KR100962812B1 - Apparatus for decreasing exhaust gas - Google Patents

Apparatus for decreasing exhaust gas Download PDF

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KR100962812B1
KR100962812B1 KR1020070131477A KR20070131477A KR100962812B1 KR 100962812 B1 KR100962812 B1 KR 100962812B1 KR 1020070131477 A KR1020070131477 A KR 1020070131477A KR 20070131477 A KR20070131477 A KR 20070131477A KR 100962812 B1 KR100962812 B1 KR 100962812B1
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oxygen
exhaust gas
unit
injection
compression
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KR1020070131477A
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Korean (ko)
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KR20090063941A (en
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박진우
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현대자동차주식회사
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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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

본 발명은 디젤엔진 배기가스 저감 장치에 관한 것으로, 일측에 산소 분사 신호에 따라 압축되어 있던 산소를 분사하는 산소압축/분사부; 및 배기가스의 산소량을 감지하여 상기 산소량이 소정의 기준 산소량 미만인 경우에 상기 산소압축/분사부로 상기 산소 분사 신호를 인가하는 산소 감지부를 포함함으로써, CPF 전단의 산소량을 일정 수준 이상으로 유지할 수 있어 LNT 탈황과 CPF 재생의 연비를 개선시킬 수 있다.The present invention relates to a diesel engine exhaust gas reduction device, an oxygen compression / injection unit for injecting oxygen compressed on one side according to the oxygen injection signal; And an oxygen sensing unit for sensing the oxygen amount of the exhaust gas and applying the oxygen injection signal to the oxygen compression / injection unit when the oxygen amount is less than a predetermined reference oxygen amount, thereby maintaining the oxygen amount at the front end of the CPF at a predetermined level or more. Improve fuel economy of desulfurization and CPF regeneration.

배기가스, CPF, LNT Exhaust Gas, CPF, LNT

Description

디젤엔진 배기가스 저감 장치{Apparatus for decreasing exhaust gas}Apparatus for decreasing exhaust gas

본 발명은 디젤엔진 배기가스 저감 장치에 관한 것이다.The present invention relates to a diesel engine exhaust gas reduction device.

일반적으로, 디젤 자동차에 적용되는 엔진은 뛰어난 연비, 출력 등에도 불구하고, 디젤 엔진의 특성상 공기 과잉율이 큰 상태에서 연소가 이루어지기 때문에 배출가스 중에는 가솔린 엔진과는 달리 일산화탄소(CO)나 탄화수소(HC)의 배출량이 적은 반면 질소산화물(이하, "NOx" 라 한다.)과 입자성물질(PM)이 상당히 많이 배출되는 단점이 있다.In general, engines applied to diesel vehicles are burned in a state where the excess air is high due to the characteristics of diesel engines, despite excellent fuel economy and power output, and unlike exhaust gasoline engines, carbon monoxide (CO) or hydrocarbon ( It has a disadvantage that HC emissions are low, but nitrogen oxides (hereinafter referred to as "NOx") and particulate matter (PM) are discharged considerably.

특히, 최근들어 입자상 물질(PM)은 대기를 오염시키는 가장 중요한 주원인으로 각종 매체에서 보도되고, 인체에 많은 해를 미친다.Particularly, particulate matter (PM) has recently been reported in various media as the most important cause of air pollution, and causes many harm to human body.

이러한 입자상 물질(PM)을 저감시키는 방법으로서 디젤 자동차에 디젤 입자상 물질필터(CPF)를 장착하고 있다. As a method of reducing such particulate matter PM, a diesel particulate filter CPF is attached to a diesel vehicle.

디젤 입자상 물질필터(CPF)는 디젤 엔진으로부터 배출되는 입자상 물질(PM)을 필터내에 물리적으로 포집후 후분사 제어(Post Injection)로 배기가스의 온도를 일정온도 이상으로 승온하여 필터에 포집된 입자상 물질(PM)을 연소시켜 제거한다.The diesel particulate filter (CPF) collects particulate matter (PM) discharged from a diesel engine in the filter and collects particulate matter collected in the filter by raising the temperature of the exhaust gas above a certain temperature by post injection control. (PM) is burned and removed.

그러나, 종래기술에서 LNT(Lean Nox Trap) 탈황 중 스투(soot)가 다량 발생 함에 따라 산소가 희박해저 CPF(Catalyzed Particulate Filter) 내부에 스투가 다량 쌓여 LNT 탈황 또는 CPF 재생의 별도의 과정을 진행함에 따라 연비가 손실된다.However, in the prior art, as a large amount of soot occurs during the desulfurization of LNT (Lean Nox Trap), oxygen is scarce and a large amount of studs are accumulated inside the Catalyzed Particulate Filter (CPF) to proceed with a separate process of LNT desulfurization or CPF regeneration. As a result, fuel economy is lost.

본 발명은 CPF 전단의 산소 농도를 일정 수준 이상으로 유지하여 LNT 탈황과 CPF 재생의 연비를 개성을 시키기 위한 디젤엔진 배기가스 저감 장치에 관한 것이다.The present invention relates to a diesel engine exhaust gas reducing device for maintaining the oxygen concentration of the front end of the CPF above a certain level to improve the fuel efficiency of LNT desulfurization and CPF regeneration.

본 발명은 일측에 산소 분사 신호에 따라 압축되어 있던 산소를 분사하는 산소압축/분사부; 및 배기가스의 산소량을 감지하여 상기 산소량이 소정의 기준 산소량 미만인 경우에 상기 산소압축/분사부로 상기 산소 분사 신호를 인가하는 산소감지부를 포함하는 머플러부로 이루어진다.The present invention provides an oxygen compression / injection unit for injecting oxygen compressed on one side according to an oxygen injection signal; And an oxygen detector configured to sense an oxygen amount of the exhaust gas and to apply the oxygen injection signal to the oxygen compression / injection unit when the oxygen amount is less than a predetermined reference oxygen amount.

본 발명은 CPF 전단의 산소 농도를 일정 수준 이상으로 유지할 수 있어 LNT 탈황과 CPF 재생의 연비를 개선시킬 수 있다.The present invention can maintain the oxygen concentration of the CPF front end above a certain level can improve the fuel efficiency of LNT desulfurization and CPF regeneration.

본 발명은 산소 분사 신호에 따라 압축되어 있던 산소를 분사하는 산소압축/분사부; 및 배기가스의 산소량을 감지하여 상기 산소량이 소정의 기준 산소량 미만인 경우에 상기 산소압축/분사부로 상기 산소 분사 신호를 인가하는 산소 감지부를 포함하는 머플러부로 이루어진다.The present invention provides an oxygen compression / injection unit for injecting oxygen compressed according to an oxygen injection signal; And an oxygen detecting unit configured to sense an oxygen amount of the exhaust gas and to apply the oxygen injection signal to the oxygen compression / injection unit when the oxygen amount is less than a predetermined reference oxygen amount.

본 발명에서 상기 산소압축/분사부측의 상기 머플러부에 연결되어 질소산화물(예컨대, NOx)을 저감시키는 흡장 촉매부를 더 포함한다.In the present invention, it further comprises an occlusion catalyst unit connected to the muffler unit on the oxygen compression / injection unit side to reduce nitrogen oxides (eg, NOx).

또한, 본 발명에서 상기 산소 감지부측의 상기 머플러부에 연결되어 상기 배기 가스에서 입자상 물질(PM:Particulate Matters)을 저감시키는 입자성 물질 필터부를 더 포함한다.In addition, the present invention further includes a particulate matter filter unit connected to the muffler unit on the oxygen sensing unit side to reduce particulate matter (PM) in the exhaust gas.

이하, 본 발명의 바람직한 실시예를 첨부된 도면들을 참조하여 상세히 설명한다. 또한, 본 발명을 설명함에 있어, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

실시예Example

도 1은 본 발명에 따른 디젤엔진 배기가스 저감 장치를 나타낸 블록도이다.1 is a block diagram showing a diesel engine exhaust gas reduction apparatus according to the present invention.

도 1에서 나타낸 바와 같이, 디젤엔진 배기가스 저감장치(100)는 흡장 촉매부(LNT)(102), 산소압축/분사부(104), 머플러부(106), 산소 감지부(108) 및 입자성 물질 필터부(110)로 이루어진다.As shown in FIG. 1, the diesel engine exhaust gas reducing device 100 includes an occlusion catalyst unit (LNT) 102, an oxygen compression / injection unit 104, a muffler unit 106, an oxygen detection unit 108, and particles. The material filter unit 110 is formed.

흡장 촉매부(LNT)(102)는 질소산화물(예컨대, NOx)을 저감시키고, 산소압축/분사부(104)는 공기를 압축하고 있는 상태에서 분사신호에 따라 공기를 분사하며, 머플러부(106)는 엔진에서 배출되는 연소 배기가스를 외부로 배출시킴과 동시에 배기 소음을 저감시킨다.The occlusion catalyst unit (LNT) 102 reduces nitrogen oxides (eg, NOx), and the oxygen compression / injection unit 104 injects air in accordance with the injection signal while compressing the air, and the muffler unit 106. ) Exhausts combustion exhaust gas from the engine to the outside and reduces exhaust noise.

산소 감지부(108)는 머플러부(106)를 통과한 배기 가스의 산소량을 감지하여 기 설정된 산소량보다 작은 경우에 산소 분사 신호를 산소압축/분사부(104)로 인가한다. The oxygen detector 108 detects the amount of oxygen in the exhaust gas passing through the muffler unit 106 and applies an oxygen injection signal to the oxygen compression / injection unit 104 when it is smaller than the preset amount of oxygen.

입자성 물질 필터부(CPF:Catalyzed Particulate Filter)(110)는 머플러 부(106)를 통과한 배기가스에서 입자상 물질(PM:Particulate Matters)을 저감 시킨다.The particulate matter filter unit (CPF) 110 reduces particulate matter (PM) in the exhaust gas passing through the muffler unit 106.

여기서, 산소압축/분사부(104) 및 산소 감지부(108)는 각각 흡장 촉매부(LNT)(102) 측 및 입자성 물질 필터부(110) 측의 머플러부(106) 내부에 위치하는 것이 바람직하다.Here, the oxygen compression / injection unit 104 and the oxygen detection unit 108 are located inside the muffler unit 106 on the side of the occlusion catalyst unit (LNT) 102 and the particulate matter filter unit 110, respectively. desirable.

이하, 디젤엔진 배기가스 저감 장치에 동작 설명을 한다.Hereinafter, operation of the diesel engine exhaust gas reducing device will be described.

산소 감지부(108)는 흡장 촉매부(LNT)(102) 및 머플러부(106)를 통과한 배기 가스의 산소량을 감지하여 감지한 산소량이 기 설정된 산소량보다 작은 경우에 산소 분사 신호를 산소압축/분사로(104)부 인가한다.The oxygen detector 108 detects the amount of oxygen in the exhaust gas that has passed through the occlusion catalyst unit (LNT) 102 and the muffler unit 106 and, when the detected oxygen amount is smaller than the preset oxygen amount, compresses the oxygen injection signal. Part of the injection furnace 104 is applied.

그러면, 산소압축/분사부(104)는 흡장 촉매부(102)를 통과하는 배기가스에 소정의 산소량을 분사한다.Then, the oxygen compression / injection section 104 injects a predetermined amount of oxygen into the exhaust gas passing through the storage catalyst section 102.

이에, 디젤엔진 배기가스 저감 장치(100)는 배기 가스에 산소량이 첨가된 배기가스에서 입자상 물질(PM:Particulate Matters)을 저감 시킨다.Accordingly, the diesel engine exhaust gas reduction apparatus 100 reduces particulate matter (PM) in the exhaust gas to which the oxygen amount is added to the exhaust gas.

상술한 바와 같이 본 발명은 입자성 물질 필터부 전단의 산소 량을 일정 수준 이상으로 유지시킴으로써, 흡장 촉매부 또는 입자성 물질 필터부의 재생 연비를 개선시킬 수 있다.As described above, the present invention can improve the regeneration fuel efficiency of the storage catalyst portion or the particulate matter filter portion by maintaining the amount of oxygen at the front end of the particulate matter filter portion.

이상의 설명은 본 발명의 기술 사상을 예시적으로 설명한 것에 불과한 것으로서, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 다양한 수정 및 변형이 가능할 것이다. 따라서, 본 발명에 개시된 실시예들은 본 발명의 기술 사상을 한정하기 위한 것이 아 니라 설명하기 위한 것이고, 이러한 실시예에 의하여 본 발명의 기술 사상의 범위가 한정되는 것은 아니다. 본 발명의 보호 범위는 아래의 청구범위에 의하여 해석되어야 하며, 그와 동등한 범위 내에 있는 모든 기술 사상은 본 발명의 권리범위에 포함되는 것으로 해석되어야 할 것이다.The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

도 1은 본 발명에 따른 디젤엔진 배기가스 저감 장치를 나타낸 블록도.1 is a block diagram showing a diesel engine exhaust gas reduction apparatus according to the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

100 : 디젤엔진 배기가스 저감장치 102 : 흡장 촉매부(LNT) 100: diesel engine exhaust gas reduction device 102: occlusion catalyst unit (LNT)

104 : 산소압축/분사부 106 : 머플러부 104: oxygen compression / injection unit 106: muffler unit

108 : 산소 감지부 110 : 입자성 물질 필터부 108: oxygen detection unit 110: particulate matter filter unit

Claims (3)

산소 분사 신호에 따라 압축되어 있던 산소를 분사하는 산소압축/분사부;An oxygen compression / injection unit for injecting oxygen compressed according to the oxygen injection signal; LNT 탈황 또는 입자상 물질 필터의 재생시 배기가스의 산소량을 감지하여 상기 산소량이 소정의 기준 산소량 미만인 경우에 상기 산소압축/분사부로 상기 산소 분사 신호를 인가하는 산소 감지부를 포함하는 머플러부; 및A muffler unit including an oxygen detector configured to sense an oxygen amount of the exhaust gas during LNT desulfurization or regeneration of a particulate matter filter and apply the oxygen injection signal to the oxygen compression / injection unit when the oxygen amount is less than a predetermined reference oxygen amount; And 상기 산소 감지부측의 상기 머플러부에 연결되어 상기 배기 가스에서 입자상 물질(PM:Particulate Matters)을 저감시키는 입자성 물질 필터부를 포함하는 디젤엔진 배기가스 저감 장치.And a particulate matter filter unit connected to the muffler unit on the oxygen sensing unit side to reduce particulate matter (PM) in the exhaust gas. 제1항에 있어서,The method of claim 1, 상기 산소압축/분사부측의 상기 머플러부에 연결되어 질소산화물(예컨대, NOx)을 저감시키는 흡장 촉매부를 더 포함하는 디젤엔진 배기가스 저감 장치.A diesel engine exhaust gas reduction device further comprising an occlusion catalyst portion connected to the muffler portion on the oxygen compression / injection portion to reduce nitrogen oxides (eg, NOx). 삭제delete
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Publication number Priority date Publication date Assignee Title
US10865678B2 (en) 2018-03-08 2020-12-15 Ford Global Technologies, Llc Methods and systems for an exhaust gas aftertreatment arrangement

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11200849A (en) 1998-01-08 1999-07-27 Mitsubishi Motors Corp Exhaust emission control device of engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11200849A (en) 1998-01-08 1999-07-27 Mitsubishi Motors Corp Exhaust emission control device of engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10865678B2 (en) 2018-03-08 2020-12-15 Ford Global Technologies, Llc Methods and systems for an exhaust gas aftertreatment arrangement

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