DE4007516C2 - Diesel engine - Google Patents

Diesel engine

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Publication number
DE4007516C2
DE4007516C2 DE4007516A DE4007516A DE4007516C2 DE 4007516 C2 DE4007516 C2 DE 4007516C2 DE 4007516 A DE4007516 A DE 4007516A DE 4007516 A DE4007516 A DE 4007516A DE 4007516 C2 DE4007516 C2 DE 4007516C2
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DE
Germany
Prior art keywords
exhaust gas
line
diesel engine
exhaust
gas recirculation
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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.)
Expired - Fee Related
Application number
DE4007516A
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German (de)
Other versions
DE4007516A1 (en
Inventor
Hans Houben
Manfred Hoecker
Werner Dr Dietrich
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Deutz AG
Original Assignee
Kloeckner Humboldt Deutz AG
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Priority to DE4007516A priority Critical patent/DE4007516C2/en
Publication of DE4007516A1 publication Critical patent/DE4007516A1/en
Application granted granted Critical
Publication of DE4007516C2 publication Critical patent/DE4007516C2/en
Anticipated expiration legal-status Critical
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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
    • 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
    • F01N13/009—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 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel 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
    • F01N3/10—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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/60—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to air intake pressure
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Description

Die Erfindung betrifft einen Dieselmotor mit geringer Schadstoffemission und niedrigem Kraftstoffverbrauch, ins­ besondere nach dem Oberbegriff des Anspruchs 1.The invention relates to a diesel engine with less Pollutant emissions and low fuel consumption, ins special according to the preamble of claim 1.

Zunehmende Umweltverschmutzung und schwindende Energiere­ serven erfordern Brennkraftmaschinen mit geringer Schad­ stoffemission und niedrigem Kraftstoffverbrauch. Diese Forderungen gelten insbesondere auch für stationäre Brenn­ kraftmaschinen, die den Vorschriften der 1986 novellierten technischen Anleitung Luft (TA Luft) genügen müssen.Increasing pollution and dwindling energies serve require internal combustion engines with little damage emissions and low fuel consumption. This Requirements also apply in particular to stationary burning engines that were amended in 1986 technical instructions for air (TA Luft) must suffice.

In der DE 36 01 703 werden Maßnahmen zur Verminderung der Schadstoffemission von Dieselmotoren beschrieben. Es han­ delt sich dabei um eine Anordnung mit katalytisch be­ schichteten Partikelfiltern in den einzelnen Zweigen einer Abgasleitung kurz hinter den jeweiligen Zylinderköpfen in Verbindung mit einer Rückführung von gefiltertem Abgas in die Ansaugkanäle der einzelnen Zylinderköpfe. Dadurch sol­ len die Partikelemission und die Emission des gasförmigen Schadstoffes NOX sowie durch die katalytische Beschichtung des Partikelfilters die gasförmigen Schadstoffe CO und HC vermindert werden.DE 36 01 703 measures to reduce the Pollutant emissions from diesel engines described. It han is an arrangement with catalytic be layered particle filters in the individual branches of a Exhaust pipe just behind the respective cylinder heads in Connection with a recirculation of filtered exhaust gas in the intake ports of the individual cylinder heads. Thereby sol len the particle emission and the emission of the gaseous Pollutant NOX and the catalytic coating the particulate filter contains the gaseous pollutants CO and HC can be reduced.

Ein Nachteil dieser Anordnung ist, daß die gerade bei Vol­ last besonders hohe Stickoxidemission nicht gesenkt werden kann, da in diesem Betriebsbereich wegen der thermischen Belastung des Motors keine Abgasrückführung möglich ist. Außerdem ist die katalytische Beschichtung eines Partikel­ filters bei Rußbelegung weitgehend unwirksam.A disadvantage of this arrangement is that the Vol particularly high nitrogen oxide emissions cannot be reduced can, because in this operating area because of the thermal  Exhaust gas recirculation is not possible. It is also the catalytic coating of a particle Filters largely ineffective when used for soot.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Schadstoffemission des Dieselmotors im gesamten Betriebs­ bereich zu minimieren.The present invention is based on the object Emission of pollutants from the diesel engine throughout the company minimize area.

Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Durch die Rückführung ge­ kühlter Abgase ist auch bei Vollastbetrieb des Motors eine gewisse Abgasrückführung möglich ohne den Motor thermisch zu überlasten. Die dabei ansteigende Rußemission ist un­ kritisch, da der Ruß im Partikelfilter zurückgehalten wird und das rückgeführte Abgas gereinigt ist.The object is achieved by the characterizing Features of claim 1 solved. By the return ge Cooled exhaust gas is one even when the engine is operating at full load certain exhaust gas recirculation possible without the engine thermal to overload. The increasing soot emission is un critical because the soot is retained in the particle filter and the recirculated exhaust gas is cleaned.

Während die Abgasrückführung im gesamten Betriebsbereich der Dieselbrennkraftmaschine für eine Absenkung der Stick­ oxidemission sorgt, werden die unverbrannten Kohlenwasser­ stoffe und das Kohlenmonoxid durch einen Oxidationskataly­ sator beseitigt. Dessen Lage kurz hinter der Abgasturbine sichert durch die dort herrschende Temperatur seine Wirk­ samkeit bei schon relativ niedriger Last.During the exhaust gas recirculation in the entire operating area the diesel engine for lowering the stick oxide emissions, the unburned hydrocarbon substances and the carbon monoxide through an oxidation catalyst sator eliminated. Its location just behind the exhaust gas turbine ensures its effectiveness through the temperature prevailing there ease with a relatively low load.

Eine vorteilhafte Ausgestaltung der Erfindung gestattet eine freie Wahl der Abgasrückführmenge. Während bei höhe­ ren Lasten ein natürliches Druckgefälle zwischen der Ab­ gasleitung und der Verbrennungsluftleitung besteht, kann es bei Teillast notwendig werden, die Ansaugluft zu dros­ seln, um die gewünschte Abgasrückführmenge zu verwirkli­ chen. Die Drossel in der Abgasrückführleitung dient zur Begrenzung der Abgasrückführmenge bei höheren Lasten.An advantageous embodiment of the invention allows a free choice of the exhaust gas recirculation quantity. While at height loads a natural pressure drop between the Ab gas line and the combustion air line can at partial load it may be necessary to reduce the intake air select the desired amount of exhaust gas recirculation chen. The throttle in the exhaust gas recirculation line is used for Limitation of the exhaust gas recirculation quantity at higher loads.

Eine weitere vorteilhafte Ausbildung der Erfindung gestat­ tet das Partikelfilter auch während des Betriebes des Die­ selmotors zu regenerieren, um auf diese Weise einen konti­ nuierlichen Motorbetrieb zu gewährleisten. Another advantageous embodiment of the invention allows the particle filter also works during the operation of the die selmotors to regenerate in this way a continuous to ensure proper engine operation.  

Weitere Merkmale der Erfindung gehen aus der nachfolgenden Beschreibung und der Zeichnung hervor, in der ein Ausfüh­ rungsbeispiel der Erfindung schematisch dargestellt ist.Further features of the invention follow from the following Description and the drawing in which an exec Example of the invention is shown schematically.

Die Figur zeigt:
eine schematische Darstellung des Dieselmotors mit Abgasrückführung und Abgasnachbehandlungsanlage.The figure shows:
a schematic representation of the diesel engine with exhaust gas recirculation and exhaust gas aftertreatment system.

Der Dieselmotor 14 ist als 8-Zylinder V-Motor ausgebildet. Er ist über eine erste Abgasleitung 5 mit einer Abgastur­ bine 4 eines Turboladers 1 verbunden, die einen Lader 7 antreibt.The diesel engine 14 is designed as an 8-cylinder V-engine. It is connected via a first exhaust line 5 to an exhaust gas line 4 of a turbocharger 1 , which drives a charger 7 .

Nach Verlassen der Abgasturbine 4 strömen die Abgase durch einen Oxidationskatalysator 12, der in einer zweiten Ab­ gasleitung 6 kurz hinter der Abgasturbine 4 angeordnet ist. Danach gelangen die Abgase über eine Regenerations­ vorrichtung 13 in ein Partikelfilter 2. Diesem schließt sich eine dritte Abgasleitung 15 an, von der eine Abgas­ rückführleitung 3 abzweigt. In der Abgasrückführleitung 3 befindet sich ein Abgaskühler 10 und eine regelbare Dros­ sel 11.After leaving the exhaust gas turbine 4 , the exhaust gases flow through an oxidation catalytic converter 12 , which is arranged in a second gas line 6 just behind the exhaust gas turbine 4 . The exhaust gases then pass through a regeneration device 13 into a particle filter 2 . This is followed by a third exhaust line 15 , from which an exhaust gas recirculation line 3 branches off. In the exhaust gas recirculation line 3 there is an exhaust gas cooler 10 and an adjustable throttle sel 11th

Die Abgasrückführleitung 3 mündet in eine Ansaugluftlei­ tung 9, die den Lader 7 mit einem Luftfilter 16 verbindet. In der Ansaugluftleitung 9 befindet sich eine regelbare Drossel 11a. Der Lader 7 ist über eine Ladeluftleitung 8 und einen Ladeluftkühler 17 mit dem Dieselmotor 14 verbun­ den.The exhaust gas recirculation line 3 opens into a Ansaugluftlei device 9 , which connects the charger 7 with an air filter 16 . In the intake air line 9 there is an adjustable throttle 11 a. The charger 7 is connected via a charge air line 8 and a charge air cooler 17 to the diesel engine 14 .

Die Anlage funktioniert folgendermaßen:
Die heißen, ungereinigten Abgase des Dieselmotors 14 ge­ langen über die erste Abgasleitung 5 zur Abgasturbine 4, werden dort entspannt und strömen in den Oxidationskataly­ sator 12. Dort werden die nicht verbrannten Kohlenwasser­ stoffe und das Kohlenoxid oxidiert. Das so vorgereinigte Abgas strömt durch die zweite Abgasleitung 6 und die Rege­ nerationsvorrichtung 13 zum Partikelfilter 2. Dort werden die Rußpartikel ausgefiltert, so daß sich in der dritten Abgasleitung 15 gereinigtes Abgas befindet. Von der drit­ ten Abgasleitung 15 strömt das gereinigte Abgas durch die Abgasrückführleitung 3 zum Abgaskühler 10, wo es gekühlt wird. Die über die regelbare Drossel 11 dosierte Abgas­ rückführmenge gelangt in die vom Luftfilter 16 zum Lader 7 führende Ansaugluftleitung 9. In der Ansaugluftleitung 9 wird bei Teillast der zur Förderung der Abgasrückführmenge erforderliche Unterdruck mit der regelbaren Ansaugluft­ drossel 11a erzeugt. Die Drosseln 11, 11a dienen zum Steu­ ern einer optimalen Rückführmenge im gesamten Betriebsbe­ reich des Dieselmotors. Dazu können bekannte elektronische Steuermittel verwendet werden. Die Ladeluft vermischt mit der rückgeführten Abgasmenge gelangt über den Lader 7, die Ladeluftleitung 8 und den Ladeluftkühler 17 zum Dieselmo­ tor 14.The system works as follows:
The hot, uncleaned exhaust gases of the diesel engine 14 ge long via the first exhaust line 5 to the exhaust gas turbine 4 , are relaxed there and flow into the oxidation catalyst 12th There the unburned hydrocarbons and the carbon oxide are oxidized. The exhaust gas thus pre-cleaned flows through the second exhaust line 6 and the regeneration device 13 to the particle filter 2 . There, the soot particles are filtered out so that there is cleaned exhaust gas 15 in the third exhaust line. From the third exhaust gas line 15 , the cleaned exhaust gas flows through the exhaust gas recirculation line 3 to the exhaust gas cooler 10 , where it is cooled. The exhaust gas recirculation quantity metered via the controllable throttle 11 reaches the intake air line 9 leading from the air filter 16 to the charger 7 . In the intake air line 9 , the vacuum required to promote the exhaust gas recirculation quantity is generated with the controllable intake air throttle 11 a at partial load. The throttles 11 , 11 a serve to control an optimal return quantity in the entire operating range of the diesel engine. Known electronic control means can be used for this. The charge air mixed with the recirculated exhaust gas quantity passes through the charger 7 , the charge air line 8 and the charge air cooler 17 to the diesel engine 14 .

Das gereinigte Abgas in der Ladeluft bewirkt eine Absen­ kung der Stickoxidemission ohne den Verschleiß des Diesel­ motors zu erhöhen. Durch die Rückführung gekühlten Abgases ist eine Abgasrückführung auch bei hohen Lasten möglich, die zur Absenkung der dann besonders hohen Stickoxidemis­ sion führt. Die Anordnung des Oxidationskatalysators kurz hinter der Abgasturbine macht diesen schon bei niedrigen Lasten wirksam. Auf diese Weise wird im gesamten Betriebs­ bereich des Motors eine weitgehende Abgasreinigung er­ reicht. Die Regenerationsvorrichtung 13 gestattet eine vollautomatische Regeneration des Partikelfilters 2 wäh­ rend des Betriebes des Dieselmotors. Das saubere rückge­ führte Abgas verschmutzt weder den Abgaskühler 10, noch erhöht es den Motorverschleiß. Der Oxidationskatalysator 12 ist gegen partikelbeladene Abgase unempfindlich und be­ hält seine Wirksamkeit über lange Zeit. Aufgrund dieser Tatsachen erfüllt die Anlage die strengen Auflagen der TA-Luft im Dauerbetrieb.The cleaned exhaust gas in the charge air causes a reduction in nitrogen oxide emissions without increasing the wear on the diesel engine. The recirculation of cooled exhaust gas enables exhaust gas recirculation even at high loads, which leads to a reduction in the particularly high nitrogen oxide emission. The arrangement of the oxidation catalytic converter just behind the exhaust gas turbine makes it effective even at low loads. In this way, extensive exhaust gas cleaning is sufficient in the entire operating range of the engine. The regeneration device 13 allows a fully automatic regeneration of the particle filter 2 during operation of the diesel engine. The clean recirculated exhaust gas does not contaminate the exhaust gas cooler 10 , nor does it increase engine wear. The oxidation catalyst 12 is insensitive to particle-laden exhaust gases and be effective for a long time. Based on these facts, the system meets the strict requirements of TA-Luft in continuous operation.

Claims (6)

1. Dieselmotor mit einer Abgasleitung (5, 6), in der eine Abgastur­ bine (4) eines Abgasturboladers (1) und ein Partikelfilter (2) angeord­ net sind und mit einer Verbrennungsluftleitung (8, 9), in der ein Lader (7) des Abgasturboladers (1) vorgesehen ist, sowie mit einer Abgas­ rückführleitung (3), die in Strömungsrichtung hinter dem Partikelfilter (2) von der Abgasleitung (5, 6) abzweigt und diese mit der Verbren­ nungsluftleitung (8, 9) verbindet, dadurch gekennzeichnet, daß in Strömungsrichtung hinter der Ab­ gasturbine (4) ein Oxidationskatalysator (12) und hinter diesem das Partikelfilter (2) in der Abgasleitung (6) angeordnet sind und daß in der Abgasrückführleitung (3) ein Abgaskühler (10) vorgesehen ist.1. Diesel engine with an exhaust pipe ( 5 , 6 ), in which an exhaust gas line ( 4 ) of an exhaust gas turbocharger ( 1 ) and a particle filter ( 2 ) are arranged and with a combustion air line ( 8 , 9 ) in which a charger ( 7 ) of the exhaust gas turbocharger ( 1 ) is provided, and with an exhaust gas recirculation line ( 3 ), which branches off in the flow direction behind the particle filter ( 2 ) from the exhaust line ( 5 , 6 ) and connects it to the combustion air line ( 8 , 9 ), thereby characterized in that in the flow direction behind the gas turbine ( 4 ) an oxidation catalyst ( 12 ) and behind this the particle filter ( 2 ) are arranged in the exhaust line ( 6 ) and that in the exhaust gas recirculation line ( 3 ) an exhaust gas cooler ( 10 ) is provided. 2. Dieselmotor nach Anspruch 1, dadurch gekennzeichnet, daß in der Verbrennungsluftleitung (8, 9) in Strömungsrichtung vor der Einmündung der Abgasrückführleitung (3) und in der Abgasrückführleitung (3) Drosseln (11, 11a) angeordnet sind, die im gesamten Betriebsbereich des Dieselmotors regelbar sind.2. Diesel engine according to claim 1, characterized in that in the combustion air line ( 8 , 9 ) in the flow direction before the confluence of the exhaust gas recirculation line ( 3 ) and in the exhaust gas recirculation line ( 3 ) throttles ( 11 , 11 a) are arranged, which are in the entire operating range of the diesel engine are adjustable. 3. Dieselmotor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß dem Partikelfilter (2) eine Regenera­ tionsvorrichtung (13) zugeordnet ist, wobei die Regenerationsvorrich­ tung (13) während des Betriebes des Dieselmotors betreibbar ist. 3. A diesel engine according to claim 1 or 2, characterized in that the particle filter (2) has a regenerator tion device is associated (13), wherein the Regenerationsvorrich device (13) during operation of the diesel engine is operated. 4. Verfahren zum Betreiben eines Dieselmotors mit einer Abgaslei­ tung (5, 6). in der eine Abgasturbine (4) eines Abgasturboladers (1) und ein Partikelfilter (2) angeordnet sind und mit einer Verbrennungs­ luftleitung (8, 9), in der ein Lader (7) des Abgasturboladers (1) vorge­ sehen ist, sowie mit einer Abgasrückführleitung (3), die in Strö­ mungsrichtung hinter dem Partikelfilter (2) von der Abgasleitung (5, 6) abzweigt und diese mit der Verbrennungsluftleitung (8, 9) verbindet, dadurch gekennzeichnet, daß das Abgas durch einen in Strömungs­ richtung hinter der Abgasturbine (4) in der Abgasleitung (6) angeord­ neten Oxidationskatalysator (12) und dem hinter diesem angeordne­ ten Partikelfilter (2) geleitet wird und daß bei allen Betriebszuständen des Dieselmotors Abgas durch die Abgasrückführleitung (3) zurück­ führbar ist, wobei in der Abgasrückführleitung (3) ein Abgaskühler (10) vorgesehen ist.4. A method for operating a diesel engine with an exhaust line ( 5 , 6 ). in which an exhaust gas turbine ( 4 ) of an exhaust gas turbocharger ( 1 ) and a particle filter ( 2 ) are arranged and with a combustion air line ( 8 , 9 ), in which a charger ( 7 ) of the exhaust gas turbocharger ( 1 ) is provided, and with a Exhaust gas recirculation line ( 3 ), which branches off in the flow direction behind the particle filter ( 2 ) from the exhaust line ( 5 , 6 ) and connects it to the combustion air line ( 8 , 9 ), characterized in that the exhaust gas is flowed through in a flow direction behind the exhaust gas turbine ( 4 ) in the exhaust pipe ( 6 ) is arranged NEN oxidation catalyst ( 12 ) and the particle filter ( 2 ) arranged behind it and that exhaust gas can be returned through the exhaust gas recirculation line ( 3 ) in all operating states of the diesel engine, whereby in the exhaust gas recirculation line ( 3 ) an exhaust gas cooler ( 10 ) is provided. 5. Verfahren zum Betreiben eines Dieselmotor nach Anspruch 4, dadurch gekennzeichnet, daß in der Verbrennungsluftleitung (8, 9) in Strömungsrichtung vor der Einmündung der Abgasrückführleitung (3) und in der Abgasrückführleitung (3) Drosseln (11, 11a) angeordnet sind, die im gesamten Betriebsbereich des Dieselmotors regelbar sind.5. A method of operating a diesel engine according to claim 4, characterized in that in the combustion air line ( 8 , 9 ) in the flow direction before the confluence of the exhaust gas recirculation line ( 3 ) and in the exhaust gas recirculation line ( 3 ) throttles ( 11 , 11 a) are arranged, which can be regulated in the entire operating range of the diesel engine. 6. Verfahren zum Betreiben eines Dieselmotor nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß dem Partikelfilter (2) eine Regenera­ tionsvorrichtung (13) zugeordnet ist, wobei die Regenerationsvorrich­ tung (13) während des Betriebes des Dieselmotors betreibbar ist.6. A method for operating a diesel engine according to claim 4 or 5, characterized in that the particle filter (2) is a regenerator tion device is associated (13), wherein the Regenerationsvorrich device (13) during operation of the diesel engine operable.
DE4007516A 1990-03-09 1990-03-09 Diesel engine Expired - Fee Related DE4007516C2 (en)

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