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DE19904314A1 - Exhaust gas purifying device has a catalyst arrangement consisting of a main catalyst and several pre-catalysts arranged relatively near to the cylinder head - Google Patents

Exhaust gas purifying device has a catalyst arrangement consisting of a main catalyst and several pre-catalysts arranged relatively near to the cylinder head

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Publication number
DE19904314A1
DE19904314A1 DE19904314A DE19904314A DE19904314A1 DE 19904314 A1 DE19904314 A1 DE 19904314A1 DE 19904314 A DE19904314 A DE 19904314A DE 19904314 A DE19904314 A DE 19904314A DE 19904314 A1 DE19904314 A1 DE 19904314A1
Authority
DE
Germany
Prior art keywords
catalyst
exhaust system
cylinder head
exhaust
arranged relatively
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE19904314A
Other languages
German (de)
Inventor
Stephan Mueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Priority to DE19904314A priority Critical patent/DE19904314A1/en
Publication of DE19904314A1 publication Critical patent/DE19904314A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features having two or more purifying devices arranged in parallel
    • 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
    • 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
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/107—More than one exhaust manifold or exhaust collector
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Diese Abgasanlage ist für eine Brennkraftmaschine der Hubkolbenbauart bestimmt, die vorzugsweise mehrere Zylinder und einen Zylinderkopf umfaßt, in dem zur Steuerung von Gasströmen Einlaßventile und Auslaßventile vorgesehen sind. DOLLAR A Um eine optimierte NOx-Umwandlung zu erzielen, weist die Katalysatoreinrichtung einen Hauptkatalysator und mehrere Vorkatalysatoren auf, die relativ nahe am Zylinderkopf angeordnet sind, wobei jeder Vorkatalysator mit einer Dreiwege-Beschichtung mit geringstmöglicher Speicherfähigkeit versehen ist.This exhaust system is intended for an internal combustion engine of the reciprocating piston type, which preferably comprises a plurality of cylinders and a cylinder head, in which inlet valves and outlet valves are provided for controlling gas flows. DOLLAR A In order to achieve an optimized NOx conversion, the catalytic converter device has a main catalytic converter and several pre-catalytic converters which are arranged relatively close to the cylinder head, each pre-catalytic converter being provided with a three-way coating with the least possible storage capacity.

Description

Die Erfindung bezieht sich auf eine Abgasanlage mit Katalysatoreinrichtung für eine Brennkraftmaschine nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an exhaust system with a catalyst device for a Internal combustion engine according to the preamble of patent claim 1.

Aus der DD 133 058 geht eine Abgasanlage einer Brennkraftmaschine hervor, in der zwei hintereinanderliegende Katalysatoren angeordnet sind. Beide Katalysatoren sind entfernt von der Brennkraftmaschine in den Leitungsstrang der Brennkraftmaschine geschaltet.An exhaust system of an internal combustion engine emerges from DD 133 058, in which two catalysts in series are arranged. Both catalysts are removed from the internal combustion engine in the wiring harness of the internal combustion engine switched.

In der DE 195 29 835 Al sind ein Dreiwege-Oxydationskatalysator und ein mit selektiver katalytischer Reduktion arbeitender Katalysator - SCR-Katalysator - in zwei parallel verlaufenden Rohrleitungen untergebracht. Auch diese Katalysatoren sind mit Abstand zur Brennkraftmaschine angeordnet.DE 195 29 835 A1 describes a three-way oxidation catalyst and a selective catalytic reduction catalyst - SCR catalyst - in two parallel pipelines housed. These catalysts are also included Distance to the engine arranged.

Aufgabe der Erfindung ist es, eine Katalysatoreinrichtung in einer Abgasanlage einer Brennkraftmaschine so zu gestalten, daß die Abgasnachbehandlung, insbesondere bezüglich den NOx-Anteilen optimiert wird.The object of the invention is a catalyst device in an exhaust system To design the internal combustion engine so that the exhaust gas aftertreatment, in particular is optimized with regard to the NOx proportions.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Patentanspruchs 1 gelöst. Weitere, die Erfindung ausgestaltenden Merkmale sind in den Unteransprüchen enthalten.According to the invention, this object is achieved by the features of patent claim 1 solved. Further features embodying the invention are in the subclaims contain.

Die mit der Erfindung hauptsächlich erzielten Vorteile sind darin zu sehen, daß durch die Ausgestaltung und Anordnung der Vorkatalysatoren eine Durchmischung des Abgases verhindert wird, d. h. das Abgas durchströmt je Verbrennungszyklus mehr oder weniger geschichtet bzw. inhomogen die Vorkatalysatoren. Dadurch wird für den fett verbrannten Anteil - eines jeden Verbrennungszyklusses - mit hohem NOx-Anteil eine ausgeprägte NOx-Umwandlung erzielt, was sich gerade bei Brennkraftmaschinen mit Direkteinspritzung auf eine vorteilhafte Abgasnachbehandlung auswirkt. Der den Vorkatalysator nachgeschaltete Hauptkatalysator kann im durchmischten und dann weitgehend homogen-mageren Abgas HC und CO umwandeln. Darüber hinaus sind die Vorkatalysatoren derart ausgelegte Bauteile, daß sie sich in die Abgasanlage auf sinnfällige Art und Weise integrieren lassen.The main advantages achieved with the invention are that the design and arrangement of the pre-catalysts a thorough mixing of the Exhaust gas is prevented, d. H. the exhaust gas flows through more per combustion cycle or less stratified or inhomogeneous the pre-catalysts. This is for the portion burned in fat - of each combustion cycle - with a high proportion of NOx  achieves a pronounced NOx conversion, which is particularly the case with internal combustion engines with direct injection affects an advantageous exhaust aftertreatment. The the Pre-catalyst downstream main catalyst can be mixed and then convert largely homogeneous, lean exhaust gas HC and CO. In addition, the Pre-catalytic converters designed components that they are in the exhaust system have a meaningful way integrated.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung gezeigt, das nachstehend näher beschrieben ist.In the drawing, an embodiment of the invention is shown, the following is described in more detail.

Es zeigenShow it

Fig. 1 eine schematische Ansicht von oben auf eine Abgasanlage einer Brennkraftmaschine, Fig. 1 is a schematic top view of an exhaust system of an internal combustion engine,

Fig. 2 einen Teilquerschnitt einer Brennkraftmaschine im Bereich eines Zylinderkopfs, Fig. 2 is a partial cross-section of an internal combustion engine in the region of a cylinder head,

Fig. 3 ein Diagramm, mit dem die Wirkungsweise der Erfindung erläutert wird. Eine Abgasanlage 1 dient zur Führung von verbranntem Kraftstoffmedium einer Brennkraftmaschine 2 - Hubkolbenbauart -, die gegenüberliegende Zylinderreihen 3, 4 - Boxerbauweise - mit Zylindern 5, 6, 7 und 8, 9, 10 aufweist. Die Zylinderreihen 3, 4 sind mit Zylinderköpfen 11, 12 versehen, in denen zur Steuerung von Gasströmen Einlaßventile 14 und Auslaßventile 15 angeordnet sind. Fig. 3 is a diagram with which the operation of the invention is explained. An exhaust system 1 serves to guide the burned fuel medium of an internal combustion engine 2 - reciprocating piston type - which has opposite rows of cylinders 3 , 4 - boxer type - with cylinders 5 , 6 , 7 and 8 , 9 , 10 . The cylinder banks 3 , 4 are provided with cylinder heads 11 , 12 , in which inlet valves 14 and outlet valves 15 are arranged for controlling gas flows.

Die Abgasanlage 1 besitzt eine Katalysatoreinrichtung 16, die gemäß Fig. 1 einen Hauptkatalysator 17 und mehrere Vorkatalysatoren 18, 19, 20 und 21, 22, 23 umfaßt; letztere sind relativ nahe an den Zylinderköpfen 3, 4 angeordnet, d. h. mit geringem Abstand zu den Auslaßkanälen 24 bzw. den Auslaßventilen 15. Jeder Vorkatalysator, z. B. 19, ist mit einer Dreiwege-Beschichtung mit geringstmöglicher Speicherfähigkeit versehen. Außerdem ist jeder Vorkatalysator 19 in die Abgasanlage 1 integriert, wobei er einerseits mit einem an den Zylinderkopf 11 angeschlossenen Flansch 25 und andererseits mit einem Rohrstück 26 der besagten Abgasanlage durch Schweißen verbunden ist.The exhaust system 1 has a catalytic converter 16 which, according to FIG. 1, comprises a main catalytic converter 17 and several precatalysts 18 , 19 , 20 and 21 , 22 , 23 ; the latter are arranged relatively close to the cylinder heads 3 , 4 , ie at a short distance from the exhaust ports 24 and the exhaust valves 15 . Each pre-catalyst, e.g. B. 19 , is provided with a three-way coating with the lowest possible storage capacity. In addition, each pre-catalytic converter 19 is integrated in the exhaust system 1 , being connected on the one hand to a flange 25 connected to the cylinder head 11 and on the other hand to a pipe section 26 of the said exhaust system by welding.

Der Vorkatalysator 19 weist einen kreisförmigen Querschnitt, dergestalt, daß sein Außendurchmesser Am sowie seine Gesamtlänge Gl in etwa gleich groß sind.The precatalyst 19 has a circular cross section such that its outer diameter Am and its total length Gl are approximately the same size.

In dem Diagramm nach Fig. 3 ist auf der Abszisse 27 der Kurbelwellenwinkel KW aufgetragen; auf der Ordinate 28 die Luftzahl Lambda. Eine Kurve 29 gibt in etwa den Verlauf der Luftzahl in Abhängigkeit des Kurbelwellenwinkels wieder und eine horizontale Linie 30 zeigt λ1. Ein Bereich 31 wird durch zwei senkrechte Linien 32, 33 begrenzt, die durch Schnittpunkte Sp1 und Sp2 lagemäßig bestimmt sind. Im Bereich 31 erfolgt eine ausgeprägte NOx-Umwandlung des unvermischten geschichteten Abgases mittels der Vorkatalysatoren 18, 19, 20 und 21, 22, 23. . In the diagram of Figure 3 KW is plotted on the abscissa 27 of the crankshaft angle; the ordinate 28 shows the air ratio lambda. A curve 29 roughly represents the course of the air ratio as a function of the crankshaft angle and a horizontal line 30 shows λ1. A region 31 is delimited by two vertical lines 32 , 33 , which are determined in terms of position by intersection points Sp1 and Sp2. In region 31 there is a pronounced NOx conversion of the unmixed stratified exhaust gas by means of the pre-catalysts 18 , 19 , 20 and 21 , 22 , 23 .

Claims (6)

1. Abgasanlage mit Katalysatoreinrichtung für eine Brennkraftmaschine der Hubkolbenbauart, die vorzugsweise mehrere Zylinder mit Zylinderköpfen umfaßt, in denen zur Steuerung von Gasströmen Einlaßventile und Auslaßventile vorgesehen sind, dadurch gekennzeichnet, daß die Katalysatoreinrichtung (16) der Abgasanlage (1) einen Hauptkatalysator (17) und mehrere Vorkatalysatoren (18, 19, 20 und 21, 22, 23) aufweist, die relativ nahe am Zylinderkopf (11, 12) angeordnet sind, wobei jeder Vorkatalysator (z. B. 19) mit einer Dreiwege-Beschichtung mit geringstmöglicher Speicherfähigkeit versehen.1. Exhaust system with catalyst device for an internal combustion engine of the reciprocating piston type, which preferably comprises a plurality of cylinders with cylinder heads, in which inlet valves and exhaust valves are provided for controlling gas flows, characterized in that the catalyst device ( 16 ) of the exhaust system ( 1 ) has a main catalyst ( 17 ) and a plurality of pre-catalysts ( 18 , 19 , 20 and 21 , 22 , 23 ) which are arranged relatively close to the cylinder head ( 11 , 12 ), each pre-catalyst (e.g. 19 ) being provided with a three-way coating with the least possible storage capacity . 2. Abgasanlage nach Anspruch 1, dadurch gekennzeichnet, daß der Vorkatalysator (19) möglichst nahe an einem Auslaßkanal (24) des Zylinderkopfs (11, 12) bzw. an einem oder mehreren Auslaßventilen (15) angeordnet ist.2. Exhaust system according to claim 1, characterized in that the pre-catalyst ( 19 ) is arranged as close as possible to an exhaust port ( 24 ) of the cylinder head ( 11 , 12 ) or to one or more exhaust valves ( 15 ). 3. Abgasanlage nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß jeder Vorkatalysator (19) in die Abgasanlage (1) integriert ist.3. Exhaust system according to claims 1 and 2, characterized in that each pre-catalyst ( 19 ) is integrated in the exhaust system ( 1 ). 4. Abgasanlage nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Vorkatalysator (19) einerseits mit einem an den Zylinderkopf (11, 12) angeschlossenen Flansch (25) und andererseits mit einem Rohrstück (26) der Abgasanlage (1) verbunden ist.4. Exhaust system according to one or more of the preceding claims, characterized in that the pre-catalyst ( 19 ) on the one hand with a to the cylinder head ( 11 , 12 ) connected flange ( 25 ) and on the other hand with a pipe section ( 26 ) of the exhaust system ( 1 ) is. 5. Abgasanlage nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Vorkatalysator (19) einen kreiszylinderischen Querschnitt aufweist, wobei der Außendurchmesser (Am) und die Gesamtlänge (Gl) des Vorkatalysators (19) in etwa gleiche Abmessungen aufweisen. 5. Exhaust system according to one or more of the preceding claims, characterized in that the pre-catalyst ( 19 ) has a circular cylindrical cross section, the outer diameter (Am) and the total length (Gl) of the pre-catalyst ( 19 ) have approximately the same dimensions. 6. Abgasanlage nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Vorkatalysator (19) mit dem Flansch (25) und dem Rohrstück (26) durch Schweißen verbunden ist.6. Exhaust system according to one or more of the preceding claims, characterized in that the pre-catalyst ( 19 ) with the flange ( 25 ) and the pipe section ( 26 ) is connected by welding.
DE19904314A 1999-01-28 1999-01-28 Exhaust gas purifying device has a catalyst arrangement consisting of a main catalyst and several pre-catalysts arranged relatively near to the cylinder head Ceased DE19904314A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904314A DE19904314A1 (en) 1999-01-28 1999-01-28 Exhaust gas purifying device has a catalyst arrangement consisting of a main catalyst and several pre-catalysts arranged relatively near to the cylinder head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904314A DE19904314A1 (en) 1999-01-28 1999-01-28 Exhaust gas purifying device has a catalyst arrangement consisting of a main catalyst and several pre-catalysts arranged relatively near to the cylinder head

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DE19904314A1 true DE19904314A1 (en) 2000-08-17

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DE19904314A Ceased DE19904314A1 (en) 1999-01-28 1999-01-28 Exhaust gas purifying device has a catalyst arrangement consisting of a main catalyst and several pre-catalysts arranged relatively near to the cylinder head

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD133058A5 (en) * 1976-10-07 1978-11-29 Engelhard Min & Chem METHOD FOR THE CATALYTIC TRADING OF THE EXHAUST GASES OF TWO-STROKE COMBUSTION ENGINES
EP0460507A1 (en) * 1990-05-28 1991-12-11 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification system for an internal combustion engine
DE4117874A1 (en) * 1991-05-31 1992-12-03 Bayerische Motoren Werke Ag INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS TREATMENT DEVICE
DE4137105A1 (en) * 1991-11-12 1993-05-13 Schwaebische Huettenwerke Gmbh ARRANGEMENT OF A CATALYST FOR THE EXHAUST GAS FROM A COMBUSTION ENGINE
DE4406648C1 (en) * 1994-03-01 1995-08-10 Daimler Benz Ag Catalytic reduction of hydrocarbons, carbon monoxide and nitrogen oxides from i.c engine exhaust
DE19529835A1 (en) * 1995-08-12 1997-02-13 Opel Adam Ag Exhaust system of a gasoline engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD133058A5 (en) * 1976-10-07 1978-11-29 Engelhard Min & Chem METHOD FOR THE CATALYTIC TRADING OF THE EXHAUST GASES OF TWO-STROKE COMBUSTION ENGINES
EP0460507A1 (en) * 1990-05-28 1991-12-11 Toyota Jidosha Kabushiki Kaisha Exhaust gas purification system for an internal combustion engine
DE4117874A1 (en) * 1991-05-31 1992-12-03 Bayerische Motoren Werke Ag INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS TREATMENT DEVICE
DE4137105A1 (en) * 1991-11-12 1993-05-13 Schwaebische Huettenwerke Gmbh ARRANGEMENT OF A CATALYST FOR THE EXHAUST GAS FROM A COMBUSTION ENGINE
DE4406648C1 (en) * 1994-03-01 1995-08-10 Daimler Benz Ag Catalytic reduction of hydrocarbons, carbon monoxide and nitrogen oxides from i.c engine exhaust
DE19529835A1 (en) * 1995-08-12 1997-02-13 Opel Adam Ag Exhaust system of a gasoline engine

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