[go: up one dir, main page]

WO2008088285A1 - Procédé et dispositif de surveillance du fonctionnement d'un système de post-traitement des gaz d'échappement - Google Patents

Procédé et dispositif de surveillance du fonctionnement d'un système de post-traitement des gaz d'échappement Download PDF

Info

Publication number
WO2008088285A1
WO2008088285A1 PCT/SE2008/050048 SE2008050048W WO2008088285A1 WO 2008088285 A1 WO2008088285 A1 WO 2008088285A1 SE 2008050048 W SE2008050048 W SE 2008050048W WO 2008088285 A1 WO2008088285 A1 WO 2008088285A1
Authority
WO
WIPO (PCT)
Prior art keywords
curve
magnitude
parameter
values
evaluation period
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
PCT/SE2008/050048
Other languages
English (en)
Inventor
Lars Eriksson
Gustav Arrhenius
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.)
Scania CV AB
Original Assignee
Scania CV AB
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 Scania CV AB filed Critical Scania CV AB
Priority to DE112008000223.1T priority Critical patent/DE112008000223B4/de
Publication of WO2008088285A1 publication Critical patent/WO2008088285A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F01N11/005—Monitoring or diagnostic devices for exhaust-gas treatment apparatus the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus the temperature or pressure being estimated, e.g. by means of a theoretical model
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • 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
    • F01N2550/02—Catalytic activity of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/703—Atmospheric pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/068—Introducing corrections for particular operating conditions for engine starting or warming up for warming-up
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a method and an arrangement for monitoring the functioning of an exhaust gas aftertreatment system of a motor vehicle based on measuring values from a sensor as to the magnitude of a parameter related to exhaust gases flowing out of an exhaust gas aftertreatment appliance, for instance in the form of a catalyst or a filter, included in the exhaust gas aftertreatment system.
  • the invention also relates to a method and an arrangement for generating lookup values to be used for monitoring the functioning of an exhaust gas aftertreat- ment system of a motor vehicle.
  • the invention relates to computer programs comprising computer program code for implementing methods according to the invention, a computer program product comprising a data storage medium readable by an electronic control unit and having such a computer program stored thereon, and an electronic control unit.
  • SCR Selective Catalytic Reduction
  • a method for monitoring an SCR catalyst is previously known from WO 2004/109072 A1 .
  • a temperature value representing the temperature of exhaust gases flowing out of the SCR catalyst is calculated by means of a cal- culation model and compared with a temperature value measured in the exhaust line downstream of the SCR catalyst. Based on the correspondence between these temperature values, such as for instance the difference between them, it is established whether or not the SCR catalyst and its injection device are functioning in a satisfying and expected manner. Similar methods are also previously known from DE 4 122 787 A1 , US 5 860 277 A and EP 0 756 071 A2.
  • a problem associated with this type of monitoring methods relying on a calculation model is that the calculation model normally might give rather correct calculation values but at some operating conditions might give calculation values deviating substantially from the corresponding real values. Thus, incorrect fault indications might be generated based on test samples recorded during the last mentioned operating conditions.
  • the functioning of an SCR catalyst may also be monitored by means of a NO x sensor arranged to measure the NO x content in the exhaust gases downstream of the catalyst.
  • This NO x sensor may be supplemented by another NO x sensor arranged to measure the NO x content in the exhaust gases upstream of the catalyst in order to provide a comparison value.
  • a NO x sen- sor is an expensive component and one option for dispensing with a NO x sensor upstream of the catalyst is to use a calculation model for calculating the amount of NO x produced by the vehicle engine.
  • another calculation model may be used for calculating the expected conversion of NO x in the catalyst so as to obtain calculated values of the NO x content in the exhaust gases downstream of the catalyst.
  • calculated values may then be compared with the measuring values from the NO x sensor downstream of the catalyst in order to detect possible disorders of the catalyst and the associated equipment.
  • the use of calculation models for calculating the magnitude of the NO x content in the exhaust gases may however give calculation values deviating substantially from the corresponding real values, which in its turn may result in the generation of incorrect fault indications.
  • a first object of the present invention is to propose a new and reliable manner of monitoring an exhaust gas aftertreatment system of a motor vehicle.
  • the functioning of the exhaust gas aftertreatment system is monitored based on measuring values from a sensor as to the magnitude of a parameter related to exhaust gases flowing out of an exhaust gas aftertreatment appliance, for instance in the form of a catalyst or a filter, included in the exhaust gas aftertreatment system.
  • a first curve is established based on measuring values from the sensor as to the magnitude of the parameter during a certain period of time, which is here denominated evaluation period, this first curve representing the measured magnitude of the parameter as a function of time during the evaluation period;
  • a second curve is established based on values of the magnitude of the parameter during the evaluation period calculated by means of a calculation model, this second curve representing the calculated magnitude of the parameter as a function of time during the evaluation period;
  • the second curve is compared with the first curve in order to establish whether or not the curve shape of the second curve resembles the curve shape of the first curve;
  • - information regarding the functioning of the exhaust gas after- treatment system is generated based on measuring values from the sensor and corresponding calculation values from the calculation model as to the magnitude of the parameter during the evaluation period, only if it is established by said comparison that the curve shape of the second curve resembles the curve shape of the first curve.
  • the expression "the curve shape of the second curve resembles the curve shape of the first curve” implies that the curves change in an approximately similar manner, at approximately the same time, in the same direction and approximately to the same extent, i.e. that the changes of the second curve essentially follow the changes of the first curve. If the curve shape of the second curve resembles the curve shape of the first curve, the second curve will consequently rise when the first curve rises and fall when the first curve falls, and with approximately the same absolute value. However, that the curve shape of the second curve resembles the curve shape of the first curve does not imply that the curves have to overlap or coincide. On the contrary, there may be an approximately constant offset in absolute value between the curves, even though the curve shape of the second curve resembles the curve shape of the first curve.
  • information re- garding the functioning of the exhaust gas aftertreatment system is generated based on measuring values from the sensor and corresponding calculation values from the calculation model as to the magnitude of the parameter during the evaluation period, only on condition that it is established that the engine of the ve- hide is running under steady-state operating conditions during the evaluation period.
  • a calculation model normally reflects the effects of an exhaust gas aftertreatment system on a specific parameter with better accuracy during steady-state operating conditions as compared to transient operating conditions.
  • steady-state operating conditions refers to a situation when the engine of the vehicle is running at steady-state with stable engine load and stable rotational speed. Appropriate criteria for stable engine load and stable rotational speed may easily be set by a person skilled in the art from case to case depending on the type of vehicle and the type of engine in question.
  • the second curve is compared with the first curve by means of a curve comparison model or curve recognition model which is designed to compare the gradient and/or absolute value of the second curve at certain points of time during the evaluation period with the gradient and/or absolute value of the first curve at the corre- sponding points of time so as to thereby establish whether or not the curve shape of the second curve resembles the curve shape of the first curve. It has been found that this type of model may by favourable for use in this connection.
  • measuring values from the sensor and corresponding calculation values from the calculation model as to the magnitude of the parameter during the evaluation period are evaluated in order to form a correspondence value representing the correspondence between said measuring values and calculation values during the evalua- tion period, and information regarding the functioning of the exhaust gas aftertreatment system is generated based on this correspondence value.
  • the correspondence value is suitably formed so as to represent the correspondence between the mean value of said measuring values from the sensor and the mean value of said calculation values from the calculation model during the evaluation period or during a part thereof.
  • information regarding the functioning of the exhaust gas aftertreatment system is generated by comparing said correspondence value with a lookup value, which has been stored associated with an engine operating point corresponding to the engine operating point prevailing during the evaluation period and which has been generated based on one or several correspondence values previously established for this engine operating point with the same engine in the same manner as the present correspondence value and with the same sensor and calculation model.
  • a lookup value which has been stored associated with an engine operating point corresponding to the engine operating point prevailing during the evaluation period and which has been generated based on one or several correspondence values previously established for this engine operating point with the same engine in the same manner as the present correspondence value and with the same sensor and calculation model.
  • a fault indication is suitably generated if the difference or ratio between the new correspondence value and the previously stored lookup value exceeds a threshold value so as to thereby indicate a functional disorder of the exhaust gas aftertreatment system.
  • engine operating point refers to a “point” with a certain combination of engine load and engine rotational speed. Each engine operating point is associated with an engine load of a specific magnitude and an engine rotational speed of a specific magni- tude.
  • a second object of the present invention is to propose a new and reliable manner of generating lookup values to be used for monitoring the functioning of an exhaust gas aftertreatment sys- tern of a motor vehicle which is provided with a sensor for measuring the magnitude of a parameter related to exhaust gases flowing out of an exhaust gas aftertreatment appliance, for instance in the form of a catalyst or a filter, included in the exhaust gas aftertreatment system.
  • a first curve is established based on measuring values from the sensor as to the magnitude of the parameter during a certain pe- riod of time, which is here denominated evaluation period, this first curve representing the measured magnitude of the parameter as a function of time during the evaluation period;
  • a second curve is established based on values of the magnitude of the parameter during the evaluation period calculated by means of a calculation model, this second curve representing the calculated magnitude of the parameter as a function of time during the evaluation period;
  • the second curve is compared with the first curve in order to establish whether or not the curve shape of the second curve re-muls the curve shape of the first curve;
  • a lookup value for the engine operating point in question is generated based on measuring values from the sensor and corre- sponding calculation values from the calculation model as to the magnitude of the parameter during the evaluation period.
  • lookup values are intended to be generated when the engine and the exhaust gas aftertreatment system are considered to be faultless, for instance when the vehicle is new or rather new, and they are to be used as comparison values to be compared with corresponding values established later on during the lifetime of the vehicle in order to detect abnormal deviations that may be caused by a functional disorder of the exhaust gas after- treatment system.
  • measuring values from the sensor and corresponding calculation values from the calculation model as to the magnitude of the parameter during the evaluation period are evaluated in order to form a correspondence value representing the correspondence between said measuring values and corresponding calculation values during the evaluation period, and the lookup value is then generated based on this correspondence value.
  • each lookup value reflects a previously established correspondence between measuring values and corresponding calculation values established for a certain engine operating point.
  • an initial lookup value generated for a certain engine operating point based on one or several initial correspondence values is updated based on one or several subsequent correspondence values established for the engine operating point in question.
  • the lookup values may be adjusted so as to compensate for the drifting of the sensor in course of time.
  • each such subsequent correspondence value is made to affect the magni- tude of the lookup value to an extent that is made to decrease as the accumulated operating time of the vehicle engine increases.
  • the respective correspondence value is formed so as to represent the correspondence between the mean value of said measuring values from the sensor and the mean value of said calculation values from the calculation model during the evaluation period or during a part thereof.
  • the invention also relates to a computer program having the features defined in claim 14 and claim 24, respectively, a computer program product having the features defined in claim 25 and an electronic control unit having the features defined in claim 26.
  • Fig 1 is a schematic diagram of a combustion engine with an associated exhaust gas aftertreatment system, illustrating an embodiment of an arrangement accord- ing to the present invention
  • Fig 2 is a schematic outline diagram of an electronic control unit for implementing a method according to the invention
  • Fig 3 is a flow diagram illustrating a method according to the invention.
  • Fig 4 is a flow diagram illustrating another method according to the invention.
  • an inventive method and arrangement will in the following be described as implemented to monitor the functioning of an exhaust gas aftertreatment system comprising a catalyst.
  • the invention is in no way limited to these utilizations.
  • the invention may be utilized for monitoring an exhaust gas aftertreatment system having any type of exhaust gas aftertreatment appliance that has an effect on the magnitude of an ex- haust gas parameter, which can be measured by a sensor and simultaneously calculated on the basis of a calculation model.
  • the invention may e.g. be used for monitoring the functioning of an exhaust gas aftertreatment system comprising an exhaust gas aftertreatment appliance in the form of a filter, such as a particle filter or an open structure filter.
  • a combustion engine 1 with an associated exhaust gas after- treatment system 2 are schematically shown in Fig 1 .
  • the exhaust gases leaving the combustion engine 1 are conveyed through an exhaust line 3 and are discharged into the surroundings via an exhaust outlet 4.
  • a catalyst 5 is arranged in the exhaust line 3. The exhaust gases from the combustion engine 1 will pass the catalyst 5 before being discharged into the surroundings via the exhaust outlet 4.
  • the catalyst 5 is an SCR catalyst.
  • reducing agent is injected by means of an injection device 6 into the exhaust gases in the exhaust line 3 upstream of the catalyst 5.
  • the injection device 6 comprises one or several injection members 7 in the form of injection nozzles or the like arranged in the exhaust line 3, and a reducing agent storage container 8 connected thereto.
  • the injection device 6 also comprises a regulating member 9, e.g. in the form of a control valve, arranged to regulate the supply of reducing agent to said one or several injection members 7, and a control means 10 connected to the regulating member 9.
  • the regulating member 9 is controlled by said control means 10, which determines, on the basis of the prevailing operating conditions of the combustion engine 1 and the catalyst 5, the amount of reducing agent to be injected into the exhaust gases.
  • the injection device 6 may also comprise further components, such as a dosing appliance etc.
  • the reducing agent may for instance be urea (CO(NH 2 ) 2 ), ammonia (NH 3 ) or hydrocarbon (fuel) or any other suitable reducing agent.
  • a sensor 1 1 is arranged in the exhaust line 3 downstream of the catalyst 5 in order to generate measuring values as to the magnitude of a parameter related to exhaust gases flowing out of the catalyst 5.
  • the sensor 1 1 is a NO x sensor arranged to generate measuring values representing the NO x content in the exhaust gases flowing out of the catalyst 5, i.e. the NO x content in the exhaust gases at the outlet of the catalyst. The measuring values are recorded so as to form a series of consecutive and discrete measuring values as to the magnitude of the parameter.
  • the inventive arrangement 20 comprises calculation means 21 adapted to calculate values representing the magnitude of the parameter in question.
  • the calculation values constitute theoretically established values of the magnitude of the parameter at the outlet of the catalyst 5.
  • the calculation values represent the NO x content in the exhaust gases flowing out of the catalyst 5.
  • the calculation means 21 is adapted to calculate the magnitude of the parameter by means of a suitable calculation model.
  • the calculation model may be designed in any desired manner and use any desired input parameters as long as it provides, with a desired accuracy, values of the expected magnitude of the parameter at the outlet of the catalyst 5.
  • the arrangement 20 further comprises processing means 22 arranged to receive information from the sensor 1 1 as to the measured magnitude of the parameter and information from the cal- culation means 21 as to the calculated magnitude of the parameter.
  • the processing means 22 is adapted: a) to establish a first curve C1 based on the information from the sensor as to the measured magnitude of the parameter during a certain period of time T ev , which is here denominated evaluation period, this first curve C1 representing the measured magnitude of the parameter as a function of time during the evaluation period T ev , b) to establish a second curve C2 based on the information from the calculation means 21 as to the calculated magnitude of the parameter during the evaluation period T ev , this second curve C2 representing the calculated magnitude of the parameter as a function of time during the evaluation period T ev , c) to compare the second curve C2 with the first curve C1 in order to establish whether or not the curve shape of the second curve C2 resembles the curve shape of the first curve C1 , and d) if it
  • the evaluation period T ev may in the given example for instance be in the order of 10-30 seconds. During this period of time, measuring values and calculation values as to the magnitude of the parameter are established repeatedly, for instance with an interval in the order of 10-100 ms.
  • the length of the evaluation period T ev and the interval between each measuring value and calculation value, respectively, may of course vary widely from case to case depending on the nature of the exhaust gas after- treatment system to be monitored.
  • the processing means 22 is adapted to compare the second curve C2 with the first curve C1 by means of a suitable curve comparison model or curve recognition model.
  • the model may be designed in any suitable manner and may for instance be based on statistical methods, taking into account the covariance etc, or on mathematical methods involving the comparison of derivatives and/or absolute values.
  • the model is with advantage designed to compare the gradient of the second curve C2 at certain points of time during the evaluation period T ev with the gradient of the first curve C1 at the corresponding points of time so as to thereby establish whether or not the curve shape of the second curve C2 resembles the curve shape of the first curve C1 .
  • the processing means 22 is suitably adapted to evaluate measuring values from the sensor 1 1 and corresponding calculation values from the calculation means 21 as to the magnitude of the parameter during the evaluation period T ev in order to form a correspondence value V c representing the correspondence, such as for instance the difference, ratio or correlation, between said measuring values and calculation values during the evaluation period. Information regarding the functioning of the exhaust gas aftertreatment system 2 is then generated based on this correspondence value V c .
  • the correspondence value V c is compared directly with a given threshold value in order to establish whether or not the exhaust gas aftertreatment system 2 can be considered to function properly.
  • the processing means 22 is adapted to generate information regarding the functioning of the exhaust gas aftertreatment system 2 by comparing the correspondence value V c with a lookup value V
  • the processing means 22 is suitably adapted to generate a fault indica- tion if the difference or ratio between the correspondence value V c and the lookup value V
  • a suitable threshold value may be established empirically by practical tests and/or theoretically on the basis of suitable calculations.
  • the processing means 22 is with advantage adapted to form the correspondence value V c in such a manner that it represents the correspondence between the mean value of said measuring val- ues from the sensor 1 1 and the mean value of said calculation values from the calculation means 21 during the evaluation period T ev or during a part thereof.
  • the correspondence value V c is suitably formed so as to represent the difference between the mean value of said measuring values and the mean value of said calculation values.
  • a maximum allowed upper limit for the correspondence value V c may be set. In this case, a fault indication is suitably generated if a correspondence value V c exceeding this upper limit is formed.
  • the processing means 22 is adapted to receive information as to the operating conditions of the engine 1 , such as for instance information as to the load and rotational speed of the engine.
  • the processing means 22 is with advantage adapted to generate information regarding the functioning of the exhaust gas after- treatment system 2 based on measuring values from the sensor 1 1 and corresponding calculation values from the calculation means 21 as to the magnitude of the parameter during the evaluation period T ev , only on condition that it is established that the engine 1 of the vehicle is running under steady-state operating conditions during the evaluation period T ev .
  • the information as to the operating conditions of the engine 1 is also used in order to establish the engine operating point prevailing during the evaluation period T 6 ev
  • the processing means 22 may be adapted to establishing lookup values V iu of the above-mentioned type, i.e. lookup values to be compared with later correspondence values V c in order to generate information regarding the functioning of the exhaust gas af- tertreatment system 2.
  • the processing means 22 is adapted to execute the above-mentioned steps a)-c) in a situa- tion when it is established that the engine 1 of the vehicle is running under steady-state operating conditions at a certain engine operating point.
  • step c) If it is established by the comparison in step c) that the curve shape of the second curve C2 resembles the curve shape of the first curve C1 , the processing means 22 is then adapted to generate a lookup value V iu for the engine operating point in question based on the information from the sensor 1 1 and the corresponding information from the calculation means 21 as to the magnitude of the parameter during the evaluation period T ev -
  • the processing means 22 may be adapted to generate an initial lookup value V iu for a certain engine operating point based on an initial correspondence value V c of the above-mentioned type established for the engine operating point in question or based on the mean value of several consecutive correspondence values established at different occasions for the engine operating point in question.
  • U are established for several different engine operating points when the vehicle is rather new and its exhaust gas aftertreatment system 2 can be considered to function properly.
  • the processing means 22 is with advantage adapted to update the respective lookup value V
  • the processing means 22 is suitably adapted to apply some kind of weighting for such subsequent correspondence values V c so that each such subsequent correspondence value is made to affect the magnitude of the corresponding lookup value V
  • Each such subsequent correspondence value V c is of course also compared with the corresponding lookup value V
  • a maximum allowed upper limit for the respective lookup value V iu may be set. In this case, a fault indication is suitably generated if a lookup value V
  • the arrangement 20 suitably comprises some sort of indicating device for displaying an error message and/or emitting an acoustic or luminous warning signal when a fault of the monitored system has been detected.
  • An abnormal correspondence value V c indicates that the catalyst 5 and/or any other component of the exhaust gas aftertreatment system 2, such as for instance the injection device 6 or the sensor 1 1 , is not functioning satis- fyingly, and may for instance be due to one or more of the following causes:
  • the injection device 6 does not inject the expected amount of the expected reducing agent
  • the possible fault causes should be checked when a fault indication has been generated in order to find and correct the fault in question.
  • the calculation means 21 and the processing means 22 are with advantage included in one and the same computer unit, e.g. in the form of an electronic control unit of a motor vehicle, but may also be arranged in separate and mutually communicating computer units.
  • FIG. 1 A flow diagram illustrating an embodiment of an inventive method for monitoring the functioning of an exhaust gas aftertreatment system of a motor vehicle is shown in Fig 3.
  • a first curve C1 representing the measured magnitude of a parameter as a function of time during an evaluation period T ev is established based on measuring values from a sensor.
  • a second curve C2 representing the calculated magnitude of the parameter as a function of time during the evaluation period T ev is established based on values of the magnitude of the parameter calculated by means of a calculation model.
  • the second curve C2 is compared with the first curve C1 in order to establish whether or not the curve shape of the second curve C2 resembles the curve shape of the first curve C1 .
  • step S3 If the comparison in step S3 shows that the curve shape of the second curve C2 resembles the curve shape of the first curve C1 , information regarding the functioning of the ex- haust gas aftertreatment system is generated in a fourth step S4 based on measuring values from the sensor and corresponding calculation values from the calculation model as to the magnitude of the parameter during the evaluation period T ev -
  • the monitoring cycle is terminated in step S5.
  • the above-mentioned steps S1 -S3 may of course be carried out simultaneously in real time.
  • FIG. 1 A flow diagram illustrating an embodiment of an inventive method for establishing lookup values to be used for monitoring the functioning of an exhaust gas aftertreatment system of a motor vehi- cle is shown in Fig 4.
  • a first step S1 ' it is established whether the engine of the vehicle is running under steady-state operating conditions at a certain engine operating point. If this is the case, steps S2'-S4' corresponding to the above-mentioned steps S1 -S3 are executed.
  • step S4' If the comparison in step S4' shows that the curve shape of the second curve C2 resembles the curve shape of the first curve C1 , a lookup value V
  • the above-mentioned steps S2'-S4' may of course be carried out simultaneously in real time.
  • step S1 of Fig 3 is preceded by a step corresponding to step S1 ' of Fig 4 and step S4 of Fig 3 is followed by a step corresponding to step S5' of Fig 4.
  • Computer program code for implementing a method according to the invention is suitably included in a computer program, which is loadable into the internal memory of a computer, such as the internal memory of an electronic control unit of a motor vehicle comprising an exhaust gas aftertreatment system to be monitored.
  • a computer program is suitably provided via a com- puter program product comprising a data storage medium readable by an electronic control unit, which data storage medium has the computer program stored thereon.
  • Said data storage medium is for instance an optical data storage medium in the form of a CD-ROM disc, a DVD disc etc, a magnetic data storage me- dium in the form of a hard disc, a diskette, a cassette tape etc, or a memory of the type ROM, PROM, EPROM or EEPROM or a Flash memory.
  • An inventive computer program comprises computer program code for causing a computer: a) to receive information from a sensor as to the magnitude of a parameter related to exhaust gases flowing out of an exhaust gas aftertreatment appliance included in an exhaust gas aftertreatment system of a motor vehicle, and establish a first curve C1 based on said information, this first curve C1 representing the measured magnitude of the parameter as a function of time during an evaluation period T ev ; b) to calculate, on the basis of a calculation model, values representing the magnitude of the parameter or receive information about said values calculated on the basis of a calculation model, and establish a second curve C2 based on the calculated values of the magnitude of the parameter during the evaluation period T ev , this second curve C2 representing the calculated magnitude of the parameter as a function of time during the evaluation period T ev ; c) to compare the second curve C2 with the first curve C1 in or- der to establish whether or not the curve shape of the second curve C2 resembles the curve shape of the first curve C1 ; and d
  • steps a)-c) may of course be carried out simultaneously in real time.
  • An inventive computer program comprises computer program code for causing a computer to execute the following in a situation when it is established that the engine of the vehicle is running under steady-state operating conditions at a certain engine operating point: a) to receive information from a sensor as to the magnitude of a parameter related to exhaust gases flowing out of an exhaust gas aftertreatment appliance included in an exhaust gas aftertreatment system of a motor vehicle, and establish a first curve C1 based on said information, this first curve C1 representing the measured magnitude of the parameter as a function of time during an evaluation period T ev ; b) to calculate, on the basis of a calculation model, values representing the magnitude of the parameter or receive information about said values calculated on the basis of a calculation model, and establish a second curve C2 based on the calculated values of the magnitude of the parameter during the evaluation period T ev , this second curve C2 representing the calculated magnitude of the parameter as a function of time during the evaluation period T ev ; c) to compare the second curve C2 with the first curve C1 in order
  • U for the engine operating point in question to be used for monitoring the functioning of the exhaust gas aftertreatment system
  • the lookup value being generated based on measuring values from the sensor and corre- sponding calculation values from the calculation model as to the magnitude of the parameter during the evaluation period T ev .
  • steps a)-c) may of course be carried out simultaneously in real time.
  • Fig 2 very schematically illustrates an electronic control unit 30 comprising an execution means 31 , such as a central processing unit (CPU), for executing computer software.
  • the execution means 31 communicates with a memory 33, for instance of the type RAM, via a data bus 32.
  • the control unit 30 also comprises data storage medium 34, for instance in the form of a memory of the type ROM, PROM, EPROM or EEPROM or a Flash memory.
  • the execution means 31 communicates with the data storage medium 34 via the data bus 32.
  • a computer program comprising computer program code for implementing a method according to the invention is stored on the data storage medium 34.

Landscapes

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

Abstract

L'invention concerne un procédé et un dispositif de surveillance du fonctionnement d'un système de post-traitement des gaz d'échappement (2) d'un véhicule motorisé, caractérisé en ce que : une première courbe est établie sur la base de valeurs de mesure provenant d'un capteur (11) se rapportant à la grandeur d'un paramètre lié à des gaz d'échappement s'écoulant d'un appareil de post-traitement de gaz d'échappement (5) pendant une période d'évaluation; une seconde courbe est établie sur la base des valeurs de la grandeur du paramètre pendant la période d'évaluation calculées au moyen d'un modèle de calcul; on établit si oui ou non la forme de courbe de la seconde courbe ressemble à celle de la première courbe; et l'on génère des informations concernant le fonctionnement du système de post-traitement de gaz d'échappement sur la base des valeurs de mesure provenant du capteur et des valeurs de calcul correspondantes provenant du modèle de calcul pendant la période d'évaluation, seulement si la forme de courbe de la seconde courbe ressemble à celle de la première courbe.
PCT/SE2008/050048 2007-01-19 2008-01-16 Procédé et dispositif de surveillance du fonctionnement d'un système de post-traitement des gaz d'échappement Ceased WO2008088285A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112008000223.1T DE112008000223B4 (de) 2007-01-19 2008-01-16 Verfahren und Anordnung zum Überwachen der Funktionsfähigkeit eines Abgasnachbehandlungssystems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0700111A SE530674C2 (sv) 2007-01-19 2007-01-19 Förfarande och inrättning för övervakning av funktionen hos ett avgasefterbehandlingssystem
SE0700111-8 2007-01-19

Publications (1)

Publication Number Publication Date
WO2008088285A1 true WO2008088285A1 (fr) 2008-07-24

Family

ID=39636207

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050048 Ceased WO2008088285A1 (fr) 2007-01-19 2008-01-16 Procédé et dispositif de surveillance du fonctionnement d'un système de post-traitement des gaz d'échappement

Country Status (3)

Country Link
DE (1) DE112008000223B4 (fr)
SE (1) SE530674C2 (fr)
WO (1) WO2008088285A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113272533A (zh) * 2019-01-11 2021-08-17 罗伯特·博世有限公司 用于确定废气后处理系统的老化行为的方法和装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014209810B4 (de) 2014-05-22 2024-10-02 Robert Bosch Gmbh Verfahren und Vorrichtung zur Erkennung einer Ruß- und Aschebeladung eines Partikelfilters
DE102015014931B4 (de) * 2015-11-18 2021-01-07 Audi Ag Verfahren zum Überwachen eines Zustands einer Vorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4122787A1 (de) * 1990-07-23 1992-01-30 Volkswagen Ag Einrichtung zur ueberwachung des konvertierungsgrads eines katalysators
EP0756071A2 (fr) * 1995-07-25 1997-01-29 Toyota Jidosha Kabushiki Kaisha Dispositif pour déterminer le degré anomal de détérioration d'un catalyseur
US5860277A (en) * 1994-07-22 1999-01-19 Robert Bosch Gmbh Method for monitoring the operating capability of a catalyzer in the exhaust duct of an internal combustion engine
WO2004109072A1 (fr) * 2003-06-10 2004-12-16 Scania Cv Ab (Publ) Procede et dispositif de surveillance de catalyseur
US20060089783A1 (en) * 2002-06-27 2006-04-27 Daimlerchrysler Ag Method for monitoring an exhaust gas system of a motor vehicle
US20060096278A1 (en) * 2004-09-25 2006-05-11 Hartmut Lueders Method for operating an internal combustion engine and a device for carrying out the method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10153769B4 (de) * 2000-12-08 2004-08-05 Ford Global Technologies, LLC (n.d.Ges.d. Staates Delaware), Dearborn Verfahren und Einrichtung zur Überwachung des Schädigungsgrades eines Katalysators
JP4325367B2 (ja) * 2003-11-10 2009-09-02 株式会社デンソー 排気温度センサの故障検出装置
DE10358195A1 (de) * 2003-12-12 2005-07-14 Robert Bosch Gmbh Verfahren zur Überwachung eines in einem Abgasbereich einer Brennkraftmaschine angeordneten Bauteils

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4122787A1 (de) * 1990-07-23 1992-01-30 Volkswagen Ag Einrichtung zur ueberwachung des konvertierungsgrads eines katalysators
US5860277A (en) * 1994-07-22 1999-01-19 Robert Bosch Gmbh Method for monitoring the operating capability of a catalyzer in the exhaust duct of an internal combustion engine
EP0756071A2 (fr) * 1995-07-25 1997-01-29 Toyota Jidosha Kabushiki Kaisha Dispositif pour déterminer le degré anomal de détérioration d'un catalyseur
US20060089783A1 (en) * 2002-06-27 2006-04-27 Daimlerchrysler Ag Method for monitoring an exhaust gas system of a motor vehicle
WO2004109072A1 (fr) * 2003-06-10 2004-12-16 Scania Cv Ab (Publ) Procede et dispositif de surveillance de catalyseur
US20060096278A1 (en) * 2004-09-25 2006-05-11 Hartmut Lueders Method for operating an internal combustion engine and a device for carrying out the method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113272533A (zh) * 2019-01-11 2021-08-17 罗伯特·博世有限公司 用于确定废气后处理系统的老化行为的方法和装置
CN113272533B (zh) * 2019-01-11 2023-04-07 罗伯特·博世有限公司 用于确定废气后处理系统的老化行为的方法和装置

Also Published As

Publication number Publication date
SE530674C2 (sv) 2008-08-05
DE112008000223B4 (de) 2018-04-05
SE0700111L (sv) 2008-07-20
DE112008000223T5 (de) 2009-12-24

Similar Documents

Publication Publication Date Title
US7680587B2 (en) Method and an arrangement for monitoring the functioning of a sensor or an exhaust gas aftertreatment system
US8573043B2 (en) Method for monitoring an SCR catalytic converter
US8478565B2 (en) Method of monitoring soot mass in a particulate filter and monitoring system for same with correction for active regeneration inefficiency
US8930121B2 (en) Offset and slow response diagnostic methods for NOx sensors in vehicle exhaust treatment applications
CN104791119B (zh) 评估NOx传感器响应速率劣化的设备、系统和方法
US9416715B2 (en) Method for monitoring an exhaust system of an internal combustion engine
US20210095590A1 (en) Method of monitoring an scr catalyst
US7318341B2 (en) Method and device for monitoring a signal
US20070033925A1 (en) Monitoring of exhaust gas limiting values
CN108374712B (zh) 用于借助于氨逸出在scr系统中进行故障识别的方法
US20130213236A1 (en) Failure detecting apparatus for particulate filter
CN102817684B (zh) 用于排气系统NOx传感器的过滤器的诊断方法和诊断模块
US10100701B2 (en) Method for the diagnosis of an exhaust gas aftertreatment system for an internal combustion engine
US7930876B2 (en) Method and device for monitoring a particle filter in the exhaust line of an internal combustion engine
CN108374711A (zh) 用于借助于氨逸出在scr系统中进行故障识别的方法
WO2008088285A1 (fr) Procédé et dispositif de surveillance du fonctionnement d'un système de post-traitement des gaz d'échappement
CN112983613B (zh) 一种氮氧传感器故障判断方法及相关装置
WO2008048175A1 (fr) Procédé et agencement destinés à surveiller le fonctionnement d'un système de post-traitement des gaz d'échappement
CN111927607B (zh) 监控用于减少氮氧化物的催化净化器的状态
US10584624B2 (en) Method and arrangement for correcting for error of particulate matter sensors
US12146431B2 (en) Non-intrusive reductant injector clogging detection
US11448568B2 (en) Method of determining the evaluation time for a diagnosis
CN114592955B (zh) 确定scr载体硫中毒的方法、设备、系统及存储介质
CN115217599A (zh) 用于诊断用于内燃机的scr系统的方法和设备
US20240044275A1 (en) Verfahren zur diagnose eines partikelfilters für einen verbrennungsmotor

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08705320

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 1120080002231

Country of ref document: DE

RET De translation (de og part 6b)

Ref document number: 112008000223

Country of ref document: DE

Date of ref document: 20091224

Kind code of ref document: P

122 Ep: pct application non-entry in european phase

Ref document number: 08705320

Country of ref document: EP

Kind code of ref document: A1