WO2020109250A1 - Système d'épuration de gaz d'échappement et véhicule automobile - Google Patents

Système d'épuration de gaz d'échappement et véhicule automobile Download PDF

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Publication number
WO2020109250A1
WO2020109250A1 PCT/EP2019/082463 EP2019082463W WO2020109250A1 WO 2020109250 A1 WO2020109250 A1 WO 2020109250A1 EP 2019082463 W EP2019082463 W EP 2019082463W WO 2020109250 A1 WO2020109250 A1 WO 2020109250A1
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WO
WIPO (PCT)
Prior art keywords
nitrogen oxide
exhaust gas
motor vehicle
information
downstream
Prior art date
Application number
PCT/EP2019/082463
Other languages
German (de)
English (en)
Inventor
Hong Zhang
Original Assignee
Vitesco Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vitesco Technologies GmbH filed Critical Vitesco Technologies GmbH
Publication of WO2020109250A1 publication Critical patent/WO2020109250A1/fr

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Classifications

    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • 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
    • 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
    • F01N3/0828—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
    • 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
    • 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
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • F02D41/146—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 NOx content or concentration
    • F02D41/1463—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 NOx content or concentration of the exhaust gases downstream of 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an emission control system for a motor vehicle, which has a nitrogen oxide storage.
  • the present invention further relates to a motor vehicle which has such an exhaust gas purification arrangement which is operatively connected to an internal combustion engine of the motor vehicle.
  • the object of the invention is to provide an exhaust gas purification arrangement and a motor vehicle which are improved compared to the prior art.
  • better knowledge of the exhaust gas composition is to be made possible or operation of the exhaust gas purification arrangement should also be made more efficient.
  • the object of the invention is achieved by an exhaust gas cleaning arrangement of the type mentioned at the outset, which is aimed to obtain information about an exhaust gas composition of the exhaust gas downstream of the nitrogen oxide storage.
  • the exhaust gas purification arrangement is designed to control the operation of the nitrogen oxide store as a function of the information, in particular to control and diagnose the nitrogen oxide store. So instead of or in addition to a temperature, the exhaust gas composition can be used for control, which can be more reliable or simpler.
  • taxes is not necessarily to be understood only narrowly as the metrological term. Regulations can also be understood as taxes in the present case. Rather, the term control can generally be understood as the adaptation of the operation, in particular an activity, of the nitrogen oxide storage, taking into account the information obtained.
  • the activity of the nitrogen oxide storage can be a nitrogen oxide intake amount per time interval and / or a nitrogen oxide release amount per time interval.
  • the nitrogen oxide store is preferably designed with a multi-way catalyst function, in particular a three-way catalyst function.
  • the nitrogen oxide storage is then preferably designed as a combined nitrogen oxide storage three-way catalyst.
  • the nitrogen oxide store can not only store nitrogen oxide, but can also serve as a returnable catalyst.
  • the exhaust gas purification arrangement is arranged to determine a nitrogen oxide concentration in the exhaust gas downstream of the nitrogen oxide store as the information and to control the nitrogen oxide store with regard to its operation depending on the determined nitrogen oxide concentration.
  • the information is particularly preferably determined as a measure of the activity of the nitrogen oxide storage.
  • the exhaust gas makes it easy to draw a conclusion about the activity of the nitrogen oxide storage. If the nitrogen oxide intake quantity of the nitrogen oxide storage per time interval is high, a comparatively low nitrogen oxide concentration will be determined and vice versa. Accordingly, the operation of the nitrogen oxide store can be controlled, that is, high operation can be provided for a high nitrogen oxide concentration and low operation can be provided for a low nitrogen oxide concentration. This can save costs and energy.
  • the control of the nitrogen oxide store is preferably proportional to the nitrogen oxide concentration.
  • the exhaust gas purification arrangement has a sensor downstream of the nitrogen oxide storage device which receives the information.
  • the exhaust gas purification arrangement as the sensor has a nitrogen oxide sensor downstream of the nitrogen oxide storage, which determines a nitrogen oxide measurement result as the information.
  • the nitrogen oxide measurement result is in a row preferably a nitrogen oxide concentration in the exhaust gas.
  • the nitrogen oxide measurement result is preferably used in order to control the operation of the nitrogen oxide reservoir as a function of the specific nitrogen oxide concentration. If the nitrogen oxide sensor provides the nitrogen oxide measurement result, the activity of the nitrogen oxide storage does not have to be ascertained in a complicated manner directly on the basis of its performance data, which are unknown in vehicle operation due to aging, but can simply be determined in particular via the nitrogen oxide concentration in the exhaust gas.
  • the sensor in particular the nitrogen oxide sensor, is preferably set up to continuously determine the information, in particular the nitrogen oxide measurement result. This enables permanent, uninterrupted control of the exhaust gas downstream of the nitrogen oxide store.
  • the sensor is set up to determine the information at predetermined intervals, in particular with interruptions, preferably at a fixed interval of several seconds .
  • the senor in particular the nitrogen oxide sensor, is arranged in the exhaust gas path after the nitrogen oxide storage device, which is integrated with a reusable catalytic converter, or is arranged after the nitrogen oxide storage device and a reusable catalytic converter, which is provided separately downstream.
  • the nitrogen oxide measurement result in particular the nitrogen oxide concentration, and lambda to be determined.
  • Both catalysts can be optimally controlled with just one nitrogen oxide sensor.
  • the sensor in particular the nitrogen oxide sensor, is preferably arranged in the exhaust gas path between the nitrogen oxide store and a multi-way catalytic converter. This allows the nitrogen oxide measurement result, especially that Determine nitrogen oxide concentration before the exhaust gas reaches the multi-way catalytic converter. This enables efficient control of the nitrogen oxide storage.
  • the nitrogen oxide sensor is arranged downstream of the reusable catalytic converter, in particular arranged at an outlet of the exhaust gas cleaning arrangement. Then the operation of the nitrogen oxide storage can be readjusted depending on the nitrogen oxide concentration of the exhaust gas released into the environment.
  • Some embodiments provide a first nitrogen oxide sensor, which is located upstream of the multi-way catalyst, and a second nitrogen oxide sensor, which is located downstream of the multi-way catalyst.
  • a nitrogen oxide removal rate of the exhaust gas aftertreatment device can be monitored particularly reliably because two nitrogen oxide sensors are present which can measure the nitrogen oxide concentration at different points along the exhaust gas path.
  • the sensor in particular the nitrogen oxide sensor, is located immediately downstream of the nitrogen oxide reservoir. In this way, changes in the exhaust gas composition can be detected particularly promptly, which can be attributed in particular to the nitrogen oxide store.
  • the exhaust gas purification arrangement has a housing which encloses the exhaust gas path.
  • the housing preferably radially encloses the exhaust gas path.
  • the housing preferably provides an essentially cylindrical exhaust gas tunnel for the exhaust gas path.
  • the nitrogen oxide storage device, the nitrogen oxide sensor and preferably further elements such as the reusable catalytic converter can be arranged in the housing.
  • all components of the exhaust gas cleaning arrangement can be provided and enclosed in a single compact component.
  • the exhaust gas purification arrangement which has the housing, forms a motor vehicle catalytic converter assembly, which preferably has the outlet of the exhaust gas purification arrangement, which preferably can be connected to an end pipe of the motor vehicle.
  • a sensor housing of the sensor preferably penetrates the housing.
  • the sensor is arranged on an inner wall of the housing. So the sensor can be stably mounted on the housing.
  • the nitrogen oxide store is preferably set up to store nitrogen oxide from the exhaust gas up to a first temperature and to release it back to the exhaust gas from a second temperature which is higher than the first temperature.
  • the first temperature and the second temperature are preferably operating temperatures of the exhaust gas purification arrangement. This ensures reliable operation of the nitrogen oxide storage.
  • the nitrogen oxide store can be set up to release absorbed nitrogen oxide back into the exhaust gas by triggering an active regeneration.
  • the nitrogen oxide store preferably has a TWC property, where TWC stands for three-way catalyst.
  • the exhaust gas purification arrangement has an internal control unit which is programmed to control the nitrogen oxide store with regard to its operation in dependence on the information.
  • the exhaust gas cleaning arrangement can thus compactly control the operation without an external control unit.
  • the exhaust gas purification arrangement has a circuit which can be connected to an external control unit in order to lead a data line to the outside for outputting the information and preferably a control line for controlling the nitrogen oxide store.
  • the circuit for the control line and the data line can each have a control unit contact which can be connected to the external control unit in order to pass on the information from the sensor to the external control unit and to receive control signals for the nitrogen oxide store.
  • the object of the invention is further achieved by a motor vehicle of the type mentioned at the outset, the exhaust gas purification arrangement being set up to obtain information about an exhaust gas composition of the exhaust gas downstream of the nitrogen oxide store.
  • the motor vehicle is preferably set up to control the operation of the nitrogen oxide storage as a function of the information. If one preferably controls the operation in dependence on the information, one can ensure that the cleaning performance of the exhaust gas cleaning arrangement is adequate in order to purify the exhaust gas with sufficient nitrogen oxide. In this way, it can in particular be prevented that the exhaust gas purification arrangement, in particular because of the upstream nitrogen oxide store, does too little or too much cleaning work. In this way, the motor vehicle can become more efficient and can work more economically.
  • the motor vehicle is set up to adapt a combustion air ratio as a function of the information when a predetermined first threshold value information about the exhaust gas composition is obtained downstream of the nitrogen oxide storage, preferably after a cold start of the motor vehicle and during a catalyst heating phase.
  • the nitrogen oxide store has preferably exceeded a predetermined first nitrogen oxide threshold value, which is dependent on the air mass flow.
  • the sensor is preferably in particular the nitrogen oxide sensor is provided, which is located downstream of the nitrogen oxide reservoir in the exhaust gas path or integrated in the nitrogen oxide reservoir. It is preferred that the adaptation of the combustion air ratio comprises switching and regulating the combustion air ratio from> 1 to 1.
  • the nitrogen oxide and / or lambda signal from the nitrogen oxide measurement result of the sensor can be used for controlling the combustion air ratio, so that nitrogen oxide and NH 3 are minimized after the nitrogen oxide storage.
  • the predetermined first threshold value information is preferably a nitrogen oxide emission in the exhaust gas of more than 5 ppm, preferably more than 10 ppm.
  • the motor vehicle is set up to increase the heating of the nitrogen oxide reservoir as a function of the information if predetermined second threshold value information about the exhaust gas composition is obtained downstream of the nitrogen oxide reservoir, preferably after a cold start of the motor vehicle and during a catalyst heating phase, and the nitrogen oxide storage, in particular the multi-way catalyst integrated in the nitrogen oxide storage, or a downstream downstream multi-way catalyst falls below a predetermined threshold temperature.
  • the aim is then preferably to quickly heat the nitrogen oxide store, in particular the multi-way catalytic converter integrated in the nitrogen oxide store, or the downstream multi-way catalytic converter beyond the predetermined threshold temperature.
  • the heating can be achieved by increasing the ignition angle and / or by increasing the electrical power in the case of an electrically heated catalytic converter, which can be adjacent to the nitrogen oxide store.
  • the predetermined second threshold value information is preferably a nitrogen oxide emission in the exhaust gas of over 5 ppm, preferably over 10 ppm.
  • a preferred predetermined threshold temperature is 150 ° C., preferably below 200 ° C.
  • the first threshold value information and the second threshold value information are preferably the same.
  • the nitrogen oxide emission values are added up during the entire process from the cold start of the motor vehicle to after the desorption by the NO x adsorber, that is to say the nitrogen oxide store, particularly until preferably 3 to 8 seconds after, in particular up to 1 second after.
  • the motor vehicle can be set up to compare the total nitrogen oxide emission values with an emission threshold, which is preferably 100 mg and is dependent on a starting temperature of the internal combustion engine. If the sum of the nitrogen oxide emission values falls below the emission threshold, the motor vehicle can be set up to recognize the shortfall as an indication of a defective nitrogen oxide store. This means that maintenance measures can be requested quickly.
  • the motor vehicle preferably has a control unit which is programmed to carry out the above-mentioned steps if the motor vehicle is set up for these steps.
  • the control unit is preferably an external control unit.
  • the motor vehicle is preferably a hybrid vehicle.
  • Preferred hybrid vehicles include both an electric motor and the internal combustion engine, in particular a gasoline engine. Hybrid vehicles in particular can therefore benefit from the increased efficiency of the exhaust gas cleaning arrangement.
  • the motor vehicle can also be a conventional motor vehicle that is operated exclusively by an internal combustion engine. Further possible configurations and possible advantages of the motor vehicle result analogously to the statements above with regard to the exhaust gas cleaning arrangement.
  • Fig. 1 shows a schematic cross section through an embodiment of the exhaust gas purification arrangement according to the invention along an exhaust gas path and an external control unit.
  • Fig. 1 shows an exhaust gas purification arrangement 1 for a motor vehicle.
  • the exhaust gas purification arrangement 1 is installed in a hybrid vehicle, which for simplification is not further presented.
  • the hybrid vehicle has an electric motor, not shown, and an internal combustion engine, not shown, namely a gasoline engine.
  • the gasoline engine is connected to an inlet 2 of the exhaust gas cleaning arrangement 1 in order to provide exhaust gas for cleaning to the exhaust gas cleaning arrangement 1.
  • the exhaust gas purification arrangement 1 is therefore operatively connected to the internal combustion engine of the motor vehicle.
  • the exhaust gas cleaning arrangement 1 has a nitrogen oxide storage 3.
  • a three-way catalytic converter function is implemented in the nitrogen oxide store 3.
  • the exhaust gas cleaning arrangement 1 brings about a nitrogen oxide reduction in the exhaust gas.
  • the nitrogen oxide storage 3 is set up to nitrogen oxide from the exhaust gas up to a first temperature save and release it to the exhaust gas again at a second temperature that is higher than the first temperature.
  • the exhaust gas cleaning arrangement 1 is set up to receive information about an exhaust gas composition of the exhaust gas downstream of the nitrogen oxide store 3.
  • the exhaust gas purification arrangement 1 is further configured to control the operation of the nitrogen oxide storage 3 as a function of the information. This ensures that the exhaust gas cleaning arrangement 1 operates with an appropriate cleaning performance, taking into account an activity of the nitrogen oxide storage 3, for example a nitrogen oxide uptake from the exhaust gas or a nitrogen oxide emission into the exhaust gas.
  • the exhaust gas purification arrangement 1 has a nitrogen oxide sensor 4 as a sensor which determines a nitrogen oxide measurement result, namely the nitrogen oxide concentration, in the exhaust gas as the information.
  • the nitrogen oxide sensor 4 is set up to continuously determine the nitrogen oxide measurement result.
  • the nitrogen oxide measurement result is then used to control the nitrogen oxide storage 3 with respect to its operation depending on the nitrogen oxide concentration in the exhaust gas.
  • the nitrogen oxide sensor 4 is arranged in an exhaust gas path 5 between the nitrogen oxide storage 3, which in this exemplary embodiment also includes the three-way catalyst function, and an additional multi-way catalyst 6, which is a three-way catalyst 6 in the exemplary embodiment shown.
  • the additional three-way catalytic converter 6 is missing and the nitrogen oxide store 3 can take over its function completely with a multi-way catalytic converter integrated therein, in particular a three-way catalytic converter. Then the nitrogen oxide storage 3 is a combined nitrogen oxide storage three-way catalyst.
  • the nitrogen oxide storage 3 is a combined nitrogen oxide storage three-way catalyst.
  • the nitrogen oxide sensor 4 is immediately downstream of the nitrogen oxide reservoir 3 in the exhaust gas path 5.
  • the nitrogen oxide sensor 4 is also the three-way catalyst 6, which is provided in this embodiment in addition to the nitrogen oxide storage 3, upstream in the exhaust gas path 5.
  • the exhaust gas thus flows through the exhaust gas path 5 first through the inlet 2, then passes through the nitrogen oxide store 3, the nitrogen oxide store 3 taking nitrogen oxide from the exhaust gas or supplying it, depending on the operation of the nitrogen oxide store 3, then flows past the nitrogen oxide sensor 4 arranged downstream of the nitrogen oxide store 3 , then flows through the three-way catalytic converter 6 and then flows further to an outlet 7, from which the cleaned exhaust gas leaves the exhaust gas path 5 of the exhaust gas cleaning arrangement 1.
  • An external control unit 8 which analyzes the nitrogen oxide measurement result of the nitrogen oxide sensor 4 and then controls the operation of the nitrogen oxide store 3 as a function thereof, is also provided in the motor vehicle. External means external to the exhaust gas purification arrangement 1, but internal to the vehicle.
  • the external control unit 8 is set up to receive the nitrogen oxide measurement result from the nitrogen oxide sensor 4 and to control the nitrogen oxide storage 4 with regard to its operation as a function of the nitrogen oxide concentration of the exhaust gas.
  • the control unit 8 is connected to the nitrogen oxide sensor 4 and the nitrogen oxide store 3 via cables.
  • the exhaust gas cleaning arrangement 1 has a first control unit contact 9 in order to connect the nitrogen oxide storage 3 to the control unit 8.
  • the exhaust gas purification arrangement 1 has a second one Control unit contact 10 to connect the nitrogen oxide sensor 3 to the control unit 8.
  • the nitrogen oxide store 3 is set up in a controllable manner as a function of the information.
  • a housing 11 radially encloses the exhaust gas path 5 and provides an exhaust gas tunnel between the inlet 2 and the outlet 7.
  • the nitrogen oxide store 3, the nitrogen oxide sensor 4 and the three-way catalytic converter 6 are located in the exhaust gas tunnel.
  • the external control unit 8 is arranged separately from the exhaust gas path 5.
  • the control unit 8 is further programmed to adapt a combustion air ratio as a function of the information when a predetermined first threshold value information about the exhaust gas composition is obtained downstream of the nitrogen oxide store 3 and the nitrogen oxide store 3 has exceeded a predetermined first nitrogen oxide threshold value. The control unit 8 then switches the combustion air ratio from> 1 to 1.
  • control unit 8 is programmed to increase the heating of the nitrogen oxide storage 3 as a function of the information if a predetermined second threshold value information about the exhaust gas composition is obtained downstream of the nitrogen oxide storage 3 and the nitrogen oxide storage 3, in particular the three-way catalytic converter integrated in the nitrogen oxide storage, has a predetermined one Temperature falls below threshold.
  • the first threshold information and the second threshold information are both nitrogen oxide emissions of 10 ppm in the exhaust gas in this embodiment.
  • the predetermined threshold temperature in this exemplary embodiment is an operating temperature of 200 ° C.
  • the nitrogen oxide sensor 4 is set up to determine the first threshold value information and the second threshold value information.
  • the motor vehicle is set up to increase the heating of the nitrogen oxide storage 3 by retarding the ignition angle in the internal combustion engine. Furthermore, the motor vehicle is set up to further reduce nitrogen oxide emissions through engine measures, in particular exhaust gas recirculation, in order to greatly reduce a nitrogen oxide breakthrough towards the outlet 7.
  • control unit 8 is also programmed to recognize the nitrogen oxide storage 3 as faulty on the basis of the information, namely when nitrogen oxide emission values measured by the sensor 4 and added up by the control unit 8 fall below an emission threshold of 100 mg, for example.
  • the nitrogen oxide emission values are added up by the control unit 8 via the sensor 4 over a period from a cold start of the motor vehicle to 1 second after the desorption from the nitrogen oxide store 3.

Abstract

L'invention concerne un système d'épuration de gaz d'échappement (1) pour un véhicule automobile, comprenant un accumulateur d'oxydes d'azote (3). Ce système d'épuration des gaz d'échappement (1) est conçu pour obtenir des informations sur la composition de gaz d'échappement en aval de l'accumulateur d'oxydes d'azote (3). L'invention concerne également un véhicule automobile équipé d'un tel système d'épuration de gaz d'échappement (1) en liaison fonctionnelle avec le moteur à combustion interne du véhicule automobile. Le système d'épuration de gaz d'échappement (1) selon l'invention permet d'obtenir une meilleure connaissance de la composition de gaz d'échappement dans le système d'épuration des gaz d'échappement (1) en aval de l'accumulateur d'oxydes d'azote (3), notamment pour la commande et le diagnostic de l'accumulateur d'oxydes d'azote (3).
PCT/EP2019/082463 2018-11-26 2019-11-25 Système d'épuration de gaz d'échappement et véhicule automobile WO2020109250A1 (fr)

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DE102018220255.9A DE102018220255A1 (de) 2018-11-26 2018-11-26 Abgasreinigungsanordnung und Kraftfahrzeug

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DE19543219C1 (de) * 1995-11-20 1996-12-05 Daimler Benz Ag Verfahren zum Betreiben eines Dieselmotors
DE10051012A1 (de) * 2000-10-14 2002-04-18 Bayerische Motoren Werke Ag Verfahren und Vorrichtung zum Diagnostizieren der Speichereigenschaften eines NOx-Speicherkatalysators
DE10008563A1 (de) * 2000-01-19 2002-05-02 Volkswagen Ag Verfahren und Vorrichtung zur Diagnose eines NOx-Speicherkatalysators
US6637197B1 (en) * 1999-05-19 2003-10-28 Robert Bosch Gmbh Method for controlling a rich/lean combustion mixture in a defined manner
DE102010028373A1 (de) * 2010-04-29 2011-11-03 Ford Global Technologies, Llc Verfahren und Vorrichtung zur Überwachung des Betriebszustandes eines NOx-Speicherkatalysators
DE102015215501A1 (de) * 2015-08-13 2017-02-16 Robert Bosch Gmbh Bestimmung der Konvertierungseffizienz eines Abgaskatalysators
US20170138284A1 (en) * 2015-11-16 2017-05-18 Honda Motor Co., Ltd. Exhaust gas purifying apparatus for internal combustion engine
EP3401522A1 (fr) * 2017-05-10 2018-11-14 Toyota Jidosha Kabushiki Kaisha Système de commande de gaz d'échappement pour moteur à combustion interne et procédé de commande de système de commande de gaz d'échappement pour moteur à combustion interne

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DE102015221994A1 (de) * 2015-11-09 2017-05-24 Volkswagen Aktiengesellschaft Verfahren zum Betreiben einer aufladbaren Brennkraftmaschine und aufladbare Brennkraftmaschine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19543219C1 (de) * 1995-11-20 1996-12-05 Daimler Benz Ag Verfahren zum Betreiben eines Dieselmotors
US6637197B1 (en) * 1999-05-19 2003-10-28 Robert Bosch Gmbh Method for controlling a rich/lean combustion mixture in a defined manner
DE10008563A1 (de) * 2000-01-19 2002-05-02 Volkswagen Ag Verfahren und Vorrichtung zur Diagnose eines NOx-Speicherkatalysators
DE10051012A1 (de) * 2000-10-14 2002-04-18 Bayerische Motoren Werke Ag Verfahren und Vorrichtung zum Diagnostizieren der Speichereigenschaften eines NOx-Speicherkatalysators
DE102010028373A1 (de) * 2010-04-29 2011-11-03 Ford Global Technologies, Llc Verfahren und Vorrichtung zur Überwachung des Betriebszustandes eines NOx-Speicherkatalysators
DE102015215501A1 (de) * 2015-08-13 2017-02-16 Robert Bosch Gmbh Bestimmung der Konvertierungseffizienz eines Abgaskatalysators
US20170138284A1 (en) * 2015-11-16 2017-05-18 Honda Motor Co., Ltd. Exhaust gas purifying apparatus for internal combustion engine
EP3401522A1 (fr) * 2017-05-10 2018-11-14 Toyota Jidosha Kabushiki Kaisha Système de commande de gaz d'échappement pour moteur à combustion interne et procédé de commande de système de commande de gaz d'échappement pour moteur à combustion interne

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