WO2019206559A1 - Post-traitement des gaz d'échappement au moyen d'un catalyseur accumulateur et d'un filtre à particules - Google Patents

Post-traitement des gaz d'échappement au moyen d'un catalyseur accumulateur et d'un filtre à particules Download PDF

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Publication number
WO2019206559A1
WO2019206559A1 PCT/EP2019/057987 EP2019057987W WO2019206559A1 WO 2019206559 A1 WO2019206559 A1 WO 2019206559A1 EP 2019057987 W EP2019057987 W EP 2019057987W WO 2019206559 A1 WO2019206559 A1 WO 2019206559A1
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WO
WIPO (PCT)
Prior art keywords
exhaust system
catalytic converter
mixture
particulate filter
storage capacity
Prior art date
Application number
PCT/EP2019/057987
Other languages
German (de)
English (en)
Inventor
Peter Mueller
Stephan Ramatschi
Frederik John
Hannes Orlick
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Bayerische Motoren Werke Aktiengesellschaft
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Application filed by Bayerische Motoren Werke Aktiengesellschaft filed Critical Bayerische Motoren Werke Aktiengesellschaft
Publication of WO2019206559A1 publication Critical patent/WO2019206559A1/fr

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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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • 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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • 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
    • F01N3/101—Three-way catalysts
    • 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
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/03—Monitoring or diagnosing the deterioration of exhaust systems of sorbing activity of adsorbents or absorbents
    • 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
    • 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
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1402—Exhaust gas composition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1606—Particle filter loading or soot amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1614—NOx amount trapped in catalyst
    • 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 invention relates to a control means for the aftertreatment of exhaust gases of an internal combustion engine Ver in an exhaust system and a vehicle drive with an internal combustion engine, an exhaust system and such a control means. Furthermore, the invention relates to a method for the aftertreatment of the exhaust gases of a driving.
  • Modern exhaust systems include a three-way catalytic converter (TWC), and typically also a nitrogen oxide storage catalytic converter (NSK) or a particulate filter (DPF for diesel vehicles or OPF for gasoline vehicles).
  • TWC three-way catalytic converter
  • NNK nitrogen oxide storage catalytic converter
  • DPF particulate filter
  • a combination of three-way catalyst and gasoline particulate filter is often used when pursuing a lambda 1 concept, while the three-way catalyst is often installed in combination with a nitrogen oxide storage catalyst when lean operation is provided.
  • exhaust systems with a nitrogen oxide storage catalytic converter and a particle filter in vehicles are now also partially installed.
  • a control means for the aftertreatment of exhaust gases of an internal combustion engine in an exhaust system comprising a mixture adjuster for matching a combustion mixture, in particular for matching a fuel supply and / or an air supply of the internal combustion engine.
  • the mixture plate is a control component that can control a fuel valve and / or a charge air valve of the internal combustion engine, for example steplessly.
  • the control means is in particular adapted to detect and process measured values of at least one lambda probe in the exhaust gas stream, and is arranged in particular in front of a three-way catalytic converter of the exhaust gas system.
  • control means is set up in particular to determine a remaining storage capacity of a storage catalytic converter of the exhaust system, in particular based on measured values of an NO x sensor and / or by reading from an operating model, and the combustion mixture, in particular the fuel supply and / or or adjust the air supply of the combustion mixture, by means of the mixture actuator based on the detected lambda value and on the basis of the determined storage capacity.
  • the control means is also configured to determine a remaining filter capability of a particulate filter of the exhaust system, in particular based on measured values of a back pressure sensor and / or by reading from an operating system. model, and the combustion mixture, in particular a fuel content and / o of an air content of the combustion mixture, based on the detected lambda value and on the basis of the determined filter capability to adjust.
  • a vehicle drive comprising an internal combustion engine for providing a propulsion torque with a, in particular controllable, air supply and a, in particular attiba Ren, fuel supply, and an exhaust system for the aftertreatment of exhaust gases of the internal combustion engine with a three-way catalyst Storage catalytic converter, a particulate filter and a arranged in the exhaust stream before the catalysts lambda probe has.
  • the vehicle drive also has a control means according to an embodiment of the invention.
  • a method for aftertreatment of the exhaust gases of a vehicle drive wherein the vehicle drive is designed in particular according to an embodiment of the invention.
  • the method has at least the following method steps, wherein the individual nen steps according to the order given, but possibly also in another, useful in the individual case sense sequence can be performed: i) determining a remaining storage capacity of a storage catalytic converter of an exhaust system of the vehicle drive, in particular by means of a NO x sensor and / or by resorting to an operating model. ii) lowering a fuel portion of a combustion mixture with which a combustion engine of the vehicle drive is operated when the determined storable storability is greater than a storage limit, in particular by means of the blender.
  • the lowering of the fuel fraction for example, by lowering the injected fuel quantity (possibly at constant charge air quantity) and / or by Increase the charge air quantity (if necessary with the same quantity of fuel injected).
  • the storage limit value can be dimensioned, for example, such that a lean-burn operation is only triggered if it is "worthwhile" taking into account further operating parameters of the vehicle drive and / or if regeneration of the storage capacity of the storage catalytic converter is to be expected soon expected load conditions of the internal combustion engine is possible before the storage capacity of the nitrogen oxide Speicherkata lysators is exhausted due to the lean operation.
  • a lambda value is determined in the exhaust gas flow, and, in particular only then, the fuel fraction is lowered if the determined lambda value is richer than a predetermined lean-burn lambda value.
  • the lean-burn lambda value can be matched, for example, to the internal combustion engine used in such a way that an optimum compromise between consumption advantage and relevant emission values is achieved during operation of the internal combustion engine during the lean-burn lambda value.
  • the invention is based inter alia on the consideration that in a driving tool drive whose exhaust system has a three-way catalyst, a particulate filter and a nitrogen oxide storage catalytic converter can be minimized by a suitable operating strategy, the exhaust emissions at the tailpipe for quite different occurring Be operating events.
  • the three-way catalytic converter can catalytically convert the largest proportion of the pollutant emissions due to the stoichiometric composition of the combustor mixture without generating an undesirable excess of nitrogen oxides and / or soot particles.
  • a rich combustion mixture (lambda is less than 1) is burned, the resulting undesirable excess of Rußpar particles can be included in the particulate filter.
  • the nitrogen oxide storage catalyst can be regenerated during the combustion of a rich combustion mixture. The carbon oxide and hydrocarbon residues from the fat combustion are then used to take up the oxygen of the stored nitrogen oxides and thus reduce them.
  • the nitrogen oxide storage catalytic converter must have sufficient storage capacity to buffer the NOx excess resulting from the lean operation.
  • the regeneration of the particulate filter can be carried out neutral with respect to the NOx emissions at the tailpipe.
  • the regeneration of the nitrogen oxide storage catalytic converter in the case of a rich combustion mixture, sufficient filterability of the particulate filter is required in order to absorb the soot surplus resulting from the rich operation.
  • the regeneration of the nitrogen oxide storage catalyst can be carried out neutral with respect to the soot and / or hydrocarbon emissions at the tailpipe.
  • it is intended to detect in addition to the storage capacity of the nitrogen oxide storage catalyst and the filter capability of the particulate filter in appro priate manner.
  • the vehicle drive by means of the control means can be operated so that a temporary lean operation is possible if and as long as the remaining storage capacity of the storage catalyst is sufficient to keep the exhaust after-treatment emission neutral at the tailpipe.
  • the vehicle drive has a suitable particle filter heater so that regeneration of the particulate filter can be carried out if its filter capability has reached or fallen below a filter limit value.
  • the invention aims to integrate existing mixture deviations as well as in this operating strategy as well as the targeted achievement of Gemischab deviations.
  • a targeted rich mixture can also be set, for example for diagnostic functions and / or for the regeneration of the nitrogen oxide storage catalytic converter.
  • the control means In order to allow in typical vehicle concepts a simple and / or low-adaption He the storage capacity of the storage catalytic converter and / or the filterability of the particulate filter, the control means according to an embodiment on at least one operating model, from whose database is removable: a) a remaining storage capacity of the storage catalytic converter as a function of it, operating states of the internal combustion engine and / or the exhaust system, and / or b) a remaining filter capability of the particulate filter as a function of detected operating states of the internal combustion engine and / or the exhaust system.
  • the mixture plate is adapted to adapt a fuel supply and / or an air supply of the internal combustion engine.
  • the storage capability can additionally or alternatively also be determined by resorting to a suitable operating model.
  • the exhaust system has a back pressure sensor for detecting a pressure drop across the particulate filter.
  • the filter capability can additionally or alternatively also be determined by recourse to a suitable operating model.
  • the vehicle drive can be operated within the meaning of the invention without a NO x breakthrough to the tailpipe, according to an embodiment of the combus- tion engine at most as long as operated at the lean-burn lambda value until the determined storage capacity has reached the storage limit.
  • the following method steps are carried out according to one embodiment: a) determining a remaining filter capability of a particulate filter of the exhaust system; b) Increasing a fuel fraction of the combustion mixture if the determined storage capacity is less than or equal to the storage limit value and the determined filter capability of the particulate filter is greater than a filter limit value.
  • the setting of such a rich combustion mixture can be associated in particular with the performance of diagnostic functionalities.
  • methods according to an embodiment of the invention are performed only if a propulsion request and / or other constraints for allow the internal combustion engine from the operation of the vehicle drive and / or the vehicle a lean combustion mixture.
  • FIG. 1 is a schematic representation of a vehicle drive with a combus- tion engine, an exhaust system and a control means according to an exemplary embodiment of the invention.
  • FIG. 2 is a schematic diagram for illustrating a method according to an exemplary embodiment of the invention using the vehicle drive according to FIG. 1.
  • FIG. 1 shows a vehicle drive 1 which has an internal combustion engine 2 for providing a propulsion torque with a controllable air supply 4 and a controllable fuel supply 6.
  • an internal combustion engine 2 for providing a propulsion torque with a controllable air supply 4 and a controllable fuel supply 6.
  • a controllable air supply 4 for providing a propulsion torque with a controllable air supply 4 and a controllable fuel supply 6.
  • a fuel injection 5 is arranged at each Zy cylinder 3, wherein at each Zy cylinder 3, a fuel injection 5 is arranged.
  • a different number of cylinders may be provided.
  • the invention is of course also for example with a diesel engine (in particular with an unregulated air supply) as a vehicle drive in the sense of a correspondingly embodied exemplary embodiment of the invention usable.
  • the vehicle drive 1 also has an exhaust system 8 for the aftertreatment of exhaust gases 10 of the internal combustion engine 2.
  • the exhaust system 8 comprises a three-way catalytic converter 12, a storage catalytic converter 14 designed as a nitrogen oxide storage catalytic converter, a particle filter 16 designed as a gasoline particulate filter, and a lambda probe 18 arranged in the exhaust gas stream upstream of the catalytic converters 12, 14.
  • the exhaust system 8 has, downstream of the storage catalytic converter 14, an NO x sensor 20 for detecting nitrogen oxide measured values.
  • the exhaust system 2 has a back pressure sensor 22 for detecting a pressure drop across the particulate filter 16.
  • the vehicle drive 1 also has a control means 24 for aftertreatment of the exhaust gases of the internal combustion engine 2 in the exhaust system 8.
  • the control means 24 has a mixture actuator 26 for adapting a combustion mixture (see reference numeral 28 in FIG.
  • the mixture plate 26 is directed to fit the fuel supply 6 and / or the air supply 4 of the internal combustion engine 2 with respect to a present during combustion lambda value XG.
  • the control means 24 is adapted to detect and process measured values 1 of the lambda probe 18 in the exhaust gas flow upstream of the 3-way catalytic converter 12 of the exhaust system 8.
  • the control means 24 is set up to determine a remaining storage capacity ⁇ s of the storage catalytic converter 14 of the exhaust system 8, in particular based on measured values of the NO x sensor 20 and / or by reading from an operating model 30 stored in a database 32 of the control means 24.
  • the control means 24 can adapt the fuel supply 6 and / or the air supply 4 and thus the combustion mixture 28, in particular with regard to its lambda value XG during combustion.
  • the adaptation takes place on the basis of the storage capacity E s determined by means of the NO x sensor 20 and / or the operating model 30 and on the basis of the detected lambda value l.
  • the control means 24 is adapted to determine a remaining filterability F F of the particulate filter 16 of the exhaust system 8, in particular based on measured values of the back pressure sensor 22 and / or by reading from the Radiomo model 30.
  • the control means 24, the combustion mixture 28 based on the he took Lambda value and based on the determined filter ability [F adapt.
  • the operating model 30 is in the exemplary embodiment in particular constructed so that its database 32 both the remaining storage capacity £ s of the storage catalyst 14 and the remaining filter capability £ F of the particulate filter 16, depending Weil detected operating conditions of the engine 2 and / or the exhaust system 8 can be removed. Possibly. can also be considered operating conditions of the vehicle in the operating model 30.
  • FIG. 2 shows a diagram in which a pie chart 40 is shown.
  • the passing time t is indicated along the rotation about the center of the pie chart.
  • the illustration of the diagram 40 is intended to represent a recurring cycle with the round, closed embodiment, which can result from carrying out the exemplary method.
  • the pie chart 40 is on the outer ring 42 of the coupler 26 by means of the Gemischstel 26 at a particular time by means of the lambda probe 18 measured lambda value l.
  • the development of the storage capacity ⁇ s of the nitrogen oxide storage catalytic converter 14 is shown on the middle ring 44.
  • the development of the filterability] TF of the particulate filter 16 is shown at the respective time.
  • the remaining storage capacity _s and the remaining filterability XF remain substantially constant.
  • the remaining storage capacity _s of the storage catalytic converter 14 is determined by detecting a value for the nitrogen oxide load in the gas flow from the storage catalytic converter 14 by means of the NO x sensor 14. From this detected value, the remaining storage capacity ⁇ s of the storage analyzer 14 is determined by means of a comparison with stored values in the operating model 30.
  • the fuel supply 6 can be reduced, in particular by means of a fuel valve 34 (alternatively or additionally, the air supply 4 can also be started up, in particular by means of a charge air valve 36).
  • the vehicle drive 1 is thus operated in the lean lambda range (l> 1).
  • l the lean lambda range
  • a nitrogen oxide excess arises in the exhaust gases, which gradually charges the storage catalytic converter 14 with NO x molecules, so that the remaining storage capacity [s] continuously drops.
  • the particulate filter 16 may be regenerated to increase its remaining filter capability, £ F.
  • the acid excess of lean combustion is used.
  • a certain minimum temperature is required so that the hydrocarbons in the soot particles burn together with the oxygen, in particular pyrolytic table.
  • an additional particulate filter heater can be provided in the embodiment, or the time offset for the use of cata- capacitor exotherm in the heating of the particulate filter 16 is accepted.
  • the distribution of the vehicle drive 1 with lean combustion mixture 28 leads to fuel ratio beats.
  • the lean operation can be maintained who until the storage capacity Xs has reached the storage limit ⁇ so that further lean operation (at least soon) would result in increased NO x emissions at the tailpipe because no further nitrogen oxides are buffered in the storage catalyst 14 can.
  • this situation is reached at time t 2 .
  • the control means 24 As soon as the control means 24 has determined the insufficient remaining storage capacity _s, it regulates the lambda value to XG ⁇ 1 by means of the mixture controller 26 and sets up therewith a rich combustion mixture.
  • the storage catalyst 14 may be regenerated with the excess of carbon oxides and / or hydrocarbons in the combustion exhaust gases, so that the remaining storage capacity ⁇ s increases and over time increases again above the storage limit ⁇ .
  • the particulate filter 16 ensures in the rich operation that the excess of
  • Soot particles do not get into the environment, but get caught in the particle filter. However, this can only be done by the particle filter 16 if the remaining filter capability XF at the time t 2 is greater than a filter limit value F F O. Therefore, a pressure drop on the particulate filter 16 is first measured by means of the back pressure sensor 22 before switching the rich operation. In the operating model 30, the measured pressure drop is brought into contact with a corresponding remaining filter capability _F. A rich operation is switched in the embodiment only if the remaining filter capability F F is greater than the filter limit>> o.
  • the rich operation is usually switched only briefly; in the illustration until time t 3 .
  • this operating state ends when reaches the filter limit value XF O , because then the soot particle filtering stops working. In the normal case, however, a few seconds between t 2 and h are sufficient to regenerate the SpeI cherkatalysator 14 to a sufficient extent.
  • the alternating regeneration of the storage catalytic converter 14 and of the particulate filter 16 can take place via longer periods of time during operation of the internal combustion engine 2, a fuel-saving lean burn mixture can be used without any undesirable amount of nitrogen oxides or soot particles escaping into the environment at any given time.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

L'invention concerne un entraînement de véhicule (1) et un moyen de commande (24) pour réaliser le post-traitement de gaz d'échappement (10) d'un moteur à combustion interne (2) dans un système d'échappement (8), le moyen de commande (24) comprenant un régulateur de mélange (26) destiné à adapter un mélange de combustion (28). Au cours d'un procédé, des valeurs de mesure d'au moins une sonde lambda (18) sont détectées dans le flux de gaz d'échappement avant un catalyseur à trois voies (12) du système d'échappement (8) et traitées, et une capacité de stockage restante d'un catalyseur accumulateur de NOx (14) et d'un filtre à particules (16) est déterminée, le mélange de combustion (28) étant alors adapté au moyen du régulateur de mélange (26) en fonction de la valeur lambda détectée, de la capacité de stockage de NOx restante déterminée et de la capacité de filtrage restante déterminée.
PCT/EP2019/057987 2018-04-27 2019-03-29 Post-traitement des gaz d'échappement au moyen d'un catalyseur accumulateur et d'un filtre à particules WO2019206559A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018206559.4A DE102018206559B4 (de) 2018-04-27 2018-04-27 Abgasnachbehandlung mit Speicherkatalysator und Partikelfilter
DE102018206559.4 2018-04-27

Publications (1)

Publication Number Publication Date
WO2019206559A1 true WO2019206559A1 (fr) 2019-10-31

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WO (1) WO2019206559A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001061162A1 (fr) * 2000-02-17 2001-08-23 Volkswagen Aktiengesellschaft Dispositif et procede pour determiner la necessite de regeneration d'un catalyseur accumulateur de no¿x?
DE102013003701A1 (de) * 2013-03-04 2014-09-04 Volkswagen Aktiengesellschaft Verfahren zur Steuerung einer Regeneration eines Partikelfilters sowie einer zur Ausführung des Verfahrens ausgebildete Abgasanlage
EP3115566A1 (fr) * 2015-07-09 2017-01-11 Volkswagen Aktiengesellschaft Dispositif et procede de post-traitement de gaz d'echappement d'un moteur a combustion interne

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015215365A1 (de) * 2015-08-12 2017-02-16 Volkswagen Ag Verfahren zur Regeneration von Abgasnachbehandlungskomponenten eines Verbrennungsmotors sowie Abgasnachbehandlungsvorrichtung für einen Verbrennungsmotor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001061162A1 (fr) * 2000-02-17 2001-08-23 Volkswagen Aktiengesellschaft Dispositif et procede pour determiner la necessite de regeneration d'un catalyseur accumulateur de no¿x?
DE102013003701A1 (de) * 2013-03-04 2014-09-04 Volkswagen Aktiengesellschaft Verfahren zur Steuerung einer Regeneration eines Partikelfilters sowie einer zur Ausführung des Verfahrens ausgebildete Abgasanlage
EP3115566A1 (fr) * 2015-07-09 2017-01-11 Volkswagen Aktiengesellschaft Dispositif et procede de post-traitement de gaz d'echappement d'un moteur a combustion interne

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DE102018206559A1 (de) 2019-10-31

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