EP3504407A1 - Procédé pour contrôler la qualité d'une solution d'agent de réduction dans un catalyseur rcs - Google Patents

Procédé pour contrôler la qualité d'une solution d'agent de réduction dans un catalyseur rcs

Info

Publication number
EP3504407A1
EP3504407A1 EP17732885.3A EP17732885A EP3504407A1 EP 3504407 A1 EP3504407 A1 EP 3504407A1 EP 17732885 A EP17732885 A EP 17732885A EP 3504407 A1 EP3504407 A1 EP 3504407A1
Authority
EP
European Patent Office
Prior art keywords
mass
ammonia mass
ammonia
modeled
reducing agent
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.)
Withdrawn
Application number
EP17732885.3A
Other languages
German (de)
English (en)
Inventor
Christian Heimann
Tobias Pfister
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3504407A1 publication Critical patent/EP3504407A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F01N3/10—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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0412—Methods of control or diagnosing using pre-calibrated maps, tables or charts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0418—Methods of control or diagnosing using integration or an accumulated value within an elapsed period
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1411—Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1616—NH3-slip from catalyst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1621—Catalyst conversion efficiency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1818—Concentration of the reducing agent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a method for quality control of a reducing agent solution in an S CR catalyst with a nitrogen oxide regulator. Furthermore, the present invention relates to a computer program that executes each step of the method according to the invention, when it runs on a computing device, as well as a machine-readable storage medium, which stores the computer program. Finally, the invention relates to an electronic control device which is set up to carry out the method according to the invention.
  • the S CR catalysts known today store ammonia at their catalyst surface.
  • the storage capacity is decisive for the temperature the catalyst surface and decreases with increasing temperature. The more ammonia bound to the catalyst surface and available for reduction, the higher the nitrogen oxide conversion rate. As long as the storage capacity of the S CR catalyst is not exhausted, excessively metered reducing agent is stored. On the other hand, if the metering unit makes available less reducing agent than would be necessary for the complete reduction of the nitrogen oxides present in the exhaust gas, the reduction of the CO 2, which continues to take place at the catalyst surface, becomes necessary
  • Nitrogen oxides which reduces ammonia level.
  • Today's standard dosing strategies for SCR systems include a level control, which sets an operating point in the form of a target value for the ammonia level in the S CR catalyst. This operating point is chosen so that the ammonia level is high enough to ensure both a high nitrogen oxide conversion rate, as well as a buffer against sudden excessive nitrogen oxide masses, so-called nitric oxide peaks.
  • the ammonia level is selected depending on a maximum ammonia mass that can store the S CR catalyst. As a result, especially at rapid temperature rises, avoiding excessively metered ammonia unused
  • a quality of the urea water solution is called quotient of a
  • a nitrogen or ammonia concentration in the exhaust gas is determined by an exhaust gas sensor arranged downstream of the S CR catalyst. Subsequently, these determined values are compared with comparative values and, in the case of a deviation, a reduced quality of the reducing agent is concluded.
  • Common nitric oxide sensors show a cross-sensitivity to ammonia, ie their sensor signal not only contains the nitric oxide concentration, but also shows a composite signal of nitrogen oxide and ammonia.
  • DE 10 2010 002 620 A1 describes an adjustment of the dosing mass by means of an adaptation factor, which indicates the ratio between nominal and actual dosing mass. This directly changes a precursor mass of the reducing agent and serves to regulate a nitrogen oxide concentration measured by the sensor downstream of the SCR catalyst to a modeled nitrogen oxide value.
  • the dosing strategy adapts to the respective system and to longer-lasting environmental influences with the aid of an I-controller and can thus contribute to the number of necessary adaptation interventions
  • the I controller acts very accurately, but also correspondingly slow and can, depending on the quality of the reducing agent and its dilution, several hours to detect a fault and to control needed.
  • the detection of the dilution of the reducing agent takes place here via the adaptation factor or via a threshold value which corresponds to the adaptation factor.
  • Another possibility for monitoring the quality of the reducing agent is a quality sensor, as described in DE 10 2014 211 010 A1. This quality sensor is arranged directly in the reducing agent tank and analyzes the ammonia concentration by means of acoustic and / or optical methods.
  • DE 10 2012 209 240 AI describes a method for
  • a third possibility to monitor the quality of the reducing agent is passive monitoring of the S CR catalyst, in which a nitrogen oxide concentration upstream and downstream of the S CR catalyst is detected by nitrogen oxide sensors and an efficiency is determined therefrom. Error detection occurs when a limit efficiency is exceeded for a set duration.
  • the process is especially suitable strong
  • This fast P-controller permanently compensates the modeled nitrogen oxide concentration downstream of the S CR catalyst with the corresponding signal from the corresponding nitrogen oxide sensor. In case of a deviation, the P-controller can within a few seconds the
  • the method is used for quality control of a reducing agent solution for a S CR catalyst comprising a nitrogen oxide regulator, which at the beginning of the
  • Process controls the S CR catalyst so that it meets a predetermined nitrogen oxide conversion rate, that is, that the S CR catalyst a
  • a maximum nitrogen oxide conversion rate is set.
  • a metering factor is calculated by a quotient of the two
  • Ammonia masses is formed.
  • the metered amount of the reducing agent is increased by the nitrogen oxide regulator to compensate for a poorer quality of the reducing agent and to achieve the high nitrogen oxide conversion rate. It follows that the increase in the dosage of the
  • Reducing agent leads to an increase in the metering factor. If this calculated metering factor exceeds a predetermined first threshold, an error condition is generated in the system, which ascribes a poor quality to the reducing agent solution. Finally, an error memory entry is made in an electronic control unit which controls the metering of the reducing agent.
  • the calculation of the metering factor is carried out only if it was determined in a query that the actual ammonia mass and / or the modeled ammonia mass has exceeded a predetermined limit mass.
  • This limit mass is dependent on the specified nitrogen oxide conversion rate. As a result, it is ensured that the quotient between the actual ammonia mass and the modeled
  • Ammonia mass is large enough so that an increase in the metering factor can be seen and this provides meaningful results.
  • the error state can be canceled again if the metering factor undershoots a specified second threshold. In this case, the quality of the reducing agent is again sufficiently good to again perform a conventional dosage.
  • an opening duration and an opening frequency of a metering valve, which injects the reducing agent upstream of the S CR catalyst may preferably be included.
  • the modeled ammonia mass can preferably correspond to a calculated pilot mass.
  • This pilot mass represents a calculated mass of ammonia that is injected to produce a desired ammonia mass Nitrogen oxide concentration downstream of the S CR catalyst to achieve. This is calculated by multiplying a nitrogen oxide concentration upstream of the SCR catalyst with an exhaust mass flow and a stoichiometric factor and a modeled nitrogen oxide efficiency, wherein the stoichiometric factor is a ratio between nitrogen oxide mass and
  • the integration of the actual and the modeled ammonia mass is permanently interrupted, but the calculation of the metering factor is time-discrete.
  • the frequency of calculating the dosing factor may be dependent on a duration until a predetermined limit is reached in the integration of the actual or modeled ammonia mass.
  • this limit corresponds to the previously described
  • a sensitivity of the filter is dependent on a time interval to a last night Nachankereignis the reducing agent.
  • the computer program is set up every step of the procedure
  • Control unit which is set up, the quality control of
  • FIG. 1 shows a diagram of a nitrogen oxide conversion rate depending on an ammonia level during filling and emptying of an SCR catalyst and ammonia slip, according to the prior art.
  • FIG. 2 shows a flow diagram of an embodiment of the invention
  • FIG. 3 shows a diagram of a time profile of an actual and a modeled ammonia mass in the S CR catalyst, according to FIG
  • Figure 4 shows a time course of a metering factor, according to a
  • Figure 5 shows a time course of a metering factor, according to another embodiment of the method according to the invention.
  • a metering valve meters a reducing agent in a metering module upstream of an S CR catalyst, on the surface of which nitrogen oxides, by means of ammonia liberated from the urea-water solution, are converted into elemental nitrogen (not shown).
  • a nitrogen oxide conversion rate NOxKonvert which indicates how much nitrogen oxide is converted, is dependent on an ammonia level FN H3 of the S CR catalyst and thus on the metered ammonia mass mN H3.
  • NOxKonvert is NOxKonvert over the ammonia level FNhta at a filling 100 and an emptying 101 of the S CR catalyst, according to one embodiment of a conventional one
  • a nominal value 102 for the ammonia level FN H3 is entered in the diagram and represents the optimum ammonia filling compound FN H3, in which the S CR catalyst is optimally operated in this exemplary embodiment.
  • a buffer region 103 with respect to nitrogen oxide peaks which is intended to compensate for a suddenly occurring excessive nitrogen oxide mass
  • a buffer region 104 with respect to an ammonia slip 105 in which ammonia unused passes through the catalyst surface, are entered around the desired value 102.
  • An ammonia mass m N H3, which is measured at said ammonia slip 105 downstream of the S CR catalyst, is also shown above the ammonia level FN H3.
  • ammonia mass mN H3 with a urea mass mChUIN O corresponds to the reducing agent, it depends on a quality Q of the reducing agent, wherein the quality Q represents a quotient of the mass of urea m CH N20 and the total mass m ge £ of the reducing agent:
  • FIG. 2 shows a flow chart according to an embodiment of the invention
  • the S CR catalyst is set to a predetermined high nitrogen oxide conversion rate NOxKonvert 200.
  • a query 201 is started if there is no relevant system error 202, all nitric oxide sensors used for the measurement are ready to measure 203, the dosing module 204 is active and the metered amount of reducing agent, for example by concurrent methods, is not limited 205. If all operating parameters are met, a measured actual ammonia mass flow is integrated into an actual ammonia mass mNHslst by means of an I regulator 206, the latter being opened over an opening time t open and a
  • Opening frequency föff the metering valve is estimated.
  • c NOx is a nitrogen oxide concentration upstream of the SCR catalyst
  • rh Ab an exhaust gas mass flow in the exhaust line
  • ⁇ ⁇ a modeled nitrogen oxide efficiency of the S CR catalyst
  • f stöch a stoichiometric factor.
  • the stoichiometric factor f stöch gives that
  • Ratio of the ammonia mass mNH3 to the nitrogen oxide mass mNOx A molar mass M NO ⁇ of nitrogen dioxide corresponds approximately to an effective molar mass M NO of the nitrogen oxides present in the exhaust gas.
  • Amount of nitrogen dioxide corresponds to N0 ⁇ and consequently the stoichiometric factor f stöch corresponds to a ratio of the molar masses M NH ⁇ of
  • a metering factor facDos is calculated 209 as the quotient of the actual ammonia mass mNHslst and the modeled ammonia mass mNHsMod, according to formula 4.
  • the limiting mass mNHsGrenz was chosen at this point at 6 g.
  • the actual ammonia mass mNHslst exceeds the predetermined limit mass mNHslimit for a time t of approximately 22.5 minutes.
  • the I-controllers used in the integrations 206 and 207 are reset in a sibling step 210. It should be noted that these two integrations 206 and 207 run permanently, but the calculation 209 of the dosing factor facDos is done discretely.
  • the frequency of the calculation 209 of the dosing factor facDos is dependent on a duration until, in step 208, the limit mass mNhtaGrenz has been exceeded, that is to say 22.5 minutes.
  • the calculation 209 of the dosing factor facDos takes place via an exponential weighted moving average (EWMA) filter 211, which works on the basis of the formula 5.
  • EWMA exponential weighted moving average
  • S t indicates the value of the EWMA at the time t
  • Y t are the input raw values
  • a represents a sensitivity coefficient of the EWMA filter, wherein this is varied as a function of a time interval of a last night Nachankereignisses the reducing agent.
  • this is possible on the basis of an integrator, which detects a nitrogen oxide mass mNOx and is reset in the case of refueling.
  • the evaluation by the EWMA filter is activated on initial initialization and / or resetting only when enough raw values Y t have been recorded.
  • the dosing factor facDos represents a manipulated variable for a nitric oxide regulator. To obtain a lower quality Q of the reducing agent, the predetermined high
  • the nitrogen oxide regulator must increase the ammonia filler mass FN H3 (see FIG. 1) by increasing the metered reducing agent mass. In other words, to achieve the same NOx conversion rate, NOxConvert is higher
  • a further step 212 it is checked whether the dosing factor facDos, as shown in Figure 4, has exceeded a first threshold 311. This takes place at marked point 312 at approx. 25 minutes.
  • a first threshold 311 This takes place at marked point 312 at approx. 25 minutes.
  • FIG. 2 it is subsequently provided to generate an error state in the system 213, which attributes a poor quality Q to the reductant solution and then creates a fault memory entry 214.
  • a decreasing metering factor facDos is further provided, which corresponds to an improvement in the quality Q, e.g. by replacing the reducing agent. It is checked in an additional step 215 whether the dosing factor facDos, as shown in Figure 5, has fallen below a second threshold 321. This takes place at the marked point 322 at approx. 70 minutes. Now, as shown in the flowchart of Figure 2, the error state is removed 216.

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)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

L'invention concerne un procédé pour contrôler la qualité d'une solution d'agent de réduction destinée à un catalyseur RCS qui comprend un régulateur de NOx. Le procédé consiste dans un premier temps à régler le catalyseur RCS à un taux de conversion de Nox prédéterminé. Le procédé consiste dans un deuxième temps à intégrer un flux massique d'ammoniac réel dans une masse d'ammoniac réelle et à intégrer un flux massique d'ammoniac modélisé dans une masse d'ammoniac modélisée. Le procédé consiste ensuite à calculer un facteur de masse de dosage en tant que quotient de la masse d'ammoniac réelle et de la masse d'ammoniac modélisée et enfin, lorsque le facteur de masse de dosage (facDos) a dépassé un premier seuil déterminé (311) (au point 312), à générer un état d'erreur qui attribue une mauvaise qualité à la solution d'agent de réduction.
EP17732885.3A 2016-08-24 2017-06-23 Procédé pour contrôler la qualité d'une solution d'agent de réduction dans un catalyseur rcs Withdrawn EP3504407A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016215864.3A DE102016215864A1 (de) 2016-08-24 2016-08-24 Verfahren zur Qualitätskontrolle einer Reduktionsmittellösung in einem SCR-Katalysator
PCT/EP2017/065487 WO2018036686A1 (fr) 2016-08-24 2017-06-23 Procédé pour contrôler la qualité d'une solution d'agent de réduction dans un catalyseur rcs

Publications (1)

Publication Number Publication Date
EP3504407A1 true EP3504407A1 (fr) 2019-07-03

Family

ID=59215773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17732885.3A Withdrawn EP3504407A1 (fr) 2016-08-24 2017-06-23 Procédé pour contrôler la qualité d'une solution d'agent de réduction dans un catalyseur rcs

Country Status (5)

Country Link
EP (1) EP3504407A1 (fr)
KR (1) KR20190038929A (fr)
CN (1) CN109642485B (fr)
DE (1) DE102016215864A1 (fr)
WO (1) WO2018036686A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111120055B (zh) * 2019-12-31 2021-11-19 潍柴动力股份有限公司 一种发动机尿素浓度变化检测方法、装置及存储介质
CN112112716B (zh) * 2020-09-28 2022-05-17 无锡威孚力达催化净化器有限责任公司 一种scr系统尿素溶液浓度异常的诊断方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19944009A1 (de) * 1999-09-14 2001-03-22 Siemens Ag Verfahren zum Betrieb eines SCR-Katalysators
DE102006021988B4 (de) * 2006-05-11 2020-04-16 Robert Bosch Gmbh Verfahren und Vorrichtung zur Dosierung eines Reduktionsmittels in einer Abgasreinigungsanlage
DE102006055235A1 (de) 2006-11-23 2008-05-29 Robert Bosch Gmbh Verfahren zur Erkennung der Qualität einer Harnstoff-Wasser-Lösung
DE102007022594A1 (de) * 2007-05-14 2008-11-27 Robert Bosch Gmbh Diagnoseverfahren für ein in einen Abgasbereich einer Brennkraftmaschine einzubringendes Reagenzmittel und Vorrichtung zur Durchführung des Verfahrens
US8596042B2 (en) * 2008-08-28 2013-12-03 Delphi International Operations Luxembourg S.A.R.L. System and method for selective catalytic reduction control
DE102010002620A1 (de) 2010-03-05 2011-09-08 Robert Bosch Gmbh Verfahren zum Betreiben eines SCR-Katalysators
DE102011114700B4 (de) * 2010-10-06 2019-12-19 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Verfahren zur Detektion von Reduktionsmittel mit geringer Qualität und von Katalysatordegradation in Systemen für selektive katalytische Reduktion
US8495862B2 (en) * 2010-10-06 2013-07-30 GM Global Technology Operations LLC System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems
DE102012209240A1 (de) 2012-05-31 2013-12-05 Robert Bosch Gmbh Verfahren zur Plausibilisierung einer Messvorrichtung zur Ermittlung einer Qualität einer Harnstoffwasserlösung in einem Behälter eines SCR-Katalysatorsystems
DE102012221574A1 (de) 2012-07-31 2014-02-06 Robert Bosch Gmbh Verfahren zum Betreiben eines zur Nachbehandlung von Abgasen einer Brennkraftmaschine vorgesehenen SCR-Katalysators
CN105283642B (zh) * 2013-06-10 2018-03-09 博世株式会社 控制装置、内燃机的排气净化装置及排气净化装置的控制方法
US9050561B1 (en) * 2014-03-26 2015-06-09 GM Global Technology Operations LLC Reductant quality system including rationality diagnostic
DE102014211010A1 (de) 2014-06-10 2015-12-17 Robert Bosch Gmbh Verfahren zur Kalibrierung eines HWL-Qualitätssensors

Also Published As

Publication number Publication date
DE102016215864A1 (de) 2018-03-01
CN109642485B (zh) 2021-06-29
KR20190038929A (ko) 2019-04-09
CN109642485A (zh) 2019-04-16
WO2018036686A1 (fr) 2018-03-01

Similar Documents

Publication Publication Date Title
DE112011100874B4 (de) Steuersystem zur Dosiererkompensation in einem SCR-System
EP1926894B1 (fr) Procede de fonctionnement d'un moteur a combustion interne et dispositif pour mettre en oeuvre ledit procede
DE102010060099A1 (de) Verfahren zum Anpassen eines SCR Katalysators in einem Abgassystem eines Kraftfahrzeugs
DE102020205025A1 (de) Verfahren zur Überwachung eines SCR-Katalysators
EP3717757A1 (fr) Procédé pour faire fonctionner une installation de retraitement des gaz d'échappement d'un moteur à combustion interne et installation de retraitement des gaz d'échappement
DE102015222209A1 (de) Verfahren zur Plausibilisierung eines NOx-Sensors in einem SCR-Katalysatorsystem
DE102012201749A1 (de) Verfahren zur Überwachung eines SCR-Katalysators
DE102009058089A1 (de) Bestimmung des linearen Zusammenhangs zweier mittels NOx-Sensoren bestimmter Signale in einem SCR-Abgasnachbehandlungssystem
DE102008041603A1 (de) Verfahren zum Betreiben einer Brennkraftmaschine mit SCR-Katalysator
DE102016211575A1 (de) Fehlererkennung in einem SCR-System mittels eines Ammoniak-Füllstands
DE102013203580A1 (de) Verfahren zur Überwachung eines Abgasnachbehandlungssystems
DE102011108019A1 (de) Verfahren zur Ermittlung einer Qualität einer zur Stickoxidverminderung eingesetzten, Ammoniak enthaltenden Reduktionsmittellösung
DE102012202671A1 (de) Verfahren zur Diagnose eines SCR-Katalysatorsystems
DE102012220151A1 (de) Verfahren zur Überprüfung eines Ammoniaksensors oder eines NH3-querempfindlichen Sensors
DE102017210250A1 (de) Verfahren zur Erkennung einer Fehldosierung
DE102011085952A1 (de) SCR-Katalysatorsystem und Verfahren zu seinem Betrieb
DE102017204301A1 (de) Verfahren zur Korrektur eines Offsets eines Ammoniak-Sensors
DE102008040377A1 (de) Verfahren zum Dosieren eines Reagenzmittels und Vorrichtung zur Durchführung des Verfahrens
DE102007022594A1 (de) Diagnoseverfahren für ein in einen Abgasbereich einer Brennkraftmaschine einzubringendes Reagenzmittel und Vorrichtung zur Durchführung des Verfahrens
DE102017201393A1 (de) Verfahren zur Fehlererkennung in einem SCR-System mittels eines Ammoniak-Schlupfs
DE102015207670A1 (de) Verfahren zur Überwachung eines SCR-Katalysators
WO2018036686A1 (fr) Procédé pour contrôler la qualité d'une solution d'agent de réduction dans un catalyseur rcs
DE112015000328T5 (de) Verfahren und System zum Zuführen von Additiv zu einem Abgasstrom
DE102016211572A1 (de) Fehlererkennung in einem SCR-System mittels Wirkungsgrad
WO2017005347A1 (fr) Procédé de fonctionnement d'un système de post-traitement des gaz d'échappement disposant d'un catalyseur scr

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20190325

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ROBERT BOSCH GMBH

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20210716

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20211127