DE102019131029A1 - Exhaust aftertreatment system with a heating device for heating a probe - Google Patents
Exhaust aftertreatment system with a heating device for heating a probe Download PDFInfo
- Publication number
- DE102019131029A1 DE102019131029A1 DE102019131029.6A DE102019131029A DE102019131029A1 DE 102019131029 A1 DE102019131029 A1 DE 102019131029A1 DE 102019131029 A DE102019131029 A DE 102019131029A DE 102019131029 A1 DE102019131029 A1 DE 102019131029A1
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- probe
- heating device
- heating
- exhaust gas
- upstream
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
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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
- 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
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F01N2560/20—Sensor having heating means
-
- 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
- F01N2900/1404—Exhaust gas temperature
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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
- 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
- F01N2900/1602—Temperature of exhaust gas apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
-
- 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
Abstract
Die Erfindung betrifft ein Abgasnachbehandlungssystem mit einer Heizvorrichtung zur Aufheizung einer Sonde in der Warmlaufphase oder bei Kaltstart.
Das erfindungsgemäße Abgasnachbehandlungssystem für einen Verbrennungsmotor, umfassend eine Abgasleitung (1), einen in der Abgasleitung (1) angeordneten NOx Speicherkatalysator (2), eine in der Abgasleitung (1) angeordnete Sonde (3) und eine in der Abgasleitung (1) angeordnete Heizvorrichtung (4), wobei die Heizvorrichtung (4) derart eingerichtet ist, dass die Sonde (3) in der Warmlaufphase oder bei Kaltstart aufgeheizt werden kann.
The invention relates to an exhaust gas aftertreatment system with a heating device for heating a probe in the warm-up phase or during a cold start.
The exhaust gas aftertreatment system according to the invention for an internal combustion engine, comprising an exhaust gas line (1), an NO x storage catalytic converter (2) arranged in the exhaust gas line (1), a probe (3) arranged in the exhaust gas line (1) and an arranged in the exhaust gas line (1) Heating device (4), the heating device (4) being set up in such a way that the probe (3) can be heated in the warm-up phase or during a cold start.
Description
Die Erfindung betrifft ein Abgasnachbehandlungssystem mit einer Heizvorrichtung zur Aufheizung einer Sonde in der Warmlaufphase oder bei Kaltstart.The invention relates to an exhaust gas aftertreatment system with a heating device for heating a probe in the warm-up phase or during a cold start.
Aus der
Das erfindungsgemäße Abgasnachbehandlungssystem für einen Verbrennungsmotor umfasst eine Abgasleitung, einen in der Abgasleitung angeordneten NOx Speicherkatalysator, eine in der Abgasleitung angeordnete Sonde und eine in der Abgasleitung angeordnete Heizvorrichtung. Die Heizvorrichtung ist derart eingerichtet, dass die Sonde in der Warmlaufphase oder bei Kaltstart aufgeheizt werden kann.The exhaust gas aftertreatment system according to the invention for an internal combustion engine comprises an exhaust gas line, an NO x storage catalytic converter arranged in the exhaust gas line, a probe arranged in the exhaust gas line and a heating device arranged in the exhaust gas line. The heating device is set up in such a way that the probe can be heated up in the warm-up phase or during a cold start.
In Verbrennungsmotoren, insbesondere Dieselmotoren und mager betriebenen Ottomotoren, werden NOx Speicherkatalysatoren eingesetzt, die eine Zwischenspeicherung von NOx Emissionen ermöglichen. In bestimmten Zeitabständen oder nach einer gewissen, gefahrenen Strecke muss der NOx Speicherkatalysator regeneriert werden. Die Regeneration erfolgt, indem der Verbrennungsmotor unterstöchiometrisch betrieben wird, so dass das Verbrennungsluftverhältnis λ kleiner eins ist. Um den Verbrennungsmotor unterstöchiometrisch zu betreiben, wird üblicherweise eine Lambdasonde eingesetzt, die stromauf des NOx Speicherkatalysators angeordnet ist. Die Lambdasonde bestimmt die Stöchiometrie und ermöglicht damit eine Verbrennungsregelung.In internal combustion engines, in particular diesel engines and lean-burn gasoline engines, NO x storage catalysts are used, which enable intermediate storage of NO x emissions. The NO x storage catalytic converter must be regenerated at certain time intervals or after a certain distance traveled. The regeneration takes place in that the internal combustion engine is operated sub-stoichiometrically, so that the combustion air ratio λ is less than one. In order to operate the internal combustion engine substoichiometrically, a lambda probe is usually used, which is arranged upstream of the NO x storage catalytic converter. The lambda sensor determines the stoichiometry and thus enables combustion control.
Vor dem Hintergrund zukünftiger Emissionsgesetzgebungen, die die zulässigen NOx Emissionen weiter limitieren, stellt sich die Herausforderung, dass der NOx Speicherkatalysator sehr früh nach Motorstart, beispielsweise bei Kaltstart oder in der Warmlaufphase, regeneriert werden muss. Ansonsten kann keine maximale Speicheraktivität des NOx Speicherkatalysators gewährleistet werden. Die Regeneration des NOx Speicherkatalysators kann aber nur gestartet werden, wenn die Lambdasonde einsatzbereit ist. Dafür muss die Lambdasonde ausreichend aufgeheizt sein. Dies geschieht zunächst passiv durch Wärmeeintrag vom heißen Abgas. Nur wenn der Taupunkt im Abgas überschritten ist, so dass das Abgas nicht mehr mit Wasserdampf gesättigt ist, kann die Lambdasonde aktiv aufgeheizt werden. Diese Aufheizung der Lambdasonde dauert allerdings mehrere Minuten, was hinsichtlich der zukünftigen Emissionsgesetzgebungen unvorteilhaft ist.Against the background of future emissions legislation, which further limits the permissible NO x emissions, the challenge arises that the NO x storage catalytic converter must be regenerated very early after the engine has started, for example during a cold start or in the warm-up phase. Otherwise no maximum storage activity of the NO x storage catalytic converter can be guaranteed. The regeneration of the NO x storage catalytic converter can only be started when the lambda sensor is ready for use. To do this, the lambda probe must be sufficiently heated. This is initially done passively by introducing heat from the hot exhaust gas. The lambda probe can only be actively heated if the dew point in the exhaust gas has been exceeded so that the exhaust gas is no longer saturated with water vapor. However, this heating of the lambda probe takes several minutes, which is disadvantageous with regard to future emissions legislation.
Die Erfindung ermöglicht eine sehr frühe Regeneration des NOx Speicherkatalysators, indem die Lamdasonde in einer vorteilhafteren Zeitspanne aufgeheizt werden kann, da die Heizvorrichtung unabhängig vom Taupunkt des Abgases bei Motorstart eingeschaltet werden kann. Bei Motorstart bedeutet innerhalb von 10 Sekunden nach Motorstart, bevorzugt innerhalb von 5 Sekunden nach Motorstart, besonders bevorzugt innerhalb von 2 Sekunden nach Motorstart.The invention enables a very early regeneration of the NO x storage catalytic converter in that the lambda probe can be heated up in a more advantageous time period since the heating device can be switched on independently of the dew point of the exhaust gas when the engine is started. When starting the engine means within 10 seconds after starting the engine, preferably within 5 seconds after starting the engine, particularly preferably within 2 seconds after starting the engine.
Eine vorteilhafte Ausführungsform der Erfindung sieht vor, dass die Heizvorrichtung als elektrische Heizung ausgeführt ist. Eine elektrische Heizung ist sehr gut regelbar, da Schaltvorgänge kaum Verzögerungen beinhalten. Aufgrund der separaten Stromversorgung, beispielsweis durch eine Batterie, ist sie zudem weitgehend unabhängig vom Betriebspunkt des Verbrennungsmotors einsetzbar.An advantageous embodiment of the invention provides that the heating device is designed as an electrical heater. An electric heater can be regulated very well, since switching operations hardly contain any delays. Due to the separate power supply, for example by a battery, it can also be used largely independently of the operating point of the internal combustion engine.
Vorzugsweise umfasst das erfindungsgemäße Abgasnachbehandlungssystem ein Steuergerät, das eingerichtet ist, die folgenden Schritte durchzuführen: Einschalten der Heizvorrichtung, Ermitteln des Taupunkts in der Abgasleitung stromauf der Sonde über einen Sensor, ein Modell oder ein Kennfeld und Ausschalten der Heizvorrichtung, wenn der Taupunkt in der Abgasleitung stromauf der Sonde überschritten ist. Mögliche Vorteile dieser Ausführungsform sind eine Aufheizung der Sonde innerhalb einer Zeitspanne und dadurch die Möglichkeit einer möglichst frühen Regeneration des NOx Speicherkatalysators, was für die Einhaltung zukünftiger Emissionsgesetzgebungen vorteilhaft ist. Vorteilhaft ist eine Zeitspanne für die Aufheizung von weniger als 90 Sekunden, besonders vorteilhaft von weniger als 60 Sekunden.The exhaust gas aftertreatment system according to the invention preferably comprises a control unit which is set up to carry out the following steps: switching on the heating device, determining the dew point in the exhaust gas line upstream of the probe via a sensor, a model or a map and switching off the heating device when the dew point in the exhaust gas line upstream of the probe is exceeded. Possible advantages of this embodiment are heating the probe within a period of time and thereby the possibility of regeneration of the NO x storage catalytic converter as early as possible, which is advantageous for compliance with future emission legislation. A period of time for heating up of less than 90 seconds is advantageous, particularly advantageously less than 60 seconds.
Die abhängigen Ansprüche beschreiben weitere vorteilhafte Ausführungsformen der Erfindung.The dependent claims describe further advantageous embodiments of the invention.
Bevorzugte Ausführungsbeispiele werden anhand der folgenden Figuren näher erläutert. Dabei zeigt
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1 ein erfindungsgemäßes Abgasnachbehandlungssystem, wobei die Heizvorrichtung den gesamten Querschnitt der Abgasleitung abdeckt, -
2 ein erfindungsgemäßes Abgasnachbehandlungssystem, wobei die Heizvorrichtung nur einen Teil des Querschnitts der Abgasleitung abdeckt, -
3 ein erfindungsgemäßes Verfahren für die Aufheizung einer Sonde in einem Abgasnachbehandlungssystem.
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1 an exhaust gas aftertreatment system according to the invention, the heating device covering the entire cross section of the exhaust pipe, -
2 an exhaust gas aftertreatment system according to the invention, the heating device covering only part of the cross section of the exhaust gas line, -
3 an inventive method for heating a probe in an exhaust gas aftertreatment system.
In diesem Ausführungsbeispiel ist die Heizvorrichtung
Alternativ können für die Heizvorrichtung
Hier deckt die Heizvorrichtung
In diesem Ausführungsbeispiel ist die Heizvorrichtung
Als Sonde
In diesem Ausführungsbeispiel umfasst die erfindungsgemäße Vorrichtung ein Steuergerät. Dieses ist eingerichtet, die in
Das Steuergerät ist hier derart eingerichtet, die Heizvorrichtung
In einem weiteren Ausführungsbeispiel (nicht gezeigt) ist das Steuergerät ausgebildet, die Heizvorrichtung einzuschalten, wenn erkannt wird, dass eine Regeneration zu einem Zeitpunkt erforderlich wird und bis zu diesem Zeitpunkt der Taupunkt in der Abgasleitung
Das Steuergerät ist weiterhin eingerichtet, die Heizvorrichtung abzuschalten, wenn der Taupunkt in der Abgasleitung
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 documents listed by the applicant has been generated automatically and is only included 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 PatentliteraturPatent literature cited
- DE 102008011834 B4 [0002]DE 102008011834 B4 [0002]
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102018129684.3 | 2018-11-26 | ||
DE102018129684.3A DE102018129684A1 (en) | 2018-11-26 | 2018-11-26 | Exhaust after-treatment system with a heater for heating a probe |
Publications (1)
Publication Number | Publication Date |
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DE102019131029A1 true DE102019131029A1 (en) | 2020-01-09 |
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Application Number | Title | Priority Date | Filing Date |
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DE102018129684.3A Withdrawn DE102018129684A1 (en) | 2018-11-26 | 2018-11-26 | Exhaust after-treatment system with a heater for heating a probe |
DE102019131029.6A Pending DE102019131029A1 (en) | 2018-11-26 | 2019-11-18 | Exhaust aftertreatment system with a heating device for heating a probe |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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DE102018129684.3A Withdrawn DE102018129684A1 (en) | 2018-11-26 | 2018-11-26 | Exhaust after-treatment system with a heater for heating a probe |
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DE (2) | DE102018129684A1 (en) |
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DE102020100532A1 (en) * | 2020-01-13 | 2021-07-15 | Volkswagen Aktiengesellschaft | Method for heating up an exhaust gas sensor in the exhaust system of an internal combustion engine |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102008011834B4 (en) | 2008-02-27 | 2017-09-21 | Volkswagen Ag | Method for operating a lambda probe |
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2018
- 2018-11-26 DE DE102018129684.3A patent/DE102018129684A1/en not_active Withdrawn
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2019
- 2019-11-18 DE DE102019131029.6A patent/DE102019131029A1/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102008011834B4 (en) | 2008-02-27 | 2017-09-21 | Volkswagen Ag | Method for operating a lambda probe |
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