GB2329131A - Air supply to a catalytic converter - Google Patents

Air supply to a catalytic converter Download PDF

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Publication number
GB2329131A
GB2329131A GB9819557A GB9819557A GB2329131A GB 2329131 A GB2329131 A GB 2329131A GB 9819557 A GB9819557 A GB 9819557A GB 9819557 A GB9819557 A GB 9819557A GB 2329131 A GB2329131 A GB 2329131A
Authority
GB
United Kingdom
Prior art keywords
combustion engine
internal combustion
catalytic converter
oxidation catalyst
oxygen
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.)
Withdrawn
Application number
GB9819557A
Other versions
GB9819557D0 (en
Inventor
Andreas Posselt
Christian Koehler
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 GB9819557D0 publication Critical patent/GB9819557D0/en
Publication of GB2329131A publication Critical patent/GB2329131A/en
Withdrawn legal-status Critical Current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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F01N3/222—Control of additional air supply only, e.g. using by-passes or variable air pump drives using electric valves only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Landscapes

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

Abstract

An internal combustion engine (1), in particular for a motor vehicle, is described which is provided with means for the purpose of combusting a fuel/air mixture in a combustion chamber (4) and is provided with a catalytic converter (12) for the purpose of treating the exhaust gas which is produced during the combustion procedure. The catalytic converter (12) comprises a storage catalyst (13) and an oxidation catalyst (14). Means for the purpose of supplying air are provided upstream of the oxidation catalyst (14).

Description

DESCRIPTION INTERNAL COMBUSTION ENGINE IN PARTICULAR FOR A MOTOR VEHICLE The invention relates to a method for the purpose of operating an internal combustion engine, in particular of a motor vehicle, wherein a fuel/air mixture is combusted in a combustion chamber, and wherein the exhaust gas, which is produced during the combustion procedure, is treated by means of a catalytic converter, wherein the catalytic converter is suitable for the purpose of reducing nitrogen oxides and for oxidating hydrocarbons and/or carbon monoxides. Furthermore, the invention relates to an internal combustion engine, in particular for a motor vehicle. having means for the purpose of combusting a fuel/air mixture in a combustion chamber, and having a catalytic converter for the purpose of treating the exhaust gas which is produced during the combustion procedure, wherein the catalytic converter comprises a storage catalyst and an oxidation catalyst.
A method and internal combustion engine of this type are known from the German patent document DE 195 06 980 C2, wherein the exhaust gases produced during the combustion procedure are supplied to a catalytic converter which is provided inter alia for the purpose of reducing nitrogen oxides. On the one hand, a catalytic converter of this type functions as an oxidation catalyst. This means that, in the event of a lack of oxygen, the oxygen is removed from the nitrogen oxides and therefore hydrocarbons, which are produced during the combustion procedure, and the carbon monoxides, which are produced in the same manner, are oxidated. In the case of an excess quantity of oxygen, the oxidation catalyst could also reduce the nitrogen oxides per se.
However, owing to the oxygen, which is provided in an excess quantity, this reaction does not take place and instead the oxidation catalyst uses the excess quantity of oxygen. On the other hand, the said catalytic converter functions as a storage catalyst. This means that, in the event of an excess quantity of oxygen, the storage catalyst absorbs the nitrogen oxides, which are produced during the combustion procedure.
In the event of a lack of oxygen, the storage catalyst again releases the nitrogen oxides which have been absorbed.
By using the oxidation catalyst and the storage catalyst in the said catalytic converter, the nitrogen oxides, which in the event of an excess quantity of oxygen cannot be utilized by the oxidation catalyst, cannot be absorbed and stored in an intermediate manner by the storage catalyst. In the event of a lack of oxygen, it is then possible for the nitrogen oxides, which are released again by the storage catalyst, to be reduced by the oxidation catalyst.
However, the storage catalyst can only absorb a limited quantity of nitrogen oxides. As a consequence, the storage catalyst must be discharged again after a specific charging time, in which it absorbs the nitrogen oxides. This discharging is achieved in the event of a lack of oxygen. The internal combustion engine is therefore controlled and/or regulated in such a manner that a rich fuel/air mixture is produced.
Under these conditions the storage catalyst again releases the nitrogen oxides which are used in the oxidation catalyst for the oxidation of the hydrocarbons andlor the carbon monoxides. Nitrogen, water and carbon dioxide are then produced as reaction products.
It has come to light that when the storage catalyst is discharged in this manner, it is frequently the case that an excess quantity of hydrocarbons and carbon monoxide is provided. This excess quantity cannot be oxidated by the oxygen which is released from the nitrogen oxides, so that hydrocarbons and/or carbon monoxide pass into the environment as contaminants.
It is the object of the invention, to provide a method and an internal combustion engine of the type mentioned in the introduction which render it possible in each case to oxidate completely the hydrocarbons and/or the carbon monoxides In the case of a method of the type mentioned in the introduction, this object is achieved in accordance with the invention by virtue of the fact that air is supplied to the catalytic converter. In the case of an internal combustion engine of the type mentioned in the introduction, the object is achieved in accordance with the invention by virtue of the fact that means for the purpose of supplying air are provided upstream of the oxidation catalyst.
By virtue of the supply of air, it is possible for the hydrocarbons and the carbon monoxides to be oxidated by the oxygen, which is released from the nitrogen oxides, and by the oxygen which is provided in the air supplied. An excess quantity of hydrocarbons and carbon monoxides can thus also be reduced by virtue of the air supplied.
Therefore, the entire hydrocarbons and carbon monoxides can be converted into water and carbon dioxide. Noxious hydrocarbons and/or carbon monoxides are therefore no longer released into the environment.
The method in accordance with the invention can be used on the one hand in the case of an internal combustion engine, wherein the fuel is injected into the intake pipe and the said internal combustion engine is preferably operated with a lean fuel/air mixture. On the other hand, the method in accordance with the invention is used in the case of an internal combustion engine, wherein the fuel is injected directly into the combustion chamber.
It is particularly expedient, if the air is supplied during an operating phase, in which the internal combustion engine has a lack of oxygen. This is precisely the operating phase in which the excess quantity of hydrocarbons and/or carbon monoxides is most prevalent.
The supply of air in this operating phase guarantees that the hydrocarbons and carbon monoxides are completely oxidated.
In the case of an advantageous embodiment of the invention, a pump is provided for the purpose of supplying the air. In this manner, air is then supplied reliably if an excess pressure is present in the catalytic converter owing to the through-flowing exhaust gases.
Furthermore, the pump can be controlled by means of a control device in dependence upon the respective operating phase, i.e it can be switched on and off.
In the case of an advantageous embodiment of the invention a valve, which can be controlled in particular by a control device, is disposed upstream of the oxidation catalyst. In this manner, the supply of air to the oxidation catalyst can be controlled and/or regulated in an extremely precise manner.
It is particularly expedient if a non-return valve is disposed upstream of the oxidation catalyst. In this manner, exhaust gases are reliably prevented from escaping from the catalytic converter, before they have been oxidated, andlor exhaust gases are prevented from passing to the pump.
Further features, possibilities for application and advantages of the invention are evident in the description herein under of exemplified embodiments of the invention, which are illustrated in the drawing. All of the described or illustrated features produce, in their own right or in any combination, the subject matter of the invention, irrespective of their combination in the claims or their relation and irrespective of their wording and illustration in the description and drawing respectively.
The single Figure of the drawing shows a schematic block diagram of an exemplified embodiment of an internal combustion engine, in accordance with the invention, of a motor vehicle.
An internal combustion engine 1 is illustrated in the Figure, wherein a piston 2 can be moved in a reciprocal manner in a cylinder 3.
The cylinder 3 is provided with a combustion chamber 4 to which an intake pipe 6 and an exhaust gas pipe 7 are connected by way of valves 5. Furthermore, the combustion chamber 4 is allocated an injection valve 8 and a spark plug 9.
In a first mode of operation, the layered operation of the internal combustion engine 1, the fuel is injected into the combustion charnber 4 by the injection valve 8 during a compression phase, which is produced by virtue of the piston 2, and furthermore, said fuel is injected in a localized manner into the direct proximity of the spark plug 9 and with respect to time immediately prior to the top dead centre of the piston 2.
Subsequently, the fuel is ignited with the aid of the spark plug 9, so that the piston 2 is driven in the following operating phase by virtue of the expansion of the ignited fuel.
In a second mode of operation, the homogenous operation of the internal combustion engine 1, the fuel is injected into the combustion chamber 4 by the injection valve 8 during an intake phase which is produced by virtue of the piston 2. The air, which is drawn in simultaneously, serves to swirl the injected fuel and therefore distribute it in a substantially uniform manner in the combustion chamber 4.
Thereafter, the fuel/air mixture is compressed during the compression phase, in order then to be ignited by the spark plug 9. The expansion of the ignited fuel serves to drive the piston 2.
In the layered operation and also in the homogenous operation, the driven piston serves to rotate a crank shaft 10, by way of which the wheels of the motor vehicle are ultimately driven.
The fuel mass which is injected into the combustion chamber 4 by the injection valve 8 in the layered operation and in the homogenous operation is controlled and/or regulated by a control device 11 in particular with respect to low fuel consumption and/or low gas development. For this purpose, the control device 11 is provided with a microprocessor, which has a program stored in a storage medium, in particular a read-only-memory, which program is suitable for implementing the said control andlor regulation procedure.
The exhaust gas pipe 7 is connected to a catalytic converter 12 which is provided with a storage catalyst 13 for the purpose of storing nitrogen oxides, and is provided with an oxidation catalyst 14 for the purpose of oxidating in particular hydrocarbons and carbon monoxides.
The storage catalyst 13 is disposed upstream of the oxidation catalyst 14 in the direction of flow of the exhaust gas.
Either an excess quantity of oxygen, i.e a lean mixture, or a lack of oxygen, i.e a rich mixture, or a stoichiometric ratio of the fuel and air is produced in the combustion chamber 4 of the internal combustion engine 1 in dependence upon the ratio of the fuel/air mixture which is adjusted by virtue of the control device 11. The rich mixture is adjusted in particular in the homogenous operation of the internal combustion engine 1, whereas the lean mixture is provided for reducing consumption in particular in the layered operation.
In the event of an excess quantity of oxygen, the oxidation catalyst 14 could reduce per se the nitrogen oxides supplied to the catalytic converter 12 and therefore remove the oxygen from the nitrogen oxides. However, owing to the excess quantity of oxygen, the oxidation catalyst 14 absorbs the excess quantity of oxygen. The nitrogen oxides, which are not used by the oxidation catalyst 14, are absorbed by the storage catalyst 13 and stored therein. This represents a charging procedure of the storage catalyst 13, wherein the nitrogen oxides flow to the catalytic converter 12.
In the event of a lack of oxygen, the storage catalyst 13 again releases the stored nitrogen oxides. This represents a discharging procedure of the storage catalyst 13, wherein the nitrogen oxides flow off from the catalytic converter 12. Owing to the lack of oxygen, there is an insufficient quantity of oxygen, for which reason the oxidation catalyst 14 removes the oxygen from the nitrogen oxides, in order therefore to oxidate the hydrocarbons and carbon monoxides which are produced during the combustion procedure.
The storage catalyst 13 cannot store nitrogen oxides in an unlimited manner. For this reason the charging procedure must be limited with respect to time. Subsequently, the storage catalyst 13 must be discharged again. This charging and discharging procedure is controlled and/or regulated by the control device 11 by virtue of a corresponding supply of oxygen. The respective supply of oxygen is achieved by virtue of the corresponding operation of the internal combustion engine 1 in the homogenous operation or in the layered operation. In particular, in order to influence the supply of oxygen, a throttle valve 15 is used which is provided in the intake pipe 6.
Means, which serve to supply air to the catalytic converter.12, are provided between the storage catalyst 13 and the oxidation catalyst 14.
In the case of the exemplified embodiment illustrated in the Figure, the means consist of a pipe 16, which connects the catalytic converter 12 to a controllable pump 17. Furthermore, the pipe 16 is provided with a controllable valve 18. The pump 17 can be switched on and off for example by the control device 11. The valve 18 can be opened and closed for example also by the control device 11.
Alternatively, it is also possible to provide a non-return valve or the like as means instead of the controllable valve 18 and/or to design the pump 17 as non-controllable, i.e to leave the pump permanently switched on.
In the case of the exemplified embodiment illustrated in the Figure, the pump 17 is switched on and the valve 18 is opened when the storage catalyst 13 is discharged, i.e in the event of a lack of oxygen. Therefore, air and thus additional oxygen pass to the oxidation catalyst 14. Since, in the event of a lack of oxygen, i.e in the case of a rich fuel/air mixture, an increased quantity of hydrocarbons and/or carbon monoxides is/are produced, they are oxidated on the one hand by virtue of the oxygen, which is released from the nitrogen oxides, and they are oxidated on the other hand by virtue of the additional oxygen from the air.
When the storage catalyst 13 is being charged, the valve 18 is closed. The pump 17 can continue to run or can be switched off.
Alternatively, it is possible to leave the valve 18 open and the pump 17 switched on when the storage catalyst 13 is being charged, i.e in the event of an excess quantity of oxygen and therefore in the case of a lean fuel/air mixture. In this case the valve 18 can be replaced by the previously mentioned non-return valve, which, in particular, prevents exhaust gases from passing to the pump 17.

Claims (8)

1. A method for the purpose of operating an internal combustion engine in particular of a motor vehicle, wherein a fuel/air mixture is combusted in a combustion chamber, the exhaust gas, which is produced during the combustion procedure, being treated by means of a catalytic converter, and the catalytic converter being suitable for the purpose of reducing nitrogen oxides and for the oxidation of hydrocarbons and/or carbon monoxides, wherein air is supplied to the catalytic converter.
2. A method according to claim 1, wherein the air is supplied during an operating phase, in which the internal combustion engine has a lack of oxygen.
3. An internal combustion engine, in particular for a motor vehicle, having means for the purpose of combusting a fueVair mixture in a combustion chamber, and having a catalytic converter for the purpose of treating the exhaust gas, which is produced during the combustion procedure, wherein the catalytic converter comprises a storage catalyst and an oxidation catalyst, and wherein means for the purpose of supplying air are provided upstream of the oxidation catalyst.
4. An internal combustion engine according to claim 3, wherein a pump is provided for the purpose of supplying air.
5. An internal combustion engine according to any of claims 3 or 4, wherein a valve, which can be controlled by a control device, is disposed upstream of the oxidation catalyst.
6. An internal combustion engine according to any of claims 3 to 5, wherein a non-return valve is disposed upstream of the oxidation catalyst.
7. A method for the purpose of operating an internal combustion engine, substantially as hereinbefore described with reference to the accompanying drawing.
8. An internal combustion engine, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
GB9819557A 1997-09-11 1998-09-09 Air supply to a catalytic converter Withdrawn GB2329131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19739847A DE19739847A1 (en) 1997-09-11 1997-09-11 Internal combustion engine, in particular for a motor vehicle

Publications (2)

Publication Number Publication Date
GB9819557D0 GB9819557D0 (en) 1998-10-28
GB2329131A true GB2329131A (en) 1999-03-17

Family

ID=7841947

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9819557A Withdrawn GB2329131A (en) 1997-09-11 1998-09-09 Air supply to a catalytic converter

Country Status (4)

Country Link
JP (1) JPH11148342A (en)
DE (1) DE19739847A1 (en)
FR (1) FR2768176A1 (en)
GB (1) GB2329131A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19957184A1 (en) * 1999-11-27 2001-05-31 Volkswagen Ag Operating exhaust gas purification device comprises operating engine in rich operating mode with reduction catalyst and oxidation catalyst and adjusting secondary air pump to specified lambda value
DE10047809B4 (en) * 2000-09-27 2014-01-09 Volkswagen Ag Method for operating control of a secondary air pump and emission control system with a secondary air pump
DE102004052063A1 (en) * 2004-10-26 2006-04-27 Volkswagen Ag Waste gas purification device in internal-combustion engines which are adjust in lambda proportion by a nitrogen oxide accumulator catalyst and a source of fresh air, comprises an exhaust gas stream is fixed on oxidation catalyst

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5319928A (en) * 1991-12-19 1994-06-14 Robert Bosch Gmbh Method and arrangement for controlling the operation of a secondary air pump
US5425235A (en) * 1992-07-21 1995-06-20 Mitsubishi Denki Kabushiki Kaisha Apparatus for purifying engine exhaust gas
US5442911A (en) * 1993-02-11 1995-08-22 Audi Ag Exhaust gas aftertreatment equipment for an internal combustion engine
US5577383A (en) * 1991-09-20 1996-11-26 Hitachi, Ltd. Apparatus for controlling internal combustion engine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3246086B2 (en) * 1993-06-11 2002-01-15 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
DE4434835A1 (en) * 1993-10-07 1995-04-13 Volkswagen Ag Exhaust system
JP3624429B2 (en) * 1994-02-28 2005-03-02 株式会社日立製作所 Control device for internal combustion engine
DE4445971A1 (en) * 1994-12-22 1996-06-27 Bosch Gmbh Robert Secondary air supply control process for IC engine
DE19543219C1 (en) * 1995-11-20 1996-12-05 Daimler Benz Ag Diesel engine operating method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5577383A (en) * 1991-09-20 1996-11-26 Hitachi, Ltd. Apparatus for controlling internal combustion engine
US5319928A (en) * 1991-12-19 1994-06-14 Robert Bosch Gmbh Method and arrangement for controlling the operation of a secondary air pump
US5425235A (en) * 1992-07-21 1995-06-20 Mitsubishi Denki Kabushiki Kaisha Apparatus for purifying engine exhaust gas
US5442911A (en) * 1993-02-11 1995-08-22 Audi Ag Exhaust gas aftertreatment equipment for an internal combustion engine

Also Published As

Publication number Publication date
JPH11148342A (en) 1999-06-02
FR2768176A1 (en) 1999-03-12
DE19739847A1 (en) 1999-04-15
GB9819557D0 (en) 1998-10-28

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