CN110552766A - Device, method and adaptation module for controlling and/or adjusting an SCR system - Google Patents

Device, method and adaptation module for controlling and/or adjusting an SCR system Download PDF

Info

Publication number
CN110552766A
CN110552766A CN201910455413.1A CN201910455413A CN110552766A CN 110552766 A CN110552766 A CN 110552766A CN 201910455413 A CN201910455413 A CN 201910455413A CN 110552766 A CN110552766 A CN 110552766A
Authority
CN
China
Prior art keywords
exhaust gas
scr catalyst
model
signal
aging
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.)
Pending
Application number
CN201910455413.1A
Other languages
Chinese (zh)
Inventor
阿尔敏·瓦博尼希
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AVL List GmbH
Original Assignee
AVL List 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 AVL List GmbH filed Critical AVL List GmbH
Publication of CN110552766A publication Critical patent/CN110552766A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • 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
    • 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

Landscapes

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

Abstract

The invention relates to a device, a method and an adaptation module (5) for controlling and/or adjusting an SCR system of an exhaust gas aftertreatment system (1) of an internal combustion engine, wherein the device comprises an SCR system having an SCR catalyst, a distribution device (12) for adding fuel and possibly a NO x sensor (4) for forming an adjustment circuit, and a control device (2) having an output which outputs a distribution signal for controlling and/or adjusting the distribution device (12), wherein the adaptation module (5) for adjusting the distribution signal and in particular for adjusting a dosing quantity (15) is provided between the output of the control device (2) and the input of the distribution device (12).

Description

device, method and adaptation module for controlling and/or adjusting an SCR system
Technical Field
The invention relates to a device for controlling and/or regulating an SCR system of an exhaust gas aftertreatment system of an internal combustion engine, wherein the exhaust gas aftertreatment system comprises an SCR catalyst, a distribution device for adding fuel, and optionally NO for forming a control loopxAn SCR system of sensors and a control device having an output for outputting a dispensing signal for controlling and/or adjusting the dispensing device.
The invention also relates to a method for controlling and/or regulating an internal combustion engineMethod for an SCR system of an exhaust gas aftertreatment device, wherein the SCR system comprises an SCR catalyst, a distribution device for adding fuel and optionally NOxAnd the sensor is used for forming a control loop.
Furthermore, the invention relates to an adaptation module.
Background
Different devices and methods for controlling and regulating a distribution device of an exhaust gas aftertreatment system are known from the prior art. For example, a typical motor vehicle includes an exhaust gas aftertreatment device control device, in which a mathematical model of the exhaust gas aftertreatment device is provided. Control device for an exhaust gas aftertreatment system in a conventional motor vehicle as a function of the internal combustion engine NO of the motor vehiclexDischarge to control the dosing of the dispensing device. According to the prior art, the mathematical model of the exhaust gas aftertreatment device control is adapted to the respective motor vehicle by measuring the respective catalyst used in the just-shipped state or in the unaged state.
Disclosure of Invention
The object of the invention is to overcome the disadvantages of the prior art. The object of the invention is, inter alia, to provide a device, a method and an adaptation module, by means of which the dosing quantity of a distribution device can be adapted to the aging state of an SCR catalyst simply, quickly and inexpensively. In addition, the object of the invention is to reduce the pollutant emissions of internal combustion engines and in particular to reduce NOxThe emissions and/or the reducing agent emissions and thus the emission limits specified by the legislator can be met simply and reliably. Furthermore, interventions or modifications of the exhaust gas aftertreatment device control device, in particular of the mathematical model thereof, should be avoided. In addition, the object of the invention is to be able to use the device, the method and the adaptation module, for example, universally in various motor vehicles and to take into account aging of the SCR catalytic converter without having to make changes in the exhaust gas aftertreatment device control, in particular in the closed-loop control loop thereof.
The invention achieves this object by providing a device of the type mentioned in the introduction with an adjustment module between the output of the control device and the input of the dispensing device for adjusting the dispensing signal and in particular for adjusting the dispensing quantity.
It may be provided that in the closed operating mode, in particular in the regulated operation of the internal combustion engine, a fuel suitable for selective catalytic reduction, such as, in particular, a urea-containing mixture, a urea solution orThe fuel may contain a reducing agent such as, inter alia, ammonia NH3Or can be converted into a reducing agent such as, in particular, ammonia NH3. As fuel, preference is given to using urea-containing mixtures and in particular urea-water solutions, e.g.In this case, the fuel may be converted into a reducing agent, in particular ammonia NH, by the reaction shown subsequently3：
Pyrolysis: (NH)2)2CO→NH3+HNCO
Hydrolysis: HNCO + H2O→NH3+CO2
In a first step, urea (NH) is reacted in a pyrolysis reaction2)2CO can be converted into ammonia NH3And HNCO isocyanate. In a second step, in a hydrolysis reaction, the isocyanic acid HNCO is reacted with water H2O can be converted into ammonia NH3and carbon dioxide CO2。
Reducing agent and especially ammonia NH3perhaps at least temporarily, may be stored and/or stored in an SCR catalyst of the SCR system. Optionally, ammonia NH3deposited on the active sites of the SCR catalyst. Reducing agent, in particular ammonia NH, stored at least temporarily3the nitrogen oxides NO can subsequently be reducedxsuch as especially nitric oxide NO and carbon dioxide NO2。
The dispensing of the fuel can take place by means of a dispensing device, such as, in particular, an injector or a nozzle.
In the context of this document, an SCR system may particularly refer to a system comprising an sDPF catalyst, an SCR catalyst, an ASC catalyst and/or an LNT catalyst, i.e. lean NOxTrapping catalysts, or their use with sDPF catalysts, SCR catalysts, ASC catalysts and/or LNTand a catalyst.
In particular, the SCR system also comprises one, two or three devices for fuel dispensing input, a fuel tank and/or possibly also a fuel such as this. In particular, one or more distribution devices are arranged upstream of the SCR system, in particular upstream of the SCR catalytic converter.
It may be provided that the exhaust gas aftertreatment device comprises one or two SCR catalysts, a diesel oxidation catalyst DOC, a diesel particle filter DPF, an ammonia slip catalyst ASC, one or two distributor devices and/or one, two or three NO' sxSensor and/or one, two or three NH3Sensor, in particular an NH after an exhaust gas aftertreatment device3a sensor.
It may be provided that the exhaust gas aftertreatment device comprises a DOC catalytic converter, an SCR catalytic converter, i.e. a catalytic converter designed for selective catalytic reduction of nitrogen oxides and/or an ASC catalytic converter, or that the exhaust gas aftertreatment device is formed by a DOC catalytic converter, an SCR catalytic converter and/or an ASC catalytic converter.
It may be provided that the exhaust gas aftertreatment device comprises a DOC catalytic converter, a DPF catalytic converter, an SCR catalytic converter and/or an ASC catalytic converter, or that the exhaust gas aftertreatment device is formed by a DOC catalytic converter, a DPF catalytic converter, an SCR catalytic converter and/or an ASC catalytic converter.
It may be provided that the exhaust gas aftertreatment device comprises a DOC catalytic converter, an sDPF catalytic converter, i.e. an SCR-coated DPF, an SCR catalytic converter and/or an ASC catalytic converter, or that the exhaust gas aftertreatment device is formed by a DOC catalytic converter, an sDPF catalytic converter, an SCR catalytic converter and/or an ASC catalytic converter.
It may be provided that the exhaust gas aftertreatment device comprises an SCR catalyst, a DOC catalyst, a DPF catalyst, an SCR catalyst and/or an ASC catalyst, or that the exhaust gas aftertreatment device is formed by an SCR catalyst, a DOC catalyst, a DPF catalyst, an SCR catalyst and/or an ASC catalyst.
It may be provided that the exhaust gas aftertreatment device comprises an SCR catalyst, a DOC catalyst, an sspf catalyst, an SCR catalyst and/or an ASC catalyst, or that the exhaust gas aftertreatment device is formed by an SCR catalyst, a DOC catalyst, an ssdpf catalyst, an SCR catalyst and/or an ASC catalyst.
It may be provided that the exhaust gas aftertreatment device comprises a DPF, an SCR and/or an ASC catalytic converter, or that the exhaust gas aftertreatment device is formed by a DPF, an SCR and/or an ASC catalytic converter.
It may be provided that the exhaust gas aftertreatment device comprises an LNT catalyst, an ssdpf catalyst, an SCR catalyst and/or an ASC catalyst, or that the exhaust gas aftertreatment device is formed by an LNT catalyst, an ssdpf catalyst, an SCR catalyst and/or an ASC catalyst.
It may be provided that the exhaust gas aftertreatment device comprises an LNT catalyst, a cDPF catalyst, i.e. a catalytic DPF, an ufSCR catalyst, i.e. an underfloor SCR, and/or an ASC catalyst, or that the exhaust gas aftertreatment device is formed by an LNT catalyst, a cDPF catalyst, a ufSCR catalyst, and/or an ASC catalyst.
it may be provided that the exhaust gas aftertreatment device comprises an LNT catalyst, an SCR catalyst, an ssdpf catalyst and/or an ASC catalyst, or that the exhaust gas aftertreatment device is formed by an LNT catalyst, an SCR catalyst, an ssdpf catalyst and/or an ASC catalyst.
It may be provided that the exhaust gas aftertreatment device comprises an LNT catalyst, an sDPF catalyst, an ufSCR catalyst and/or an ASC catalyst, or that the exhaust gas aftertreatment device is formed by an LNT catalyst, an sDPF catalyst, an ufSCR catalyst and/or an ASC catalyst.
It may be provided that the exhaust gas aftertreatment device comprises an LNT catalyst, an sDPF catalyst, an ufSCR catalyst and/or an ASC catalyst, or that the exhaust gas aftertreatment device is formed by an LNT catalyst, an sDPF catalyst, an ufSCR catalyst and/or an ASC catalyst.
It may be provided that one, two, three, four, five or all of the catalytic converters of the exhaust gas aftertreatment system can be heated or heated, and in particular are designed as electrothermal catalytic converters E-CAT.
It may be provided that the exhaust gas aftertreatment device comprises a "Passive nitrogen oxide adsorber" PNA (Passive NO adsorber) instead of a DOC catalyst and/or instead of a LNT catalystx Adsorber)。
It may be provided that the exhaust gas aftertreatment device comprises a "passive nitrogen oxide adsorber" PNA in addition to the above-described catalyst.
It may be provided that the exhaust gas aftertreatment device comprises a "Pre-turbo catalytic" PTC (Pre-Turbine-Catalyst) in addition to the above-mentioned Catalyst.
It may be provided that the exhaust gas aftertreatment device comprises one or two distribution devices and one, two or three NOxSensor and/or one, two or three NH3sensor, in particular an NH after an exhaust gas aftertreatment device3A sensor.
Within the scope of the present invention, the SCR catalyst may refer to an spdpf catalyst, an SCR catalyst and/or an ASC catalyst.
The device according to the invention has a control device, like a conventional internal combustion engine. The control device can be set up to generate a dispensing signal for controlling and/or regulating the dispensing device and to output this dispensing signal via the output. The dispensing device, and in particular the fuel metering or fuel supply, can be set and/or controlled by means of a dispensing signal generated by the control device.
Preferably, an adjustment module is provided between the control device and the distribution device for adjusting the distribution signal. The adaptation module may change and/or adjust the dispensing signal generated by the control device to be transmitted and/or communicated as an adapted dispensing signal to the dispensing device. In contrast, in conventional internal combustion engines, the distribution signal generated by the control device is forwarded directly and in particular unchanged to the distribution device.
the control device may comprise an input, in particular a data input, by means of which, for example, NO can be inputxThe measured values of the sensors) and outputs, in particular data outputs (whereby it is possible, for example, toOutput assignment signal).
The engine may be a motor vehicle engine.
it may be provided that the adaptation module comprises an aging model for taking into account the aging state of the SCR catalyst and for adjusting the dosing amount to adapt to the aging state of the SCR catalyst.
It may be provided that, in the adaptation module, in particular in the aging model thereof, the distribution signal and the exhaust gas temperature signal are input as input signals, and that the distribution signal adapted by the aging model is output as an output signal from the adaptation module, in particular the aging model thereof. Within the scope of the invention, it is alternatively or additionally possible to use the adaptation model and in particular its aging model as an input signal, for example, the input fuel consumption, the fuel consumption or a component toxic to the SCR catalyst, for example the concentration of phosphorus or sulfur in the fuel.
It may be provided that the adaptation module comprises an aging model, by means of which a respective aging state of the SCR catalyst can be calculated and/or determined. That is, a calculation model for calculating or determining the aging of the SCR catalyst may be provided in the adaptation module.
In particular, it can be provided that, in the adaptation module, and in particular in the aging model thereof, an exhaust gas temperature, and in particular an exhaust gas temperature upstream of the SCR catalyst, is input as an input variable for calculating the aging state of the SCR catalyst. From the exhaust gas temperature, the SCR catalyst substrate temperature can be calculated, for example. The determination and/or calculation of the aging state of the SCR catalyst as a function of the course of the temperature of the SCR catalyst substrate can thereby be carried out.
It may be provided that the substrate temperature of the SCR catalyst is input as an input parameter into the adaptation module. It may be provided that the exhaust gas temperature and/or the SCR catalyst substrate temperature are calculated in the adaptation module itself, are taken over by the control device and/or are recorded by means of a temperature sensor.
It may be provided that the control device allocation signal fed into the adaptation module is adapted and/or changed as a function of the determined and/or calculated aging state of the SCR catalyst. In this way, an adjusted distribution signal can be generated in the adjustment module from the input control device distribution signal, which in turn controls and/or adjusts the distribution device.
It may be provided that the control device comprises a kinematic model and/or a physical model of the exhaust gas aftertreatment components of the exhaust gas aftertreatment system, wherein the physical models, in addition to the actual operation, also calculate the physical processes which are decisive for the exhaust gas aftertreatment components, and/or wherein the kinematic models, in addition to the actual operation, also calculate the reactions which are decisive for the exhaust gas aftertreatment components.
It may be provided that the kinematic model and/or the physical model calculates and/or generates a dispensing signal for controlling and/or adjusting the dispensing device.
It may be provided that the kinematic and/or physical models are mathematical maps of the exhaust gas treatment components.
It may be provided that reactions which play an important role are mapped in terms of mathematical-physical relationships in the kinematic model of the control device. The reactions simulated in the kinematic model may thus be based on physical conditions. For example, a kinematic model may also be used to map reductant oxidation, particularly NH3And (4) oxidizing. For example, such a kinematic Model applies Holluf, Bernd Master thesis (2009) "Model-Based Closed-Loop Control of SCR base Deno at science and technology university, KennentxSystems "are disclosed.
for example, it can be provided that the exhaust gas aftertreatment component is mapped in the control device in physical form by a one-dimensional exhaust gas aftertreatment component model. In this model, the heat capacities of the gas and the substrate, as well as the thermal conduction between the gas and the substrate and the thermal conduction between the substrate and the environment, can be taken into account.
In particular, it is provided that a dispensing signal for controlling and/or regulating the dispensing device is calculated and/or generated by the control device, in particular a kinematic and/or physical model thereof.
It may be provided that the control device comprises a regulator for adapting a distribution signal to be output by the control device, and that the regulator is dependent on the NO after the SCR systemxThe measurement signal of the sensor is used to adapt and/or adjust the dispensing signal to be output.
Adjustments may be provided in the control deviceA regulator or regulating device, which, before outputting the distribution signal, depends on the measured NO after the SCR systemxThe dispense signal is adjusted and/or regulated by the discharge.
That is to say, the control device can be based in particular on NO after the SCR systemxThe measurement signal of the sensor adjusts the dispense signal. This makes it possible to generate NO after the SCR systemxThe dispensing signal is adjusted after the discharge and/or the reductant discharge.
probably because of NOxLateral sensitivity of the sensor, the reductant emission occurring as NOxEmissions are found, whereby in common devices hazardous emissions are only partially reduced and/or prevented by adapting the dispense signal before outputting it.
According to the invention, said further task is thus accomplished, a method of the type mentioned in the introduction comprising the steps of: the control device generates a dispensing signal for controlling and/or regulating the dispensing device, in particular the dispensing quantity, the dispensing signal is adapted in an adaptation module arranged between an output of the control device and an input of the dispensing device to generate an adapted dispensing signal, and the dispensing device is controlled and/or regulated, in particular the dispensing quantity, by the adapted dispensing signal.
The distribution signal generated by the control device for controlling and/or adjusting the distribution device is preferably adjusted in an adaptation module and an adapted distribution signal is generated. With the adapted dispensing signal, the dispensing device and in particular the metering or fuel supply can be adjusted and/or controlled.
It may be provided that the method steps of the method are carried out successively as described above. That is to say, the dispensing signal for controlling and/or regulating the dispensing device may first be generated in the control device. The distribution signal may then be adapted in an adaptation module and thereby generate an adapted distribution signal. With the adapted dispensing signal, the dispensing device can then be controlled and/or adjusted.
It may be provided that the method is run automatically, in particular in an adaptation module.
It may be provided that the adapted distribution signal is generated using an aging model set in the adaptation module, and that the aging state of the SCR catalyst is taken into account in the aging model, and that the dosing quantity is adapted to the aging state of the SCR catalyst.
It may be provided that the exhaust gas temperature and/or the SCR catalyst temperature are taken into account in the adaptation module and in particular in its aging model, that the aging state of the SCR catalyst is determined taking into account the exhaust gas temperature and/or the SCR catalyst temperature, and that the distribution signal is adjusted in the adaptation module and in particular in its aging model taking into account the determined aging state of the SCR catalyst.
By means of the adaptation module and in particular its aging model, an adapted distribution signal can be generated, whereby the dosing quantity or the fuel supply can be adapted to the aging state of the SCR catalyst.
That is, in some cases, the dosing amount calculated by the control device is too high or too low because the age state of the SCR catalyst is not taken into account, whereby NOx emissions and/or reductant emissions may occur after the SCR system. The dispense signal or dose may be adapted in an adaptation module. This makes it possible to adapt the dispensing signal or the dosing quantity to the aging of the SCR catalytic converter and to avoid and/or prevent an overdosing and/or an underfilling of the fuel and in particular of the reducing agent.
it may be provided that, in the adaptation module, in particular in the aging model thereof, the time periods in which the SCR catalyst substrate exceeds the predetermined substrate temperature threshold are added to form a total time period, that the SCR catalyst aging state is determined as a function of the determined total time period, and that the distribution signal is adapted in the adaptation module, in particular in the aging model thereof, taking into account the determined SCR catalyst aging state.
The adaptation module, and in particular the aging model thereof, can determine and/or calculate the SCR catalyst substrate temperature profile from the exhaust gas temperature. From this, the time periods in which the SCR catalyst substrate exceeds at least one predetermined and/or at least one preset substrate temperature threshold can be determined.
These time periods may be added to a total time period. From this it can be determined how long the SCR catalyst substrate is above or equal to the substrate temperature threshold or the specified temperature range.
Furthermore, the aging state of the SCR catalyst can be determined or calculated as a function of the course of the temperature change of the SCR catalyst substrate and/or the determined total time period by adapting the module and in particular by means of its aging model. The total time period is a time period during which the temperature of the SCR catalyst substrate indicated is greater than or equal to a predetermined substrate temperature threshold.
The aging model may be based on measured data of the SCR catalyst that was just shipped or that was not aged and/or aged. In particular, it can be provided that, in order to provide data to the adaptation module and in particular to the aging model thereof, the SCR catalyst is measured in the unaged state and in the defined aging state. For example, a defined aging state can be generated in that the SCR catalyst substrate is heated to or above a predetermined substrate temperature threshold for a certain period of time. The aging state may be determined for another total time period, perhaps by means of the reference point thus generated.
In the context of the present invention, the measurement of the SCR catalytic converter is in particular: maximum reductant storage capacity, in particular ammonia storage capacity, NO of SCR catalystxConversion or NOxConversion, etc. are determined.
By determining and/or calculating the SCR catalyst aging state, the distribution signal, in particular the dosing amount or the fuel supply, can be adapted to the respective aging state of the SCR catalyst in the adaptation module and an adapted distribution signal is generated.
It may be provided that, in the control device, the exhaust gas aftertreatment components of the exhaust gas aftertreatment system are mapped with kinematic models and/or physical models, wherein physical processes which are decisive for the exhaust gas aftertreatment components are also calculated in the physical models in addition to the actual operation, and/or wherein reactions which are decisive for the exhaust gas aftertreatment components are also calculated in the kinematic models in addition to the actual operation.
It may be provided that the distribution signal is calculated and/or generated in a kinematic and/or physical model of the SCR catalytic converter for controlling and/or regulating the distribution device.
It may be provided that the control device is adapted to the distribution signal to be output by a regulator provided in the control device and by means of which the NO after the SCR system is dependentxThe measurement signal of the sensor adapts or adjusts the dispensing signal to be output.
The further object is achieved when an adaptation module of the type mentioned in the introduction is set up for forming the device of the invention and/or for carrying out the method of the invention.
The adaptation module can be easily and quickly arranged between the control device and the distribution device in different internal combustion engines. The adaptation module can be connected in particular to a distribution signal output by the control device, in particular to an output and/or data output of the control device and to an input and/or data input of the distribution device.
In all embodiments, the adaptation module may be a software module, or alternatively a hardware module. In this case, it can be provided that the hardware module is designed as a control device with a software module.
This makes it possible to take into account the aging state of the SCR catalytic converter without having to change the control device and in particular its closed-loop control circuit.
Drawings
other inventive features may be derived from the claims, the description of the embodiments and the drawings.
The invention will now be further described by way of examples of illustrative but not exclusive embodiments.
Figure 1 shows a schematic view of a first embodiment of the device of the invention,
Figures 2a and 2b show in terms of two different schematic graphs how the ageing of the SCR catalyst is taken into account in the method according to the invention according to the first embodiment,
FIGS. 3a and 3b show, according to two different schematic graphs, how the aging of the SCR catalyst is taken into account in the method according to the second embodiment of the invention, and
fig. 4a and 4b show, according to two different schematic graphs, how the aging of the SCR catalyst is taken into account in the method according to the third embodiment.
Detailed Description
Unless otherwise indicated, the reference numerals correspond to the following components:
Exhaust gas aftertreatment device 1, control device 2, internal combustion engine 3, NOxSensor 4, adaptation module 5, SCR model 6, ASC model 7, DPF model 8, DOC model 9, regulator 10, desired value 11, distribution device 12, aging model 13, loading 14 of the SCR catalyst, dosing 15 and time 16.
Fig. 1 shows a schematic view of a first embodiment of the inventive device.
The exhaust gas aftertreatment device 1 of the internal combustion engine 3 comprises according to this embodiment a diesel oxidation catalyst DOC, a diesel particle filter DPF, a catalyst SCR set up for selective catalytic reduction and an ammonia slip catalyst ASC. In addition, a NO is provided downstream of the internal combustion engine and the SCR systemxA sensor 4.
Before the SCR system, in particular the SCR catalytic converter, a fuel suitable for selective catalytic reduction, such as in particular a urea-containing mixture, a urea solution orThe fuel may contain a reducing agent such as, inter alia, ammonia NH3Or can be converted into a reducing agent such as, in particular, ammonia NH3。
Reducing agent and especially ammonia NH3Perhaps at least temporarily, may be stored and/or stored in an SCR catalyst of the SCR system. Optionally, ammonia NH3Deposited on the active sites of the SCR catalyst. Reducing agent, in particular ammonia NH, stored at least temporarily3the nitrogen oxides NO can subsequently be reducedxsuch as especially nitric oxide NO and nitrogen dioxide NO2。
Furthermore, a control device 2 is provided, which comprises a kinematic model and/or a physical model of the respective exhaust gas treatment component. According to this embodiment, the control device 2 comprises a kinematic and/or physical model of the diesel oxidation catalyst, the so-called DOC model 9, a kinematic and/or physical model of the diesel particulate filter, the so-called DPF model 8, a kinematic and/or physical model of the catalyst set up for selective catalytic reduction, the so-called SCR model 6, and a kinematic and/or physical model of the ammonia slip catalyst, the so-called ASC model 7.
The dispensing signal and/or the dosing quantity 15 of fuel is calculated and/or determined using a physical and/or kinematic model of the control device 2, in particular of the SCR catalyst. According to this embodiment, the distribution signal determined by the model of the SCR catalyst is changed by a regulator 10 provided in the control device, in which regulator the desired value 11 and the NO after the SCR system are enteredxThe measurement signal of the sensor 4. The dispensing signal changed by the regulator 10 is then output from the control device 2 in order to control and/or regulate the dispensing device 12.
According to this embodiment, an adaptation module 5 is provided between the control device 2 and the distribution device 12. The distribution signal output by the control device 2 is converted into an adapted distribution signal in an adaptation module 5. An aging model 13 is provided in the adaptation module 5, which can calculate and/or determine the aging of the SCR catalyst on the basis of the course of the SCR catalyst substrate temperature change.
That is to say, according to this embodiment, the distribution signal of the control device 2 and the exhaust gas temperature upstream of the SCR catalyst are input in the adaptation module 5. The substrate temperature of the SCR catalyst is calculated using the exhaust gas temperature before the SCR catalyst.
According to this embodiment, the "respective time periods during which the SCR catalyst substrate exceeds at least one predetermined and/or at least one preset substrate temperature threshold" are determined and added to one total time period. It is thus possible to determine how long the SCR catalyst substrate has a temperature that is greater than or equal to a substrate temperature threshold or a specified temperature range.
In this embodiment, in order to give data to the aging model 13 of the adaptation module 5, the SCR catalyst of the exhaust gas aftertreatment device 1 is measured in the unaged state and in the aged state. The aging state of the SCR catalyst is produced in that the substrate of the SCR catalyst is heated to a defined temperature for a defined time. The state of ageing of the SCR catalyst may be brought about by operating the motor vehicle on an engine test stand or an integrated gas test stand. Perhaps, the SCR catalyst is aged by heating in a furnace. In one embodiment, which is not shown, in order to assign data to the aging model 13 of the adaptation module 5, a plurality of SCR catalysts in a defined aging state are measured.
By means of the generated reference point, the aging state can be determined for another total time period.
In one embodiment, which is not shown, the exhaust gas temperature or the SCR catalyst substrate temperature before the SCR catalyst can be calculated in the adaptation module 5 or measured by a temperature sensor connected to the adaptation module 5. In principle, however, it is advantageous if the temperature is used only in the aging model 13 and an indicator for the aging state of the SCR catalyst is used in the adaptation module 5.
Fig. 2a and 2b show, on the basis of two different schematic graphs, how the aging of the SCR catalyst is taken into account in the adaptation module 5 in the method according to the first embodiment. In particular, fig. 2a and 2b show NO when the SCR catalyst is NOxConversion or NOxHow the efficiency of the exhaust gas aftertreatment device 1 is increased by the method according to the invention when the conversion is impaired by its ageing.
the loading of the SCR catalyst is shown in the first of the two graphs as a function of time 16. In the second of these two graphs, the dosing 15 of fuel (in mg/sec) is shown in relation to time 16. The features of the embodiment according to fig. 2a and 2b may preferably correspond to the features of the embodiment according to fig. 1.
In fig. 2a, the dashed line shows the current loading state of the SCR catalyst, and the solid line shows the SCR catalyst loading state as predetermined by the SCR model of the control device.
Fig. 2b shows the respective metering quantity 15 of fuel, which is required to achieve the respective loading state specified in fig. 2 a. In this embodiment, the fuel may be converted to a reductant, particularly ammonia NH3. The solid line indicates: the amount of fuel that has to be dispensed in order to achieve a predetermined loading state in the SCR catalyst that has just been shipped or is not aged. Deficiency of QiThe lines represent: the amount of fuel that has to be dispensed in order to obtain a predetermined loading state in the aged SCR catalyst.
In fig. 2b, it can be seen that when the aging state of the SCR catalytic converter is not taken into account, excess fuel is always dispensed under constant engine conditions.
Excessive dispensing of fuel, in turn, may result in greater consumption of reductant and/or reductant emissions.
Fig. 3a and 3b show, according to two different schematic graphs, how the aging of the SCR catalyst is taken into account in the adaptation module 5 in the method according to the second embodiment. Fig. 3a and 3b in particular show how the efficiency of an exhaust gas aftertreatment device can be increased by the method according to the invention when the reducing agent storage capacity, in particular the ammonia storage capacity, of the SCR catalyst is reduced as a result of its aging.
In the first of these two graphs, the loading of the SCR catalyst 14 is plotted as a function of time 16. In the second of these two graphs, the dosing amount of fuel 15 is plotted in mg/sec against time. The features of the embodiment according to fig. 3a and 3b may preferably correspond to the features of the embodiment according to fig. 1 and/or fig. 2a and 2 b.
Fig. 3a corresponds substantially to fig. 2 a.
In fig. 3b it can be seen that when the aging state of the SCR catalyst is not taken into account, too little and/or too much fuel is always dispensed at transient engine conditions. The hatched area in fig. 3b indicates the amount of fuel dispensed too much or too little in the transition-like phase.
To reduce or prevent NO because the ammonia storage capacity decreases with age of the SCR catalystxEmissions and/or reductant emissions must take into account the amount of fuel dispensed as the SCR catalyst loading state changes.
Otherwise, if the SCR catalyst loading state requested by the control device 2 is reduced, the requested loading state is not reached because the fuel supply required for the SCR catalyst just shipped is strongly reduced. By means of NO produced by the combustion engine 3, due to the occurrence of fuel under-distributionxis discharged and is excessively consumedAnd will not reach the desired loading state of the SCR catalyst. NO is then present after the SCR systemxAnd (5) discharging.
Otherwise, when the control device 2 requests an increase in the loading state of the SCR catalyst, the requested loading state is exceeded because of the need to significantly increase the fuel supply in the SCR catalyst that was just shipped. As an over-apportioned fuel occurs, excess reductant will be input and the required loading state of the SCR catalyst will be exceeded. Furthermore, the emission of reducing agent after the SCR system can occur by a possible overloading of the SCR catalyst and the consumption of reducing agent is unnecessarily increased.
Fig. 4a and 4b show, according to two different schematic graphs, that the aging of the SCR catalyst is taken into account in the adaptation module 5 in the method according to the third embodiment. In particular, FIGS. 4a and 4b show when NO is presentxConversion or NOxHow the efficiency of the exhaust gas aftertreatment device 1 can be increased by the method according to the invention when the reducing agent storage capacity, and in particular the ammonia storage capacity, of the conversion and SCR catalyst is impaired by its aging.
In the first of these two graphs, the loading of the SCR catalyst 14 is plotted as a function of time 16. In the second of these two graphs, the dosing amount of fuel 15 is plotted in mg/sec in relation to time 16. The features of the embodiment according to fig. 4a and 4b may preferably correspond to the features of the embodiment according to fig. 1, 2a and 2b, and/or 3a and 3 b.
Fig. 4a corresponds substantially to fig. 2 a.
It can be seen in fig. 4b that, when the aging state of the SCR catalytic converter is taken into account, the NO reduced by aging is always taken into account substantially under constant internal combustion engine 3 conditionsxconversion or NOxThe ammonia storage capacity of the SCR catalyst, which is reduced by aging, is converted and substantially taken into account in the transient conditions of the internal combustion engine 3.
NO after the SCR catalyst can thereby be reduced and/or avoidedxEmissions and reductant emissions.
the invention is not limited to the embodiments shown, but encompasses all apparatuses and methods according to the claims below and an adaptation module 5, which is set up for forming an apparatus of the invention and/or for carrying out a method of the invention.

Claims (15)

1. An SCR system for controlling and/or regulating an exhaust gas aftertreatment device (1) of an internal combustion engine (3), comprising:
-an SCR system with an SCR catalyst, a distribution device (12) for adding fuel and possibly NO for forming a regulation circuitxA sensor (4) for detecting the position of the object,
-a control device (2) having an output for outputting a dispensing signal for controlling and/or adjusting the dispensing device (12),
It is characterized in that the utility model is characterized in that,
-an adaptation module (5) is provided between the output of the control device (2) and the input of the dispensing device (12) for adapting the dispensing signal, in particular for adapting the dosage (15).
2. An arrangement according to claim 1, characterised in that the adaptation module comprises an ageing model (13) for taking into account the ageing state of the SCR catalyst and for adjusting the dosing amount (15) to adapt to the ageing state of the SCR catalyst.
3. The device according to claim 1 or 2,
-inputting the distribution signal and the temperature signal of the exhaust gas as input signals to the adaptation module (5), in particular to an aging model (13),
-outputting the distribution signal adapted by the aging model (13) as an output signal from the adaptation module (5), in particular from the aging model (13) thereof.
4. The device according to one of the preceding claims,
-the control device (2) comprises a kinematic model and/or a physical model of the exhaust gas aftertreatment components of the exhaust gas aftertreatment apparatus (1),
Wherein the physical models, in addition to the actual operation, also calculate the physical processes which are decisive for the exhaust gas aftertreatment components,
And/or wherein the kinematic models, in addition to the actual operation, also calculate the reactions which are decisive for the exhaust gas aftertreatment components.
5. Device according to claim 4, characterized in that the kinematic model and/or the physical model calculates and/or generates the dispensing signal for controlling and/or adjusting the dispensing device (12).
6. Device according to claim 4 or 5, characterized in that the kinematic models and/or the physical models are mathematical maps of the exhaust gas aftertreatment components.
7. The device according to one of the preceding claims,
-the control device (2) comprises a regulator (10) for regulating a dispensing signal to be output of the control device (2),
And the regulator (10) depends on NO after the SCR systemxThe measurement signal of the sensor (4) is used to adapt and/or adjust the dispensing signal to be output.
8. A method for controlling and/or regulating an SCR system of an exhaust gas aftertreatment device (1) of an internal combustion engine (3),
-wherein the SCR system comprises an SCR catalyst, a distribution device (12) for adding fuel and possibly NO for forming a regulation circuitxA sensor (4) for detecting the position of the object,
The method comprises the following steps:
-generating a dispensing signal in the control device (2) for controlling and/or regulating the dispensing device (12), in particular the dosing quantity (15),
-generating an adapted distribution signal by adapting the distribution signal in an adaptation module (5) provided between an output of the control device (2) and an input of the distribution device (12),
-controlling and/or adjusting the dispensing device (12), in particular controlling and/or adjusting the dosing amount (15), by means of an adapted dispensing signal.
9. the method as set forth in claim 8, wherein,
-the generation of the adapted distribution signal is performed with the use of an aging model (13) provided in the adaptation module (5),
-taking into account the aging state of the SCR catalyst in an aging model (13), and adapting the dosing quantity (15) according to the aging state of the SCR catalyst.
10. The method according to claim 8 or 9, characterized in that,
-taking into account the exhaust gas temperature and/or the SCR catalyst temperature in the adaptation module (5), in particular in an aging model (13) thereof,
The state of aging of the SCR catalyst is determined taking into account the exhaust gas temperature and/or the SCR catalyst temperature,
-and the distribution signal is adjusted in the adaptation module (5), and in particular in an aging model (13) thereof, taking into account the determined aging state of the SCR catalyst.
11. The method according to one of claims 8 to 10,
-in the adaptation module (5), in particular in its aging model (13), the time periods during which the SCR catalyst substrate exceeds a predetermined substrate temperature threshold are added to obtain a total time period,
The aging state of the SCR catalyst is determined as a function of the ascertained total time period,
-the distribution signal is adjusted in the adaptation module (5), in particular in an aging model (13) thereof, taking into account the determined aging state of the SCR catalyst.
12. The method according to one of claims 8 to 11,
-mapping exhaust gas aftertreatment components of the exhaust gas aftertreatment device with a kinematic model and/or a physical model in the control device (2),
Wherein, in each physical model, in addition to the actual operation, physical processes which are decisive for each exhaust gas aftertreatment component are calculated,
and/or wherein, in each kinematic model, in addition to the actual operation, also the reactions which are decisive for the respective exhaust-gas aftertreatment component are calculated.
13. Method according to claim 12, characterized in that the distribution signal for controlling and/or adjusting the distribution device (12) is calculated and/or generated in a kinematic model and/or a physical model of the SCR catalyst.
14. The method according to one of claims 8 to 13,
the distribution signal of the control device (2) to be output is adjusted by an adjuster (10) provided in the control device (2),
-by means of the regulator (10) depending on the NO after the SCR systemxThe measurement signal of the sensor (4) is adapted or adjusted to the dispensing signal to be output.
15. An adaptation module (5) set up for forming an apparatus according to one of claims 1 to 7 and/or for carrying out a method according to one of claims 8 to 14.
CN201910455413.1A 2018-05-30 2019-05-29 Device, method and adaptation module for controlling and/or adjusting an SCR system Pending CN110552766A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50440/2018A AT521323B1 (en) 2018-05-30 2018-05-30 Arrangement, method and adaptation module for controlling and / or regulating an SCR system
ATA50440/2018 2018-05-30

Publications (1)

Publication Number Publication Date
CN110552766A true CN110552766A (en) 2019-12-10

Family

ID=68736391

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910455413.1A Pending CN110552766A (en) 2018-05-30 2019-05-29 Device, method and adaptation module for controlling and/or adjusting an SCR system

Country Status (2)

Country Link
CN (1) CN110552766A (en)
AT (1) AT521323B1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101910578A (en) * 2008-01-14 2010-12-08 罗伯特.博世有限公司 Method and control device for controlling the reducing agent feed to a scr catalyst
US20110030348A1 (en) * 2009-08-06 2011-02-10 Gm Global Technology Operations, Inc. System and methods for controlling selective catalytic reduction systems
CN104005824A (en) * 2014-05-27 2014-08-27 潍柴动力股份有限公司 Semiconductor control rectifier (SCR) emission control system and method
CN106812577A (en) * 2017-03-30 2017-06-09 无锡威孚力达催化净化器有限责任公司 Scr system control device
CN107923292A (en) * 2015-07-07 2018-04-17 Mtu 腓特烈港有限责任公司 Method for running the exhausted gas post-processing system with SCR catalyst

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7810313B2 (en) * 2007-03-19 2010-10-12 Honeywell International Inc. Method and system for the simultaneous measurement of a plurality of properties associated with an exhaust gas mixture
WO2009135060A2 (en) * 2008-04-30 2009-11-05 Cummins Ip, Inc. Apparatus, system, and method for reducing nox emissions on an scr catalyst
US7858060B2 (en) * 2008-07-30 2010-12-28 Gm Global Technology Operations, Inc Current storage estimation for selective catalytic reduction catalysts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101910578A (en) * 2008-01-14 2010-12-08 罗伯特.博世有限公司 Method and control device for controlling the reducing agent feed to a scr catalyst
US20110030348A1 (en) * 2009-08-06 2011-02-10 Gm Global Technology Operations, Inc. System and methods for controlling selective catalytic reduction systems
CN104005824A (en) * 2014-05-27 2014-08-27 潍柴动力股份有限公司 Semiconductor control rectifier (SCR) emission control system and method
CN107923292A (en) * 2015-07-07 2018-04-17 Mtu 腓特烈港有限责任公司 Method for running the exhausted gas post-processing system with SCR catalyst
CN106812577A (en) * 2017-03-30 2017-06-09 无锡威孚力达催化净化器有限责任公司 Scr system control device

Also Published As

Publication number Publication date
AT521323A1 (en) 2019-12-15
AT521323B1 (en) 2021-11-15

Similar Documents

Publication Publication Date Title
DE102008017544B4 (en) Exhaust after-treatment system and method for controlling an amount of NH3 stored in a catalyst
US9206722B2 (en) Method for reducing nitrogen oxide levels in diesel engine exhaust gases
US8141340B2 (en) Apparatus, system, and method for determining the degradation of an SCR catalyst
US9779218B2 (en) Method for model-based determination of a temperature distribution of an exhaust gas post-treatment unit
US8713917B2 (en) Method for reducing NH3 release from SCR catalysts during thermal transients
US9353664B2 (en) Method for operating an exhaust gas treatment system having an SCR catalytic converter
US20100281855A1 (en) Model based method for selective catalyst reducer urea dosing strategy
US20060000202A1 (en) Method for operating a catalytic converter used for purifying the exhaust gas of an internal combustion engine and a device for implementing the method
US9644521B2 (en) Method for operating an exhaust gas purification system of a motor vehicle combustion engine
CN107975407B (en) Method for regulating an exhaust gas aftertreatment device of an internal combustion engine
US8898032B2 (en) Method for estimating an exhaust gas temperature
US11008921B1 (en) Selective catalytic reduction device control
US20190353071A1 (en) Selective catalytic reduction device control
US20140056788A1 (en) Method for the model-based feedback control of an scr system having at least one scr catalytic converter
US10071344B2 (en) Reductant dosing control using prediction of exhaust species in selective catalytic reduction
US10954838B2 (en) System and methods of integrated control of combustion and SCR systems
CN105102781A (en) Method of controlling ammonia levels in catalytic units
CN113454315B (en) Method and device for controlling at least one SCR catalytic converter of a vehicle
CN112567113B (en) Method for increasing the efficiency of an SCR system and internal combustion engine
CN113544365A (en) Method for regulating the loading of a particle filter
CN110552766A (en) Device, method and adaptation module for controlling and/or adjusting an SCR system
CN113417752B (en) Optimization control method and device and electronic equipment
CN115234348A (en) Control device for regulating an SCR system in an exhaust tract
CN116745508A (en) Reductant dosing control system
CN109415961B (en) Method and system for correcting the supply of an additive to an exhaust gas stream

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination