DE102006033027B4 - Method for operating a metering device of an SCR catalytic converter - Google Patents
Method for operating a metering device of an SCR catalytic converter Download PDFInfo
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- DE102006033027B4 DE102006033027B4 DE102006033027.7A DE102006033027A DE102006033027B4 DE 102006033027 B4 DE102006033027 B4 DE 102006033027B4 DE 102006033027 A DE102006033027 A DE 102006033027A DE 102006033027 B4 DE102006033027 B4 DE 102006033027B4
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- conveyor
- pressure line
- reagent
- drive signal
- filling
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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
- F01N3/08—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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0418—Methods of control or diagnosing using integration or an accumulated value within an elapsed period
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1821—Injector parameters
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1822—Pump parameters
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- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Verfahren zum Betreiben einer Dosiereinrichtung eines SCR-Katalysators zur Reduktion von Stickoxiden in einem Abgasstrom insbesondere einer Brennkraftmaschine, wobei mittels einer Fördereinrichtung (110) über eine Druckleitung (141) ein Reagenzmittel in den Abgasstrom eindosiert wird, dadurch gekennzeichnet, dass zur Bestimmung der in der Druckleitung (141) vorhandenen Menge des Reagenzmittels die Füll- und/oder Entleerrate der Druckleitung (141) aus Betriebsgrößen der Fördereinrichtung (110) bestimmt wird.Method for operating a metering device of an SCR catalytic converter for reducing nitrogen oxides in an exhaust gas stream, in particular of an internal combustion engine, wherein a reagent is metered into the exhaust gas flow by means of a delivery device (110) via a pressure line (141), characterized in that for determining the in Pressure line (141) existing amount of the reagent, the filling and / or emptying rate of the pressure line (141) from operating variables of the conveyor (110) is determined.
Description
Stand der TechnikState of the art
Die Erfindung geht aus von einem Verfahren zum Betreiben einer Dosiereinrichtung eines SCR-Katalysators nach der Gattung des unabhängigen Anspruchs 1.The invention is based on a method for operating a metering device of an SCR catalytic converter according to the preamble of independent claim 1.
Um insbesondere künftige gesetzliche Vorgaben bezüglich der Stickoxidemission von Kraftfahrzeugen zu erfüllen, müssen Abgase einer Abgasbehandlung unterzogen werden. Zur Verringerung von Stickoxidemissionen von Brennkraftmaschinen, insbesondere von Dieselmotoren, aber auch von Benzinmotoren, wird unter anderem das sogenannte Slective-Catalytic-Reduction(SCR)-Verfahren eingesetzt. Hierbei wird dem Abgasstrang eine definierte Menge des Reduktionsmittels Harnstoff bzw. eine Harnstoff-Wasser-Lösung (HWL) zugegeben. Für den stöchiometrischen Umsatz des aus Harnstoff im Abgasstrang generierten Ammoniak mit den im Abgas vorhandenen Stickoxiden, wird die HWL dem Abgasstrang der Brennkraftmaschine zudosiert. Dabei wird in einer ersten Reaktionsstufe, insbesondere im Abgasstrang der in der HWL enthaltene Harnstoff mit Wasser zu Ammoniak und Kohlendioxid hydrolisiert. In einer zweiten Reaktionsstufe reduziert das Ammoniak die im Abgasstrang enthaltenen Stickoxide zu Stickstoff, wobei als Nebenprodukt Wasser erzeugt wird.To meet in particular future legal requirements regarding the nitrogen oxide emissions of motor vehicles, exhaust gases must be subjected to exhaust gas treatment. To reduce nitrogen oxide emissions from internal combustion engines, in particular from diesel engines, but also from gasoline engines, the so-called passive catalytic reduction (SCR) process is used inter alia. In this case, a defined amount of the reducing agent urea or a urea-water solution (HWL) is added to the exhaust gas line. For the stoichiometric conversion of the ammonia generated from urea in the exhaust gas line with the nitrogen oxides present in the exhaust gas, the HWL is added to the exhaust gas line of the internal combustion engine. In this case, in a first reaction stage, in particular in the exhaust gas line, the urea contained in the HWL is hydrolyzed with water to give ammonia and carbon dioxide. In a second reaction stage, the ammonia reduces the nitrogen oxides contained in the exhaust gas to nitrogen, wherein water is generated as a by-product.
Das Reagenzmittel wird dabei von einer auch als Fördermodul bezeichneten Fördereinrichtung, gesteuert von einer Steuereinrichtung, insbesondere dem Steuergerät der Brennkraftmaschine, über eine Druckleitung dem im Abgasstrang der Brennkraftmaschine angeordneten Dosierventil zugeführt und in einem fein zerstäubten Spray-Strahl im Bereich eines SCR-Katalysators einspritzt. Das Leitungssystem umfasst dabei in Kraftfahrzeugen Leitungslängen von mehreren Metern, beispielsweise bei einem Mittelklassefahrzeug 4 bis 5 m.The reagent is thereby fed from a conveyor, also referred to as conveyor module, controlled by a control device, in particular the control unit of the internal combustion engine via a pressure line arranged in the exhaust line of the engine metering valve and injected in a finely atomized spray jet in the range of SCR catalyst. The line system includes in motor vehicles line lengths of several meters, for example, in a mid-range vehicle 4 to 5 m.
Der Gefrierpunkt des Reagenzmittels liegt bei etwa –11°C. Bei Unterschreiten dieser Temperatur muss daher sichergestellt sein, dass das Leitungssystem zwischen der Pumpe, die Teil der Fördereinrichtung ist, und dem Dosierventil so weit entleert wird, dass kein Reduktionsmittel nach dem Abschalten des Systems in den hydraulischen Komponenten gefrieren kann, um so Schäden an dem Fördermodul, den Leitungen und/oder dem Dosierventil zu vermeiden.The freezing point of the reagent is about -11 ° C. When falling below this temperature must therefore be ensured that the line system between the pump, which is part of the conveyor, and the metering valve is emptied so far that no reducing agent can freeze after switching off the system in the hydraulic components, so as to damage the Conveying module to avoid the lines and / or the metering valve.
Aus der
Die
Offenbarung der ErfindungDisclosure of the invention
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Verfahren mit den Merkmalen des unabhängigen Anspruchs 1 hat demgegenüber den Vorteil, dass es eine präzise Erfassung der Menge des sich im Leitungssystem, insbesondere in der Druckleitung, befindlichen Reagenzmittels durch Bestimmung der Füll- und/oder Entleerrate der Drukleitung aus Betriebsgrößen einer Fördereinrichtung der Dosiereinrichtung ermöglicht.The inventive method with the features of independent claim 1 has the advantage that there is a precise detection of the amount of in the line system, in particular in the pressure line, located reagent by determining the filling and / or emptying rate of Drukleitung from operating variables of a conveyor Dosing device allows.
Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im unabhängigen Anspruch angegebenen Verfahrens möglich.The measures listed in the dependent claims advantageous refinements and improvements of the independent claim method are possible.
So wird die Füll- und/oder Entleerrate bevorzugt aus dem Ansteuersignal eines Dosierventils der Fördereinrichtung und dem Ansteuersignal einer Förderpumpe der Fördereinrichtung bestimmt. Es versteht sich hierbei, dass weitere Betriebsgrößen, welche das Volumen einer Reagenzmittel-Fördereinrichtung sowie das Leitungssystem, insbesondere die Druckleitung, charakterisieren und wenigstens eine das Reagenzmittel selbst charakterisierende Größe bei der Bestimmung berücksichtigt werden. Diese Größen sind jedoch nicht veränderlich, sondern unveränderliche, die Fördereinrichtung und das Leitungssystem, insbesondere die Druckleitung, sowie das Reagenzmittel charakterisierende Größen. Das in der Druckleitung vorhandene Reagenzmittel wird damit ausschließlich aus dem variablen Ansteuersignal des Dosierventils sowie dem variablen Ansteuersignal der Förderpumpe bestimmt. Auf diese Weise können Durchflusssensoren oder andere Einrichtungen zur Erfassung des Flusses in der Druckleitung entfallen. Da das Ansteuersignal der Förderpumpe und des Dosierventils der Fördereinrichtung jeweils die Leistung der Pumpe und des Dosierventils charakterisieren, ermöglicht es das erfindungsgemäße Verfahren, auf besonders vorteilhafte Weise bei einem Ausfall oder einer Leistungsschwankung der Pumpe und/oder des Dosierventils sofort zu reagieren und die Füll-/Entleerrate sehr genau zu erfassen.Thus, the filling and / or emptying rate is preferably determined from the drive signal of a metering valve of the conveyor and the drive signal of a feed pump of the conveyor. It is understood here that further operating variables which characterize the volume of a reagent delivery device and the line system, in particular the pressure line, and at least one variable characterizing the reagent itself are taken into account in the determination. However, these variables are not variable, but invariable, the conveyor and the piping system, in particular the pressure line, as well as the reagent characterizing sizes. The present in the pressure line reagent is thus determined solely from the variable drive signal of the metering valve and the variable drive signal of the feed pump. In this way, flow sensors or other means for detecting the flow in the pressure line can be omitted. Since the drive signal of the feed pump and the metering valve of the conveyor in each case characterize the performance of the pump and the metering valve, the method according to the invention makes it possible in a particularly advantageous manner To react immediately to a failure or a power fluctuation of the pump and / or the metering valve and to detect the filling / emptying rate very accurately.
Eine vorteilhafte Ausführungsform sieht vor, dass die Abhängigkeit der Füll-/Entleerrate von dem Ansteuersignal der Förderpumpe und dem Ansteuersignal des Dosierventils der Fördereinrichtung in einem Kennfeld gespeichert sind.An advantageous embodiment provides that the dependence of the filling / emptying rate of the drive signal of the feed pump and the drive signal of the metering valve of the conveyor are stored in a map.
Die in der Druckleitung vorhandene Menge des Reagenzmittels wird bevorzugt durch einen Integrator ermittelt, der das Zeitintegral der Förder-/Entleerrate bildet.The amount of reagent present in the pressure line is preferably determined by an integrator which forms the time integral of the delivery / discharge rate.
Dieser Integrator wird gemäß einer vorteilhaften Ausführungsform beim Eintritt in den Zustand Befüllen/Entleeren initialisiert. Auf diese Weise wird die der Druckleitung zu- oder abgeführte Menge des Reagenzmittels bei jedem Befüll-/Entleervorgang erfasst.This integrator is initialized according to an advantageous embodiment when entering the state filling / emptying. In this way, the amount of the reagent added to or removed from the pressure line is detected during each filling / emptying operation.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert.Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.
Es zeigen:Show it:
Ausführungsformen der ErfindungEmbodiments of the invention
Eine Dosiereinrichtung, dargestellt in
In der Saugleitung
Zur Bestimmung des in der Druckleitung
In
Beim Eintritt in den Zustand Befüllen wird hierzu ein Integrator
Sofern ein Entleeren der Druckleitung
Zu erwähnen ist an dieser Stelle noch, dass das Ansteuersignal
Der so ermittelte Füllstand in der Druckleitung
Claims (5)
Priority Applications (1)
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DE102006033027.7A DE102006033027B4 (en) | 2006-07-17 | 2006-07-17 | Method for operating a metering device of an SCR catalytic converter |
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DE102006033027.7A DE102006033027B4 (en) | 2006-07-17 | 2006-07-17 | Method for operating a metering device of an SCR catalytic converter |
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DE102006033027A1 DE102006033027A1 (en) | 2008-01-24 |
DE102006033027B4 true DE102006033027B4 (en) | 2017-12-14 |
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DE102006033027.7A Active DE102006033027B4 (en) | 2006-07-17 | 2006-07-17 | Method for operating a metering device of an SCR catalytic converter |
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Families Citing this family (2)
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CN102477892B (en) * | 2010-11-30 | 2013-09-25 | 苏州派格丽减排系统有限公司 | Automatic calibration system for urea metering jet pumps and calibration method thereof |
CN102759455A (en) * | 2011-04-29 | 2012-10-31 | 北京理工大学 | Detecting test bed of selective catalytic reduction (SCR) metering module |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19819579C1 (en) * | 1998-04-30 | 1999-09-30 | Siemens Ag | Secondary treatment of exhaust from lean burn diesel engine with SCR catalyst, minimizing pump usage and energy consumption |
DE10139142A1 (en) * | 2001-08-09 | 2003-02-20 | Bosch Gmbh Robert | Exhaust gas treatment unit and measuring device for determining a concentration of a urea-water solution |
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2006
- 2006-07-17 DE DE102006033027.7A patent/DE102006033027B4/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19819579C1 (en) * | 1998-04-30 | 1999-09-30 | Siemens Ag | Secondary treatment of exhaust from lean burn diesel engine with SCR catalyst, minimizing pump usage and energy consumption |
DE10139142A1 (en) * | 2001-08-09 | 2003-02-20 | Bosch Gmbh Robert | Exhaust gas treatment unit and measuring device for determining a concentration of a urea-water solution |
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