US20030136114A1 - Method of operating an internal combustion engine in particular in a motor vehicle - Google Patents

Method of operating an internal combustion engine in particular in a motor vehicle Download PDF

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Publication number
US20030136114A1
US20030136114A1 US10/169,169 US16916902A US2003136114A1 US 20030136114 A1 US20030136114 A1 US 20030136114A1 US 16916902 A US16916902 A US 16916902A US 2003136114 A1 US2003136114 A1 US 2003136114A1
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US
United States
Prior art keywords
catalytic converter
oxygen concentration
nitrogen oxides
downstream
o2free
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.)
Abandoned
Application number
US10/169,169
Other languages
English (en)
Inventor
Eberhard Schnaibel
Andreas Koring
Holger Bellmann
Thomas Wahl
Andreas Blumenstock
Klaus Winkler
Frank Stanglmeier
Bernd Schumann
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
Individual
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 Individual filed Critical Individual
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BELLMANN, HOLGER, SCHNAIBEL, EBERHARD, STANGLMEIER, FRANK, WAHL, THOMAS, SCHUMANN, BERND, BLUMENSTOCK, ANDREAS, KORING, ANDREAS, WINKLER, KLAUS
Publication of US20030136114A1 publication Critical patent/US20030136114A1/en
Abandoned 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
    • F01N3/0807—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1408—Dithering techniques
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0811—NOx storage efficiency
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a method of operating an internal combustion engine of a motor vehicle in particular, a catalytic converter being exposed to nitrogen oxides, and the oxygen concentration being measured downstream from the catalytic converter.
  • the present invention also concerns a controller for an engine of a motor vehicle in particular as well as an engine for a motor vehicle in particular.
  • Such a method such a controller and such an engine are known, for example, with intake manifold injection, where fuel is injected into the intake manifold of the engine during the intake phase. Nitrogen oxides resulting from combustion of fuel are converted to nitrogen and oxygen in the catalytic converter.
  • the catalytic converter is known to be subject to aging, which causes a decline in conversion capacity.
  • a method of the type defined above is also known for an internal combustion engine having direct injection.
  • fuel is injected directly into the combustion chamber of the engine during the intake phase.
  • the resulting nitrogen oxides are optionally stored temporarily in the downstream catalytic converters and then converted to oxygen.
  • the object of the present invention is to create a method of operating an engine with which the aging of the catalytic converter is detectable.
  • This object is achieved by a method according to the present invention of the type defined in the preamble by increasing the nitrogen oxides supplied to the catalytic converter, and determining the conversion capacity of the catalytic converter from an increase in oxygen concentration downstream from the catalytic converter.
  • the object is achieved accordingly with a controller and an internal combustion engine of the type defined in the preamble.
  • the present invention is equally applicable with intake manifold injection and with an engine having direct fuel injection.
  • the required lambda probe for measuring the oxygen concentration downstream from the catalytic converter may also be used for other purposes, e.g., for controlling and/or regulating the engine, in particular for setpoint control, as it is known.
  • the oxygen concentration upstream from the catalytic converter is kept constant. This achieves the result that only the elevated nitrogen oxide concentrations result in an increase in oxygen concentration downstream from the catalytic converter.
  • the composition of the exhaust gas with respect to other components has no effect on the conclusion of catalytic converter conversion capacity according to the present invention.
  • the lambda value is kept constant upstream from the catalytic converter. This also results in that only the elevated nitrogen oxides result in an increase in oxygen concentration downstream from the catalytic converter. This greatly simplifies the method according to the present invention.
  • the measured oxygen concentration downstream from the catalytic converter represents the oxygen concentration released by the catalytic converter from the nitrogen oxides supplied. This allows an especially simple and effective method of determining the conversion capacity of the catalytic converter.
  • Implementation of the method according to the present invention in the form of a control element provided for a controller of an engine in a motor vehicle in particular is particularly important.
  • a program capable of running on a computer, in particular a microprocessor, and suitable for execution of the method according to the present invention is stored in the control element.
  • the present invention is implemented via a program stored in the control element so that this control element equipped with the program represents the present invention in the same manner as the method for whose execution the program is suitable.
  • An electric storage medium e.g., a read-only memory or a flash memory, may be used in particular as the control element.
  • FIGURE The sole FIGURE in the drawing shows a schematic illustration of an embodiment of an engine according to the present invention.
  • FIGURE shows an internal combustion engine 1 in a motor vehicle, where a piston 2 is movable back and forth in a cylinder 3 .
  • Cylinder 3 is equipped with a combustion chamber 4 , which is delimited by piston 2 , intake valve 5 , and exhaust valve 6 .
  • An intake manifold 7 is connected to intake valve 5 and an exhaust pipe 8 is connected to exhaust valve 6 .
  • An injector 9 is provided in intake manifold 7 .
  • a spark plug 10 protrudes into combustion chamber 4 in the area of intake valve 5 and exhaust valve 6 .
  • Fuel may be injected into intake manifold 7 through injector 9 .
  • the air/fuel mixture drawn in may be ignited in combustion chamber 4 by spark plug 10 .
  • a rotatable throttle valve 11 is accommodated in intake manifold 7 .
  • the amount of air supplied to combustion chamber 4 depends on the angular setting of throttle valve 11 .
  • a catalytic converter 12 is provided in exhaust pipe 8 to purify the exhaust gas generated by combustion of fuel.
  • Catalytic converter 12 is provided so that nitrogen oxides (NOx) may be converted to nitrogen and oxygen.
  • a continuous lambda probe 13 is provided in the exhaust pipe directly downstream from catalytic converter 12 and is suitable for measuring the free oxygen concentration O2free in the exhaust downstream from catalytic converter 12 .
  • a controller 18 receives input signals 19 which are operating variables of engine 1 measured by sensors. Controller 18 generates output signals 20 with which the performance of engine 1 may be influenced via actuators and controlling elements. Controller 18 is provided so that, among other things, the operating variables of engine 1 may be controlled and/or regulated. To this end, controller 18 is equipped with a microprocessor which has a program suitable for executing this control and/or regulation stored in a memory medium, in particular in a flash memory.
  • Nitrogen oxides (NOx) generated during operation of engine 1 are supplied to catalytic converter 12 . These nitrogen oxides are converted by catalytic converter 12 into nitrogen and oxygen. The ongoing conversion results in a diminished conversion capacity of catalytic converter 12 ; this is referred to hereinafter as aging.
  • Free oxygen concentration O2free downstream from catalytic converter 12 is composed of oxygen concentration O2Exhaust in the exhaust gas downstream from catalytic converter 12 and oxygen concentration O2Cat released from the nitrogen oxide feed by catalytic converter 12 .
  • Concentration O2Exhaust is in the per mill range, and concentration O2Cat is approximately in the ppm range.
  • Oxygen concentration O2Exhaust in the exhaust gas downstream from catalytic converter 12 depends on the oxygen concentration upstream from the catalytic converter and thus on the lambda value upstream from catalytic converter 12 .
  • the oxygen concentration upstream from catalytic converter 12 and thus the lambda value upstream from catalytic converter 12 are kept constant.
  • the oxygen concentration O2Exhaust in the exhaust gas downstream from catalytic converter 12 is therefore constant.
  • the concentration or number of nitrogen oxides upstream from catalytic converter 12 is increased. This may be accomplished, for example, by detuning the ignition time of individual cylinders or by similar measures.
  • Increased free oxygen concentration O2free downstream from catalytic converter 12 is measured by continuous lambda probe 13 downstream from catalytic converter 12 . Since oxygen concentration O2Exhaust in the exhaust gas downstream from catalytic converter 12 is kept constant, increased free oxygen concentration O2free measured by lambda probe 13 represents directly the increase in oxygen concentration O2Cat released from the nitrogen oxide feed by catalytic converter 12 .
  • controller 18 controls the diagnostic method described above at preselected intervals in time and/or on the basis of preselected events. This results in a series of successive measurement results for increased concentration O2free representing the increase in concentration O2Cat, as stated above.
  • controller 18 concludes the conversion capacity and thus the aging of catalytic converter 12 on the basis of the individual measurement results and the curve of successive measurement results for concentration O2free. This is achieved, for example, by monitoring the change in concentration O2free. It is likewise possible to monitor the absolute values of concentration O2free and to compare them with the values of a new catalytic converter, for example. All these comparisons may be performed by controller 18 either individually or in combination. Thus, on the whole, it is possible for controller 18 to conclude the aging or aging condition of catalytic converter 12 . If this aging exceeds a preselected threshold value, this is indicated to the operator of engine 1 by controller 18 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
US10/169,169 1999-12-31 2000-12-23 Method of operating an internal combustion engine in particular in a motor vehicle Abandoned US20030136114A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19963936A DE19963936A1 (de) 1999-12-31 1999-12-31 Verfahren zum Betreiben einer Brennkraftmaschine insbesondere eines Kraftfahrzeugs
DE199-63-936.1 1999-12-31

Publications (1)

Publication Number Publication Date
US20030136114A1 true US20030136114A1 (en) 2003-07-24

Family

ID=7935102

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/169,169 Abandoned US20030136114A1 (en) 1999-12-31 2000-12-23 Method of operating an internal combustion engine in particular in a motor vehicle

Country Status (7)

Country Link
US (1) US20030136114A1 (fr)
EP (1) EP1264094A2 (fr)
JP (1) JP2003519316A (fr)
KR (1) KR20030007391A (fr)
CN (1) CN1415050A (fr)
DE (1) DE19963936A1 (fr)
WO (1) WO2001049983A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040118376A1 (en) * 2002-12-12 2004-06-24 Denso Corporation Control apparatus for internal combustion engine having adapting function to aging
US20120173163A1 (en) * 2009-09-11 2012-07-05 Robert Bosch Gmbh Probe plug for exhaust gas probe

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005032456A1 (de) * 2005-07-12 2007-01-25 Robert Bosch Gmbh Verfahren zur Dynamikdiagnose einer Abgassonde
US8635853B2 (en) * 2008-01-25 2014-01-28 Caterpillar Inc. Exhaust reduction system having oxygen and temperature control
CN102322325B (zh) * 2011-08-11 2013-03-06 潍柴动力股份有限公司 发动机及其降低发动机氮氧化合物的排放量的装置
DE102014208915A1 (de) * 2014-05-12 2015-11-12 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine eines Kraftfahrzeugs im Schubbetrieb bei niedrigen Emissionen und geringem Kraftstoffverbrauch
US9435244B1 (en) * 2015-04-14 2016-09-06 General Electric Company System and method for injection control of urea in selective catalyst reduction

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6035632A (en) * 1998-08-18 2000-03-14 Chrysler Corporation Step response catalyst monitoring

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DE4009901A1 (de) * 1990-03-28 1991-10-02 Bosch Gmbh Robert Verfahren und vorrichtung zur ueberwachung des konvertierungsgrades eines katalysators im abgassystem einer brennkraftmaschine
US5357750A (en) * 1990-04-12 1994-10-25 Ngk Spark Plug Co., Ltd. Method for detecting deterioration of catalyst and measuring conversion efficiency thereof with an air/fuel ratio sensor
DE69420488T2 (de) * 1993-01-19 2000-04-13 Toyota Motor Co Ltd Abgasreinigungsgerät für eine brennkraftmaschine
JP3228006B2 (ja) * 1994-06-30 2001-11-12 トヨタ自動車株式会社 内燃機関の排気浄化要素劣化検出装置
DE19801625A1 (de) * 1998-01-17 1999-07-22 Bosch Gmbh Robert Diagnose eines NOx-Speicherkatalysators beim Betrieb von Verbrennungsmotoren
DE19801626B4 (de) * 1998-01-17 2010-08-12 Robert Bosch Gmbh Diagnose eines NOx-Speicherkatalysators beim Betrieb von Verbrennungsmotoren
JP2000018062A (ja) * 1998-04-27 2000-01-18 Denso Corp 内燃機関の空燃比制御装置
DE19819461B4 (de) * 1998-04-30 2004-07-01 Siemens Ag Verfahren zur Abgasreinigung mit Trimmregelung
DE19823923C2 (de) * 1998-05-28 2003-04-17 Siemens Ag Verfahren zur Stickoxidreduzierung im Abgas einer Brennkraftmaschine
DE19828928C2 (de) * 1998-06-29 2003-04-17 Siemens Ag Verfahren zur Überwachung des Abgasreinigungssystems einer Brennkraftmaschine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6035632A (en) * 1998-08-18 2000-03-14 Chrysler Corporation Step response catalyst monitoring

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040118376A1 (en) * 2002-12-12 2004-06-24 Denso Corporation Control apparatus for internal combustion engine having adapting function to aging
US20120173163A1 (en) * 2009-09-11 2012-07-05 Robert Bosch Gmbh Probe plug for exhaust gas probe
US9234869B2 (en) * 2009-09-11 2016-01-12 Robert Bosch Gmbh Data storing exhaust gas probe

Also Published As

Publication number Publication date
WO2001049983A3 (fr) 2002-02-14
CN1415050A (zh) 2003-04-30
EP1264094A2 (fr) 2002-12-11
KR20030007391A (ko) 2003-01-23
JP2003519316A (ja) 2003-06-17
WO2001049983A2 (fr) 2001-07-12
DE19963936A1 (de) 2001-07-12

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AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHNAIBEL, EBERHARD;KORING, ANDREAS;BELLMANN, HOLGER;AND OTHERS;REEL/FRAME:013503/0334;SIGNING DATES FROM 20020729 TO 20020905

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION