DE4331153A1 - Evaluation criteria generation for exhaust gas catalyser and lambda probe - using voltage amplitude, regulation position and/or regulation frequency to generate fault-specific evaluation criteria - Google Patents

Evaluation criteria generation for exhaust gas catalyser and lambda probe - using voltage amplitude, regulation position and/or regulation frequency to generate fault-specific evaluation criteria

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Publication number
DE4331153A1
DE4331153A1 DE4331153A DE4331153A DE4331153A1 DE 4331153 A1 DE4331153 A1 DE 4331153A1 DE 4331153 A DE4331153 A DE 4331153A DE 4331153 A DE4331153 A DE 4331153A DE 4331153 A1 DE4331153 A1 DE 4331153A1
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Germany
Prior art keywords
exhaust gas
regulation
lambda probe
evaluation criteria
control
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Granted
Application number
DE4331153A
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German (de)
Other versions
DE4331153C2 (en
Inventor
Frank-Michael Dipl Ing Wittig
Wilfried Dipl Ing Bockelmann
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Volkswagen AG
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Volkswagen AG
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Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Priority to DE4331153A priority Critical patent/DE4331153C2/en
Publication of DE4331153A1 publication Critical patent/DE4331153A1/en
Application granted granted Critical
Publication of DE4331153C2 publication Critical patent/DE4331153C2/en
Anticipated expiration legal-status Critical
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
    • F01N11/007—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
    • 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
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The fault specific evaluation criteria for the functioning of a catalyser and a lambda probe inserted in an engine exhaust line are obtained using the amplitude, the regulation position and the regulation frequency of the lambda probe output voltages. The output voltages are provided by the regulation lambda probe and a diagnosis lambda probe during operation of the engine e.g. at partial load. The faulty operation of the catalyser or the regulation lambda probe is indicated upon a significant variation in the amplitude, the regulation position and/or the regulation frequency. ADVANTAGE - Reliable detection of different faults.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Patentanspruchs 1. Bekanntlich werden in den Abgasleitungen von Kraftfahrzeug-Brennkraftmaschinen, aber auch von anderen Abgas­ erzeugern, Katalysatoren zur zumindest weitgehenden Entfernung von giftigen Abgasbestandteilen, wie Kohlenmonoxid, Kohlenwas­ serstoffen und Stickoxiden, eingesetzt. Diese arbeiten nur dann zufriedenstellend, wenn sie nicht thermisch gealtert oder durch Ablagerung bestimmter im Abgas enthaltener Elemente, wie Blei, Phosphor oder Silizium, vergiftet sind. Während die thermische Alterung eines Katalysators sein Sauerstoffspeichervermögen reduziert, hat die beschriebene Katalysatorvergiftung praktisch keine Beeinträchtigung des Sauerstoffspeichervermögens zur Folge.The invention relates to a method according to the preamble of Claim 1. As is known in the exhaust pipes of Motor vehicle internal combustion engines, but also from other exhaust gases producers, catalysts for at least extensive removal of toxic exhaust gas components, such as carbon monoxide, coal water and nitrogen oxides. They only work then satisfactory if not aged or through thermally Deposition of certain elements contained in the exhaust gas, such as lead, Phosphorus or silicon are poisoned. While the thermal Aging a catalyst's oxygen storage capacity reduced, the described catalyst poisoning has practical no impairment of the oxygen storage capacity Episode.

In der Regel wird in der Abgasströmung vor dem Katalysator eine Regel-Lambdasonde angeordnet, die einen Bestandteil eines elek­ trischen Regelkreises bildet, der die Zusammensetzung des dem Abgaserzeuger zuzuführenden Kraftstoff-Luft-Gemischs auf einen für die Verbrennung und damit auch die Abgaszusammensetzung optimalen Wert einstellen soll. Infolge Anordnung der Regel- Lambdasonde in der Abgasströmung kann auch sie durch Vergiftung in ihrer Arbeitsweise beeinträchtigt werden.As a rule, one is in the exhaust gas flow upstream of the catalytic converter Control lambda probe arranged, which is part of an elec tric control loop that forms the composition of the Exhaust gas generator to be supplied fuel-air mixture on a for the combustion and thus also the exhaust gas composition should set the optimal value. Due to the arrangement of the Lambda probe in the exhaust gas flow can also cause poisoning be impaired in their way of working.

Verständlicherweise ist man daran interessiert, durch Vergiftung und/oder thermische Alterung bedingte Beeinträchtigungen der Arbeitsweisen von Katalysator und Regel-Lambdasonde erfassen zu können. So beschreiben beispielsweise die DE-OS 24 44 334, F01N 3/15, die DE-PS 34 43 649, G01M 15/00, und die DE-OS 38 30 515 und 41 01 616, F01N 3/20, Verfahren und Vorrichtungen zur Über­ wachung der Aktivität von katalytischen Reaktoren, die aber letztlich alle nur Beeinträchtigungen durch die thermische Alte­ rung, nicht aber durch Vergiftung, zu erkennen gestatten. Auch bietet dieser Stand der Technik nicht die Möglichkeit, Beein­ trächtigungen der Arbeitsweise nur der Regel-Lambdasonde zu er­ fassen.Understandably, one is interested in poisoning and / or thermal aging-related impairments of the  The modes of operation of the catalytic converter and the control lambda sensor record can. For example, DE-OS 24 44 334, F01N 3/15, DE-PS 34 43 649, G01M 15/00, and DE-OS 38 30 515 and 41 01 616, F01N 3/20, methods and devices for transferring monitoring the activity of catalytic reactors, however ultimately all only impairments from the thermal old allow, but not through poisoning to recognize. Also this prior art does not offer the possibility of leg The operating mode of the control lambda probe only grasp.

Der Erfindung liegt demgemäß die Aufgabe zugrunde, ein gattungs­ gemäßes Verfahren zur Gewinnung von fehlerspezifischen Beurtei­ lungskriterien zu schaffen, die die Möglichkeit bieten, prak­ tisch alle bei der "Kombination" von Regel-Lambdasonde und Kata­ lysator auftretenden Fehler zu erfassen und zu unterscheiden.The invention is therefore based on the object, a genus appropriate procedure for obtaining error-specific assessment creating criteria that offer the opportunity to table all with the "combination" of control lambda probe and Kata to detect and distinguish errors occurring.

Die erfindungsgemäße Lösung dieser Aufgabe besteht in einem gattungsgemäßen Verfahren mit den kennzeichnenden Merkmalen des Hauptanspruchs, eine vorteilhafte Ausbildung dieses Verfahrens ist Gegenstand des Unteranspruchs.This object is achieved in one Generic method with the characterizing features of Main claim, an advantageous embodiment of this process is the subject of the subclaim.

Das erfindungsgemäße Verfahren stellt mit einfachen Mitteln Kriterien zur Verfügung, die es gestatten, durch Vergleich von Parametern der Ausgangsspannungen der beiden Lambdasonden und in Kenntnis der Soll-Spannungsverläufe bei der definierten Be­ triebsweise des Abgaserzeugers, also in der Regel einer Brenn­ kraftmaschine, eindeutige Rückschlüsse sowohl über die Existenz fehlerhafter Arbeitsweisen von Regelsonde und Katalysator schlechthin als auch hinsichtlich der Ursachen dieser Fehler zu ziehen. Dazu ist lediglich die Kenntnis der auf die verschiede­ nen Fehlermöglichkeiten zurückzuführenden Abweichungen der Son­ denausgangsspannung von ihren - ordnungsgemäßen Betriebsweisen zugeordneten - Sollwerten erforderlich.The method according to the invention provides simple means Criteria are available that allow comparing Parameters of the output voltages of the two lambda sensors and in Knowledge of the target voltage curves for the defined load drive mode of the exhaust gas generator, so usually a combustion engine, clear conclusions both about existence incorrect operation of the control probe and catalytic converter per se as well as regarding the causes of these errors pull. To do this is only the knowledge of the different deviations of the son due to possible errors the output voltage from their - proper operations assigned - setpoints required.

In der beigefügten Zeichnung sind für fünf verschiedene Fehler­ möglichkeiten der "Kombination" aus Regel-Lambdasonde und Abgas­ katalysator die Verläufe der jeweiligen Spannung u1 über der Zeit t am Ausgang der Regel-Lambdasonde und u2 über der Zeit t der Diagnose-Lambdasonde einander gegenübergestellt. Vorausge­ setzt ist dabei während der Erfassung dieser Spannungsverläufe eine praktisch stationäre Betriebsweise des Abgaserzeugers, hier der Brennkraftmaschine eines Kraftfahrzeugs.In the attached drawing there are five different errors  Possibilities of the "combination" of control lambda probe and exhaust gas the course of the respective voltage u1 over the Time t at the output of the control lambda probe and u2 over time t the diagnostic lambda sensor compared to each other. Predicted is set while recording these voltage profiles a practically stationary mode of operation of the exhaust gas generator, here the internal combustion engine of a motor vehicle.

Betrachtet man zunächst die beiden obersten Spannungsverläufe, so ergeben sie sich, wenn sowohl der Katalysator als auch die Regelsonde sich in einwandfreiem Betriebszustand befinden, also weder eine thermische Alterung noch eine Vergiftung vorliegt. Wie man erkennt, ist die Amplitude der Ausgangsspannung u2 der Diagnosesonde angesichts der abgasreinigenden Wirkung des Kata­ lysators erheblich kleiner als die Spannungsamplitude der Aus­ gangsspannung u1 der in Strömungsrichtung vor dem Katalysator angeordneten Regelsonde.If you first look at the top two voltage curves, so they result when both the catalyst and the Control probe are in perfect operating condition, so there is neither thermal aging nor poisoning. As can be seen, the amplitude of the output voltage u2 is the Diagnostic probe in view of the exhaust gas cleaning effect of the kata lysators significantly smaller than the voltage amplitude of the off output voltage u1 in the direction of flow in front of the catalytic converter arranged control probe.

In dem zweiten Diagrammpaar von oben ist der Spannungsverlauf u1 am Ausgang der Regeldiode unverändert geblieben, während die Amplitude der Ausgangsspannung u2 der Diagnosesonde einen Schwellwert überschritten hat. Dies ist ein Anzeichen für thermische Alterung des Katalysators, während sich die Regel­ sonde nach wie vor in ordnungsgemäßen Zustand befindet.In the second pair of diagrams from above, the voltage curve is u1 at the output of the control diode remained unchanged, while the Amplitude of the output voltage u2 of the diagnostic probe one Has exceeded the threshold. This is an indication of thermal aging of the catalyst while changing the rule probe is still in good condition.

Demgegenüber zeichnet sich der dem dritten Diagrammpaar von oben in der Zeichnung zugrundeliegende Fall einer thermisch gealter­ ten Regelsonde, aber eines einwandfreien Katalysators dadurch aus, daß bei unverändertem Spannungsverlauf u1 am Ausgang der Regelsonde der Spannungsverlauf u2 am Ausgang der Diagnosesonde gleichsam eine höhere Regellage, nämlich in Richtung fetter, de­ finiert; Amplitude und Frequenz beider Ausgangsspannungen sind gegenüber dem Ausgangszustand (oberstes Diagrammpaar) unverän­ dert geblieben.In contrast, the third pair of diagrams is shown from above in the drawing underlying case of a thermally aged ten control probe, but a perfect catalyst from that with unchanged voltage curve u1 at the output of the Control probe the voltage curve u2 at the output of the diagnostic probe as it were a higher standard position, namely in the direction of fat, de finishes; The amplitude and frequency of both output voltages are unchanged compared to the initial state (top pair of diagrams) remained.

Während sich die bisher behandelten beiden Fehlerfälle auf ther­ mische Alterung beziehen, treten die weiteren drei Diagrammpaare der Zeichnung im Falle einer Vergiftung auf.While the two error cases dealt with so far refer to ther  As regards mixed aging, the other three pairs of diagrams appear the drawing in case of poisoning.

Betrachtet man zunächst das vierte Diagrammpaar von oben, so ist angenommen, daß Katalysator und Regelsonde vergiftet sind. Dies hat eine reduzierte Regelfrequenz der Regelsonde, d. h. eine re­ duzierte Frequenz ihrer Ausgangsspannung u1 und demgemäß (ent­ sprechend der dadurch verringerten "Beeinflussungsfrequenz" des Abgases) eine verringerte Regelfrequenz in der Ausgangsspannung u2 der Diagnosesonde zur Folge. Hinzu kommt eine Drift der Regellage der Spannung u2 in Richtung fett.If you first look at the fourth pair of diagrams from above, then assumed that the catalyst and control probe are poisoned. This has a reduced control frequency of the control probe, i. H. a right reduced frequency of their output voltage u1 and accordingly (ent speaking of the thereby reduced "influence frequency" of the Exhaust gas) a reduced control frequency in the output voltage u2 of the diagnostic probe. There is also a drift of Normal position of voltage u2 in the direction of bold.

Dem fünften Diagrammpaar von oben in der Zeichnung liegt der­ selbe Fehlerfall zugrunde. Die Ausgangsspannung u1 der Regel­ sonde ist gegenüber dem eben behandelten Fall unverändert ge­ blieben, dementsprechend zeigt sich auch für die Ausgangsspan­ nung u2 der Diagnosesonde eine gegenüber dem ordnungsgemäßen Zustand verringerte Regelfrequenz. Gegenüber dem eben behan­ delten Diagrammpaar fehlt jedoch die Drift in Richtung fett.The fifth pair of diagrams from above in the drawing is the same error case. The output voltage u1 usually probe is unchanged from the case just discussed accordingly, it also shows up for the initial chip voltage u2 of the diagnostic probe compared to the normal one Condition reduced control frequency. Opposed to that However, the graph pair lacks the drift towards bold.

Wie sich gezeigt hat, kann bei Vergiftung von Katalysator und Regelsonde auch das unterste Diagrammpaar in der Figur auftreten und signifikant sein: Die Regelfrequenz ist unverändert geblie­ ben, ebenso die Amplituden der beiden Ausgangsspannungen u1 und u2 der Lambdasonden. Dagegen ist die Regellage der Ausgangsspan­ nung u2 der Diagnosesonde in der Zeichnung nach unten, d. h. in Richtung mager, verschoben. Dies zeigt deutlich ein Vergleich der beiden rechten Diagramme des obersten und des untersten Dia­ grammpaars in der Zeichnung.As has been shown, the catalyst and poisoning can Control probe also occur the bottom pair of diagrams in the figure and be significant: The control frequency has remained unchanged ben, as well as the amplitudes of the two output voltages u1 and u2 of the lambda sensors. In contrast, the standard position is the starting chip voltage u2 of the diagnostic probe in the drawing downwards, d. H. in Towards lean, shifted. This is clearly shown by a comparison of the two right diagrams of the top and bottom slide pairs of grams in the drawing.

Dadurch, daß das erfindungsgemäße Verfahren gleichsam drei Ein­ zelparameter, nämlich Spannungsamplitude, Regellagendrift und Regelfrequenz (als Maß für die Ansprechgeschwindigkeit der Regelsonde) zur Verfügung stellt, ist es möglich, gleichsam in einer die Zusammenstellung in der Zeichnung zugrundelegenden Verfahrensweise nicht nur fehlerhafte Arbeitsweisen von Regel­ sonde und Katalysator schlechthin zu erkennen, sondern auch die Zuordnung der Fehler zu Regelsonde und/oder Katalysator sowie die Art der Fehler zu diagnostizieren.Because the method according to the invention, as it were, three Ein individual parameters, namely voltage amplitude, control position drift and Control frequency (as a measure of the response speed of the Control probe), it is possible, as it were, in one based on the compilation in the drawing Procedures not just erroneous ways of working by rule  to recognize the probe and catalyst par excellence, but also the Allocation of errors to control probe and / or catalytic converter as well diagnose the nature of the errors.

Claims (2)

1. Verfahren zur Gewinnung von fehlerspezifischen Beurteilungs­ kriterien für die Arbeitsweisen eines in einer Abgasleitung angeordneten, der Abgasreinigung dienenden Katalysators und einer vor diesem in der Abgasströmung angeordneten Regel- Lambdasonde, die Bestandteil eines elektrischen Regelkreises ist, dadurch gekennzeichnet, daß eine Diagnose-Lambdasonde in der Abgasströmung hinter dem Katalysator angeordnet wird und sowohl die Amplitude als auch die Regellage als auch die Regelfrequenz der Ausgangsspannungen beider Lambdasonden während zumindest einer vorgegebenen Betriebsweise des Abgas­ erzeugers ermittelt werden, bei der fehlerhaftes Arbeiten von Katalysator und Regelsonde zu signifikanten Änderungen der Amplitude und/oder der Regellage und/oder der Regelfrequenz führen.1. A method for obtaining error-specific assessment criteria for the operations of an arranged in an exhaust pipe, the exhaust gas purifying catalyst and arranged in front of this in the exhaust gas flow control lambda probe, which is part of an electrical control circuit, characterized in that a diagnostic lambda probe in the exhaust gas flow is arranged behind the catalytic converter and both the amplitude and the control position and the control frequency of the output voltages of both lambda probes are determined during at least one predetermined mode of operation of the exhaust gas generator, in which the catalytic converter and control probe work incorrectly resulting in significant changes in the amplitude and / or the control position and / or the control frequency. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Abgaserzeuger mit Teillast betrieben wird.2. The method according to claim 1, characterized in that the Exhaust gas generator is operated with partial load.
DE4331153A 1992-09-26 1993-09-14 Method for obtaining error-specific evaluation criteria of an exhaust gas catalytic converter and a control lambda probe Expired - Fee Related DE4331153C2 (en)

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DE4331153A DE4331153C2 (en) 1992-09-26 1993-09-14 Method for obtaining error-specific evaluation criteria of an exhaust gas catalytic converter and a control lambda probe

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EP0694684A2 (en) * 1994-07-19 1996-01-31 MAGNETI MARELLI S.p.A. Electronic gas concentration control system
EP0694685A2 (en) * 1994-07-19 1996-01-31 MAGNETI MARELLI S.p.A. Electronic gas concentration control system
WO1997014876A1 (en) * 1995-10-18 1997-04-24 Renault Device and method for diagnosing the condition of a probe upstream from a catalytic converter
EP0793009A2 (en) * 1996-02-28 1997-09-03 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio control apparatus for internal combustion engine
EP0823546A1 (en) * 1996-08-09 1998-02-11 Toyota Jidosha Kabushiki Kaisha A device for determining deterioration of a catalyst for an engine
FR2773844A1 (en) * 1998-01-17 1999-07-23 Bosch Gmbh Robert METHOD AND DEVICE FOR THE DIAGNOSIS OF A NOX STORAGE CATALYST APPLICABLE TO COMBUSTION ENGINES
EP1703108A1 (en) * 2005-02-24 2006-09-20 Hitachi, Ltd. Diagnosis apparatus for an internal combustion engine
DE102005024872A1 (en) * 2005-05-31 2006-12-14 Siemens Ag Method and device for determining an oxygen storage capacity of the exhaust gas catalytic converter of an internal combustion engine and method and device for determining a dynamic time duration for exhaust gas probes of an internal combustion engine
EP1734241A1 (en) * 2005-06-17 2006-12-20 Ford Global Technologies, LLC Method for diagnosing a secondary lambda probe in a catalytic converter
DE102006014916A1 (en) * 2006-03-30 2007-10-18 Siemens Ag Diagnostic method for an exhaust gas probe and diagnostic device for an exhaust gas probe
US8065871B1 (en) 2007-01-02 2011-11-29 Cummins Ip, Inc Apparatus, system, and method for real-time diagnosis of a NOx-adsorption catalyst
US8756922B2 (en) 2011-06-10 2014-06-24 Cummins Ip, Inc. NOx adsorber catalyst condition evaluation apparatus and associated methods
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EP0952322A2 (en) * 1994-07-19 1999-10-27 MAGNETI MARELLI S.p.A. Electronic air-fuel ratio control system for internal combustion engines
EP0694685A2 (en) * 1994-07-19 1996-01-31 MAGNETI MARELLI S.p.A. Electronic gas concentration control system
EP0694684A3 (en) * 1994-07-19 1996-09-11 Magneti Marelli Spa Electronic gas concentration control system
EP0694685A3 (en) * 1994-07-19 1996-09-18 Magneti Marelli Spa Electronic gas concentration control system
US5637276A (en) * 1994-07-19 1997-06-10 MAGNETI MARELLI S.p.A. Electronic concentration control system
US5697214A (en) * 1994-07-19 1997-12-16 MAGNETI MARELLI S.p.A. Electronic concentration control system
EP0694684A2 (en) * 1994-07-19 1996-01-31 MAGNETI MARELLI S.p.A. Electronic gas concentration control system
EP0952322A3 (en) * 1994-07-19 1999-11-03 MAGNETI MARELLI S.p.A. Electronic air-fuel ratio control system for internal combustion engines
WO1997014876A1 (en) * 1995-10-18 1997-04-24 Renault Device and method for diagnosing the condition of a probe upstream from a catalytic converter
FR2740173A1 (en) * 1995-10-18 1997-04-25 Renault DEVICE AND METHOD FOR DIAGNOSING THE STATUS OF A PROBE DISPOSED PRIOR TO THE CATALYTIC POT
EP0793009A2 (en) * 1996-02-28 1997-09-03 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio control apparatus for internal combustion engine
EP0793009A3 (en) * 1996-02-28 1999-08-11 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio control apparatus for internal combustion engine
US5983629A (en) * 1996-08-09 1999-11-16 Toyota Jidosha Kabushiki Kaisha Device for determining deterioration of a catalyst for an engine
EP0823546A1 (en) * 1996-08-09 1998-02-11 Toyota Jidosha Kabushiki Kaisha A device for determining deterioration of a catalyst for an engine
FR2773844A1 (en) * 1998-01-17 1999-07-23 Bosch Gmbh Robert METHOD AND DEVICE FOR THE DIAGNOSIS OF A NOX STORAGE CATALYST APPLICABLE TO COMBUSTION ENGINES
US7752837B2 (en) 2005-02-24 2010-07-13 Hitachi, Ltd. Diagnosis apparatus for internal combustion engine
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