EP3717757A1 - Verfahren zum betreiben einer abgasnachbehandlungsanlage einer brennkraftmaschine und abgasnachbehandlungsanlage - Google Patents
Verfahren zum betreiben einer abgasnachbehandlungsanlage einer brennkraftmaschine und abgasnachbehandlungsanlageInfo
- Publication number
- EP3717757A1 EP3717757A1 EP18808321.6A EP18808321A EP3717757A1 EP 3717757 A1 EP3717757 A1 EP 3717757A1 EP 18808321 A EP18808321 A EP 18808321A EP 3717757 A1 EP3717757 A1 EP 3717757A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- concentration
- exhaust gas
- particulate filter
- scr
- scr particulate
- 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.)
- Granted
Links
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
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- 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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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- 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
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
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- 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
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- 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
- F01N2550/04—Filtering activity of particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
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- 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
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- 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
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1406—Exhaust gas pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1602—Temperature of exhaust gas apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1616—NH3-slip from catalyst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1622—Catalyst reducing agent absorption capacity or consumption amount
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1812—Flow rate
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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- 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
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D2041/1468—Introducing 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 ammonia content or concentration of the exhaust gases
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- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0055—Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus
Definitions
- the present invention relates to a method for operating an exhaust aftertreatment system of an internal combustion engine, in particular a diesel engine, which arranged in an exhaust pipe combined SCR particulate filter and a device for targeted, defined changing the NH 3 - and / or NO c concentration in the exhaust gas mass flow upstream before the SCR particulate filter.
- the present invention is therefore based on the object to provide a method and a corresponding exhaust aftertreatment system of an internal combustion engine, which allow a particularly rapid and accurate monitoring of an SCR particulate filter with respect to its NOx / Nfh conversion and the particle filtering during operation of the internal combustion engine.
- a method for operating an exhaust gas aftertreatment system of an internal combustion engine wherein the exhaust aftertreatment system an exhaust pipe for Leading an exhaust gas mass flow and arranged in the exhaust pipe SCR particulate filter and having a A direction for targeted, defined changing the NH 3 - and / or NO c concentration in the exhaust gas mass flow upstream of the SCR particulate filter, and at least a first concentration sensor, in the exhaust gas mass flow downstream after the
- SCR particulate filter is arranged.
- the method according to the invention has the following steps:
- the internal combustion engine is set to a mode Diagnosebe, with certain relevant diagnose se operating parameters of the internal combustion engine to be verified accordance with diagnostic default values, set or adjusted.
- a specific, defined induction of an NH 3 concentration change and / or a change in NO x in the exhaust gas mass flow takes place upstream of the SCR particulate filter with respect to the values of the NH 3 concentration and NO present in the diagnostic mode x concentration.
- the SCR particle filter is diagnosed as defective if the evaluation shows that the concentration comparison value has exceeded at least one predefined limit value.
- the invention further relates to an exhaust aftertreatment system of an internal combustion engine having a arranged in an exhaust pipe SCR particulate filter and at least one device for specific, defined changing the NH 3 - and / or
- NO c concentration in the exhaust gas mass flow upstream of the SCR particulate filter and at least one concentration sensor, for measuring the NH 3 and / or NO x concentration in the Abgasmas senstrom downstream of the SCR particulate filter.
- This exhaust aftertreatment system is characterized in that it has an electronic computing and control unit which is set up for targeted, defined changing of the NH 3 and / or NO x concentration in the exhaust gas mass flow upstream of the SCR particulate filter by means of the device aimed at, Defined changing the NH 3 and / or NO x -Konzentra- tion and for detecting a of the at least one con centration sensor outputted first concentration measurement signal.
- the electronic computing and control unit is further configured to perform the method for operating an exhaust aftertreatment system of an internal combustion engine according to one of the above and below described embodiment of the method according to the invention.
- the basic idea of the invention is to use a NO x and / or Nfh sensor after an SCR particulate filter, in conjunction with a NH 3 concentration change and / or an NO x concentration Change in the exhaust gas mass flow upstream of the SCR particulate filter to subject the SCR particulate filter to a functional check, in particular a performance diagnosis.
- a wall-flow filter with suitable SCR coating is used as the SCR particle filter.
- Functionally impairing damage to SCR particulate filters usually consists of openings or holes in the substrate of the filter whose number or cross-sectional area determine the degree of damage and through which a corresponding part of the exhaust gas can pass unfiltered and untreated. If the total cross-section of the apertures or open holes is above a threshold, the corresponding particle emission exceeds a diagnostic threshold (OBD threshold).
- OBD threshold diagnostic threshold
- the addition amount of the urea solution and / or the NO c raw emission preferably increased in one step, for example by 200 ppm NH3 / NO X, starting from the previously given NH3 addition amount or NO c -remission , and the NO x and / or NH 3 signal course is observed (measurement of the corresponding concentration increase).
- the SCR particle filter is now within the emission limit, it can be assumed that the entire cross section of openings in the filter substrate is so small that the added urea or the increased NO x concentration is initially stored for the most part in the SCR particle filter. Therefore, the NO x or NH 3 signal measured after the filter has a short duration of, for example, 3 sec
- SCR particulate filter is directly proportional to the total cross section of the apertures in the filter substrate of the SCR particulate filter. If this ratio is above a certain threshold or limit, the filter is considered defective in terms of particle conversion.
- the SCR particulate filter for example, by reducing the exhaust gas recirculation rate (EGR rate), especially in a high-pressure exhaust gas recirculation, but also at a low-pressure exhaust gas recirculation, performed.
- EGR rate exhaust gas recirculation rate
- the NO x concentration change after the SCR particle filter in relation to the NO x concentration change before the SCR particle filter is directly proportional to the total cross section of the openings in the filter substrate of the SCR particle filter.
- concentration measurement signals a concentration comparison value determined.
- this concentration comparison value can represent, for example, the maximum deflection of the concentration measurement signal within the specified time window.
- the concentration comparison value may also be a ratio between the NH 3 and / or NO x concentration change before and after the SCR particulate filter.
- the concentration comparison value can be determined on the basis of a plurality of successive changes in concentration, and the respective gradients of the concentration changes can also be used, as will be explained below. It can be understood by the change in concentration, both a concentration increase and a reduction in concentration or both consecutively.
- the named concentration sensor depending on whether the NH 3 or NO x concentration is changed to carry out the method, is a Nfh sensor or a NO x sensor. While a Nfh sensor is only suitable for measuring the NH 3 concentration, with the mentioned NO x sensor, on the other hand, both the NH 3 and the NO x concentration, and consequently also a combination of NO x and NH 3, can be measured , In this case, this is a combined NH 3 / NCK concentration sensor. Depending on the desired measurement, therefore, the appropriate sensors can be provided.
- the present invention further relates to a Abgasnachbe treatment plant of an internal combustion engine, in particular a diesel engine, which is arranged in an exhaust pipe SCR particulate filter and at least one device for targeted, defined changing the NH 3 and / or NO x concentration in the exhaust gas mass flow upstream of the SCR Particle filter, and at least a first concentration sensor, for measuring the NH 3 - and / or NO c concentration in the exhaust gas mass flow downstream of the SCR particulate filter.
- this exhaust aftertreatment system is characterized by the fact that it has a elekt ronic computing and control unit, which is set up for targeted, defined changing the NH 3 - and / or NO c concentration in the exhaust gas mass flow upstream of the
- the electronic computing and control unit is further adapted to carry out the method for operating an exhaust aftertreatment system of an internal combustion engine, as shown in the foregoing and the embodiments described below.
- Figure 1 is a schematic representation of an embodiment of an exhaust aftertreatment system according to the invention.
- Figure 2 is a block diagram illustrating the
- FIG. 3 shows a qualitative representation of trajectories of the NOx / Nfh concentration before and after the SCR particle filter with intact and defective SCR particle filter
- Figure 4 is a qualitative representation of trajectories of NOx / Nfh concentration before and after the SCR particulate filter with successive NOx / Nfh concentration changes. Function and naming equals objects are marked in the figures throughout with the same reference numerals.
- FIG. 1 shows schematically in a simplified representation an embodiment of an exhaust aftertreatment system according to the invention of an internal combustion engine, for example a diesel engine.
- the exhaust gas mass flow 10 coming from the internal combustion engine (not shown here) is guided in the direction of the arrow through an exhaust gas line 1 and passes through an SCR particulate filter 3 (SC-PF) which is designed, for example, as a wall-flow filter with an SCR coating and in the exhaust gas line 1 is arranged.
- SC-PF SCR particulate filter 3
- an NH 3 supply device 7 for supplying an NH 3 solution 7 d into the exhaust gas line is located upstream of the SCR particulate filter 3 on the exhaust gas line 1 1, arranged.
- the NH3 supply device 7 has in this embodiment, a reservoir 7a, for storing a suitable aqueous NH3 solution 7d, which is also characterized as urea solution be.
- a metering device 7b for example, an injection valve, in conjunction, which in turn is arranged on the exhaust pipe 1 and adapted to deliver defined amounts of NH3 solution in the exhaust gas mass flow 10.
- the added NH3 solution produces NH3, which converts the NO c content in the exhaust gas into nitrogen and water.
- the SCR particulate filter therefore fulfills its function as a diesel particulate filter and at the same time reduces the NO x content in the exhaust gas.
- Part exhaust gas mass flow 10 a of the given from the engine exhaust gas mass flow 10 via a first exhaust gas recirculation line 2 a is returned to the intake of the internal combustion engine.
- Part exhaust gas mass flow 10a can be adjusted via a arranged in the first exhaust gas recirculation line 2a first exhaust gas recirculation valve 2b.
- the branch of this exhaust gas recirculation device 2 is arranged on the exhaust pipe 1 upstream of the NH3 supply means 7, since the supplied NH3 solution 7d is to be completely supplied to the SCR particulate filter 3 for NO c reduction.
- the size of the recirculated further partial exhaust gas mass flow 10b can be adjusted via a further exhaust gas recirculation valve 8b arranged in the further exhaust gas recirculation line 8a.
- This first concentration sensor 6 outputs a corresponding first concentration measurement signal 110, on the basis of which a correlating concentration comparison value (VgW) can be provided.
- This additional concentration sensor 5 also outputs a corresponding second concentration measurement signal 100, which can be used to provide a concentration comparison value (VgW).
- an actually measured value for the Nfh concentration change and / or the NO x concentration change in the exhaust gas mass flow 10 upstream of the SCR particle filter 3, for example for the provision of a concentration comparison value (VgW), can be used to carry out the method. which increases the safety of the diagnosis of the SCR particulate filter. Otherwise, if only the downstream of the SCR particulate filter 3 arranged Konzentrati onssensor 6 is available, for example, the default value for the targeted, defined concentration change is assumed as the actual value, it being assumed that the device for targeted, defined changing the respective concentration value works without errors.
- ECU electronic cal calculation and control unit 15
- This is directed to the specific, defined changing of the NH 3 and / or NO x concentration in the exhaust gas mass flow 10 upstream of the SCR particle filter 3, by means of at least one of the above-mentioned devices for specific, defined altering of the NH 3 and / or NO x concentration and for detecting a, from the at least one concentration sensor 6 output first concentration measurement signal (110) and in a further expansion stage a second concentration measuring signal.
- the elekt ronic computing and control unit 15 via signal lines 2c, 5c, 6c, 7c and 8c with the system components first exhaust gas recirculation valve 2b, additional concentration sensor 5, first concentration sensor 6, metering device 7b and further exhaust gas recirculation valve 8b electrically connected to control signals to the corresponding System components to give or receive signals, in particular measurement signals from the corresponding Systemkompo components.
- the electronic computing and control unit 15 is further adapted to the inventive method for operating an exhaust aftertreatment system of an internal combustion engine according to one of the embodiments of the invention based on a first concentration measurement signal of the first concentration sensor 6 or based on the two concentration measurement signals of the first and the additional concentration sensor 6, 5th perform.
- An embodiment of the exhaust aftertreatment system is characterized in that the electronic computing and control unit 15 is an integral part of a central control unit (CPU) 16 of the internal combustion engine, wherein the method to be executed part of an on-board diagnostic system for monitoring the exhaust-related functional units of the internal combustion engine in normal operation.
- An embodiment of the method according to the invention for operating an exhaust aftertreatment system of an internal combustion engine in one of the previously described embodiments is illustrated by the simplified block sequence program shown in FIG. 2 in the essential method steps.
- D-BP_set After the start of the process, in the first process step labeled "D-BP_set", the internal combustion engine is set to a diagnostic mode, with certain relevant diagnostic operating parameters (D-BP) of the internal combustion engine being in accordance with diagnostic default values
- the diagnostic mode is characterized by at least one of the following diagnostic operating parameters:
- the engine speed (RPM) of the internal combustion engine is adjusted to a value between 1100 and 1900 revolutions / minute.
- T-SC-PF operating temperature
- a pressure difference of the exhaust gas mass flow (AP_SCR-PF) via the SCR particle filter 3 between 3 bar and 7 bar is verified.
- an Nfh storage amount (SM_SC-PF) in the SCR particulate filter 3 is above a predefined threshold value.
- the Nfh addition amount may be adjusted to a stoichiometric value with respect to the NO c concentration in the exhaust gas upstream of the SCR particulate filter, that is, the Nfh addition amount corresponds to an amount sufficient to fully react the NO x share in the exhaust gas in
- SCR particulate filter is required.
- the specification of these loading operating parameters ensures stable operation of the internal combustion engine, reduces interference on the process and thus increases the reliability of the validity of the diagnosis of the SCR particle filter.
- the corresponding diagnostic default values are stored in an electronic memory of the electronic computing and STEU erritt (ECU), which is marked in Figure 2 with "E_Spl", and can be read and used to perform this method step in a simple manner.
- D-BP D-BP_set
- a NH3 concentration change or a change in NO x concentration or a combined or superimposed NO x / NH 3 concentration change brought about by means of a corresponding control of said Means for specific, defined induction of the NH 3 and / or NO x concentration change, by the electronic computing and control unit (ECU) 15.
- ECU electronic computing and control unit
- the defined NO c concentration change before the SCR particulate filter 3 in an increase or a reduction of the NO x concentration consist which is achieved for example by a defined reduction or increase in an exhaust gas recirculation rate, here under supporting even further operating parameters of the internal combustion engine can be influenced in terms of increasing the NO x concentration in the exhaust gas.
- the exhaust gas recirculation rate by means of the first exhaust gas recirculation device 2 or the further exhaust gas recirculation device 8 or the two from gas recirculation means 2, 8 in combination can be set.
- the defined NH 3 concentration change upstream of the SCR particle filter 3 can consist of a defined increase or reduction of the NH 3 concentration, which can be achieved by a defined increase or reduction in the amount of NH 3 solution 7 d added by means of the NH 3 feed device 7, is set. This is done in particular by ent speaking control of the metering device 7 b by means of the electronic computing and control unit (ECU) 15th
- the NH 3 and / or NO x concentration change in the exhaust gas mass flow 10 after the SCR particulate filter 3 is now within a, in accordance with the method step marked "NO x / NH 3 _Sig". measured indirectly on the aforementioned NH 3 and / or NO x concentration change in front of the SCR particle filter 3 following the specified time window (TW).
- TW specified time window
- the method is in the context of the aforementioned method step in the same time window (TW) to additionally the NH 3 - and / or NO x - change in concentration upstream, measured upstream of the SCR particulate filter.
- TW time window
- an additional concentration sensor 5 which is in the Abgasmas senstrom 10 upstream of the SCR particulate filter 3 is assigned to the NH 3 - and / or NO x -Konzentrations selectedung in the exhaust gas mass flow 10 before the SCR particulate filter 3 corre lating second concentration measurement signal 120 and supplied via a signal line 5 c of the electronic computing and control unit ECU.
- VgW correlating Kon concentration comparison value
- the concentration comparison value (VgW) can be determined within the defined range Time window determined NH 3 and / or NO x -concentration changes after and before the SCR particulate filter 3 based.
- the values of the NH 3 and / or NO x concentration changes determined within the defined time window at a specific time and / or the gradients of these concentration changes, in each case before and after the SCR particle filter 3 are compared or set in relation to each other. This makes it possible to provide a particularly reliable concentration comparison value (VgW) and increases the diagnostic reliability of the method, since misdiagnosis due to possibly defective devices for NH 3 and / or NO x concentration change can be excluded.
- step marked "VgW-GW” the evaluation of the NH 3 and / or NO x concentration change measured within the defined time window TW takes place after the SCR particle filter (3) on the basis of the respective concentration
- a respective maximum value or minimum value of the change in concentration and / or a determined gradient of the change in concentration or else comparative values can be used as the concentration comparison value. or behavior values based on the values or gradients of the concentrations respectively measured before and after the SCR particle filter 3. ration change. This allows a wide variance in the design of the method according to the invention and the adaptation to the needs of the particular application. In accordance with the concentration comparison value used, adjusted accordingly
- Specify limit values These can be determined, for example, empirically beforehand or by means of model calculation and are stored, for example, in an electronic memory area of the electronic computing and control unit and retrieved therefrom for evaluation of the concentration change.
- Such an electronic memory area is identified in FIG. 2 by E_Sp2 and contains the corresponding limit values, which are represented as "(NO x / NH 3 ) _GW".
- the inventive method can be repeated in certain cycles during operation, these cycles can be based on a certain operating time period, a specific operating performance or on ermit demanded in operation.
- a further embodiment of the method is characterized in that, as part of the NH 3 and / or NO x concentration change, there is first an increase in concentration and an immediately following reduction in concentration.
- the concentration reduction takes place to such a selected value and for such a selected second period of time, so that an average over the duration of Konzentrati onserhöhung and the concentration reduction resulting average of NH 3 - and / or NO x concentration downstream of the SCR particulate filter, which speaks before the concentration increase prevailing value of NH 3 and / or NO x concentration ent. In this way it is ensured that over the duration of the procedure, in terms of time, there is no increase in pollutant emissions caused by the process.
- a further embodiment of the method is characterized in that a combined concentration sensor 6 is used for measuring the NH 3 and / or NO x concentration change in the exhaust gas mass flow 10, which changes the NH 3 and / or NO x concentration in one combined concentration measurement signal 110 summarized.
- This may apply both to the first concentration sensor 6, downstream of the SCR particulate filter 3, and to the second concentration sensor 5, upstream of the SCR particulate filter 3.
- This makes it possible to specify in an advantageous manner for carrying out the method both an NH 3 concentration change and a NO x concentration change as well as a combined NH 3 / NO x concentration change and thus also opens up a greater scope for the extent of predetermined concentration change.
- the respective specified time window (TW) for measuring the NH 3 - and / or NO x - change in concentration in the exhaust gas mass flow 10 after and / or before the SCR particulate filter 3 a duration of less than or equal to 5 seconds, in particular less than or equal to 3 seconds.
- the length of this time window ensures that only a rapid NH 3 and / or NO x concentration change after the
- SCR particulate filter 3 as it occurs only in case of a defect of the SCR particulate filter 3, in the determination of the Kon concentration comparison value and so in the diagnosis of SCR particulate filter effect.
- FIG. 3 shows an example of the courses of the
- the curve 100 shows the NO x - / NH 3 concentration upstream of the SCR particulate filter, starting from a regulated in the diagnostic mode NO x - / NH 3 concentration at about 40 ppm at the time TI a defined Konzentrati ons capableung by approx. lOOppm to 140 ppm is brought about.
- the trajectory 110 shows the downstream of the SCR particulate captured NO x - / NH3 concentration with a defective
- NO x - / NH 3 concentration increases with a gradient G1 within the time window TW and increases up to a maximum concentration KM1 at the time T2, at the end of the time window TW.
- Trajectory 120 shows the NO x / NH 3 concentration taken downstream of the SCR particulate filter in an intact SCR particulate filter.
- the NO x - / NH 3 concentration begins to increase within the time window TW, but with a comparison with the curve 110 substantially smaller gradient G2. Accordingly, until the time T2, at the end of the time window TW, only a much smaller Maxi malkonzentration KM2 achieved.
- concentration comparison value VgW can, as can be seen from the aforementioned embodiments, each depending to a certain time within the
- Time window TW or at the end of the time window TW reached maximum concentration MK1, MK2 or the respective gradient Gl, G2 of the NO x - / NH3 concentration increase within the time window TW are used. Furthermore, it is possible to view the concentration values ascertained downstream of the SCR particle filter and the concentration values preset or determined upstream in combination and to determine a comparison value therefrom.
- the NO x - / NH 3 concentration values upstream of the SCR particulate filter can be based on the default values, determined with the aid of model considerations or measured by means of a concentration sensor (if present).
- a concentration comparison value VgW in one embodiment the gradient of the concentration increase, determined within the time window TW, downstream of the SCR particle filter can be divided by the jump value of the concentration change upstream of the SCR particle filter. The result is used as the concentration comparison value VgW. For example, if the gradient of the concentration increase downstream of the SCR particulate filter is 11.3 ppm / sec and the skip value of the concentration change upstream of the SCR particulate filter is 480ppm (paying attention to the signs), a concentration comparison value of:
- a further embodiment of the method is characterized in that the NH 3 and / or NO x concentration change has an increase in concentration and an immediately following concentration reduction, and the values and or the gradients of the concentration increase and the concentration reduction respectively after and before the SCR Particle filter 3 in combination with each other for the evaluation of the measured NH 3 - and / or NO x - change in concentration after the SCR particulate filter 3 are used.
- a respective ratio value of the gradient of the concentration increase downstream and the jump value of the concentration increase upstream of the SCR particle filter and of the gradient of the subsequent concentration drop downstream and the associated jump value of the concentration reduction upstream of the SCR particle filter can be formed and their sum calculated become.
- the Ver run curve 100 shows a targeted and defined induced sudden increase in concentration + KSpl by a certain amount, at the time TI and a persistence of increased
- the concentration comparison value VgW can be determined by the following relationship:
- a gradient of +7.3 ppm / s downstream results in a +780 ppm upstream lift of the SCR particulate filter followed by a gradient of -11.3 ppm / s downstream with a -480 ppm reduction in concentration / s the concentration comparison value is calculated as follows:
- the targeted, defined NH 3 and / or NO x concentration change in the exhaust gas mass flow 10 upstream of the SCR particulate filter 3 is withdrawn, the diagnostic mode is terminated and the NH 3 - and or NO c concentration is again set or regulated depending on the current operating point of the internal combustion engine.
- the internal combustion engine can continue to operate in the normal working operating mode after carrying out the method, ie after the diagnosis of the functionality of the SCR particulate filter 3 this is in the process step labeled "BP_Norm".
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Abstract
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DE102018215627.1A DE102018215627A1 (de) | 2017-11-29 | 2018-09-13 | Verfahren zum Betreiben einer Abgasnachbehandlungsanlage einer Brennkraftmaschine und Abgasnachbehandlungsanlage |
PCT/EP2018/082357 WO2019105859A1 (de) | 2017-11-29 | 2018-11-23 | Verfahren zum betreiben einer abgasnachbehandlungsanlage einer brennkraftmaschine und abgasnachbehandlungsanlage |
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DE102019207757B4 (de) * | 2019-05-27 | 2021-10-14 | Vitesco Technologies GmbH | Verfahren zum Betreiben einer Abgasnachbehandlungsanlage einer Brennkraftmaschine und Abgasnachbehandlungsanlage |
DE102020202551A1 (de) | 2020-02-28 | 2021-09-02 | Vitesco Technologies GmbH | Verfahren und Vorrichtung zur Diagnose eines in einem Abgaskanal eines Kraftfahrzeugs angeordneten beschichteten Partikelfilters |
US12017506B2 (en) | 2020-08-20 | 2024-06-25 | Denso International America, Inc. | Passenger cabin air control systems and methods |
US11760170B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Olfaction sensor preservation systems and methods |
US11813926B2 (en) | 2020-08-20 | 2023-11-14 | Denso International America, Inc. | Binding agent and olfaction sensor |
US11932080B2 (en) | 2020-08-20 | 2024-03-19 | Denso International America, Inc. | Diagnostic and recirculation control systems and methods |
US11760169B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Particulate control systems and methods for olfaction sensors |
US11881093B2 (en) | 2020-08-20 | 2024-01-23 | Denso International America, Inc. | Systems and methods for identifying smoking in vehicles |
US11828210B2 (en) | 2020-08-20 | 2023-11-28 | Denso International America, Inc. | Diagnostic systems and methods of vehicles using olfaction |
US11636870B2 (en) | 2020-08-20 | 2023-04-25 | Denso International America, Inc. | Smoking cessation systems and methods |
DE102020211731B4 (de) | 2020-09-18 | 2022-08-18 | Vitesco Technologies GmbH | Verfahren und Vorrichtung zur Diagnose eines beschichteten Ottopartikelfilters eines Abgastrakts einer Brennkraftmaschine |
CN113513419B (zh) * | 2021-03-29 | 2022-10-14 | 广西玉柴机器股份有限公司 | 一种调整发动机后处理热处理系统的方法及发动机控制器 |
CN113340605B (zh) * | 2021-04-29 | 2023-01-24 | 广西玉柴机器股份有限公司 | 一种拖拉机整车累碳试验方法及系统 |
CN113279849B (zh) * | 2021-07-05 | 2023-04-07 | 凯龙高科技股份有限公司 | 一种scr系统nh3泄露识别检测方法 |
KR102600606B1 (ko) * | 2021-10-19 | 2023-11-09 | 한화오션 주식회사 | 선박의 연료공급시스템 및 방법 |
DE102021212868A1 (de) * | 2021-11-16 | 2023-05-17 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren zum Ermitteln einer Abgaszusammensetzung eines Abgases einer Brennkraftmaschine |
WO2024116089A1 (en) * | 2022-12-01 | 2024-06-06 | Stellantis Europe S.P.A. | A method for detecting malfunctions of a particulate trap installed in an exhaust after-treatment system of a motor vehicle |
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CN100587235C (zh) * | 2005-09-29 | 2010-02-03 | 沃尔沃拉斯特瓦格纳公司 | 用于排气后处理系统的诊断方法 |
JP2009156159A (ja) | 2007-12-26 | 2009-07-16 | Toyota Motor Corp | 排気ガス浄化システムの異常部位の判定装置 |
FR2956987B1 (fr) | 2010-03-02 | 2012-03-23 | Peugeot Citroen Automobiles Sa | Procede de detection du fonctionnement defaillant d'un filtre a particules d'un systeme anti-pollution |
DE102010029740B4 (de) * | 2010-06-07 | 2022-05-12 | Robert Bosch Gmbh | Verfahren zur Überwachung eines SCR-Katalysators |
US8800274B2 (en) * | 2011-05-12 | 2014-08-12 | GM Global Technology Operations LLC | Method for managing ammonia slip |
DE102012201749B4 (de) * | 2012-02-07 | 2024-02-15 | Robert Bosch Gmbh | Verfahren zur Überwachung eines SCR-Katalysators |
CN104220710B (zh) * | 2012-03-29 | 2017-11-14 | 沃尔沃建筑设备公司 | 诊断选择性催化还原催化剂的方法 |
DE102012105952A1 (de) * | 2012-07-04 | 2014-01-09 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Verfahren zur Zugabe eines Reduktionsmittels in eine Abgasbehandlungsvorrichtung |
DE102012220151A1 (de) | 2012-11-06 | 2014-05-22 | Robert Bosch Gmbh | Verfahren zur Überprüfung eines Ammoniaksensors oder eines NH3-querempfindlichen Sensors |
DE102013200623A1 (de) | 2013-01-17 | 2014-07-17 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Überwachung eines Partikelfilters |
DE102013006153A1 (de) * | 2013-04-10 | 2014-10-30 | Daimler Ag | Verfahren zum Betreiben einer Abgasreinigungsanlage eines Kraftfahrzeug-Verbrennungsmotors |
US9879580B2 (en) * | 2015-08-19 | 2018-01-30 | Cummins, Inc. | Diagnostic methods for a high efficiency exhaust aftertreatment system |
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US11346267B2 (en) | 2022-05-31 |
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