EP0511974B1 - Process for protecting a catalytic converter from overheating - Google Patents
Process for protecting a catalytic converter from overheating Download PDFInfo
- Publication number
- EP0511974B1 EP0511974B1 EP91901691A EP91901691A EP0511974B1 EP 0511974 B1 EP0511974 B1 EP 0511974B1 EP 91901691 A EP91901691 A EP 91901691A EP 91901691 A EP91901691 A EP 91901691A EP 0511974 B1 EP0511974 B1 EP 0511974B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- cylinders
- mixture
- fuel supply
- catalytic converter
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000013021 overheating Methods 0.000 title claims description 9
- 230000003197 catalytic effect Effects 0.000 title abstract description 9
- 239000000446 fuel Substances 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
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 against overheating. Overheating can occur if misfiring occurs 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 engine performance. Then even afterburning air from the affected cylinder and fuel from the rich mixture from the other cylinders does not lead to overheating of the catalytic converter. Although this method does not require any special design measures, the considerable reduction in output is disadvantageous.
- combustion misfires occur due to the fact that an injection valve will no longer close and the mixture, especially in the lower load range, becomes so rich that it can no longer be ignited.
- the injection valve of the cylinder concerned is actuated with the signal to interrupt the fuel supply, this measure has no effect.
- the mixture is enriched for all cylinders so that only the oxygen that is drawn in by the cylinder concerned itself is available for combustion for the considerable fuel excess from the cylinder concerned.
- the single figure is a flow chart for explaining a method of protecting a catalyst from overheating.
- step s1 After starting the method in step s1, the signal is called up by any conventional cylinder-selective misfire detection method.
- 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.
- step s3 If it emerges in step s2 that a cylinder has misfires, an attempt is made in step s3 to prevent the fuel supply to the cylinder concerned by continuously supplying its injection valve with the signal "close".
- a conventional 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 by step s5.
- the lambda control must be switched off, if there is not already a state in which the engine control is used instead of the lambda control. If necessary, depending on the type of engine, the output is also limited. Then the current process run is ended.
- the leaning is preferably carried out on the basis of the pilot control values, such as those used to measure the injection durations with lambda control or with special operating modes, eg. B. full load.
- 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 pilot values are multiplied by a factor ⁇ 1, e.g. B. with a factor of 0.9 in order to reduce 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 the full load range, the pilot values should not lead to lambda value one, but to a lambda value for a rich mixture.
- turbo engines it is advantageous to lower the boost pressure.
- the power limitation is advantageously achieved by limiting the maximum throttle valve opening angle depending on the operating point performed.
- 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 s6 the mixture is enriched for all cylinders and the lambda control is switched off. This ensures that for the excess fuel from the cylinder with the misfires only the air sucked in by this cylinder is available for combustion. In this case, however, the burning of fuel and oxygen in the catalytic converter cannot be completely avoided. Therefore, the performance is definitely limited in order to prevent the catalyst from overheating due to the inevitable afterburning.
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)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Schützen eines Katalysators vor Überhitzung. Zu Überhitzung kann es kommen, wenn Zündaussetzer in einem Zylinder auftreten. Dann gelangt unverbranntes Gemisch in den Katalysator und verbrennt dort. Die dadurch ausgelöste Temperaturerhöhung kann den Katalysator zerstören und sogar das betroffene Fahrzeug in Brand setzen.The invention relates to a method for protecting a catalyst against overheating. Overheating can occur if misfiring occurs 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.
Es sind zahlreiche unterschiedliche Verfahren bekannt, mit denen Aussetzer erkannt werden können. Alle haben zum Ziel, die Kraftstoffzufuhr 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 betrieben werden, welcher Zustand sich insbesondere bei Lambdaregelung einstellt, wenn zunächst aufgrund der Überschußluft vom betroffenen Zylinder mageres Gemisch angezeigt wird. Um den schädlichen Einfluß überschüssiger Luft zu vermeiden, ist es aus DE-A-23 40 541 bekannt, in den Ansaugrohren zu den einzelnen Zylindern eines Motors jeweils eine ansteuerbare Klappe anzuordnen. Wird die Kraftstoffzufuhr zu einem Zylinder unterbrochen, wird zugleich die zugehörige Klappe so verstellt, daß der Zylinder von der Luftzufuhr abgeschnitten wird. Diese Schutzmaßnahme fordert jedoch erheblichen konstruktiven Aufwand.Numerous different methods are known with which misfires can be identified. 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 displayed due to the excess air from the cylinder concerned. 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 adjusted so that the Cylinder is cut off from the air supply. However, this protective measure requires considerable design effort.
Ein weiteres Verfahren, das jedoch ebenfalls einen erheblichen konstruktiven Aufwand erfordert, ist aus dem abstract der JP-A-59 226 245 bekannt. Dort wird für den Fall, daß Aussetzer in einem oder mehreren Zylindern auftreten, vorgeschlagen, die Kraftstoffzufuhr zu den betroffenen Zylindern zu unterbinden und die Ein- und Auslaßventile dieser Zylinder zu schließen. Auf diese Weise wird sichergestellt, daß die betroffenen Zylinder die geregelte Kraftstoffzumessung zu den übrigen Zylindern nicht stören.Another method, which, however, also requires considerable design effort, is known from the abstract of JP-A-59 226 245. In the event that misfires occur in one or more cylinders, it is proposed to cut off the fuel supply to the cylinders concerned and to close the inlet and exhaust valves of these cylinders. This ensures that the cylinders concerned do not interfere with the regulated fuel metering to the other cylinders.
Eine andere Maßnahme zum Schützen eines Katalysators bei unterbrochener Kraftstoffzufuhr für einen Zylinder besteht darin, daß die Leistung des Motors erheblich verringert wird. Dann führt auch eine Nachverbrennung von Luft aus dem betroffenen Zylinder und Kraftstoff von fettem Gemisch von den anderen Zylindern nicht zu einer Überhitzung des Katalysators. Dieses Verfahren erfordert 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 engine performance. Then even afterburning air from the affected cylinder and fuel from the rich mixture from the other cylinders does not lead to overheating of the catalytic converter. Although this method does not require any special design measures, the considerable reduction in output is disadvantageous.
Es besteht demgemäß seit längerem das Problem, ein Verfahren zum Schützen eines Katalysators vor Überhitzung im Fall von Verbrennungsaussetzern in einem Motor zu schaffen, das keine besonderen konstruktiven Maßnahmen erfordert und das nicht zu erheblicher Leistungsreduzierung führt.Accordingly, there has long been the problem of providing a method for protecting a catalytic converter against overheating in the event of misfires in an engine, which does not require any special design measures and does not lead to a significant reduction in output.
Das erfindungsgemäße Verfahren zum Schützen eines Katalysators vor Überhitzung zeichnet sich dadurch aus, daß
- durch ein übliches Verfahren zur zylinderselektiven Aussetzererkennung ermittelt wird, ob Verbrennungsaussetzer in einem Zylinder auftreten,
- und daß dann, wenn dies der Fall ist, die Kraftstoffzufuhr zum betroffenen Zylinder unterbrochen wird und die restlichen Zylinder mit magerem Gemisch versorgt werden.
- a customary method for cylinder-selective misfire detection determines whether combustion misfires occur in a cylinder,
- and that if this is the case, the fuel supply to the cylinder concerned is interrupted and the remaining cylinders are supplied with a lean mixture.
Durch diese Maßnahme ist sichergestellt, daß kein überschüssiger Kraftstoff zum Katalysator gelangen kann, sondern ausschließlich 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 einem unzulässigen Anstieg der Krümmertemperatur führen, da dann keine Kühlung durch überschüssigen Kraftstoff mehr erfolgt. Bei verschiedenen Motortypen ist es daher von Vorteil, im Vollastbereich die Motorleistung zu begrenzen. Es handelt sich jedoch in diesem Fall nicht um die erhebliche Leistungsreduzierung, wie sie bei bekannten Verfahren erforderlich ist, die nicht für mageres Gemisch sorgen. Dort muß eine Leistungsbegrenzung bis weit unter Vollast vorgenommen werden.However, the leaning of the mixture in the full load range can lead to an inadmissible increase in the manifold temperature, since then none Cooling by excess fuel is done more. With various engine types, it is therefore advantageous to limit the engine power in the full-load range. In this case, however, it is not a matter of the considerable reduction in output which is required in known processes which do not ensure a lean mixture. There, power must be limited to far below full load.
In Ausnahmefällen kommt es zu Verbrennungsaussetzern dadurch, daß sich ein Einspritzventil nicht mehr schließen wird und dadurch vor allem im unteren Lastbereich das Gemisch so stark überfettet wird, daß es nicht mehr zündbar ist. Wird in diesem Fall das Einspritzventil des betroffenen Zylinders mit dem Signal zum Unterbrechen der Kraftstoffzufuhr angesteuert, bleibt diese Maßnahme wirkungslos. In diesem Fall wird das Gemisch für alle Zylinder angefettet, damit für den erheblichen Kraftstoffüberschuß 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 the mixture, especially in the lower load range, becomes so rich that it can no longer be ignited. In this case, if the injection valve of the cylinder concerned is actuated with the signal to interrupt the fuel supply, this measure has no effect. In this case, the mixture is enriched for all cylinders so that only the oxygen that is drawn in by the cylinder concerned itself is available for combustion for the considerable fuel excess from the cylinder concerned.
Die einzige Figur stellt ein Flußdiagramm zum Erläutern eines Verfahrens zum Schützen eines Katalysators vor Überhitzung dar.The single figure is a flow chart for explaining a method of protecting a catalyst from overheating.
Bei dem in der Figur dargestellten Verfahren wird nach dem Start des Verfahrens in einem Schritt s1 das Signal von einem beliebigen herkömmlichen zylinderselektiven Aussetzererkennungsverfahren abgerufen. In einem Schritt s2 wird untersucht, ob in einem Zylinder Aussetzer auftreten. Ist dies nicht der Fall, wird das Verfahren beendet. Es wird dann wiederholt aufgerufen, was auch der Fall ist, wenn das Ende über einen anderen Ablauf erreicht wird.In the method shown in the figure, after starting the method in 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.
Ergibt sich in Schritt s2, daß ein Zylinder Aussetzer aufweist, wird in einem Schritt s3 versucht, die Kraftstoffzufuhr zum betroffenen Zylinder dadurch zu unterbinden, daß dessen Einspritzventil dauernd mit dem Signal "Schließen" versorgt wird. In einem Schritt s4 wird mit einem üblichen Diagnoseverfahren für die Endstufen der Einspritzventile untersucht, ob das angesteuerte Einspritzventil tatsächlich schließt. Ist dies der Fall, wird durch einen Schritt s5 das Gemisch in den anderen Zylindern abgemagert. Hierzu muß die Lambdaregelung ausgeschaltet werden, falls nicht bereits ein Zustand vorliegt, in dem mit Motorsteuerung statt mit Lambdaregelung gefahren wird. Falls erforderlich, was vom jeweiligen Motortyp abhängt, wird auch die Leistung begrenzt. Dann wird der aktuelle Verfahrensdurchlauf beendet.If it emerges in step s2 that a cylinder has misfires, an attempt is made in step s3 to prevent the fuel supply to the cylinder concerned by continuously supplying its injection valve with the signal "close". In a step s4, a conventional 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 by step s5. For this purpose, the lambda control must be switched off, if there is not already a state in which the engine control is used instead of the lambda control. If necessary, depending on the type of engine, the output is also limited. Then the current process run is ended.
Das Abmagern erfolgt vorzugsweise auf Grundlage der Vorsteuerwerte, wie sie zum Bemessen der Einspritzdauern bei Lambdaregelung oder bei Sonderbetriebsarten, z. B. Vollast, vorliegen. Diese Vorsteuerwerte sind für den Betriebsbereich, in dem normalerweise Lambdaregelung erfolgt, so adaptiert, daß sie möglichst genau zu einem Lambdawert von Eins führen. Die Vorsteuerwerte werden mit einem Faktor < 1 multipliziert, z. B. mit dem Faktor 0,9, um zu verkürzten Einspritzdauern und damit magerem Gemisch zu kommen. Der Faktor muß für Werte, die für den Volllastbereich gelten, etwas kleiner sein als für Werte, die für den Lambdaregelungsbereich gelten. Dies, weil im Vollastbereich die Vorsteuerwerte nicht zum Lambdawert Eins führen sollen, sondern zu einem Lambdawert für fettes Gemisch.The leaning is preferably carried out on the basis of the pilot control values, such as those used to measure the injection durations with lambda control or with special operating modes, eg. B. full load. 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 pilot values are multiplied by a factor <1, e.g. B. with a factor of 0.9 in order to reduce 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 the full load range, the pilot values should not lead to lambda value one, but to a lambda value for a rich mixture.
Eine Leistungsbegrenzung kann auf unterschiedliche Art und Weise erfolgen. Bei Turbomotoren ist es von Vorteil, den Ladedruck abzusenken. Bei Motoren mit elektronischer Leistungssteuerung, wo also die Bewegung eines Fahrpedals nicht mechanisch, sondern über elektronische Steller auf eine Drosselklappe übertragen wird, wird die Leistungsbegrenzung vorteilhafterweise durch betriebspunktabhängiges Begrenzen des maximalen Drosselklappenöffnungswinkels vorgenommen. Bei allen übrigen Motoren läßt sich die Leistung dadurch begrenzen, daß die Kraftstoffzufuhr durch Abschalten des Einspritzventiles eines Zylinders oder der Einspritzventile mehrerer Zylinder in vorgegebenem Takt begrenzt wird.There are different ways to limit performance. With turbo engines, it is advantageous to lower the boost pressure. In engines with electronic power control, where the movement of an accelerator pedal is not transmitted to a throttle valve mechanically but via electronic actuators, the power limitation is advantageously achieved by limiting the maximum throttle valve opening angle depending on the operating point performed. 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 Zylinders mit den Verbrennungsaussetzern nicht mehr schließen läßt, wird in einem Schritt s6 das Gemisch für alle Zylinder angefettet und die Lambdaregelung wird abgeschaltet. Dies sorgt dafür, daß für den überschüssigen Kraftstoff aus dem Zylinder mit den Verbrennungsaussetzern nur die durch diesen Zylinder angesaugte 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 die Leistung begrenzt, um ein Überhitzen des Katalysators durch das unvermeidliche Nachverbrennen zu verhindern.If it turns out in step s4 that the intake valve of the cylinder can no longer be closed with the misfires, in step s6 the mixture is enriched for all cylinders and the lambda control is switched off. This ensures that for the excess fuel from the cylinder with the misfires only the air sucked in by this cylinder is available for combustion. In this case, however, the burning of fuel and oxygen in the catalytic converter cannot be completely avoided. Therefore, the performance is definitely limited in order to prevent the catalyst from overheating due to the inevitable afterburning.
Wenn Verbrennungsaussetzer auftreten, wird dies, wie erläutert, durch übliche Aussetzererkennungsverfahren festgestellt. Diese veranlassen auch, daß eine Warnlampe aufleuchtet und ggf. ein Diagnosehinweis abgespeichert wird. Von Zeit zu Zeit kann untersucht werden, ob die Aussetzer noch vorliegen oder ob der Fehler geheilt ist. Dies ist in der bereits genannten DE-A-23 40 541 beschrieben. Liegt der Fehler nicht mehr vor, werden die ergriffenen Motorsteuerungsmaßnahmen rückgängig gemacht, der Diagnosehinweis wird gelöscht, und die Warnlampe wird ausgeschaltet.As explained, when combustion misfires occur, this is determined by conventional misfire detection methods. These also cause 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 are still present or whether the error has been cured. 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 (3)
- Method for protecting a catalyst from over-heating, in which a method for cylinder-selective misfire recognition is used to determine whether misfires are occurring in a cylinder and in which a signal for interrupting the fuel supply to the cylinder concerned is emitted if this is the case, characterized in that, in the event of interruption, the fuel supply is switched over from a lambda control of the mixture composition to an open-loop control, the open-loop control for this case being designed to achieve a lean mixture for the cylinders still operating.
- Method according to Claim 1, characterized in that, if the fuel supply to the cylinder affected cannot be interrupted despite the corresponding interruption signal because of a fault in the injection valve for this cylinder, the mixture for all the cylinders is enriched and the engine power is limited.
- Method according to Claim 1, characterized in that the engine power is limited.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| DE4002207 | 1990-01-26 | ||
| 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 EP0511974A1 (en) | 1992-11-11 |
| EP0511974B1 true EP0511974B1 (en) | 1994-10-26 |
Family
ID=6398788
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) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4140147A1 (en) | 1991-12-05 | 1993-06-09 | Robert Bosch Gmbh, 7000 Stuttgart, De | IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES |
| IT1260957B (en) * | 1993-08-04 | 1996-04-29 | Fiat Ricerche | PROCEDURE AND SYSTEM FOR DETECTION OF FAILURE IN COMBUSTION IN INTERNAL COMBUSTION ENGINES. |
| DE4436085A1 (en) * | 1994-10-10 | 1996-04-11 | Daimler Benz Ag | Control procedure to optimize the pollutant emission of an incineration plant |
| DE19503317A1 (en) * | 1995-02-02 | 1996-08-08 | Bayerische Motoren Werke Ag | Device for controlling the shutdown of an injection valve in internal combustion engines |
| DE19748971A1 (en) * | 1997-11-06 | 1999-05-12 | Opel Adam Ag | System protecting exhaust catalyst from overheating in spark ignition engine |
| US6520158B1 (en) * | 2000-11-28 | 2003-02-18 | Deere & Company | Engine fuel delivery control system |
| DE10212428B4 (en) * | 2002-03-21 | 2004-05-13 | Robert Bosch Gmbh | Method for protecting an internal combustion engine |
| DE102006031254A1 (en) | 2006-07-06 | 2008-01-10 | Robert Bosch Gmbh | Method for controlling combustion engine with combustion chamber, involves overflowing air mass from air intake system into waste gas system during valve overlap of gas shuttle valves |
| JP5951537B2 (en) * | 2013-03-19 | 2016-07-13 | 三菱重工業株式会社 | Gas engine combustion control device |
| GB2524005A (en) | 2014-03-10 | 2015-09-16 | Caterpillar Motoren Gmbh & Co | Gas or dual fuel engine |
| DE102017112689A1 (en) * | 2016-06-09 | 2017-12-14 | Ford Global Technologies, Llc | System and method for compensating the wear of the cylinder deactivation |
| CN112963253A (en) * | 2021-03-23 | 2021-06-15 | 潍柴动力股份有限公司 | Control method and device for engine ignition cylinder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS517305A (en) * | 1974-07-05 | 1976-01-21 | Nissan Motor | Takitonainenkikanno shitsukakenshutsusochi |
| JPS59208134A (en) * | 1983-05-11 | 1984-11-26 | Toyota Motor Corp | Fuel injection control method |
| JPS59226245A (en) * | 1983-06-06 | 1984-12-19 | Toyota Motor Corp | Divisional operation controlling type internal- combustion engine |
| JPH0286940A (en) * | 1988-09-24 | 1990-03-27 | Mitsubishi Electric Corp | Control unit for internal combustion engine |
| US4951773A (en) * | 1989-07-25 | 1990-08-28 | General Motors Corporation | Vehicle traction control system with fuel control |
-
1990
- 1990-01-26 DE DE4002207A patent/DE4002207A1/en not_active Withdrawn
-
1991
- 1991-01-17 EP EP91901691A patent/EP0511974B1/en not_active Expired - Lifetime
- 1991-01-17 JP JP50218891A patent/JP3516677B2/en not_active Expired - Fee Related
- 1991-01-17 DE DE59103363T patent/DE59103363D1/en not_active Expired - Fee Related
- 1991-01-17 KR KR1019920701701A patent/KR0151701B1/en not_active Expired - Fee Related
- 1991-01-17 WO PCT/DE1991/000031 patent/WO1991011601A1/en active IP Right Grant
- 1991-01-17 US US07/854,628 patent/US5249562A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59103363D1 (en) | 1994-12-01 |
| KR920703983A (en) | 1992-12-18 |
| WO1991011601A1 (en) | 1991-08-08 |
| EP0511974A1 (en) | 1992-11-11 |
| KR0151701B1 (en) | 1998-10-01 |
| US5249562A (en) | 1993-10-05 |
| JP3516677B2 (en) | 2004-04-05 |
| JPH05504180A (en) | 1993-07-01 |
| DE4002207A1 (en) | 1991-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE10157104B4 (en) | Method and device for controlling transients in internal combustion engines | |
| EP0894958B1 (en) | Failure detecting unit for an internal combustion engine and method for operating an internal combustion engine | |
| DE102021103642A1 (en) | PROCEDURES AND SYSTEMS FOR A SERIES SPARK GANG IGNITION DEVICE WITH A PASSIVE ANTI-CHAMBER | |
| EP0511974B1 (en) | Process for protecting a catalytic converter from overheating | |
| DE19823021B4 (en) | Method for operating a spark-ignited piston internal combustion engine with a regulated exhaust gas catalytic converter and electromagnetically operated gas exchange valves | |
| DE3931501C2 (en) | ||
| DE102010039013A1 (en) | Method and apparatus for regeneration of a particulate filter | |
| WO2007054416A1 (en) | Method and device for operating an internal combustion engine | |
| EP1085187B1 (en) | Method and device for the increase of the torque in a direct injection internal-combustion engine with exhaust turbo-charger | |
| DE69901622T2 (en) | A CONTROL METHOD FOR SPARK IGNITION MACHINES | |
| DE4435196C1 (en) | Burner system efficiency checking method for vehicle exhaust catalytic converter warm=up | |
| DE4243085A1 (en) | ||
| EP3047131A1 (en) | Method for operation of an internal combustion engine | |
| DE10310954A1 (en) | Diagnostic procedure for a NOx sensor | |
| DE10222769B4 (en) | Method and device for controlling an engine starting process | |
| DE102010042852A1 (en) | Method for monitoring an adaptation of a delay time of an injection valve of an internal combustion engine | |
| DE10212428B4 (en) | Method for protecting an internal combustion engine | |
| DE102006005503A1 (en) | Method for operating internal combustion engine entails determining value of at least one parameter characterizing quality of combustion and comparing value with first predetermined threshold value | |
| DE102014016418A1 (en) | Method for starting a gas engine | |
| DE4002206C2 (en) | Catalyst protection process | |
| DE102007030527A1 (en) | Method for synchronizing cylinder in turbocharged spark-ignition, port-injection or particularly direct-injection internal combustion engine for vehicle, involves carrying out running smoothness measurement of internal combustion engine | |
| DE102004026180B4 (en) | Method for operating an internal combustion engine | |
| DE102009045306A1 (en) | Method and device for operating an internal combustion engine | |
| DE102020112325A1 (en) | SYSTEM AND PROCEDURE FOR DEACTIVATING MOTOR CYLINDERS | |
| DE102021200464B4 (en) | Method for operating an internal combustion engine and internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19920625 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE GB |
|
| 17Q | First examination report despatched |
Effective date: 19940323 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE GB |
|
| REF | Corresponds to: |
Ref document number: 59103363 Country of ref document: DE Date of ref document: 19941201 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19941104 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20050106 Year of fee payment: 15 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20050311 Year of fee payment: 15 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060117 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060801 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20060117 |