DE4322524A1 - Exhaust catalytic converter of an internal combustion engine - Google Patents

Exhaust catalytic converter of an internal combustion engine

Info

Publication number
DE4322524A1
DE4322524A1 DE4322524A DE4322524A DE4322524A1 DE 4322524 A1 DE4322524 A1 DE 4322524A1 DE 4322524 A DE4322524 A DE 4322524A DE 4322524 A DE4322524 A DE 4322524A DE 4322524 A1 DE4322524 A1 DE 4322524A1
Authority
DE
Germany
Prior art keywords
catalytic converter
internal combustion
combustion engine
housing
air gap
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.)
Withdrawn
Application number
DE4322524A
Other languages
German (de)
Inventor
Stephan Rubbert
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE4322524A priority Critical patent/DE4322524A1/en
Publication of DE4322524A1 publication Critical patent/DE4322524A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F01N3/2046—Periodically cooling 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
    • 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
    • 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
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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 ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/024—Exhaust treating devices having provisions not otherwise provided for for cooling the device using a liquid
    • 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

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (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)

Abstract

A catalytic converter, especially a pre-catalytic converter, is supported in a housing with the formation of an air gap, which housing has a coolant circuit of the internal combustion engine flowing around it. The air gap is dimensioned in such a way that at operating temperature the pre-catalytic converter bears on the inside wall of the housing over extensive surface areas as a result of thermal expansion. Undesirably large amounts of heat can then be thoroughly dissipated by way of the coolant circuit. When the catalytic converter cools down again the air gap is formed which, especially following a cold starting of the internal combustion engine, ensures rapid heating-up of the catalytic converter to its operating temperature by the hot exhaust gases.

Description

Die Erfindung betrifft einen Abgaskatalysator einer Brennkraftmaschine mit einem Trägerkörper für die kataly­ tische Schicht, der in einem vom Kühlmittelkreislauf der Brennkraftmaschine umspülten Gehäuse angeordnet ist, mit einem über weiten Bereichen der Trägerkörper-Oberfläche vorgesehenen Luftspalt zwischen Trägerkörper und Gehäuse bei kaltem Trägerkörper.The invention relates to an exhaust gas catalytic converter Internal combustion engine with a support body for the kataly table layer in a coolant circuit of the Internal combustion engine flushed housing is arranged with over a wide area of the carrier body surface provided air gap between the support body and the housing with cold carrier body.

Beispielsweise aus der DE-OS 25 09 210 ist es bekannt, einen Abgaskatalysator relativ nahe am Auslaßkanal einer Brennkraftmaschine anzuordnen, da hierdurch die Abgase weitgehend ungekühlt in den Katalysator gelangen, so daß dieser ausgehend von einem Kaltstart der Brennkraftma­ schine relativ kurzfristig seine Betriebstemperatur er­ reicht. Andererseits gilt es jedoch, im Dauerbetrieb den Katalysator vor einer Überhitzung zu schützen. Daher wird ein den Katalysator aufnehmendes Gehäuse vom Kühlmittel­ kreislauf der Brennkraftmaschine umspült, so daß schädi­ gende Wärmemengen über diesen Kühlmittelkreislauf ab­ transportiert werden können. Beim bekannten Stand der Technik ist zwischen dem vom Kühlmittelkreislauf umspül­ ten Gehäuse sowie dem katalytisch beschichteten Träger­ körper ein isolierender Luftspalt vorgesehen. For example from DE-OS 25 09 210 it is known a catalytic converter relatively close to the exhaust duct To arrange the internal combustion engine, as a result of which the exhaust gases get into the catalyst largely uncooled, so that this starting from a cold start of the internal combustion engine It seems that its operating temperature is relatively short-term enough. On the other hand, however, it is important in continuous operation To protect the catalytic converter from overheating. Therefore a coolant housing housing the catalytic converter circuit of the internal combustion engine, so that harmful amount of heat from this coolant circuit can be transported. In the known state of the Technology is between the coolant circuit housing and the catalytically coated support body an insulating air gap provided.  

Versuche haben gezeigt, daß aufgrund dieses über weiten Bereichen der Trägerkörper-Oberfläche vorgesehenen Luft­ spaltes zwischen dem Trägerkörper und dem Gehäuse keine ausreichende Wärmeabfuhr im Dauerbetrieb der Brennkraft­ maschine möglich ist. Insbesondere bei unregelmäßiger Verbrennung in den Brennkraftmaschinen-Zylindern, so bei­ spielsweise bei Zündaussetzern, bei Ausmagern oder auch bei Einsetzen einer Klopfregelung kann weiterhin die thermische Belastungsgrenze des Katalysators überschrit­ ten werden. Wird andererseits auf den Luftspalt vollstän­ dig verzichtet, d. h. liegt andererseits der Trägerkörper im wesentlichen vollständig am vom Kühlmittelkreislauf umspülten Gehäuse an, so wird bereits in der sich an einen Kaltstart anschließenden Warmlaufphase der Brenn­ kraftmaschine dieser Katalysator so stark abgekühlt, daß er seine Anspringtemperatur bzw. Betriebstemperatur zu spät erreichen. Erhöhte Schadstoffemissionen sind hiervon die Folge.Experiments have shown that because of this over Areas of the carrier body surface provided air gap between the support body and the housing none sufficient heat dissipation during continuous operation of the internal combustion engine machine is possible. Especially with irregular ones Combustion in the engine cylinders, so at for example with misfires, with leaners or also if a knock control is used, the thermal load limit of the catalyst exceeded be. On the other hand, it becomes complete on the air gap dig waived, d. H. on the other hand lies the carrier body essentially completely on the coolant circuit washed around the housing, so is already in the a warm start phase of the burner following a cold start engine this catalyst cooled so much that he his starting temperature or operating temperature too reach late. This includes increased pollutant emissions the consequence.

Aufgabe der Erfindung ist es daher, eine demgegenüber verbesserte Anordnung für einen Abgaskatalysator nach dem Oberbegriff des Anspruchs 1 aufzuzeigen. Zur Lösung dieser Aufgabe ist vorgesehen, daß der be­ triebswarme Trägerkörper aufgrund von Wärmedehnung in weiten Oberflächenbereichen am Gehäuse anliegt.The object of the invention is therefore one in contrast improved arrangement for an exhaust gas catalytic converter after the Show preamble of claim 1. To solve this problem it is provided that the be warm carrier body due to thermal expansion in wide surface areas on the housing.

Erläutert wird dies sowie weitere ggf. erfindungswesent­ liche Merkmale anhand einer Prinzipskizze. In dieser Skizze ist mit der Bezugsziffer 1 ein katalytisch be­ schichteter Trägerkörper bezeichnet, der wie bekannt, eine Vielzahl von Kanälen für einen gemäß Pfeilrichtung 2 durch den Trägerkörper 1 hindurchgeleiteten Abgasstrom einer Brennkraftmaschine aufweist. Über einen geeignet gestalteten Zentrierring 3 oder dgl. ist der Trägerkörper 1 in einem Gehäuse 4 gelagert, das vom Kühlmittelkreislauf 5 der nicht gezeigten Brennkraftmaschine umspült ist. Geführt wird dieser Kühlmittelkreislauf somit einer­ seits von Außenwand des Gehäuses 4 sowie andererseits von einer geeignet gestalteten Begrenzungswand 6.This is explained, as well as further features that are possibly essential to the invention, using a schematic diagram. In this sketch, the reference numeral 1 denotes a catalytically coated carrier body which, as is known, has a multiplicity of channels for an exhaust gas stream of an internal combustion engine passed through the carrier body 1 in the direction of the arrow 2 . Via a suitably designed centering ring 3 or the like. The carrier body 1 is mounted in a housing 4 which is surrounded by the coolant circuit 5 of the internal combustion engine, not shown. This coolant circuit is thus guided on the one hand by the outer wall of the housing 4 and on the other hand by a suitably designed boundary wall 6 .

Mit der gezeigten Anordnung bzw. Lagerung des Trägerkör­ pers 1 innerhalb des Gehäuses 4 ergibt sich über weiten Bereichen der Trägerkörper-Oberfläche der mit der Bezugs­ ziffer 7 bezeichnete Luftspalt zwischen dem Trägerkörper 1 sowie dem Gehäuse 4. Dieser Luftspalt verhindert, daß anschließend an einen Kaltstart der Brennkraftmaschine die Wärmemenge, die dazu benötigt wird, den Abgaskataly­ sator schnell auf seine Betriebstemperatur zu bringen, über den Kühlmittelkreislauf 5 abgeführt wird. Der ge­ zeigte Katalysator erreicht somit nach einem Kaltstart umgehend seine Betriebstemperatur und beginnt erfolgreich mit der Schadstoff-Konversion. Bei weiterem Betrieb der Brennkraftmaschine und insbesondere bei vermehrtem Abgas­ strom 2, hervorgerufen durch eine höhere Brennkraftma­ schinen-Belastung, nimmt die Temperatur des Katalysators weiter zu, so daß sich der Trägerkörper 1 aufgrund von Wärmedehnung solange ausdehnt, bis die Mantelfläche 1′ an der Innenseite des Gehäuses 4 zumindest bereichsweise an­ liegt, so daß nun die im Katalysator vorhandene Wärme durch Wärmeleitung in gesteigertem Maße in den Kühlmit­ telkreislauf 5 gelangen kann. Während nämlich bei Vorhan­ densein eines Luftspaltes 7 eine Wärmeabgabe vom Träger­ körper 1 an den Kühlmittelkreislauf 5 nur über Wärme­ strahlung erfolgen kann, tritt dann, wenn der betriebs­ warme Trägerkörper 1 am Gehäuse 4 anliegt, direkte Wärme­ leitung auf, über die bekanntermaßen größere Wärmemengen transportiert werden können. Eine Überhitzung des kataly­ tisch beschichteten Trägerkörpers 1 wird somit erfolg­ reich verhindert. With the arrangement shown, or storage of the Trägerkör pers 1 within the housing 4, the support body surface of the reference numeral with 7 designated air gap between the carrier body 1 and the casing 4 results over a wide range. This air gap prevents subsequent to a cold start of the internal combustion engine, the amount of heat required to quickly bring the exhaust gas catalyst to its operating temperature is dissipated via the coolant circuit 5 . The catalyst shown thus immediately reaches its operating temperature after a cold start and starts successfully with the pollutant conversion. With further operation of the internal combustion engine and in particular with increased exhaust gas flow 2 , caused by a higher internal combustion engine load, the temperature of the catalyst continues to increase, so that the carrier body 1 expands due to thermal expansion until the outer surface 1 'on the inside of the housing 4 is at least in some areas, so that the heat present in the catalytic converter can now reach the coolant circuit 5 by heat conduction to an increased extent. While namely in Vorhan densein an air gap 7, heat can be released from the carrier body 1 to the coolant circuit 5 only via heat radiation, then occurs when the operationally warm carrier body 1 is applied to the housing 4 , direct heat conduction via which larger amounts of heat are known to be transported can be. Overheating of the catalytically coated support body 1 is thus successfully prevented.

Nach Abstellen der Brennkraftmaschine kühlt sich auch der Trägerkörper 1 ab und zieht sich zusammen. Hierdurch wird wieder der gezeigte, isolierende Luftspalt 7 gebildet, so daß bei einem neuerlichen Start der Brennkraftmaschine der Katalysator auch schnell wieder seine Betriebstempe­ ratur erreicht. Über die Größe des Luftspaltes bei Umge­ bungstemperatur bzw. bei kaltem Trägerkörper 1 ist die Grenztemperatur einstellbar, bei welcher die Wärmeleitung beginnt. Besonders vorteilhaft und wirksam ist die ge­ zeigte Katalysatoranordnung für die sog. Vorkatalysato­ ren, die nahe des und bevorzugt im Auslaßkanal eines Brennkraftmaschinen-Zylinderkopfes gelagert bzw. angeord­ net sind. In diesem Falle kann das Gehäuse 4 selbst die Wand des Auslaßkanales sein. Bei diesen relativ kleinen Vorkatalysatoren, die jeweils das Abgas eines einzigen Brennkraftmaschinen-Zylinders konvertieren, liegt ein be­ sonders günstiges Größenverhältnis zwischen dem Volumen des Katalysators sowie der wärmeabführenden Mantelfläche 1′ vor.After the internal combustion engine has been switched off, the carrier body 1 also cools down and contracts. As a result, the insulating air gap 7 shown is formed again, so that when the internal combustion engine is started again, the catalytic converter also quickly reaches its operating temperature. About the size of the air gap at ambient temperature or cold support body 1 , the limit temperature is adjustable at which the heat conduction begins. Particularly advantageous and effective is the catalyst arrangement shown for the so-called precatalysts, which are mounted close to and preferably in the exhaust port of an internal combustion engine cylinder head or are arranged. In this case, the housing 4 itself can be the wall of the outlet channel. In these relatively small pre-catalysts, each converting the exhaust gas from a single internal combustion engine cylinder, there is a particularly favorable size ratio between the volume of the catalyst and the heat-dissipating outer surface 1 '.

Das vorgeschlagene Kühlkonzept ermöglicht die thermische Isolation des beispielsweise monolithischen Trägerkörpers 1 im Warmlauf der Brennkraftmaschine und stellt gleich­ zeitig seine Kühlung bei hohen Abgastemperaturen sicher. Damit wird die thermische Belastung des Katalysators ver­ ringert und hohe Konversionsraten auch bei langer Be­ triebsdauer sichergestellt. Bei einem Kaltstart erreicht der Katalysator schneller seine Betriebstemperatur und vermindert somit erfolgreich die Schadstoffemissionen während des Warmlaufs der Brennkraftmaschine. Wird die beschriebene Anordnung für ein Fahrzeug gewählt, so ver­ hindert der ebenfalls beschriebene brennkraftmaschinen­ nahe Einbau, daß bei niedrigen Fahrzeuggeschwindigkeiten sowie im Leerlauf der Katalysator auskühlt und nicht mehr zu konvertieren in der Lage ist. Somit kann der Leerlauf verbrauchsgünstiger ausgelegt und der Kraftstoffverbrauch abgesenkt werden. Zur Aufheizung des Katalysators sind keine zusätzlichen Maßnahmen, wie beispielsweise Sekun­ därlufteinblasung oder elektrische Katalysatorheizung er­ forderlich. Auch kann das beschriebene System direkt an die Auslaßkanäle des Brennkraftmaschinen-Zylinderkopfes angeflanscht werden und ist deshalb auch zur Nachrüstung für Altfahrzeuge geeignet.The proposed cooling concept enables the thermal insulation of the, for example, monolithic carrier body 1 when the internal combustion engine is warming up and at the same time ensures its cooling at high exhaust gas temperatures. This reduces the thermal load on the catalytic converter and ensures high conversion rates even with long operating times. With a cold start, the catalytic converter reaches its operating temperature more quickly and thus successfully reduces the pollutant emissions during the warm-up of the internal combustion engine. If the arrangement described is selected for a vehicle, the internal combustion engine also described, which prevents installation, prevents the catalyst from cooling at low vehicle speeds and when idling and is no longer able to convert. This means that idling can be designed to be more fuel efficient and fuel consumption can be reduced. No additional measures, such as secondary air injection or electric catalyst heating, are required to heat the catalyst. The system described can also be flanged directly to the exhaust ports of the internal combustion engine cylinder head and is therefore also suitable for retrofitting for old vehicles.

Claims (2)

1. Abgaskatalysator einer Brennkraftmaschine mit einem Trägerkörper (1) für die katalytische Schicht, der in einem vom Kühlmittelkreislauf (5) der Brennkraft­ maschine umspülten Gehäuse (4) angeordnet ist, mit einem über weiten Bereichen der Trägerkörper-Mantel­ fläche (1′) vorgesehenen Luftspalt (7) zwischen Trä­ gerkörper (1) und Gehäuse (4) bei kaltem Trägerkör­ per, dadurch gekennzeichnet, daß der betriebswarme Trä­ gerkörper (1) aufgrund von Wärmedehnung in weiten Mantelflächenbereichen (1′) am Gehäuse (4) anliegt.1. Exhaust gas catalytic converter of an internal combustion engine with a carrier body ( 1 ) for the catalytic layer, which is arranged in a coolant circuit ( 5 ) of the internal combustion engine washed housing ( 4 ), with a wide area of the carrier body-jacket surface ( 1 ') provided Air gap ( 7 ) between the carrier body ( 1 ) and the housing ( 4 ) when the carrier body is cold, characterized in that the operating body ( 1 ) rests on the housing ( 4 ) due to thermal expansion in wide lateral surface areas ( 1 '). 2. Abgaskatalysator nach Anspruch 1, dadurch gekennzeichnet, daß das Gehäuse (4) im Aus­ laßkanal des Brennkraftmaschinen-Zylinderkopfes ge­ lagert oder durch diesen gebildet ist.2. Exhaust gas catalytic converter according to claim 1, characterized in that the housing ( 4 ) in the outlet channel from the internal combustion engine cylinder head is supported or formed by this.
DE4322524A 1993-07-06 1993-07-06 Exhaust catalytic converter of an internal combustion engine Withdrawn DE4322524A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4322524A DE4322524A1 (en) 1993-07-06 1993-07-06 Exhaust catalytic converter of an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4322524A DE4322524A1 (en) 1993-07-06 1993-07-06 Exhaust catalytic converter of an internal combustion engine

Publications (1)

Publication Number Publication Date
DE4322524A1 true DE4322524A1 (en) 1995-02-23

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Application Number Title Priority Date Filing Date
DE4322524A Withdrawn DE4322524A1 (en) 1993-07-06 1993-07-06 Exhaust catalytic converter of an internal combustion engine

Country Status (1)

Country Link
DE (1) DE4322524A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6082101A (en) * 1996-07-26 2000-07-04 Hitachi, Ltd. Exhaust gas purifier for engines
DE102017221623A1 (en) 2017-12-01 2019-06-06 Bayerische Motoren Werke Aktiengesellschaft Exhaust system for an internal combustion engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2345383A1 (en) * 1973-09-08 1975-03-20 Daimler Benz Ag I.C. engine with exhaust gas afterburner - has exhaust system with catalytic gas permeable insets within exhaust ducts
DE2509210A1 (en) * 1975-03-04 1976-09-16 Gewerk Eisenhuette Westfalia CATALYST DEVICE FOR DETOXIFYING EXHAUST GASES FROM COMBUSTION MACHINES, IN PARTICULAR DIESEL ENGINES, FOR USE IN UNDERGROUND PIT ROOMS OR OTHER HAZARDOUS AREAS
DE3736500C2 (en) * 1987-10-28 1991-03-07 Kst-Motorenversuch Gmbh & Co Kg, 6702 Bad Duerkheim, De

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2345383A1 (en) * 1973-09-08 1975-03-20 Daimler Benz Ag I.C. engine with exhaust gas afterburner - has exhaust system with catalytic gas permeable insets within exhaust ducts
DE2509210A1 (en) * 1975-03-04 1976-09-16 Gewerk Eisenhuette Westfalia CATALYST DEVICE FOR DETOXIFYING EXHAUST GASES FROM COMBUSTION MACHINES, IN PARTICULAR DIESEL ENGINES, FOR USE IN UNDERGROUND PIT ROOMS OR OTHER HAZARDOUS AREAS
DE3736500C2 (en) * 1987-10-28 1991-03-07 Kst-Motorenversuch Gmbh & Co Kg, 6702 Bad Duerkheim, De

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6082101A (en) * 1996-07-26 2000-07-04 Hitachi, Ltd. Exhaust gas purifier for engines
DE19732167C2 (en) * 1996-07-26 2001-03-01 Hitachi Ltd Exhaust gas purification device for internal combustion engines
DE102017221623A1 (en) 2017-12-01 2019-06-06 Bayerische Motoren Werke Aktiengesellschaft Exhaust system for an internal combustion engine

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