DE102012204100A1 - Fluid delivery system and method for delivering a fluid - Google Patents
Fluid delivery system and method for delivering a fluid Download PDFInfo
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- DE102012204100A1 DE102012204100A1 DE102012204100A DE102012204100A DE102012204100A1 DE 102012204100 A1 DE102012204100 A1 DE 102012204100A1 DE 102012204100 A DE102012204100 A DE 102012204100A DE 102012204100 A DE102012204100 A DE 102012204100A DE 102012204100 A1 DE102012204100 A1 DE 102012204100A1
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- fluid
- pressure line
- pressure
- fluid delivery
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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]
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
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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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
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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
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- 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)
- Pipeline Systems (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
Ein Fluidfördersystem (1), insbesondere für ein Einspritzsystem hat einen Fluidreservoir (2) zur Speicherung des fördernden Fluids (3); eine Fluidförderpumpe (8) und einer Druckleitung (12). Die Fluidförderpumpe (8) ist ausgebildet, um im Betrieb Fluid (3) aus dem Fluidreservoir (2) zu entnehmen und unter erhöhtem Druck in die Druckleitung (12) auszugeben. Zwischen der Druckleitung (12) und dem Fluidreservoir (2) ist eine Rückflussleitung (20) mit einem regelbaren Rücklaufventil (22) angeordnet. Das Rücklaufventil (22) ermöglicht in einem geöffneten Zustand einen Rückfluss von Fluid (3) aus der Druckleitung (12) in das Fluidreservoir (2) und verhindert in einem geschlossenen Zustand den Rückfluss von Fluid (3) aus der Druckleitung (12) in das Fluidreservoir (2).A fluid delivery system (1), in particular for an injection system, has a fluid reservoir (2) for storing the delivery fluid (3); a fluid feed pump (8) and a pressure line (12). The fluid feed pump (8) is designed to remove fluid (3) from the fluid reservoir (2) during operation and to discharge it under increased pressure into the pressure line (12). Between the pressure line (12) and the fluid reservoir (2), a return line (20) with a controllable return valve (22) is arranged. The return valve (22) allows in an open state, a backflow of fluid (3) from the pressure line (12) in the fluid reservoir (2) and prevents in a closed state, the return flow of fluid (3) from the pressure line (12) in the Fluid reservoir (2).
Description
Die Erfindung betrifft ein Fluidfördersystem insbesondere für ein Einspritzsystem und Verfahren zum Fördern eines Fluids.The invention relates to a fluid delivery system, in particular for an injection system and to a method for conveying a fluid.
Stand der TechnikState of the art
Bei Kraftwagen mit einem Verbrennungsmotor, insbesondere Dieselmotor, muss insbesondere aufgrund verschärfter Abgasgesetzgebung unter anderem der Schadstoff NOx reduziert werden. Eine Methode, die dabei zur Anwendung kommt, ist das so genannte SCR-Verfahren, bei dem der Schadstoff NOx mit Hilfe eines flüssigen, harnstoffhaltigen Reduktionsmittels („AdBlue“) in einem Katalysator zu N2 und H2O reduziert wird.In motor vehicles with an internal combustion engine, in particular a diesel engine, the pollutant NO x must be reduced, inter alia, due to more stringent exhaust gas legislation. One method that is used is the so-called SCR process, in which the pollutant NO x is reduced to N 2 and H 2 O in a catalyst by means of a liquid, urea-containing reducing agent ("AdBlue").
Um einen guten Wirkungsgrad zu erreichen, sollte das flüssige Reduktionsmittel dem Abgas möglichst fein verteilt zugegeben werden. Um beim Einspritzen des Reduktionsmittels in den Abgasstrang eine möglichst feine Zerstäubung des Reduktionsmittels zu erreichen, besteht ein Bedarf nach Fluidförder- und -einspritzsystemen, die das Reduktionsmittel mit ausreichend hohem Druck zur Verfügung stellen.In order to achieve a good efficiency, the liquid reducing agent should be added to the exhaust as finely divided as possible. In order to achieve the finest possible atomization of the reducing agent when injecting the reducing agent into the exhaust gas line, there is a need for fluid delivery and injection systems which provide the reducing agent with sufficiently high pressure.
Bekannte Fluidfördersysteme weisen eine Fluidförderpumpe und eine Rücklaufdrossel auf. Der Einspritzdruck des Fluids wird dabei durch Variieren der Drehzahl der Fluidförderpumpe eingestellt. Überschüssiges, zum Einspritzen nicht benötigtes Fluid strömt durch die Rücklaufdrossel zurück in den Fluidtank.Known fluid delivery systems have a fluid delivery pump and a return throttle. The injection pressure of the fluid is adjusted by varying the speed of the fluid delivery pump. Excess fluid not needed for injection flows back into the fluid tank through the return throttle.
Offenbarung der ErfindungDisclosure of the invention
Eine Aufgabe der Erfindung ist es, ein effizienteres Fluidfördersystem und ein effizienteres Verfahren zum Fördern eines Fluids bereitzustellen.An object of the invention is to provide a more efficient fluid delivery system and a more efficient method of delivering a fluid.
Ein erfindungsgemäßes Fluidfördersystem hat ein Fluidreservoir zum Speichern des zu fördernden Fluids, eine Fluidförderpumpe und eine Druckleitung. An inventive fluid delivery system has a fluid reservoir for storing the fluid to be delivered, a fluid delivery pump and a pressure line.
Die Fluidförderpumpe ist ausgebildet, um im Betrieb Fluid aus dem Reservoir anzusaugen und unter erhöhtem Druck in die Druckleitung auszugeben. Zwischen der Druckleitung und dem Reservoir ist eine Rückflussleitung mit einem regelbaren Rücklaufventil angeordnet. Das Rücklaufventil ermöglicht in Karl-Heinzeinem geöffneten Zustand einen Rückfluss von Fluid aus der Druckleitung in das Reservoir und verhindert in einem geschlossenen Zustand den Rückfluss von Fluid aus der Druckleitung in das Fluidreservoir.The fluid delivery pump is designed to suck in fluid from the reservoir during operation and output under increased pressure in the pressure line. Between the pressure line and the reservoir, a return line with a controllable return valve is arranged. The return valve in Karl-Heinzein an open state allows a backflow of fluid from the pressure line into the reservoir and, in a closed state, prevents the backflow of fluid from the pressure line into the fluid reservoir.
Der Fluiddruck in der Druckleitung wird durch Variieren des Öffnungsquerschnitts bzw. der Öffnungsdauer („Duty-Cycle“) des Rücklaufventils eingestellt; die Menge des in der Druckleitung benötigten Fluids wird durch die Wahl der Drehzahl der Fluidförderpumpe bestimmt.The fluid pressure in the pressure line is adjusted by varying the opening cross-section or the "duty cycle" of the return valve; the amount of fluid required in the pressure line is determined by the choice of the speed of the fluid delivery pump.
In einem erfindungsgemäßen Fördersystem ist die durch die Rückflussleitung in das Reservoir zurückfließende Fluidmenge deutlich kleiner als in einem herkömmlichen Fluidfördersystem, da der Fluiddruck in der Druckleitung nicht durch eine Veränderung der Drehzahl der Fluidförderpumpe eingestellt wird. Die Drehzahl und damit die Fördermenge der Fluidförderpumpe kann vielmehr als Funktion der in der Druckleitung tatsächlich benötigten Fluidmenge eingestellt werden. Da auf diese Weise weniger Fluid, das nicht in den Abgasstrang eingespritzt wird, sondern unmittelbar in das Reservoir zurückfließt, als in einem herkömmlichen Fördersystem gefördert wird, arbeitet ein erfindungsgemäßes Fluidfördersystem mit einer höherer Effizienz als herkömmliche Fluidfördersysteme.In a conveyor system according to the invention, the amount of fluid flowing back into the reservoir through the return line is significantly smaller than in a conventional fluid delivery system, since the fluid pressure in the pressure line is not adjusted by a change in the speed of the fluid delivery pump. The speed and thus the delivery rate of the fluid delivery pump can rather be set as a function of the amount of fluid actually required in the pressure line. In this way, since less fluid that is not injected into the exhaust line but flows back directly into the reservoir than is conveyed in a conventional delivery system, a fluid delivery system of the present invention operates at a higher efficiency than conventional fluid delivery systems.
In einer Ausführungsform ist das Rücklaufventil als regelbares Druckhalteventil ausgebildet. Dies ermöglicht es, einen vorgegebenen Druck in der Druckleitung einzustellen. In einer Ausführungsform ist das Druckhalteventil stufenlos einstellbar.In one embodiment, the return valve is designed as a controllable pressure-holding valve. This makes it possible to set a predetermined pressure in the pressure line. In one embodiment, the pressure-maintaining valve is infinitely adjustable.
In einer Ausführungsform ist parallel zum Rücklaufventil eine Fixdrossel angeschlossen. Eine parallel zum Rücklaufventil angeordnete Fixdrossel ermöglicht es, Luft aus dem Fördersystem, insbesondere der Arbeitskammer der Fluidförderpumpe, abzuführen und beim Stillstand der Fluidförderpumpe durch einen Druckausgleich mit der Umgebung einen ausgeglichenen Systemdruck zu erreichen. Die Fixdrossel in einem erfindungsgemäßen Fluidfördersystem hat eine deutlich kleinere Durchflussmenge als eine Rücklaufdrossel, wie sie in einem herkömmlichen Fluidfördersystem verwendet wird.In one embodiment, a fixed throttle is connected in parallel with the return valve. A parallel to the return valve arranged fixed throttle makes it possible to remove air from the conveyor system, in particular the working chamber of the fluid supply pump and to achieve a balanced system pressure at a standstill of the fluid supply pump by pressure equalization with the environment. The fixed throttle in a fluid delivery system according to the invention has a much smaller flow rate than a return throttle, as used in a conventional fluid delivery system.
In einer Ausführungsform ist die Fluidförderpumpe mit einem umschaltbaren Rücksaugventil verbunden. Ein solches Rücksaugventil ermöglicht es, die Förderrichtung umzukehren, um bei Bedarf Fluid aus der Druckleitung zurück in den Tank zu pumpen und das System vollständig zu entleeren.In one embodiment, the fluid delivery pump is connected to a reversible suction valve. Such a suck back valve makes it possible to reverse the conveying direction in order to pump fluid from the pressure line back into the tank if necessary and to empty the system completely.
In einer Ausführungsform sind in der Druckleitung ein (beheizbares) Filter und/oder ein Drucksensor angeordnet. Ein Filter ermöglicht es, im Fluid enthaltene Partikel, die an die Druckleitung angeschlossene Einspritzdüsen verstopfen oder beschädigen können, aus dem Fluid herauszufiltern. Ein Drucksensor ermöglicht es, den Druck in der Druckleitung zu messen und zu überwachen.In one embodiment, a (heatable) filter and / or a pressure sensor are arranged in the pressure line. A filter makes it possible to filter particles contained in the fluid, which can clog or damage injectors connected to the pressure line, from the fluid. A pressure sensor makes it possible to measure and monitor the pressure in the pressure line.
In einer Ausführungsform ist die maximale Fördermenge der Fluidförderpumpe größer als die maximal aus der Druckleitung abfließende Fluidmenge. Eine Fördermenge der Fluidförderpumpe, die größer als die maximal aus der Druckleitung abfließende Fluidmenge ist, ist notwendig, um den gewünschten Druck in der Druckleitung in allen Betriebszuständen aufrecht erhalten zu können.In one embodiment, the maximum delivery rate of the fluid delivery pump is greater than the maximum outgoing from the pressure line Amount of fluid. A delivery rate of the fluid delivery pump which is greater than the maximum amount of fluid flowing out of the pressure line is necessary in order to be able to maintain the desired pressure in the pressure line in all operating states.
In einer Ausführungsform beträgt die Pumpleistung der Fluidförderpumpe wenigstens 5 kg/h. Eine Pumpleistung von 5 kg/h hat sich in vielen Fällen als ausreichend erwiesen, um den gewünschten Druck in der Druckleitung in allen Betriebszuständen aufrecht zu erhalten und die notwendige Fluidmenge bereit zu stellen.In one embodiment, the pumping capacity of the fluid delivery pump is at least 5 kg / h. A pumping rate of 5 kg / h has proved in many cases to be sufficient to maintain the desired pressure in the pressure line in all operating conditions and to provide the necessary amount of fluid.
Die Erfindung wird im Folgenden anhand der beiliegenden Figuren näher erläutert.The invention will be explained in more detail below with reference to the accompanying figures.
Dabei zeigt:Showing:
Ein herkömmliches Fluidfördersystem
Ein Ausgang der Fluidförderpumpe
Durch Umschalten des Rücksaugventils
Stromabwärts des Rücksaugventils
Das Filter
In Strömungsrichtung zwischen dem Filter
Bei einem derartigen, herkömmlichen Fördersystem
Stromabwärts des Filters
Die Bestandteile des erfindungsgemäßen Fluidfördersystems
Ein erfindungsgemäßes Fluidfördersystem
An Stelle der Drossel
In einem erfindungsgemäßen Fluidfördersystem
Die Drehzahl der Fluidförderpumpe
Parallel zum Rücklaufventil
Insbesondere beschreibt die gestrichelte Linie die Fördermenge Q der Fluidförderpumpe
Dabei ist es für die Funktion eines erfindungsgemäßen Fluidfördersystems
Ein erfindungsgemäßes Fluidfördersystem
Da in der Rückflussleitung
Claims (10)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE102012204100A DE102012204100A1 (en) | 2012-03-15 | 2012-03-15 | Fluid delivery system and method for delivering a fluid |
PCT/EP2013/050783 WO2013135401A1 (en) | 2012-03-15 | 2013-01-17 | Fluid delivery system and method for delivering a fluid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102012204100A DE102012204100A1 (en) | 2012-03-15 | 2012-03-15 | Fluid delivery system and method for delivering a fluid |
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DE102012204100A1 true DE102012204100A1 (en) | 2013-09-19 |
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DE102012204100A Pending DE102012204100A1 (en) | 2012-03-15 | 2012-03-15 | Fluid delivery system and method for delivering a fluid |
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DE (1) | DE102012204100A1 (en) |
WO (1) | WO2013135401A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016024188A1 (en) * | 2014-08-15 | 2016-02-18 | Robert Bosch Gmbh | Diesel exhaust fluid delivery system with pressure control |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012218851A1 (en) * | 2012-10-16 | 2014-04-17 | Bosch Emission Systems Gmbh & Co. Kg | reducing agent |
US9677444B2 (en) | 2015-08-19 | 2017-06-13 | Caterpillar Inc. | Reductant supply system |
CN107500241A (en) * | 2017-08-31 | 2017-12-22 | 瑞安市三阳科技有限公司 | The liquid charging device of bottle placer |
DE102017217891A1 (en) * | 2017-10-09 | 2019-04-11 | Robert Bosch Gmbh | Delivery module for conveying a fluid |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006060838A1 (en) * | 2006-12-22 | 2008-06-26 | Purem Abgassysteme Gmbh & Co. Kg | Equipment dosing reductant fluid into automobile exhaust system, is designed to vent lines, replacing liquid by ambient air to prevent frost damage |
DE102008060373B4 (en) * | 2008-12-03 | 2023-07-06 | Robert Bosch Gmbh | Exhaust gas purification device for motor vehicles |
DE102009037564B4 (en) * | 2009-08-14 | 2013-08-29 | Continental Automotive Gmbh | Apparatus and method for dosing a reducing agent in an exhaust gas tract of an internal combustion engine |
DE102009029534A1 (en) * | 2009-09-17 | 2011-03-24 | Robert Bosch Gmbh | Supply module for dosing system for proportioning supply of liquid, particularly aqueous urea solution for treatment of exhaust gases of combustion engine, has feed pump, whose promotion direction is altered by a four or two way valve |
DE102009046802A1 (en) * | 2009-11-18 | 2011-05-19 | Robert Bosch Gmbh | Device for injecting fluid into e.g. dosing device, has pressure sensor arranged at pressure line such that sensor is arranged in direct hydraulic connection with dosing module and measures pressure of fluid in module during operation |
DE102011075298A1 (en) * | 2011-05-05 | 2012-11-08 | Robert Bosch Gmbh | Pumping device for dosing system |
-
2012
- 2012-03-15 DE DE102012204100A patent/DE102012204100A1/en active Pending
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2013
- 2013-01-17 WO PCT/EP2013/050783 patent/WO2013135401A1/en active Application Filing
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016024188A1 (en) * | 2014-08-15 | 2016-02-18 | Robert Bosch Gmbh | Diesel exhaust fluid delivery system with pressure control |
US10669911B2 (en) | 2014-08-15 | 2020-06-02 | Robert Bosch Gmbh | Diesel exhaust fluid delivery system with pressure control |
DE112015003127B4 (en) | 2014-08-15 | 2024-01-25 | Robert Bosch Gmbh | Diesel exhaust fluid delivery system and method of operating a diesel exhaust fluid delivery system |
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WO2013135401A1 (en) | 2013-09-19 |
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