DE10326932A1 - Process to monitor the condition of a nitric oxide sensor in an automotive exhaust system by comparison of a cold value with a known threshold value - Google Patents

Process to monitor the condition of a nitric oxide sensor in an automotive exhaust system by comparison of a cold value with a known threshold value

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Publication number
DE10326932A1
DE10326932A1 DE2003126932 DE10326932A DE10326932A1 DE 10326932 A1 DE10326932 A1 DE 10326932A1 DE 2003126932 DE2003126932 DE 2003126932 DE 10326932 A DE10326932 A DE 10326932A DE 10326932 A1 DE10326932 A1 DE 10326932A1
Authority
DE
Germany
Prior art keywords
nitrogen oxide
phase
oxide sensor
sensor
nitrogen
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
DE2003126932
Other languages
German (de)
Inventor
Bodo Odendall
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.)
Audi AG
Original Assignee
Audi AG
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 Audi AG filed Critical Audi AG
Priority to DE2003126932 priority Critical patent/DE10326932A1/en
Publication of DE10326932A1 publication Critical patent/DE10326932A1/en
Application status is Ceased legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842Nitrogen oxides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/146Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D41/222Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/021Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems
    • Y02T10/47Exhaust feedback

Abstract

The invention relates to a method for checking a nitrogen oxide sensor of a nitrogen oxide storage catalytic converter having an internal combustion engine for motor vehicles, wherein the internal combustion engine is operated in a lean operating phase with a lean mixture, during this lean operating phase nitrogen oxides are stored in the nitrogen oxide storage catalyst and in the the internal combustion engine is operated in a rich phase or discharge phase with a rich mixture, wherein stored in the nitrogen oxide storage catalyst nitrogen oxides are expelled from the nitrogen oxide storage catalytic converter during this rich operating phase and wherein the switching to the rich operation phase in dependence on a detected by means of the nitrogen oxide sensor Nitrogen oxide is carried out as a nitrogen oxide slip after the nitrogen oxide storage catalyst. According to the invention, at least one nitrogen oxide diagnostic value, which is compared with a predeterminable nitrogen oxide sensor threshold, which is set in such a way that the nitrogen oxide sensor is detected, is detected as the injection phase during a predetermined diagnostic period (A) by means of the nitrogen oxide sensor Reaching or exceeding the nitrogen oxide sensor threshold value is detected as faulty. The invention is based on the finding that the nitrogen oxide storage catalyst at the beginning of the lean operating phase as Einspeicherphase a very low and the aging state almost ...

Description

  • The The invention relates to a method for checking a nitrogen oxide sensor a combustion engine having a nitrogen oxide storage catalyst, in particular an internal combustion engine for motor vehicles according to the preamble of claim 1.
  • Internal combustion engines, the additional operated in a homogeneous mode of operation even in lean operation can be are well known. The lean operation brings in such internal combustion engines but the disadvantage of a significantly larger amount of nitrogen oxide in the exhaust gas with it, so that the nitrogen oxides (NOX) in the lean exhaust gas with a usual Three-way catalytic converter not completely reduced anymore can be. To the nitrogen oxide emissions within prescribed limits, eg. B. the Euro IV limit, Be in conjunction with such internal combustion engine additionally nitrogen oxide storage catalysts used. These nitrogen oxide storage catalysts are operated in such a way that that in it generated by the internal combustion engine in lean operation huge Amounts of nitrogen oxides are stored. With increasing stored Nitrogen oxide becomes a saturation state achieved in the nitrogen oxide storage catalyst, so that the nitrogen oxide storage catalyst must be unloaded. This is for a so-called discharge phase short term by means of the engine control or the engine control unit to a sub-stoichiometric, fat Switched engine operation, in which the internal combustion engine with a fat, a deficient mixture is operated. By this fat operation is the for the amount required to reduce the stored amount of nitrogen oxide introduced to reducing agent in the nitrogen oxide storage catalyst. The storage of the nitrogen oxides located in the lean exhaust gas The nitrogen oxide storage catalyst is usually by a Nitrogen oxide sensor monitors, the local seen after the nitrogen oxide storage catalyst is arranged in the exhaust system. Such a nitrogen oxide sensor is basically with a measurement inaccuracy. Therein, however, lies the problem that Often not possible is, between a small nitrogen oxide slip through the nitrogen oxide storage catalyst through and a measurement inaccuracy or a defect of the nitrogen oxide sensor to distinguish. For example, a measurement inaccuracy or a defect of the nitrogen oxide sensor, the or z. B. by expresses an offset of the measurement signal, erroneously the conclusion of a already significantly aged nitrogen oxide storage catalyst or even allow a defective nitrogen oxide storage catalyst.
  • To avoid these problems, it is from the generic DE 100 49 685 A1 already known to check the functionality of a nitric oxide sensor as part of a so-called on-board diagnosis (OBD). Specifically, for this purpose, a broadband lambda signal characterizing the lambda value of the exhaust gas or a lambda jump signal is determined. These determined values of the lambda signal are compared with lambda values of the exhaust gas which are plausible at given operating parameters, a nitrogen oxide sensor diagnostic signal being formed as a function of the comparison result.
  • Next is also from the DE 100 62 289 A1 a method for the diagnosis of a nitrogen oxide sensor in the exhaust system of an internal combustion engine, in which the nitrogen oxide sensor measures the increase of NH 3 at the beginning of the rich operating phase. If this measured value does not rise steeply, then the nitrogen oxide sensor is detected as defective. As an alternative to this procedure, it is further proposed here to switch to the maximum signal size of the nitrogen oxide sensor, based on the amount of NH 3 in the entire rich operation. Overall, therefore, with these procedures, the cross-sensitivity of the nitrogen oxide sensor to NH 3 is taken into account. A similar procedure is also known from WO 00/00728.
  • task The invention is an alternative method for checking a Nitrogen sensor of a nitrogen oxide storage catalytic converter having Internal combustion engine, in particular an internal combustion engine for motor vehicles, to disposal to provide, with the simple and with high reliability a review of the Nitrogen sensor feasible is.
  • These Task is solved with the features of claim 1.
  • According to claim 1 is by means of the nitrogen oxide sensor only immediately at the beginning the lean operating phase as a storage phase during a predefinable diagnostic period, the much shorter as the entire injection phase, at least one nitric oxide diagnostic value detected, compared with a predetermined nitrogen oxide sensor threshold which is set so that the nitric oxide sensor after reaching or crossing of the nitrogen oxide sensor threshold is detected as faulty.
  • The invention is based on the finding that the nitrogen oxide storage catalyst is direct has at the beginning of the lean phase as Einspeicherphase a very low and almost completely independent of the aging state of the nitrogen oxide storage catalytic nitrogen oxide slip. D. h., According to the invention is exploited here for checking the nitrogen oxide sensor that a new nitrogen oxide storage catalyst as well as z. B. an already very strong aged nitrogen oxide storage catalyst each directly at the beginning of the lean operation phase of the engine and thus the nitrogen oxide storage show a similar to almost identical behavior. This provides a very simple and very reliable method for checking a nitrogen oxide sensor.
  • According to one Particularly preferred concrete process control according to claim 2 is provided, that the diagnosis period from the storage phase start as a lean operation phase start starting less than 10 seconds, preferably less than 7.5 seconds and most preferably less than 5 seconds. These values are especially in the Terms of lean-phase cycles seen in the case of one already very strong aged nitrogen oxide storage catalyst at about a minute lie. In addition, while the nitrogen oxide threshold after Claim 3 in dependence from a certain catalyst temperature and / or an exhaust gas mass flow be determined. For example, as a reference a Exhaust mass of 60 kg per hour and a catalyst temperature of 300 ° C based become.
  • Especially advantageous operating results also result with a process control according to claim 4, which provides for multiple nitrogen oxide sensor thresholds to form threshold comparison ranges are fixed. So, for example, in conjunction with only two threshold comparison ranges within a first, low threshold comparison range lying nitrogen oxide diagnostic value indicate the need for offset correction of the nitric oxide sensor, while This is followed by the second, upper threshold comparison range, which adjoins it at the top Values higher lie as those of the first threshold comparison range, in the case of within this threshold comparison range lying nitrogen oxide diagnostic value the defect of the nitrogen oxide sensor displays.
  • The The invention will be explained in more detail with reference to a drawing.
  • It demonstrate:
  • 1 a schematic plot of nitrogen oxide emissions before and after a new nitrogen oxide storage catalyst in comparison to nitrogen oxide slip,
  • 2 a schematic plot of the nitrogen oxide emissions before and after a nitrogen oxide storage catalyst having a medium degree of aging, compared to the nitrogen oxide slip, and
  • 3 a schematic plot of the nitrogen oxide emissions before and after a nitrogen oxide storage catalyst, which has already aged a lot, compared to the nitrogen oxide slip.
  • In the 1 to 3 are each the nitrogen oxide emissions before and after the nitrogen oxide storage catalyst for a new nitrogen oxide storage catalyst ( 1 ), for a middle-aged nitrogen oxide storage catalyst ( 2 ) and for an already strongly aged nitrogen oxide storage catalyst ( 3 ), the curves 1 respectively the nitrogen oxide emissions before the nitrogen oxide storage catalytic converter, the curves 2 denote the nitrogen oxide slip, ie the amount of nitrogen oxide passing through the nitrogen oxide storage catalyst and not stored, and the curves 3 each denote the nitrogen oxide emissions after the nitrogen oxide storage catalyst.
  • The Periods during which nitrogen oxide emissions range from 400 ppm, put the lean operating phases of the internal combustion engine dar. d. H. while This period is the nitrogen oxide storage catalyst with nitrogen oxides loaded. Those periods of time in which the nitrogen oxide emissions under 10 ppm are those operating phases of the internal combustion engine, in which it is operated with a rich mixture and in which the nitrogen oxide storage catalyst is discharged.
  • A comparison of 1 to 3 clearly shows that with a nitrogen oxide storage catalyst with increasing aging Einspeicherzeiten, ie thus reduce the periods during which the nitrogen oxide storage catalyst can store nitrogen oxide. This means that the nitrogen oxide storage catalyst must be discharged more often by switching to the rich operation with increasing aging.
  • A comparison of 1 to 3 But also shows that, as in the 1 to 3 has been designated only by way of example and schematically with A, the nitrogen oxide storage catalyst immediately at the beginning of storage, ie immediately at the beginning of the lean operating phase has a very low and almost completely independent of the aging state nitrogen oxide slip. Reference symbol A here denotes a predetermined diag nose period of z. B. 5 seconds, during which by means of a nitrogen oxide sensor at least one nitrogen oxide diagnostic value is detected, which is compared with a likewise predetermined nitrogen oxide sensor threshold, the nitrogen oxide sensor threshold is so festgefegt that the nitrogen oxide sensor after reaching or exceeding the Nitrogen sensor threshold is detected as faulty. This nitrogen oxide sensor threshold is stored, for example, in an engine control unit of the internal combustion engine. Should the nitrogen oxide diagnostic value acquired during the diagnostic period from here, for example 5 seconds, reach and / or exceed the nitrogen oxide sensor threshold, ie if the nitrogen oxide sensor indicates nitrogen oxide slip values directly after a successfully performed nitrogen oxide regeneration, which exceeds the defined nitrogen oxide sensor threshold value lie, then it is detected that the nitric oxide sensor provides incorrect values. For example, it can also be determined here that an offset correction can be carried out up to defined threshold values, while from a further threshold the nitrogen oxide sensor can be identified as defective.

Claims (4)

  1. Method for checking a nitrogen oxide sensor of a combustion engine having a nitrogen oxide storage catalytic converter, in particular an internal combustion engine for motor vehicles, in which the internal combustion engine is operated as a lean operating phase for a predeterminable lean operating period with a lean mixture in a first operating phase, during which lean operating phase nitrogen oxides in the nitrogen oxide storage catalytic converter are stored, and in which the internal combustion engine is operated in a further phase of operation as a rich phase or discharge phase for a predetermined Fettbetriebs period with a rich mixture, wherein stored in the nitrogen oxide storage catalyst nitrogen oxides from the nitrogen oxide storage catalyst during this rich operating phase be stored, and wherein the switching to the rich operating phase as the discharge phase as a function of a detected by means of the nitrogen oxide sensor nitrogen oxide value as nitrogen oxide slip after d em nitric oxide storage catalyst is carried out, characterized in that immediately at the beginning of the lean operating phase as Einspeicherphase by means of the nitrogen oxide sensor during a predetermined diagnostic period (A) at least one nitric oxide diagnostic value is detected, which is compared with a predetermined nitrogen oxide sensor threshold value set so is that the nitrogen oxide sensor is detected as defective after reaching or exceeding the nitrogen oxide Sensorschweilwertes.
  2. Method according to claim 1, characterized in that that the diagnosis period (A) starting from Einspeicherphasenbeginn less than 10 seconds, preferably less than 7.5 seconds most preferred less than 5 seconds.
  3. Method according to claim 1 or 2, characterized that the nitrogen oxide threshold depends on a particular Catalyst temperature and / or an exhaust gas mass flow set becomes.
  4. Method according to one of claims 1 to 3, characterized that multiple nitrogen oxide sensor thresholds to form threshold comparison ranges are defined in this way, that one within a first Threshold comparison range lying nitrogen oxide diagnostic value the Indicates the need for the offset correction of the nitrogen oxide sensor, and that a threshold comparison range is provided, its values higher lie than those of the first threshold comparison range, wherein a within this threshold comparison range lying nitrogen oxide diagnostic value indicates the defect of the nitrogen oxide sensor.
DE2003126932 2003-06-16 2003-06-16 Process to monitor the condition of a nitric oxide sensor in an automotive exhaust system by comparison of a cold value with a known threshold value Ceased DE10326932A1 (en)

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DE2003126932 DE10326932A1 (en) 2003-06-16 2003-06-16 Process to monitor the condition of a nitric oxide sensor in an automotive exhaust system by comparison of a cold value with a known threshold value

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DE10326932A1 true DE10326932A1 (en) 2005-01-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009022217A1 (en) * 2007-08-13 2009-02-19 Toyota Jidosha Kabushiki Kaisha Nox sensor malfunction diagnostic device and malfunction diagnostic method
CN104220711A (en) * 2012-04-10 2014-12-17 沃尔沃拉斯特瓦格纳公司 A self-diagnosing method for diagnosing a SCR system

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DE19808382A1 (en) * 1998-02-27 1999-09-02 Volkswagen Ag Controlling a NOx absorber catalyst
DE19847875A1 (en) * 1998-10-16 2000-04-20 Volkswagen Ag De-sulfation of nitrogen oxide storage catalyst following lean-burn common-rail engine comprises checking for exhaustion of capacity and reliability-critical component defects, before initiation
DE19847874A1 (en) * 1998-10-16 2000-04-20 Volkswagen Ag Use of on-board diagnosis apparatus for monitoring nitrogen oxide absorption catalyst regeneration, includes examination of reliability-critical components on detection of anomalies
DE19910664A1 (en) * 1999-03-11 2000-09-14 Volkswagen Ag A method for desulfating an NO x storage catalytic converter
DE10003219A1 (en) * 2000-01-26 2001-08-02 Volkswagen Ag Method and apparatus for controlling a arranged in an exhaust passage of an internal combustion engine NOx storage catalytic converter
DE10003228A1 (en) * 2000-01-26 2001-09-06 Volkswagen Ag Measurement of exhaust nitrogen oxide downstream of storage catalyst, includes stage in which minimum value is found, forming sensor zero calibration signal
DE10039709A1 (en) * 2000-08-14 2002-03-07 Bosch Gmbh Robert Method and control device for determining the state of a nitrogen oxide (NOx) storage catalytic converter
DE10008563A1 (en) * 2000-01-19 2002-05-02 Volkswagen Ag Nitrogen oxide storage catalyst diagnosis process, involving reporting value of characteristics of desorption peak as storage catalyst changes mode

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19808382A1 (en) * 1998-02-27 1999-09-02 Volkswagen Ag Controlling a NOx absorber catalyst
DE19847875A1 (en) * 1998-10-16 2000-04-20 Volkswagen Ag De-sulfation of nitrogen oxide storage catalyst following lean-burn common-rail engine comprises checking for exhaustion of capacity and reliability-critical component defects, before initiation
DE19847874A1 (en) * 1998-10-16 2000-04-20 Volkswagen Ag Use of on-board diagnosis apparatus for monitoring nitrogen oxide absorption catalyst regeneration, includes examination of reliability-critical components on detection of anomalies
DE19910664A1 (en) * 1999-03-11 2000-09-14 Volkswagen Ag A method for desulfating an NO x storage catalytic converter
DE10008563A1 (en) * 2000-01-19 2002-05-02 Volkswagen Ag Nitrogen oxide storage catalyst diagnosis process, involving reporting value of characteristics of desorption peak as storage catalyst changes mode
DE10008564A1 (en) * 2000-01-19 2002-05-02 Volkswagen Ag Nitrogen oxide storage catalyst diagnosis process, involving reporting value of characteristics of desorption peak as storage catalyst changes mode
DE10003219A1 (en) * 2000-01-26 2001-08-02 Volkswagen Ag Method and apparatus for controlling a arranged in an exhaust passage of an internal combustion engine NOx storage catalytic converter
DE10003228A1 (en) * 2000-01-26 2001-09-06 Volkswagen Ag Measurement of exhaust nitrogen oxide downstream of storage catalyst, includes stage in which minimum value is found, forming sensor zero calibration signal
DE10039709A1 (en) * 2000-08-14 2002-03-07 Bosch Gmbh Robert Method and control device for determining the state of a nitrogen oxide (NOx) storage catalytic converter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009022217A1 (en) * 2007-08-13 2009-02-19 Toyota Jidosha Kabushiki Kaisha Nox sensor malfunction diagnostic device and malfunction diagnostic method
US8219278B2 (en) 2007-08-13 2012-07-10 Toyota Jidosha Kabushiki Kaisha NOx sensor malfunction diagnostic device and malfunction diagnostic method
CN101809261B (en) 2007-08-13 2012-09-12 丰田自动车株式会社 NOx sensor malfunction diagnostic device and malfunction diagnostic method
CN104220711A (en) * 2012-04-10 2014-12-17 沃尔沃拉斯特瓦格纳公司 A self-diagnosing method for diagnosing a SCR system
US20150113953A1 (en) * 2012-04-10 2015-04-30 Volvo Lastvagnar Ab Self-diagnosing method for diagnosing a scr system
US9677488B2 (en) * 2012-04-10 2017-06-13 Volvo Lastvagnar Ab Self-diagnosing method for diagnosing a SCR system

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