US20150034189A1 - Dosing device - Google Patents

Dosing device Download PDF

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Publication number
US20150034189A1
US20150034189A1 US14/385,491 US201314385491A US2015034189A1 US 20150034189 A1 US20150034189 A1 US 20150034189A1 US 201314385491 A US201314385491 A US 201314385491A US 2015034189 A1 US2015034189 A1 US 2015034189A1
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United States
Prior art keywords
pressure chamber
dosing device
dosing
pressure
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.)
Abandoned
Application number
US14/385,491
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English (en)
Inventor
Matthias Burger
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of US20150034189A1 publication Critical patent/US20150034189A1/en
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BURGER, MATTHIAS
Abandoned legal-status Critical Current

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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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in 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
    • 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
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump

Definitions

  • the present invention relates to a dosing device for introducing a liquid medium into an exhaust-gas stream of an internal combustion engine of a motor vehicle.
  • nitrogen oxide reduction is imperatively necessary.
  • One possibility for nitrogen oxide reduction is, for example, the known method of selective catalytic reduction (SCR).
  • SCR selective catalytic reduction
  • a liquid reducing agent for example a urea-water solution
  • ammonia gas is generated from the urea-water solution, by means of which ammonia gas the nitrogen oxide, which is harmful to health, is reduced to form non-hazardous water and nitrogen.
  • DE 10 2010 28 866 A1 has disclosed a device for introducing the urea-water solution into the exhaust-gas stream.
  • the urea-water solution is pressurized by means of an electrically driven pump.
  • the injection itself is controlled by way of the electric actuation of a dosing valve. Owing to the electric actuator means, the dosing valve must generally be cooled.
  • a gas mixer is generally necessary in order to ensure a homogenous distribution of the urea-water solution.
  • a dosing device known from DE 10 2011 078 850 A1, which constitutes a subsequent publication, is controlled by pressure waves.
  • a valve needle of a dosing valve is held closed by means of a spring holder and automatically opens above a certain hydraulic pressure.
  • the injection is thus controlled by way of the pressure wave that is generated by means of a pump.
  • the metering accuracy of said system is not particularly high because the injection quantity is dependent on a profile of the pressure wave with respect to time, and said pressure wave form is influenced by external influences.
  • the present invention differs from the prior art in that the dosing device has a 2/2 directional valve which is arranged in a delivery line between the pump and a first low-pressure chamber of the dosing valve.
  • the dosing device according to the invention can be switched by means of the 2/2 directional valve.
  • the 2/2 directional valve exhibits only two states: either it is open or it is closed.
  • the required pressure for the liquid medium is generated by the pump, preferably by a predelivery pump, wherein no particularly great requirements have to be imposed on the pump, in particular with regard to a build-up of pressure.
  • the pump should be capable of building up a delivery pressure of approximately 9 bar. Since the 2/2 directional valve and the pump are components of simple construction, the dosing device can be produced at low cost.
  • the 2/2 directional valve may be an integral constituent part of the dosing valve; it may however also be connected to the dosing valve via a line.
  • the dosing valve has at least one low-pressure chamber and at least one high-pressure chamber, and that the low-pressure chamber and the high-pressure chamber are delimited by a piston.
  • the pistons of the at least one low-pressure chamber and at least one high-pressure chamber have different piston diameters in each case.
  • That pressure chamber of the dosing valve which is the first pressure chamber downstream of the pump or downstream of the 2/2 directional valve as viewed in the flow direction is preferably the low-pressure chamber.
  • a (stepped) piston is arranged in displaceable fashion between the low-pressure chamber and the high-pressure chamber. That part of the piston which delimits the low-pressure chamber has a larger diameter than that part of the piston which delimits the high-pressure chamber.
  • the (stepped) piston is preferably of unipartite form.
  • a hydraulic pressure intensification action is realized which can advantageously generate very high injection pressures with simultaneously high delivery quantities.
  • the high pressure that can thus be generated serves for the injection of the liquid medium into the exhaust pipe.
  • the liquid medium can be atomized to form very small droplets, and rapid mixture formation with high quality can be achieved even over extremely short mixing paths.
  • a check valve is arranged between the low-pressure chamber and the high-pressure chamber.
  • the dosing device according to the invention in particular the dosing valve, is of relatively simple construction, which imposes no special requirements on the manufacturing technology used. Accordingly, it is for example possible for all of the guides to be ground in one working step without rechucking The dosing device according to the invention is thus inexpensive to produce and operates reliably.
  • a delivery volume of the dosing device according to the invention is also advantageous for a delivery volume of the dosing device according to the invention to be constant. This is realized primarily by means of defined upper and lower stops for the (stepped) piston in the low-pressure chamber and/or in the high-pressure chamber. The end stops structurally define the delivery volume. Adherence to predefined exhaust-gas limit values in the exhaust pipe is thus ensured. Furthermore, the system is OBD-2 compliant. This is to be understood to mean the capability for the SCR system to be monitored during the operation of the internal combustion engine, and thus for functionality to be ensured over the entire service life of the internal combustion engine.
  • the dosing device prefferably has at least one exchangeable spacer device for defining a piston stroke in at least one pressure chamber.
  • at least one stop of the piston it is for example possible for at least one stop of the piston to be altered by the exchangeable spacer device, in order that the piston stroke and thus the delivery quantity of liquid medium can be adapted to different internal combustion engines or exhaust-gas devices, and accurately defined.
  • the spacer device may in this case be designed, for example, as an annular disk (for example a so-called residual air gap disk) which is positioned relative to a fixedly arranged stop in the interior of the dosing valve.
  • the disk may also bear against the housing of the dosing valve such that the stroke movement of the piston is limited by the disk.
  • the piston stroke can be correspondingly defined, wherein an assortment of disks of different thickness offers a selection with which the delivery volume of dosing valves of the same type of construction can be easily modified and adapted to different internal combustion engines or exhaust-gas devices. In this way, the construction of the dosing device can be standardized and used in substantially all exhaust-gas devices.
  • the dosing device according to the invention injects a liquid reducing agent, for example urea-water solution, for nitrogen oxide reduction into the exhaust-gas stream.
  • a liquid reducing agent for example urea-water solution
  • the dosing device according to the invention is part of a known method for selective catalytic reduction (SCR).
  • the dosing valve is arranged upstream of an SCR catalytic converter as viewed in the exhaust-gas flow direction.
  • the dosing device according to the invention injects diesel fuel for particle filter regeneration into the exhaust-gas stream.
  • the dosing device according to the invention is part of a known method for the removal of soot particles at the particle filter of a diesel engine.
  • the dosing valve is arranged in the exhaust pipe upstream of an oxidation catalytic converter.
  • a housing of the dosing valve prefferably has cooling ducts.
  • the cooling ducts are preferably connected to the tank return line for the liquid medium. In this way, the quantity flowing back into a storage tank can be used for cooling purposes.
  • FIG. 1 shows the context of the invention
  • FIG. 2 shows a dosing device according to the invention in detail.
  • FIG. 1 illustrates an internal combustion engine 1 with an exhaust-gas aftertreatment device 3 in highly simplified and schematic form, and shows the context of the invention.
  • the exhaust-gas aftertreatment device 3 comprises an exhaust pipe 5 , an oxidation catalytic converter 7 and an SCR catalytic converter 11 for the selective catalytic reduction of nitrogen oxide, which is harmful to health.
  • the illustration does not show a particle filter, which is normally arranged downstream of the oxidation catalytic converter 7 .
  • the flow direction of the exhaust gas through the exhaust pipe 5 is indicated by arrows (without reference sign).
  • a dosing valve 13 for the urea-water solution is arranged on the exhaust pipe 5 upstream of the SCR catalytic converter 11 .
  • the dosing valve 13 injects the urea-water solution into the exhaust pipe 5 upstream of the SCR catalytic converter 11 when required, for example when a high concentration of nitrogen oxides in the exhaust gas is detected.
  • ammonia gas is generated from the urea-water solution, by means of which ammonia gas the nitrogen oxide, which is harmful to health, is reduced in the SCR catalytic converter 11 to form non-hazardous water and nitrogen.
  • the dosing valve 13 is part of a dosing device 15 .
  • the dosing device 15 furthermore comprises a 2/2 directional valve 17 which is arranged in a delivery line 19 between a pump 23 and the dosing valve 13 .
  • the delivery line 19 supplies urea-water solution to the dosing valve 13 from a storage tank 21 .
  • the delivery line 19 has a pump 23 , preferably a predelivery pump, between the 2/2 directional valve 17 and the storage tank 21 .
  • the predelivery pump 23 should preferably be capable of generating a delivery pressure of approximately 9 bar.
  • a return line 24 into the storage tank 21 for excess urea-water solution is connected to the dosing valve 13 .
  • the 2/2 directional valve 17 may—as illustrated in FIG. 1 —be arranged in the delivery line 19 , though may also be integrated in the dosing valve 13 (integrated dosing module IDM).
  • sensors arranged in the exhaust-gas aftertreatment device 3 specifically a nitrogen oxide sensor 25 and temperature sensors 27 and 29 .
  • the sensors shown here constitute merely a certain exemplary selection, wherein yet further sensors may be arranged in the region of the exhaust pipe 5 in the real operating situation.
  • the sensors 25 , 27 and 29 and the predelivery pump 23 and the 2/2 directional valve 17 are connected by way of signal lines (without reference sign) to a control unit 31 .
  • the control unit 31 may also comprise multiple control units in a distributed arrangement.
  • FIG. 2 shows the dosing device 15 according to the invention, in particular the dosing valve 13 , in detail.
  • the dosing device 13 is enclosed by a housing 33 , out of which a nozzle body 35 projects.
  • An outwardly opening nozzle needle 37 is guided in the nozzle body 35 .
  • the nozzle needle 37 closes the nozzle body 35 under the action of the spring force of a nozzle closing spring 39 .
  • the nozzle needle 37 opens when the pressure in a high-pressure chamber 41 of the dosing valve 13 is of such a magnitude that the hydraulic forces acting on the nozzle needle 37 are greater than the forces of the nozzle closing spring 39 that act on the nozzle needle 37 in the closing direction.
  • the housing 33 encloses a cylinder 45 .
  • the delivery line 19 issues, directly downstream of the port 43 in the cylinder 45 , into a low-pressure chamber 47 , which in turn is delimited by a hollow-bored piston 49 .
  • the hollow chamber of the piston 49 is part of the low-pressure chamber 47 .
  • the piston 49 can be moved counter to the spring force of a restoring spring 51 under the action of the delivery pressure in the delivery line 19 .
  • the restoring spring 51 is arranged coaxially with respect to a reduced-diameter section 49 . 2 of the piston 49 .
  • a step in the cylinder 45 serves as a stroke stop 52 for the piston 49 .
  • a residual air gap disk 53 is arranged as a spacer between the port 43 and the piston 49 , said residual air gap disk being arranged fixedly in the interior of the housing 33 .
  • the residual air gap disk 53 limits the stroke movement of the piston 49 .
  • a volume of the low-pressure chamber 47 , and a possible stroke of the piston 49 can be set at the assembly stage.
  • the low-pressure chamber 47 is closed with respect to the high-pressure chamber 41 by a ball 55 of a check valve.
  • the ball 55 is pressed against an opening of the low-pressure chamber 47 by a compression spring 57 , counter to the action of the pressure in the low-pressure chamber 47 .
  • the ball 55 is thus the valve element of a check valve between low-pressure chamber 47 and high-pressure chamber 41 .
  • a diameter D of the piston 49 in the low-pressure chamber 47 in the region of the port 43 of the delivery line 19 is greater than the diameter d of the piston 49 that is subjected to pressure by the high-pressure chamber 41 .
  • the urea-water solution can be returned into the storage tank 21 via a return chamber 61 .
  • the dosing valve 13 functions as follows:
  • the dosing valve 13 is supplied with urea-water solution from the storage tank 21 via the delivery line 19 .
  • the 2/2 directional valve 17 arranged in the delivery line 19 is, during operation, either open or closed. The corresponding position is specified by the control unit 31 .
  • the pressure in the low-pressure chamber 47 is raised to the predelivery pressure (approximately 9 bar) generated by the pump 23 .
  • the return chamber 61 is permanently connected to the return line into the storage tank 21 and is at ambient pressure, a resultant force acts on the piston 49 in the low-pressure chamber 47 . Said resultant force pushes the piston 49 downward, which ultimately results in an increase of pressure of the urea-water solution in the high-pressure chamber 41 .
  • the nozzle needle 37 opens counter to the force of the nozzle closing spring 39 , and the urea-water solution is injected until the piston 49 has reached its lower stroke stop 52 on the housing 33 .
  • the delivery into the high-pressure chamber 41 is ended.
  • the 2/2 directional valve 17 is subsequently closed. As a result, the pressure in the low-pressure chamber 47 and in the high-pressure chamber 41 falls, and the nozzle needle 37 closes.
  • the force of the restoring spring 51 pushes the piston 49 upward until the latter has reached its end position. Owing to the upward movement of the piston 49 , the pressure in the high-pressure chamber 41 falls to a value below the pressure level in the low-pressure chamber 47 , and the ball 55 of the check valve opens. In this phase, the high-pressure chamber 41 is refilled with the displaced volume from the low-pressure chamber 47 . Owing to the pressure intensification, a greater volume is displaced in the low-pressure chamber 47 than can be received in the high-pressure chamber 41 . The excess urea-water solution is discharged via the throttle 59 into the return line 24 .
  • the dosing valve 13 With every stroke of the piston 49 , the dosing valve 13 according to the invention always delivers an exactly defined volume. This is ensured by virtue of the fact that the 2/2 directional valve 17 is open for longer than the piston 49 requires to perform its maximum stroke. In this way, the dosing valve 13 can be operated volumetrically. In this way, for example in the context of on-board diagnosis, a time for the injection of the known delivery quantity can be determined in the control unit 31 , and it can thus be ensured that predefined exhaust-gas limit values are adhered to in the exhaust pipe 5 .
  • the stroke of the pressure intensifier can be set exactly by way of the thickness of the residual air gap disk 53 , wherein the residual air gap disk 53 simultaneously defines the upper end position of the piston stroke.
  • the housing 33 may comprise cooling ducts which are connected to the return line 24 . In this way, the quantity of urea-water solution flowing back into the storage tank 21 can be used for cooling purposes.
  • the storage tank 21 may be filled with diesel fuel.
  • the dosing device 15 can be used for the regeneration of the particle filter in the exhaust pipe 5 .
  • a burner is provided upstream of the particle filter and of the oxidation catalytic converter 7 , which burner, when required, generates a flame which serves to evaporate the fuel additionally injected into the exhaust gas.
  • This exhaust-gas/fuel mixture reacts in intensely exothermic fashion in the oxidation catalytic converter 7 .
  • the exhaust gas reaches the high temperature required for the regeneration of the particle filter.
  • the dosing valve 13 is arranged in the exhaust pipe 5 upstream of the oxidation catalytic converter 7 .
  • This embodiment may be implemented in addition to or alternatively to the injection of urea-water solution upstream of the SCR catalytic converter 11 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
US14/385,491 2012-03-15 2013-01-28 Dosing device Abandoned US20150034189A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012204107.9 2012-03-15
DE201210204107 DE102012204107A1 (de) 2012-03-15 2012-03-15 Dosiervorrichtung
PCT/EP2013/051537 WO2013135413A1 (de) 2012-03-15 2013-01-28 Dosiervorrichtung

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/051537 A-371-Of-International WO2013135413A1 (de) 2012-03-15 2013-01-28 Dosiervorrichtung

Related Child Applications (1)

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US15/075,739 Continuation US9752483B2 (en) 2012-03-15 2016-03-21 Method of operating a dosing device

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US20150034189A1 true US20150034189A1 (en) 2015-02-05

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US14/385,491 Abandoned US20150034189A1 (en) 2012-03-15 2013-01-28 Dosing device
US15/075,739 Expired - Fee Related US9752483B2 (en) 2012-03-15 2016-03-21 Method of operating a dosing device

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US15/075,739 Expired - Fee Related US9752483B2 (en) 2012-03-15 2016-03-21 Method of operating a dosing device

Country Status (4)

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US (2) US20150034189A1 (de)
EP (1) EP2825740B1 (de)
DE (1) DE102012204107A1 (de)
WO (1) WO2013135413A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170284259A1 (en) * 2016-04-04 2017-10-05 Röchling Automotive SE & Co. KG Scr device with valve arrangement
US20170356318A1 (en) * 2016-06-10 2017-12-14 Robert Bosch Gmbh Dnox dosing tester and method

Citations (4)

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US9752483B2 (en) 2017-09-05
US20160201536A1 (en) 2016-07-14
WO2013135413A1 (de) 2013-09-19
EP2825740A1 (de) 2015-01-21
EP2825740B1 (de) 2017-10-04
DE102012204107A1 (de) 2013-09-19

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