DE3420199A1 - Method for controlling the combustion of the soot contained in the exhaust gas from internal combustion engines - Google Patents

Method for controlling the combustion of the soot contained in the exhaust gas from internal combustion engines

Info

Publication number
DE3420199A1
DE3420199A1 DE19843420199 DE3420199A DE3420199A1 DE 3420199 A1 DE3420199 A1 DE 3420199A1 DE 19843420199 DE19843420199 DE 19843420199 DE 3420199 A DE3420199 A DE 3420199A DE 3420199 A1 DE3420199 A1 DE 3420199A1
Authority
DE
Germany
Prior art keywords
exhaust gas
additives
addition
pressure loss
filter
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.)
Granted
Application number
DE19843420199
Other languages
German (de)
Other versions
DE3420199C2 (en
Inventor
Dietrich Dipl.-Ing. 7123 Sachsenheim Lenzen
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.)
Daimler Benz AG
Original Assignee
Knecht Filterwerke 7000 Stuttgart GmbH
Knecht Filterwerk 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 Knecht Filterwerke 7000 Stuttgart GmbH, Knecht Filterwerk GmbH filed Critical Knecht Filterwerke 7000 Stuttgart GmbH
Priority to DE19843420199 priority Critical patent/DE3420199A1/en
Publication of DE3420199A1 publication Critical patent/DE3420199A1/en
Application granted granted Critical
Publication of DE3420199C2 publication Critical patent/DE3420199C2/de
Granted 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
    • F01N3/02—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
    • F01N3/029—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 by adding non-fuel substances to exhaust
    • F01N3/0293—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 by adding non-fuel substances to exhaust injecting substances in exhaust stream
    • 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
    • F01N3/029—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 by adding non-fuel substances to exhaust
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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

Abstract

In a method for cleaning the exhaust gases from internal combustion engines by burning off the soot filtered out, the burn-off temperature, as is known, can be reduced by the addition of catalytic additives to the exhaust gas and/or to the fuel producing the exhaust gas. In order to add the additives only when burning off is desirable by virtue of a certain level of deposits, the addition of the additives is controlled as a function of pressure losses in the exhaust filter which are dependent upon the engine speed. In addition, the volumetric flow of additives to be added is also undertaken as a function of the engine speed. <IMAGE>

Description

Verfahren zur Rege ung der Verbrennung des in dem Abgas von Verbrennungcimotoren enthaltenen Rußes Die Erfindung betrifft bei der Abgasreinigung von Verbrennungsmotoren ein Verfahren zur Regelung der Zugabe von katalytisch wirkenden Additiven in den Kraftstoff des Verbrennungsmotors zur Beeinflussung der Verbrennung von in einem Filter aus dem Motorabgas abgetrenntem Ruß. Process for regulating the combustion of the in the exhaust gas from internal combustion engines contained soot The invention relates to the exhaust gas cleaning of internal combustion engines a method for regulating the addition of catalytically active additives in the Fuel of the internal combustion engine to influence the combustion of in one Filter soot separated from engine exhaust.

Das Hinzufügen von katalytisch wirkenden Additiven entweder in das noch unbehandelte Abgas oder bereits in den @m Motor zu verbrennenden Krattstoff ist an sich bekannt.Adding catalytically active additives to either the exhaust gas that has not yet been treated or fuel already to be burned in the engine is known per se.

Die DE 31 11 228 Al beschreibt bereits ein Verfahren, bei dem solche Additive dem Abgas erst und nur dann zugegeben werden, wenn in dem Abgasfilter ein vorbestimmter Durchfluß-Widerstand überschritten wird und auch die Temperatur in dem Abgasfilter oberhalb einer vorbestimmten Temperatur liegt, bei der unter Einwirkung der zugegebenen Additive auch tatsächlich ein Abbrennen des Rußes erfolgt.DE 31 11 228 Al already describes a method in which such Additives are only added to the exhaust gas if and only if one is in the exhaust gas filter predetermined flow resistance is exceeded and the temperature in the exhaust filter is above a predetermined temperature at which under action The added additives actually burn off the soot.

Das zuletzt beschriebene Verfahren hat allerdings den Nachteil, daß eine Additivzugabe unabhängig von der Drehzahl des Motors und damit dem Anfall an Abgas immer erst bei Überschreiten eines für den oberen Drehzahlbereich ausgelegten Maximaldurchflußwiderstandes erfolgt. Da andererseits der Druckverlust bei einem von Ablagerungen völlig freien Filter bei niedrigen Motordrehzahlen wesentlich geringer als bei höheren Drehzahlen ist, führt dies dazu, daß bei einem zunächst bei niedrigen Motordrehzahlen laufenden Motor eine Additivzugabe erst dann erfolgt, wenn der für den oberen Drehzahlbereich ausgelegte Druckverlust erreicht l;t. I)ie. e führt ir, der F> ra x dazu daß bei Übergang von niedrigen zu höheren Drehzahlen ein erhebliches kurzzeitiges Überschreiten des zulässigen Druckverlustes hingenommen werden muß.The last-described method, however, has the disadvantage that an additive addition regardless of the speed of the Motors and with it the accumulation of exhaust gas only when one for the upper speed range is exceeded designed maximum flow resistance takes place. On the other hand, there is the pressure loss with a filter completely free of deposits at low engine speeds is lower than at higher speeds, this leads to the fact that at a first When the engine is running at low engine speeds, an additive is only added when the pressure loss designed for the upper speed range reaches l; t. I) ie. e leads ir, the F> ra x to the fact that when changing from low to higher speeds accepted a considerable short-term exceeding of the permissible pressure loss must become.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, die Zugabe der Additive so zu regeln, daß bei niedrigen Drehzahlen bis zur Zugabe von Additiven ein kleinerer Druckverlust infolge Rußablagerungen zugelassen wird als bei höheren Drehzahlen.Proceeding from this, the invention is based on the object of adding to regulate the additives so that at low speeds up to the addition of additives a smaller pressure loss due to soot deposits is permitted than with higher ones Speeds.

Gelost wird diese Aufgabe durch eine Zugabe nach den Verfahrrnsmerkmalen des kennzeichnenden teils des Anspruchs 1.This task is solved by adding an allowance according to the process characteristics the characterizing part of claim 1.

Zweckmäßigerweise erfolgt die Mengenstrombemessung für die zuzugebenden Additive ebenfalls in Abhängigkeit der Motordrehzahl, d. h. mit zunehmender Drehzahl und damit verbundenem höheren Abgasmengenstrom wird die Additivzugabe entsprechend erhöht.The flow rate measurement is expediently carried out for the to be added Additives also depending on the engine speed, i. H. with increasing speed and the associated higher flow of exhaust gas, the addition of additives will be appropriate elevated.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt und zwar zeigen r ig. 1 ein Diagramm des Abgasdruckverlustes im Filter in Abhängigkeit der Motordrehzahl Fig. 2 ein Blockschaltbild des erfindungsgemäßen Regelverfahrens.An exemplary embodiment is shown in the drawing show r ig. 1 shows a diagram of the exhaust gas pressure loss in the filter as a function of the Motor speed Fig. 2 is a block diagram of the control method according to the invention.

In dem Diagramm nach Fig. 1 zeigt die Kurve A den Druckverlust über der Motordrehzahl bei einem Filter ohne Rußablagerungen. Die Kurve B ist eine beliebig vorgebbare Grenzkurve für den Druckverlust, der bei den einzelnen Motordrehzahlen noch ohne Zugabe von Additiven hingenommen werden soll. Der vorgegebene Verlauf der Grenzkurve B erfolgt unter der Maßgabe, daß bei kleiner Motordrehzahl der Druckverlust durch Rußablaqerunqen gerade so qroß werden darf, daß bei einer plötzlicherl Steigerun(l der (7) t ( r ti r I)rehzahl auf höhere Werte der bei einer vnrbestimmterl höheren Drehzahl festgelegte maximal zulässige Druckverlust noch nicht überschritten wird.In the diagram according to FIG. 1, curve A shows the pressure loss over the engine speed with a filter without soot deposits. The curve B is arbitrary specifiable limit curve for the pressure loss at the individual engine speeds should be accepted without the addition of additives. The given course the limit curve B takes place under the proviso that the pressure loss at low engine speed by soot deposition it may become just so large that in the event of a sudden increase (l the (7) t (r ti r I) speed to higher values than at a certain higher Speed specified maximum permissible pressure loss is not yet exceeded.

Nach dem in Fig. 2 dargestellten Blockschaltbild erfolgt die Regelung der Additive in den Brennstoff auf folgende Weise.The control takes place according to the block diagram shown in FIG the additives in the fuel in the following way.

An dem Abgasfilter 1 wird der Abgasdruckverlust ermittelt und in einem Druckumwandler 2 in ein elektrisches Signal überführt. Von dem Motor wird über einen Frequenz-Spannungs-Wandler 3 die Drehzahl in Form eines elektrischen Signales ermittelt. Die Signale aus den Wandlern 2 und 3 werden einem Vergleicher 4 zugeführt. in diesem Vergleicher wird die in Fig. 1 dargestellte Kurve B ermittelt und festgestellt, ob der Druckverlust in dem Abgas filter 1 ober- oder noch unterhalb dieser Kurve liegt. Liegt er oberhalb der genannten Kurve, so wird auf ein Stellglied 5 ein Signal zur Förderung von Additiven aus einem Tank 6 in die Kraftstoffzuführleitung 7 vor der Einspritzpumpe 8 ausgelöst. Die Menge der zuzuführenden Additive wird durch einen Taktgeber 9 bestimmt, der seine Impulse von einem Drehzahlgeber 10 des Verbrennungsmotors erhält. Der Taktgeber 9 beeinflußt die Mengenzugabe in der Weise, daß die Zugabemenge pro Zeiteinheit bzw. die Zeitabstände bei intermittierend zugegebenen gleichgroßen Mengen mit steigender Drehzahl entsprechend zunehmen. Eine Zugabe von Additiven erfolgt durch das Stellglied 5 allerdings erst und nur dann, wenn die im Punkt 11 vor dem Abgasfilter 1 gemessene und als Signal 12 dem Stellglied zugeführte Abgastemperatur einen Mindestwert überschritten hat, bei dem je nach Art der zugegebenen Additive ein Ruß-Abbrennen erfolgen kann.The exhaust gas pressure loss is determined on the exhaust gas filter 1 and in one Pressure transducer 2 converted into an electrical signal. The engine has a Frequency-voltage converter 3 determines the speed in the form of an electrical signal. The signals from the converters 2 and 3 are fed to a comparator 4. in this Comparator the curve B shown in Fig. 1 is determined and determined, whether the pressure loss in the exhaust filter 1 above or below this curve lies. If it is above the curve mentioned, a signal is sent to an actuator 5 for conveying additives from a tank 6 into the fuel supply line 7 the injection pump 8 triggered. The amount of additives to be added is determined by a clock 9 determines its pulses from a speed sensor 10 of the internal combustion engine receives. The clock 9 influences the amount added in such a way that the amount added per unit of time or the time intervals with intermittently added equal amounts Quantities increase accordingly with increasing speed. An addition of additives takes place by the actuator 5, however only and only if that measured at point 11 upstream of the exhaust filter 1 and sent as a signal 12 to the actuator supplied exhaust gas temperature has exceeded a minimum value at which, depending on Type of additives added a soot burn-off can take place.

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Claims (2)

Ansprüche 1. Verfahren zur Regelung der Zugabe von katalytisch wirkenden Additiven in den Kraftstoff von Verbrennungsmotoren zur Beeinflussung der Verbrennung von in einem Filter aus dem Motor-Abgas abgetrenntem Ruß, dadurch g e k e n n z e i c h n e t daß die Zugabe nur erfolgt, a) oberhalb einer bestimmten vorgegebenen Temperatur des Abgases und b) bei einem Druckverlust des Abgases in dem Filter oberhalb eines von der Motordrehzahl abhängigen Wertes K = f(n) + a (n) S wobei (n) eine Funktion ds Druckverlustes bei einem Abgclsfilter ohne Ablagerungen in Abhängigkeit der Motordrehzahl ist und a (n) den bei den einzelnen Motordrehzahlen durch Ablagerung z uz ul assenden Maximal-Zusatzdruckverlust, bis zu dem noch keine Additivzugabe erfolgen soll, angibt. Claims 1. A method for regulating the addition of catalytically active Additives in the fuel of internal combustion engines to influence the combustion of soot separated from the engine exhaust gas in a filter, thereby g e k e n n z e i c h e t that the addition only takes place a) above a certain predetermined value Temperature of the exhaust gas and b) in the event of a pressure loss of the exhaust gas in the filter above a value dependent on the engine speed K = f (n) + a (n) S where (n) a The function of the pressure loss in an exhaust filter without deposits is dependent is the engine speed and a (n) the at the individual engine speeds by deposit Maximum additional pressure loss to be used, up to which no additive has yet to be added should take place, indicates. 2. Verfahren nach Anspruch 1, dadurch g e k e n n z e i c h n e t daß der Mengenstrom der zuzuführenden Additive von der Motordrehzahl abhängig ist. 2. The method according to claim 1, characterized in that g e k e n n z e i c h n e t that the flow rate of the additives to be added depends on the engine speed.
DE19843420199 1984-05-30 1984-05-30 Method for controlling the combustion of the soot contained in the exhaust gas from internal combustion engines Granted DE3420199A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19843420199 DE3420199A1 (en) 1984-05-30 1984-05-30 Method for controlling the combustion of the soot contained in the exhaust gas from internal combustion engines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843420199 DE3420199A1 (en) 1984-05-30 1984-05-30 Method for controlling the combustion of the soot contained in the exhaust gas from internal combustion engines

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DE3420199A1 true DE3420199A1 (en) 1985-12-05
DE3420199C2 DE3420199C2 (en) 1989-05-11

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605255A1 (en) * 1986-02-19 1987-08-20 Fev Forsch Energietech Verbr METHOD FOR REGENERATING EXHAUST GAS PARTICLE FILTER SYSTEMS
DE4100780A1 (en) * 1991-01-12 1992-07-16 Daimler Benz Ag Filter cleaning in diesel engine exhaust system - being aided by chemical additive injected in accordance with memorised relationship of engine speed to load
DE4230180A1 (en) * 1992-09-09 1994-03-10 Eberspaecher J Method and device for determining the loading status of particle filters
WO1995006815A1 (en) * 1993-09-01 1995-03-09 H J S Fahrzeugteile-Fabrik Gmbh & Co. Process and device for cleaning a soot filter in the exhaust system of a diesel-fuelled internal combustion engine
WO2003100244A1 (en) * 2002-05-23 2003-12-04 Volkswagen Method for operating a diesel engine
GB2390643A (en) * 2002-06-07 2004-01-14 Ford Global Tech Llc Fuel supply system for an internal combustion engine with means for dosing the fuel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299600A (en) * 1980-01-09 1981-11-10 Toyota Jidosha Kogyo Kabushiki Kaisha Trapper device for collecting and incinerating fine particulates included in exhaust gas from a diesel engine
DE3111228A1 (en) * 1981-03-21 1982-09-30 Filterwerk Mann & Hummel Gmbh, 7140 Ludwigsburg METHOD AND DEVICE FOR ELIMINATING SOOT FROM THE EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299600A (en) * 1980-01-09 1981-11-10 Toyota Jidosha Kogyo Kabushiki Kaisha Trapper device for collecting and incinerating fine particulates included in exhaust gas from a diesel engine
DE3111228A1 (en) * 1981-03-21 1982-09-30 Filterwerk Mann & Hummel Gmbh, 7140 Ludwigsburg METHOD AND DEVICE FOR ELIMINATING SOOT FROM THE EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SAE-paper 830 083 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605255A1 (en) * 1986-02-19 1987-08-20 Fev Forsch Energietech Verbr METHOD FOR REGENERATING EXHAUST GAS PARTICLE FILTER SYSTEMS
DE4100780A1 (en) * 1991-01-12 1992-07-16 Daimler Benz Ag Filter cleaning in diesel engine exhaust system - being aided by chemical additive injected in accordance with memorised relationship of engine speed to load
DE4230180A1 (en) * 1992-09-09 1994-03-10 Eberspaecher J Method and device for determining the loading status of particle filters
WO1995006815A1 (en) * 1993-09-01 1995-03-09 H J S Fahrzeugteile-Fabrik Gmbh & Co. Process and device for cleaning a soot filter in the exhaust system of a diesel-fuelled internal combustion engine
DE4329407C1 (en) * 1993-09-01 1995-03-09 Hjs Fahrzeugteile Gmbh Method for cleaning a soot filter in exhaust systems of an internal combustion engine operated with diesel fuel and device for carrying out the method
WO2003100244A1 (en) * 2002-05-23 2003-12-04 Volkswagen Method for operating a diesel engine
DE10222762A1 (en) * 2002-05-23 2003-12-04 Volkswagen Ag Method for operating a diesel engine
GB2390643A (en) * 2002-06-07 2004-01-14 Ford Global Tech Llc Fuel supply system for an internal combustion engine with means for dosing the fuel
GB2390643B (en) * 2002-06-07 2005-09-14 Ford Global Tech Llc A fuel supply system for an internal combustion engine

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Owner name: MERCEDES-BENZ AKTIENGESELLSCHAFT, 7000 STUTTGART,

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