JP4289736B2 - Method for determining functionality of NOx storage catalyst - Google Patents

Method for determining functionality of NOx storage catalyst Download PDF

Info

Publication number
JP4289736B2
JP4289736B2 JP26889599A JP26889599A JP4289736B2 JP 4289736 B2 JP4289736 B2 JP 4289736B2 JP 26889599 A JP26889599 A JP 26889599A JP 26889599 A JP26889599 A JP 26889599A JP 4289736 B2 JP4289736 B2 JP 4289736B2
Authority
JP
Japan
Prior art keywords
catalyst
nox
process
storage
storage catalyst
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.)
Expired - Fee Related
Application number
JP26889599A
Other languages
Japanese (ja)
Other versions
JP2000104536A (en
Inventor
アンドレアス・ブルーメンシュトック
クラウス・ヴィンクラー
ヨアヒム・ベルガー
レネ・シェンク
Original Assignee
ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングRobert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE19843871.0 priority Critical
Priority to DE1998143871 priority patent/DE19843871B4/en
Application filed by ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングRobert Bosch Gmbh filed Critical ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングRobert Bosch Gmbh
Publication of JP2000104536A publication Critical patent/JP2000104536A/en
Application granted granted Critical
Publication of JP4289736B2 publication Critical patent/JP4289736B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Images

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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9495Controlling the catalytic process
    • 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
    • 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
    • F01N11/007Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
    • 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
    • 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
    • F02D41/02Circuit 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
    • F02D41/1463Introducing 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 of the exhaust gases downstream of exhaust gas treatment apparatus
    • 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
    • F02D41/1493Details
    • F02D41/1495Detection of abnormalities in the air/fuel ratio feedback system
    • 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
    • F01N2550/00Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/03Monitoring or diagnosing the deterioration of exhaust systems of sorbing activity of adsorbents or absorbents
    • 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
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/08Exhaust gas treatment apparatus parameters
    • F02D2200/0806NOx storage amount, i.e. amount of NOx stored on NOx trap
    • 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

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a diagnosis of a NOx storage catalyst by a NOx sensor arranged behind the catalyst in the flow direction.
[0002]
[Prior art]
NOx storage catalysts are used for the conversion of harmful substances in the combustion process within the combustion range of lean fuel / air mixtures (λ> 1). In this range, the three-way catalyst no longer meets the requirements for exhaust gas quality. In this case, NOx storage catalysts are used which store nitrogen oxides released in lean engine operation as well as in gasoline engines as well as in diesel engines. By operating the engine in a rich range (λ <1), the stored nitrate is released and reduced to nitrogen.
[0003]
Ideally, the engine is operated lean in the first process until the NOx storage catalyst is full, i.e. no more nitrogen oxides can be stored. Ideally, this is followed by a second process having a rich operation for the time required for regeneration of the NOx storage catalyst.
[0004]
The active storage location is damaged by the aging of the NOx storage catalyst. Therefore, the storage capacity of the NOx catalyst continuously decreases as the deterioration with time progresses.
German Patent Publication No. 19635977 proposes to monitor the NOx storage catalyst by monitoring the filling degree at that time. Data on the degree of filling at that time, that is, the degree of filling of the NOx storage catalyst with nitrogen oxides, is used for control purposes. When the current storage charge measurement indicates that the storage capacity is full, a rich pulse is generated, i.e. engine operation with the rich mixture for regeneration of the storage catalyst is started.
[0005]
From SAE Paper 960334, a NOx sensor with a substantially linear signal characteristic is known.
Regulatory requirements stipulate onboard diagnostics for automotive components such as catalysts associated with hazardous emissions.
[0006]
When degraded, the active storage location of the NOx storage catalyst is damaged, thereby reducing the storage and release characteristics of the NOx catalyst. In addition to deterioration due to heat, poisoning due to, for example, sulfur uptake occurs. At this time, the catalyst will store less nitrate than in the fresh state. Thus, catalyst back-emission increases and regeneration must occur frequently to maintain the same average conversion capacity.
[0007]
[Problems to be solved by the invention]
It is an object of the present invention to provide a method for determining the functionality of a NOx storage catalyst.
[0008]
[Means for Solving the Problems]
The problem is that the exhaust gas is adjusted to contain more NOx in the first process than in the second process, and the exhaust gas is adjusted to contain a reducing agent in the second process. NOx catalyst in a method for determining the functionality of a NOx storage catalyst to which exhaust gas is supplied from a combustion process, using a NOx sensor disposed at the rear of the NOx storage catalyst in the flow direction, wherein repetitive switching from the first process to the second process is performed Is determined based on the NOx sensor signal, and is solved by the NOx storage catalyst functionality determination method of the present invention.
[0009]
The present invention is based on the finding that the decrease in functionality of the NOx storage catalyst is represented in a NOx concentration time diagram that can be measured behind the catalyst.
When the functionality is reduced due to deterioration at a predetermined NOx supply mass intake amount mno1, the catalyst rearward nitrogen oxide emission mno2 rises. This relationship can be used for diagnosis.
[0010]
For example, during storage, the measurable NOx concentration behind the catalyst increases more and more rapidly with the progress of catalyst degradation. During the regeneration process, the measurable NOx concentration behind the catalyst decreases more and more rapidly with the progress of catalyst degradation. In other words, the slope of the NOx concentration measured behind the catalyst becomes steeper as the catalyst progresses.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows in detail the catalyst 2, exhaust gas sensor 3, NOx sensor 4, control device 5, fuel supply means 6 and other internal combustion engines such as load L and rotational speed n and possibly temperature, throttle valve position, etc. 1 shows an internal combustion engine 1 with various sensors 7, 8, 9 for operating parameters and an error lamp 10, for example as an error indication means and / or storage means.
[0012]
From the said input signal and possibly other input signals, the control device 5 forms a fuel supply signal, in particular for operating the fuel supply means 6. The fuel supply means 6 may be formed not only as so-called intake pipe injection but also as direct injection of gasoline or diesel into the combustion chambers of the individual cylinders. The mixture composition may be changed by changing the injection pulse width for operating the fuel supply means 6.
[0013]
The essence of the method according to the invention firstly relates in this environment to the cooperation of the control device 5 and the NOx sensor 4 arranged behind the catalyst.
FIG. 2 is a signal characteristic diagram (FIG. 2A) of the NOx sensor 4 disposed behind the catalyst and an attached air-fuel ratio λ (FIG. 2) measured by the exhaust gas sensor 3 disposed in front of the catalyst. 2 (B)) shows the process switching.
[0014]
Assume that at time t = 0, the NOx storage catalyst is empty. In the subsequent first phase Ph1, the internal combustion engine is operated with a lean mixture (λ> 1). This corresponds to step 3.1 in FIG. The nitrogen oxides released in this case are stored in the storage catalyst. Ideally, the first process (lean process), also called a storage process, is terminated when the storage catalyst 2a is full.
[0015]
In this case, the storage catalyst is considered full when the NOx sensor signal reaches, for example, the upper threshold UL. See step 3.2 in FIG.
This first process is followed by a second process Ph2, in which the storage catalyst is regenerated, which is represented by step 3.3 in FIG. The second process is also called a regeneration process. In this embodiment, the regeneration is performed by a rich engine operation in which the λ value in the process Ph2 is smaller than 1. In this case, an internal combustion engine operating with a fuel rich mixture releases unburned HC and CO as a reducing agent. Under the action of the catalyst, the reducing agent reacts with the nitrogen oxides being stored to produce water, CO 2 and N 2, water, CO 2 and N 2 is discharged together with the exhaust gases. This allows the storage catalyst to newly accept nitrogen oxides, i.e., be regenerated. During regeneration, the NOx content of the exhaust gas behind the storage catalyst gradually decreases. As soon as the NOx sensor signal reaches the lower threshold LL, the shift to lean operation and new storage of NOx in the storage catalyst are performed. See step 3.4 in FIG. Switching between the processes Ph1 and Ph2 is performed continuously by the control device 5.
[0016]
Deterioration shortens storage time and regeneration time. This is shown schematically in FIG. 2 by shortening the period. In practice, this shortening is very slow. On the other hand, the positions of the upper threshold and the lower threshold remain constant.
[0017]
Steady increases and decreases in NOx concentration behind the storage catalyst are characteristic of the known NOx storage catalyst. Since the storage rate of NOx continuously decreases as the degree of filling increases, the concentration of NOx in the exhaust gas that can be measured behind the storage catalyst increases as the degree of filling increases.
[0018]
The concept of diagnosis is based on the measurement of NOx emission behind the catalyst by a NOx sensor.
In the first embodiment, the measurement of the curve diagram shown in FIG. 2 in the fresh state, the storage of this curve diagram, the measurement of the curve diagram at a later time, and the curve diagram obtained later are stored. Comparison with the existing curve diagram is performed. If the deviation exceeds a predetermined scale, the catalyst is considered degraded.
[0019]
The curve diagram shown in FIG. 2 can be reconstructed from a pair of predetermined characteristic values of the NOx concentration at a predetermined time, for example. The pair of characteristic values are represented by, for example, inversion points O1, O2,..., U1, U2,.
[0020]
Instead of comparing a number of individual points on a curve, for example, the slope of the curve, ie the quotient of the difference between two NOx values and the time interval at which these values were measured, may be evaluated. For example, the gradient G in the release or regeneration process can be calculated by G = (LL−UL) / (t2−t1). See steps 4.1 and 4.2 in FIG.
[0021]
In step 4.3, the slope is compared with a predetermined limit value G_Schwell. If this limit value is exceeded, an error indication is given by the warning lamp MIL (reference numeral 10 in FIG. 1) after optionally performing a statistical test in step 4.4.
[0022]
The limit value can be determined as follows, for example. An initial gradient G0 is determined for the new catalyst. The limit value is determined as an offset or a factor of eg 1.5 times the initial slope.
[0023]
Instead of storing an initial curve diagram, a curve diagram may be modeled. When based on a functional catalyst, an expected value for the NOx concentration behind the catalyst can be formed from engine operating parameters such as a diagram of load, rotational speed, λ, and λ value in front of the catalyst. If the actual measured NOx concentration is unacceptably different from the modeled diagram, this is evaluated as an indication for a degraded catalyst.
[0024]
The slope may be determined and evaluated separately for storage and regeneration processes, or may be determined as the average value of the slope in both processes over one or more cycles of storage and regeneration.
[0025]
Similarly, the length of one or more storage or regeneration processes, the period time of a storage / regeneration cycle, or the frequency of periodic NOx concentration oscillations may be used as a measure for the slope.
[0026]
For example, the length of the regeneration process is determined both by the release potential of the stored catalyst. In this case, the starting point is that the NOx concentration decreases according to the characteristic time diagram during the regeneration when λ is 1 or less. Thereby, the maximum allowable reproduction time can be defined. When the regeneration time exceeds a predetermined allowable regeneration time without the NOx concentration falling below the threshold, the catalyst is considered degraded.
[0027]
Other embodiments are based on the formation of instantaneous NOx mass flow or integrated NOx mass flow behind the catalyst. The NOx mass flow mno2 behind the catalyst can be evaluated based on the NOx concentration measured behind the catalyst, optionally using the intake mass flow (sensor 7) or load signal and / or rotational speed signal simultaneously.
[0028]
The supplied mass take-in amount mno1 into the catalyst can be evaluated by a model. Therefore, the bench test determines the nitrogen oxide supply emission of an engine without using exhaust gas aftertreatment means for one model series engine, stores it in the characteristic curve group, and the other engine of this model series. It can be used for modeling in later driving.
[0029]
The quotient mno2 / mno1 or the integral quotient of these values is a measure for the storage capacity of the catalyst as a function of degradation. When the storage catalyst is healthy, this quotient is ideally equal to zero. As the deterioration progresses, the quotient approaches a value of 1, at which the inlet and outlet emissions are equal, indicating a complete reduction in conversion capacity. A healthy catalyst and a deteriorated catalyst can be distinguished from each other by a predetermined limit value determined in order to satisfy legal regulations.
[0030]
Values are calculated only in stratified operation, but the others are independent of the operating point. The stratified operation is an operation having stratified filling in the cylinder. This is understood as a spatially non-uniform fuel / air mixture composition within the cylinder. For example, the mixture in the spark plug region is rich to ensure reliable ignition and in other regions it is lean to reduce fuel consumption. On average, in stratified operation, the mixture is lean (1 <λ <about 3). For example, operation with a homogeneous mixture distribution that produces high power is distinguished from this.
[0031]
Integral formation has the advantage of being very insensitive with respect to disturbances such as sensor signal changes or NOx feed mass changes and thus represents an advantageous method that is not affected by disturbances. Furthermore, by limiting the amount of feed mass taken into the catalyst for NOx, model formation is reduced, which in turn makes the method unaffected by disturbances.
[0032]
Furthermore, on the assumption that the catalyst has functionality, the filling amount, that is, the filling degree, can be calculated from the supplied mass intake amount. As noted above, storage capacity decreases with increasing fill. Therefore, the NOx emission behind the catalyst rises as the filling amount increases. A validity comparison between the calculated charge and the measured NOx concentration behind the catalyst can be used for diagnosis as well.
[0033]
When the NOx concentration exceeds a reasonable measure, for example with respect to the calculated charge, the catalyst is degraded.
In all examples, it is common that a NOx sensor is used behind the catalyst for diagnosis. The characteristic value of the NOx concentration behind the catalyst is derived from the NOx sensor signal.
[Brief description of the drawings]
FIG. 1 is a technical peripheral view showing the operation of the present invention.
FIG. 2A is a signal time diagram of a NOx sensor disposed behind a catalyst in various aging states of the catalyst, and FIG. 2B is an accessory measured by an exhaust gas sensor disposed in front of the catalyst. FIG. 6 is a time diagram of the air-fuel ratio λ.
FIG. 3 is a flow diagram illustrating an example of a mixture control scheme adapted to the function of the NOx storage catalyst.
FIG. 4 is a flowchart of an embodiment showing the process of the method according to the present invention.
[Explanation of symbols]
1 Internal combustion engine 1a Combustion chamber 2 Catalyst 2a First part of catalyst (NOx storage catalyst)
2b Second part of catalyst 3 Exhaust gas sensor 4 NOx sensor 5 Control device 6 Fuel supply means 7, 8, 9 Sensor 10 Error lamp (alarm lamp)

Claims (1)

  1. The exhaust gas is adjusted to contain a larger amount of NOx in the first process than in the second process, and the exhaust gas is adjusted to contain a reducing agent in the second process. In a method for determining the functionality of a NOx storage catalyst to which exhaust gas is supplied from a combustion process, by a NOx sensor arranged at the rear of the NOx storage catalyst in the flow direction, wherein the NOx catalyst functionality is determined. The determination based on the NOx sensor signal, the filling state of the catalyst with nitrogen oxides from the engine and catalyst operating parameters are modeled, and the expectation for the NOx concentration behind the catalyst from the modeled filling state A value is formed and compared with the NOx concentration measured behind the catalyst and at least one deviation between the expected value and the measured value exceeds the threshold Come, the functionality of the determination method of the NOx storage catalyst, wherein the the catalyst is evaluated to have deteriorated, the.
JP26889599A 1998-09-25 1999-09-22 Method for determining functionality of NOx storage catalyst Expired - Fee Related JP4289736B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19843871.0 1998-09-25
DE1998143871 DE19843871B4 (en) 1998-09-25 1998-09-25 Diagnosis of a NOx storage catalytic converter with downstream NOx sensor

Publications (2)

Publication Number Publication Date
JP2000104536A JP2000104536A (en) 2000-04-11
JP4289736B2 true JP4289736B2 (en) 2009-07-01

Family

ID=7882137

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26889599A Expired - Fee Related JP4289736B2 (en) 1998-09-25 1999-09-22 Method for determining functionality of NOx storage catalyst

Country Status (3)

Country Link
JP (1) JP4289736B2 (en)
DE (1) DE19843871B4 (en)
GB (1) GB2342597B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101877641B1 (en) * 2016-11-29 2018-07-11 재단법인 자동차융합기술원 Degrading apparatus of catalyst using oxidation catalyst

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19922981A1 (en) * 1999-05-19 2000-11-30 Bosch Gmbh Robert A method for monitoring the soundness of a NO¶x¶ storage catalyst
DE10023080B4 (en) * 2000-05-11 2009-10-22 Volkswagen Ag Method and device for monitoring a storage capacity of a NOx storage catalytic converter
DE10036453A1 (en) * 2000-07-26 2002-02-14 Bosch Gmbh Robert Operating a nitrogen oxide storage catalyst on vehicle IC engine comprises storing nitrogen oxides generated from the engine in first phase in storage catalyst
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
US6698188B2 (en) 2000-12-08 2004-03-02 Toyota Jidosha Kabushiki Kaisha Emission control apparatus of internal combustion engine
JP3649130B2 (en) * 2001-01-22 2005-05-18 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
DE10300555B4 (en) * 2002-01-10 2009-03-19 Toyota Jidosha Kabushiki Kaisha, Toyota-shi A deterioration determination device for an engine exhaust gas control device and deterioration determination method
DE10226873B4 (en) * 2002-06-12 2012-05-31 Volkswagen Ag Method for controlling the mode selection of an internal combustion engine
DE10258876A1 (en) * 2002-12-06 2004-08-19 Volkswagen Ag Method and device for diagnosing a NOx storage catalytic converter when the vehicle is stationary
DE10305452B4 (en) * 2002-12-30 2013-04-18 Volkswagen Ag Method for diagnosing a catalyst in the exhaust gas flow of an internal combustion engine and device for carrying out the method
DE10302700B4 (en) * 2002-12-31 2013-01-17 Volkswagen Ag Method and device for diagnosing a NOx storage catalytic converter in the exhaust gas tract of an internal combustion engine
ITBO20030136A1 (en) * 2003-03-13 2004-09-14 Magneti Marelli Powertrain Spa the ability 'method for the degradation estimate
DE10312440B4 (en) * 2003-03-20 2006-04-06 Siemens Ag Emission control method for lean-burn engines
DE10313216B4 (en) * 2003-03-25 2012-07-12 Robert Bosch Gmbh Method for operating a nitrogen oxide (NOx) storage catalytic converter arranged in the exhaust region of an internal combustion engine
JP2005273653A (en) * 2004-02-27 2005-10-06 Nissan Motor Co Ltd Deterioration diagnosis device for filter
DE102004049577A1 (en) * 2004-10-12 2006-04-20 Robert Bosch Gmbh Method for operating an internal combustion engine, in whose exhaust gas area a NOx storage catalytic converter and a NOx sensor are arranged, and apparatus for carrying out the method
DE102005050517A1 (en) * 2005-10-21 2007-04-26 Umicore Ag & Co. Kg Method for operating a nitrogen oxide storage catalytic converter on a diesel engine
JP4737010B2 (en) * 2006-08-30 2011-07-27 トヨタ自動車株式会社 Catalyst deterioration diagnosis device
DE102007009840B4 (en) 2007-03-01 2018-11-22 Robert Bosch Gmbh Method for determining a malfunction of a device for metering fuel
JP4729518B2 (en) * 2007-03-07 2011-07-20 トヨタ自動車株式会社 NOx catalyst deterioration diagnosis device
JP4349425B2 (en) 2007-03-19 2009-10-21 日産自動車株式会社 NOx catalyst diagnostic device
FR2942502A1 (en) * 2009-02-24 2010-08-27 Peugeot Citroen Automobiles Sa Nitrogen oxide controlling method for oil engine of motor vehicle, involves operating engine according to calibration so as to provoke reduction of nitrogen oxide production source, when engine is placed in specific environment
GB2502797A (en) * 2012-06-06 2013-12-11 Gm Global Tech Operations Inc Method of assessing the thermal ageing of a catalyst in an exhaust system
KR101406495B1 (en) * 2012-12-17 2014-06-27 현대자동차주식회사 Lnt control method for vehicle

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69326217T3 (en) * 1992-06-12 2009-11-12 Toyota Jidosha Kabushiki Kaisha, Toyota-shi Exhaust emission control system for internal combustion engines
JP3316066B2 (en) * 1993-12-22 2002-08-19 富士重工業株式会社 Trouble diagnosis device for an exhaust gas purifying device
JP3633055B2 (en) * 1995-09-27 2005-03-30 日産自動車株式会社 Engine diagnostic equipment
DE19543219C1 (en) * 1995-11-20 1996-12-05 Daimler Benz Ag Diesel engine operating method
US5704339A (en) * 1996-04-26 1998-01-06 Ford Global Technologies, Inc. method and apparatus for improving vehicle fuel economy
DE19635977A1 (en) * 1996-09-05 1998-03-12 Bosch Gmbh Robert Sensor for monitoring an NOx catalyst
US5771685A (en) * 1996-10-16 1998-06-30 Ford Global Technologies, Inc. Method for monitoring the performance of a NOx trap
DE19800665C1 (en) * 1998-01-10 1999-07-01 Degussa Method for operating a nitrogen oxide storage catalyst
JP3456401B2 (en) * 1998-02-12 2003-10-14 日産自動車株式会社 Exhaust gas purification device for internal combustion engine
DE19816175A1 (en) * 1998-04-14 1999-10-21 Degussa A method for checking the function of a nitrogen oxide storage catalyst

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101877641B1 (en) * 2016-11-29 2018-07-11 재단법인 자동차융합기술원 Degrading apparatus of catalyst using oxidation catalyst

Also Published As

Publication number Publication date
GB9921660D0 (en) 1999-11-17
JP2000104536A (en) 2000-04-11
GB2342597A (en) 2000-04-19
DE19843871A1 (en) 2001-08-02
GB2342597B (en) 2001-09-05
DE19843871B4 (en) 2005-05-04

Similar Documents

Publication Publication Date Title
JP3674017B2 (en) Catalyst degradation detection device for exhaust gas purification
US7198952B2 (en) Catalyst deterioration detecting apparatus and method
US6167695B1 (en) Method and system for diagnosing deterioration of NOx catalyst
US7117665B2 (en) Catalyst degradation determining method
US5724808A (en) Air-fuel ratio control system for internal combustion engines
US6216451B1 (en) Method of diagnosing an NOx storage catalytic converter during operation of an internal combustion engine
DE4339299C2 (en) Device and method for periodically monitoring the catalytic converter efficiency on an internal combustion engine
US6594987B2 (en) Apparatus for detecting fault in exhaust system of internal combustion engine
US5426934A (en) Engine and emission monitoring and control system utilizing gas sensors
US20010054282A1 (en) Apparatus and method for monitoring NOx storage catalytic converters
EP1228301B1 (en) Method of monitoring the exhaust catalyst of an internal combustion engine
US6497092B1 (en) NOx absorber diagnostics and automotive exhaust control system utilizing the same
JP2858288B2 (en) Self-diagnosis apparatus in an air-fuel ratio control apparatus for an internal combustion engine
JP2004100700A (en) Exhaust emission control and its diagnosis
JP4436472B2 (en) Method and apparatus for diagnosing catalyst in exhaust gas of internal combustion engine
JP3649034B2 (en) Engine exhaust purification system
JP3858554B2 (en) Engine exhaust purification system
US6389802B1 (en) Method and arrangement for operating an internal combustion engine in combination with an NOx storage catalytic converter and an NOx sensor
US6453663B1 (en) NOx sensor monitoring
US6990854B2 (en) Active lean NOx catalyst diagnostics
EP1060003B1 (en) CONTROL OF AN NOx-ABSORBING CATALYTIC CONVERTER
CN101205825B (en) The internal combustion engine system and a method for determining operating conditions of the exhaust gas treatment device in the system of
EP1097299B1 (en) METHOD FOR CHECKING THE EFFICIENCY OF AN NOx ACCUMULATION CATALYST
US6843240B1 (en) Method for monitoring the functioning of a NOx sensor arranged in an exhaust gas channel of an internal combustion engine
EP1117917B1 (en) METHOD FOR REGENERATING AN NOx STORAGE CATALYTIC CONVERTER

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060920

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20080630

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080714

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20081009

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20090302

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20090331

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120410

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130410

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140410

Year of fee payment: 5

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees