AT502367B1 - METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS CLEANING SYSTEM - Google Patents

METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS CLEANING SYSTEM Download PDF

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Publication number
AT502367B1
AT502367B1 AT0203006A AT20302006A AT502367B1 AT 502367 B1 AT502367 B1 AT 502367B1 AT 0203006 A AT0203006 A AT 0203006A AT 20302006 A AT20302006 A AT 20302006A AT 502367 B1 AT502367 B1 AT 502367B1
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Austria
Prior art keywords
catalyst
exhaust gas
probe
internal combustion
combustion engine
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AT0203006A
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German (de)
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AT502367A3 (en
AT502367A2 (en
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Paul Dr Kapus
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Avl List Gmbh
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Priority to AT0203006A priority Critical patent/AT502367B1/en
Publication of AT502367A2 publication Critical patent/AT502367A2/en
Priority to PCT/EP2007/061994 priority patent/WO2008061886A1/en
Priority to DE112007002825T priority patent/DE112007002825A5/en
Publication of AT502367A3 publication Critical patent/AT502367A3/en
Priority to US11/987,913 priority patent/US20080134670A1/en
Application granted granted Critical
Publication of AT502367B1 publication Critical patent/AT502367B1/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
    • 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
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • 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
    • F01N3/2093—Periodically blowing a gas through the converter, e.g. in a direction opposite to exhaust gas flow or by reversing exhaust gas flow direction
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

2 AT 502 367 B12 AT 502 367 B1

Die Erfindung betrifft eine Brennkraftmaschine mit einem Abgasreinigungssystem, welches zumindest einen Katalysator aufweist, wobei die Abgasströmung durch den Katalysator umkehrbar ist.The invention relates to an internal combustion engine having an exhaust gas purification system, which has at least one catalyst, wherein the exhaust gas flow through the catalyst is reversible.

Katalysatoren von Abgasreinigungssystemen sind bei langer Betriebszeit der Brennkraftmaschinen einem Alterungsvorgang unterworfen. Dieser Alterungsvorgang bewirkt eine zunehmende Verschlechterung der Emissionswerte, wodurch in vielen Fällen ein kostenaufwändiger Austausch von Katalysatoren erforderlich ist.Catalysts of emission control systems are subjected to an aging process with long operating time of the internal combustion engines. This aging process causes a progressive deterioration of the emission levels, which in many cases, a costly replacement of catalysts is required.

Die DE 196 40 604 A1 offenbart ein Verfahren zur Reaktivierung/Regeneration von Abgaskatalysatoren. Dabei wird durch Umkehren der Durchströmungsrichtung mittels Umdrehen, durch Abtrennung des deaktivierten Teiles oder durch Umlenken des Hauptabgasstromes zu den noch nicht deaktivierten Kanälen an der Außenseite des Katalysators das frühzeitige Recycling des Katalysators vermieden.DE 196 40 604 A1 discloses a process for the reactivation / regeneration of catalytic converters. In this case, by reversing the direction of flow by turning, by separating the deactivated part or by diverting the main exhaust gas stream to the not yet deactivated channels on the outside of the catalyst, the early recycling of the catalyst is avoided.

Die DE 43 01 286 A1 beschreibt ein Katalysatorelement für eine Schiffsantriebsvorrichtung, welches von einer ersten Orientierung in eine sich von der ersten Orientierung unterscheidende zweite Orientierung umorientiert werden kann. Dadurch wird erreicht, dass sich ablagernde Rückstände von dem Katalysatorelement wieder weggeblasen werden, nachdem dieses so umorientiert worden ist, dass die vorher dem Abgaseinlass zugewandte Seite nun dem Abgasauslass zugewandt ist. Auf diese Weise wird die Lebensdauer des Katalysatorelementes verlängert.DE 43 01 286 A1 describes a catalyst element for a ship propulsion device, which can be reoriented from a first orientation into a second orientation that differs from the first orientation. This ensures that depositing residues are blown away from the catalyst element again after it has been reoriented so that the previously the exhaust inlet facing side is now facing the exhaust outlet. In this way, the life of the catalyst element is prolonged.

Die US 3,072,457 A zeigt eine Anordnung mit zwei Katalysatoren, bei welcher mittels eines Ventils die Strömungsrichtung des Abgases durch die Katalysatoren umgekehrt wird. Die Umkehrung der Strömungsrichtung erfolgt in bestimmten Zeitabständen.US Pat. No. 3,072,457 A shows an arrangement with two catalysts in which the direction of flow of the exhaust gas through the catalysts is reversed by means of a valve. The reversal of the flow direction takes place at certain intervals.

Die DE 198 35 565 A1 beschreibt eine Vorrichtung zur Nachbehandlung von Motorabgasen eines Dieselmotors, welche einen vom Abgas durchströmten Monolithen aufweist, der im Abgasstrom drehbar angeordnet ist. Durch das Drehen des Monolithen wird eine zu starke Anreicherung der Partikel vermieden. Weiters können durch freie Regelbarkeit der Rotation gezählte Regenerationsmaßnahmen für den Monolithen eingeleitet werden.DE 198 35 565 A1 describes a device for the after-treatment of engine exhaust gases of a diesel engine, which has a monolith flowed through by the exhaust gas, which is rotatably arranged in the exhaust gas stream. By turning the monolith an excessive accumulation of the particles is avoided. Furthermore, counted regeneration measures for the monolith can be initiated by free controllability of the rotation.

Aufgabe der Erfindung ist es, diesen Nachteil zu vermeiden und die Einsatzzeit eines Katalysators in einem Abgasreinigungssystem zu verlängern.The object of the invention is to avoid this disadvantage and to extend the service life of a catalyst in an exhaust gas purification system.

Erfindungsgemäß wird dies dadurch erreicht, dass eine erste Einbauposition für eine erste Lambdasonde stromaufwärts des Katalysators und eine zweite Einbauposition für eine zweite Lambdasonde stromabwärts des Katalysators vorgesehen ist, wobei die ersten und die zweiten Einbaupositionen symmetrisch bezüglich der Querebene angeordnet sind, wobei vorzugsweise die Einbaupositionen identische Einschraubgewinde für die Lambdasonden aufweisen.According to the invention, this is achieved by providing a first installation position for a first lambda probe upstream of the catalytic converter and a second installation position for a second lambda probe downstream of the catalytic converter, wherein the first and the second installation positions are arranged symmetrically with respect to the transverse plane, wherein preferably the installation positions are identical Screw thread for the lambda probes have.

Die Erfindung macht sich die Tatsache zu Nutzen, dass der erste Bereich des Katalysators, welcher den höchsten Temperaturspitzen ausgesetzt ist, der stärksten Alterung unterworfen ist, während Bereiche des Katalysators, welche stromabwärts dieses alterungsanfälligsten Bereiches liegen, nicht oder kaum einer Alterung unterworfen sind. Durch Umkehren der Strömungsrichtung des Katalysators könnte somit die Umsetzrate des Katalysators wieder erhöht und somit die Abgasqualität verbessert werden, ohne dass eine Erneuerung des Katalysators erforderlich wäre.The invention takes advantage of the fact that the first region of the catalyst which is exposed to the highest temperature peaks is subjected to the greatest aging, while regions of the catalyst which are downstream of this age-most susceptible region are not or scarcely subject to aging. By reversing the flow direction of the catalyst, the conversion rate of the catalyst could thus be increased again and thus the exhaust gas quality could be improved without renewing the catalyst being necessary.

Die Alterung des Katalysators bewirkt, dass der erste Teil des Katalysators inaktiv wird. Dies führt zu einem verspäteten Anspringen des Kats (erhöhter Anspringtemperatur) nach einem Kaltstart, da der erste Teil des Kats zwar Wärme aufnimmt, aber nicht zur Konvertierung von Schadstoffen beiträgt. Nach Wenden des Kats ist der vorderste Teil des Kats wieder aktiv. Die Anspringtemperatur sinkt wieder.The aging of the catalyst causes the first part of the catalyst to become inactive. This leads to a delayed start of the cat (increased light-off temperature) after a cold start, since the first part of the cat absorbs heat, but does not contribute to the conversion of pollutants. After turning the cat, the foremost part of the cat is active again. The light-off temperature drops again.

Claims (2)

3 AT 502 367 B1 Der Katalysator kann nach einer definierten Betriebszeit der Brennkraftmaschine oder nach einer bestimmten Kilometerleistung gewendet werden, wobei beispielsweise der Katalysator ausgebaut und um 180° verdreht mit umgekehrter Strömungsrichtung wieder in das Abgasreinigungssystem eingebaut werden kann. Dies ermöglicht hohe Standzeiten des Katalysators. Diese Maßnahme könnte beispielsweise im Rahmen eines normalen Motorservices in einer Werkstatt durchgeführt werden. Voraussetzung dafür ist, dass der Katalysator wendbar aufgebaut ist, wobei vorzugsweise der Katalysator bezüglich einer Querebene, welche normal zur Strömungsrichtung angeordnet ist, symmetrisch ausgebildet ist. Abgasreinigungssysteme mit Katalysatoren weisen üblicherweise Einbaupositionen für Lambdasonden stromaufwärts und stromabwärts des Katalysators auf. Die Sonde stromaufwärts des Katalysators ist dabei die Regelsonde, die Sonde stromabwärts des Katalysators ist die Diagnosesonde. Die Lambdasonden können dabei im Abgasrohr vor, bzw. nach dem Katalysator oder im Konus vor oder nach dem Katalysator angeordnet sein. Die Erfindung wird im Folgenden anhand der Figur näher erläutert. Die Figur zeigt schematisch eine Brennkraftmaschine 1 mit einem Abgassystem 2, in welchem ein Abgasreinigungssystem 3 mit einem Katalysator 4 angeordnet ist. Der Katalysator 4 ist symmetrisch bezüglich einer normal zur Strömungsrichtung S angeordneten Querebene ε ausgebildet. Darüber hinaus sind auch die zum Beispiel im Eintritts- bzw. Austrittskonus 7, 8 des Katalysators 4 vorgesehenen Einbaupositionen 5, 6 für nicht weiter dargestellte Lambdasonden stromauf- bzw. stromabwärts des Katalysators 4 symmetrisch bezüglich der Querebene ε ausgebildet. Auch die Einschraubgewinde für die Lambdasonden sind identisch angeführt, so dass bei umgekehrten Einbau des Katalysators 4 die Lambdasonden gewechselt werden können, wobei die Funktion der stromaufwärtigen Lambdasonde als Regelsonde und der stromab-wärtigen Lambdasonde als Diagnosesonde beibehalten werden kann. Dadurch ist es möglich, den Katalysator 4 unabhängig von der Abgasströmungsrichtung S in das Abgassystem 2 einzubauen. Nach einer definierten Kilometerleistung von beispielsweise 100.000 km wird der Katalysator 4 aus dem Abgasstrang ausgebaut und um 180° gewendet wieder eingebaut. Durch diese Maßnahme wird erreicht, dass das Abgas aus der Brennkraftmaschine 1 zuerst eingangsseitige Bereiche 4a des Katalysators durchströmt, welche bisher wenig oder nicht der thermischen Alterung unterworfen waren, während stark gealterte Bereiche 4b im Bereich des Katalysatoraustrittes angeordnet sind. Durch Wenden des Katalysators 4 im Auslasssystem 2 kann somit die Konvertierrate des Katalysators 4 wesentlich verbessert und die Qualität der Emissionen ohne Erneuerung des Katalysators 4 entscheidend angehoben werden. Die Maßnahme des gewendeten Einbaues eines symmetrisch ausgebildeten Katalysators 4 kann auch beim Einsatz von gebrauchten Austauschkatalysatoren verwendet werden, welche in umgekehrter Strömungsrichtung als bisher eingebaut werden und bildet somit eine kostengünstige Möglichkeit, um die Laufzeit der Brennkraftmaschine 1 unter Einhaltung der gesetzlichen Emissionsvorgaben ohne Einsatz eines neuen Katalysators zu verlängern. Patentansprüche: 1. Brennkraftmaschine (1) mit einem Abgasreinigungssystem, welches zumindest einen Katalysator (4) aufweist, wobei die Abgasströmung durch den Katalysator (4) umkehrbar ist, dadurch gekennzeichnet, dass eine erste Einbauposition (5) für eine erste Lambdasonde stromaufwärts des Katalysators (4) und eine zweite Einbauposition (6) für eine zweite Lambdasonde stromabwärts des Katalysators (4) vorgesehen ist, wobei die ersten und die zweiten Einbaupositionen (5, 6) symmetrisch bezüglich der Querebene (ε) angeordnet sind, wobei vorzugsweise die Einbaupositionen (5, 6) identische Einschraubgewinde für die 4 AT 502 367 B1 Lambdasonden aufweisen.3 AT 502 367 B1 The catalyst can be turned after a defined period of operation of the internal combustion engine or after a certain mileage, for example, the catalyst removed and rotated by 180 ° with reverse flow direction can be reinstalled in the emission control system. This allows a long service life of the catalyst. This measure could for example be carried out in the context of a normal engine service in a workshop. The prerequisite for this is that the catalyst is designed to be reversible, wherein preferably the catalyst is symmetrical with respect to a transverse plane which is arranged normal to the flow direction. Exhaust gas purification systems with catalytic converters usually have installation positions for lambda probes upstream and downstream of the catalytic converter. The probe upstream of the catalyst is the control probe, the probe downstream of the catalyst is the diagnostic probe. The lambda probes can be arranged in the exhaust pipe before, or after the catalyst or in the cone before or after the catalyst. The invention will be explained in more detail below with reference to FIG. The figure shows schematically an internal combustion engine 1 with an exhaust system 2, in which an exhaust gas purification system 3 with a catalyst 4 is arranged. The catalyst 4 is symmetrical with respect to a normal to the flow direction S arranged transverse plane ε formed. In addition, the installation positions 5, 6, which are provided, for example, in the inlet or outlet cone 7, 8 of the catalytic converter 4, are also formed symmetrically with respect to the transverse plane ε upstream or downstream of the catalytic converter 4 for lambda probes (not shown). The Einschraubgewinde for the lambda probes are listed identically, so that in reverse installation of the catalyst 4, the lambda probes can be changed, the function of the upstream lambda probe can be maintained as a control probe and downstream lambda probe as a diagnostic probe. As a result, it is possible to install the catalyst 4 in the exhaust system 2 independently of the exhaust gas flow direction S. After a defined mileage of, for example, 100,000 km, the catalyst 4 is removed from the exhaust system and turned over again by 180 °. By this measure it is achieved that the exhaust gas from the internal combustion engine 1 first flows through inlet-side regions 4a of the catalyst, which were previously subjected to little or no thermal aging, while strongly aged regions 4b are arranged in the region of the catalyst outlet. By turning the catalyst 4 in the exhaust system 2, the conversion rate of the catalyst 4 can thus be substantially improved and the quality of the emissions can be significantly increased without renewing the catalyst 4. The measure of the reversed installation of a symmetrically shaped catalyst 4 can also be used in the use of used replacement catalysts, which are installed in reverse flow direction than before and thus forms a cost-effective way to the life of the internal combustion engine 1 in compliance with legal emission specifications without the use of a new To extend the catalyst. 1. Internal combustion engine (1) with an exhaust gas purification system, which has at least one catalyst (4), wherein the exhaust gas flow through the catalyst (4) is reversible, characterized in that a first installation position (5) for a first lambda probe upstream of the catalyst (4) and a second installation position (6) for a second lambda probe downstream of the catalyst (4) is provided, wherein the first and the second mounting positions (5, 6) are arranged symmetrically with respect to the transverse plane (ε), wherein preferably the mounting positions ( 5, 6) have identical screw threads for the 4 AT 502 367 B1 lambda probes. 2. Brennkraftmaschine (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Katalysator (4) bezüglich einer Querebene (ε), welche normal zur Strömungsrichtung (S) angeordnet ist, symmetrisch ausgebildet ist. Hiezu 1 Blatt ZeichnungenSecond internal combustion engine (1) according to claim 1, characterized in that the catalyst (4) with respect to a transverse plane (ε), which is arranged normal to the flow direction (S), is symmetrical. For this purpose 1 sheet of drawings
AT0203006A 2006-11-22 2006-12-07 METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS CLEANING SYSTEM AT502367B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT0203006A AT502367B1 (en) 2006-12-07 2006-12-07 METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS CLEANING SYSTEM
PCT/EP2007/061994 WO2008061886A1 (en) 2006-11-22 2007-11-07 Method for regenerating at least one exhaust gas after-treatment device
DE112007002825T DE112007002825A5 (en) 2006-11-22 2007-11-07 Method for regeneration of at least one exhaust aftertreatment device
US11/987,913 US20080134670A1 (en) 2006-12-07 2007-12-05 Internal combustion engine with an exhaust emission control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0203006A AT502367B1 (en) 2006-12-07 2006-12-07 METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS CLEANING SYSTEM

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AT502367A2 AT502367A2 (en) 2007-03-15
AT502367A3 AT502367A3 (en) 2007-11-15
AT502367B1 true AT502367B1 (en) 2009-02-15

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Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN102155276A (en) * 2011-01-26 2011-08-17 烟台华龙商用机器有限公司 Tail gas emission purification system of diesel engine

Citations (4)

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Publication number Priority date Publication date Assignee Title
US3072457A (en) * 1960-05-31 1963-01-08 Universal Oil Prod Co Method of catalytically purifying exhaust gases of internal combustion engines and regenerating the lead-contaminated catalyst
DE4301286A1 (en) * 1992-01-21 1993-07-22 Outboard Marine Corp Catalyst element for ship drive equipment - involves propeller shaft and housing contg exhaust gas inlet and outlet and support catalyst element which can be orientated between first and second orientations
DE19640604A1 (en) * 1996-10-01 1998-04-02 Andreas Dipl Ing Gifhorn Apparatus for purifying exhaust gases
DE19835565A1 (en) * 1998-08-06 2000-02-10 Volkswagen Ag Vehicle exhaust gas treatment unit with reversible gas flow-path controlled temperature profile, for reduction and degradation of nitrogen oxides, hydrocarbons, and sulfur dioxide

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DE19734670C1 (en) * 1997-08-11 1999-05-27 Daimler Chrysler Ag Exchanging test for lambda sensors
US7279140B2 (en) * 2001-07-12 2007-10-09 Delphi Technologies, Inc. Catalytic converter with integral oxygen sensor
JP2003129827A (en) * 2001-10-25 2003-05-08 Komatsu Ltd Handling method for diesel particulate filter
US7210287B2 (en) * 2004-03-24 2007-05-01 General Motors Corporation Accelerating catalytic conversion
WO2006057305A1 (en) * 2004-11-25 2006-06-01 Komatsu Ltd. Exhaust gas purification device for internal combustion engine
US20070289293A1 (en) * 2006-06-15 2007-12-20 Gm Global Technology Operations, Inc. Diesel Exhaust System Reversible Particulate Filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3072457A (en) * 1960-05-31 1963-01-08 Universal Oil Prod Co Method of catalytically purifying exhaust gases of internal combustion engines and regenerating the lead-contaminated catalyst
DE4301286A1 (en) * 1992-01-21 1993-07-22 Outboard Marine Corp Catalyst element for ship drive equipment - involves propeller shaft and housing contg exhaust gas inlet and outlet and support catalyst element which can be orientated between first and second orientations
DE19640604A1 (en) * 1996-10-01 1998-04-02 Andreas Dipl Ing Gifhorn Apparatus for purifying exhaust gases
DE19835565A1 (en) * 1998-08-06 2000-02-10 Volkswagen Ag Vehicle exhaust gas treatment unit with reversible gas flow-path controlled temperature profile, for reduction and degradation of nitrogen oxides, hydrocarbons, and sulfur dioxide

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AT502367A3 (en) 2007-11-15
AT502367A2 (en) 2007-03-15
US20080134670A1 (en) 2008-06-12

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