DE4327086C1 - Method for the cleaning of particle filters - Google Patents

Method for the cleaning of particle filters

Info

Publication number
DE4327086C1
DE4327086C1 DE4327086A DE4327086A DE4327086C1 DE 4327086 C1 DE4327086 C1 DE 4327086C1 DE 4327086 A DE4327086 A DE 4327086A DE 4327086 A DE4327086 A DE 4327086A DE 4327086 C1 DE4327086 C1 DE 4327086C1
Authority
DE
Germany
Prior art keywords
exhaust gas
fuel
cleaning
cylinders
main injection
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.)
Expired - Lifetime
Application number
DE4327086A
Other languages
German (de)
Inventor
Ralph-Michael Dr Schmidt
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.)
Mercedes Benz Group AG
Original Assignee
MTU Friedrichshafen GmbH
MTU Motoren und Turbinen Union Friedrichshafen GmbH
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 MTU Friedrichshafen GmbH, MTU Motoren und Turbinen Union Friedrichshafen GmbH filed Critical MTU Friedrichshafen GmbH
Priority to DE4327086A priority Critical patent/DE4327086C1/en
Application granted granted Critical
Publication of DE4327086C1 publication Critical patent/DE4327086C1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/405—Multiple injections with post injections
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • 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
    • 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
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The invention relates to a method for the cleaning of particle filters in exhaust ducts of diesel engines, an additional quantity of fuel being injected into the cylinders after the main injection, just prior to opening of the exhaust valves.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Reinigung von Parti­ kelfiltern gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for cleaning parti kelfilter according to the preamble of claim 1.

Partikelfilter in Auspuffsystemen von Dieselmotoren dienen zum Aus­ scheiden von Ruß und kondensierbaren Bestandteilen aus dem Abgasstrom in das Filtermaterial. Mit zunehmender Betriebsdauer der Dieselmotoren lagern sich mehr Bestandteile im Filtermaterial ab, das Partikelfilter verstopft und der Abgasgegendruck steigt unzulässig an.Particulate filters in exhaust systems of diesel engines are used for exhaust separate soot and condensable components from the exhaust gas flow into the filter material. With increasing service life of the diesel engines more particles are deposited in the filter material, the particle filter clogged and the exhaust gas back pressure rises inadmissibly.

Um das Verstopfen von Partikelfiltern zu verhindern, ist es aus der DE-PS 38 17 980 bekannt, Filtermaterial durch Aufheizen und Abbrennen der gefilterten Bestandteile zu reinigen. Einer ersten Zylindergruppe wird zusätzlicher Kraftstoff, und einer zweiten Zylindergruppe dieser Brennkraftmaschine weniger Kraftstoff zugeführt, wobei außerhalb der Regenerationsphase beide Zylindergruppen und während der Regenera­ tionsphase die erste Zylindergruppe mit dem Rußabbrennfilter verbunden sind. Die Ansaugluft zur zweiten Zylindergruppe kann in der Regenera­ tionsphase gedrosselt werden. To prevent the clogging of particle filters, it is out of the DE-PS 38 17 980 known filter material by heating and burning of the filtered components. A first group of cylinders becomes additional fuel, and a second cylinder group this Internal combustion engine supplied less fuel, being outside of Regeneration phase both cylinder groups and during the regeneration tion phase, the first cylinder group is connected to the soot burning filter are. The intake air to the second cylinder group can be in the Regenera tion phase are throttled.  

Ein Nachteil dieser Vorrichtung besteht darin, daß getrennte Saugluft- und Abgasführungen und eine zusätzliche Drosseleinrichtung in der Saugluftführung für die zweite Zylindergruppe die Brennkraftmaschine verteuern.A disadvantage of this device is that separate suction air and exhaust ducts and an additional throttle device in the Suction air routing for the second cylinder group the internal combustion engine make it more expensive.

Aus dem Patent-Abstract JP 59-68 512 (A); M-316 ist eine Kraftstoff­ versorgungseinrichtung an einer Verteilerpumpe bekannt, mit der am Ende der Haupteinspritzung ein Teil des Hochdruckkraftstoffs abge­ zweigt und in einem Einspritzventil eines anderen Zylinders zugeführt werden kann, um am Ende des Expansionstaktes oder während des Aus­ pufftaktes die Temperatur zu erhöhen.From patent abstract JP 59-68 512 (A); M-316 is a fuel Supply device known to a distributor pump, with the Part of the high pressure fuel removed at the end of the main injection branches and fed into an injection valve of another cylinder can be to at the end of the expansion clock or during the off pufftaktes to raise the temperature.

Auch diese vorbekannte Vorrichtung verlangt zusätzlichen Bauaufwand, der die Verteilerpumpe verteuert, wobei zusätzlich der Nachteil in Kauf genommen wird, daß der Einspritzzeitpunkt der zusätzlichen Kraft­ stoffmenge nicht völlig frei wählbar ist.This previously known device also requires additional construction costs, which makes the distributor pump more expensive, with the additional disadvantage of Purchase is made that the time of injection of the additional force amount of substance is not completely freely selectable.

Aufgabe der Erfindung ist es, ein Verfahren zur Reinigung von Parti­ kelfiltern für Dieselmotoren derart auszugestalten, daß auf getrennte Saugluft- und Abgasführungen und zusätzliche Drosseleinrichtungen ver­ zichtet werden kann.The object of the invention is a method for cleaning parti to design kelfilters for diesel engines so that on separate Suction air and exhaust gas ducts and additional throttling devices ver can be waived.

Die Lösung dieser Aufgabe erfolgt mit einem Verfahren zur Reinigung von Partikelfiltern mit den Merkmalen des Anspruchs 1.This problem is solved with a cleaning process of particle filters with the features of claim 1.

Bei Dieselmotoren gemäß der Erfindung ist allen Zylindern ein gemein­ sames Partikelfilter zugeordnet. Wird z. B. während des Betriebs des Dieselmotors durch eine Abgasgegendruckmessung festgestellt, daß das Partikelfilter gereinigt werden muß, wird in alle Zylinder nach der Haupteinspritzung, gegen Ende der eigentlichen Verbrennungsphase, eine geringe Kraftstoffmenge eingespritzt. Kraftstoff, der in dieser Hoch­ druckphase verbrannt wird, bewirkt eine signifikante Erhöhung der Tem­ peratur auf mehr als 550°C im Abgas, die ausreicht, den im Partikel­ filter gesammelten Ruß abzubrennen. In diesel engines according to the invention, all cylinders have one thing in common associated particle filter. Is z. B. during the operation of the Diesel engine determined by an exhaust gas back pressure measurement that the Particulate filter must be cleaned in all cylinders after the Main injection, towards the end of the actual combustion phase, one small amount of fuel injected. Fuel that in this high pressure phase is burned, causes a significant increase in the tem temperature to more than 550 ° C in the exhaust gas, which is sufficient in the particle Burn off the collected soot.  

Die erfindungsgemäße Nacheinspritzung erfordert keine konstruktiven Änderungen am Dieselmotor, da die zusätzliche Kraftstoffmenge über die regulären Einspritzdüsen den Zylindern zugeführt wird. Die zusätzliche Kraftstoffmenge wird gegen Ende der eigentlichen Verbrennungsphase kurz vor Öffnen der Auslaßventile der Zylinder eingespritzt. Der Bei­ trag der zusätzlichen Kraftstoffmenge zur inneren Arbeit des Diesel­ motors ist gering, wohingegen die Temperatur des Abgases signifikant über das normale Niveau hinaus erhöht wird.The post-injection according to the invention does not require any design Changes to the diesel engine because the additional amount of fuel over the regular injectors are fed to the cylinders. The additional The amount of fuel is towards the end of the actual combustion phase injected shortly before opening the exhaust valves of the cylinders. The case the amount of fuel added to the internal work of the diesel engines is low, whereas the temperature of the exhaust gas is significant is raised above the normal level.

Gemäß einer vorteilhaften Ausgestaltung des erfindungsgemäßen Ver­ fahrens wird Kraftstoff von 20-30%, vorzugsweise ca. 25%, der Menge der Haupteinspritzung zusätzlich in die Zylinder nachgespritzt, wodurch die Abgastemperatur um 200°C über die normale Verbrennungstemperatur auf ein für thermische Regeneration ausreichendes Niveau angehoben werden kann.According to an advantageous embodiment of the Ver driving is fuel of 20-30%, preferably about 25%, of the amount of Main injection additionally injected into the cylinder, whereby the exhaust gas temperature is 200 ° C above the normal combustion temperature raised to a level sufficient for thermal regeneration can be.

Mit dieser Temperaturerhöhung von 200°C erreicht die Abgastemperatur Werte über 550°C, so daß der Ruß im Partikelfilter verbrennt. Das nach dem Abbrennen vom Ruß gereinigte Partikelfilter kann wieder neuen Ruß aus dem durchströmenden Abgas aufnehmen, ohne das Abgas beim Durch­ strömen mit zu großem Widerstand zu hindern.With this temperature increase of 200 ° C the exhaust gas temperature reaches Values above 550 ° C, so that the soot burns in the particle filter. That after The particulate filter cleaned after burning off soot can again produce new soot from the exhaust gas flowing through, without the exhaust gas when passing through to prevent flow with too much resistance.

Claims (2)

1. Verfahren zur Reinigung von Partikelfiltern in einer Abgasführung von Dieselmotoren, bei dem Kraftstoff während einer Haupteinsprit­ zung in den Zylindern des Dieselmotors verbrannt, Abgas durch ei­ nen in der Abgasführung enthaltenen Partikelfilter geleitet, Ruß aus dem Abgas in den Partikelfilter ausgefiltert, Druck in der Abgasführung vor dem Partikelfilter gemessen, und bei Erreichen eines bestimmten Druckwerts in der Abgasführung ein Signal an eine Einspritzanlage gegeben wird, gekennzeichnet durch Einspritzen einer zusätzlichen Menge Kraftstoffs durch die regulären Ein­ spritzdüsen zeitlich nach der Haupteinspritzung und kurz vor Öff­ nen der Auslaßventile der Zylinder. 1. A method for cleaning particle filters in an exhaust gas duct of diesel engines, in which fuel is burned during a main injection in the cylinders of the diesel engine, exhaust gas is passed through a particle filter contained in the exhaust gas duct, soot is filtered out of the exhaust gas into the particle filter, pressure in the Exhaust gas routing measured in front of the particle filter, and when a certain pressure value in the exhaust gas routing is reached, a signal is given to an injection system, characterized by injecting an additional amount of fuel through the regular injection nozzles at a time after the main injection and shortly before opening the exhaust valves of the cylinders. 2. Verfahren zur Reinigung von Partikelfiltern gemäß Anspruch 1, da­ durch gekennzeichnet, daß die zusätzliche Menge Kraftstoff 20-30%, insbesondere ca. 25% der Menge des Kraftstoffs für die Haupteinspritzung ist.2. A method for cleaning particle filters according to claim 1, because characterized in that the additional amount of fuel 20-30%, especially about 25% of the amount of fuel for the Main injection is.
DE4327086A 1993-08-12 1993-08-12 Method for the cleaning of particle filters Expired - Lifetime DE4327086C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4327086A DE4327086C1 (en) 1993-08-12 1993-08-12 Method for the cleaning of particle filters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4327086A DE4327086C1 (en) 1993-08-12 1993-08-12 Method for the cleaning of particle filters

Publications (1)

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DE4327086C1 true DE4327086C1 (en) 1995-02-16

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19952830A1 (en) * 1999-11-02 2001-05-03 Audi Ag Process for exhaust gas aftertreatment by post-injection of fuel in a diesel internal combustion engine with a pre-catalytic converter and particle filter
DE19959605A1 (en) * 1999-12-10 2001-06-13 Volkswagen Ag Device and method for NOx and / or SOx regeneration of a NOx storage catalytic converter
EP1170473A1 (en) 2000-07-07 2002-01-09 DaimlerChrysler AG Internal combustion engine, especially for vehicles
GB2421546A (en) * 2004-12-22 2006-06-28 Detroit Diesel Corp Method for the regeneration of a particulate filter connected to an i.c. engine including enriching the charge supplied to the engine
US7225610B2 (en) 2004-06-30 2007-06-05 Daimlerchrysler Ag Process for operating a combustion engine
DE19622832B4 (en) * 1995-06-07 2007-10-04 Caterpillar Inc., Peoria Emission cleaning system and method for reducing internal combustion engine emissions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968512A (en) * 1982-10-09 1984-04-18 Diesel Kiki Co Ltd Fuel supplying device by distributing type fuel injection pump for treatment of fine particle in exhaust gas of internal-combustion engine
DE3817980C2 (en) * 1988-05-27 1990-10-25 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968512A (en) * 1982-10-09 1984-04-18 Diesel Kiki Co Ltd Fuel supplying device by distributing type fuel injection pump for treatment of fine particle in exhaust gas of internal-combustion engine
DE3817980C2 (en) * 1988-05-27 1990-10-25 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19622832B4 (en) * 1995-06-07 2007-10-04 Caterpillar Inc., Peoria Emission cleaning system and method for reducing internal combustion engine emissions
DE19952830A1 (en) * 1999-11-02 2001-05-03 Audi Ag Process for exhaust gas aftertreatment by post-injection of fuel in a diesel internal combustion engine with a pre-catalytic converter and particle filter
US6971230B1 (en) 1999-11-02 2005-12-06 Audi Ag Method for the post-treatment of exhaust gases by subsequent injection of fuel in a diesel-type internal combustion engine provided with a pre-catalyst and a particle filter
DE19959605A1 (en) * 1999-12-10 2001-06-13 Volkswagen Ag Device and method for NOx and / or SOx regeneration of a NOx storage catalytic converter
EP1170473A1 (en) 2000-07-07 2002-01-09 DaimlerChrysler AG Internal combustion engine, especially for vehicles
EP1170473B1 (en) * 2000-07-07 2009-10-14 Daimler AG Method of operating a combustion engine
US7225610B2 (en) 2004-06-30 2007-06-05 Daimlerchrysler Ag Process for operating a combustion engine
DE102004031502B4 (en) * 2004-06-30 2013-12-05 Daimler Ag Method for operating an internal combustion engine
GB2421546A (en) * 2004-12-22 2006-06-28 Detroit Diesel Corp Method for the regeneration of a particulate filter connected to an i.c. engine including enriching the charge supplied to the engine
US7434388B2 (en) 2004-12-22 2008-10-14 Detroit Diesel Corporation Method and system for regeneration of a particulate filter

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Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: MTU FRIEDRICHSHAFEN GMBH, 88045 FRIEDRICHSHAFEN, D

8327 Change in the person/name/address of the patent owner

Owner name: DAIMLERCHRYSLER AG, 70567 STUTTGART, DE

8327 Change in the person/name/address of the patent owner

Owner name: DAIMLERCHRYSLER AG, 70327 STUTTGART, DE

8327 Change in the person/name/address of the patent owner

Owner name: DAIMLER AG, 70327 STUTTGART, DE

R071 Expiry of right
R071 Expiry of right