DE4133117A1 - Decontamination of combustion engine exhaust gases - preheating catalyser, e.g. by feeding secondary air or electrical heating, according to its ageing state and downstream temp. - Google Patents

Decontamination of combustion engine exhaust gases - preheating catalyser, e.g. by feeding secondary air or electrical heating, according to its ageing state and downstream temp.

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Publication number
DE4133117A1
DE4133117A1 DE4133117A DE4133117A DE4133117A1 DE 4133117 A1 DE4133117 A1 DE 4133117A1 DE 4133117 A DE4133117 A DE 4133117A DE 4133117 A DE4133117 A DE 4133117A DE 4133117 A1 DE4133117 A1 DE 4133117A1
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Germany
Prior art keywords
preheating
aging
catalyst
catalyser
secondary air
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Granted
Application number
DE4133117A
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German (de)
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DE4133117C2 (en
Inventor
Murat Dipl Ing Serifsoy
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Audi AG
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Audi AG
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Priority to DE4133117A priority Critical patent/DE4133117C2/en
Publication of DE4133117A1 publication Critical patent/DE4133117A1/en
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Publication of DE4133117C2 publication Critical patent/DE4133117C2/en
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Expired - Fee Related legal-status Critical Current

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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
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • 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
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/02—Catalytic activity of catalytic converters
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The method involves using at least one catalyser (14) in the exhaust gas system which is pre-heated by introducing secondary air into the exhaust gas and/or by heating electrically. The pre-heating process is adapted to the state of ageing of the catalyser. It is intensified as the age of the catalyser increases and is controlled according to the temp. (TK) downstream of the catalyser. USE/ADVANTAGE - E.g. for vehicle. Achieves further improvement in exhaust gas decontamination at low additional cost.

Description

Die Erfindung betrifft ein Verfahren zur Abgasentgiftung von Brennkraftmaschinen, gemäß dem Oberbegriff des Pa­ tentanspruches 1.The invention relates to a method for exhaust gas detoxification of internal combustion engines, according to the preamble of Pa claim 1.

Im Rahmen der immer strengeren Normen zur Abgasentgif­ tung für Brennkraftmaschinen ist es bekannt, durch Zu­ führung von Sekundärluft (und ggf. zusätzlichem Brenn­ stoff) und/oder durch elektrische Beheizung den in der Abgasleitung angeordneten Katalysator (z. B. Drei-Wege­ Katalysator) vorzuwärmen bzw. möglichst schnell auf seine Anspringtemperatur zu bringen, um eine wirkungs­ volle Konvertierung der schädlichen Abgasbestandteile einzuleiten. Die Vorwärmung kann dabei abhängig von der Brennkraftmaschinen-Temperatur, der Katalysatortempera­ tur oder der Temperatur einer ebenfalls beheizten Lamb­ da-Sonde zur Einregelung des Kraftstoff-Luft-Gemisches der Brennkraftmaschine gesteuert werden.As part of the increasingly strict standards for exhaust gas detoxification tion for internal combustion engines, it is known by Zu management of secondary air (and possibly additional combustion fabric) and / or by electrical heating in the Exhaust pipe arranged catalyst (e.g. three-way Preheat catalyst or as soon as possible bring its light-off temperature to an effective full conversion of harmful exhaust gas components initiate. The preheating can depend on the Internal combustion engine temperature, the catalyst temperature ture or the temperature of a likewise heated Lamb da probe for regulating the fuel-air mixture the internal combustion engine can be controlled.

Aufgabe der Erfindung ist es, ein Verfahren anzugeben, mit dem bei geringem zusätzlichen Aufwand die vorbe­ schriebene Abgasentgiftung weiter verbessert werden kann.The object of the invention is to provide a method with the vorbe with little additional effort written exhaust gas detoxification can be further improved can.

Diese Aufgabe wird erfindungsgemäß mit den kennzeichnen­ den Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind den weiteren Pa­ tentansprüchen entnehmbar. According to the invention, this object is characterized by the solved the features of claim 1. Beneficial Further developments of the invention are the further Pa claims can be removed.  

Der erfindungsgemäße Vorschlag beinhaltet somit, die Vorwärmung eines oder mehrerer Katalysatoren im Abgassy­ stem der Brennkraftmaschine auch abhängig von deren Al­ terung zu steuern, insbesondere den Grad der Vorwärmung mit zunehmender Alterung anzuheben. Damit ist sicherge­ stellt, daß auch Katalysatoren mit einer bereits länge­ ren Betriebszeit schnell und zuverlässig ihre Anspring­ temperatur erreichen und ggf. halten, so daß die Abgas­ entgiftung insgesamt verbessert ist. Dadurch kann bei­ spielsweise bei neuen Katalysatoren eine relativ nied­ rige Anspringtemperatur bzw. Vorwärmtemperatur oder -zeit eingestellt werden, die dann über die Betriebszeit entsprechend dem Alterungszustand angehoben wird. Glei­ ches gilt für eine ggf. eingesetzte Sekundärluftzu­ führung.The proposal according to the invention thus includes the Preheating one or more catalysts in the exhaust gas stem of the internal combustion engine also depending on its Al control, especially the degree of preheating increase with increasing aging. This is certain represents that even catalysts with a length operating times quickly and reliably reach temperature and if necessary keep it so that the exhaust gas detoxification is improved overall. This can help for example, a relatively low for new catalysts high starting temperature or preheating temperature or -time can be set, which then over the operating time is raised according to the state of aging. Same This applies to any secondary air supply that may be used guide.

Der Alterungszustand des Katalysators kann entweder ge­ stützt auf empirische Ermittlungen über die Getriebszeit der Brennkraftmaschine, bei Verwendung in einem Kraft­ fahrzeug über dessen Wegstrecke oder beispielsweise bei Verwendung eines Bordcomputers über dessen insgesamten Kraftstoffverbrauch (dadurch kann auch das Lastkollektiv berücksichtigt werden) erfaßt werden. Bevorzugt wird je­ doch vorgeschlagen, am Katalysator oder stromab des Ka­ talysators eine weitere, die Abgaszusammensetzung erfas­ sende Sonde, insbesondere eine Sambda-Sonde vorzusehen. Durch die Auswertung der Signale der beiden τ-Sonden bzw. durch vergleichende Messungen deren Innenwider­ standswerte können der Alterungszustand des Katalysators erfaßt und die Steuerparameter für die Vorwärmung und Beheizung entsprechend angepaßt werden. Dies kann durch eine adaptive Steuerung bewerkstelligt werden, die den jeweiligen Alterungszustand abspeichert.The aging condition of the catalyst can either ge is based on empirical determinations of the transmission time the internal combustion engine, when used in a power vehicle over its route or, for example, at Use of an on-board computer over its total Fuel consumption (this can also affect the load spectrum be taken into account). It is preferred but suggested on the catalyst or downstream of the Ka talysators another, which records the exhaust gas composition transmit probe, in particular to provide a Sambda probe. By evaluating the signals from the two τ probes or by comparing their internal resistance The aging status of the catalytic converter can recorded and the control parameters for preheating and Heating can be adjusted accordingly. This can be done by an adaptive control can be accomplished that the saves the respective state of aging.

Ein Ausführungsbeispiel der Erfindung ist im folgenden mit weiteren Einzelheiten näher erläutert.An embodiment of the invention is as follows explained in more detail with further details.

Die schematische Zeichnung zeigt inThe schematic drawing shows in

Fig. 1 eine Vorrichtung zur Steuerung der Vor­ wärmung eines Katalysators im Abgassy­ stem einer Brennkraftmaschine in einem Kraftfahrzeug; und Figure 1 shows a device for controlling the pre-heating of a catalyst in the Abgassy stem of an internal combustion engine in a motor vehicle. and

Fig. 2 die Vorwärmung des in der Fig. 1 ge­ zeigten Katalysators anhand einer Gra­ fik, die die Vorwärmtemperatur TS über die Alterung des Katalysators wieder­ gibt. Fig. 2 shows the preheating of the ge in Fig. 1 catalyst based on a graphic that gives the preheating temperature T S over the aging of the catalyst again.

In der Fig. 1 ist teilweise ein Abgassystem 10 einer Brennkraftmaschine in einem Kraftfahrzeug gezeigt mit einem Abgasvorrohr 12, einem Dreiwege-Katalysator 14 und einem weiterführenden Abgasrohr 16. In dem Vorrohr 12 ist eine erste sambda-Sonde 18 vorgesehen, mittels der in bekannter Weise der Sauerstoffgehalt im Abgas erfaßt bzw. ein definiertes Kraftstoff-Luft-Verhältnis im nicht dargestellten Kraftstoff-Zumeßsystem der Brennkraftma­ schine einregelbar ist.In Fig. 1 is partially an exhaust system 10 of an internal combustion engine shown with a front exhaust pipe 12 in a motor vehicle, a three-way catalyst 14 and a secondary exhaust pipe 16. In the front pipe 12 , a first sambda probe 18 is provided, by means of which the oxygen content in the exhaust gas is detected in a known manner or a defined fuel-air ratio in the fuel metering system of the internal combustion engine, not shown, can be regulated.

Der Katalysator 14 ist mit einer elektrischen Heizung 20 ausgestattet, die über ein elektronisches Steuergerät 22 gesteuert ist. Das Steuergerät 22 erfaßt die Signale der ersten sambda-Sonde 18, einer zweiten, stromab des Kata­ lysators 14 angeordneten sambda-Sonde 24 und die Signale eines nicht dargestellten Wegstreckenzählers bzw. Kilo­ meterzählers (Pfeil 32). The catalytic converter 14 is equipped with an electrical heater 20 , which is controlled by an electronic control unit 22 . The control unit 22 detects the signals of the first sambda probe 18 , a second sambda probe 24 arranged downstream of the catalytic converter 14 and the signals of an odometer or kilometer meter (not shown) (arrow 32 ).

Durch Verarbeitung (logische Verknüpfung) dieser Signale wird der Alterungszustand des Katalysators 14 (siehe auch Fig. 2) ermittelt, wobei die Wegstreckenwerte empi­ risch einen Alterungszustand definieren, der mit der Auswertung der beiden Sondensignale der Lambda-Sonden 18, 24 modifiziert wird und die Anhebung des Temperatur­ schwellwertes TS(Abschaltpunkt) der Vorwärmung der Hei­ zung 20 bewirkt, die über das Steuergerät 22 geschaltet wird. Die Ist-Temperatur des Katalysators 14 wird über einen Temperatursensor 30 erfaßt, der ebenfalls mit dem Steuergerät 22 verbunden ist.By processing (logically linking) these signals, the aging state of the catalytic converter 14 (see also FIG. 2) is determined, the distance values defining an aging state empi rically, which is modified with the evaluation of the two probe signals of the lambda probes 18 , 24 and Raising the temperature threshold value T S (switch-off point) of the preheating of the heating 20 causes, which is switched via the control unit 22 . The actual temperature of the catalyst 14 is detected by a temperature sensor 30 , which is also connected to the control unit 22 .

Vorzugsweise wird der Temperaturschwellwert TS bzw. die Vorwärmzeit nach einem Polygonzug 26 gesteuert, jedoch ist auch eine lineare Anhebung (gestrichelte Linie 28) möglich. Die dargestellten Werte sind nur beispiels­ weise.The temperature threshold value T S or the preheating time is preferably controlled according to a polygon 26 , but a linear increase (dashed line 28) is also possible. The values shown are only examples.

Anstelle der elektrischen Beheizung 20 oder zusätzlich dazu kann auch eine Zusatzluftzufuhr in das Abgassystem 10 (stromauf des Vorrohres 12) der Brennkraftmaschine gesteuert werden, deren Zeitintervall entsprechend der Auswertung im Steuergerät 22 verlängert wird. Ferner kann zur Beurteilung des Alterungszustandes des Kataly­ sators 14 auch der Kraftstoffverbrauch insgesamt der Brennkraftmaschine und/oder die Betriebsstunden der Brennkraftmaschine herangezogen werden.Instead of or in addition to the electrical heating 20 , an additional air supply into the exhaust system 10 (upstream of the front pipe 12 ) of the internal combustion engine can be controlled, the time interval of which is extended in accordance with the evaluation in the control unit 22 . Furthermore, the overall fuel consumption of the internal combustion engine and / or the operating hours of the internal combustion engine can also be used to assess the aging state of the catalytic converter 14 .

Claims (7)

1. Verfahren zur Abgasentgiftung von Brennkraftmaschi­ nen, mit zumindest einem im Abgassystem angeordneten Katalysator, der durch Zuführen von Sekundärluft ins Abgas und/oder durch Beheizen vorgewärmt wird, da­ durch gekennzeichnet, daß die Vorwärmung an den Al­ terungszustand des Katalysators (14) angepaßt gesteu­ ert wird.1. A method for exhaust gas detoxification of Brennkraftmaschi NEN, with at least one arranged in the exhaust system catalytic converter, which is preheated by supplying secondary air into the exhaust gas and / or by heating, characterized in that the preheating to the aging condition of the catalyst ( 14 ) is adapted to control is heard. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß mit zunehmender Alterung des Katalysators (14) die Vorwärmung intensiviert wird.2. The method according to claim 1, characterized in that the preheating is intensified with increasing aging of the catalyst ( 14 ). 3. Verfahren nach den Ansprüchen 1 und 2, dadurch ge­ kennzeichnet, daß die Vorwärmung abhängig von der Temperatur TK stromab des Katalysators (14) gesteuert wird.3. Process according to claims 1 and 2, characterized in that the preheating is controlled depending on the temperature T K downstream of the catalyst ( 14 ). 4. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß mit zunehmender Alterung des Katalysators (14) dessen Vorwärmung auf eine höhere Temperatur TS gesteuert und/oder die Vor­ wärmzeit und/oder die Dauer der Sekundärluftzuführung verlängert wird.4. The method according to one or more of claims 1 to 3, characterized in that with increasing aging of the catalyst ( 14 ) its preheating is controlled to a higher temperature T S and / or the pre-warming time and / or the duration of the secondary air supply is extended. 5. Verfahren nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß stromab des Kata­ lysators (14) eine Lambda-Sonde (24) angeordnet wird, deren Signal S2 zur Erfassung des Alterungszustandes verwendet wird. 5. The method according to one or more of claims 1 to 4, characterized in that a lambda probe ( 24 ) is arranged downstream of the catalytic converter ( 14 ), the signal S 2 of which is used to detect the aging state. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß zur Erfassung des Alterungszustandes des Kataly­ sators (14) ferner die Signale S1 einer stromauf des Katalysators (14) liegenden Lambda-Sonde (18) miter­ faßt werden.6. The method according to claim 5, characterized in that furthermore the signals S 1 of a lambda probe (18) miter construed be located upstream of the catalyst (14) for detecting the state of aging of the Kataly crystallizer (14). 7. Verfahren nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Kraftstoffver­ brauch und/oder die Betriebsstunden der Brennkraftma­ schine und/oder bei einem Kraftfahrzeug die Wegstrek­ ke des Kraftfahrzeuges zur Erfassung des Alterungszu­ standes verwendet werden.7. The method according to one or more of claims 1 to 6, characterized in that the fuel ver consumption and / or the operating hours of the internal combustion engine machine and / or the route in a motor vehicle ke of the motor vehicle to record the aging can be used.
DE4133117A 1991-10-05 1991-10-05 Process for exhaust gas detoxification of internal combustion engines Expired - Fee Related DE4133117C2 (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4320881A1 (en) * 1993-02-26 1994-09-01 Roth Forschung Gmbh & Co Autom Combination of lambda probes
DE4308180A1 (en) * 1993-03-15 1994-09-22 Bayerische Motoren Werke Ag Method for the heating of an exhaust catalytic converter in motor vehicles
DE4332456A1 (en) * 1993-09-23 1995-03-30 Bayerische Motoren Werke Ag System for a motor vehicle with an internal combustion engine fitted with a catalytic converter
EP1201900A2 (en) 2000-10-28 2002-05-02 Bayerische Motoren Werke Aktiengesellschaft Control method for an internal combustion engine with exhaust gas catalyst
DE19807054C2 (en) * 1997-02-20 2002-05-29 Nissan Motor Control device and method for controlling the exhaust gas emission of internal combustion engines
DE4426788B4 (en) * 1993-08-07 2006-06-08 Volkswagen Ag Method for taking into account the current degree of conversion of an emission control system
WO2013178495A1 (en) * 2012-05-30 2013-12-05 Emitec Gesellschaft Für Emissionstechnologie Mbh Method for operating an exhaust gas system
DE10323979B4 (en) * 2003-05-27 2014-04-30 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Exhaust treatment device for an internal combustion engine of a motor vehicle
WO2015082805A1 (en) * 2013-12-05 2015-06-11 Peugeot Citroen Automobiles Sa Method for optimizing the detection of a defective catalytic converter
WO2023001828A1 (en) * 2021-07-22 2023-01-26 Vitesco Technologies GmbH Battery management method and battery management system for an on-board electrical system battery of a hybrid motor vehicle

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DE2328459A1 (en) * 1973-01-31 1975-01-02 Bosch Gmbh Robert System for checking activity of catalytic reactors - signals bad functioning of such reactors and causes engine to run unstable
US4099377A (en) * 1975-04-28 1978-07-11 Nissan Motor Company, Limited Internal combustion engine equipped with catalytic converter
WO1989010471A1 (en) * 1988-04-25 1989-11-02 Emitec Gesellschaft Für Emissionstechnologie Mbh Electrically conductive honeycomb body, process for monitoring it and its use as a support for an exhaust gas catalyst
DE3933924A1 (en) * 1989-10-11 1991-04-18 Bayerische Motoren Werke Ag METHOD FOR EXHAUST GAS TREATMENT ON AN INTERNAL COMBUSTION ENGINE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2328459A1 (en) * 1973-01-31 1975-01-02 Bosch Gmbh Robert System for checking activity of catalytic reactors - signals bad functioning of such reactors and causes engine to run unstable
US4099377A (en) * 1975-04-28 1978-07-11 Nissan Motor Company, Limited Internal combustion engine equipped with catalytic converter
WO1989010471A1 (en) * 1988-04-25 1989-11-02 Emitec Gesellschaft Für Emissionstechnologie Mbh Electrically conductive honeycomb body, process for monitoring it and its use as a support for an exhaust gas catalyst
DE3933924A1 (en) * 1989-10-11 1991-04-18 Bayerische Motoren Werke Ag METHOD FOR EXHAUST GAS TREATMENT ON AN INTERNAL COMBUSTION ENGINE

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4320881A1 (en) * 1993-02-26 1994-09-01 Roth Forschung Gmbh & Co Autom Combination of lambda probes
DE4308180C2 (en) * 1993-03-15 2001-09-13 Bayerische Motoren Werke Ag Method for heating an exhaust gas catalytic converter in motor vehicles
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