WO2011064266A1 - Réservoir d'agent de réduction doté d'un système de prélèvement de réservoir - Google Patents

Réservoir d'agent de réduction doté d'un système de prélèvement de réservoir Download PDF

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Publication number
WO2011064266A1
WO2011064266A1 PCT/EP2010/068148 EP2010068148W WO2011064266A1 WO 2011064266 A1 WO2011064266 A1 WO 2011064266A1 EP 2010068148 W EP2010068148 W EP 2010068148W WO 2011064266 A1 WO2011064266 A1 WO 2011064266A1
Authority
WO
WIPO (PCT)
Prior art keywords
reducing agent
tank
quality
scr
sensor
Prior art date
Application number
PCT/EP2010/068148
Other languages
German (de)
English (en)
Inventor
Philippe Grass
Original Assignee
Continental Automotive 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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2011064266A1 publication Critical patent/WO2011064266A1/fr

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]
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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
    • F01N9/00—Electrical control of exhaust gas treating 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/05—Systems for adding substances into exhaust
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/12—Other sensor principles, e.g. using electro conductivity of substrate or radio frequency
    • 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
    • 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
    • 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
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a reducing agent tank having a tank removal system for taking a reducing agent from the reducing agent tank and for conveying the reducing agent to an SCR catalyst in an exhaust line.
  • exhaust gas treatment units are known from the prior art, in which a reducing agent (urea water solution) stored in a reducing agent tank is fed to the exhaust gas line of an internal combustion engine.
  • Cars powered by diesel fuel in particular cause an increased nitrogen oxide (NOx) immission, which can be reduced by means of reducing agent injection into the exhaust gas system.
  • NOx nitrogen oxide
  • SCR selective catalytic reduction
  • Urea water solutions of a certain quality d. H. a certain mixing ratio between urea and water.
  • These urea water solutions are known under the trade names AdBlue, Urea, Denoxium and AUS 32.
  • a sufficient reduction of nitrogen oxide is therefore only possible if the reducing agent solution has a sufficiently high quality. having quality.
  • a reduction of the nitrogen oxides in the exhaust gas of the internal combustion engine is not sufficiently ensured.
  • Due to legal regulations, vehicles of modern design must have an on-board diagnostic unit that monitors all the vehicle's emission-related systems (OBD2).
  • OBD2 emission-related systems
  • the senor is designed as a sensor for measuring the conductivity of the reducing agent.
  • the conductivity of the reducing agent is relatively high and can be detected easily and inexpensively.
  • oil has a completely different conductivity that would be immediately recognized by the conductivity sensor located in the tank sampling system. This ensures that only high-quality reducing agent is injected into the SCR catalytic converter.
  • a conductivity sensor arranged in the reducing agent tank would most probably not detect contamination of the reducing agent by an oil accumulation, because the overall conductivity of the reducing agent would not be significantly affected by the oil accumulation.
  • the signals of the sensor are evaluated by a control unit, wherein the control device on detection of a lower reducing agent quality, the promotion of the reducing agent to the SCR catalyst interrupts. This ensures that only high-quality reducing agents are injected into the SCR catalyst.
  • FIG. 1 shows an internal combustion engine 6 with fuel injection nozzles 29 and with an exhaust gas system 7.
  • Internal combustion engines in particular diesel engines, generate a not inconsiderable amount of environmentally harmful nitrogen oxides NO x.
  • the discharged from the engine 6 nitrogen oxides NOx are discharged with the exhaust gas 23 via the exhaust line 7 to the environment, if not suitable measures to reduce the nitrogen oxides NOx are taken in the exhaust system.
  • the exhaust system shows a system of catalysts.
  • an oxidation catalyst 8 is provided, which is followed by a so-called SCR catalyst for reducing the nitrogen oxides NOx contained in the exhaust gas.
  • SCR stands here as abbreviation Selective Catalytic Reduction.
  • the SCR catalyst 9 the conversion of the nitrogen oxides NOx into harmless nitrogen N 2 and water H 2 0 takes place.
  • a urea-water solution which is also referred to as reducing agent 2
  • the reducing agent 2 then reacts with the nitrogen oxides NOx in the harmless components H 2 0 and N 2 .
  • a quantity of urea adapted to the NOx concentration in the exhaust gas 23 has to be injected into the SCR catalytic converter 9 via the nozzle 10.
  • any contaminants, such as oil be drawn in from the sampling tube 4 and injected into the SCR catalytic converter.
  • FIG. 1 shows a multiplicity of sensors.
  • a temperature sensor 17 and a level sensor 21 can be seen.
  • the temperature sensor 17 the temperature of the reducing agent 2 present in the reducing agent tank 1 can be continuously detected.
  • it can be determined with the temperature sensor 17 whether the reducing agent 2 is present in the reduction medium tank 1 is frozen or is in a liquid state.
  • the level sensor 21 makes it possible to measure the level of the reducing agent 2 in the reducing agent tank 1 over the entire service life of the internal combustion engine 6. All recorded data on the state of the reducing agent 2 are stored in an electrical memory 25.
  • an ultrasound transmitter / receiver can be recognized on the reducing agent tank 1 with which the speed of sound of an ultrasound wave of a specific frequency of the reducing agent 2 located in the reducing agent tank 1 can be determined.
  • the ultrasonic velocity of an ultrasonic pulse with a certain frequency in pure water differs significantly from the ultrasonic velocity of an ultrasonic wave with a certain frequency in a twenty, fifty or ninety percent reductant solution.
  • certain quality deficits of the reducing agent 2 can not or only insufficiently be detected with the sensors described so far.
  • the oil accumulation 30 shown in the reducing agent tank 1 can not be detected by the previously described sensors. If this oil 30 were to be sucked by the tank removal system without this oil suction being detected, fatal damage to the SCR catalyst 9 would be unavoidable.
  • a removal tube 4 can be seen in the reducing agent tank 1, which leads with a pipe 24 to a filter 14 and a pump 13, the reducing agent.
  • the SCR valve 11 is electrically connected to the SCR control unit 15.
  • the SCR control unit 15 thus controls the SCR valve 11.
  • the SCR control unit 15 holds a plurality of signals from the following sensors:
  • NOx sensors 18 which are arranged in the exhaust gas line 7 directly behind the internal combustion engine 6 or between the oxidation catalytic converter 8 and the SCR catalytic converter 9 and / or behind the SCR catalytic converter 9 at the outlet of the exhaust line 7;
  • Temperature sensors 17, which in turn are arranged directly behind the internal combustion engine 6 and / or behind the oxidation catalytic converter 8 and / or in the SCR catalytic converter 9 and / or behind the SCR catalytic converter 9,
  • Ultrasonic transmitter and receiver 20 arranged in or on the reducing agent tank 1,
  • All of these sensors deliver their signals to the SCR control unit 15, which in turn contains an electronic memory 25 in which all the signals supplied are recorded over the entire service life of the internal combustion engine.
  • the conductivity sensors 22, which are arranged in the extraction tube 4 and / or in the tube 24, are of particular importance. With these conductivity sensors 22, the suction of contaminants, such as the suction of oil 30, can be effectively detected. If such a soiling suction is detected, the controller 15 may protectively intervene. For this purpose, for example, the SCR valve 11 is closed and / or the return valve 12 is adjusted such that the dirt sucked in by the pump 13 through the removal tube 4 (eg oil 30) returns via the return pipe 28 back to the reducing agent tank 1 is transported.
  • control unit 16 of the internal combustion engine also receives information from the SCR control unit 15 with which the internal combustion engine can be controlled in accordance with the quality of the reducing agent and the soiling detected in the reducing agent 2. It is Z. B. conceivable that after refilling of pure water in the reducing agent tank 1, the quality of the reducing agent 2 has dropped such that an exhaust aftertreatment and the corresponding reduction of NOx can no longer be sufficiently ensured. In such a case, on the one hand, an entry is made in an error memory of the on-board diagnostic unit of the vehicle and, on the other hand, the
  • Internal combustion engine 6 are driven via the control unit 16 of the internal combustion engine in an operating state in which as little NOx is produced. This may be at the expense of the maximum performance of the internal combustion engine 6, would be a possible deliberate consequence, since the driver would be forced due to the power loss of the internal combustion engine to visit a corresponding repair workshop, which ensures that in the reducing agent tank 1, a reducing agent 2 with sufficient Qua - Quality is available. Even if a contamination of the reducing agent 2 has been detected by oil 30, the internal combustion engine can be driven by the control unit 16 in a state in which as little NOx is generated. This would ensure an environmentally sound after-treatment of the exhaust gas 23 in the exhaust line 7 at all times.

Landscapes

  • 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)

Abstract

L'invention concerne un réservoir d'agent de réduction (1) doté d'un système de prélèvement de réservoir pour le prélèvement d'un agent de réduction (2) dans le réservoir d'agent de réduction et pour transporter l'agent de réduction à un catalyseur SCR (9) dans une branche de gaz brûlés (7). Afin d'avoir de façon simple et sûre une information sur la qualité de l'agent de réduction (2) utilisé pour le nettoyage des gaz brûlés, un capteur (22), qui contrôle la qualité de l'agent de réduction (2), est disposé dans le système de prélèvement de réservoir.
PCT/EP2010/068148 2009-11-26 2010-11-24 Réservoir d'agent de réduction doté d'un système de prélèvement de réservoir WO2011064266A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009055716A DE102009055716A1 (de) 2009-11-26 2009-11-26 Reduktionsmitteltank mit einem Tankentnahmesystem
DE102009055716.4 2009-11-26

Publications (1)

Publication Number Publication Date
WO2011064266A1 true WO2011064266A1 (fr) 2011-06-03

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ID=43428531

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/068148 WO2011064266A1 (fr) 2009-11-26 2010-11-24 Réservoir d'agent de réduction doté d'un système de prélèvement de réservoir

Country Status (2)

Country Link
DE (1) DE102009055716A1 (fr)
WO (1) WO2011064266A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9512768B2 (en) 2012-04-19 2016-12-06 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Device for supplying a liquid additive and motor vehicle having the device
US9556774B2 (en) 2012-03-02 2017-01-31 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Conveying unit for a liquid additive for exhaust gas after-treatment, tank for storing liquid additive, motor vehicle having the conveying unit and method for determining a liquid additive quantity in a tank
CN110295983A (zh) * 2018-03-23 2019-10-01 罗伯特·博世有限公司 用于scr***的废气处理液存储器的清洗警报***和方法

Families Citing this family (4)

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DE102011103644A1 (de) * 2011-06-08 2012-12-13 Daimler Ag Reduktionsmitteltank und Verfahren zum Erfassen eines Vorhandenseins von flüssigem Reduktionsmittel in einem Reduktionsmitteltank
DE102013000208A1 (de) * 2013-01-08 2014-07-10 Hydac Electronic Gmbh Vorrichtung zur Ermittlung funktionsrelevanter Eigenschaften von Fluiden
EP2848931A1 (fr) * 2013-09-16 2015-03-18 Inergy Automotive Systems Research (Société Anonyme) Réservoir d'urée de véhicule associé à une chambre de détection pour le contrôle acoustique de qualité et de niveau de remplissage
DE102013112824A1 (de) 2013-11-20 2015-05-21 Elobau Gmbh & Co. Kg Entnahmeeinheit

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DE19842484A1 (de) * 1998-09-16 1999-12-02 Siemens Ag Verwendung einer Zufuhr- und/oder Entnahmeleitung und Vorratsbehälter mit einer Zufuhr- und/oder Entnahmeleitung
WO2000021881A1 (fr) * 1998-10-13 2000-04-20 Clean Diesel Technologies, Inc. REDUCTION D'EMISSIONS DE NOx D'UN MOTEUR PAR INJECTION D'UREE A TEMPERATURE CONTROLEE DANS UN PROCEDE DE REDUCTION SELECTIVE CATALYTIQUE
WO2000075643A1 (fr) * 1999-06-09 2000-12-14 Clean Diesel Technologies, Inc. Procedes et compositions assurant une reduction des emissions de nox d'un moteur par reduction catalytique selective

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DE102004051746A1 (de) * 2004-10-23 2006-04-27 Robert Bosch Gmbh Tankmodul für ein Reduktionsmittel und Dosiersystem
US7954312B2 (en) * 2007-05-09 2011-06-07 Ford Global Technologies, Llc Approach for detecting reductant availability and make-up

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DE19842484A1 (de) * 1998-09-16 1999-12-02 Siemens Ag Verwendung einer Zufuhr- und/oder Entnahmeleitung und Vorratsbehälter mit einer Zufuhr- und/oder Entnahmeleitung
WO2000021881A1 (fr) * 1998-10-13 2000-04-20 Clean Diesel Technologies, Inc. REDUCTION D'EMISSIONS DE NOx D'UN MOTEUR PAR INJECTION D'UREE A TEMPERATURE CONTROLEE DANS UN PROCEDE DE REDUCTION SELECTIVE CATALYTIQUE
WO2000075643A1 (fr) * 1999-06-09 2000-12-14 Clean Diesel Technologies, Inc. Procedes et compositions assurant une reduction des emissions de nox d'un moteur par reduction catalytique selective

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9556774B2 (en) 2012-03-02 2017-01-31 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Conveying unit for a liquid additive for exhaust gas after-treatment, tank for storing liquid additive, motor vehicle having the conveying unit and method for determining a liquid additive quantity in a tank
US9512768B2 (en) 2012-04-19 2016-12-06 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Device for supplying a liquid additive and motor vehicle having the device
CN110295983A (zh) * 2018-03-23 2019-10-01 罗伯特·博世有限公司 用于scr***的废气处理液存储器的清洗警报***和方法
CN110295983B (zh) * 2018-03-23 2022-07-08 罗伯特·博世有限公司 用于scr***的废气处理液存储器的清洗警报***和方法

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