US20110146241A1 - Method for operating a urea-water solution metering system and motor vehicle using the system - Google Patents

Method for operating a urea-water solution metering system and motor vehicle using the system Download PDF

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Publication number
US20110146241A1
US20110146241A1 US12/978,960 US97896010A US2011146241A1 US 20110146241 A1 US20110146241 A1 US 20110146241A1 US 97896010 A US97896010 A US 97896010A US 2011146241 A1 US2011146241 A1 US 2011146241A1
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United States
Prior art keywords
reactant
tank
injection nozzle
line
return line
Prior art date
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Abandoned
Application number
US12/978,960
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English (en)
Inventor
Jan Hodgson
Hermann Ketterl
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.)
Vitesco Technologies Lohmar Verwaltungs GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
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Filing date
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Publication of US20110146241A1 publication Critical patent/US20110146241A1/en
Assigned to EMITEC GESELLSCHAFT FUER EMISSIONSTECHNOLOGIE MBH reassignment EMITEC GESELLSCHAFT FUER EMISSIONSTECHNOLOGIE MBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KETTERL, HERMANN, HODGSON, JAN
Abandoned legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/18Exhaust 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
    • F01N3/20Exhaust 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
    • F01N3/2066Selective catalytic reduction [SCR]
    • F01N3/208Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/90Injecting reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9495Controlling the catalytic process
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/18Exhaust 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
    • F01N3/20Exhaust 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
    • F01N3/2066Selective catalytic reduction [SCR]
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2067Urea
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/40Nitrogen compounds
    • B01D2257/404Nitrogen oxides other than dinitrogen oxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/01Engine exhaust gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14Nitrogen oxides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/02Adding substances to exhaust gases the substance being ammonia or urea
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1473Overflow or return means for the substances, e.g. conduits or valves for the return path
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

Definitions

  • the present invention relates to a method for operating a device for providing a liquid reactant, in particular a liquid urea-water solution, to an exhaust system.
  • the device has at least one tank and an injection nozzle connected to one another through a line as well as a pump for conveying the reactant.
  • a controllable return line is connected between the pump and the injection nozzle and leads from the line to the tank.
  • the invention is used, in particular, in a dosing system provided in motor vehicles.
  • catalytic converters for selective catalytic reaction (SCR) for the purification of exhaust gases of mobile internal combustion engines such as, in particular, diesel engines, in order to reduce nitrogen oxides contained in the exhaust gas.
  • the nitrogen oxides contained in the exhaust gas react and are reduced to form elemental nitrogen at the catalytic converter, which generally includes a honeycomb catalyst carrier body with a corresponding catalytically active coating.
  • That process may be motivated, in particular, by adding a reactant or reducing agent (such as, for example, urea and/or ammonia) to the exhaust gas. If urea is introduced into the exhaust system, the urea can be directly pyrolyzed as a result of contact with the hot exhaust gas, and thereby produce the desired ammonia gas.
  • a reactant or reducing agent such as, for example, urea and/or ammonia
  • the urea is, however, also possible for the urea to be conducted across a catalytic converter for the hydrolysis of the urea, in such a way that a conversion of the urea into ammonia takes place in a catalytically motivated manner.
  • the ammonia thus provided then flows, thoroughly mixed together with the exhaust gas, into the SCR catalyst carrier body.
  • the added quantity of reducing agent or reactant must be precisely coordinated with the current situation. It is necessary to take into consideration, in particular, the pollutants currently present in the exhaust gas and also the reactivity of the SCR catalytic converter. A situation in which too little reactant is added, in such a way that the desired conversion of the exhaust-gas pollutants does not take place to the required extent, should also be avoided. The addition of too great a quantity of the reactant is also undesirable because the reactant can then likewise flow through the SCR catalytic converter without being converted, and there is accordingly the risk of the reactant being dissipated to the environment. For that reason, measures are desirable which ensure a precise dosing of a predetermined quantity of the reactant at the desired time.
  • a reactant reservoir is formed which, in particular, is at an elevated pressure, for example higher than 3 bar or even at least 7 bar or 10 bar, through the use of a pump in a (flexible) line.
  • the injection nozzle is then opened, and the injection quantity is then determined from the opening time of the injection nozzle and the pressure in the line. It is evident therefrom that such an extremely simply constructed system is likewise sensitive to inclusions, impurities and other disturbances in the conveying line.
  • This relates, in particular, to the avoidance or elimination of gas inclusions or frozen partial regions of the reactant.
  • a method for operating a device for providing a liquid reactant to an exhaust system comprises supplying the liquid reactant in the device from at least one tank through a line to an injection nozzle leading to the exhaust system, conveying the liquid reactant through the line with a pump, returning the liquid reactant from the line to the tank through a controllable return line connected between the pump and the injection nozzle, controlling operation of the injection nozzle, the pump and the return line with a controller, and only intermittently circulating the reactant through the controllable return line.
  • the return line is generally connected to the line through a valve which can be opened and/or closed at predefined times.
  • the return line is conventionally used to enable a release of pressure in the line between the injection nozzle and the pump in a situation in which the adding process is ended.
  • the reactant fed into the line at elevated pressure through the use of the pump can then flow back through the return line into the tank.
  • reactant is present in the line at a pressure substantially corresponding to ambient pressure. This also makes it possible, in the event of freezing of the device, for the reactant to expand, in particular to increase in volume by 11%, such as is to be expected with a urea-water solution.
  • the return line is used for intermittent circulation. This means, in particular, that the valve is opened and the pump conveys reactant from the tank to the return line and therefore back into the tank.
  • the return line is closed again and the pressure upstream of the injection nozzle is built up again to the desired value, in such a way that only then is a situation present again in which a controlled injection is possible. Consequently, no injection can be carried out in the circulation phase.
  • the aim of the circulation is, in particular, to remove gas inclusions which have arisen in the line during a period of standstill or due to unfavorable operating conditions, and/or to liquefy still-frozen partial regions of the reactant in the line as a result of the liquid reactant flowing past them and/or friction.
  • the desired result after the circulation is for a substantially uniform density of the reactant to be present in the line again, and accordingly for it to be possible to directly set the desired pressure conditions upstream of the injection nozzle.
  • the reactant is circulated for a conveying time period which corresponds to at least two times the time required for the device to convey reactant from the tank through the controllable return line and back into the tank. This means that the line is flushed through at least twice with reactant freshly extracted from the tank.
  • the reactant is circulated for a conveying time period which corresponds to at most five times the time required for the device to convey reactant from the tank through the controllable return line and back into the tank.
  • a conveying time period which corresponds to at most five times the time required for the device to convey reactant from the tank through the controllable return line and back into the tank.
  • the circulation of the reactant is initiated by using a device for identifying at least solid matter or gases in the reactant.
  • the device for identifying at least solid matter or gases includes a sensor, in particular a pressure sensor, which can determine the pressure in the line or in and/or directly upstream of the injection nozzle. This means, in particular, that the pressure profile during the injection phase is monitored by that device and is compared with an expected pressure change. If it is now established that the expected pressure level is not attained in the case of an acting outlet pressure and a predefined opening time of the injection nozzle, this may indicate, in particular, that gas inclusions and/or solid matter are present in the reactant. Accordingly, it would then be necessary, in the event of such solid matter and/or gases being identified in the reactant, to initiate the circulation, which may take place directly through the use of the controller.
  • the circulation of the reactant is initiated at the start of operation by using a device for identifying a tank state variable.
  • a device for identifying a tank state variable This means, in particular, sensors which can determine the filling level in the tank.
  • the device described herein is, in particular, sensitive during a tank filling process, that is to say when new reactant has been introduced into the tank. It is possible specifically during such a process for gas inclusions and the like to form. If it is thus detected by the device for identifying a tank state variable of the circulation that a tank filling process has just taken place, the circulation is initiated directly upon the start of operation of the device.
  • the reactant is circulated with an increased conveying rate as compared to when it is conveyed for an injection.
  • the pump operates with a conveying speed and conveying frequency which are respectively increased during the circulation phase as compared to during the phase in which the conveying pressure is built up in the direction of the closed injection nozzle.
  • the respective high conveying speed and conveying frequency of the pump likewise promote the breakdown of gaseous or solid inclusions in the reactant.
  • liquid urea-water solution is conveyed. That means, in particular, that liquid urea-water solution is added through the injection nozzle into the exhaust system.
  • Urea-water solution is also widely known under the product name AdBlue®.
  • a motor vehicle comprising an internal combustion engine, an exhaust system defining an exhaust gas flow direction from the internal combustion engine and including an SCR catalytic converter and an injection location for injecting a liquid reactant into the exhaust system upstream of the SCR catalytic converter in the flow direction, as well as at least one device.
  • the at least one device includes at least: a tank for the liquid reactant;
  • a controllable injection nozzle at the injection location a line interconnecting the tank and the injection nozzle; a pump for conveying the reactant from the tank to the injection nozzle; a return line connected to the line at a location between the pump and the injection nozzle, the return line leading to the tank; a valve for controlling the return line; and a controller for controlling operation of the injection nozzle, the pump and the return line by carrying out the method according to the invention.
  • the motor vehicle is, in particular, a utility vehicle, that is to say, for example, a bus, a truck, a tractor or the like.
  • the invention is used, in particular, in internal combustion engines in the form of a diesel engine.
  • the FIGURE of the drawing is a schematic and block diagram of a motor vehicle having a device for providing a liquid reactant to an exhaust system.
  • FIG. 1 a schematic and block diagram of a motor vehicle 10 having a device 1 .
  • An internal combustion engine 11 for example in the form of a diesel engine, with an adjoining exhaust system 3 , are illustrated in a left-hand part of the FIGURE.
  • Exhaust gas produced in the internal combustion engine 11 flows in a flow direction 12 , in this case, for example, initially across an oxidation catalytic converter 15 .
  • An injection nozzle 5 of the device 1 projects into a section of the exhaust system 3 which is located downstream of the oxidation catalytic converter 15 .
  • a mixer 16 In order to provide a complete conversion of the urea, it is optionally possible for a mixer 16 to be provided which further mixes the hot exhaust gas with the injected liquid, and thereby further assists the pyrolysis.
  • a hydrolysis catalytic converter 17 (which is optional, if appropriate), in which remaining urea constituents are converted into ammonia is provided downstream of the mixer 16 in the flow direction 12 . Ammonia produced in this way finally impinges together with the exhaust gas on an SCR catalytic converter 13 , in which the nitrogen oxides are selectively reduced.
  • the device 1 which is illustrated on the right-hand side of the FIGURE, has a tank 4 with a reactant 2 being shown at the top right of the tank 4 .
  • a urea-water solution is used, in particular, as the reactant 2 .
  • a line 6 leads from the tank 4 to the injection nozzle 5 .
  • the line 6 is formed with a heater 19 , for example a heatable hose, in a section between the tank 4 and a pump 7 .
  • An additional filter 20 in which any impurities from the tank 4 are retained, is provided between the pump 7 and the tank 4 .
  • a partial section of the line 6 formed between the pump 7 and the injection nozzle 5 is regularly operated with elevated pressure during operation of the device 1 .
  • a sensor 18 for determining the pressure in the line 6 is also provided between the injection nozzle 5 and the pump 7 .
  • a controllable valve 14 which is likewise provided in that region of the line 6 , is used to conduct a flow of the reactant 2 out of the line 6 from the section between the injection nozzle 5 and the pump 7 , back into the tank 4 through a return line 8 .
  • the valve 14 is conventionally used for releasing pressure from the line 6 when the device is at a standstill, or else for circulation in the method according to the invention.
  • valve 14 is opened and the reactant is conveyed from the tank 4 through the line 6 , through the filter 20 to the pump 7 , onward to the valve 14 and through the return line 8 back into the tank 4 . That circulation is preferably carried out until the line 6 has been flushed-through two to five times.
  • the valve 14 is then closed again and the desired pressure is built up upstream of the injection nozzle 5 through the use of the pump 7 .
  • Those processes are controlled through the use of the controller 9 , which consequently communicates with the injection nozzle 5 , the valve 14 , the sensor 18 and the pump 7 .
  • the position of the sensor 18 , of the valve 14 or of the return line 8 may be modified, for example by virtue of the position between the pump 7 and the injection valve 5 being varied.
  • the controller may also communicate with further sensors, for example sensors which interact with the tank and/or the internal combustion engine, and thereby generate control signals for the components mentioned herein.
  • a method is specified herein which ensures the reliable operation and precise provision or dosing of reactant into an exhaust system, and consequently low pollutant emissions to the environment during operation of the motor vehicle.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Exhaust Gas After Treatment (AREA)
US12/978,960 2008-06-27 2010-12-27 Method for operating a urea-water solution metering system and motor vehicle using the system Abandoned US20110146241A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008030756.4 2008-06-27
DE102008030756A DE102008030756A1 (de) 2008-06-27 2008-06-27 Verfahren zum Betrieb eines HWL-Dosiersystems
PCT/EP2009/057257 WO2009156281A1 (de) 2008-06-27 2009-06-12 Verfahren zum betrieb eines hwl-dosiersystems

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/057257 Continuation WO2009156281A1 (de) 2008-06-27 2009-06-12 Verfahren zum betrieb eines hwl-dosiersystems

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US (1) US20110146241A1 (ja)
EP (1) EP2310646B1 (ja)
JP (1) JP5457444B2 (ja)
DE (1) DE102008030756A1 (ja)
DK (1) DK2310646T3 (ja)
ES (1) ES2392491T3 (ja)
PL (1) PL2310646T3 (ja)
WO (1) WO2009156281A1 (ja)

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US20130111884A1 (en) * 2010-06-21 2013-05-09 Scania Cv Ab Method pertaining to air removal from a hc dosing system and a hc dosing system
US20130111882A1 (en) * 2010-06-21 2013-05-09 Lars Eriksson Method pertaining to air removal from a dosing system at an scr system and a scr system
US9140165B2 (en) 2010-04-01 2015-09-22 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Method for operating a delivery unit for a reducing agent and motor vehicle having a delivery unit
US9523299B2 (en) 2010-06-21 2016-12-20 Scania Cv Ab Method and device pertaining to cooling of dosing units of SCR systems
US9617891B2 (en) 2014-11-14 2017-04-11 Hyundai Motor Company Urea backflow prevention apparatus of SCR and control method thereof

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DE102009035940C5 (de) * 2009-08-03 2017-04-20 Cummins Ltd. SCR-Abgasnachbehandlungseinrichtung

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US9140165B2 (en) 2010-04-01 2015-09-22 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Method for operating a delivery unit for a reducing agent and motor vehicle having a delivery unit
US20130111884A1 (en) * 2010-06-21 2013-05-09 Scania Cv Ab Method pertaining to air removal from a hc dosing system and a hc dosing system
US20130111882A1 (en) * 2010-06-21 2013-05-09 Lars Eriksson Method pertaining to air removal from a dosing system at an scr system and a scr system
US20130125532A1 (en) * 2010-06-21 2013-05-23 Lars Eriksson Method pertaining to air removal from a hc dosing system and a hc dosing system
US9200557B2 (en) * 2010-06-21 2015-12-01 Scania Cv Ab Method pertaining to air removal from a dosing system at an SCR system and a SCR system
US9523299B2 (en) 2010-06-21 2016-12-20 Scania Cv Ab Method and device pertaining to cooling of dosing units of SCR systems
US9617891B2 (en) 2014-11-14 2017-04-11 Hyundai Motor Company Urea backflow prevention apparatus of SCR and control method thereof

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JP5457444B2 (ja) 2014-04-02
EP2310646A1 (de) 2011-04-20
DE102008030756A1 (de) 2010-01-07
EP2310646B1 (de) 2012-08-08
ES2392491T3 (es) 2012-12-11
DK2310646T3 (da) 2012-11-12
PL2310646T3 (pl) 2012-12-31
JP2011525588A (ja) 2011-09-22

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