EP0511974A1 - Process for protecting a catalytic converter from overheating. - Google Patents

Process for protecting a catalytic converter from overheating.

Info

Publication number
EP0511974A1
EP0511974A1 EP91901691A EP91901691A EP0511974A1 EP 0511974 A1 EP0511974 A1 EP 0511974A1 EP 91901691 A EP91901691 A EP 91901691A EP 91901691 A EP91901691 A EP 91901691A EP 0511974 A1 EP0511974 A1 EP 0511974A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
cylinders
mixture
overheating
fuel supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91901691A
Other languages
German (de)
French (fr)
Other versions
EP0511974B1 (en
Inventor
Martin Klenk
Winfried Moser
Anton Kantschar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0511974A1 publication Critical patent/EP0511974A1/en
Application granted granted Critical
Publication of EP0511974B1 publication Critical patent/EP0511974B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • 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
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • F02D41/1487—Correcting the instantaneous control value
    • 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
    • F02D41/1497—With detection of the mechanical response of the engine

Definitions

  • the invention relates to a method for protecting a catalyst from overheating. Overheating can occur if misfires occur in a cylinder. Then unburnt mixture gets into the catalyst. and burns there. The resulting increase in temperature can destroy the catalytic converter and even set the affected vehicle on fire.
  • Another measure to protect a catalytic converter when the fuel supply to a cylinder is interrupted is to significantly reduce the power of the engine. Then an afterburning of air from the affected cylinder and fuel of a rich mixture from the other cylinders n also leads to overheating of the catalytic converter. Although this method does not require any special constructive measures, the considerable reduction in performance is disadvantageous.
  • a conventional method for cylinder-selective misfire detection determines whether misfires occur in a cylinder
  • combustion misfires occur due to the fact that an injection valve will no longer close, and because the mixture is over-greased, especially in the lower load range, that it is no longer ignitable.
  • the injector of the cylinder concerned is actuated with the signal to interrupt the fuel supply, this measure remains ineffective.
  • the mixture f is enriched for all cylinders so that only the oxygen for combustion that is drawn in by the affected cylinder itself is available for the considerable fuel excess from the affected cylinder.
  • the single figure shows a flow chart for explaining a method for protecting a catalytic converter from overheating
  • step s2 it is examined whether misfires occur in a cylinder. If this is not the case, the procedure is ended. It is then called repeatedly, which is also the case if the end is reached via another process. It is found in step s2 that a misfire is attempted in a step s3 to prevent the fuel supply to the cylinder affected by the fact that its injection valve is continuously supplied with the "close" signal.
  • step s4 a customary diagnostic method for the output stages of the injection valves is used to examine whether the activated injection valve actually closes.
  • the mixture is leaned in the other cylinders a by step s5.
  • the lambda control must be switched off if case-S- does not already exist in a state in which engine control is used instead of lambda control. If necessary, which depends on the respective engine type, the power b is also limited. Then the current process run is ended.
  • the emaciation is preferably carried out on the basis of the pre-control values as they are used to measure the injection durations in Lambda control or in special operating modes, eg. B. full load, available
  • These pilot control values are adapted for the operating range in which lambda control normally takes place in such a way that they lead to a lambda value of one as precisely as possible.
  • the input tax values are multiplied by a factor ⁇ 1, e.g. B. with the factor 0.9, in order to shorten the injection times and thus lean mixture.
  • the factor must be slightly smaller for values that apply to the full load range than for values that apply to the lambda control range. This is because in full load operation the pilot control values should not lead to lambda value one, but to a lambda value for rich mixture.
  • turbo engines it is advantageous to lower the boost pressure.
  • the power limitation is advantageously limited by limiting the maximum throttle valve Opening angle made.
  • the power can be limited in that the fuel supply is limited by switching off the injection valve of one cylinder or the injection valves of several cylinders in a predetermined cycle.
  • step s4 shows that the intake valve of the cylinder can no longer be closed with the misfires
  • the mixture for all cylinders is started in step s6 and the lambda control is switched off. This ensures that only the air sucked in through this cylinder is available for combustion for the excess fuel from the combustion misfires. In this case, however, the burning of fuel and oxygen in the catalytic converter cannot be completely avoided. In any case, therefore, the output is limited in order to prevent the catalyst from overheating due to the inevitable afterburning.
  • combustion misfires occur this is determined by conventional misfire detection methods, as explained. This also causes a warning lamp to light up and, if necessary, a diagnostic note to be stored. From time to time it can be examined whether the misfires still exist or whether the fault has been healed. This is described in the aforementioned DE-A-23 40 541. If the fault is no longer present, the engine control measures taken are canceled, the diagnostic information is deleted and the warning lamp is switched off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

Dans un procédé destiné à protéger les catalyseurs contre les échauffements, on détermine, au moyen d'un procédé classique de détection des ratés, s'il se produit des ratés dans un cylindre. Si tel est le cas, on s'efforce d'interrompre l'alimentation en carburant dans le cylindre concerné. Si l'on y parvient, les autres cylindres sont alimentés avec un mélange pauvre. Si l'on n'y parvient pas, on fait fonctionner tous les cylindres avec un mélange riche. En choisissant un mélange plus pauvre lorsque l'alimentation du cylindre concerné en carburant est interrompue, on parvient à ce qu'après la combustion dans les cylindres il ne reste dans le catalyseur plus aucune trace de carburant susceptible d'y être brûlé par l'oxygène aspiré par le cylindre concerné.In a method for protecting catalysts against overheating, it is determined, by means of a conventional method of detecting misfires, whether misfires occur in a cylinder. If this is the case, efforts are made to cut off the fuel supply to the cylinder concerned. If this is successful, the other cylinders are fed with a lean mixture. If this is not possible, all cylinders are run with a rich mixture. By choosing a leaner mixture when the supply of fuel to the cylinder concerned is interrupted, it is achieved that after combustion in the cylinders no trace of fuel remains in the catalyst which could be burnt there by the cylinder. oxygen aspirated by the cylinder concerned.

Description

Katalysatorschutzverfahren Catalyst protection process
Die Erfindung betrifft ein Verfahren zum Schützen eines Kataly sators vor überhitzung. Zu Überhitzung kann es kommen, wenn Zü aussetzer in einem Zylinder auftreten. Dann gelangt unverbrann tes Gemisch in den Katalysator . und verbrennt dort. Die dadurch ausgelöste Temperaturerhöhung kann den Katalysator zerstören u sogar das betroffene Fahrzeug in Brand setzen.The invention relates to a method for protecting a catalyst from overheating. Overheating can occur if misfires occur in a cylinder. Then unburnt mixture gets into the catalyst. and burns there. The resulting increase in temperature can destroy the catalytic converter and even set the affected vehicle on fire.
Stand der TechnikState of the art
Es sind zahlreiche unterschiedliche Verfahren bekannt, mit den Aussetzer erkannt werden können. Alle haben zum Ziel, die Kraf stoffzufuhr zum betroffenen Zylinder zu unterbrechen. Es steht dann aber nach wie vor die von diesem Zylinder angesaugte Luft zur Verbrennung im Katalysator zur Verfügung. Dies wird dann problematisch, wenn die anderen Zylinder mit fettem Gemisch be trieben werden, welcher Zustand sich insbesondere bei Lambda- regelung einstellt, wenn zunächst aufgrund der Überschußluft v betroffenen Zylinder mageres Gemisch angezeigt wird. Um den schädlichen Einfluß überschüssiger Luft zu vermeiden, ist es a DE-A-23 40 541 bekannt, in den Ansaugrohren zu den einzelnen Zylindern eines Motors jeweils eine ansteuerbare Klappe anzu¬ ordnen. Wird die Kraftstoffzufuhr zu einem Zylinder unterbro¬ chen, wird zugleich die zugehörige Klappe so verstellt, daß de Zylinder von der Luftzufuhr abgeschnitten wird. Diese Schutzm nähme fordert jedoch erheblichen konstruktiven Aufwand.Numerous different methods are known with which misfires can be recognized. The aim of all of them is to interrupt the fuel supply to the affected cylinder. However, the air sucked in by this cylinder is still available for combustion in the catalytic converter. This becomes problematic when the other cylinders are operated with a rich mixture, which state occurs in particular in the case of lambda control when a lean mixture is initially indicated due to the excess air v affected cylinder. In order to avoid the harmful influence of excess air, it is known from DE-A-23 40 541 to arrange a controllable flap in the intake pipes for the individual cylinders of an engine. If the fuel supply to a cylinder is interrupted, the associated flap is simultaneously adjusted so that de Cylinder is cut off from the air supply. However, this protective measure requires considerable design effort.
Eine andere Maßnahme zum Schützen eines Katalysators bei unte brochener Kraftstoffzufuhr für einen Zylinder besteht darin, die Leistung des Motors erheblich verringert wird. Dann führt auch eine Nachverbrennung von Luft aus dem betroffenen Zylind und Kraftstoff von fettem Gemisch von den anderen Zylindern n zu einer Überhitzung des Katalysators. Dieses Verfahren erfor zwar keine besonderen konstruktiven Maßnahmen, jedoch ist die erhebliche Leistungsreduzierung nachteilig.Another measure to protect a catalytic converter when the fuel supply to a cylinder is interrupted is to significantly reduce the power of the engine. Then an afterburning of air from the affected cylinder and fuel of a rich mixture from the other cylinders n also leads to overheating of the catalytic converter. Although this method does not require any special constructive measures, the considerable reduction in performance is disadvantageous.
Es besteht demgemäß seit längerem das Problem, ein Verfahren Schützen eines Katalysators vor Überhitzung im Fall von Verbr nungsaussetzern in einem Motor zu schaffen, das keine beson¬ deren konstruktiven Maßnahmen erfordert. und das nicht zu erhe licher Leistungsreduzierung führt.Accordingly, there has long been the problem of providing a method of protecting a catalytic converter from overheating in the event of misfiring in an engine which does not require any special design measures. and that does not lead to a significant reduction in performance.
Darstellung der ErfindungPresentation of the invention
Das erfindungsgemäße Verfahren zum Schützen eines Katalysator vor Uberhitzung zeichnet sich dadurch aus, daßThe inventive method for protecting a catalyst against overheating is characterized in that
- durch ein übliches Verfahren zur zylinderselektiven Aussetz erkennung ermittelt wird, ob Verbrennungsaussetzer in einem Zylinder auftreten,a conventional method for cylinder-selective misfire detection determines whether misfires occur in a cylinder,
- und daß dann, wenn dies der Fall ist, die Kraftstoffzufuhr betroffenen Zylinder unterbrochen wird und die restlichen Z linder mit magerem Gemisch versorgt werden.- And that if this is the case, the fuel supply to the affected cylinder is interrupted and the remaining cylinders are supplied with a lean mixture.
Durch diese Maßnahme ist sichergestellt, daß kein überschüssi Kraftstoff zum Katalysator gelangen kann, sondern ausschließl überschüssige Luft.This measure ensures that no excess fuel can reach the catalytic converter, but only excess air.
Das Abmagern des Gemischs kann im Vollastbereich jedoch zu ei unzulässigen Anstieg der Krümmertemperatur führen, da dann ke Kühlung durch überschüssigen Kraftstoff mehr erfolgt. Bei ver schiedenen Motortypen ist es daher von Vorteil, im Vollastber die Motorleistung zu begrenzen. Es handelt sich jedoch in die Fall nicht um die erhebliche Leistungsreduzierung, wie sie be bekannten Verfahren erforderlich ist, die nicht für mageres G misch sorgen. Dort muß eine Leistungsbegrenzung bis weit unte Vollast vorgenommen werden.The leaning of the mixture in the full load range can lead to an inadmissible increase in the manifold temperature, since then ke Cooling by excess fuel is done more. For different engine types, it is therefore advantageous to limit the engine output in full load. In the case, however, it is not a matter of the considerable power reduction as is required for known methods which do not provide for a lean mixture. There must be a power limitation to far below full load.
In Ausnahmef llen kommt es zu Verbrennungsaussetzern dadurch, daß sich ein Einspritzventil nicht mehr schließen wird und da durch vor allem im unteren Lastbereich das Gemisch so stark überfettet wird, daß es nicht mehr zündbar ist. Wird in diese Fall das Einspritzventil des betroffenen Zylinders mit dem Si nal zum Unterbrechen der Kraftstoffzufuhr angesteuert, bleibt diese Maßnahme wirkungslos. In diesem Fall wird das Gemisch f alle Zylinder angefettet, damit für den erheblichen Kraftstof überschuß aus dem betroffenen Zylinder nur der Sauerstoff zur Verbrennung zur Verfügung steht, der vom betroffenen Zylinder selbst angesaugt wird.In exceptional cases, combustion misfires occur due to the fact that an injection valve will no longer close, and because the mixture is over-greased, especially in the lower load range, that it is no longer ignitable. In this case, if the injector of the cylinder concerned is actuated with the signal to interrupt the fuel supply, this measure remains ineffective. In this case, the mixture f is enriched for all cylinders so that only the oxygen for combustion that is drawn in by the affected cylinder itself is available for the considerable fuel excess from the affected cylinder.
Zeichnungdrawing
Die einzige Figur stellt ein Flußdiagramm zum Erläutern eines Verfahrens zum Schützen eines Katalysators vor überhitzung darThe single figure shows a flow chart for explaining a method for protecting a catalytic converter from overheating
Wege zum Ausführen der ErfindungWays of Carrying Out the Invention
Bei dem in der Figur dargestellten Verfahren wird nach dem Sta des Verfahrens in einem Schritt s1 das Signal-von einem belie¬ bigen herkömmlichen zylinderselektiven Aussetzererkennungsverf ren abgerufen. In einem Schritt s2 wird untersucht, ob in eine Zylinder Aussetzer auftreten. Ist dies nicht der Fall, wird da Verfahren beendet. Es wird dann wiederholt aufgerufen, was auc der Fall ist, wenn das Ende über einen anderen Ablauf erreicht wird. Ergibt sich in Schritt s2, daß ein Zylinder Aussetzer aufweis wird in einem Schritt s3 versucht, die Kraftstoffzufuhr zum b troffenen Zylinder dadurch zu unterbinden, daß dessen Einspri ventil dauernd mit dem Signal "Schließen" versorgt wird. In ei Schritt s4 wird mit einem üblichen Diagnoseverfahren für die Endstufen der Einspritzventile untersucht, ob das angesteuert Einspritzventil tatsächlich schließt. Ist dies der Fall, wird durch einen Schritt s5 das Gemisch in den anderen Zylindern a gemagert. Hierzu muß die Lambdaregelung ausgeschaltet werden, fall-S- nicht bereits ein Zustand vorliegt, in dem mit Motorste rung statt mit Lambdaregelung gefahren wird. Falls erforderli was vom jeweiligen Motortyp abhängt, wird auch die Leistung b grenzt. Dann wird der aktuelle Verfahrensdurchlauf beendet.In the method shown in the figure, after the status of the method in a step s1, the signal is called up by any conventional cylinder-selective misfire detection method. In a step s2 it is examined whether misfires occur in a cylinder. If this is not the case, the procedure is ended. It is then called repeatedly, which is also the case if the end is reached via another process. It is found in step s2 that a misfire is attempted in a step s3 to prevent the fuel supply to the cylinder affected by the fact that its injection valve is continuously supplied with the "close" signal. In step s4, a customary diagnostic method for the output stages of the injection valves is used to examine whether the activated injection valve actually closes. If this is the case, the mixture is leaned in the other cylinders a by step s5. For this purpose, the lambda control must be switched off if case-S- does not already exist in a state in which engine control is used instead of lambda control. If necessary, which depends on the respective engine type, the power b is also limited. Then the current process run is ended.
Das Abmagern erfolgt vorzugsweise auf Grundlage der Vorsteuer werte, wie sie zum Bemessen der Einspritzdauern bei Lambdare¬ gelung- oder bei Sonderbetriebsarten, z. B. Vollast, vorliegen Diese Vorsteuerwerte sind für den Betriebsbereich, in dem nor malerweise Lambdaregelung erfolgt, so adaptiert, daß sie mög¬ lichst genau zu einem Lambdawert von Eins führen. Die Vorsteu werte werden mit einem Faktor < 1 multipliziert, z. B. mit de Faktor 0,9, um zu verkürzten Einspritzdauern und damit magere Gemisch zu kommen. Der Faktor muß für Werte, die für den Voll lastbereich gelten, etwas kleiner sein als für Werte, die für den Lambdaregelungsbereich gelten. Dies, weil im Vollastberei die Vorsteuerwerte nicht zum Lambdawert Eins führen sollen, s dern zu einem Lambdawert für fettes Gemisch.The emaciation is preferably carried out on the basis of the pre-control values as they are used to measure the injection durations in Lambda control or in special operating modes, eg. B. full load, available These pilot control values are adapted for the operating range in which lambda control normally takes place in such a way that they lead to a lambda value of one as precisely as possible. The input tax values are multiplied by a factor <1, e.g. B. with the factor 0.9, in order to shorten the injection times and thus lean mixture. The factor must be slightly smaller for values that apply to the full load range than for values that apply to the lambda control range. This is because in full load operation the pilot control values should not lead to lambda value one, but to a lambda value for rich mixture.
Eine Leistungsbegrenzung kann auf unterschiedliche Art und We erfolgen. Bei Turbomotoren ist es von Vorteil, den Ladedruck zusenken. Bei Motoren mit elektronischer Leistungssteuerung, also die Bewegung eines Fahrpedals nicht mechanisch, sondern über elektronische Steller auf eine Drosselklappe übertragen wird, wird die Leistungsbegrenzung vorteilhafterweise durch b triebspunktabhängiges Begrenzen des maximalen Drosselklappen- Öffnungswinkels vorgenommen. Bei allen übrigen Motoren läßt die Leistung dadurch begrenzen, daß die Kraftstoffzufuhr durc Abschalten des Einspritzventi les eines Zylinders oder der Ein spritzventile mehrerer Zylinder in vorgegebenem Takt begrenzt wi rd .There are different ways to limit performance. With turbo engines, it is advantageous to lower the boost pressure. In engines with electronic power control, i.e. the movement of an accelerator pedal is not transmitted to a throttle valve mechanically but via electronic actuators, the power limitation is advantageously limited by limiting the maximum throttle valve Opening angle made. For all other engines, the power can be limited in that the fuel supply is limited by switching off the injection valve of one cylinder or the injection valves of several cylinders in a predetermined cycle.
Ergibt sich in Schritt s4, daß sich das Einlaßventil des Zyli ders mit den Verbrennungsaussetzern nicht mehr schließen läßt wird in einem Schritt s6 das Gemisch für alle Zylinder angefe tet und die Lambdaregelung wird abgeschaltet. Dies sorgt dafü daß für den überschüssigen Kraftstoff aus dem Zylinder mit de Verbrennungsaussetzern nur die durch diesen Zylinder angesaug Luft zur Verbrennung zur Verfügung steht. Das Verbrennen von Kraftstoff und Sauerstoff im Katalysator läßt sich in diesem Fall aber nicht völlig vermeiden. Daher wird auf jeden Fall d Leistung begrenzt, um ein überhitzen des Katalysators durch d unvermeidliche Nachverbrennen zu verhindern.If step s4 shows that the intake valve of the cylinder can no longer be closed with the misfires, the mixture for all cylinders is started in step s6 and the lambda control is switched off. This ensures that only the air sucked in through this cylinder is available for combustion for the excess fuel from the combustion misfires. In this case, however, the burning of fuel and oxygen in the catalytic converter cannot be completely avoided. In any case, therefore, the output is limited in order to prevent the catalyst from overheating due to the inevitable afterburning.
Wenn Verbrennungsaussetzer auftreten, wird dies, wie erläuter durch übliche Aussetzererkennungsverfahren festgestellt. Dies veranlassen auch, daß eine Warnlampe aufleuchtet und ggf. ein Diagnosehinweis abgespeichert wird. Von Zeit zu Zeit kann unt sucht werden, ob die Aussetzer noch vorliegen oder ob der Fehl geheilt ist. Dies ist in der bereits genannten DE-A-23 40 541 beschrieben. Liegt der Fehler nicht mehr vor, werden die ergri fenen Motorsteuerungsmaßnahmen rückgängig gemacht, der Diagno hinweis wird gelöscht, und die Warnlampe wird ausgeschaltet. If combustion misfires occur, this is determined by conventional misfire detection methods, as explained. This also causes a warning lamp to light up and, if necessary, a diagnostic note to be stored. From time to time it can be examined whether the misfires still exist or whether the fault has been healed. This is described in the aforementioned DE-A-23 40 541. If the fault is no longer present, the engine control measures taken are canceled, the diagnostic information is deleted and the warning lamp is switched off.

Claims

Patentansprüche Claims
1. Verfahren zum Schützen eines Katalysators vor überhitzung, bei dem durch ein Verfahren zur zylinderselektiven Aussetzere kennung ermittelt wird, ob Verbrennungsaussetzer in einem Zyl der auftreten, um die Kraftstoffzufuhr zum betroffenen Zylind zu unterbrechen, wenn dies der Fall ist, dadurch gekennzeich¬ net, daß dann, wenn die Kraftstoffzufuhr zum betroffenen Zyl der unterbrochen wird, die restlichen Zylinder mit magerem Ge misch versorgt werden.1. A method for protecting a catalytic converter from overheating, in which a method for cylinder-selective misfire detection determines whether combustion misfires occur in a cylinder in order to interrupt the fuel supply to the cylinder concerned, if this is the case, that when the fuel supply to the affected cylinder is interrupted, the remaining cylinders are supplied with a lean mixture.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß dan wenn sich die Kraftstoffzufuhr zum betroffenen Zylinder aufgr eines Fehlers im Einspritzventil für diesen Zylinder trotz de entsprechenden Unterbrechungssignales nicht unterbrechen läßt das Gemisch für alle Zylinder angefettet wird und die Motorle stung begrenzt wird.2. The method according to claim 1, characterized in that dan if the fuel supply to the affected cylinder due to an error in the injection valve for this cylinder does not interrupt despite the corresponding interruption signal, the mixture is enriched for all cylinders and the engine power is limited.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß di Motorleistung begrenzt wird. 3. The method according to claim 1, characterized in that the engine power is limited.
EP91901691A 1990-01-26 1991-01-17 Process for protecting a catalytic converter from overheating Expired - Lifetime EP0511974B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4002207 1990-01-26
DE4002207A DE4002207A1 (en) 1990-01-26 1990-01-26 Catalyser protection by detection misfiring cylinder detection - cutting of fuel to misfiring cylinder and making fuel mixt. to remaining cylinders leaner
PCT/DE1991/000031 WO1991011601A1 (en) 1990-01-26 1991-01-17 Process for protecting a catalytic converter from overheating

Publications (2)

Publication Number Publication Date
EP0511974A1 true EP0511974A1 (en) 1992-11-11
EP0511974B1 EP0511974B1 (en) 1994-10-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901691A Expired - Lifetime EP0511974B1 (en) 1990-01-26 1991-01-17 Process for protecting a catalytic converter from overheating

Country Status (6)

Country Link
US (1) US5249562A (en)
EP (1) EP0511974B1 (en)
JP (1) JP3516677B2 (en)
KR (1) KR0151701B1 (en)
DE (2) DE4002207A1 (en)
WO (1) WO1991011601A1 (en)

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JP3516677B2 (en) 2004-04-05
KR0151701B1 (en) 1998-10-01
KR920703983A (en) 1992-12-18
JPH05504180A (en) 1993-07-01
DE59103363D1 (en) 1994-12-01
WO1991011601A1 (en) 1991-08-08
US5249562A (en) 1993-10-05
DE4002207A1 (en) 1991-08-01
EP0511974B1 (en) 1994-10-26

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