EP1664498A1 - Exhaust gas aftertreatment device for diesel engines of vehicles, preferably passenger cars - Google Patents

Exhaust gas aftertreatment device for diesel engines of vehicles, preferably passenger cars

Info

Publication number
EP1664498A1
EP1664498A1 EP04762688A EP04762688A EP1664498A1 EP 1664498 A1 EP1664498 A1 EP 1664498A1 EP 04762688 A EP04762688 A EP 04762688A EP 04762688 A EP04762688 A EP 04762688A EP 1664498 A1 EP1664498 A1 EP 1664498A1
Authority
EP
European Patent Office
Prior art keywords
pump
exhaust gas
housing
sensor
injection valve
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Withdrawn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
EP04762688A
Other languages
German (de)
French (fr)
Inventor
Roland Meyer
Dieter Maisch
Stefan Klotz
Wolfgang Stephan
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.)
Hilite Germany GmbH
Original Assignee
Hydraulik Ring 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 Hydraulik Ring GmbH filed Critical Hydraulik Ring GmbH
Publication of EP1664498A1 publication Critical patent/EP1664498A1/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Withdrawn legal-status Critical Current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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • 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

Definitions

  • Exhaust aftertreatment device for diesel engines of vehicles preferably cars
  • the invention relates to an exhaust gas aftertreatment device for diesel engines of vehicles, preferably cars, according to the preamble of claim 1.
  • Such exhaust gas aftertreatment devices are mainly used in trucks to treat the exhaust gases generated by the diesel engines so that the nitrogen oxides (NO, N0 2 ) are at least partially bound.
  • a pump is provided which conveys a 32.5% urea-water solution as an exhaust gas aftertreatment medium from a storage tank and feeds it to the injection valve under a certain pressure. It doses the required amount of urea-water solution into a pressure-controlled air flow. It is taken from the vehicle electrical system for trucks. For a car, the compressed air must be provided via a separate air compressor. The air flow entrains the injected urea-water solution.
  • the resulting emulsion is fed through an aerosol line to the injection nozzle on the exhaust pipe, where it is injected into the exhaust pipe in front of the catalytic converter.
  • the controls, the various sensors, the injection nozzle on the exhaust pipe or the pumps are sometimes far apart. Therefore, these individual components must be linked via a cable harness and the cables to all of these components must be pulled. Often the cables have to be routed near the exhaust, where the temperatures are high.
  • the invention has for its object to design the generic exhaust gas aftertreatment device so that it can be easily installed in the vehicle with a simple structure.
  • At least the pump and the control are combined to form one installation unit.
  • the complex laying of cables between these components can be omitted, so that the device can be easily installed.
  • the invention is explained in more detail using an exemplary embodiment shown in the drawing.
  • the drawing shows an exhaust gas aftertreatment device according to the invention in a schematic representation.
  • the nitrogen oxides (NO, N0 2 ) are reduced by a catalytic converter for the exhaust aftertreatment of diesel engines in trucks and passenger cars.
  • a solution is used for this, which is introduced into the exhaust gas flow of the diesel engine.
  • 32.5% urea-water solution, which is accommodated in a storage container 1, is advantageously used as the solution. It is located in a tank 2 for diesel fuel.
  • a discharge line 3 projects into the storage container 1 and is advantageously connected to a filter 4 within the storage container 1.
  • the discharge line 3 passes through seals the reservoir 1 and is connected to a line 5 on the wall of the tank 2. It branches to a pump block 6, which has two pump units 7 and 8 connected in parallel.
  • a check valve 9, 10, which prevents the medium from flowing back into the reservoir 1, is connected upstream of both pump units 7, 8.
  • the two pump units 7, 8 are connected to an electrical / electronic control 11.
  • the medium With the pump units 7, 8, the medium is fed via an outlet line 12, 13 to a delivery line 14, in which the medium reaches a switching valve 15.
  • a switching valve 15 In each of the outlet lines 12, 13 there is a check valve 16, 17 which blocks against the pump units 7, 8.
  • the switching valve 15 is also connected to the controller 11.
  • the pressure of the medium in the delivery line 14 is monitored by a pressure sensor 18 which is connected to the controller 11.
  • the switching valve 15 assumes its blocking position, so that the medium cannot get in the direction of a throttle point 20 provided on an exhaust pipe 19.
  • the throttle point 20 is part of an injection valve 25, with which the exhaust gas treatment medium can be injected into the exhaust pipe 19.
  • the exhaust gases flowing through the exhaust pipe 19 take up the sprayed-in exhaust gas treatment medium.
  • the switching valve 15, controlled by the controller 11 is switched to its open position, the exhaust gas aftertreatment medium flows from the delivery line 14 through the switching valve 15 into a delivery line 21, which is advantageously designed as an expansion hose.
  • the delivery line 21 is connected to the throttle valve 20.
  • the temperature of the exhaust gas in the exhaust pipe 19 is measured by a temperature sensor 22, which is connected to the controller 11 via a bus 23, preferably a CAN bus.
  • the delivery line 21 is preferably heatable.
  • a heating device 24 is provided, which can be provided on the delivery line 21 or can be integrated into it. This heating device 24 is also connected to the controller 11.
  • the injection valve 25 can optionally be provided with a check valve 26 which blocks against the delivery line 21.
  • the functional safety of the injection valve 25 is improved by the check valve 26.
  • the electrical system 27 of the motor vehicle is connected to the controller 11.
  • the controller 11 sits on a housing 28 in which the pump 6, its pressure sensor 18 and the switching valve 15 are accommodated.
  • the housing 28 itself is part of an installation unit 31, which in turn is part of a metering unit 29, which is indicated in the drawing by a dashed line.
  • the metering unit 29 contains, in addition to the installation unit 31 with the control 11, the injection valve 25.
  • the essential components of the metering unit 29 are accommodated in the housing 28, long cable runs to the individual components of the aftertreatment device can be dispensed with.
  • the control 11 itself is provided on the housing 28 and can optionally also be integrated into the housing 28.
  • the essential components of the aftertreatment device are arranged very close together. In the housing 28, these parts are protected from destruction, for example by frost.
  • the electrically heatable expansion hose 21 leads from the housing 28 of the metering or installation unit 31 to the injection valve 25 at the injection point on the exhaust pipe 19.
  • the exhaust gas treatment medium is metered into the exhaust gas flowing in the exhaust pipe 19 via the injection valve 25.
  • the additional volume occurring due to the freezing process can be pressed into the exhaust pipe 19 via the injection valve 25 if it is not taken up by the heatable expansion hose 21.
  • a pump magnet coil of the pump 6 can be energized continuously without the pump delivering.
  • the associated heating can be used to thaw the installation unit 31. This eliminates the need for a separate connection to the vehicle cooling system, which would otherwise be necessary for thawing.
  • the expansion hose 21 is heated in the manner described, so that the exhaust gas treatment medium flowing through the expansion hose is heated.
  • the injection valve 25 is also heated to such an extent that any frozen exhaust gas treatment medium may thaw. The most If the injector 25 is provided, the injector 30 can be reliably heated in this way so that it does not freeze up.
  • the pump 6 can be used as a heating element in the manner described by continuously energizing its magnet coil, so that the medium frozen in the pump is thawed.
  • the installation unit 31 with the housing 28 is advantageously mounted directly on the tank 2, so that an additional external suction line for the exhaust gas treatment medium is not required.
  • the exhaust gas aftertreatment device is advantageously provided for passenger vehicles in which a compressed air network - in contrast to trucks - is not available, the exhaust gas treatment medium can be metered into the exhaust gas stream in the exhaust pipe 19 without problems in the manner described.
  • the exhaust gas aftertreatment device described is frost-proof, has a compact design and is inexpensive to produce. The device can also be used for trucks.

Abstract

Disclosed is an exhaust gas aftertreatment device for diesel engines of vehicles, preferably passenger cars. Said exhaust gas aftertreatment device comprises a pump (6) for the exhaust gas aftertreatment medium, sensors (18, 22), an injection valve (25), and a control mechanism (11) for the pump (6), the sensors (18, 22), and the injection valve (25). Some of said components lie far apart such that they have to be connected via a wire harness. In addition, the wires often have to be laid near the exhaust pipe, where temperatures are high. In order to be able to install the inventive device without any problems while keeping the design simple, at least the pump (6) and the control mechanism (11) are combined into a built-in unit, thus dispensing with the effort of laying wires between the components. The inventive device is used in diesel engines.

Description

Abgasnachbehandlungseinrichtung für Dieselmotoren von Fahrzeugen, vorzugsweise von PKWs Exhaust aftertreatment device for diesel engines of vehicles, preferably cars
Die Erfindung betrifft eine Abgasnachbehandlungseinrichtung für Dieselmotoren von Fahrzeugen, vorzugsweise von PKWs, nach dem Oberbegriff des Anspruches 1.The invention relates to an exhaust gas aftertreatment device for diesel engines of vehicles, preferably cars, according to the preamble of claim 1.
Solche Abgasnachbehandlungseinrichtungen werden hauptsächlich in Lastkraftwagen eingesetzt, um die von den Dieselmotoren erzeugten Abgase so zu behandeln, daß die Stickoxide (NO, N02) zumindest teilweise gebunden werden. Hierzu ist eine Pumpe vorgesehen, die eine 32,5 %-ige Harnstoff-Wasser-Lösung als Abgasnachbehandlungsmedium aus einem Vorratstank fördert und unter einem bestimmten Druck dem Einspritzventil zuführt. Es dosiert die benötigte Menge an Harnstoff-Wasser-Lösung in einen druckgeregelten Luftstrom ein. Er wird bei LKWs dem Fahrzeugbordnetz entnommen. Für einen PKW muß die Druckluft über einen gesonderten Luftkompressor bereitgestellt werden. Der Luftstrom reißt die eingespritzte Harnstoff-Wasser-Lösung mit. Die auf diese Weise entstehende Emulsion wird über eine Aerosolleitung zur Einspritzdüse am Abgasrohr geführt und dort vor dem Katalysator in das Abgasrohr eingedüst. Die Steuerung, die verschiedenen Sensoren, die Einspritzdüse am Abgasrohr oder die Pumpen liegen räumlich zum Teil weit auseinander. Darum müssen diese einzelnen Komponenten über einen Kabelbaum verknüpft und die Kabel zu allen diesen Komponenten gezogen werden. Häufig müssen die Kabel hierbei in der Nähe des Auspuffes verlegt werden, wo hohe Temperaturen herrschen. Der Erfindung liegt die Aufgabe zugrunde, die gattungsgemäße Ab- gasnachbehandlungseinrichtung so auszubilden, daß sie bei einfachem Aufbau einfach in das Fahrzeug eingebaut werden kann.Such exhaust gas aftertreatment devices are mainly used in trucks to treat the exhaust gases generated by the diesel engines so that the nitrogen oxides (NO, N0 2 ) are at least partially bound. For this purpose, a pump is provided which conveys a 32.5% urea-water solution as an exhaust gas aftertreatment medium from a storage tank and feeds it to the injection valve under a certain pressure. It doses the required amount of urea-water solution into a pressure-controlled air flow. It is taken from the vehicle electrical system for trucks. For a car, the compressed air must be provided via a separate air compressor. The air flow entrains the injected urea-water solution. The resulting emulsion is fed through an aerosol line to the injection nozzle on the exhaust pipe, where it is injected into the exhaust pipe in front of the catalytic converter. The controls, the various sensors, the injection nozzle on the exhaust pipe or the pumps are sometimes far apart. Therefore, these individual components must be linked via a cable harness and the cables to all of these components must be pulled. Often the cables have to be routed near the exhaust, where the temperatures are high. The invention has for its object to design the generic exhaust gas aftertreatment device so that it can be easily installed in the vehicle with a simple structure.
Diese Aufgabe wird bei der gattungsgemäßen Abgasnachbehandlungseinrichtung erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruches 1 gelöst.This object is achieved in the generic exhaust gas aftertreatment device according to the invention with the characterizing features of claim 1.
Bei der erfindungsgemäßen Abgasnachbehandlungseinrichtung sind zumindest die Pumpe und die Steuerung zu einer Einbaueinheit zusammengefaßt. Das aufwendige Verlegen von Kabeln zwischen diesen Komponenten kann dadurch entfallen, so daß die Einrichtung einfach eingebaut werden kann.In the exhaust gas aftertreatment device according to the invention, at least the pump and the control are combined to form one installation unit. The complex laying of cables between these components can be omitted, so that the device can be easily installed.
Weitere Merkmale der Erfindung ergeben sich aus den weiteren Ansprüchen, der Beschreibung und der Zeichnung.Further features of the invention result from the further claims, the description and the drawing.
Die Erfindung wird anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Die Zeichnung zeigt eine erfindungsgemäße Abgasnachbehandlungseinrichtung in schematischer Darstellung.The invention is explained in more detail using an exemplary embodiment shown in the drawing. The drawing shows an exhaust gas aftertreatment device according to the invention in a schematic representation.
Für die Abgasnachbehandlung von Dieselmotoren in Lastkraftwagen und Personenkraftwagen werden die Stickoxide (NO, N02) durch einen Katalysator reduziert. Hierfür wird eine Lösung verwendet, die in den Abgasstrom des Dieselmotors eingeführt wird. Als Lösung wird vorteilhaft 32,5 %-ige Harnstoff-Wasser-Lösung verwendet, die in einem Vorratsbehälter 1 untergebracht ist. Er befindet sich in einem Tank 2 für Dieselkraftstoff. In den Vorratsbehälter 1 ragt eine Austragleitung 3, die innerhalb des Vorratsbehälters 1 vorteilhaft an einen Filter 4 angeschlossen ist. Die Austragleitung 3 durchsetzt abge- dichtet den Vorratsbehälter 1 und ist an der Wandung des Tanks 2 an eine Leitung 5 angeschlossen. Sie verzweigt zu einem Pumpenblock 6, der zwei parallelgeschaltete Pumpeneinheiten 7 und 8 aufweist. Beiden Pumpeneinheiten 7, 8 ist jeweils ein Rückschlagventil 9, 10 vorgeschaltet, das einen Rückfluß des Mediums in den Vorratsbehälter 1 verhindert. Die beiden Pumpeneinheiten 7, 8 sind an eine elektrische/elektronische Steuerung 11 angeschlossen.The nitrogen oxides (NO, N0 2 ) are reduced by a catalytic converter for the exhaust aftertreatment of diesel engines in trucks and passenger cars. A solution is used for this, which is introduced into the exhaust gas flow of the diesel engine. 32.5% urea-water solution, which is accommodated in a storage container 1, is advantageously used as the solution. It is located in a tank 2 for diesel fuel. A discharge line 3 projects into the storage container 1 and is advantageously connected to a filter 4 within the storage container 1. The discharge line 3 passes through seals the reservoir 1 and is connected to a line 5 on the wall of the tank 2. It branches to a pump block 6, which has two pump units 7 and 8 connected in parallel. A check valve 9, 10, which prevents the medium from flowing back into the reservoir 1, is connected upstream of both pump units 7, 8. The two pump units 7, 8 are connected to an electrical / electronic control 11.
Mit den Pumpeneinheiten 7, 8 wird das Medium über jeweils eine Auslaßleitung 12, 13 einer Förderleitung 14 zugeführt, in der das Medium zu einem Schaltventil 15 gelangt. In den Auslaßleitungen 12, 13 sitzt jeweils ein Rückschlagventil 16, 17, das gegen die Pumpeneinheiten 7, 8 sperrt. Das Schaltventil 15 ist ebenfalls an die Steuerung 11 angeschlossen.With the pump units 7, 8, the medium is fed via an outlet line 12, 13 to a delivery line 14, in which the medium reaches a switching valve 15. In each of the outlet lines 12, 13 there is a check valve 16, 17 which blocks against the pump units 7, 8. The switching valve 15 is also connected to the controller 11.
Der Druck des Mediums in der Förderleitung 14 wird durch einen Drucksensor 18 überwacht, der an die Steuerung 11 angeschlossen ist.The pressure of the medium in the delivery line 14 is monitored by a pressure sensor 18 which is connected to the controller 11.
In der Zeichnung nimmt das Schaltventil 15 seine Sperrstellung ein, so daß das Medium nicht in Richtung auf eine an einem Abgasrohr 19 vorgesehene Drosselstelle 20 gelangen kann. Die Drosselstelle 20 ist Bestandteil eines Einspritzventils 25, mit dem das Abgasbehandlungsmedium in das Abgasrohr 19 eingespritzt werden kann. Die durch das Abgasrohr 19 strömenden Abgase nehmen das eingesprühte Abgasbehandlungsmedium auf. Wird das Schaltventil 15, gesteuert durch die Steuerung 11 , in seine Durchlaßstellung geschaltet, strömt das Abgasnachbehandlungsmedium von der Förderleitung 14 durch das Schaltventil 15 in eine Förderleitung 21 , die vorteilhaft als Dehnschlauch ausgebildet ist. Die Förderleitung 21 ist an das Drosselventil 20 angeschlossen. Die Temperatur des Abgases im Abgasrohr 19 wird durch einen Temperatursensor 22 gemessen, der über einen Bus 23, vorzugsweise einen CAN-Bus, an die Steuerung 11 angeschlossen ist.In the drawing, the switching valve 15 assumes its blocking position, so that the medium cannot get in the direction of a throttle point 20 provided on an exhaust pipe 19. The throttle point 20 is part of an injection valve 25, with which the exhaust gas treatment medium can be injected into the exhaust pipe 19. The exhaust gases flowing through the exhaust pipe 19 take up the sprayed-in exhaust gas treatment medium. If the switching valve 15, controlled by the controller 11, is switched to its open position, the exhaust gas aftertreatment medium flows from the delivery line 14 through the switching valve 15 into a delivery line 21, which is advantageously designed as an expansion hose. The delivery line 21 is connected to the throttle valve 20. The temperature of the exhaust gas in the exhaust pipe 19 is measured by a temperature sensor 22, which is connected to the controller 11 via a bus 23, preferably a CAN bus.
Die Förderleitung 21 ist vorzugsweise beheizbar. In diesem Falle ist eine Heizeinrichtung 24 vorgesehen, die an der Förderleitung 21 vorgesehen oder in sie integriert sein kann. Diese Heizeinrichtung 24 ist ebenfalls an die Steuerung 11 angeschlossen.The delivery line 21 is preferably heatable. In this case, a heating device 24 is provided, which can be provided on the delivery line 21 or can be integrated into it. This heating device 24 is also connected to the controller 11.
Das Einspritzventil 25 kann optional mit einem Rückschlagventil 26 versehen sein, das gegen die Förderleitung 21 sperrt. Durch das Rückschlagventil 26 wird die Funktionssicherheit des Einspritzventils 25 verbessert.The injection valve 25 can optionally be provided with a check valve 26 which blocks against the delivery line 21. The functional safety of the injection valve 25 is improved by the check valve 26.
An die Steuerung 11 ist das elektrische Bordnetz 27 des Kraftfahrzeuges angeschlossen. Die Steuerung 11 sitzt auf einem Gehäuse 28, in dem die Pumpe 6, deren Drucksensor 18 und das Schaltventil 15 untergebracht sind. Das Gehäuse 28 selbst ist Bestandteil einer Einbaueinheit 31 , die ihrerseits Teil einer Dosiereinheit 29 ist, die in der Zeichnung durch eine gestrichelte Linie gekennzeichnet ist. Die Dosiereinheit 29 enthält zusätzlich zur Einbaueinheit 31 mit der Steuerung 11 das Einspritzventil 25.The electrical system 27 of the motor vehicle is connected to the controller 11. The controller 11 sits on a housing 28 in which the pump 6, its pressure sensor 18 and the switching valve 15 are accommodated. The housing 28 itself is part of an installation unit 31, which in turn is part of a metering unit 29, which is indicated in the drawing by a dashed line. The metering unit 29 contains, in addition to the installation unit 31 with the control 11, the injection valve 25.
Da die wesentlichen Bestandteile der Dosiereinhiet 29 im Gehäuse 28 untergebracht sind, kann auf lange Kabelführungen zu den Einzelkomponenten der Nachbehandlungseinrichtung verzichtet werden. Hierzu trägt wesentlich bei, daß die Steuerung 11 selbst am Gehäuse 28 vorgesehen ist und gegebenenfalls auch in das Gehäuse 28 integriert sein kann. Somit sind die wesentlichen Bestandteile der Nachbehandlungseinrichtung räumlich sehr nah beieinander angeordnet. Im Gehäuse 28 sind diese Teile vor einer Zerstörung beispielsweise durch Frost geschützt.Since the essential components of the metering unit 29 are accommodated in the housing 28, long cable runs to the individual components of the aftertreatment device can be dispensed with. An important contribution to this is that the control 11 itself is provided on the housing 28 and can optionally also be integrated into the housing 28. Thus, the essential components of the aftertreatment device are arranged very close together. In the housing 28, these parts are protected from destruction, for example by frost.
An der Steuerung 11 müssen lediglich die Anschlußmöglichkeiten für das elektrische Bordnetz 27, für die Busleitung 23 und für die Heizeinrichtung 24 der Förderleitung 21 vorgesehen sein.Only the connection options for the electrical system 27, for the bus line 23 and for the heating device 24 of the delivery line 21 must be provided on the control 11.
Vom Gehäuse 28 der Dosier- bzw. Einbaueinheit 31 führt der elektrisch beheizbare Dehnschlauch 21 zum Einspritzventil 25 an der Einspritzstelle am Abgasrohr 19. Über das Einspritzventil 25 wird das Abgasbehandlungsmedium in das im Abgasrohr 19 strömende Abgas eindosiert.The electrically heatable expansion hose 21 leads from the housing 28 of the metering or installation unit 31 to the injection valve 25 at the injection point on the exhaust pipe 19. The exhaust gas treatment medium is metered into the exhaust gas flowing in the exhaust pipe 19 via the injection valve 25.
Wenn bei tiefen Außentemperaturen das Abgasbehandlungsmedium einfriert, kann das durch den Einfriervorgang auftretende zusätzliche Volumen über das Einspritzventil 25 in das Abgasrohr 19 gedrückt werden, falls es nicht vom beheizbaren Dehnschlauch 21 aufgenommen wird.If the exhaust gas treatment medium freezes at low outside temperatures, the additional volume occurring due to the freezing process can be pressed into the exhaust pipe 19 via the injection valve 25 if it is not taken up by the heatable expansion hose 21.
Innerhalb des Gehäuses 28 der Einbaueinheit 31 kann eine Pum- penmagnetspule der Pumpe 6 elektrisch dauerbestromt werden, ohne daß die Pumpe fördert. Die damit verbundene Erwärmung kann zum Auftauen der Einbaueinheit 31 herangezogen werden. Dadurch kann ein separater Anschluß an das Fahrzeugkühlsystem, der zum Auftauen ansonsten nötig wäre, entfallen.Within the housing 28 of the installation unit 31, a pump magnet coil of the pump 6 can be energized continuously without the pump delivering. The associated heating can be used to thaw the installation unit 31. This eliminates the need for a separate connection to the vehicle cooling system, which would otherwise be necessary for thawing.
Außerhalb des Gehäuses 28 wird der Dehnschlauch 21 in der beschriebenen Weise beheizt, so daß das durch den Dehnschlauch strömende Abgasbehandlungsmedium erwärmt wird. Dies hat zur Folge, daß auch das Einspritzventil 25 so weit erwärmt wird, daß eventuell gefrorenes Abgasbehandlungsmedium auftaut. Die am Aus- tritt des Einspritzventils 25 vorgesehene Einspritzdüse 30 kann auf diese Weise zuverlässig so erwärmt werden, daß sie nicht zufriert.Outside the housing 28, the expansion hose 21 is heated in the manner described, so that the exhaust gas treatment medium flowing through the expansion hose is heated. As a result, the injection valve 25 is also heated to such an extent that any frozen exhaust gas treatment medium may thaw. The most If the injector 25 is provided, the injector 30 can be reliably heated in this way so that it does not freeze up.
Da die in der Dosiereinheit befindlichen Komponenten räumlich sehr eng zusammenliegen, sind auch die entsprechenden Leitungen, die zwischen der Steuerung 11 und diesen Komponenten notwendig sind, nur kurz. Dadurch kann ein Kabelbaum entfallen. Alle elektrisch anzusteuernden Komponenten werden im Gehäuse 28 bzw. in der Do- \ siereinheit 29 elektrisch über Stanzgitter oder flexible Kontaktfolien kontaktiert. Eine elektrische Leitung zum Abgasrohr 19 für den Drucksensor 18 ist nicht erforderlich, da er im Gehäuse 28 selbst untergebracht ist. Die Pumpe 6 kann bei eingefrorenem Abgasbehandlungsmedium in der beschriebenen Weise durch Dauerbestromung ihrer Magnetspule als Heizelement benutzt werden, so daß das in der Pumpe eingefrorene Medium aufgetaut wird.Since the components located in the dosing unit are very close together in space, the corresponding lines that are necessary between the controller 11 and these components are only short. This eliminates the need for a wiring harness. All components to be controlled electrically are contacted electrically in the housing 28 or in the metering unit 29 via lead frames or flexible contact foils. An electrical line to the exhaust pipe 19 for the pressure sensor 18 is not necessary since it is housed in the housing 28 itself. When the exhaust gas treatment medium is frozen, the pump 6 can be used as a heating element in the manner described by continuously energizing its magnet coil, so that the medium frozen in the pump is thawed.
Vorteilhaft wird die Einbaueinheit 31 mit dem Gehäuse 28 unmittelbar auf dem Tank 2 montiert, so daß eine zusätzliche externe Ansaugleitung für das Abgasbehandlungsmedium nicht erforderlich ist.The installation unit 31 with the housing 28 is advantageously mounted directly on the tank 2, so that an additional external suction line for the exhaust gas treatment medium is not required.
Da die Abgasnachbehandlungseinrichtung vorteilhaft für Personenkraftfahrzeuge vorgesehen ist, in denen ein Druckluftnetz - im Gegensatz zu Lastkraftwagen - nicht zur Verfügung steht, läßt sich das Abgasbehandlungsmedium in der beschriebenen Weise ohne Probleme druckluftfrei dem Abgasstrom im Abgasrohr 19 zudosieren.Since the exhaust gas aftertreatment device is advantageously provided for passenger vehicles in which a compressed air network - in contrast to trucks - is not available, the exhaust gas treatment medium can be metered into the exhaust gas stream in the exhaust pipe 19 without problems in the manner described.
Längs des Abgasrohres 19, das im Betrieb sehr heiß wird, ist kein Kabel oder eine elektrische Leitung vorgesehen. Die beschriebene Abgasnachbehandlungseinrichtung ist frostsicher, hat eine kompakte Ausbildung und ist kostengünstig herstellbar. Die Vorrichtung kann auch für LKWs eingesetzt werden. No cable or electrical line is provided along the exhaust pipe 19, which becomes very hot during operation. The exhaust gas aftertreatment device described is frost-proof, has a compact design and is inexpensive to produce. The device can also be used for trucks.

Claims

Ansprüche Expectations
1. Abgasnachbehandlungseinrichtung für Dieselmotoren von Fahrzeugen, insbesondere von PKWs, mit wenigstens einer Pumpe für ein Abgasnachbehandlungsmedium, mit wenigstens einem Sensor, mit wenigstens einem Einspritzventil mit einer Einspritzdüse, über die das Abgasnachbehandlungsmedium in ein Abgasrohr gelangt, und mit wenigstens einer Steuerung, an die die Pumpe, der Sensor und das Einspritzventil angeschlossen sind, dadurch gekennzeichnet, daß zumindest die Pumpe (6) und die Steuerung (11) zu einer Einbaueinheit (31) zusammengefaßt sind.1.Exhaust aftertreatment device for diesel engines of vehicles, in particular cars, with at least one pump for an exhaust aftertreatment medium, with at least one sensor, with at least one injection valve with an injection nozzle, through which the exhaust aftertreatment medium enters an exhaust pipe, and with at least one controller to which the pump, the sensor and the injection valve are connected, characterized in that at least the pump (6) and the control (11) are combined to form an installation unit (31).
2. Einrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß die Einbaueinheit (31) den Sensor (18) aufweist.2. Device according to claim 1, characterized in that the installation unit (31) has the sensor (18).
3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Einbaueinheit (31) das Einspritzventil (25) aufweist.3. Device according to claim 1 or 2, characterized in that the installation unit (31) has the injection valve (25).
4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Pumpe (6) und/oder der Sensor (18) und/oder das Einspritzventil (25) innerhalb der Einbaueinheit (31) mit der Steuerung (11) elektrisch verbunden sind.4. Device according to one of claims 1 to 3, characterized in that the pump (6) and / or the sensor (18) and / or the injection valve (25) within the mounting unit (31) with the controller (11) electrically connected are.
5. Einrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Einbaueinheit (31) ein Gehäuse (28) aufweist, in dem die Pumpe (6) untergebracht ist. 5. Device according to one of claims 1 to 4, characterized in that the installation unit (31) has a housing (28) in which the pump (6) is housed.
6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, daß im Gehäuse (28) der Sensor (18) untergebracht ist.6. Device according to claim 5, characterized in that the sensor (18) is housed in the housing (28).
7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß der Sensor (18) ein Drucksensor ist.7. Device according to claim 6, characterized in that the sensor (18) is a pressure sensor.
8. Einrichtung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß im Gehäuse (28) ein Schaltventil (15) untergebracht ist.8. Device according to one of claims 5 to 7, characterized in that a switching valve (15) is housed in the housing (28).
9. Einrichtung nach Anspruch 8, dadurch gekennzeichnet, daß das Schaltventil (15) dem Einspritzventil (25) vorgeschaltet ist.9. Device according to claim 8, characterized in that the switching valve (15) is connected upstream of the injection valve (25).
10. Einrichtung nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, daß die Steuerung (1 1 ) am Gehäuse (28) vorgesehen ist.10. Device according to one of claims 5 to 9, characterized in that the controller (1 1) is provided on the housing (28).
1 1. Einrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Steuerung (1 1) einen Anschluß für das Bordnetz des Fahrzeuges aufweist.1 1. Device according to one of claims 1 to 10, characterized in that the controller (1 1) has a connection for the vehicle electrical system.
12. Einrichtung nach einem der Ansprüche 1 bis 1 1 , dadurch gekennzeichnet, daß die Steuerung (1 1) einen Anschluß für mindestens einen außerhalb des Gehäuses (28) angeordneten weiteren Sensor (22), vorzugsweise einen Temperatursensor, aufweist. 12. Device according to one of claims 1 to 1 1, characterized in that the controller (1 1) has a connection for at least one outside of the housing (28) arranged further sensor (22), preferably a temperature sensor.
13. Einrichtung nach einem der Ansprüche 5 bis 12, dadurch gekennzeichnet, daß das Einspritzventil (25) über einen Dehnschlauch (21) mit dem Gehäuse (28) verbunden ist.13. Device according to one of claims 5 to 12, characterized in that the injection valve (25) via an expansion hose (21) is connected to the housing (28).
14. Einrichtung nach Anspruch 13, dadurch gekennzeichnet, daß der Dehnschlauch (21) beheizbar ist.14. Device according to claim 13, characterized in that the expansion hose (21) is heatable.
15. Einrichtung nach einem der Ansprüche 5 bis 14, dadurch gekennzeichnet, daß das Gehäuse (28) auf einem Tank (2) für den Dieselkraftstoff sitzt.15. Device according to one of claims 5 to 14, characterized in that the housing (28) sits on a tank (2) for the diesel fuel.
16. Einrichtung nach einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, daß das Einspritzventil (25) ein in Richtung auf die Einspritzdüse (30) öffnendes Rückschlagventil (26) aufweist.16. Device according to one of claims 1 to 15, characterized in that the injection valve (25) has a check valve (26) opening in the direction of the injection nozzle (30).
17. Einrichtung nach Anspruch 16, dadurch gekennzeichnet, daß dem Rückschlagventil (26) eine Drosselstelle (20) nachgeschaltet ist.17. The device according to claim 16, characterized in that the check valve (26) is followed by a throttle point (20).
18. Einrichtung nach einem der Ansprüche 1 bis 17, dadurch gekennzeichnet, daß die Einbaueinheit (31) Teil einer Dosiereinheit (29) ist.18. Device according to one of claims 1 to 17, characterized in that the installation unit (31) is part of a metering unit (29).
19. Einrichtung nach Anspruch 18, dadurch gekennzeichnet, daß der weitere Sensor (22) im Bereich außerhalb der Einbaueinheit (31) angeordnet ist. 19. The device according to claim 18, characterized in that the further sensor (22) is arranged in the region outside the installation unit (31).
0. Einrichtung nach Anspruch 18 oder 19, dadurch gekennzeichnet, daß die Dosiereinheit (29) mit der Einbaueinheit (31) ein Einbaumodul bildet. 0. Device according to claim 18 or 19, characterized in that the metering unit (29) with the installation unit (31) forms an installation module.
EP04762688A 2003-09-02 2004-08-19 Exhaust gas aftertreatment device for diesel engines of vehicles, preferably passenger cars Withdrawn EP1664498A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10341996A DE10341996A1 (en) 2003-09-02 2003-09-02 Exhaust after-treatment device for diesel engines of vehicles, preferably of passenger cars
PCT/DE2004/001847 WO2005024196A1 (en) 2003-09-02 2004-08-19 Exhaust gas aftertreatment device for diesel engines of vehicles, preferably passenger cars

Publications (1)

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EP1664498A1 true EP1664498A1 (en) 2006-06-07

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US (1) US20060236679A1 (en)
EP (1) EP1664498A1 (en)
JP (1) JP2007504387A (en)
CN (1) CN1846043A (en)
DE (2) DE10341996A1 (en)
WO (1) WO2005024196A1 (en)

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JP2007504387A (en) 2007-03-01
DE10341996A1 (en) 2005-03-24
DE112004002150D2 (en) 2006-07-13
US20060236679A1 (en) 2006-10-26
CN1846043A (en) 2006-10-11
WO2005024196A1 (en) 2005-03-17

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