EP2524120A1 - Dispositif pourvu d'un injecteur pour un agent de reduction liquide - Google Patents

Dispositif pourvu d'un injecteur pour un agent de reduction liquide

Info

Publication number
EP2524120A1
EP2524120A1 EP11700626A EP11700626A EP2524120A1 EP 2524120 A1 EP2524120 A1 EP 2524120A1 EP 11700626 A EP11700626 A EP 11700626A EP 11700626 A EP11700626 A EP 11700626A EP 2524120 A1 EP2524120 A1 EP 2524120A1
Authority
EP
European Patent Office
Prior art keywords
liquid
injector
tank
reducing agent
pressure sensor
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.)
Ceased
Application number
EP11700626A
Other languages
German (de)
English (en)
Inventor
Wolfgang Maus
Ludwig Wieres
Jan Hodgson
Rolf BRÜCK
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.)
Continental Automotive GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
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 Emitec Gesellschaft fuer Emissionstechnologie mbH filed Critical Emitec Gesellschaft fuer Emissionstechnologie mbH
Publication of EP2524120A1 publication Critical patent/EP2524120A1/fr
Ceased legal-status Critical Current

Links

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]
    • 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
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors
    • 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

Definitions

  • the present invention relates to an injector for a liquid, in particular for adding liquid reducing agent to a mobile exhaust system of a motor vehicle.
  • the present invention further relates to an arrangement which has a tank with a tank bottom and a conveying unit for a liquid, wherein the liquid is in particular a liquid reducing agent for exhaust aftertreatment.
  • a liquid reducing agent is preferably injected into the exhaust gas stream to convert the nitrogen oxides contained in the exhaust gas stream into elemental nitrogen (N 2 ) and water (H 2 O) by means of a catalyst.
  • an active substance for example, ammonia (NH 3 ) and / or urea (CH 4 N 2 O) is preferably dissolved in water and added thereto.
  • a tank is provided which cooperates with a delivery unit, so that a delivery of the reducing agent from the tank to the exhaust gas flow is made possible.
  • a further object is to state that measures are to be specified which enable the flawless removal of liquid reducing agent in the thawing process or shortly after the thawing process, so that, in particular, a substantially bubble-free delivery is made possible.
  • a further object of the invention is to propose measures with which more precise information about the thawing degree or the level of liquid reducing agent during the thawing process or shortly after the thawing process is available.
  • a goal is seen to specify measures with which a monitoring and / or control of the delivery unit and / or the injector is possible.
  • the technical effort should be low, whereby, if necessary, an improved data acquisition on state variables, in particular with regard to the pressure to be achieved in the conveyor system.
  • a device according to the features of claim 1 is proposed.
  • Advantageous developments, which optionally relate to further objects of the invention are given in the dependent formulated claims. It should be noted that the features listed individually in the claims in any technologically meaningful way, can be combined with each other and show other embodiments of the invention. The description, in particular in conjunction with the figures, explains the invention and provides additional embodiments. Accordingly, a device comprising an injector for a liquid is proposed here, which is designed with at least one pressure sensor, preferably an integrated pressure sensor.
  • injector is understood to mean, in particular, an adding agent which releases or closes / closes off a line section for the liquid at predetermined times, although in principle it is possible for such injectors to be designed to be self-opening, ie if a predetermined pressure of the liquid prevails in front of the injector
  • injectors are used in many cases in the manner of an injection nozzle
  • Such an injection nozzle optionally comprises a needle valve, the needle of which is pressed onto a valve seat by pretensioned springs in nozzle holders.
  • a fluid pressure is distributed in the pressure chamber, which is above the nozzle Opening is located and opens the nozzle by pressure against lying in the pressure chamber conical pressure shoulder of the nozzle needle.
  • the lifting of the needle can also be effected by a drive, in particular by means of an electrically operated magnetic drive.
  • a drive in particular by means of an electrically operated magnetic drive.
  • an injector can have a nozzle at the outlet, for example a pin nozzle and / or a hole nozzle.
  • the pressure sensor is integrated in the injector or detachably connected to the pressure sensor is.
  • this also means that the pressure sensor is in communication with fluid which is already located in the injector and / or with components which interact pressure-sensitively with the fluid and are arranged in or on the injector.
  • the pressure sensor is connected to a port of the injector to an injection line for supplying the liquid to the injector. This can in particular be done so that the pressure sensor is screwed to the port or is integrated with this or in this.
  • the injector comprises a needle valve with a pressure chamber and the pressure sensor is formed in fluid communication with the pressure chamber.
  • a pressure sensor can be very space-saving.
  • the electrical conductors or signal conductors which are partly available for the operation of the injector can also be used to evaluate the pressure in the injector. Consequently, a technically simple solution is given.
  • the monitoring of the entire unit is a measurement of a state variable, such as the pressure near the outlet opening to the exhaust system is advantageous, so that particularly accurate measurements can be achieved.
  • a "liquid” is to be understood as meaning, in particular, a substance which has a liquid state of aggregation at least at room temperature.
  • the liquid is very particularly preferably a reducing agent for the treatment of nitrogen oxides, as occur in the exhaust gas of internal combustion engines
  • the liquid reducing agent may additionally comprise at least one freezing-point-lowering substance, as well as small particles which do not hinder the conveying.Thus, by "liquid” a generic term is given, in particular for exactly these reducing agent types.
  • the at least one integrated pressure sensor is arranged in a housing of the injector. Accordingly, it is very particularly preferred for the pressure sensor to be enclosed or protected by the housing of the injector. In this way it is also possible to protect the pressure sensor against the ambient conditions near the exhaust system, for example by appropriate seals, insulation, etc.
  • an arrangement which comprises at least one tank with a tank bottom and a liquid feed unit, wherein the conveyor unit is arranged in a chamber on the tank bottom and connected to an injector for a liquid which can be positioned on an exhaust pipe is, wherein at least one device according to the invention is formed.
  • the tank can basically be made of metal and / or plastic. Regularly, the tank has a complex geometry because he adapts to the conditions or the spatial conditions in the motor vehicle.
  • the tank can be made in one piece, but this is not mandatory.
  • a tank bottom, one or more tank sides and a tank cover can be assigned to the tank, which together define the tank interior or the tank volume.
  • the tank is subdivided into several sub-volumes, so that (different) amounts of liquid are stored in the different sub-volumes.
  • the arrangement also has at least one conveyor unit, wherein regularly exactly one (individual) conveyor unit will be provided.
  • the delivery unit comprises components with which the liquid can be conveyed out of the tank (passive components such as liquid-carrying lines and active components such as apparatuses for treatment, conversion, heating, etc. of the liquid).
  • the delivery unit preferably comprises at least one pump and corresponding delivery lines for the liquid.
  • the delivery unit it is possible for the delivery unit to have further components, such as at least one filter, at least one sensor and / or at least one valve.
  • electronic or electrical components may be integrated, such as circuits, memory, computer or the like.
  • the delivery unit of the arrangement according to the invention is arranged in a chamber on the tank bottom.
  • the chamber represents in particular an inward curvature, indentation, recess or the like from the adjacent tank bottom.
  • the chamber starts from the tank bottom, forms a chamber height.
  • the chamber is free of the liquid stored in the tank and at least partially receives the delivery unit.
  • the chamber may be an integral or separate connection part of the tank bottom. It is further preferred that the chamber, preferably at the level of the adjacent tank bottom, is closed. Furthermore, it is preferred that the chamber is arranged eccentrically relative to the tank, ie near a tank side. It is further preferred here that the chamber has at least one heater. It is particularly preferred that the heater is operated with electrical energy.
  • the heater can basically be designed separately, be part of the conveyor unit and / or be arranged in or on a chamber wall.
  • the arrangement proposed here has a number of advantages.
  • the protruding into the tank chamber allows a space-saving arrangement of the conveyor unit.
  • the bottom of the conveyor unit also allows a complete emptying of the tank with respect to the liquid regardless of the design of the tank, for example, compared to tanks, in which the liquid is removed via a arranged on the tank ceiling conveyor unit.
  • the chamber protruding into the tank with its heating allows the heat during thawing deeper or further into the interior into the ice brought. Also, the heated surface is increased locally.
  • the preferred contour of the chamber with relatively steep (practically almost perpendicular to the tank bottom) chamber side walls also leads to a directed flow of thawed reducing agent to a predetermined area of the tank bottom is done, so that quickly thawed a large amount of the liquid and to a Removal point can be transported.
  • the integrated sensor injector according to the invention can also interact with other arrangements. If necessary, other or several state variables (pressure, temperature, conductivity, etc.) can be integrated at the same time determining sensors.
  • the arrangement is designed in the manner of a reducing agent supply device for motor vehicles with an internal combustion engine, wherein the exhaust gases are guided in an exhaust system and will deliver reducing agent into the exhaust system (regulated).
  • the reducing agent supply device is in the Integrated motor vehicle by the tank is attached to the motor vehicle.
  • the reducing agent supply device is configured, in particular with the use of a corresponding control, to add reducing agent to the exhaust gas system as needed.
  • the injection line can be relatively long, for example longer than 3 m or even longer than 4 m.
  • an embodiment of the injector according to the invention is considered to be particularly advantageous here.
  • the tank 1 shows schematically a motor vehicle 22 for storing a liquid 2, in particular for storing liquid reducing agent, such as an aqueous urea solution.
  • the tank 1 forms an interior through its boundary walls, which are here formed with an upper tank cover 7, a bottom tank bottom 5 and intermediate tank sides 6.
  • the tank 1 shown here also has in the tank ceiling 7 a filling opening 3, via which the tank 1 can be filled as needed with liquid 2.
  • a sol- rather tank 1 has one or more level gauge 4, with the current level of the liquid 2 in the tank 1 can be determined.
  • a chamber 9 is formed, in which a conveyor unit 8 is arranged.
  • the delivery unit 8 removes liquid 2 via a drain 10, which is likewise arranged in the vicinity of the tank bottom 5, from the interior of the tank 1.
  • the delivery unit 8 comprises (in the sequence of flow indicated here, starting from the outlet 10) first a filter 13, then a pump 14 and a valve 16, with which the liquid is directed to the injector 17.
  • a temperature sensor 25 (or possibly another sensor) may be provided.
  • the injector 17 also has a housing 26 in which a pressure sensor 15 is integrated.
  • the valve 16 allows alternatively for forwarding the liquid 2 to an injector 17 and the promotion to a return 11, through which the liquid 2 is again supplied to the tank 1 and consequently exits from the chamber 9 into the tank again.
  • a controller 18 may be provided, which is connected to signal conductors 23 with the components.
  • the controller 18 may be connected to various sensors (eg, also the integrated pressure sensor 15) and / or superordinate controls (such as a motor control) to trigger the feed or heating as needed.
  • the controller 18 may also be integrated into the chamber 9.
  • the conveyed with the delivery unit 8 liquid 2 is supplied via the injector 17 an exhaust pipe 19, flows through the exhaust gas with a predetermined flow direction 20.
  • an evaporation eg a thermophoresis
  • conversion eg.
  • liquid 2 a hydrolysis of the liquid 2 to a reducing agent for nitrogen oxides, optionally with the aid of catalytically active substances.
  • This mixture of reducing agent and exhaust gas can then be fed to an exhaust gas treatment unit 21, in particular a catalytic converter, so that the nitrogen oxides in the exhaust gas line 19 are reduced.
  • the addition of the liquid 2 is preferably carried out taking into account the amount of liquid 2 required in the exhaust gas line 19.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un dispositif comportant un injecteur (17) pour un liquide (2) pourvu d'au moins un capteur de pression (15), de préférence d'un capteur de pression intégré (15). Ce dispositif trouve une utilisation en particulier lors de l'ajout d'un agent de réduction liquide dans un conduit de gaz d'échappement (19) d'un véhicule à moteur (22).
EP11700626A 2010-01-13 2011-01-06 Dispositif pourvu d'un injecteur pour un agent de reduction liquide Ceased EP2524120A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010004613A DE102010004613A1 (de) 2010-01-13 2010-01-13 Vorrichtung mit einem Injektor für ein flüssiges Reduktionsmittel
PCT/EP2011/050117 WO2011086023A1 (fr) 2010-01-13 2011-01-06 Dispositif pourvu d'un injecteur pour un agent de réduction liquide

Publications (1)

Publication Number Publication Date
EP2524120A1 true EP2524120A1 (fr) 2012-11-21

Family

ID=43797860

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11700626A Ceased EP2524120A1 (fr) 2010-01-13 2011-01-06 Dispositif pourvu d'un injecteur pour un agent de reduction liquide

Country Status (5)

Country Link
US (1) US8491859B2 (fr)
EP (1) EP2524120A1 (fr)
JP (1) JP2013517409A (fr)
DE (1) DE102010004613A1 (fr)
WO (1) WO2011086023A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010047277A1 (de) * 2010-10-01 2012-04-05 Emitec Gesellschaft Für Emissionstechnologie Mbh Reduktionsmitteltank mit Temperatursensor
KR101490931B1 (ko) * 2013-08-13 2015-02-06 현대자동차 주식회사 요소수 펌핑모듈
DE102016102169A1 (de) 2016-02-08 2017-08-10 Denso Corporation Fluidinjektor für Abgasadditive

Citations (2)

* Cited by examiner, † Cited by third party
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EP1970544A2 (fr) * 2007-03-15 2008-09-17 Deere & Company Système et procédé de moteur à combustion interne
WO2009020541A1 (fr) * 2007-08-09 2009-02-12 Caterpillar Inc. Injecteur d'agent de réduction ayant un dispositif de chauffage à purge

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JP4442997B2 (ja) * 2000-05-29 2010-03-31 株式会社ミツバ 燃料供給装置
KR20140081861A (ko) * 2006-06-08 2014-07-01 이너지 오토모티브 시스템즈 리서치 (소시에떼 아노님) 엔진 배기 가스 첨가제의 저장 시스템
DE102006050807A1 (de) * 2006-10-27 2008-04-30 Robert Bosch Gmbh Katalytische Reduktionseinrichtung
JP4165896B2 (ja) * 2007-02-19 2008-10-15 ボッシュ株式会社 還元剤経路の詰まり判定装置及び還元剤経路の詰まり判定方法
US8444060B2 (en) * 2007-07-17 2013-05-21 Mi Yan Fuel injector with deterioration detection
JP4428445B2 (ja) * 2007-09-05 2010-03-10 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP5044368B2 (ja) 2007-11-06 2012-10-10 株式会社デンソー 燃料噴射弁
JP5258319B2 (ja) * 2008-02-15 2013-08-07 ボッシュ株式会社 酸化触媒の故障診断装置及び酸化触媒の故障診断方法、並びに内燃機関の排気浄化装置
JP5223555B2 (ja) * 2008-02-19 2013-06-26 株式会社デンソー 燃料噴射装置及び蓄圧式燃料噴射装置システム
JP5383132B2 (ja) * 2008-03-28 2014-01-08 株式会社デンソー 燃圧センサ搭載構造、燃圧検出システム、燃料噴射装置、それに用いられる圧力検出装置及び蓄圧式燃料噴射装置システム
JP4894804B2 (ja) * 2008-03-28 2012-03-14 株式会社デンソー 燃料噴射弁
JP5195451B2 (ja) * 2008-04-15 2013-05-08 株式会社デンソー 燃料噴射装置、それに用いられる蓄圧式燃料噴射装置システム
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1970544A2 (fr) * 2007-03-15 2008-09-17 Deere & Company Système et procédé de moteur à combustion interne
WO2009020541A1 (fr) * 2007-08-09 2009-02-12 Caterpillar Inc. Injecteur d'agent de réduction ayant un dispositif de chauffage à purge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011086023A1 *

Also Published As

Publication number Publication date
JP2013517409A (ja) 2013-05-16
DE102010004613A1 (de) 2011-07-14
US20120308455A1 (en) 2012-12-06
US8491859B2 (en) 2013-07-23
WO2011086023A1 (fr) 2011-07-21

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