WO2018036686A1 - 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 Download PDF

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Publication number
WO2018036686A1
WO2018036686A1 PCT/EP2017/065487 EP2017065487W WO2018036686A1 WO 2018036686 A1 WO2018036686 A1 WO 2018036686A1 EP 2017065487 W EP2017065487 W EP 2017065487W WO 2018036686 A1 WO2018036686 A1 WO 2018036686A1
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WO
WIPO (PCT)
Prior art keywords
mass
ammonia mass
ammonia
modeled
reducing agent
Prior art date
Application number
PCT/EP2017/065487
Other languages
German (de)
English (en)
Inventor
Christian Heimann
Tobias Pfister
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
Priority to EP17732885.3A priority Critical patent/EP3504407A1/fr
Priority to CN201780051768.3A priority patent/CN109642485B/zh
Priority to KR1020197008229A priority patent/KR20190038929A/ko
Publication of WO2018036686A1 publication Critical patent/WO2018036686A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
  • 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
  • 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
  • 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.
  • 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 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.
  • 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.
  • 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.

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  • 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.
PCT/EP2017/065487 2016-08-24 2017-06-23 Procédé pour contrôler la qualité d'une solution d'agent de réduction dans un catalyseur rcs WO2018036686A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP17732885.3A EP3504407A1 (fr) 2016-08-24 2017-06-23 Procédé pour contrôler la qualité d'une solution d'agent de réduction dans un catalyseur rcs
CN201780051768.3A CN109642485B (zh) 2016-08-24 2017-06-23 用于scr催化器中还原剂溶液的品质控制的方法
KR1020197008229A KR20190038929A (ko) 2016-08-24 2017-06-23 Scr 촉매 컨버터에서 환원제 용액의 품질 제어 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016215864.3 2016-08-24
DE102016215864.3A DE102016215864A1 (de) 2016-08-24 2016-08-24 Verfahren zur Qualitätskontrolle einer Reduktionsmittellösung in einem SCR-Katalysator

Publications (1)

Publication Number Publication Date
WO2018036686A1 true WO2018036686A1 (fr) 2018-03-01

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

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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

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WO2001019499A1 (fr) * 1999-09-14 2001-03-22 Siemens Aktiengesellschaft Procede pour faire fonctionner un catalyseur de reduction catalytique selective
DE102006021988A1 (de) * 2006-05-11 2007-11-15 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
DE102010002620A1 (de) 2010-03-05 2011-09-08 Robert Bosch Gmbh Verfahren zum Betreiben eines SCR-Katalysators
DE102011114700A1 (de) * 2010-10-06 2012-04-12 Gm Global Technology Operations Llc, ( N.D. Ges. D. Staates Delaware) System und Verfahren zur Detektion von Reduktionsmittel mit geringer Qualität und von Katalysatordegradation in Systemen für selektive katalytische Reduktion
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
DE102014211010A1 (de) 2014-06-10 2015-12-17 Robert Bosch Gmbh Verfahren zur Kalibrierung eines HWL-Qualitätssensors
EP3009622A1 (fr) * 2013-06-10 2016-04-20 Bosch Corporation Dispositif de commande, dispositif de purification d'échappement pour moteur à combustion interne, et procédé de commande de dispositif de purification d'échappement

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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
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
US9050561B1 (en) * 2014-03-26 2015-06-09 GM Global Technology Operations LLC Reductant quality system including rationality diagnostic

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Publication number Priority date Publication date Assignee Title
WO2001019499A1 (fr) * 1999-09-14 2001-03-22 Siemens Aktiengesellschaft Procede pour faire fonctionner un catalyseur de reduction catalytique selective
DE102006021988A1 (de) * 2006-05-11 2007-11-15 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
DE102010002620A1 (de) 2010-03-05 2011-09-08 Robert Bosch Gmbh Verfahren zum Betreiben eines SCR-Katalysators
DE102011114700A1 (de) * 2010-10-06 2012-04-12 Gm Global Technology Operations Llc, ( N.D. Ges. D. Staates Delaware) System und Verfahren zur Detektion von Reduktionsmittel mit geringer Qualität und von Katalysatordegradation in Systemen für selektive katalytische Reduktion
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
EP3009622A1 (fr) * 2013-06-10 2016-04-20 Bosch Corporation Dispositif de commande, dispositif de purification d'échappement pour moteur à combustion interne, et procédé de commande de dispositif de purification d'échappement
DE102014211010A1 (de) 2014-06-10 2015-12-17 Robert Bosch Gmbh Verfahren zur Kalibrierung eines HWL-Qualitätssensors

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Publication number Publication date
CN109642485B (zh) 2021-06-29
KR20190038929A (ko) 2019-04-09
CN109642485A (zh) 2019-04-16
EP3504407A1 (fr) 2019-07-03
DE102016215864A1 (de) 2018-03-01

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