DE4000062A1 - Igniting soot particles on diesel filter - involves use of air warmed by exhaust gas heat exchanger - Google Patents

Igniting soot particles on diesel filter - involves use of air warmed by exhaust gas heat exchanger

Info

Publication number
DE4000062A1
DE4000062A1 DE4000062A DE4000062A DE4000062A1 DE 4000062 A1 DE4000062 A1 DE 4000062A1 DE 4000062 A DE4000062 A DE 4000062A DE 4000062 A DE4000062 A DE 4000062A DE 4000062 A1 DE4000062 A1 DE 4000062A1
Authority
DE
Germany
Prior art keywords
exhaust gas
heat exchanger
gas heat
air
soot particles
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.)
Withdrawn
Application number
DE4000062A
Other languages
German (de)
Inventor
Hans Prof Dipl Ing Moeller
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE4000062A priority Critical patent/DE4000062A1/en
Publication of DE4000062A1 publication Critical patent/DE4000062A1/en
Withdrawn legal-status Critical Current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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • 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
    • 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
    • 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
    • Y02T10/12—Improving ICE efficiencies

Abstract

The arrangement is for igniting soot particles deposited onto the exhaust filter (4) of a Diesel engine (1). The amount of combustion air reaching the engine can be restricted by a throttle valve (2). An exhaust gas heat exchanger (3) warms cold air which is then delivered by a second pipe upstream of the throttle valve, raising the exhaust gas temp. in the filter by up to 200 deg.C. USE/ADVANTAGE - Method of burning off soot particles from Diesel engine exhaust which can be adjusted to proceed as a continuous process.

Description

Die Erfindung betrifft eine Vorrichtung zum Zünden von Ruß­ partikelfiltern bei Dieselmotoren durch Erhöhen der Abgas­ temperatur.The invention relates to a device for igniting soot Particulate filters in diesel engines by increasing the exhaust gas temperature.

Nach dem Stand der Technik bestehen Rußpartikelfilter bei Dieselmotoren, auch Dieselpartikelfilter genannt, aus Metall- oder Keramikbauteilen, welche mit porösen Wänden oder anderen kleinsten Öffnungen die Dieselabgase vom Ruß reinigen, indem sie diese Rußteilchen festhalten, die Abgase jedoch durch­ strömen lassen. Nach einer gewissen Betriebszeit hat sich der Ruß an den porösen Wänden oder entsprechenden Bauteilen zu einer Schicht abgelagert, die entfernt werden muß, zweckmäßi­ ger Weise durch Abtrennen mit Luft oder sauerstoffhaltigem Abgas. Voraussetzung hierfür ist das Aufheizen des Rußbelags auf die erforderliche Zündtemperatur, die zwischen 500 und 600°C liegt, bei katalytischer Beschichtung des Partikelfil­ ters zwischen 400 und 500°C. Bei Dieselmotoren werden obige Temperaturen entweder garnicht, oder nur bei höchstem Dreh­ moment erreicht. Hierdurch ist die Verwendung dieser Filter­ art nur begrenzt möglich oder diese Filter müssen nach Er­ reichen einer bestimmten Betriebsstundenzahl in einem beson­ deren Ofen freigebrannt werden.According to the prior art, there are soot particle filters Diesel engines, also called diesel particulate filters, made of metal or ceramic components, which have porous walls or others Smallest openings clean the diesel exhaust from the soot by they hold onto these soot particles, but the exhaust fumes let flow. After a certain operating time, the Soot on the porous walls or corresponding components deposited a layer that must be removed, expediently by separating with air or oxygen Exhaust gas. The prerequisite for this is heating up the soot coating to the required ignition temperature, which is between 500 and 600 ° C, with catalytic coating of the particle film between 400 and 500 ° C. In diesel engines, the above Temperatures either not at all, or only at the highest speed moment reached. This is the use of these filters only possible to a limited extent or these filters must be modified according to Er range from a certain number of operating hours in a particular whose furnace is burned free.

Es ist Aufgabe dieser Erfindung, das Zünden und Freibrennen im Auspuff ohne Unterbrechung und bei nur geringer Beeinträchtigung des Dieselbetriebs zu ermög­ lichen.It is an object of this invention the ignition and free burning in the exhaust without interruption and with only a slight impairment of diesel operation lichen.

Darstellung der Erfindung:Presentation of the invention:

In die Luftansaugleitung des Dieselmotors wird ein Absperr- oder Drosselorgan gem. Fig. 1 so eingebaut, daß je nach dessen Einstellen in unterschiedlichem MaßeIn the air intake line of the diesel engine, a shut-off or throttle device is gem. Fig. 1 installed so that depending on its setting to different degrees

  • a) die angesaugte Luftmasse und damit die Luftdichte im Zylinderraum des Dieselmotors vermindert wird. Hierdurch wird auch bei Teillast des Motors die Luftverhältniszahl der Verbrennung auf den Mindestwert herab- und somit die Abgastemperatur auf den Höchstwert hinaufgesetzt;a) the intake air mass and thus the air density in Cylinder space of the diesel engine is reduced. Hereby is the air ratio even at partial load of the engine the combustion to the minimum value and thus the Exhaust gas temperature raised to the maximum;
  • b) in einem Abgaswärmetauscher aufgeheizte Luft infolge des Druckabfalls hinter dem Absperr- oder Drosselorgan vom Dieselmotor angesaugt wird. Hierdurch wird die unter a) erreichte Höchsttemperatur des Abgases infolge Erhöhung der Ansauglufttemperatur noch weiter hinaufgesetzt.b) air heated in an exhaust gas heat exchanger as a result of Pressure drop behind the shut-off or throttle element from Diesel engine is sucked in. As a result, the under a) Exhaust gas temperature reached due to increase the intake air temperature further increased.

Ein schematisches Zahlenbeispiel soll obige Funktionen er­ klären:A schematic numerical example should he functions above clarify:

Ein Dieselmotor soll sein höchstes Drehmoment mit einer Luftverhältniszahl der Verbrennung von 1,2 erreichen, sein halbes Drehmoment mit 2,4. Bei vollem Drehmoment soll seine Abgastemperatur 450°C betragen, bei halbem Drehmoment ist sie viel niedriger. Durch Verstellen des Absperr- oder Dros­ selorgans wird nun die angesaugte Luftmasse so weit vermindert, daß auch bei halbem Drehmoment die Luftverhältniszahl 1,2 ist. Damit würde schon bei Vernachlässigung der Wirkungsgradver­ schlechterung bei halbem Drehmoment obige Abgastemperatur von 450°C erreicht werden, wenn keine Erwärmung der Ansaug­ luft vorliegt. Da jedoch die Ansaugluft mittels Abgaswärme­ tauschers bis auf 100 oder gar 200°C erwärmt wird, steigt die Abgastemperatur auf 550 bis 650°C an, infolge Verschlech­ terung des Wirkungsgrades noch höher. Damit wird der Ruß mit Sicherheit gezündet und das Filter kann abbrennen. Dies er­ folgt umso schneller, je mehr nach dem Zünden das Absperr- oder Drosselorgan geöffnet wird. Der Zündvorgang kann durch Erreichen eines bestimmten Abgasstaudrucks vor dem Rußpar­ tikelfilter oder auf andere Weise eingeleitet werden.A diesel engine is said to have its highest torque with a Air ratio of combustion can reach 1.2 half torque with 2.4. At full torque its Exhaust gas temperature is 450 ° C, at half the torque them much lower. By adjusting the shut-off or throttle selorgans the air mass sucked in is reduced so far, that the air ratio is 1.2 even at half the torque. This would reduce the efficiency ver deterioration at half torque above exhaust gas temperature of 450 ° C can be reached if there is no heating of the intake air is present. However, since the intake air uses exhaust heat exchanger is heated to 100 or even 200 ° C, increases the exhaust gas temperature to 550 to 650 ° C due to deterioration efficiency even higher. So that the soot with Safety ignited and the filter can burn. This he follows the faster the more the shut-off or throttle body is opened. The ignition process can be done by Reaching a certain exhaust gas pressure before the soot par particle filter or otherwise initiated.

Claims (1)

Vorrichtung zum Erhöhen der Abgastemperatur eines Diesel­ motors auf mindestens Zündtemperatur der Rußschicht auf dem Rußpartikelfilter, gekennzeichnet durch ein Absperr- oder Drosselorgan in der Luftansaugleitung des Motors. In Strö­ mungsrichtung hinter diesem Absperr- oder Drosselorgan führt eine zweite Leitung Luft, die an einem Abgaswärme­ tauscher erhitzt worden ist, in die Ansaugleitung. Die Masse dieser erhitzten Luft wird durch den Druckabfall am Absperr- oder Drosselorgan einerseits und in Abgaswärme­ tauscher mit Heißluftleitung andererseits bestimmt. Druckabfall an Absperr- oder Drosselorgan und Druckabfall in Abgaswärmetauscher mit Heißluftleitung sind so aufeinan­ der abgestimmt, daß zum Erreichen der benötigten Abgas­ temperaturen der erforderliche Mindestluftbedarf nicht unterschritten wird.Device for increasing the exhaust gas temperature of a diesel engine to at least the ignition temperature of the soot layer on the soot particle filter, characterized by a shut-off or throttle element in the air intake line of the engine. In the flow direction behind this shut-off or throttle element, a second line of air that has been heated by an exhaust gas heat exchanger leads into the intake line. The mass of this heated air is determined by the pressure drop on the shut-off or throttle element on the one hand and in exhaust gas heat exchangers with a hot air line on the other. Pressure drop at the shut-off or throttle element and pressure drop in the exhaust gas heat exchanger with hot air line are matched to one another in such a way that the required minimum air requirement is not undercut to achieve the required exhaust gas temperatures.
DE4000062A 1990-01-03 1990-01-03 Igniting soot particles on diesel filter - involves use of air warmed by exhaust gas heat exchanger Withdrawn DE4000062A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4000062A DE4000062A1 (en) 1990-01-03 1990-01-03 Igniting soot particles on diesel filter - involves use of air warmed by exhaust gas heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4000062A DE4000062A1 (en) 1990-01-03 1990-01-03 Igniting soot particles on diesel filter - involves use of air warmed by exhaust gas heat exchanger

Publications (1)

Publication Number Publication Date
DE4000062A1 true DE4000062A1 (en) 1991-07-04

Family

ID=6397578

Family Applications (1)

Application Number Title Priority Date Filing Date
DE4000062A Withdrawn DE4000062A1 (en) 1990-01-03 1990-01-03 Igniting soot particles on diesel filter - involves use of air warmed by exhaust gas heat exchanger

Country Status (1)

Country Link
DE (1) DE4000062A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111399A1 (en) * 2003-06-18 2004-12-23 Volvo Lastvagnar Ab Apparatus for adjusting the temperature of exhaust gases

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111399A1 (en) * 2003-06-18 2004-12-23 Volvo Lastvagnar Ab Apparatus for adjusting the temperature of exhaust gases

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