EP0231828B1 - Process and device for regenerating a diesel soot filter - Google Patents

Process and device for regenerating a diesel soot filter Download PDF

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Publication number
EP0231828B1
EP0231828B1 EP87100911A EP87100911A EP0231828B1 EP 0231828 B1 EP0231828 B1 EP 0231828B1 EP 87100911 A EP87100911 A EP 87100911A EP 87100911 A EP87100911 A EP 87100911A EP 0231828 B1 EP0231828 B1 EP 0231828B1
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EP
European Patent Office
Prior art keywords
soot filter
diesel
throttling
pressure
diesel soot
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EP87100911A
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German (de)
French (fr)
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EP0231828A1 (en
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Konstantin N. Prof.Dr.-Ing. Pattas
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    • 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
    • F01N3/0235—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 using exhaust gas throttling means
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • 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

Definitions

  • the invention relates to a method and a device for the regeneration of a diesel soot filter which is installed in the outlet duct of a diesel engine, the exhaust gas in that section of the outlet duct which contains the diesel soot filter being compressed by controlled throttling of the outlet duct to such an extent that the Regeneration temperature limit is reached or exceeded.
  • Diesel soot filters with a porous wall, in particular made of a monolithic ceramic material, have been developed for filtering the solids, such as soot, contained in the exhaust gas of a diesel engine.
  • the soot separated in the diesel soot filter is ignited and burned in the presence of residual oxygen contained in the exhaust gas. This regenerates the diesel soot filter.
  • the engine When driving around town (e.g. European driving cycle ECE-15) of diesel cars, trucks or buses, the engine is mainly operated in the partial load range.
  • the temperature in the outlet channel remains below the regeneration temperature limit, so that the deposited soot is not burned and the diesel soot filter is not regenerated.
  • a burner has been installed in the outlet channel in front of the soot filter to regenerate the soot filter. Sufficiently high temperatures are reached with a burner; however, the temperatures become so high that the diesel particulate filter can easily be damaged or destroyed. In addition, such burners have to work against the pressure in the outlet channel, which has not yet been satisfactorily resolved.
  • the invention has for its object to provide a method and an apparatus which enables a timely and sufficient regeneration of the soot filter without the risk of its premature destruction due to local melting of the filter material.
  • the method according to claim 1 serves to achieve this object.
  • the amount of fuel is preferably reduced in a controlled manner as a function of the pressure in the outlet channel.
  • a device for the regeneration of a diesel soot filter is characterized according to the invention by the features of claim 4.
  • control device comprises a movable wall which can be acted upon by the pressure in the outlet line and which is coupled to a control rod of a fuel injection pump, the movable wall expediently on one side from the pressure in the outlet line and on the other side is acted upon by a prestressed compression spring.
  • the throttling can be controlled manually or automatically depending on the pressure drop in the diesel particulate filter.
  • the throttling can be switched off in both cases by fully pressing the accelerator pedal ("kick-down"), so that the full power of the diesel engine is available if required.
  • the throttle device can instead of one Valve can also be formed by a throttle valve which has a control bore.
  • the exhaust gas is compressed automatically or at selected times in the section of the exhaust duct which contains the diesel soot filter.
  • the temperature and pressure in this section are increased to such an extent that ignition and combustion of the soot or solids in the exhaust gas separated out in the diesel soot filter takes place with certainty.
  • overloading of the soot filter is avoided when the machine is operating at full load with the outlet duct throttled.
  • the invention allows the regeneration of the diesel soot filter to be carried out in time intervals which can be selected as required and which are only a fraction, e.g. 1/100 of the total operating time of the engine. In this way, an impairment of engine operation due to regeneration can be practically eliminated.
  • the regeneration of the diesel soot filter can take place, for example, when the vehicle is idling or when a stationary diesel engine is idling or when the diesel engine is in motion or under load. Dabie makes it possible to provide the full power of the engine for the regeneration of the diesel soot filter even with no load by appropriately dimensioning the Dorssel worn.
  • the exhaust gas temperature that can be achieved in this way exceeds the lower limit of the regeneration temperature range. The lower this lower limit is, the faster the desired regeneration is achieved.
  • an injection pump 12 belongs to a diesel engine 11.
  • a soot filter 10 is switched on in the outlet duct 13 for the exhaust gases of the diesel engine 11.
  • a throttle device 14 is installed in the outlet channel in order to raise the pressure in the outlet channel upstream of the soot filter 10 to a value at which the soot separated in the soot filter 10 ignites and burns.
  • the injection pump 12 is assigned a control device 16 which has a movable wall or membrane 15 which on one side is subjected to the pressure in the outlet channel 13 between the diesel engine 11 and the throttle device 14 and on the other side by a prestressed compression spring 18 with a defined, e.g. progressive spring behavior is applied.
  • the membrane is connected in the middle to a control rod 19, which controls the full load stop in the injection pump 12.
  • an enlargement of the operating range under the torque curve 30 compared to FIG. 2 can also be achieved when the control device 16 is not acted upon by the pressure in the outlet channel 13 but rather when the throttle device 14 takes effect, the metered amount of fuel by a predetermined amount, e.g. a constant amount is reduced.
  • a predetermined amount e.g. a constant amount

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Regenerierung eines Dieselrußfilters, das in den Auslaßkanal eines Dieselmotors eingebaut ist, wobei das Abgas in demjenigen Abschnitt des Auslaßkanales, welcher das Dieselrußfilter enthält, durch gesteuertes Drosseln des Auslaßkanals in einem solchen Maße verdichtet wird, das die Regenerierungstemperaturgrenze erreicht oder überschritten wird.The invention relates to a method and a device for the regeneration of a diesel soot filter which is installed in the outlet duct of a diesel engine, the exhaust gas in that section of the outlet duct which contains the diesel soot filter being compressed by controlled throttling of the outlet duct to such an extent that the Regeneration temperature limit is reached or exceeded.

Es sind Dieselrußfilter mit poröser Wand insbesondere aus Keramikwerkstoff in Monolithbauweise zur Filtrierung der im Abgas eines Dieselmotors enthaltenen Feststoffe, wie Ruß, entwikkelt worden. Bei Temperaturen zwischen 500°C und 600°C wird der im Dieselrußfilter abgeschiedene Ruß in Anwesenheit von im Abgas enthaltenem Restsauerstoff gezündet und verbrannt. Das Dieselrußfilter wird dadurch regeneriert. Damit diese Regenerierung stattfinden kann, muß eine Temperatur in dem genannten Bereich im Dieselrußfilter herrschen, die oberhalb der unteren Temperaturgrenze des erwähnten Regenierungstemperaturbereiches liegt.Diesel soot filters with a porous wall, in particular made of a monolithic ceramic material, have been developed for filtering the solids, such as soot, contained in the exhaust gas of a diesel engine. At temperatures between 500 ° C and 600 ° C, the soot separated in the diesel soot filter is ignited and burned in the presence of residual oxygen contained in the exhaust gas. This regenerates the diesel soot filter. In order for this regeneration to take place, there must be a temperature in the diesel soot filter in the range mentioned above which is above the lower temperature limit of the regeneration temperature range mentioned.

Bei Stadtfahrten (z.B. Europa-Fahrzyklus ECE-15) von Diesel-PKW, -LKW oder -Omnibussen wird der Motor überwiegend im Teillastbereich - betrieben. Dabei bleibt die Temperatur im Auslaßkanal unterhalb der Regenerierungstemperaturgrenze, so daß der abgeschiedene Ruß nicht verbrannt und das Dieselrußfilter nicht regeneriert wird.When driving around town (e.g. European driving cycle ECE-15) of diesel cars, trucks or buses, the engine is mainly operated in the partial load range. The temperature in the outlet channel remains below the regeneration temperature limit, so that the deposited soot is not burned and the diesel soot filter is not regenerated.

Es ist bekannt, die Regenerierungstemperatur abzusenken, z.B. durch Imprägnieren der porösen Filterwand des Dieselrußfilters mit Metall oder Metalloxiden, welche eine katalytische Wirkung aufweisen, oder durch Zusätze von Metallverbindungen im Kraftstoff (Bleiäthyl, Manganoxyd usw.). Solche Zusätze können aber zu Umweltbelastungen führen.It is known to lower the regeneration temperature, e.g. by impregnating the porous filter wall of the diesel particulate filter with metal or metal oxides, which have a catalytic effect, or by adding metal compounds in the fuel (lead ethyl, manganese oxide, etc.). However, such additives can lead to environmental pollution.

Es ist auch schon bekannt, die Abgastemperatur zu erhöhen, z.B. durch Drosseln der Ansaugluft des Motors. Dies führt jedoch nicht zu der erforderlichen Regenerierungstemperatur. Eine andere bekannte Maßnahme besteht darin, das Dieselrußfilter möglichst nahe am Auslaßventil im Auslaßkanal anzuordnen, weil dort die Temperaturen hoch sind. Diese Lösung führt aber ebenfalls nicht zu genügend hohen Temperaturen im Dieselrußfilter und begegnet im übrigen wegen der beschränkten Platzverhältnisse im Motorraum eines Fahrzeuges Einbauschwierigkeiten.It is also known to increase the exhaust gas temperature, e.g. by throttling the intake air of the engine. However, this does not lead to the required regeneration temperature. Another known measure consists in arranging the diesel soot filter as close as possible to the exhaust valve in the exhaust duct because the temperatures are high there. However, this solution also does not lead to sufficiently high temperatures in the diesel soot filter and, moreover, encounters installation difficulties because of the limited space available in the engine compartment of a vehicle.

Ferner hat man zur Regenerierung des Rußfilters einen Brenner in den Auslaßkanal vor dem Rußfilter eingebaut. Mit einem Brenner werden zwar ausreichend hohe Temperaturen erreicht; doch werden die Temperaturen hierbei so hoch, daß das Dieselrußfilter leicht beschädigt oder zerstört werden kann. Außerdem müssen solche Brenner entgegen dem Druck im Auslaßkanal arbeiten, was bisher noch nicht zufriedenstellend gelöst wurde.Furthermore, a burner has been installed in the outlet channel in front of the soot filter to regenerate the soot filter. Sufficiently high temperatures are reached with a burner; however, the temperatures become so high that the diesel particulate filter can easily be damaged or destroyed. In addition, such burners have to work against the pressure in the outlet channel, which has not yet been satisfactorily resolved.

Um diese Schwierigkeiten zu beheben, ist vorgeschlagen worden, in den Auslaßkanal stromabwärts vom Rußfilter eine den Abströmweg der Abgase absperrende Klappe vorzusehen, die auch abhängig vom Differenzdruck der Drücke im Auslaßkanal stromaufwärts und stromabwärts vom Rußfilter gesteuert werden kann (DE-OS 29 30 969), (JA-OS 57-65 811).In order to remedy these difficulties, it has been proposed to provide a flap which blocks the outflow path of the exhaust gases in the outlet channel downstream of the soot filter and which can also be controlled depending on the differential pressure of the pressures in the outlet channel upstream and downstream of the soot filter (DE-OS 29 30 969) , (JA-OS 57-65 811).

Bei Drosselbetrieb wird der Liefergrad der Brennkraftmaschine drastisch reduziert. Folglich wird der Brennkraftmaschine mehr Kraftstoff zugeführt als verbrannt werden kann. Der Kraftstoffüberschuß wird in Ruß umgewandelt, der in einer solchen Menge anfällt, daß das Filter zu stark mit Ruß beladen wird. Versuche des Anmelders haben gezeigt, daß im Rußfilter eine obere Grenztemperatur, die in der Praxis bei 650°C liegen kann, nicht überschritten werden darf. Diese Grenztemperatur verlagert sich zu tieferen Temperaturen, wenn die Rußbeladung des Filters höher wird. Bei Überschreiten der oberen Grenztemperatur kann lokales Schmelzen und damit eine Zerstörung des Filters bedingt durch die Zündung und Verbrennung des abgelagerten Rußes die Folge sein. Dieses Problem läßt sich auch mit dem zuletzt genannten bekannten Verfahren nicht beheben.With throttle operation, the delivery rate of the internal combustion engine is drastically reduced. As a result, more fuel is supplied to the internal combustion engine than can be burned. The excess fuel is converted into soot, which is produced in such an amount that the filter is overloaded with soot. Experiments by the applicant have shown that an upper limit temperature, which in practice can be around 650 ° C., must not be exceeded in the soot filter. This limit temperature shifts to lower temperatures when the soot load on the filter increases. If the upper limit temperature is exceeded, local melting and thus destruction of the filter due to the ignition and combustion of the deposited soot can result. This problem cannot be solved with the known method mentioned last.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, das bzw. die eine rechtzeitige und ausreichende Regenerierung des Rußfilters ohne Gefahr von dessen vorzeitiger Zerstörung aufgrund lokalen Schmelzens des Filtermaterials ermöglicht.The invention has for its object to provide a method and an apparatus which enables a timely and sufficient regeneration of the soot filter without the risk of its premature destruction due to local melting of the filter material.

Zur Lösung dieser Aufgabe dient das Verfahren nach Anspruch 1.The method according to claim 1 serves to achieve this object.

Mit aufgrund der Drosselung zunehmendem Druck im Auslaßkanal wird entsprechend weniger Kraftstoff zugemessen, so daß die Gefahr der übermäßigen Rußbildung bei Vollastbetrieb des Motors vermieden wird. Die Drosselung des Abgasstromes stromaufwärts vom Dieselrußfilter sorgt dafür, daß dieser im Bereich kleineren Druckes und damit geringerer Beanspruchung im Betrieb liegt.With increasing pressure in the exhaust port due to the throttling, correspondingly less fuel is metered in, so that the risk of excessive soot formation when the engine is operating at full load is avoided. The throttling of the exhaust gas flow upstream of the diesel soot filter ensures that it is in the range of lower pressure and therefore less stress during operation.

Vorzugsweise wird die Kraftstoffmenge gesteuert in Abhängigkeit vom Druck in dem Auslaßkanal reduziert.The amount of fuel is preferably reduced in a controlled manner as a function of the pressure in the outlet channel.

Eine Vorrichtung zur Regenerierung eines Dieselrußfilters kennzeichnet sich erfindungsgemäß durch die Merkmale des Anspruchs 4.A device for the regeneration of a diesel soot filter is characterized according to the invention by the features of claim 4.

Bei einer Weiterbildung dieser Vorrichtung ist erfindungsgemäß vorgesehen, daß die Steuervorrichtung eine vom Druck in der auslaßleitung beaufschlagbaren bewegliche Wand umfaßt, die mit einer Regelstange einer Kraftstoff-Einspritzpumpe gekoppelt ist, wobei die bewegliche Wand zweckmäßig auf der einen Seite vom Druck in der Auslaßleitung und auf der anderen Seite von einer vorgespannten Druckfeder beaufschlagt ist.In a development of this device it is provided according to the invention that the control device comprises a movable wall which can be acted upon by the pressure in the outlet line and which is coupled to a control rod of a fuel injection pump, the movable wall expediently on one side from the pressure in the outlet line and on the other side is acted upon by a prestressed compression spring.

Die Drosselung kann manuell oder selbsttätig in Abhängigkeit vom Druckverlust im Dieselrußfilter gesteuert sein. Die Drosselung kann in beiden Fällen durch volle Betätigung des Gaspedales ("Kick-down") abgeschaltet werden, so daß bei Bedarf die volle Leistung des Dieselmotors zur Verfügung steht.The throttling can be controlled manually or automatically depending on the pressure drop in the diesel particulate filter. The throttling can be switched off in both cases by fully pressing the accelerator pedal ("kick-down"), so that the full power of the diesel engine is available if required.

Die Drosseleinrichtung kann anstatt von einem Ventil auch von einer Drosselklappe gebildet sein, welche eine Steuerbohrung aufweist.The throttle device can instead of one Valve can also be formed by a throttle valve which has a control bore.

Im Betrieb des Dieselmotors wird das Abgas in dem Abschnitt des Auslaßkanales, der das Dieselrußfilter enthält, selbsttätig bzw. zu gewählten Zeitpunkten verdichtet. Dadurch werden in diesem Abschnitt Temperatur und Druck in einem solchen Maß erhöht, daß Zündung und Verbrennung des im Dieselrußfilter abgeschiedenen Rußes bzw. der Feststoffe im Abgas mit Sicherheit erfolgt. Gleichzeitig wird eine Überbeladung des Rußfilters im Vollastbetrieb der Maschine bei gedrosseltem Auslaßkanal vermieden. Somit wird die gewünschte Regenerierung unter allen Betriebsbedingungen des Dieselmotors, d.h. auch im Leerlauf und bei Teillast, stets sichergestellt.During operation of the diesel engine, the exhaust gas is compressed automatically or at selected times in the section of the exhaust duct which contains the diesel soot filter. As a result, the temperature and pressure in this section are increased to such an extent that ignition and combustion of the soot or solids in the exhaust gas separated out in the diesel soot filter takes place with certainty. At the same time, overloading of the soot filter is avoided when the machine is operating at full load with the outlet duct throttled. Thus the desired regeneration under all operating conditions of the diesel engine, i.e. always ensured, even when idling and at partial load.

Die Erfindung erlaubt es, die Regenerierung des Dieselrußfilters in nach Bedarf wählbaren Zeitabschnitten vorzunehmen, welche nur einen Bruchteil, z.B. 1/100, der gesamten Betriebszeit des Motors ausmachen. Dadurch läßt sich eine Beeinträchtigung des Motorbetriebes durch die Regenerierung praktisch ausschalten.The invention allows the regeneration of the diesel soot filter to be carried out in time intervals which can be selected as required and which are only a fraction, e.g. 1/100 of the total operating time of the engine. In this way, an impairment of engine operation due to regeneration can be practically eliminated.

Die Regenerierung des Dieselrußfilters kann beispielsweise im Leerlauf bei stehendem Fahrzeug bzw. im lastfreien Betrieb eines stationären Diesemotors oder während der Fahrt bzw. unter Last des Dieselmotors erfolgen. Dabie ist es möglich, durch entsprechende Dimensionierung der Dorsseleinrichtung die volle Leistung des Motors für die Regenerierung des Dieselrußfilters auch bei Nullast bereitzustellen. Die auf diese Weise erreichbare Abgastemperatur übersteigt die untere Grenze des Regenerierungs-Temperaturbereiches. Je tiefer diese untere Grenze liegt, desto schneller wird die gewünschte Regenerierung erzielt.The regeneration of the diesel soot filter can take place, for example, when the vehicle is idling or when a stationary diesel engine is idling or when the diesel engine is in motion or under load. Dabie makes it possible to provide the full power of the engine for the regeneration of the diesel soot filter even with no load by appropriately dimensioning the Dorsseleinrichtung. The exhaust gas temperature that can be achieved in this way exceeds the lower limit of the regeneration temperature range. The lower this lower limit is, the faster the desired regeneration is achieved.

Die Erfindung ist im folgenden anhand schematischer Zeichnungen an zwei Ausführungsbeispielen einer erfindungsgemäßen Vorrichtung näher erläutert. Es zeigen:

  • Fig. 1 eine schematisierte Darstellung einer Vorrichtung gemäß der Erfindung,
  • Fig. 2 und 3 in Drehmoment-Drehzahl-Diagrammen einen Vergleich der beim Stand der Technik und bei der Erfindung zur Regenerierung ausnutzbaren Bereiche des Dieselmotor-Kennfeldes.
The invention is explained in more detail below with the aid of schematic drawings of two exemplary embodiments of a device according to the invention. Show it:
  • 1 is a schematic representation of a device according to the invention,
  • 2 and 3 in torque-speed diagrams a comparison of the areas of the diesel engine map which can be used for regeneration in the prior art and in the invention.

Gemäß Fig. 1 gehört zu einem Dieselmotor 11 eine Einspritzpumpe 12. In den Auslaßkanal 13 für die Abgase des Dieselmotors 11 ist ein Rußfilter 10 eingeschaltet. Stromaufwärts vom Rußfilter 10 ist eine Drosseleinrichtung 14 in den Auslaßkanal eingebaut, um den Druck im Auslaßkanal vor dem Rußfilter 10 auf einen Wert anzuheben, bei welcher sich der im Rußfilter 10 abgeschiedene Ruß entzündet und verbrennt.According to FIG. 1, an injection pump 12 belongs to a diesel engine 11. A soot filter 10 is switched on in the outlet duct 13 for the exhaust gases of the diesel engine 11. Upstream of the soot filter 10, a throttle device 14 is installed in the outlet channel in order to raise the pressure in the outlet channel upstream of the soot filter 10 to a value at which the soot separated in the soot filter 10 ignites and burns.

Der Einspritzpumpe 12 ist eine Steuervorrichtung 16 zugeordnet, welche eine bewegliche Wand bzw. Membran 15 aufweist, die auf ihrer einen Seite vom Druck im Auslaßkanal 13 zwischen Dieselmotor 11 und Drosseleinrichtung 14 und auf ihrer anderen Seite von einer vorgespannten Druckfeder 18 mit einem definierten, z.B. progressiven Federverhalten beaufschlagt ist. Die Membran ist mittig mit einer Regelstange 19 verbunden, welche den Vollastanschlag in der Einspritzpumpe 12 regelt. Erhöht sich aufgrund einer Drosselung mittels der Drosseleinrichtung 14 der Druck im' Auslaßkanal 13, so erhöht sich auch der Druck in einer Zweigleitung 17 und damit in der Kammer der Steuereinrichtung 16 oberhalb der Membran 15, so daß diese gegen die Kraft der Feder 18 zusammen mit der Regelstange 19 nach außen bewegt wird und die von der Einspritzpumpe 12 zugemessene Kraftstoffmenge reduziert.The injection pump 12 is assigned a control device 16 which has a movable wall or membrane 15 which on one side is subjected to the pressure in the outlet channel 13 between the diesel engine 11 and the throttle device 14 and on the other side by a prestressed compression spring 18 with a defined, e.g. progressive spring behavior is applied. The membrane is connected in the middle to a control rod 19, which controls the full load stop in the injection pump 12. If the pressure in the outlet duct 13 increases as a result of throttling by means of the throttle device 14, the pressure in a branch line 17 and thus in the chamber of the control device 16 above the diaphragm 15 also increases, so that the latter acts against the force of the spring 18 together with the control rod 19 is moved outwards and the amount of fuel metered by the injection pump 12 is reduced.

Die Fig. 2 und 3 zeigen den Kurvenverlauf 30 des Drehmomentes Md über der Drehzahl n. Am Punkt 34 der Drehmomentkurve 30 ist die Nenndrehzahl erreicht. Die Kurven 31 und 32 zeigen in Fig. 2 am Stand der Technik und in Fig. 3 bei der Erfindung die Betriebsbereichsgrenzen unter der Drehmomentkurve 30 innerhalb deren eine Drosselung mittels der Drosseleinrichtung ohne Gefahr der Zerstörung des Rußfilters 10 möglich ist.2 and 3 show the curve 30 of the torque M d over the speed n. At point 34 of the torque curve 30, the nominal speed has been reached. Curves 31 and 32 show in FIG. 2 at the state of the art and in FIG. 3 in the case of the invention the operating range limits under the torque curve 30 within which throttling by means of the throttle device is possible without risk of destroying the soot filter 10.

Es ist ersichtlich, daß im Bereich von Teillast und Vollast insbesondere bei größer werdenden Drehzahlen eine Regenerierung durch Drosselung des Abgases nicht möglich ist, während sie gemäß dem schraffierten Bereich unter der Kurve 30 nach Fig. 3 aufgrund der erfindungsgemäßen Maßnahme auch bei hohen Drehzahlen im Teillast- und Vollastbereich möglich ist. Dies beruht darauf, daß die Kraftstoffzufuhr in diesem Betriebsbereich erfindungsgemäß abgesenkt und damit die Rußbildung durch überschüssigen Kraftstoff aufgrund des bei der Dorsselung verminderten Liefergrades ausgeschlossen ist.It can be seen that regeneration by throttling the exhaust gas is not possible in the region of partial load and full load, in particular at increasing speeds, while, according to the hatched area under curve 30 according to FIG. 3, due to the measure according to the invention, it is also possible at high speeds in partial load - and full load range is possible. This is based on the fact that, according to the invention, the fuel supply is reduced in this operating range and thus the formation of soot due to excess fuel is ruled out owing to the reduced delivery rate in the village.

Im Gegensatz zur Darstellung gemäß Fig. 1 läßt isch eine Vergrößerung des Betriebsbereiches unter der Drehmomentkurve 30 im Vergleich zu Fig. 2 auch dann erreichen, wenn die Steuereinrichtung 16 nicht vom Druck im Auslaßkanal 13 beaufschlagt ist sondern jeweils bei wirksam werdender Drosseleinrichtung 14 die zugemessene Kraftstoffmenge um einen vorgegebenen Betrag, z.B. einen konstanten Betrag, reduziert ist. Optimale Verhältnisse ergeben sich jedoch bei Beaufschlagung der Membran 15 der Steuereinrichtung 16 mit dem Druck im Auslaßkanal 13 über die Rückführleitung 17 gemäß Fig. 1.In contrast to the representation according to FIG. 1, an enlargement of the operating range under the torque curve 30 compared to FIG. 2 can also be achieved when the control device 16 is not acted upon by the pressure in the outlet channel 13 but rather when the throttle device 14 takes effect, the metered amount of fuel by a predetermined amount, e.g. a constant amount is reduced. However, optimal conditions result when the diaphragm 15 of the control device 16 is acted upon by the pressure in the outlet channel 13 via the return line 17 according to FIG. 1.

Es ist auch denkbar, die Drosseleinrichtung unabhängig vom Druck im Auslaßkanal 13 zu steuern, und zwar zu gewünschten Zeiten oder bei bestimmten Betriebszuständen des Dieselmotors, um wahlweise eine bestimmte Drosselwirkung zu erzielen, beispielswiese auf Knopfdruck des Fahrers hin. Auch ist denkbar, die Drosseleinrichtung 14 abhängig vom Differenzdruck vor und hinter der Drosselstelle zu steuern.It is also conceivable to control the throttle device independently of the pressure in the outlet channel 13, at desired times or in certain operating states of the diesel engine, in order to selectively achieve a certain throttling effect, for example at the push of a button of the driver. It is also conceivable to control the throttle device 14 in front of and behind the throttle point depending on the differential pressure.

Claims (7)

1. A process for regenerating a diesel soot filter disposed in the exhaust duct of a diesel engine, the exhaust gas being compressed in that section of the exhaust duct which contains the diesel soot filter (10), by controlled throttling of the exhaust duct, the compression being effected to a degree such that the regeneration temperature limit is reached or exceeded, characterised in that the throttling is effected upstream of the diesel soot filter (10) and in that the amount of fuel allocated to the diesel engine is reduced during the throttling.
2. A process according to claim 1, characterised in that the quantity of fuel is reduced in dependence on the pressure at a place upstream of the diesel soot filter.
3. A process according to claim 1 or 2, characterised in that the throttling is effected automatically in dependence on the pressure at a place in the exhaust duct (13) upstream of the diesel soot filter (10).
4. A device for performing the process according to any one of claims 1 to 3, characterised in that the throttling device (14) is disposed in the exhaust duct (13) upstream of the diesel soot fitter
(10) and in that a control device (16) is provided to reduce the amount of fuel allocated to the engine during operation of the throttling device (14).
5. A device according to claim 4, characterised in that the control device (16) comprises a movable wall (15) adapted to be subjected to the pressure in the exhaust line (13) and coupled to a control rod (19) of a fuel injection pump (12).
6. A device according to claim 5, characterised in that one side of the movable wall (15) is subjected to the pressure in the exhaust line (13) and the other side is subjected to the action of a prestressed compression spring.
EP87100911A 1986-01-24 1987-01-23 Process and device for regenerating a diesel soot filter Expired - Lifetime EP0231828B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3602038 1986-01-24
DE3602038A DE3602038C1 (en) 1986-01-24 1986-01-24 Method and device for regenerating a diesel soot filter

Publications (2)

Publication Number Publication Date
EP0231828A1 EP0231828A1 (en) 1987-08-12
EP0231828B1 true EP0231828B1 (en) 1990-05-30

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ID=6292495

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Application Number Title Priority Date Filing Date
EP87100911A Expired - Lifetime EP0231828B1 (en) 1986-01-24 1987-01-23 Process and device for regenerating a diesel soot filter

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EP (1) EP0231828B1 (en)
DE (2) DE3602038C1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538109C1 (en) * 1985-10-26 1987-02-26 Man Technologie Gmbh Diesel engine with soot filter
DE3643315A1 (en) * 1986-12-18 1988-06-30 Kloeckner Humboldt Deutz Ag METHOD AND DEVICE FOR BURNING OFF THE SOOT accumulated in a soot filter of an air-compressing internal combustion engine
JPH01127016A (en) * 1987-11-12 1989-05-19 Ngk Insulators Ltd Combustion regenerating method for ceramic honeycomb filter
DE3806219C2 (en) * 1988-02-26 1997-12-11 Pattas Konstantin N Soot filter system
DE3818158A1 (en) * 1988-05-28 1989-12-07 Man Nutzfahrzeuge Ag Method and device for the removal of soot deposited in an exhaust-gas filter of an internal combustion engine
DE3832790C2 (en) * 1988-09-27 1997-12-11 Pattas Konstantin N Method and device for regenerating a soot filter
DE4041627C1 (en) * 1990-12-22 1992-06-17 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De
DE19701684A1 (en) * 1997-01-20 1998-07-23 Deutz Ag Particle filter
JP3528753B2 (en) * 2000-04-21 2004-05-24 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1135294A (en) * 1954-06-05 1957-04-26 Device for using the dynamic pressure prevailing in front of the brake throttle arranged in the exhaust duct, applicable to internal combustion engines fitted with an engine brake
DE2757242A1 (en) * 1977-12-22 1979-07-05 Daimler Benz Ag STARTING AND STOPPING DEVICE, ACTUATED BY A MAIN SWITCH USING A KEY, FOR VEHICLES WITH AN AIR COMPRESSING FUEL INJECTED ENGINE
DE2930969A1 (en) * 1979-07-31 1981-02-26 Daimler Benz Ag Exhaust system for IC engines - has damper to produce adiabatic temperature rise to burn off soot in filter

Also Published As

Publication number Publication date
EP0231828A1 (en) 1987-08-12
DE3602038C1 (en) 1987-01-02
DE3762983D1 (en) 1990-07-05

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