EP0511974B1 - Procede de protection d'un catalyseur - Google Patents

Procede de protection d'un catalyseur Download PDF

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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
Application number
EP91901691A
Other languages
German (de)
English (en)
Other versions
EP0511974A1 (fr
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/fr
Application granted granted Critical
Publication of EP0511974B1 publication Critical patent/EP0511974B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)

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.

Claims (3)

  1. Procédé de protection d'un catalyseur contre la surchauffe, selon lequel on détermine un procédé pour connaître les ratés de manière sélective par cylindre, pour savoir si un raté de combustion s'est produit dans un cylindre et qui émet un signal de coupure de l'alimentation en carburant vers le cylindre concerné lorsque cela est le cas, procédé caractérisé en ce qu'en cas de coupure de l'alimentation en carburant, on passe de la régulation lambda de la composition du mélange à une commande tandis que cette commande est conçue dans ce cas pour obtenir un mélange plus maigre pour les cylindres qui sont encore en fonctionnement.
  2. Procédé selon la revendication 1, caractérisé en ce que, lorsque l'alimentation en carburant du cylindre concerné ne peut être coupée à la suite d'un défaut de l'injecteur pour ce cylindre, malgré un signal d'interruption correspondant, on enrichit le mélange de tous les cylindres et on limite la puissance du moteur.
  3. Procédé selon la revendication 1, caractérisé en ce qu'on limite la puissance du moteur.
EP91901691A 1990-01-26 1991-01-17 Procede de protection d'un catalyseur Expired - Lifetime EP0511974B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4002207A DE4002207A1 (de) 1990-01-26 1990-01-26 Katalysatorschutzverfahren
DE4002207 1990-01-26
PCT/DE1991/000031 WO1991011601A1 (fr) 1990-01-26 1991-01-17 Procede de protection d'un catalyseur

Publications (2)

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

Family

ID=6398788

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91901691A Expired - Lifetime EP0511974B1 (fr) 1990-01-26 1991-01-17 Procede de protection d'un catalyseur

Country Status (6)

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

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1260957B (it) * 1993-08-04 1996-04-29 Fiat Ricerche Procedimento e sistema per la rilevazione di mancate combustioni in motori a combustione interna.
DE4436085A1 (de) * 1994-10-10 1996-04-11 Daimler Benz Ag Regelungsverfahren zur Optimierung der Schadstoffemission einer Verbrennungsanlage
DE19503317A1 (de) * 1995-02-02 1996-08-08 Bayerische Motoren Werke Ag Vorrichtung zur Abschaltsteuerung eines Einspritzventils bei Brennkraftmaschinen
DE19748971A1 (de) * 1997-11-06 1999-05-12 Opel Adam Ag System zum Schutz einer Katalysatoranordnung im Abgasstrang einer fremdgezündeten Brennkraftmaschine vor Überhitzung
US6520158B1 (en) * 2000-11-28 2003-02-18 Deere & Company Engine fuel delivery control system
DE10212428B4 (de) * 2002-03-21 2004-05-13 Robert Bosch Gmbh Verfahren zum Schutz einer Brennkraftmaschine
DE102006031254A1 (de) 2006-07-06 2008-01-10 Robert Bosch Gmbh Verfahren und Steuergerät zum Betreiben eines Verbrennungsmotors mit überströmender Luft
JP5951537B2 (ja) * 2013-03-19 2016-07-13 三菱重工業株式会社 ガスエンジンの燃焼制御装置
GB2524005A (en) 2014-03-10 2015-09-16 Caterpillar Motoren Gmbh & Co Gas or dual fuel engine
CN107489540B (zh) * 2016-06-09 2022-06-03 福特环球技术公司 用于减轻汽缸停用劣化的系统和方法
CN112963253A (zh) * 2021-03-23 2021-06-15 潍柴动力股份有限公司 一种发动机点火缸的控制方法及装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS517305A (en) * 1974-07-05 1976-01-21 Nissan Motor Takitonainenkikanno shitsukakenshutsusochi
JPS59208134A (ja) * 1983-05-11 1984-11-26 Toyota Motor Corp 燃料噴射制御方法
JPS59226245A (ja) * 1983-06-06 1984-12-19 Toyota Motor Corp 分割運転制御式内燃機関
JPH0286940A (ja) * 1988-09-24 1990-03-27 Mitsubishi Electric Corp 内燃機関の制御装置
US4951773A (en) * 1989-07-25 1990-08-28 General Motors Corporation Vehicle traction control system with fuel control

Also Published As

Publication number Publication date
WO1991011601A1 (fr) 1991-08-08
US5249562A (en) 1993-10-05
JP3516677B2 (ja) 2004-04-05
KR0151701B1 (ko) 1998-10-01
EP0511974A1 (fr) 1992-11-11
JPH05504180A (ja) 1993-07-01
KR920703983A (ko) 1992-12-18
DE4002207A1 (de) 1991-08-01
DE59103363D1 (de) 1994-12-01

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