to the ignition plug and supplies it to the glow plug 13.

이러한 상태에서 일정 시간동안 시동키를 조작한다. 따라서 시동모터(미도시)가 일정 시간동안 작동된다. 결국, 흡기매니폴드(3)로 흡입되는 혼합기는 연소실에서 연소되지 못하고 배기 매니폴드(5)를 통하여 그대로 배출된다.In this state, operate the ignition key for a certain time. Therefore, the starting motor (not shown) is operated for a certain time. As a result, the mixer sucked into the intake manifold 3 is not burned in the combustion chamber but is discharged as it is through the exhaust manifold 5.

이렇게 배출되는 미연소의 혼합기는 배기 파이프(9)를 경유한다. 이 때 글로우 플러그(13)가 점화되어 촉매(11)가 설치된 배기 파이프(9)에서 미연소 혼합기를 연소시킨다. 이때 발생되는 연소열은 촉매(11)에 직접 작용하게 되어, 시동전에 촉매(11)를 반응온도에 이르게 한다.The unburned mixer thus discharged is via the exhaust pipe 9. At this time, the glow plug 13 is ignited to burn the unburned mixer in the exhaust pipe 9 provided with the catalyst 11. The heat of combustion generated at this time acts directly on the catalyst 11, bringing the catalyst 11 to the reaction temperature before starting.

그 후, 엔진 및 촉매(11)가 난기 상태에 도달하면, 제어로직 모듈(15) 상태가 바뀌어, 글로우 플러그(13)로 공급되던 점화신호가 점화플러그로 공급된다. 따라서 흡기매니폴드(3)로 흡입되는 혼합기는 연소실에서 연소되면서 내연기관(1)을 시동시킨다.After that, when the engine and the catalyst 11 reach the warm state, the state of the control logic module 15 is changed, and the ignition signal supplied to the glow plug 13 is supplied to the ignition plug. Therefore, the mixer sucked into the intake manifold 3 starts the internal combustion engine 1 while burning in the combustion chamber.

이 때, 촉매(11)를 통하여 배기 파이프(9)로 배출되는 배출가스에 포함된 THC, CO의 농도는 도 2,3의 곡선 c,d와 같이 나타난다. 즉, 시동시에만 THC, CO의 농도가 나타나며 아이들시에는 영으로 나타난다. 시동시에도 THC, CO의 농도는 베이스 라인보다 낮게 나타난다.At this time, the concentration of THC, CO contained in the exhaust gas discharged to the exhaust pipe 9 through the catalyst 11 is shown as curves c, d of Figs. That is, the concentration of THC and CO appears only at start-up and zero at idle. At start-up, the concentrations of THC and CO are lower than the baseline.

따라서 본 실시예의 촉매 제어 방법 및 장치는 시동 및 아이들시에도 배출가스에 포함된 THC, CO의 농도를 저감시킨다.Therefore, the catalyst control method and apparatus of the present embodiment reduce the concentration of THC and CO contained in the exhaust gas even at startup and idle time.

본 발명은 배기 파이프에 글로우 플러그를 설치하여, 시동전에 혼합기를 연소실이 아닌 배기 파이프에서 연소하여 촉매를 반응온도에 이르게 하므로 시동 및 아이들시에도 배출가스에 포함된 THC, CO의 농도를 저감시킬 수 있다. 그리고 본 발명은 촉매를 가열시키는 구조 및 제어를 간단하게 한다.In the present invention, by installing a glow plug on the exhaust pipe, the mixture is combusted in the exhaust pipe, not the combustion chamber, before the start-up, so that the catalyst reaches the reaction temperature, thus reducing the concentration of THC and CO contained in the exhaust gas during start-up and idle. have. And the present invention simplifies the structure and control of heating the catalyst.

Claims (2)

시동키의 조작으로 시동모터를 기동하고 점화신호를 점화모듈에서 점화플러그로 공급하여 연소실에서 연소된 가스를 촉매가 구비된 배기 파이프로 배출시키는 내연기관에서,In the internal combustion engine which starts the starting motor by the operation of the ignition key and supplies the ignition signal from the ignition module to the ignition plug and discharges the gas burned in the combustion chamber to the exhaust pipe equipped with a catalyst. 상기 점화모듈에서 상기 점화플러그로 공급되는 점화신호를 차단하고,Cut off the ignition signal supplied from the ignition module to the ignition plug, 상기 점화신호를 상기 점화모듈에서 상기 촉매의 전방 배기 파이프에 설치된 글로우 플러그로 공급하며,The ignition signal is supplied from the ignition module to a glow plug installed in the front exhaust pipe of the catalyst, 상기 시동모터를 일정시간 작동시켜 미연소 혼합기를 연소실에서 그대로 배출하여 상기 배기 파이프에서 연소시켜,By operating the starting motor for a predetermined time to discharge the unburned mixer in the combustion chamber as it is, to burn in the exhaust pipe, 시동전에 상기 촉매를 반응온도에 이르게 하여 시동 및 아이들시에도 배출가스에 포함된 THC, CO의 농도를 저감시키는 내연기관의 촉매 제어 방법.A method of controlling a catalyst in an internal combustion engine, in which the catalyst is brought to a reaction temperature before starting, thereby reducing the concentration of THC and CO contained in the exhaust gas even at starting and idling. 시동키의 조작으로 시동모터를 기동하고 점화신호를 점화모듈에서 점화플러그로 공급하여 연소실에서 연소된 가스를 촉매가 구비된 배기 파이프로 배출시키는 내연기관에서,In the internal combustion engine which starts the starting motor by the operation of the ignition key and supplies the ignition signal from the ignition module to the ignition plug and discharges the gas burned in the combustion chamber to the exhaust pipe equipped with a catalyst. 상기 촉매의 전방 상기 배기 파이프에 설치된 글로우 플러그와,A glow plug installed in the exhaust pipe in front of the catalyst; 상기 점화모듈의 점화신호를 상기 점화플러그와 상기 글로우 플러그에 선택적으로 공급하는 제어로직 모듈을 포함하여,Including a control logic module for selectively supplying the ignition signal of the ignition module to the ignition plug and the glow plug, 상기 시동모터를 일정시간 작동시켜 미연소 혼합기를 연소실에서 그대로 배출하여 상기 배기 파이프에서 연소시키므로 시동전에 상기 촉매를 반응온도에 이르게 하여 시동 및 아이들시에도 배출가스에 포함된 THC, CO의 농도를 저감시키는 내연기관의 촉매 제어 장치.By operating the starter motor for a certain time, the unburned mixer is discharged from the combustion chamber as it is and burned in the exhaust pipe. Thus, the catalyst is brought to the reaction temperature before starting, thereby reducing the concentration of THC and CO contained in the exhaust gas during start-up and idle. Catalyst control apparatus of the internal combustion engine to make.
KR1019980036730A 1998-09-07 1998-09-07 Catalysis controlling method and device of inner combustion engine KR20000018894A (en)

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KR1019980036730A KR20000018894A (en) 1998-09-07 1998-09-07 Catalysis controlling method and device of inner combustion engine
JP11252050A JP2000087735A (en) 1998-09-07 1999-09-06 Catalyst control method and unit for internal combustion engine
DE19942711A DE19942711A1 (en) 1998-09-07 1999-09-07 Control system activating glow plug in exhaust pipe ahead of catalyst

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160073493A (en) 2014-12-16 2016-06-27 주식회사 포스코 Method for manufacturing of galvanized steel sheet to improve an elogation and galvanized steel sheet manufactured thereby
KR20160074753A (en) 2014-12-18 2016-06-29 주식회사 포스코 Galvanized steel sheet having excellent elogation and method for manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160073493A (en) 2014-12-16 2016-06-27 주식회사 포스코 Method for manufacturing of galvanized steel sheet to improve an elogation and galvanized steel sheet manufactured thereby
KR20160074753A (en) 2014-12-18 2016-06-29 주식회사 포스코 Galvanized steel sheet having excellent elogation and method for manufacturing the same

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