US20100170226A1 - Diagnostic method for a reagent material to be introduced into an exhaust gas region of an internal combustion engine and device for performing the method - Google Patents

Diagnostic method for a reagent material to be introduced into an exhaust gas region of an internal combustion engine and device for performing the method Download PDF

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Publication number
US20100170226A1
US20100170226A1 US12/377,100 US37710008A US2010170226A1 US 20100170226 A1 US20100170226 A1 US 20100170226A1 US 37710008 A US37710008 A US 37710008A US 2010170226 A1 US2010170226 A1 US 2010170226A1
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Prior art keywords
reagent
threshold value
reagent material
material slack
catalytic converter
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US12/377,100
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English (en)
Inventor
K.G. Prakash
Thomas Lorenz
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9495—Controlling the catalytic process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • 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
    • F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1402—Exhaust gas composition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1616—NH3-slip from catalyst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1622—Catalyst reducing agent absorption capacity or consumption amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • 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 invention is based on a diagnostic method for a reagent to be introduced into an exhaust gas region of an internal combustion engine and on a device for performing the method according to the category of the independent claims.
  • Subject matter of the present invention is also a control unit program as well as a control unit program product.
  • DE 199 03 439 A1 describes a method and a device for operating a combustion engine, in whose exhaust gas region a SCR-catalyzer (selective-catalytic-reduction) is arranged, which reduces the nitrous gases that are contained in the exhaust gas of the combustion engine with a reagent to nitrogen.
  • the metering of the reagent takes place preferably depending on operating parameters of the combustion engine, as for example the engine speed and the injected fuel amount. Furthermore the metering takes preferably place depending on exhaust gas operating parameters such as the exhaust gas temperature or the operating temperature of the SCR-catalyzer.
  • the reagent ammoniac is for example used as reagent, which can be won from a urea/water solution.
  • the metering of the reagent or the reactant of the reagent has to be determined thoroughly.
  • a metering that is too low causes that nitrous gases cannot be anymore completely reduced in the SCR-catalyzer.
  • a metering that is too high causes a reagent material slack, which can result in unnecessarily high reagent consumption on the one hand and depending on the consistency of the reagent in an undesired odor nuisance.
  • ammoniac is toxic.
  • DE 10 2004 031 624 describes a method for operating a SCR-catalyzer for purifying the exhaust gas of a combustion engine, at which a control or regulation of the reagent filling level in the SCR-catalyzer with a default storage set value is provided.
  • the targeted default of the storage set value ensures on the one hand that in non-stationary statuses of the combustion engine a sufficient reagent amount is provided for the preferably complete elimination of the NOx-emissions of the combustion engine, and on the other hand that a reagent material slack is avoided.
  • the absolute reagent filling level of the SCR-catalyzer is determined by a catalytic converter model, which considers the NOx-mass flow that flows into the SCR-catalyzer, the NOx-mass flow that leaves the SCR-catalyzer, the catalyzer temperature and if necessary the reagent material slack.
  • the maximally possible reagent filling level of the SCR-catalyzer depends in particular on the operating temperature of the SCR-catalyzer.
  • the maximally possible reagent filling level is the highest at lower operating temperature and decreases with and drops to lower values operating temperature. Therefore the relative reagent filling level, which relates to the maximally possible reagent filling level under the given operating conditions, is considered instead of the absolute reagent filling level.
  • nitrous gases are only possible if the urea/water solution has a default concentration or a certain quality.
  • a reduction of the nitrous gases in the exhaust gas of the combustion unit is not ensured.
  • DE 10 2006 055 235 A1 describes a diagnostic method for a urea/water solution, at which the signal of an exhaust gas sensor that is arranged downstream after a SCR-catalyzer for determining the nitrogen oxide or ammoniac concentration is compared with a default reference value during a default length of time after filling the urea/water solution tank and if the signal deviates from the reference values by default threshold values a urea/water solution of a lower quality can be assumed.
  • the invention is based on the task to propose a diagnostic method for a reagent to be introduced into the exhaust gas region of an internal combustion engine as well as a device for performing the method, which is can be simply realized.
  • the approach of the invention enables the detection of the quality of the used reagent. By detecting a bad quality or a wrong reagent a warning notice can take place.
  • the approach according to the invention contributes therefore to guaranteeing a constantly high conversion of undesired components of the exhaust gas of a combustion engine.
  • One embodiment provides that in the presence of a first and a second release signal an average value of the occurring and not occurring exceeds of a reagent material slack threshold value is created and that the reagent is associated with a sufficient quality if an average threshold value is exceeded. The certainty of the diagnosis is thereby increased and misdiagnoses due to sporadic events or interfering signals are avoided.
  • the device according to the invention for performing the method concerns first a control unit, which has customized means for implementing the procedure.
  • the control unit preferably contains at least one electrical storage, in which the steps of the procedure are saved as control unit program.
  • the control unit contains a reagent filling level detection for detecting the relative reagent filling level, load change detection for detecting a change of the load of the combustion engine in relation to the time as well as a reagent material slack comparator for comparing the reagent material slack with a reagent material slack threshold value.
  • One embodiment of the device according to the invention provides a NOx-sensor as the exhaust gas sensor, which has a cross sensitivity towards the reagent.
  • a sensor can be provided as the exhaust gas sensor, whose sensitivity towards the reagent is specially arranged.
  • a urea/water solution is provided as the reagent, from which the reagent ammoniac is won, a NH3-sensor can be provided as exhaust gas sensor.
  • control unit program product with a program code that is saved on a machine readable device performs the procedure, if the program runs in the control unit.
  • FIG. 1 shows a technical environment, in which the procedure according to the invention is carried out
  • FIGS. 2 a - 2 g each show a signal course depending on the time.
  • FIG. 1 shows a combustion engine 10 , in whose exhaust gas region 11 a reagent introducing device 12 , a catalyzer 13 as well as an exhaust gas sensor are arranged.
  • a NOx-concentration % NOx_vK occurs upstream in front of the catalyzer 13 and a reagent material slack % NH3_nK downstream after the catalyzer 13 .
  • the reagent introducing device 12 is assigned to a metering valve DV, which is impinged by a control unit 20 with a metering signal s_D.
  • the exhaust gas sensor 14 provides a reagent material slack measuring signal NH3_Mes to the control unit 20 .
  • the exhaust gas of the combustion engine 10 contains at least one undesired exhaust gas component, which the catalyzer has to reduce.
  • Such an undesired exhaust gas component is for example the NOx-concentration % NOx_vK, which has to be converted in the catalyzer 13 into less harmful connections.
  • the catalyzer 13 requires a reagent for the conversion, which is introduced into the exhaust gas upstream before the catalyzer 13 .
  • the reagent can be introduced for example inside the motor itself.
  • the reagent is dosed into the exhaust gas over the reagent introducing device 12 .
  • the reagent amount is determined by the metering valve DV, which is impinged with the metering signal s_D.
  • the metering signal s_D is determined by the control unit 20 preferably with the aid of familiar operating parameters of the combustion engine 10 such as the engine speed or the load La.
  • the position of a not further shown accelerator pedal for example can be used as a measure for the load La of the combustion engine 10 , as long as the combustion engine 10 is provided as the drive in a motor vehicle. Furthermore a torque provided by the combustion engine 10 can be used as a measure for the load La. Additionally the air amount that is added to the combustion engine 10 and/or an exhaust gas recirculation rate can be considered.
  • the catalytic converter 13 is arranged as SCR-catalyzer, which converts the NOx-parts of the exhaust gas with the reagent ammoniac.
  • the ammoniac can for example be won from a urea/water solution as precursor of the reagent by a thermal decomposition in the exhaust gas region 11 , whereby the urea/water solution is sprayed into the exhaust gas region 11 over the reagent introducing device 12 .
  • the reagent in the shown embodiment the urea/water solution, provides a certain consistency.
  • the urea/water solution is for example assumed to be a 32% urea/water solution.
  • the desired conversion rate cannot be reached anymore, if the water percentage is either accidentally or deceitfully increased, or if a completely wrong reagent is used, so that statutory provisions for the exhaust gas purification are not fulfilled anymore.
  • the procedure according to the invention provides therefore a diagnosis of the reagent or a precursor of the reagent that has to be introduced into the exhaust gas region 11 of the combustion engine 10 .
  • the diagnosis is based on the fact, that a reagent material slack occurs % NH3_nK, which is detected by the exhaust gas sensor 14 and provided as reagent material slack measuring signal NH3_Mes to the control unit 20 , at a higher reagent filling level in the catalyzer 13 , which can store the reagent, and at a simultaneously occurring load change of the combustion engine 10 , which results in an increase of the metering of the reagent.
  • FIG. 2 a shows the time course of the load La.
  • the time course of the load La is shown in FIG. 2 a , whereby it is assumed that the diagnostic method begins at a later point of time ti 1 .
  • a load change detection 30 is provided with the load La, the time ti as well as a load change threshold value dLa/dt_Lim.
  • the load change detection 30 determines a timely load change preferably with the aid of the difference quotient of the load La.
  • FIG. 2 b shows the load change signal dLa/dt depending on the time ti.
  • the first release signal FG 1 can be calculated from applied engine maps of the initial parameters of the load change detection 30 .
  • a reagent filling level determination 32 which is provided the NOx-concentration % NOx_vK, the temperature te_Kat of the catalyzer 13 and the metering signal s_D.
  • the determination of the relative reagent filling level % FS can be taken in detail from the initially mentioned state of the art according to DE 10 2004 031 624 A1, which is clearly referred to.
  • the determination of the relative reagent filling level % FS instead of the absolute reagent filling level is in particular practical because the reagent storage capability of a SCR-catalyzer 13 strongly depends on the temperature, whereby a specific absolute reagent filling level at a low catalyzer temperature te_Kat corresponds with a comparably low relative reagent filling level % FS and at a high catalyzer temperature te_Kat with a comparably high relative reagent filling level % FS.
  • 2 d shows a possible course of the relative reagent filling level % FS, whereby a relative reagent filling level threshold value % FS_Lim is registered, which is exceeded at a second point of time ti 2 .
  • a filling level comparator 34 the relative reagent filling level % FS is compared to the relative reagent filling level threshold value % FS_Lim.
  • the filling level comparator 34 provides a second release signal FG 2 , when the relative reagent filling level % FS exceeds the relative reagent filling level threshold value % FS_Lim.
  • the second release signal FG 2 can be calculated from applied engine maps of the initial parameters of the filling level comparator 34 .
  • the relative filling level threshold value % FS_Lim is thereby for example determined to at least 70%.
  • the exceeding of the relative filling level threshold % FS_Lim occurs according to FIG. 2 d at the second point of time ti 2 and causes the provision of the second release signal FG 2 according to FIG. 2 e.
  • the provided detection and evaluation of the regent material slack % NH3_nK is based on the fact that an overdosing of the reagent can be assumed at a present first and second release signal FG 1 , FG 2 .
  • a reagent material slack comparator 36 compares the reagent material slack measuring signal NH3_Mes with a reagent material slack threshold value NH3_Lim, whereby the reagent material slack comparator 36 provides a first evaluation signal B 1 , when the reagent material slack measuring signal NH3_Mes exceeds the reagent material slack threshold value NH3_Lim.
  • the reagent material slack measuring signal NH3_Mes along with the reagent material slack threshold value NH3_Lim are shown in FIG. 2 f , whereby the exceeding of the reagent material slack threshold value NH3_Lim occurs at a fourth point of time ti 4 .
  • the exceeding causes according to FIG. 2 g the provision of the first evaluation signal B 1 at the fourth point of time ti 4 .
  • a small delay time ti_V is planned preferably between the third and the fourth points of time ti 3 , ti 4 .
  • the delay time ti_V is provided to the reagent material slack comparator 36 .
  • the occurrence of the first evaluation signal B 1 means that an expected reaction occurred, so that is can be assumed that the reagent has a default quality. As long as no first evaluation signal B 1 occurs despite the presence of the two release signals FG 1 , FG 2 , it has to be assumed that the reagent or the precursor of the reagent has no sufficient quality or even that a wrong reagent has been used.
  • an average value comparator 38 is therefore provided, which is provided with the first evaluation signal B 1 , the first and second release signal FG 1 , FG 2 as well as an average threshold value BM_Lim.
  • the average value comparator 38 provides a second evaluation signal B 2 , when an average value of the occurrence or the absence of the first evaluation signal B 1 exceeds the average value threshold BM_Lim.
  • the second evaluation signal B 2 occurs it is assumed that a sufficient quality of the reagent has been present.
  • the reagent threshold value NH3_Lim depends on the load La of the combustion engine 10 and/or on the relative reagent filling level % FS.
  • a reagent material slack threshold determination 40 contains for example engine maps by which the relation is determined.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
US12/377,100 2007-05-14 2008-04-04 Diagnostic method for a reagent material to be introduced into an exhaust gas region of an internal combustion engine and device for performing the method Abandoned US20100170226A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007022594A DE102007022594A1 (de) 2007-05-14 2007-05-14 Diagnoseverfahren für ein in einen Abgasbereich einer Brennkraftmaschine einzubringendes Reagenzmittel und Vorrichtung zur Durchführung des Verfahrens
DE102007022594.8 2007-05-14
PCT/EP2008/054078 WO2008138682A1 (fr) 2007-05-14 2008-04-04 Procédé de diagnostic pour un agent réactif à introduire dans la zone des gaz d'échappement d'un moteur à combustion interne, et dispositif permettant de mettre en œuvre ce procédé

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US20100170226A1 true US20100170226A1 (en) 2010-07-08

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US (1) US20100170226A1 (fr)
EP (1) EP2156024B1 (fr)
CN (1) CN101680336A (fr)
AT (1) ATE516426T1 (fr)
DE (1) DE102007022594A1 (fr)
WO (1) WO2008138682A1 (fr)

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US9575041B2 (en) 2014-03-26 2017-02-21 Automotive Research & Testing Center Gas cross-sensitivity analysis method and system thereof
US9623378B2 (en) 2010-08-18 2017-04-18 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Method for operating an exhaust gas treatment device and motor vehicle having the device
US9737853B2 (en) 2011-07-19 2017-08-22 Daimler Ag Method for determining a quality of a reducing agent solution containing ammonia used to reduce nitrite oxide

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DE102008042763B4 (de) 2008-10-13 2020-01-16 Robert Bosch Gmbh Verfahren zur Diagnose einer Reagenzmittel-Dosiervorrichtung und Vorrichtung zur Durchführung des Verfahrens
DE102008059773A1 (de) * 2008-12-01 2010-06-02 Volkswagen Ag Verfahren zum Betreiben einer SCR-Katalysatoreinrichtung
WO2010093286A1 (fr) * 2009-02-12 2010-08-19 Volvo Lastvagnar Ab Procédé d'actionnement d'un système de post-traitement de gaz d'échappement et système de post-traitement d'échappement
JP5000731B2 (ja) 2010-02-06 2012-08-15 本田技研工業株式会社 内燃機関の排気浄化装置
DE102012206430B4 (de) * 2012-04-19 2015-10-08 Robert Bosch Gmbh Verfahren zur Diagnose eines Dosierventils und Vorrichtung zur Durchführung des Verfahrens
DE102016215864A1 (de) * 2016-08-24 2018-03-01 Robert Bosch Gmbh Verfahren zur Qualitätskontrolle einer Reduktionsmittellösung in einem SCR-Katalysator

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CN101680336A (zh) 2010-03-24
EP2156024A1 (fr) 2010-02-24
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EP2156024B1 (fr) 2011-07-13
WO2008138682A1 (fr) 2008-11-20

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