WO2011154222A1 - Dispositif de compensation de la pression pour systèmes hydrauliques - Google Patents

Dispositif de compensation de la pression pour systèmes hydrauliques Download PDF

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Publication number
WO2011154222A1
WO2011154222A1 PCT/EP2011/057867 EP2011057867W WO2011154222A1 WO 2011154222 A1 WO2011154222 A1 WO 2011154222A1 EP 2011057867 W EP2011057867 W EP 2011057867W WO 2011154222 A1 WO2011154222 A1 WO 2011154222A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
liquid
pressure
gas reservoir
compensation device
Prior art date
Application number
PCT/EP2011/057867
Other languages
German (de)
English (en)
Inventor
Michael Offenhuber
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP11730235.6A priority Critical patent/EP2580439A1/fr
Priority to CN2011800285759A priority patent/CN102939444A/zh
Publication of WO2011154222A1 publication Critical patent/WO2011154222A1/fr

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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
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • 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

Definitions

  • Pressure compensation device for hydraulic systems PRIOR ART
  • internal combustion engines in particular self-igniting internal combustion engines
  • the proportion of nitrogen oxides in the exhaust gas has to be reduced, among other things, due to the stricter exhaust gas legislation which will be forthcoming in the next few years.
  • An established process for nitrogen oxide reduction in exhaust aftertreatment systems is based on Selective Catalytic Reduction (SCR).
  • SCR Selective Catalytic Reduction
  • the nitrogen oxides are reduced to nitrogen and water with the aid of an operating adjuvant, in particular a pollutant-reducing medium.
  • a pollutant-reducing medium is often an aqueous urea-water solution is used, which is introduced by a metering system in the exhaust system.
  • the pollutant-reducing medium is usually conveyed from a reservoir via a supply system to a metering module with which the pollutant-reducing medium is injected into, for example, the exhaust pipe.
  • DE 10 2008 009 650 A1 describes a metering device which comprises a metering module for metering the contaminant-reducing medium and a supply system for providing the pollutant-reducing medium to the metering module.
  • the supply system includes one or more reservoirs, such as liquid tanks for receiving urea-water solution, and one or more supply lines connected to the dosing module.
  • a delivery unit is provided to ensure a flow of pollutant-reducing medium from the reservoir through the supply line to the dosing.
  • pressure fluctuations in a hydraulic system can cause faster wear and resulting damage to the components.
  • Such pressure fluctuations can be caused by pressure pulsations either in the hydraulic system internally, for example by the non-uniformity of the delivery of pumps or by the control of valves, but also externally, for example by periodic load fluctuations in hydraulic cylinders or motors.
  • freezable liquids such as, for example, aqueous urea-water solution
  • aqueous urea-water solution can freeze from about -1 ° C., depending on the antifreeze added.
  • a volume expansion of the aqueous urea-water solution of about 10% takes place. This expansion behavior causes high pressures during freezing, which can damage the fluid-loaded components of the dosing system.
  • a major challenge in known metering systems is therefore to protect the individual components, such as the dosing, from damage caused by pressure fluctuations in the hydraulic system.
  • mechanisms are used, which act in the operating state of the metering pressure-pulsating and / or in the idle state, that is switched off state, the frost resistance of the metering system.
  • An improved pressure damping is usually achieved by introducing dampers, for example a porous element (as in DE 10 2008 013 406 A1) into the supply line.
  • the frost protection meet the known solutions of the prior art, characterized in that the components to be protected of the dosing be emptied at rest.
  • DE 10 2008 009 650 A1 relates to a metering system comprising a shutdown device with energy storage, which is at least partially charged with energy during operation of the metering system.
  • the shutdown device is set up in the event of a malfunction of the dosing system and / or of a system comprising the dosing system, in particular in the event of a power supply failure of the dosing system, the dosing module and / or the supply system at least partially by means of the stored energy to defrost safely.
  • this energy storage is designed as a hydraulic accumulator.
  • a pressure compensation device for at least one liquid-acted component of a hydraulic system with a supply device - including a delivery unit and supply lines for providing a liquid - proposed, wherein the at least one liquid-loaded component of the hydraulic system is connected to at least one gas storage, which is controlled by means of a hydraulic system pressure ,
  • This device can be used in particular for a metering system for exhaust aftertreatment with, for example, a metering module as liquid-loaded component.
  • the gas storage connected to such a fluid-loaded component stores depending on the hydraulic system pressure a gas volume, wherein air is used as gas in an advantageous embodiment.
  • This hydraulic system pressure is conveyed in the operating state of the hydraulic system, that is in the on state, by means of a delivery unit liquid from, for example, a reservoir through the supply lines in the components of the system and thus pressurize the components of the hydraulic system with liquid.
  • at least one hydraulic connecting element produces a coupling between at least one gas reservoir and at least one supply line of the hydraulic system.
  • this hydraulic connecting element may comprise at least one hydraulic cylinder, which in particular has a liquid-inflatable surface, which may be configured, for example, as a piston or a membrane.
  • This at least one hydraulic cylinder is accommodated on at least one branch of the at least one supply line and connected upstream of the at least one gas storage.
  • the gas reservoir comprises a surface which can be charged with gas and which can likewise be designed as a piston or a membrane.
  • a functional link between the at least one gas reservoir and the hydraulic system pressure is preferably achieved by, for example, rigidly connecting the fluid-actuable surface of the hydraulic cylinder to the gas-impactable surface of the gas reservoir. This can be achieved by means of a device which couples the gasbeaufschlagbare surface of the gas storage and the liquid-actuated surface of the hydraulic cylinder. Such a coupling can be configured, for example, by means of a rigid piston rod between the liquid-inflatable surface of the hydraulic cylinder and the gas-impactable surface of the gas reservoir.
  • the gas storage includes a first check valve that establishes or inhibits connection to a gas source, such as outdoor fresh air. Via this first check valve, the supply of gas, such as air, takes place to the gas storage when pressurizing the hydraulic cylinder and the gas storage stored in the operating state of the hydraulic system, a gas volume.
  • a gas volume is thus introduced as a pressure damping volume in the gas storage in order to bring about a pressure equalization of pressure pulsations, for example, caused by vibrations.
  • the compression of the gas volume in the gas storage itself or a partial introduction of the gas volume into the liquid-loaded component reduces such pressure pulsations in the hydraulic system pressure and has a pressure-damping effect in the operating state.
  • the hydraulic system pressure decreases.
  • a return element in the gas storage allows the return movement of the gas-charged surface by the net mass or a foreign force, such as a spring or an elastomer, and thus allows a stripping of the stored gas volume.
  • At least one gas line and at least one second check valve are received between the gas reservoir and the at least one liquid-loaded component.
  • the second check valve separates the gas volume stored in the gas accumulator from the liquid and serves to introduce the gas volume when the hydraulic system is switched off from the gas accumulator into the liquid-loaded component connected to the gas accumulator.
  • the gas volume which can be stored in the gas reservoir is thus at least partially driven out of the gas reservoir in the idle state of the hydraulic system and absorbed in the liquid-loaded component.
  • This gas volume represents a compressible volume of compensation in the liquid-loaded component and can thus protect against ice pressure during freezing.
  • the pressure compensation device proposed according to the invention makes it possible in this way at any time, while the hydraulic system is in the operating or resting state, to compensate for pressure fluctuations in the at least one liquid-loaded component. In particular, this prevents damage and signs of wear on the fluid-loaded components of a hydraulic system, such as a dosing system.
  • An automatic compensation of pressure fluctuations in at least one liquid-loaded component by means of at least one gas accumulator makes it possible, in particular, to dampen pressure pulsations without further connections to control elements, such as valve actuation, temperature or pressure sensors, and the ice compressive strength of hydraulic systems carrying a freezable medium to ensure even when the system is switched off without external power supply.
  • control elements such as valve actuation, temperature or pressure sensors, and the ice compressive strength of hydraulic systems carrying a freezable medium to ensure even when the system is switched off without external power supply.
  • the system can be protected from freezing pressure without electrical energy.
  • no other devices in the pressure equalization pre- be provided direction to produce their Eis horrfestmaschine.
  • a gas such as air
  • a gas automatically be introduced into the hydraulic circuit without having to provide additional electrical energy to accommodate a volume expansion of a freezable medium during freezing and thus protect the component from destruction by inadmissibly high ice pressure.
  • the proposed solution according to the invention offers a simplification of the design and thus a higher robustness with lower production costs due to the omission of a number of parts.
  • the pressure compensation device proposed according to the invention can at least partially protect against wear of the components and resulting damage and thus increase their service life and reduce service costs.
  • hydraulic system 14 is a dosing system 15 known from the prior art for metering a liquid operating assistant, in particular a pollutant-reducing medium such as urea-water solution, together with a variant of the inventive pressure compensation device 10 shown schematically.
  • the metering system 15 shown in FIG. 1 comprises a supply system which provides the pollutant-reducing medium for a metering module 13, such as a metering valve or a metering pump.
  • the supply system preferably has a reservoir 40 for storing the pollutant-reducing medium and supply lines 18 in order to supply a metering module 13 with the supply pollutant-reducing medium.
  • the embodiment shown here comprises a delivery unit 16, which preferably controls pumps and pressure.
  • the metering module 13 comprises one or more metering valves which inject or spray the pollutant-reducing medium into the exhaust gas tract, the exhaust gas tract not being shown in FIG.
  • the metering system 15 comprises the pressure compensation device 10 proposed according to the invention.
  • the metering module 13 represents an example of a liquid-loaded component 12 of the metering system 15, on which the inventive pressure compensation device 10 can be used in an advantageous manner
  • the pressure compensation device 10 is connected to a liquid-loaded component 12 of the metering system 15, here the metering module 13, via a gas line 36.
  • the inventively proposed pressure compensation device 10 is coupled via a fluid-energized connecting line 42 to a branch 44 of the supply line 18.
  • the gas reservoir 20 of the pressure compensation device 10 proposed according to the invention is connected to the supply line 18 by means of a hydraulic cylinder 24 which contains a surface 26 which can be loaded with liquid.
  • This ckenkeitsbeaufschalgbare surface 26 of the hydraulic cylinder 24, which may be preferably designed as a membrane or piston, is in the operating state of the metering system 15, when the pollutant-reducing medium is transported to the metering module 13, in the pressurized state.
  • the gas reservoir 20 is accommodated between the hydraulic cylinder 24 and the gas line 36 connected to the metering module 13.
  • the gas reservoir 20 is an air reservoir, which, as an air cylinder, contains a gas-displaceable surface 28, such as a piston or a membrane.
  • the gas-impingable surface 28 is coupled via a coupling element 46, such as a piston rod, to the liquid-actuatable surface 26 of the hydraulic cylinder 24.
  • a first check valve 32 is placed in the gas reservoir 20 to establish or inhibit connection to a gas source 34, such as fresh air in the exterior of a vehicle.
  • a gas source 34 such as fresh air in the exterior of a vehicle.
  • One idea of the present invention is preferably to introduce air into the gas reservoir 20 as a pressure damping volume in the operating state of the dosing system 15 in order to temporarily reduce or compensate for pressure pulsations in the hydraulic system pressure.
  • the coupling element 46 to the gas reservoir 20 causes a pressurization of the gasbeauftschbaren surface 28, wherein preferably air from a gas source 34, such as the outdoor area by the first check valve 32 occurs.
  • a gas source 34 such as the outdoor area by the first check valve 32 occurs.
  • the gas reservoir 20 is completely or partially filled and can serve in the operating state as a compressible gas volume 29 of the pressure damping.
  • the second application of the present invention is to store a gas, such as air, and use it, for example, in the event of an emergency stop or other incident, to provide frost resistance of the components.
  • a gas such as air may be automatically introduced into the hydraulic circuit of, for example, a metering system 15 without having to provide additional electrical energy to accommodate volume expansion of, for example, aqueous solutions during freezing, thus providing a liquid-loaded component 12 To protect destruction by inadmissibly high ice pressure.
  • the delivery unit 16 When switching off the dosing 15, the delivery unit 16 is turned off and the supply system pressure decreases. This leads to a relaxation of the hydraulic cylinder 24, that is, the liquid loading of the surface 26 decreases. Due to the coupling element 46 between the hydraulic cylinder 24 and the gas reservoir 20, the pressurization of the gas-impingable surface 28 also decreases.
  • a return element 30, such as the spring shown in FIG. 1, drives the gas volume 29 stored in the gas reservoir 20 through the gas line 36 via a second check valve 38 into the liquid-loaded component 12 of the dosing system 15 to be ventilated, in this case, for example The dosing module 13.
  • ventilation slots 48 are provided in the gas storage on the side of the return element to avoid the emergence of a negative pressure on the gas-charged surface 28 on the side of the return element 30 when emptying the gas reservoir.
  • the gas volume 29 stored in the gas reservoir 20 is thus introduced into the dosing module 13 charged with liquid. This is inserted into the liquid-loaded metering module 13. brought gas volume 29 is compressible and protects in case of freezing volume expansion of the liquid from damage to the metering 13.
  • the device 10 described above thus ensures at all times, that is, both in the operating state and in the idle state that the system is protected from signs of wear by pressure pulsations and frost damage at outdoor temperatures below freezing.
  • the pressure compensation device 10 can also be applied to other fluid-loaded components 12 of the dosing system 15 than the dosing module 13 selected here.
  • Another example of a liquid-loaded components of such a dosing system 15 which are endangered by ice pressure as well as pressure pulsations can be, for example, the delivery unit 16.
  • FIG. 2 shows a further embodiment of the pressure compensation device 10 proposed according to the invention.
  • FIG. 2 shows the use of the pressure compensation device 10 on at least one liquid-loaded component 12 of a hydraulic system 14.
  • FIG. 2 shows a section of a hydraulic system 14 which includes a or may include a plurality of closed or open fluid circuits, wherein the pressure compensation device 10 proposed according to the invention can be used to protect against pressure fluctuations of one or more fluid-loaded components 12.
  • a gas volume 29 is introduced into the gas reservoir 20, which upon pressurization of the hydraulic cylinder 24 via the first check valve 32 the gas storage 20 can be supplied and serves during operation of the pressure pulsation damping.
  • the stored gas volume 29 is expelled from the gas reservoir 20 and introduced into the liquid-loaded component 12.
  • the gas volume 29 from the gas reservoir 20 via the second return stop valve 38 of the liquid-loaded component 12 are supplied. Due to the compressibility of this volume of gas introduced into the liquid-loaded component 12, it serves as an expansion compensation volume in the case of freezing and thus protects the liquid-loaded component 12 from damage due to ice pressure.
  • This method for compensating for pressure fluctuations by means of the above-described pressure compensation device 10 can preferably be used in metering systems 15 for exhaust aftertreatment in internal combustion engines.

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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)
  • Exhaust Gas After Treatment (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

L'invention concerne un dispositif (10) de compensation de la pression pour au moins un composant (12) sollicité par un liquide et associé à un système hydraulique (14), comprenant un dispositif d'alimentation contenant une unité de refoulement (16) et des conduites d'alimentation (18) pour l'alimentation en liquide. Au moins un composant (12) sollicité par un liquide est raccordé à au moins un accumulateur de gaz (20) qui est commandé au moyen d'une pression du système hydraulique. Le dispositif de compensation de la pression selon l'invention peut être utilisé notamment pour des systèmes de dosage conduisant des fluides de fonctionnement auxiliaires pour le post-traitement des gaz d'échappement dans des moteurs à combustion interne.
PCT/EP2011/057867 2010-06-09 2011-05-16 Dispositif de compensation de la pression pour systèmes hydrauliques WO2011154222A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11730235.6A EP2580439A1 (fr) 2010-06-09 2011-05-16 Dispositif de compensation de la pression pour systèmes hydrauliques
CN2011800285759A CN102939444A (zh) 2010-06-09 2011-05-16 用于液压系统的压力平衡装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010029834.4 2010-06-09
DE102010029834A DE102010029834A1 (de) 2010-06-09 2010-06-09 Druckausgleichsvorrichtung für Hydrauliksysteme

Publications (1)

Publication Number Publication Date
WO2011154222A1 true WO2011154222A1 (fr) 2011-12-15

Family

ID=44509824

Family Applications (1)

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PCT/EP2011/057867 WO2011154222A1 (fr) 2010-06-09 2011-05-16 Dispositif de compensation de la pression pour systèmes hydrauliques

Country Status (4)

Country Link
EP (1) EP2580439A1 (fr)
CN (1) CN102939444A (fr)
DE (1) DE102010029834A1 (fr)
WO (1) WO2011154222A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103953853B (zh) * 2014-04-22 2017-01-25 东莞中子科学中心 一种用于平衡液体循环回路压力波动的装置
CN104613024B (zh) * 2014-12-29 2017-05-31 广东工业大学 一种智能模糊控制精密伺服气压平衡卸荷系统
CN115182694B (zh) * 2022-07-19 2023-05-09 平顶山天安煤业股份有限公司 保真取芯气体自增益压力控制结构、取芯器与控制方法

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WO2002024312A1 (fr) * 2000-09-22 2002-03-28 Robert Bosch Gmbh Procede et dispositif de dosage d'un agent de reduction pour l'elimination d'oxydes d'azote contenus dans des gaz d'echappement
US20050252201A1 (en) * 2004-05-17 2005-11-17 Lecea Oscar A Method and apparatus for reducing NOx emissions
DE102004054238A1 (de) 2004-11-10 2006-05-11 Robert Bosch Gmbh Dosiersystem sowie Verfahren zum Betreiben eines Dosiersystems
WO2006099489A1 (fr) * 2005-03-15 2006-09-21 Miskin, Mark, R. Assistance de levage hydraulique pour appareils de terrassement remorques
DE102008009650A1 (de) 2008-02-18 2009-08-27 Robert Bosch Gmbh Störungssicheres System zur Schadstoffverminderung
DE102008013406A1 (de) 2008-03-10 2009-09-17 Robert Bosch Gmbh Abgasnachbehandlungsvorrichtung mit verbesserter Druckpulsdämpfung
US20100115932A1 (en) * 2008-01-22 2010-05-13 Armin Kassel Metering system
FR2949505A1 (fr) * 2009-09-03 2011-03-04 Peugeot Citroen Automobiles Sa Dispositif d'injection de reducteur pour une reduction catalytique selective et ensemble comportant un moteur et une ligne d'echappement muni d'un tel dispositif d'injection

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US4187682A (en) * 1979-01-02 1980-02-12 The Boeing Company Constant pressure hydraulic accumulator
US4667473A (en) * 1983-09-26 1987-05-26 Robinson Curtiss W Low compensating accumulator and bungee
DE19617950A1 (de) * 1996-05-04 1997-11-13 Hydac Technology Gmbh Kolbenspeicher mit Gasvorspannung
CA2453074A1 (fr) * 2004-01-19 2005-07-19 Carey T. Doerksen Amplificateur hydraulique assiste a gaz sous pression pour ensemble de levage hydraulique
DE102008000594A1 (de) * 2008-03-11 2009-09-17 Robert Bosch Gmbh Vorrichtung zum Entleeren einer Reduktionsmittelvorrichtung einer Brennkraftmaschine
FR2951775B1 (fr) * 2009-10-23 2012-06-22 Coutier Moulage Gen Ind Dispositif d'injection d'un produit additif dans une ligne de traitement

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Publication number Priority date Publication date Assignee Title
WO2002024312A1 (fr) * 2000-09-22 2002-03-28 Robert Bosch Gmbh Procede et dispositif de dosage d'un agent de reduction pour l'elimination d'oxydes d'azote contenus dans des gaz d'echappement
US20050252201A1 (en) * 2004-05-17 2005-11-17 Lecea Oscar A Method and apparatus for reducing NOx emissions
DE102004054238A1 (de) 2004-11-10 2006-05-11 Robert Bosch Gmbh Dosiersystem sowie Verfahren zum Betreiben eines Dosiersystems
WO2006099489A1 (fr) * 2005-03-15 2006-09-21 Miskin, Mark, R. Assistance de levage hydraulique pour appareils de terrassement remorques
US20100115932A1 (en) * 2008-01-22 2010-05-13 Armin Kassel Metering system
DE102008009650A1 (de) 2008-02-18 2009-08-27 Robert Bosch Gmbh Störungssicheres System zur Schadstoffverminderung
DE102008013406A1 (de) 2008-03-10 2009-09-17 Robert Bosch Gmbh Abgasnachbehandlungsvorrichtung mit verbesserter Druckpulsdämpfung
FR2949505A1 (fr) * 2009-09-03 2011-03-04 Peugeot Citroen Automobiles Sa Dispositif d'injection de reducteur pour une reduction catalytique selective et ensemble comportant un moteur et une ligne d'echappement muni d'un tel dispositif d'injection

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See also references of EP2580439A1 *

Also Published As

Publication number Publication date
CN102939444A (zh) 2013-02-20
DE102010029834A1 (de) 2011-12-15
EP2580439A1 (fr) 2013-04-17

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