JP2002535531A - Method and apparatus for purifying an exhaust gas flow flowing in an exhaust gas system - Google Patents

Method and apparatus for purifying an exhaust gas flow flowing in an exhaust gas system

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Publication number
JP2002535531A
JP2002535531A JP2000593848A JP2000593848A JP2002535531A JP 2002535531 A JP2002535531 A JP 2002535531A JP 2000593848 A JP2000593848 A JP 2000593848A JP 2000593848 A JP2000593848 A JP 2000593848A JP 2002535531 A JP2002535531 A JP 2002535531A
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Prior art keywords
exhaust gas
honeycomb body
particle filter
coating
residual
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Japanese (ja)
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マウス、ヴォルフガング
ブリュック、ロルフ
Original Assignee
エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング
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Publication of JP2002535531A publication Critical patent/JP2002535531A/en
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Classifications

    • 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
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9495—Controlling the catalytic process
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate 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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0835—Hydrocarbons
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0857—Carbon 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

(57)【要約】 空気／燃料混合気は好ましくはこのオットーエンジン内に直接噴射により供給される。排ガス浄化を改善するために、排ガスを連続して排ガス系統（２）に通す。排ガス流は、少なくとも１つの触媒活性な被覆、好ましくは三元触媒被覆を有する少なくとも１つのハニカム体（３）と、少なくとも１つの有害物質成分、特に炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及び／又は窒素酸化物（ＮＯX）を蓄積する被覆を持つ粒子濾過器（４）とを、少なくとも一時的に順次貫流する。粒子濾過器は、本来の煤粒子を集める役目の他に、コールドスタート時、特に残留炭化水素並びに一酸化炭素を補助的に酸化し、かつオットーエンジン（１）の運転中、特に残留窒素酸化物を補助的に還元する役目をも果たす。 The air / fuel mixture is preferably supplied by direct injection into the Otto engine. To improve the exhaust gas purification, the exhaust gas is continuously passed through an exhaust gas system (2). The exhaust gas stream comprises at least one honeycomb body (3) having at least one catalytically active coating, preferably a three-way catalytic coating, and at least one pollutant component, in particular hydrocarbons (HC), carbon monoxide (CO). And / or a particulate filter (4) with a coating that accumulates nitrogen oxides (NO x ) at least temporarily. In addition to the function of collecting the original soot particles, the particle filter additionally oxidizes residual hydrocarbons and carbon monoxide, especially during cold start, and during operation of the Otto engine (1), It also plays the role of auxiliary reduction.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】 本発明は、空気／燃料混合気が、特に直接噴射により供給される、オットーエ
ンジンの排ガス系統内を流れる排ガス流の浄化方法及び装置に関する。The present invention relates to a method and a device for purifying an exhaust gas stream flowing in an exhaust gas system of an Otto engine, in which an air / fuel mixture is supplied, in particular by direct injection.

【０００２】 例えばガソリン中の炭化水素がオットーエンジン中で空気により燃焼される際
に、一次燃焼生成物である二酸化炭素及び水蒸気の他に、副産物、特に有害物質
の主に炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及び窒素酸化物（ＮＯX）並びに
場合により煤粒子も形成される。排ガス中の有害物質及び煤粒子の含有量は、主
に供給される混合気の空燃比に依存する。空燃比が低い場合を“リッチな”混合
組成（空気不足）と、また空燃比が高い場合を“リーンな”混合組成（空気過剰
）と言う表現を用いる。For example, when hydrocarbons in gasoline are burned by air in an Otto engine, besides the primary combustion products carbon dioxide and water vapor, by-products, especially harmful substances, mainly hydrocarbons (HC), Carbon monoxide (CO) and nitrogen oxides (NO x ) and possibly soot particles are also formed. The contents of harmful substances and soot particles in the exhaust gas mainly depend on the air-fuel ratio of the supplied air-fuel mixture. When the air-fuel ratio is low, the expression "rich" mixture composition (insufficient air) is used, and when the air-fuel ratio is high, the expression "lean" mixture composition (excess air) is used.

【０００３】 煤は主として極端な空気不足で燃焼する際に生じる。この状況には、確かに通
常オットーエンジンでは達しないが、しかし局部的不均質により、特にコールド
スタート時に生じる場合がある。煤の形成は、通常燃料分子の酸素不足での熱分
解（クラッキング）により開始され、水素の分解下に、炭素分の多い巨大分子の
重合を来し、最終的に煤分子に凝集する。化学量論的な空気比に近づいた際の煤
の著しい増大は、噴射量の増加によりリッチな混合気帯域が拡大することに基因
すると思われる。リッチな混合帯域中に形成された煤は、他の措置を講じなけれ
ば大抵は殆ど燃焼することはない。[0003] Soot is mainly generated when burning in extreme shortage of air. This situation is certainly not normally achieved with Otto engines, but local inhomogeneities can occur, especially during cold starts. The formation of soot is usually initiated by the cracking of the fuel molecules under oxygen deficiency, resulting in the polymerization of macromolecules rich in carbon, under the decomposition of hydrogen, which eventually aggregates into soot molecules. The significant increase in soot as it approaches the stoichiometric air ratio may be due to an increase in the rich air-fuel mixture zone due to the increased injection volume. The soot formed in the rich mixing zone will almost never burn unless other measures are taken.

【０００４】 未燃焼の煤粒子は環境に負荷を与えないので、例えばドイツ特許出願公開第４
１１７６７６号明細書から、特にディーゼル機関の排ガス系統内に、煤粒子の堆
積を促進する構造を持った、少なくとも１つの濾過器を配置することが公知であ
る。このような粒子濾過器の再生、即ち堆積した煤粒子の燃焼は、粒子濾過器の
加熱のため例えば一時的な燃料と空気の供給により行われ、その結果空気不足の
状態で生成された煤粒子も再び燃焼する。また例えばドイツ特許出願公開第４０
１２７１９号明細書からも、少なくとも１つの有害物質成分、特に炭化水素（Ｈ
Ｃ）、一酸化炭素（ＣＯ）及び／又は窒素酸化物（ＮＯX）を変換させる触媒を
有する濾過器を設けることが公知である。[0004] Unburned soot particles do not place a burden on the environment and are, for example, published in German Patent Application No. 4
It is known from EP 117676 to arrange at least one filter with a structure that promotes the accumulation of soot particles, in particular in the exhaust gas system of a diesel engine. The regeneration of such a particle filter, i.e. the combustion of the deposited soot particles, is carried out, for example, by a temporary supply of fuel and air to heat the particle filter, so that the soot particles produced in a state of air shortage Also burn again. For example, German Patent Application Publication No. 40
No. 12719 also shows that at least one hazardous substance component, in particular a hydrocarbon (H
C), it is known to provide a filter having a catalyst for converting carbon monoxide (CO) and / or nitrogen oxides (NO X).

【０００５】 更に極端な空気不足状態で燃焼した場合、排ガスは比較的多量のＣＯ及びＨＣ
を含み、一方ある程度までの空気過剰状態の場合、ＣＯ及びＨＣはほぼ完全に酸
化可能である。ＮＯXの含有量は若干リーンな混合気組成の範囲で最大になる。
しかしこの範囲にオットーエンジンの燃料消費率の最適値がある。従ってオット
ーエンジンを最適に低い燃料消費量に調整しようとすると、適量のＣＯ及びＨＣ
濃度の他に、高いＮＯX濃度が排ガス中に生じる。その際勿論大抵は小形で 、ま
たディーゼル機関の場合よりも全体量として少量ではあるが、オットーエンジン
もこのような粒子を形成するという事実にこれまで殆ど注意が払われていなかっ
た。とはいえ、このような粒子も環境を汚染し得るものである。[0005] Further, when the fuel is burned in an extreme shortage of air, the exhaust gas contains relatively large amounts of CO and HC.
, While in the case of some excess air, CO and HC are almost completely oxidizable. The content of the NO X becomes maximum in a range of slightly lean mixture composition.
However, there is an optimum value for the fuel consumption of the Otto engine in this range. Therefore, in order to optimize the Otto engine for low fuel consumption, an appropriate amount of CO and HC is required.
In addition to the concentration, high NO X concentration occurs in the exhaust gas. Heretofore little attention has been paid to the fact that Otto engines also form such particles, albeit usually of small size, and in smaller amounts than in diesel engines. However, such particles can also pollute the environment.

【０００６】 本発明の課題は、オットーエンジンの排ガス系統内を流れる排ガス流を、一層
良好に浄化する方法及び装置を提供することにある。An object of the present invention is to provide a method and an apparatus for purifying an exhaust gas flow flowing in an exhaust gas system of an Otto engine more effectively.

【０００７】 この課題は、請求項１に記載の方法並びに請求項１２に記載の装置により解決
される。有利な実施形態及び態様についてはそれぞれ従属請求項に記載する。This object is achieved by a method according to claim 1 and a device according to claim 12. Advantageous embodiments and aspects are described in the respective dependent claims.

【０００８】 空気／燃料混合気を主として直接噴射により供給する、オットーエンジンの排
ガス系統内を流れる排ガス流を浄化する本発明方法は、排ガス系統内の排ガスが
触媒活性な被覆、好ましくは三元触媒被覆を有する少なくとも１つのハニカム体
と、少なくとも一時的に、少なくとも１つの有害物質成分、特に炭化水素（ＨＣ
）、一酸化炭素（ＣＯ）及び／又は窒素酸化物（ＮＯX）を蓄積する被覆を有す
る粒子濾過器とを順次貫流し、それにより好ましくは排ガス浄化の改善を達成で
きる点で優れている。The method according to the invention for purifying an exhaust gas stream flowing in an exhaust gas system of an Otto engine, in which the air / fuel mixture is supplied mainly by direct injection, comprises a catalytically active coating, preferably a three-way catalyst, in the exhaust gas in the exhaust gas system. At least one honeycomb body having a coating and at least temporarily at least one hazardous substance component, in particular a hydrocarbon (HC
), And a particulate filter having a coating that accumulates carbon monoxide (CO) and / or nitrogen oxides (NO x ) in sequence, thereby advantageously achieving improved exhaust gas purification.

【０００９】 即ち、少なくとも一時的に有害物質成分の少なくとも１つを蓄積する被覆を有
する粒子濾過器を、触媒活性な被覆を有する少なくとも１つのハニカム体の後方
に配置した場合、排ガス系統内を流れる排ガスの浄化を、有害物質成分について
も、また場合によっては煤粒子の発生についても驚異的に改善できる。In other words, when a particle filter having a coating that at least temporarily stores at least one of the harmful substance components is disposed behind at least one honeycomb body having a catalytically active coating, it flows in the exhaust gas system. The purification of the exhaust gas can be surprisingly improved both for harmful constituents and, in some cases, for the generation of soot particles.

【００１０】 従ってオットーエンジンに、例えばコールドスタート時にリッチな空燃比の混
合気を供給する場合、排ガス浄化を一層改善するために、粒子濾過器の被覆によ
りハニカム体中で変換されなかった残留ＨＣもしくはＣＯを蓄積させる。[0010] Therefore, when the Otto engine is supplied with a mixture having a rich air-fuel ratio at the time of a cold start, for example, in order to further improve the exhaust gas purification, the residual HC not converted in the honeycomb body by the coating of the particle filter or Allow CO to accumulate.

【００１１】 オットーエンジンにリーンな空燃比の混合気を供給する場合、排ガス浄化を一
層改善するため、粒子濾過器の被覆によりハニカム体中で変換されなかった残留
ＮＯXを蓄積させる。When a lean air-fuel mixture is supplied to an Otto engine, in order to further improve exhaust gas purification, residual NO X that has not been converted in the honeycomb body by the coating of the particle filter is accumulated.

【００１２】 こうして排ガス中でしばしば有害物質濃度が高まるときも、適切にかつ完全に
解消することができる。[0012] Thus, even when the concentration of harmful substances in the exhaust gas often increases, it can be properly and completely eliminated.

【００１３】 更に窒素酸化物（ＮＯX）を低減するには、ハニカム体の後方の排ガス中残留
ＮＯX濃度に応じて、粒子濾過器に還元剤を、好ましくは還元剤タンクから少な
くとも１つの還元剤導管を介して、例えば連続的に供給することを提案する。In order to further reduce nitrogen oxides (NO x ), residual gas in exhaust gas behind the honeycomb body
Depending to the NO X concentration, the reducing agent to the particle filter, preferably less from the reducing agent tank
It is proposed to feed, for example, continuously, via at least one reducing agent conduit.

【００１４】 或いはまた、還元剤を間欠的に粒子濾過器に供給すること、特に粒子濾過器内
に蓄積された残留ＮＯXの分量に応じて供給することを提案する。[0014] Alternatively, it is proposed to supply the reducing agent to the particle filter intermittently, in particular to supply it according to the amount of residual NO X accumulated in the particle filter.

【００１５】 ハニカム体の後方における排ガス中の残留ＮＯX濃度に応じ、還元剤、例えば
アンモニアを供給すると、還元剤の過量投入をほぼ完全に回避し、それにより残
留ＮＯXと還元剤との間にほぼ化学量論比を達成し、ＮＯXを含有するオットーエ
ンジンからの排ガスの浄化は好ましく改善できる。もう１つの利点は、例えば還
元剤を触媒活性な被覆を有するハニカム体を貫流する前の排ガス中に噴射すれば
、還元剤の分量が明らかに少なくて済む点にある。[0015] Depending on the residual concentration of NO X in the exhaust gas in the rear of the honeycomb body, a reducing agent, e.g.
Supplying ammonia, to avoid excess introduction of the reducing agent almost completely, thereby achieving a substantially stoichiometric ratio between the residual NO X reducing agent, purification of exhaust gases from Otto engines containing NO X Can be preferably improved. Another advantage is that, for example, if the reducing agent is injected into the exhaust gas before flowing through the honeycomb body having the catalytically active coating, the amount of the reducing agent is significantly reduced.

【００１６】 本発明において、特に還元剤導管を粒子濾過器迄到達させ、粒子濾過器に還元
剤導管に接続している分配装置を組込むと有利である。In the present invention, it is particularly advantageous if the reducing agent conduit reaches the particle filter and the particle filter incorporates a distributor connected to the reducing agent conduit.

【００１７】 炭化水素（ＨＣ）及び一酸化炭素（ＣＯ）を更に低減するため、ハニカム体の
後方にある排ガス中の残留ＨＣ、ＣＯ濃度に応じて、粒子濾過器に酸化剤、好ま
しくは酸素（Ｏ2）を供給することを提案する。To further reduce hydrocarbons (HC) and carbon monoxide (CO), depending on the residual HC and CO concentrations in the exhaust gas behind the honeycomb body, an oxidizing agent, preferably oxygen ( It is proposed to supply O 2 ).

【００１８】 それとは別に及び／又はそれに加えて、粒子濾過器の被覆が少なくとも一時的
に酸素（Ｏ2）を蓄積できると有利である。Alternatively and / or additionally, it is advantageous if the coating of the particle filter can at least temporarily store oxygen (O 2 ).

【００１９】 酸化剤を残留炭化水素（ＨＣ）及び残留一酸化炭素（ＣＯ）に応じて供給する
ことは、ほぼ完全に酸化剤の過量投入を回避し、それにより一方では残留ＨＣも
しくはＣＯと、他方では酸化剤との間にほぼ化学量論比を達成し、かつＨＣもし
くはＣＯを含むオットーエンジンの排ガスの浄化を改善する効果もある。Providing the oxidant as a function of residual hydrocarbons (HC) and residual carbon monoxide (CO) almost completely avoids overdosing of the oxidant, whereby on the one hand residual HC or CO, On the other hand, it has the effect of achieving a nearly stoichiometric ratio with the oxidizing agent and improving the purification of the exhaust gas of the Otto engine containing HC or CO.

【００２０】 一般に最近のオットーエンジンは電子エンジン制御装置又はそれに匹敵する制
御及び調整手段を有する。例えばエンジン制御装置により排ガス浄化の制御及び
／又は調整を改善するには、ハニカム体と粒子濾過器との間に、ハニカム体中で
変換されなかった少なくとも１つの有害物質成分を測定する、少なくとも１つの
センサを配置し、その際好ましくは残留有害物質成分の炭化水素（ＨＣ）、一酸
化炭素（ＣＯ）及び窒素酸化物（ＮＯX）を測定するために、各々少なくとも１
つのセンサを備えることを提案する。こうして有利な方法で、ハニカム体中で変
換されなかった有害物質成分の残分を識別でき、その後方に配置された、適切に
蓄積できる被覆を有する粒子濾過器中で、この濾過器に、例えば電子エンジン制
御装置により制御して配量される還元剤もしくは酸化剤により補助されて、有害
物質成分を変換することができる。In general, modern Otto engines have an electronic engine controller or comparable control and regulation means. In order to improve the control and / or regulation of exhaust gas purification, for example by means of an engine controller, at least one harmful substance component which has not been converted in the honeycomb body is measured between the honeycomb body and the particle filter. One of placing the sensor in order to measure the time preferably residual pollutant component of hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxides (NO X), respectively at least one
It is proposed to provide two sensors. Thus, in an advantageous manner, the residue of the harmful substance components which have not been converted in the honeycomb body can be identified and, in a particle filter arranged behind it and having a suitably accumulable coating, for example, With the aid of a reducing or oxidizing agent controlled and metered by an electronic engine control unit, the harmful substance components can be converted.

【００２１】 本発明では、この粒子濾過器を粒子の燃焼により再生すること、特にエンジン
熱により及び／又はハニカム体内での発熱反応により、例えばエンジンの制御に
より決定可能な間隔をおいて分解させることが可能である。According to the invention, the particle filter is regenerated by burning the particles, in particular by decomposing it at intervals which can be determined by engine heat and / or by exothermic reactions in the honeycomb body, for example by controlling the engine. Is possible.

【００２２】 上記の分離した配置に代えて、このハニカム体の少なくとも一部で同時に粒子
濾過器を構成してもよく、それにより場所を取らない構造が得られる。Instead of the separate arrangement described above, at least a part of the honeycomb body may constitute a particle filter at the same time, thereby obtaining a space-saving structure.

【００２３】 本発明の他の特徴、利点及び実施形態を図示の実施例のより以下に詳述する。Other features, advantages and embodiments of the present invention are described in more detail below with reference to the illustrated examples.

【００２４】 図１は、空気／燃料混合気を特に直接噴射により供給する、オットーエンジン
１の排ガス系統２内を流れる排ガス流を浄化する装置を概略的に示す。排ガス系
統２内に、その流れ方向Ｓに順次触媒活性な被覆、特に三元触媒被覆を有する少
なくとも１つのハニカム体３と、少なくとも一時的に、少なくとも１つの有害物
質成分、特に炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及び／又は窒素酸化物（Ｎ
ＯX）を蓄積する被覆を有する粒子濾過器４とがある。FIG. 1 schematically shows a device for purifying an exhaust gas stream flowing in an exhaust gas system 2 of an Otto engine 1, which supplies an air / fuel mixture, in particular by direct injection. In the exhaust gas system 2, at least one honeycomb body 3 having a catalytically active coating, in particular a three-way catalytic coating, in the direction of flow S, and at least temporarily at least one harmful substance component, in particular hydrocarbons (HC) , Carbon monoxide (CO) and / or nitrogen oxides (N
O X) is a particle filter 4 having a coating that accumulates.

【００２５】 この粒子濾過器４の被覆は、特に少なくとも部分的に、オットーエンジン１に
リッチな空燃比の混合気が供給される場合、ハニカム体３内で変換されなかった
残留ＨＣ及びＣＯを蓄積し、またオットーエンジン１にリーンな空燃比の混合気
が供給される場合、ハニカム体３内で変換されなかった残留ＮＯXを蓄積するよ
うに形成されている。The coating of the particle filter 4 accumulates, at least in part, residual HC and CO that have not been converted in the honeycomb body 3, especially when the Otto engine 1 is supplied with a rich air / fuel mixture. In addition, when the Otto engine 1 is supplied with a mixture having a lean air-fuel ratio, it is configured to accumulate residual NO X that has not been converted in the honeycomb body 3.

【００２６】 残留する有害物質成分である炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及び窒素
酸化物（ＮＯX）を測定するため、ハニカム体３と粒子濾過器４との間に、各々
少なくとも１つずつのセンサ５、６、７が配置されており、好ましくは排ガス浄
化を制御もしくは調整するためのプログラムを内蔵する、図示しない電子制御装
置と接続されている。特にこの制御装置を使って、必要に応じて添加される還元
剤及び／又は酸化剤の分量を決定できる。In order to measure the remaining harmful substance components such as hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxide (NO x ), at least each of the components is disposed between the honeycomb body 3 and the particle filter 4. Each sensor 5, 6, 7 is arranged and is preferably connected to an electronic control unit (not shown) which contains a program for controlling or regulating exhaust gas purification. In particular, the control device can be used to determine the amount of reducing agent and / or oxidizing agent added as needed.

【００２７】 従って例えばハニカム体３の後方の排ガス中で測定した残留ＨＣ、ＣＯ濃度も
しくは残留ＮＯX濃度に応じて、粒子濾過器４に酸化剤を、或いは還元剤タンク
８から少なくとも１つの還元剤導管９を介してポンプ１１により還元剤を供給す
る。粒子濾過器４には、特に還元剤を供給するために、還元剤導管９と接続され
た分配装置１０を組込むと有利である。Therefore, depending on the residual HC, CO concentration or residual NO X concentration measured in the exhaust gas behind the honeycomb body 3, an oxidizing agent or a reducing agent tank is added to the particle filter 4.
From 8 a reducing agent is supplied by a pump 11 via at least one reducing agent conduit 9. Advantageously, the particle filter 4 incorporates a distributor 10 connected to a reducing agent conduit 9, in particular for supplying the reducing agent.

【００２８】 好ましくは液体のアンモニアを還元剤として使用し、これを還元剤タンク８内
に入れておき、必要に応じて供給してもよい。或いは更に還元剤の前駆物質とし
て例えば尿素を還元剤タンク８内に蓄えておき、必要に応じ、特に熱分解により
還元剤を生成し、引続き液体として粒子濾過器４に特に分配装置１０を介して供
給してもよい。Preferably, liquid ammonia is used as the reducing agent, which may be put in the reducing agent tank 8 and supplied as needed. Alternatively, for example, urea is further stored as a precursor of the reducing agent in the reducing agent tank 8, and if necessary, the reducing agent is generated, particularly by thermal decomposition. May be supplied.

【００２９】 煤粒子の蓄積を促進する粒子濾過器４の構造は、孔構造又は溝構造が有利であ
り、溝の場合、これを好ましくは少なくとも部分的にずらして及び／又は交差し
て配置する。粒子濾過器４の再生のため、即ち濾過器内に蓄積された煤粒子の燃
焼のため、粒子濾過器４は、粒子が特にハニカム体３内で発熱反応により、好ま
しくは予め設定した時間間隔で燃焼するように、少なくともハニカム体３の後に
十分密接して配置する。The structure of the particle filter 4 that promotes the accumulation of soot particles is advantageously a hole structure or a groove structure, in the case of grooves which are preferably arranged at least partially offset and / or crosswise. . For the regeneration of the particle filter 4, ie for the combustion of the soot particles stored in the filter, the particle filter 4 is operated by the exothermic reaction, especially in the honeycomb body 3, preferably at predetermined time intervals. It is placed close enough at least after the honeycomb body 3 to burn.

【００３０】 本発明では、ハニカム体３が少なくとも一部分で同時に粒子濾過器４を構成し
ていてもよい。In the present invention, at least a part of the honeycomb body 3 may simultaneously constitute the particle filter 4.

【００３１】 更に、本発明によるハニカム体３と粒子濾過器４の配置に、オットーエンジン
１の排ガス系統２内に別の構成要素を設置してもよい。特にハニカム体３の手前
に、ハニカム体３内での所望の酸化もしくは還元プロセスを僅か１００℃程度の
排ガス温度でも行えるようにするため、ハニカム体３及びその触媒被覆をできる
だけ乾燥させておく、所謂除水器を少なくとも１つ配置してもよい。従ってこの
除水器は一定の温度以下の水を大量に集め、貯蔵できる物質を含んでいる。Furthermore, another component may be installed in the exhaust gas system 2 of the Otto engine 1 in the arrangement of the honeycomb body 3 and the particle filter 4 according to the present invention. In particular, in order to perform a desired oxidation or reduction process in the honeycomb body 3 even before the honeycomb body 3 at an exhaust gas temperature of only about 100 ° C., the honeycomb body 3 and its catalyst coating are dried as much as possible. At least one water remover may be arranged. Thus, the dewaterer contains a substance that can collect and store a large amount of water below a certain temperature.

【００３２】 またハニカム体３の手前の排ガス系統２内にも、エンジンの始動直後でも、有
害物質を接触置換するべく、少なくとも一時的に排ガス温度を高めることを保証
するため、付加的に電気的に加熱可能な触媒を配置してもよい。このハニカム体
３自体を電気的に加熱しても差し支えない。In order to ensure that the temperature of the exhaust gas is increased at least temporarily in order to contact and replace harmful substances even in the exhaust gas system 2 immediately before the honeycomb body 3 even immediately after the start of the engine, an additional electric A heatable catalyst may be arranged at the bottom. The honeycomb body 3 itself may be electrically heated.

【００３３】 本発明は、特にオットーエンジン内の排ガスの浄化に好適である。その際好ま
しくは、粒子濾過器４がその煤粒子を捕獲する役目の他に、コールドスタート時
に、特に残留炭化水素（ＨＣ）並びに一酸化炭素（ＣＯ）を補助的に酸化し、か
つオットーエンジン１の運転中に、特に残留窒素酸化物（ＮＯX）を補助的に 還
元する役目を果たす。The present invention is particularly suitable for purifying exhaust gas in an Otto engine. Preferably, in addition to the function of the particle filter 4 for trapping the soot particles, the cold filter preferably additionally oxidizes residual hydrocarbons (HC) and carbon monoxide (CO), and the Otto engine 1 of during operation, it serves to reduce particularly residual nitrogen oxides (NO X) in an auxiliary manner.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 オットーエンジンの排ガス系統内を流れる排ガス流を浄化する装置を示す図。FIG. 1 is a diagram showing an apparatus for purifying an exhaust gas flow flowing in an exhaust gas system of an Otto engine.

【符号の説明】[Explanation of symbols]

１ オットーエンジン ２ 排ガス系統 ３ ハニカム体 ４ 粒子濾過器 ５、６、７ センサ ８ 還元剤タンク ９ 還元剤導管 １０ 分配装置 １１ ポンプ Ｓ 排ガスの流れ方向 DESCRIPTION OF SYMBOLS 1 Otto engine 2 Exhaust gas system 3 Honeycomb body 4 Particle filter 5, 6, 7 Sensor 8 Reducing agent tank 9 Reducing agent conduit 10 Distributing device 11 Pump S Exhaust gas flow direction

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０１Ｎ 3/02 ３２１ Ｆ０１Ｎ 3/02 ３２１Ｂ 3/18 Ｂ 3/18 3/24 Ｅ 3/24 3/32 Ｄ 3/32 Ｇ０１Ｎ 33/00 Ｃ // Ｇ０１Ｎ 33/00 Ｂ０１Ｄ 53/36 Ａ (81)指定国 ＥＰ(ＡＴ，ＢＥ，ＣＨ，ＣＹ， ＤＥ，ＤＫ，ＥＳ，ＦＩ，ＦＲ，ＧＢ，ＧＲ，ＩＥ，Ｉ Ｔ，ＬＵ，ＭＣ，ＮＬ，ＰＴ，ＳＥ)，ＯＡ(ＢＦ，ＢＪ ，ＣＦ，ＣＧ，ＣＩ，ＣＭ，ＧＡ，ＧＮ，ＧＷ，ＭＬ， ＭＲ，ＮＥ，ＳＮ，ＴＤ，ＴＧ)，ＡＰ(ＧＨ，ＧＭ，Ｋ Ｅ，ＬＳ，ＭＷ，ＳＤ，ＳＬ，ＳＺ，ＴＺ，ＵＧ，ＺＷ )，ＥＡ(ＡＭ，ＡＺ，ＢＹ，ＫＧ，ＫＺ，ＭＤ，ＲＵ， ＴＪ，ＴＭ)，ＡＥ，ＡＬ，ＡＭ，ＡＴ，ＡＵ，ＡＺ， ＢＡ，ＢＢ，ＢＧ，ＢＲ，ＢＹ，ＣＡ，ＣＨ，ＣＮ，Ｃ Ｒ，ＣＵ，ＣＺ，ＤＥ，ＤＫ，ＤＭ，ＥＥ，ＥＳ，ＦＩ ，ＧＢ，ＧＤ，ＧＥ，ＧＨ，ＧＭ，ＨＲ，ＨＵ，ＩＤ， ＩＬ，ＩＮ，ＩＳ，ＪＰ，ＫＥ，ＫＧ，ＫＰ，ＫＲ，Ｋ Ｚ，ＬＣ，ＬＫ，ＬＲ，ＬＳ，ＬＴ，ＬＵ，ＬＶ，ＭＡ ，ＭＤ，ＭＧ，ＭＫ，ＭＮ，ＭＷ，ＭＸ，ＮＯ，ＮＺ， ＰＬ，ＰＴ，ＲＯ，ＲＵ，ＳＤ，ＳＥ，ＳＧ，ＳＩ，Ｓ Ｋ，ＳＬ，ＴＪ，ＴＭ，ＴＲ，ＴＴ，ＴＺ，ＵＡ，ＵＧ ，ＵＳ，ＵＺ，ＶＮ，ＹＵ，ＺＡ，ＺＷ (72)発明者 ブリュック、ロルフ ドイツ連邦共和国 デー‐51429 ベルギ ッシュ グラートバッハ フレーベルシュ トラーセ 12 Ｆターム(参考） 3G090 AA03 BA01 BA02 BA04 CA01 CB05 CB07 CB11 DA10 DB01 DB02 EA02 3G091 AA12 AA17 AA24 AA28 AB02 AB03 AB09 AB10 AB13 BA00 BA03 BA14 BA15 BA19 CA04 CA17 CA24 CB02 CB03 DA01 DA02 DB10 EA33 EA34 FA02 FA04 FB02 FB10 FB12 FC07 GA06 HA15 HA21 HA36 HA37 HA45 HB07 4D048 AA06 AA13 AA14 AA18 AB01 AB02 AC04 BB02 CC32 CD05 DA02 DA08 EA04 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) F01N 3/02 321 F01N 3/02 321B 3/18 B 3/18 3/24 E 3/24 3/32 D3 / 32 G01N 33/00 C // G01N 33/00 B01D 53/36 A (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE , IT, LU, MC, NL, PT, SE), OA (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG), AP ( GH, GM, KE, LS, MW, SD, SL, SZ, TZ, UG, ZW), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AE, AL, AM , AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CR, CU, CZ, DE, DK, DM, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU , ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW (72) Inventor Bruch, Rolf DE-51429 Bergisch Gladbach Fleberstrasse 12 F term (reference) 3G090 AA03 BA01 BA02 BA04 CA01 CB05 CB07 CB11 DA10 DB01 DB02 EA02 3G091 AA12 AA17 AA24 AA10 AB02 AB03 AB09 BA00 BA03 BA14 BA15 BA19 CA04 CA17 CA24 CB02 CB03 DA01 DA02 DB10 EA33 EA34 FA02 FA04 FB02 FB10 FB12 FC07 GA06 HA15 HA21 HA36 HA37 HA45 HB07 4D048 AA06 AA13 AA14 AA18 AB01 AB02 AC04 BB02 CC32 CD05 DA02 DA08 EA04

Claims (23)

【特許請求の範囲】[Claims] 【請求項１】 特に直接噴射により空気／燃料混合気を供給される、オット
ーエンジン（１）の排ガス系統（２）内を流れる排ガス流の浄化方法において、
排ガス系統（２）内の排ガスを、少なくとも１つの触媒活性な被覆、好ましくは
三元触媒被覆を有するハニカム体（３）と、少なくとも一時的に、少なくとも１
つの有害成分、特に炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及び／又は窒素酸化
物（ＮＯX）を蓄積する被覆を有する粒子濾過器（４）とを順次貫流させること
を特徴とする方法。1. A method for purifying an exhaust gas stream flowing in an exhaust gas system (2) of an Otto engine (1), in particular supplied with an air / fuel mixture by direct injection.
The exhaust gas in the exhaust gas system (2) is combined with a honeycomb body (3) having at least one catalytically active coating, preferably a three-way catalytic coating, at least temporarily for at least one time.
One of the harmful components, wherein the to sequentially flow through the particle filter (4), particularly hydrocarbons (HC), having a coating of accumulating carbon monoxide (CO) and / or nitrogen oxides (NO X) . 【請求項２】 オットーエンジン（１）にリッチな空燃比の混合気を供給す
る際、粒子濾過器（４）の被覆によりハニカム体（３）内で変換されなった残留
ＨＣ及びＣＯを蓄積することを特徴とする請求項１記載の方法。2. When supplying an air-fuel mixture having a rich air-fuel ratio to the Otto engine (1), residual HC and CO not converted in the honeycomb body (3) by the coating of the particle filter (4) are accumulated. The method of claim 1, wherein: 【請求項３】 オットーエンジン（１）にリーンな空燃比の混合気を供給す
る際、粒子濾過器（４）の被覆によりハニカム体（３）内で変換されなかった残
留ＮＯXを蓄積することを特徴とする請求項１記載の方法。3. When the mixture of lean air-fuel ratio is supplied to the Otto engine (1), the residual NO X not converted in the honeycomb body (3) by the coating of the particle filter (4) is accumulated. The method of claim 1, wherein: 【請求項４】 ハニカム体（３）後方の排ガス中の残留ＮＯX濃度に応じ、
粒子濾過器（４）に還元剤、例えばアンモニアを供給することを特徴とする請求
項１乃至３の１つに記載の方法。4. According to the residual NO X concentration in the exhaust gas behind the honeycomb body (3),
4. The method as claimed in claim 1, wherein a reducing agent, for example ammonia, is supplied to the particle filter. 【請求項５】 還元剤を連続的に供給することを特徴とする請求項４記載の
方法。5. The method according to claim 4, wherein the reducing agent is supplied continuously. 【請求項６】 還元剤を、特に粒子濾過器（４）内に蓄積された残留ＮＯX
の分量に応じ、間欠的に供給することを特徴とする請求項４記載の方法。6. Reducing agent, in particular residual NO X accumulated in the particle filter (4)
5. The method according to claim 4, wherein the supply is performed intermittently according to the amount of the liquid. 【請求項７】 ハニカム体（３）の後方の残留ＨＣ、ＣＯ濃度に応じ、粒子
濾過器（４）に酸化剤、特に酸素（Ｏ2）を供給することを特徴とする請求項１
乃至３の１つに記載の方法。7. An oxidizing agent, in particular oxygen (O 2 ), is supplied to the particle filter (4) according to the concentration of HC and CO remaining behind the honeycomb body (3).
4. The method according to one of claims 1 to 3. 【請求項８】 粒子濾過器（４）の被覆が少なくとも一時的に酸素（Ｏ2）
を蓄積することを特徴とする請求項１乃至７の１つに記載の方法。8. The coating of the particle filter (4) at least temporarily with oxygen (O 2 )
The method according to one of claims 1 to 7, characterized in that: 【請求項９】 ハニカム体（３）と粒子濾過器（４）との間に、ハニカム体
（３）中で変換されなかった少なくとも１つの残留有害物質成分を測定する、少
なくとも１つのセンサを配置することを特徴とする請求項１乃至８の１つに記載
の方法。9. At least one sensor is arranged between the honeycomb body (3) and the particle filter (4) for measuring at least one residual harmful substance component not converted in the honeycomb body (3). The method according to one of claims 1 to 8, comprising: 【請求項１０】 残留有害物質成分の炭化水素（ＨＣ）、一酸化炭素（ＣＯ
）及び窒素酸化物（ＮＯX）を測定するため、各々少なくとも１つのセンサ（５
、６、７）を設けることを特徴とする請求項９記載の方法。10. Hydrocarbon (HC) and carbon monoxide (CO) as residual harmful substance components.
) And nitrogen oxides (NO x ) at least one sensor (5
, 6, 7). 【請求項１１】 粒子濾過器（４）を粒子の燃焼により再生すること、特に
エンジン熱及び／又はハニカム体（３）内での発熱反応により、好ましくは一定
の間隔で再生させることを特徴とする請求項１乃至１０の１つに記載の方法。11. Regeneration of the particle filter (4) by combustion of particles, in particular by engine heat and / or exothermic reaction in the honeycomb body (3), preferably at regular intervals. The method according to one of the preceding claims. 【請求項１２】 特に直接噴射により空気／燃料混合気を供給する、オット
ーエンジン（１）の排ガス系統（２）内を流れる排ガス流の浄化装置において、
排ガス系統（２）内に、触媒活性な被覆、好ましくは三元触媒被覆を有する少な
くとも１つのハニカム体（３）と、少なくとも一時的に、少なくとも１つの有害
成分、特に炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及び／又は窒素酸化物（ＮＯ X ）を蓄積する被覆を有する粒子濾過器（４）とが、排ガス流の流れ方向に順次
配置されたことを特徴とする装置。12. Otto, in particular for supplying an air / fuel mixture by direct injection
-In a device for purifying exhaust gas flowing in an exhaust gas system (2) of an engine (1),
A small number of catalytically active coatings, preferably three-way catalytic coatings, in the exhaust gas system (2)
At least one honeycomb body (3) and at least temporarily, at least one harmful
Components, especially hydrocarbons (HC), carbon monoxide (CO) and / or nitrogen oxides (NO X ) Having a coating that accumulates) in the direction of flow of the exhaust gas stream
An apparatus characterized by being arranged. 【請求項１３】 オットーエンジン（１）にリッチな空燃比の混合気を供給
する場合、ハニカム体（３）中で変換されなかった炭化水素（ＨＣ）及び一酸化
炭素（ＣＯ）を、粒子濾過器（４）の被覆により蓄積することを特徴とする請求
項１２記載の装置。13. When a mixture having a rich air-fuel ratio is supplied to the Otto engine (1), hydrocarbon (HC) and carbon monoxide (CO) not converted in the honeycomb body (3) are subjected to particle filtration. 13. Apparatus according to claim 12, wherein the accumulation is provided by coating of the vessel (4). 【請求項１４】 オットーエンジン（１）にリーンな空燃比の混合気を供給
する場合、ハニカム体（３）中で変換されなかった窒素酸化物（ＮＯX）を粒子
濾過器（４）の被覆により蓄積することを特徴とする請求項１２記載の装置。14. When a lean air-fuel mixture is supplied to the Otto engine (1), nitrogen oxides (NO x ) not converted in the honeycomb body (3) are converted into particles.
13. The device according to claim 12, wherein the accumulation is provided by a coating on the filter (4). 【請求項１５】 ハニカム体（３）後方の排ガス中の残留ＮＯＸ濃度に応じ て、粒子濾過器（４）に還元剤タンク（８）から少なくとも１つの還元剤導管 （９）を介して還元剤、例えばアンモニアを供給することを特徴とする請求項
１２乃至１４の１つに記載の装置。15. Depending on the residual NOX concentration in the exhaust gas behind the honeycomb body (3), the reducing agent is passed from the reducing agent tank (8) to the particle filter (4) via at least one reducing agent conduit (9). Device according to one of the claims 12 to 14, characterized in that, for example, ammonia is supplied. 【請求項１６】 還元剤導管（９）が粒子濾過器（４）に達していることを
特徴とする請求項１５記載の装置。16. Device according to claim 15, wherein the reducing agent conduit (9) leads to a particle filter (4). 【請求項１７】 粒子濾過器（４）に、還元剤導管（９）と接続した分配装
置（１０）が組込まれていることを特徴とする請求項１６記載の装置。17. Device according to claim 16, wherein the particle filter (4) incorporates a distributor (10) connected to the reducing agent conduit (9). 【請求項１８】 ハニカム体（３）後方の排ガス中の残留ＨＣ、ＣＯ濃度に
応じて、粒子濾過器（４）に酸化剤、例えば酸素（Ｏ2）を供給可能であること
を特徴とする請求項１２乃至１７の１つに記載の装置。18. An oxidizing agent, for example, oxygen (O 2 ) can be supplied to the particle filter (4) in accordance with the concentration of residual HC and CO in the exhaust gas behind the honeycomb body (3).
Apparatus according to one of claims 12 to 17, characterized in that: 【請求項１９】 粒子濾過器（４）の被覆が、少なくとも一時的に酸素（Ｏ 2 ）を蓄積するように形成されていることを特徴とする請求項１２乃至１８の１
つに記載の装置。19. The coating of the particle filter (4) comprises at least temporarily oxygen (O 2). Two ) Is formed so as to accumulate (1).
An apparatus according to any one of the preceding claims. 【請求項２０】 ハニカム体（３）中で変換されなかった残留有害成分の少
なくとも１つを測定するため、ハニカム体（３）と粒子濾過器（４）との間に少
なくとも１つのセンサが配置されていることを特徴とする請求項１２乃至１９の
１つに記載の装置。20. At least one sensor is arranged between the honeycomb body (3) and the particle filter (4) for measuring at least one residual harmful component not converted in the honeycomb body (3). Apparatus according to one of claims 12 to 19, characterized in that it is: 【請求項２１】 残留有害成分の炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及
び窒素酸化物（ＮＯX）を測定するために、各々少なくとも１つのセンサ（ ５、
６、７）を備えることを特徴とする請求項２０記載の装置。21. Each of at least one sensor (5, 5) for measuring the residual harmful components hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxide (NO x ).
21. The device according to claim 20, comprising (6, 7). 【請求項２２】 粒子濾過器（４）が、エンジン熱及び／又はハニカム体（
３）中の発熱反応により、好ましくは予め設定された間隔で再生されることを特
徴とする請求項１２乃至２１の１つに記載の装置。22. The particle filter (4) is provided with an engine heat and / or a honeycomb body (4).
Device according to one of the claims 12 to 21, characterized in that the device is regenerated, preferably at preset intervals, by the exothermic reaction in 3). 【請求項２３】 ハニカム体（３）の少なくとも一部範囲が、粒子濾過器（
４）をも構成することを特徴とする請求項１２乃至２２の１つに記載の装置。23. At least a part of the honeycomb body (3) has a particle filter (
Device according to one of the claims 12 to 22, characterized in that the device also comprises (4).
JP2000593848A 1999-01-18 2000-01-05 Method and apparatus for purifying an exhaust gas flow flowing in an exhaust gas system Pending JP2002535531A (en)

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DE19901760A DE19901760A1 (en) 1999-01-18 1999-01-18 Method and arrangement for cleaning an exhaust gas stream of a gasoline engine flowing in an exhaust line
DE19901760.3 1999-01-18
PCT/EP2000/000047 WO2000042302A1 (en) 1999-01-18 2000-01-05 Method and arrangement for purifying an exhaust gas stream of a spark ignition engine flowing in an exhaust gas line

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