DE102018110214A1 - Method for detecting the condition of a high-frequency antenna for an SCR catalytic converter - Google Patents
Method for detecting the condition of a high-frequency antenna for an SCR catalytic converter Download PDFInfo
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- DE102018110214A1 DE102018110214A1 DE102018110214.3A DE102018110214A DE102018110214A1 DE 102018110214 A1 DE102018110214 A1 DE 102018110214A1 DE 102018110214 A DE102018110214 A DE 102018110214A DE 102018110214 A1 DE102018110214 A1 DE 102018110214A1
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- frequency antenna
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- catalytic converter
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Classifications
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/028—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting humidity or water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/12—Other sensor principles, e.g. using electro conductivity of substrate or radio frequency
-
- 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]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2822—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere of microwave or radiofrequency circuits
-
- 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)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zur Funktionszustandserkennung einer Hochfrequenz-Antenne für einen SCR-Katalysator.Erfindungsgemäß wird während eines normalen/laufenden Betriebs eines Verbrennungsmotors ein zeitlicher Verlauf eines Signalbildes der Hochfrequenz-Antenne und ein zeitlicher Verlauf eines Lambda-Sensors und/oder eines Temperatur-Sensors und/oder Feuchte-Sensors des SCR-Katalysators erfasst.Die Änderungen des Lambda-Sensors und/oder Temperatur-Sensors und/oder Feuchte-Sensors werden mit den Änderungen des Signalbildes verglichen.Aufgrund des Vergleichs wird der Funktionszustand der Hochfrequenz-Antenne erkannt.The invention relates to a method for detecting the functional state of a high-frequency antenna for an SCR catalytic converter. According to the invention, during a normal / ongoing operation of an internal combustion engine, a time profile of a signal image of the high-frequency antenna and a time profile of a lambda sensor and / or a temperature sensor The changes of the lambda sensor and / or temperature sensor and / or humidity sensor are compared with the changes of the signal image. Due to the comparison, the functional state of the high-frequency antenna is detected ,
Description
Technisches GebietTechnical area
Die Erfindung betrifft ein Verfahren zur Funktionszustandserkennung einer Hochfrequenz (HF)-Antenne gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for detecting the functional state of a radio frequency (RF) antenna according to the preamble of claim 1.
Mittels einer Hochfrequenz-Antenne kann der Zustand eines SCR (selctive catalytic reduction) -Katalysators gemessen werden.
Hiermit lassen sich u.a. Defekte an der Oberfläche, einer Beladung mit Wasser, Ammoniak (NH3) und anderen eingelagerten Stoffen, Beschichtungen (beispielsweise fehlende Schlupf-Katalysator-Beschichtung), Fehlen des Monolithen, Defekte an der Hülle, Alterung und alles andere erkennen, was die elektromagnetischen Eigenschaften des Resonators (Gesamtheit aller Geometrien und Materialien/Stoffe, die Einfluss auf die Ausbreitung der elektromagnetischen Wellen haben) verändert.
Die HF-Antenne ermittelt die Veränderung der Resonanzfrequenzen und wertet dabei Verschiebungen in der jeweiligen Frequenz und die zugehörige Amplituden-Dämpfung aus.By means of a high-frequency antenna, the state of a SCR (selective catalytic reduction) catalyst can be measured.
These include surface defects, water, ammonia (NH3) and other embedded materials, coatings (for example, lack of slip-catalyst coating), absence of monolith, defects in the shell, aging, and anything else changes the electromagnetic properties of the resonator (totality of all geometries and materials / substances that influence the propagation of electromagnetic waves).
The RF antenna detects the change in the resonance frequencies and evaluates shifts in the respective frequency and the associated amplitude attenuation.
Stand der TechnikState of the art
Aus der
Bei einer im Innenraum des als Hohlraumresonator ausgebildeten Gehäuses des Katalysators erzeugten Mikrowelle wird die Verschiebung der Resonanzfrequenz und/oder Resonanzgüte als Maß für die Gasbeladung des Speichermaterials bestimmt und ausgewertet.From the
In a microwave generated in the interior of the housing designed as a cavity resonator microwave, the shift of the resonant frequency and / or resonance quality is determined and evaluated as a measure of the gas loading of the storage material.
Die
Eine Betriebsgröße der Verbrennungskraftmaschine und/oder des Katalysatorsystems, welche die Stickoxidkonzentration des Abgases beeinflusst, wird periodisch geändert.
Eine ungenügende Dynamikempfindlichkeit des Ammoniaksensors oder des NH3-querempfindlichen Sensors wird erkannt, wenn die periodische Änderung der Betriebsgröße nicht zu einer periodischen Änderung des Signals des Ammoniaksensors oder des NH3-querempfindlkichen Sensors führt.The
An operation amount of the internal combustion engine and / or the catalyst system, which influences the nitrogen oxide concentration of the exhaust gas, is periodically changed.
Insufficient dynamic sensitivity of the ammonia sensor or the NH3 cross-sensitive sensor is recognized if the periodic change in operating magnitude does not result in a periodic change in the signal of the ammonia sensor or the NH3 cross-sensing sensor.
In der
Es werden Messungen in mehreren Frequenzbereichen eingesetzt und in diesen Bereichen Messgrößen bestimmt, um mit einer Messeinrichtung Rückschlüsse auf den Speicherzustand unter der Berücksichtigung von Quereinflüssen zu ermöglichen.In the
Measurements are used in several frequency ranges and measured quantities are determined in these ranges in order to allow conclusions to be drawn with regard to the storage state taking into account lateral influences.
Aufgabe der ErfindungObject of the invention
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, welches eine Funktionszustandserkennung der Hochfrequenz-Antenne während eines laufenden/normalen Betriebs des Motors und damit verbundenen dynamischen Anteilen auch im Bereich der Abgasnachbehandlung ermöglicht.The invention has for its object to provide a method which allows a functional state detection of the high-frequency antenna during a current / normal operation of the engine and associated dynamic shares in the field of exhaust aftertreatment.
Lösung der AufgabeSolution of the task
Die Erfindung wird durch ein Verfahren gemäß Anspruch 1 gelöst.The invention is solved by a method according to claim 1.
Vorteile der ErfindungAdvantages of the invention
Mittels des erfindungsgemäßen Verfahrens werden während eines laufenden/normalen Betriebs des Verbrennungsmotors ein zeitlicher Verlauf eines Signalbilds (Frequenz und/oder Amplitude) der Hochfrequenz-Antenne sowie ein zeitlicher Verlauf mindestens eines Lambda-Sensors, beispielsweise Breitbandlambdasonde, und/oder mindestens eines Temperatur-Sensors und/oder Feuchte-Sensors des SCR-Katalysators erfasst.
Die Änderungen bzw. charakteristischen Signalabschnitte des Lambda-Sensors und/oder Temperatur-Sensors und/oder Feuchte-Sensors werden mit den Änderungen des Signalbildes bzw. den Signalabschnitten verglichen.
Aufgrund des Vergleichs wird der Funktionszustand der Hochfrequenz-Antenne erkannt.By means of the method according to the invention during a running / normal operation of the internal combustion engine a time course of a signal image (frequency and / or amplitude) of the high-frequency antenna and a time course of at least one lambda sensor, for example broadband lambda probe, and / or at least one temperature sensor and / or humidity sensor of the SCR catalytic converter detected.
The changes or characteristic signal sections of the lambda sensor and / or temperature sensor and / or humidity sensor are compared with the changes of the signal image or the signal sections.
Due to the comparison, the functional state of the high-frequency antenna is detected.
In einer vorteilhaften Ausführungsform der Erfindung wird für den Vergleich mindestens ein modellierter Signalverlauf der Hochfrequenz-Antenne hinzugezogen.In an advantageous embodiment of the invention, at least one modeled signal profile of the high-frequency antenna is used for the comparison.
In einer weiteren vorteilhaften Ausführungsform der Erfindung wird für den Vergleich der erfasste Signalverlauf durch einen Hochpass gefiltert.In a further advantageous embodiment of the invention, the detected signal profile is filtered by a high-pass filter for the comparison.
Die erfindungsgemäße Funktionszustandserkennung, welche insbesondere notwendig für eine On-Board-Diagnose der Abgasnachbehandlung ist, der Hochfrequenz-Antenne verwendet Störsignale/Nutzsignale, die sich auf den Signalverlauf der Hochfrequenz-Antenne auswirken können.
Die Stör-/Nutzsignale treten bei einem laufenden/normalen Betrieb des Verbrennungsmotors auf und werden somit nicht „künstlich“ erzeugt.The functional state detection according to the invention, which is particularly necessary for an on-board diagnosis of the exhaust gas aftertreatment, the high-frequency antenna uses interference / useful signals that can affect the waveform of the high-frequency antenna.
The interference / useful signals occur during a running / normal operation of the internal combustion engine and are thus not generated "artificially".
Der Signalverlauf der Hochfrequenz-Antenne reagiert empfindlich und dynamisch auf Feuchtigkeitsänderungen im Abgas.
Die Feuchtigkeitsänderungen entstehen im laufenden Betrieb beim Dieselmotor durch Änderungen des Lastpunkts und damit einer Änderung von Lambda.
Der Grund ist die Verbrennung von Kraftstoff mit Wasser als Verbrennungsprodukt.
Die Feuchtigkeit lagert sich bei Lambda-Änderungen im SCR-Katalysator ein bzw. aus.
Da diese Änderungen vorhersehbar sind, lassen sie sich für die OBD des Sensors (HF-Antenne) nutzen.
Es wird beispielsweise bei einem Wechsel in den Schub (vom Gas gehen) ein definierter Sprung im HF-Signal erwartet, den man zur Überprüfung der Funktionsweise der HF-Antenne heranziehen kann.
Für die OBD wird der modellierte Signalverlauf (basierend auf einem Lambda-, Temperatur, und/oder Feuchtesignal) mit dem Signalbild der Hochfrequenz-Antenne durch ein geeignetes Mittel, beispielsweise ein Hochpass-Filter, verglichen.The signal path of the high-frequency antenna is sensitive and dynamic to changes in humidity in the exhaust gas.
The changes in humidity occur during operation in the diesel engine by changes in the load point and thus a change in lambda.
The reason is the combustion of fuel with water as a combustion product.
The moisture settles on lambda changes in the SCR catalyst on or off.
Because these changes are predictable, they can be used for the OBD of the sensor (RF antenna).
For example, a change in the thrust (going from the gas) is expected to result in a defined jump in the RF signal, which can be used to check the operation of the RF antenna.
For the OBD, the modeled waveform (based on a lambda, temperature, and / or humidity signal) is compared to the signal image of the radio frequency antenna by a suitable means, such as a high pass filter.
Ein weiteres Störsignal ist die große Feuchtigkeitseinlagerung durch kondensiertes Wasser in der Aufwärmphase des Motors und der Abgasanlage beim Kaltstart.
Der Wasserdampf im Abgas kondensiert dabei an den Katalysatoren in der Abgasanlage in größeren Menden und wird eingelagert.
Erst wenn das Abgas und die Katalysatoren soweit aufgewärmt sind, dass das Wasser verdunsten kann, wird dieses wieder ausgelagert.
Dieser Prozess ist abgeschlossen, wenn das kondensierte Wasser vollständig verdampft ist. Diese Ein- und Auslagerung des Wassers haben einen massiven Einfluss auf das Signalbild der HF-Antenne.
Es existieren Modelle im Steuergerät, die den Vorgang der Ein- und Auslagerung des Wassers abbilden.
Nutzbare Modelle sind beispielsweise Freigabe-Modelle der NOx-Sensoren (sofern stromabwärts des SCR-Katalysators noch ein NOx-Sensor verbaut wurde), in denen auch die restlose Verdampfung des Wassers im stromaufwärtigen Abschnitt der Abgasleitung zu berücksichtigen ist, oder aber Temperatur-Modelle des SCR-Katalysators, in denen ebenfalls die Kondensations- und Verdampfungsenthalpien zu berücksichtigen sind.Another disturbance signal is the large moisture storage by condensed water in the warm-up phase of the engine and the exhaust system during cold start.
The water vapor in the exhaust gas condenses on the catalysts in the exhaust system in larger mills and is stored.
Only when the exhaust gas and the catalysts are warmed up so far that the water can evaporate, this is outsourced again.
This process is complete when the condensed water is completely evaporated. This storage and retrieval of the water have a massive influence on the signal pattern of the RF antenna.
There are models in the control unit, which depict the process of storage and retrieval of the water.
Usable models are, for example, release models of the NOx sensors (if downstream of the SCR catalyst, a NOx sensor has been installed), in which the complete evaporation of water in the upstream section of the exhaust pipe is taken into account, or temperature models of the SCR catalysts, which also take into account the enthalpies of condensation and evaporation.
Sofern stromabwärts des SCR-Katalysators ein Temperatur-Sensor verbaut ist, so kann dieser alternativ die abgeschlossene Verdampfung des Wassers detektieren.
Diese kann genutzt werden, um das Signalbild der HF-Antenne mit einer Erwartung aus dem Modell zu vergleichen.
Für die OBD ist die Normalisierung des HF-Signals nach der Erwärmung zu überwachen.If downstream of the SCR catalyst, a temperature sensor is installed, it can alternatively detect the completed evaporation of the water.
This can be used to compare the signal image of the RF antenna with an expectation from the model.
For the OBD, the normalization of the RF signal after heating should be monitored.
Die Temperatur des SCR-Katalysators ist eine weitere Größe mit Einfluss auf das Signalbild der HF-Antenne.
Temperaturänderungen bei ansonsten gleichbleibenden Bedingungen erzeugen vorhersehbare Änderungen des Antennensignals.
Dabei kann das Signal der HF-Antenne für eine bestimmte Temperatur nur in einem bestimmten Signalband liegen.
Liegt das Signal außerhalb, gibt es einen Defekt in der Hochfrequenz-Antenne bzw. deren elektronischer Auswerteeinheit.
Die Temperaturabhängigkeit des Antennensignals kann für die OBD herangezogen werden. Für die OBD kann hier ausgenutzt werden, dass sich das Signal der HF-Antenne für eine bestimmte Temperatur des SCR-Katalysators innerhalb eines limitierten Bereichs befinden muss.The temperature of the SCR catalyst is another factor influencing the signal pattern of the RF antenna.
Temperature changes with otherwise constant conditions produce predictable changes in the antenna signal.
In this case, the signal of the RF antenna for a certain temperature can only be in a certain signal band.
If the signal is outside, there is a defect in the high-frequency antenna or its electronic evaluation unit.
The temperature dependence of the antenna signal can be used for the OBD. For the OBD, it can be used here that the signal of the HF antenna must be within a limited range for a specific temperature of the SCR catalytic converter.
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 10358495 B4 [0003]DE 10358495 B4 [0003]
- DE 102012220152 A1 [0004]DE 102012220152 A1 [0004]
- DE 102010034983 A1 [0005]DE 102010034983 A1 [0005]
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018110214.3A DE102018110214A1 (en) | 2018-04-27 | 2018-04-27 | Method for detecting the condition of a high-frequency antenna for an SCR catalytic converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018110214.3A DE102018110214A1 (en) | 2018-04-27 | 2018-04-27 | Method for detecting the condition of a high-frequency antenna for an SCR catalytic converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102018110214A1 true DE102018110214A1 (en) | 2019-04-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE102018110214.3A Ceased DE102018110214A1 (en) | 2018-04-27 | 2018-04-27 | Method for detecting the condition of a high-frequency antenna for an SCR catalytic converter |
Country Status (1)
| Country | Link |
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| DE (1) | DE102018110214A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095411A (en) * | 2022-07-06 | 2022-09-23 | 潍柴动力股份有限公司 | Detection method and device for removal of selective catalytic reduction carrier |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10358495B4 (en) | 2003-12-13 | 2011-10-06 | Ralf Moos | Method for detecting the state of a catalyst by means of microwaves |
| DE102010034983A1 (en) | 2010-08-20 | 2012-02-23 | Gerhard Fischerauer | Method for detecting current state of exhaust after-treatment system in e.g. motor car, involves determining measured variables in different frequency ranges to allow measuring device to provide conclusions about memory state |
| DE102012220152A1 (en) | 2012-11-06 | 2014-05-22 | Robert Bosch Gmbh | Method for examining ammonia sensor or ammonia cross-sensitive sensor, involves periodically changing operating parameter of internal combustion engine or catalyst system, which influences nitrogen oxide concentration of exhaust gas |
| US20170182447A1 (en) * | 2015-06-08 | 2017-06-29 | Cts Corporation | Radio Frequency Process Sensing, Control, and Diagnostics Network and System |
| DE102016217899A1 (en) * | 2016-09-19 | 2018-03-22 | Continental Automotive Gmbh | Method for operating a catalytic converter device in the motor vehicle |
-
2018
- 2018-04-27 DE DE102018110214.3A patent/DE102018110214A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10358495B4 (en) | 2003-12-13 | 2011-10-06 | Ralf Moos | Method for detecting the state of a catalyst by means of microwaves |
| DE102010034983A1 (en) | 2010-08-20 | 2012-02-23 | Gerhard Fischerauer | Method for detecting current state of exhaust after-treatment system in e.g. motor car, involves determining measured variables in different frequency ranges to allow measuring device to provide conclusions about memory state |
| DE102012220152A1 (en) | 2012-11-06 | 2014-05-22 | Robert Bosch Gmbh | Method for examining ammonia sensor or ammonia cross-sensitive sensor, involves periodically changing operating parameter of internal combustion engine or catalyst system, which influences nitrogen oxide concentration of exhaust gas |
| US20170182447A1 (en) * | 2015-06-08 | 2017-06-29 | Cts Corporation | Radio Frequency Process Sensing, Control, and Diagnostics Network and System |
| DE102016217899A1 (en) * | 2016-09-19 | 2018-03-22 | Continental Automotive Gmbh | Method for operating a catalytic converter device in the motor vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095411A (en) * | 2022-07-06 | 2022-09-23 | 潍柴动力股份有限公司 | Detection method and device for removal of selective catalytic reduction carrier |
| CN115095411B (en) * | 2022-07-06 | 2024-04-16 | 潍柴动力股份有限公司 | Detection method and device for removing selective catalytic reduction carrier |
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