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EP2652281A1 - Method and device for carrying out a zero point adaptation of a lambda probe of an internal combustion engine - Google Patents

Method and device for carrying out a zero point adaptation of a lambda probe of an internal combustion engine

Info

Publication number
EP2652281A1
EP2652281A1 EP11790628.9A EP11790628A EP2652281A1 EP 2652281 A1 EP2652281 A1 EP 2652281A1 EP 11790628 A EP11790628 A EP 11790628A EP 2652281 A1 EP2652281 A1 EP 2652281A1
Authority
EP
European Patent Office
Prior art keywords
lambda probe
fresh air
internal combustion
exhaust gas
pump
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Withdrawn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
EP11790628.9A
Other languages
German (de)
French (fr)
Inventor
Dirk Bader
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 EP2652281A1 publication Critical patent/EP2652281A1/en
Withdrawn legal-status Critical Current

Links

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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • 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
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/02—Drives of pumps; Varying pump drive gear ratio
    • F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
    • F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
    • G01N27/4175—Calibrating or checking the analyser
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • 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
    • F02D41/1402—Adaptive control
    • 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
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2441—Methods of calibrating or learning characterised by the learning 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2454—Learning of the air-fuel ratio control
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2474—Characteristics of sensors
    • 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
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to internal combustion engines, which have a lambda probe in the exhaust system for controlling the air / fuel ratio.
  • the invention further relates to a method and a device for performing a zero point adaptation of the lambda probe.
  • the lambda probe measures the residual oxygen content in the combustion exhaust gas and is used in a control that regulates the ratio of fresh air to fuel of the air / fuel mixture supplied to the cylinders to a desired value by adjusting the amount of fuel to be injected into the cylinders.
  • the lambda probes commonly used are subject to drift due to aging and the high temperature load, so that repeated alignment of the lambda probe must be performed.
  • the electrical quantity (voltage) provided by the lambda probe is assigned to a specific oxygen concentration of the gas flowing past the lambda probe, and a correction factor is determined with which the dependence between the electrical quantity and the oxygen concentration can be calibrated. Since it is usually difficult to provide a defined air / fuel ratio in the cylinders without feedback from a lambda probe, an operating state is usually provided for this, in which fresh air is conducted past the lambda probe.
  • the oxygen concentration of fresh air is about 21 vol .-% and is thus known, so that a clear assignment of this measuring point of the lambda probe is possible.
  • Fresh air is passed without injecting fuel through the cylinders of the internal combustion engine.
  • the overrun operation occurs when a driver of the motor vehicle releases the accelerator pedal and the motor is dragged along by the inertia of the vehicle without it generating its own torque. With the function of the intake and exhaust valves unchanged, fresh air then reaches the lambda probe after a few working cycles, so that the zero point adaptation can be carried out.
  • a method for performing a zero point adaptation of a lambda probe in an exhaust gas removal section of an internal combustion engine, wherein fresh air is pumped from an air supply system into the Abgasab Results during a follow-up phase after a shutdown of the internal combustion engine, so that the lambda probe is surrounded by fresh air
  • One idea of the above method is to use existing or additional pumps in an engine system to run in a trailing phase, i. H. After switching off the internal combustion engine and before switching off the control unit, make sure that the lambda probe is flushed with fresh air. The zero point adaptation of the lambda probe can then be carried out according to known methods.
  • the follow-up phase can follow a complete standstill of the internal combustion engine.
  • the duration of the trailing phase can be limited in time and take at least as long until the lambda probe is surrounded by fresh air.
  • a zero point adaptation of the lambda probe can be carried out as soon as the lambda probe is surrounded by fresh air.
  • an engine system in another aspect, includes:
  • an internal combustion engine to which fresh air can be supplied via an air supply system and which can be discharged from the combustion exhaust gas via an exhaust gas removal section;
  • a lambda probe disposed in the exhaust discharge section; a pump for pumping fresh air from the air supply system to the exhaust discharge section;
  • a control unit to control the pump during a follow-up phase after a shutdown of the internal combustion engine to pump fresh air into the Abgasab Resultssabites so that the lambda probe is surrounded by fresh air.
  • the pump may be arranged in a line which connects the air supply system with the Abgasab arrangementsabites.
  • the pump may correspond to an exhaust gas recirculation pump in an exhaust gas recirculation line, wherein the exhaust gas recirculation pump is controllable in order to pump combustion exhaust gas into the air supply system, in particular into a suction pipe section, and in the after-run phase in a reverse operation, in the fresh air in the
  • the pump can be arranged in a fresh air line which discharges from the air supply system in a region upstream of a compressor of a turbocharger and opens into the exhaust gas removal section in the region of the lambda probe or upstream thereof.
  • the pump may correspond to a turbocharger compressor operable independently of the internal combustion engine in the air supply system.
  • control unit is designed to perform a zero point adaptation of the lambda probe when the lambda probe is surrounded by fresh air.
  • FIG. 1 is a schematic representation of an engine system with an internal combustion engine according to a first embodiment
  • FIG. 2 is a flow chart illustrating the method of performing zero point adaptation based on the embodiment of FIG. 1;
  • FIG. 3 shows a schematic representation of a further embodiment of an engine system for carrying out a
  • FIG. 4 shows a schematic representation of a further embodiment of an engine system for carrying out a zero point adaptation of the lambda probe.
  • FIG. 1 shows an engine system 1 with an internal combustion engine 2, to which air is supplied via an air supply system 3 and is discharged from the combustion exhaust gas via an exhaust gas removal section 4.
  • the air supply system 3 comprises a suction port 5 through which ambient air is drawn in, an air filter 6 which filters and cleans the sucked-in ambient air of particles, and a compressor 7 for compressing the sucked and filtered fresh air.
  • the compressor 7 is in the embodiment of Figure 1 part of an exhaust gas turbocharger 8. Downstream of the compressor 7, a charge air cooler 10 is provided to cool the compressed fresh air which has been heated by the compression.
  • the amount of the internal combustion engine 2 supplied fresh air can be adjusted.
  • fuel can be injected either in a Saugrohrabites 12 of the air supply system 3 or directly into the cylinder 13 of the engine 2 to operate it.
  • the exhaust gas discharge portion 4 discharges the combustion exhaust gases from the engine 2 generated by combustion of the air-fuel mixture according to a conventional four-stroke operation.
  • a turbine 15 of the exhaust gas turbocharger 8 is arranged, which is mechanically coupled to the compressor 7 in the air supply system 3.
  • the exhaust gas turbine 15 uses the exhaust gas enthalpy of the combustion exhaust gas and converts it into a compressor power for the compressor 7.
  • an exhaust gas recirculation line 9 in which an exhaust gas recirculation valve 23 is provided to supply combustion exhaust gas as an inert gas to the suction pipe section 12.
  • a lambda probe 16 is arranged in the exhaust gas removal section 4, with which the oxygen content of the combustion exhaust gas can be determined. Furthermore, a particulate filter 17 and a catalytic converter 18 can be arranged downstream of the lambda probe 16.
  • the operation of the internal combustion engine 2 is controlled by a control unit 20.
  • state variables of the engine system 1 which by suitable sensors, such.
  • a boost pressure sensor for detecting a boost pressure
  • a lambda probe for detecting a lambda value and the like, determined and / or modeled by system models, actuators, such.
  • a throttle valve actuator for setting the throttle, ignition timing of ignition devices in the cylinders of the internal combustion engine 2, the degree of rotation of the turbocharger 8 and the like, controlled to the internal combustion engine in the desired manner, d. H. to provide a desired drive torque to drive.
  • the lambda probe 16 is subject to considerable drift due to aging and temperature influences, so that a zero point adaptation of the lambda probe 16 must be made regularly.
  • the supply Order of the provided by the lambda probe 16 electrical quantity to the oxygen concentration corrected by a correction factor is determined by determining the electrical variable provided by the lambda probe 16 in the case of a lambda probe 16 surrounded by fresh air.
  • the operation of the internal combustion engine 2 and the zero point adaptation of the lambda probe 16 are performed in a control unit 20.
  • the lambda probe 16 In order to supply the lambda probe for the zero point adaptation with a gas with a previously known oxygen concentration, it has hitherto been provided to produce a state in which the lambda probe is flushed with fresh air. Since a coasting operation is not provided for engines in off-highway operation, the lambda probe 16 is therefore supplied fresh air in another way to perform the zero point adaptation can.
  • a branch is provided in the region of the air supply system 3, downstream of the air filter 6, through which fresh air is conducted directly into the region of the exhaust gas removal section 4 at or immediately upstream of the lambda probe 16.
  • the designated fresh air line 18 is provided with an air pump 19 which is activated to pump fresh air into the Abgasab Resultssabites 4, so that the lambda probe 16 is flushed with fresh air.
  • FIG. 2 shows a flowchart for illustrating the method carried out for this purpose.
  • step S1 it is determined in step S1 whether the engine system 1 is turned off. If this is the case (alternative: yes), then in Step S2 determines whether the internal combustion engine has come to a standstill, otherwise (alternative: No) the query of step S1 is repeated.
  • step S3 If it is determined in step S2 that the internal combustion engine 2 has come to a standstill and is no longer moving (alternative: yes), then step S3 is continued, otherwise, in step S2, the system waits until the stationary state of the internal combustion engine 2 has been reached.
  • the control unit 20 continues to operate even after the engine 2 is turned off, and controls the air pump 19 in a follow-up phase beginning with the stop of the engine 2 (step S3) to introduce fresh air into the exhaust discharge portion 4 so that the lambda - Probe 16 is lapped by fresh air.
  • the duration of the follow-up phase is determined in such a way that it is ensured that the lambda probe is sufficiently bathed in fresh air in order to be able to carry out the zero-point adaptation.
  • step S4 the zero point adaptation of the lambda probe 16 can be carried out based on the oxygen content of fresh air, as is known from the prior art.
  • a lambda value (voltage at the lambda probe) is measured for an oxygen concentration of 21% by volume of the fresh air and from this a correction factor and, if necessary, a correction offset for the assignment function (usually approximately linear) of the lambda value to the actual oxygen concentration certainly.
  • FIG. 3 shows a further embodiment of an engine system 30.
  • the engine system 30 of FIG. 3 largely corresponds to the engine system of FIG. 1.
  • an electrically operated turbocharger with a turbocharger drive 21 is provided which drives the compressor 7.
  • the fresh air can be passed through the return line 9 and an open exhaust gas recirculation valve 23 into the Abgasab Resultssabites 4.
  • There- by the lambda probe 16 can also be lapped with fresh air.
  • the turbocharger drive 21 is, as described above, put into operation in the follow-up phase of the engine system 1 or in operation, so that this fresh air is compressed and this provides upstream of the compressor 7.
  • the operation of the turbocharger drive 21 is maintained as long as possible until the lambda probe 16 is now reliably flushed with fresh air.
  • the embodiment of Figure 4 shows a further variant of an engine system 40, in which also the fresh air line 18 and the air pump 19 can be dispensed with.
  • the embodiment of Figure 4 relates to engine systems in which instead of an exhaust gas recirculation valve or in addition to the exhaust gas recirculation valve, an exhaust gas recirculation pump 25 is provided in the exhaust gas recirculation line 9.
  • the exhaust gas recirculation pump 25 serves to actively pump exhaust gas into the air supply system 3 during normal operation of the internal combustion engine 2.
  • the exhaust gas recirculation pump 25 can be operated in reverse operation, so that fresh air can be pumped from the air supply system 3 into the exhaust gas removal section 4. In this way it is possible to dispense with the air pump 19 and the fresh air line 18 and to use the existing exhaust gas recirculation pump 25 additionally for the zero point adaptation of the lambda probe 16.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Toxicology (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to a method for carrying out a zero point adaptation of a lambda probe (16) in an exhaust gas discharge section (4) of an internal combustion engine (2), wherein fresh air is pumped, during an after-run period following a deactivation of the internal combustion engine (2), from an air supply system (3) into the exhaust gas discharge section (4) such that fresh air flows around the lambda probe (16).

Description

Beschreibung  description
Verfahren und Vorrichtung zum Durchführen einer Nullpunktadaption einer Lambdasonde eines Verbrennungsmotors Method and apparatus for performing a zero point adaptation of a lambda probe of an internal combustion engine
Technisches Gebiet Technical area
Die Erfindung betrifft Verbrennungsmotoren, die im Abgasstrang zur Regelung des Luft-/Kraftstoffverhältnisses eine Lambdasonde aufweisen. Die Erfindung betrifft weiterhin ein Verfahren und eine Vorrichtung zum Durchführen einer Nullpunktadaption der Lambdasonde. The invention relates to internal combustion engines, which have a lambda probe in the exhaust system for controlling the air / fuel ratio. The invention further relates to a method and a device for performing a zero point adaptation of the lambda probe.
Stand der Technik State of the art
Es ist bekannt, Verbrennungsmotoren, insbesondere Ottomotoren, im Abgasstrang mit einer Lambdasonde zu versehen, um das Luft-/Kraftstoffverhältnis zu ermitteln, das zum Zeitpunkt der Verbrennung in den Zylindern vorgelegen hat. Die Lambdasonde misst den Restsauerstoffgehalt in dem Verbrennungsabgas und wird in einer Regelung eingesetzt, die das Verhältnis von Frischluft zu Kraftstoff des den Zylindern zugeführten Luft-/Kraftstoffgemisches auf einen gewünschten Wert regelt, indem die in die Zylinder einzuspritzende Kraftstoffmenge eingestellt wird. It is known to provide internal combustion engines, in particular gasoline engines, in the exhaust system with a lambda probe to determine the air / fuel ratio, which was present at the time of combustion in the cylinders. The lambda probe measures the residual oxygen content in the combustion exhaust gas and is used in a control that regulates the ratio of fresh air to fuel of the air / fuel mixture supplied to the cylinders to a desired value by adjusting the amount of fuel to be injected into the cylinders.
Die üblicherweise verwendeten Lambdasonden unterliegen aufgrund der Alterung und der hohen Temperaturbelastung einer Drift, so dass wiederholt ein Abgleich der Lambdasonde durchgeführt werden muss. Bei diesem Abgleich wird die von der Lambdasonde bereitgestellte elektrische Größe (Spannung) einer bestimmten Sauerstoffkonzentration des an der Lambdasonde vorbei strömenden Gases zugeordnet und es wird ein Korrekturfaktor bestimmt, mit dem die Abhängigkeit zwischen der elektrischen Größe und der Sauerstoffkonzentration kalibriert werden kann. Da es ohne Rückmeldung einer Lambdasonde in der Regel schwierig ist, ein festgelegtes Luft-/Kraftstoffverhältnis in den Zylindern bereitzustellen, wird dafür üblicherweise ein Betriebszustand vorgesehen, bei dem Frischluft an der Lamb- dasonde vorbei geführt wird. Die Sauerstoffkonzentration von Frischluft liegt bei etwa 21 Vol.-% und ist somit bekannt, so dass eine eindeutige Zuordnung dieses Messpunktes der Lambdasonde möglich ist. The lambda probes commonly used are subject to drift due to aging and the high temperature load, so that repeated alignment of the lambda probe must be performed. In this adjustment, the electrical quantity (voltage) provided by the lambda probe is assigned to a specific oxygen concentration of the gas flowing past the lambda probe, and a correction factor is determined with which the dependence between the electrical quantity and the oxygen concentration can be calibrated. Since it is usually difficult to provide a defined air / fuel ratio in the cylinders without feedback from a lambda probe, an operating state is usually provided for this, in which fresh air is conducted past the lambda probe. The oxygen concentration of fresh air is about 21 vol .-% and is thus known, so that a clear assignment of this measuring point of the lambda probe is possible.
In herkömmlichen Verbrennungsmotoren, die in Kraftfahrzeugen eingesetzt sind, ist in der Regel als Betriebszustand ein Schubbetrieb vorgesehen, bei demIn conventional internal combustion engines, which are used in motor vehicles, as a rule an overrun operation is provided, in which
Frischluft ohne Einspritzen von Kraftstoff durch die Zylinder des Verbrennungsmotors geleitet wird. Der Schubbetrieb tritt auf, wenn ein Fahrer des Kraftfahrzeugs das Fahrpedal loslässt und der Motor durch die Massenträgheit des Fahrzeugs mitgeschleppt wird, ohne dass dieser ein eigenes Drehmoment generiert. Bei unveränderter Funktion der Einlass- und Auslassventile gelangt dann nach wenigen Arbeitsspielen Frischluft an die Lambdasonde, so dass die Nullpunktadaption durchgeführt werden kann. Fresh air is passed without injecting fuel through the cylinders of the internal combustion engine. The overrun operation occurs when a driver of the motor vehicle releases the accelerator pedal and the motor is dragged along by the inertia of the vehicle without it generating its own torque. With the function of the intake and exhaust valves unchanged, fresh air then reaches the lambda probe after a few working cycles, so that the zero point adaptation can be carried out.
Bei Verbrennungsmotoren, die in einem so genannten Off-Highway-Betrieb be- trieben werden, wie beispielsweise Verbrennungsmotoren zum Antrieb von Generatoren, Landmaschinen, Werkzeugmaschinen und dergleichen, ist ein Schubbetrieb nicht vorgesehen, da keine ausreichende bewegliche Masse vorhanden ist, um den Verbrennungsmotor zu schleppen. Somit entfällt der Betriebszustand des Schubbetriebs, in dem die Nullpunktadaption der Lambdasonde durchgeführt werden kann. In internal combustion engines operating in so-called off-highway operation, such as internal combustion engines for driving generators, agricultural machines, machine tools, and the like, coasting is not provided because sufficient movable mass is not available to the engine hauling. Thus eliminates the operating state of the overrun operation, in which the zero point adaptation of the lambda probe can be performed.
Es ist daher Aufgabe der vorliegenden Erfindung, ein Verfahren zum Durchführen einer Nullpunktadaption von Verbrennungsmotoren im Off-Highway-Betrieb sowie ein entsprechendes Motorsystem zur Verfügung zu stellen, bei dem die Nullpunktadaption der Lambdasonde in einfacher Weise bereitgestellt werden kann. It is therefore an object of the present invention to provide a method for performing a zero point adaptation of internal combustion engines in off-highway operation and a corresponding engine system in which the zero point adaptation of the lambda probe can be provided in a simple manner.
Offenbarung der Erfindung Diese Aufgabe wird durch das Verfahren zum Durchführen einer Nullpunktadaption für eine Lambdasonde eines Motorsystems mit einem Verbrennungsmotor gemäß Anspruch 1 sowie durch das Motorsystem gemäß dem nebengeordneten Anspruch gelöst. Disclosure of the Invention This object is achieved by the method of performing a zero point adaptation for a lambda probe of an engine system with an internal combustion engine according to claim 1 and solved by the motor system according to the independent claim.
Weitere vorteilhafte Ausgestaltungen sind in den abhängigen Ansprüchen angegeben. Further advantageous embodiments are specified in the dependent claims.
Gemäß einem ersten Aspekt ist ein Verfahren zum Durchführen einer Nullpunktadaption einer Lambdasonde in einem Abgasabführungsabschnitt eines Verbrennungsmotors vorgesehen, wobei während einer Nachlaufphase nach einem Abschalten des Verbrennungsmotors Frischluft von einem Luftzuführungssystem in den Abgasabführungsabschnitt gepumpt wird, so dass die Lambdasonde von Frischluft umspült wird According to a first aspect, a method is provided for performing a zero point adaptation of a lambda probe in an exhaust gas removal section of an internal combustion engine, wherein fresh air is pumped from an air supply system into the Abgasabführungsabschnitt during a follow-up phase after a shutdown of the internal combustion engine, so that the lambda probe is surrounded by fresh air
Eine Idee des obigen Verfahrens besteht darin, vorhandene oder zusätzliche Pumpen in einem Motorsystem zu nutzen, um in einer Nachlaufphase, d. h. nach dem Abschalten des Verbrennungsmotors und vor dem Abschalten des Steuergeräts, dafür zu sorgen, dass die Lambdasonde mit Frischluft umspült wird. Die Nullpunktadaption der Lambdasonde kann dann gemäß bekannten Verfahren durchgeführt werden. One idea of the above method is to use existing or additional pumps in an engine system to run in a trailing phase, i. H. After switching off the internal combustion engine and before switching off the control unit, make sure that the lambda probe is flushed with fresh air. The zero point adaptation of the lambda probe can then be carried out according to known methods.
Weiterhin kann sich die Nachlaufphase an einen vollständigen Stillstand des Verbrennungsmotors anschließen. Insbesondere kann die Dauer der Nachlaufphase zeitlich begrenzt sein und mindestens so lange dauern, bis die Lambdasonde von Frischluft umspült ist. Furthermore, the follow-up phase can follow a complete standstill of the internal combustion engine. In particular, the duration of the trailing phase can be limited in time and take at least as long until the lambda probe is surrounded by fresh air.
Gemäß einer weiteren Ausführungsform kann eine Nullpunktadaption der Lambdasonde durchgeführt werden, sobald die Lambdasonde von Frischluft umspült ist. According to a further embodiment, a zero point adaptation of the lambda probe can be carried out as soon as the lambda probe is surrounded by fresh air.
Gemäß einem weiteren Aspekt ist ein Motorsystem vorgesehen. Das Motorsystem umfasst: In another aspect, an engine system is provided. The engine system includes:
- einen Verbrennungsmotor, dem Frischluft über ein Luftzuführungssystem zuführbar und von dem Verbrennungsabgas über einen Abgasabführungsabschnitt abführbar ist;  an internal combustion engine, to which fresh air can be supplied via an air supply system and which can be discharged from the combustion exhaust gas via an exhaust gas removal section;
- eine Lambdasonde, die in dem Abgasabführungsabschnitt angeordnet ist; - eine Pumpe, um Frischluft von dem Luftzuführungssystem zu dem Abgasabführungsabschnitt zu pumpen; a lambda probe disposed in the exhaust discharge section; a pump for pumping fresh air from the air supply system to the exhaust discharge section;
- eine Steuereinheit, um während einer Nachlaufphase nach einem Abschalten des Verbrennungsmotors die Pumpe anzusteuern, um Frischluft in den Abgasabführungsabschnitt zu pumpen, so dass die Lambdasonde von Frischluft umspült wird.  - A control unit to control the pump during a follow-up phase after a shutdown of the internal combustion engine to pump fresh air into the Abgasabführungsabschnitt so that the lambda probe is surrounded by fresh air.
Weiterhin kann die Pumpe in einer Leitung angeordnet sein, die das Luftzuführungssystem mit dem Abgasabführungsabschnitt verbindet. Furthermore, the pump may be arranged in a line which connects the air supply system with the Abgasabführungsabschnitt.
Insbesondere kann die Pumpe einer Abgasrückführungspumpe in einer Abgasrückführungsleitung entsprechen, wobei die Abgasrückführungspumpe ansteuerbar ist, um im Normalbetrieb Verbrennungsabgas in das Luftzuführungssystem, insbesondere in einen Saugrohrabschnitt, zu pumpen, und um in der Nachlauf- phase in einem Umkehrbetrieb betrieben zu werden, bei dem Frischluft in denIn particular, the pump may correspond to an exhaust gas recirculation pump in an exhaust gas recirculation line, wherein the exhaust gas recirculation pump is controllable in order to pump combustion exhaust gas into the air supply system, in particular into a suction pipe section, and in the after-run phase in a reverse operation, in the fresh air in the
Abgasabführungsabschnitt geleitet wird. Exhaust gas discharge section is passed.
Gemäß einer weiteren Ausführungsform kann die Pumpe in einer Frischluftleitung angeordnet sein, die in einem Bereich vor einem Kompressor eines Turbo- laders von dem Luftzuführungssystem abführt und im Bereich der Lambdasonde oder stromaufwärts davon in den Abgasabführungsabschnitt mündet. According to a further embodiment, the pump can be arranged in a fresh air line which discharges from the air supply system in a region upstream of a compressor of a turbocharger and opens into the exhaust gas removal section in the region of the lambda probe or upstream thereof.
Weiterhin kann die Pumpe einem von dem Verbrennungsmotor unabhängig betreibbaren Kompressor eines Turboladers in dem Luftzuführungssystem entsprechen. Furthermore, the pump may correspond to a turbocharger compressor operable independently of the internal combustion engine in the air supply system.
Es kann vorgesehen sein, dass die Steuereinheit ausgebildet ist, um eine Nullpunktadaption der Lambdasonde durchzuführen, wenn die Lambdasonde von Frischluft umspült ist. It may be provided that the control unit is designed to perform a zero point adaptation of the lambda probe when the lambda probe is surrounded by fresh air.
Kurzbeschreibung der Zeichnungen Brief description of the drawings
Bevorzugte Ausführungsformen der vorliegenden Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Es zeigen: Figur 1 eine schematische Darstellung eines Motorsystems mit einem Verbrennungsmotor gemäß einer ersten Ausführungsform; Figur 2 ein Flussdiagramm zur Veranschaulichung des Verfahrens zum Durchführen der Nullpunktadaption basierend auf der Ausführungsform der Figur 1 ; Preferred embodiments of the present invention will be explained in more detail with reference to the accompanying drawings. Show it: Figure 1 is a schematic representation of an engine system with an internal combustion engine according to a first embodiment; FIG. 2 is a flow chart illustrating the method of performing zero point adaptation based on the embodiment of FIG. 1;
Figur 3 eine schematische Darstellung einer weiteren Ausfüh- rungsform eines Motorsystems zum Durchführen einerFIG. 3 shows a schematic representation of a further embodiment of an engine system for carrying out a
Nullpunktadaption der Lambdasonde; und Zero point adaptation of the lambda probe; and
Figur 4 eine schematische Darstellung einer weiteren Ausführungsform eines Motorsystems zum Durchführen einer Nullpunktadaption der Lambdasonde. FIG. 4 shows a schematic representation of a further embodiment of an engine system for carrying out a zero point adaptation of the lambda probe.
Beschreibung von Ausführungsformen Description of embodiments
Figur 1 zeigt ein Motorsystem 1 mit einem Verbrennungsmotor 2, dem Luft über ein Luftzuführungssystem 3 zugeführt und von dem Verbrennungsabgas über einen Abgasabführungsabschnitt 4 abgeführt wird. FIG. 1 shows an engine system 1 with an internal combustion engine 2, to which air is supplied via an air supply system 3 and is discharged from the combustion exhaust gas via an exhaust gas removal section 4.
Das Luftzuführungssystem 3 umfasst eine Ansaugöffnung 5, über die Umgebungsluft eingesaugt wird, einen Luftfilter 6, der die eingesaugte Umgebungsluft filtert und von Partikeln reinigt, sowie einen Kompressor 7, um die angesaugte und gefilterte Frischluft zu komprimieren. Der Kompressor 7 ist in der Ausführungsform der Figur 1 Teil eines Abgasturboladers 8. Stromabwärts des Kompressors 7 ist ein Ladeluftkühler 10 vorgesehen, um die komprimierte Frischluft, die sich durch die Kompression erwärmt hat, zu kühlen. The air supply system 3 comprises a suction port 5 through which ambient air is drawn in, an air filter 6 which filters and cleans the sucked-in ambient air of particles, and a compressor 7 for compressing the sucked and filtered fresh air. The compressor 7 is in the embodiment of Figure 1 part of an exhaust gas turbocharger 8. Downstream of the compressor 7, a charge air cooler 10 is provided to cool the compressed fresh air which has been heated by the compression.
Mithilfe einer Drosselklappe 11 kann die Menge der dem Verbrennungsmotor 2 zugeführten Frischluft eingestellt werden. Im vorliegenden Motorsystem 1 kann Kraftstoff entweder in einem Saugrohrabschnitt 12 des Luftzuführungssystems 3 oder direkt in die Zylinder 13 des Verbrennungsmotors 2 eingespritzt werden, um diesen zu betreiben. Der Abgasabführungsabschnitt 4 leitet die Verbrennungsabgase aus dem Verbrennungsmotor 2 ab, die dieser gemäß einem herkömmlichen Viertaktbetrieb durch Verbrennen des Luft-/Kraftstoffgemischs erzeugt hat. In dem Abgasabführungsabschnitt 4 ist eine Turbine 15 des Abgasturboladers 8 angeordnet, die mit dem Kompressor 7 im Luftzuführungssystem 3 mechanisch gekoppelt ist. Die Abgasturbine 15 nutzt die Abgasenthalpie des Verbrennungsabgases und setzt diese in eine Kompressorleistung für den Kompressor 7 um. By means of a throttle valve 11, the amount of the internal combustion engine 2 supplied fresh air can be adjusted. In the present engine system 1 fuel can be injected either in a Saugrohrabschnitt 12 of the air supply system 3 or directly into the cylinder 13 of the engine 2 to operate it. The exhaust gas discharge portion 4 discharges the combustion exhaust gases from the engine 2 generated by combustion of the air-fuel mixture according to a conventional four-stroke operation. In the Abgasabführungsabschnitt 4, a turbine 15 of the exhaust gas turbocharger 8 is arranged, which is mechanically coupled to the compressor 7 in the air supply system 3. The exhaust gas turbine 15 uses the exhaust gas enthalpy of the combustion exhaust gas and converts it into a compressor power for the compressor 7.
Zwischen dem Saugrohrabschnitt 12 und dem Teil des Abgasabführungsabschnitts 4, der sich stromaufwärts der Turbine 15 befindet, ist eine Abgasrückführungsleitung 9 vorgesehen, in der ein Abgasrückführungsventil 23 vorgesehen ist, um dem Saugrohrabschnitt 12 Verbrennungsabgas als Inertgas zuzuführen. Dadurch können erweiterte Betriebsbedingungen des Verbrennungsmotors erreicht werden, die der Optimierung von Verbrennungsvorgängen und der Reduzierung von Emissionen dienen. Between the suction pipe section 12 and the part of the exhaust discharge section 4 located upstream of the turbine 15, there is provided an exhaust gas recirculation line 9 in which an exhaust gas recirculation valve 23 is provided to supply combustion exhaust gas as an inert gas to the suction pipe section 12. As a result, extended operating conditions of the internal combustion engine can be achieved, which serve the optimization of combustion processes and the reduction of emissions.
Weiterhin ist im Abgasabführungsabschnitt 4 stromabwärts der Turbine 15 eine Lambdasonde 16 angeordnet, mit der der Sauerstoffgehalt des Verbrennungsabgases ermittelt werden kann. Weiterhin können stromabwärts der Lambdason- de 16 ein Partikelfilter 17 sowie ein Katalysator 18 angeordnet sein. Furthermore, downstream of the turbine 15, a lambda probe 16 is arranged in the exhaust gas removal section 4, with which the oxygen content of the combustion exhaust gas can be determined. Furthermore, a particulate filter 17 and a catalytic converter 18 can be arranged downstream of the lambda probe 16.
Der Betrieb des Verbrennungsmotors 2 wird durch eine Steuereinheit 20 gesteuert. Basierend auf Zustandsgrößen des Motorsystems 1 , die durch geeignete Sensoren, wie z. B. einen Luftmassensensor zum Erfassen eines Luftmassen- Stroms, einen Ladedrucksensor zum Erfassen eines Ladedrucks, eine Lambdasonde zum Erfassen eines Lambdawerts und dergleichen, ermittelt und/oder durch Systemmodelle modelliert werden, werden Aktuatoren, wie z. B. ein Drosselklappensteller zum Stellen der Drosselklappe, Zündzeitpunkte von Zündeinrichtungen in den Zylindern des Verbrennungsmotors 2, der Wrkungsgrad des Turboladers 8 und dergleichen, gesteuert, um den Verbrennungsmotor in der gewünschten Weise, d. h. zum Bereitstellen eines gewünschten Antriebsmoments, anzusteuern. The operation of the internal combustion engine 2 is controlled by a control unit 20. Based on state variables of the engine system 1, which by suitable sensors, such. As an air mass sensor for detecting an air mass flow, a boost pressure sensor for detecting a boost pressure, a lambda probe for detecting a lambda value and the like, determined and / or modeled by system models, actuators, such. Example, a throttle valve actuator for setting the throttle, ignition timing of ignition devices in the cylinders of the internal combustion engine 2, the degree of rotation of the turbocharger 8 and the like, controlled to the internal combustion engine in the desired manner, d. H. to provide a desired drive torque to drive.
Die Lambdasonde 16 unterliegt aufgrund von Alterung und Temperatureinflüssen einer erheblichen Drift, so dass regelmäßig eine Nullpunktadaption der Lambdasonde 16 vorgenommen werden muss. Bei der Nullpunktadaption wird die Zu- Ordnung der von der Lambdasonde 16 bereitgestellten elektrischen Größe zu der Sauerstoffkonzentration durch einen Korrekturfaktor korrigiert. In der Regel ermittelt sich dieser Korrekturfaktor durch Bestimmen der von der Lambdasonde 16 bereitgestellten elektrischen Größe bei einer von Frischluft umspülten Lambdasonde 16. The lambda probe 16 is subject to considerable drift due to aging and temperature influences, so that a zero point adaptation of the lambda probe 16 must be made regularly. At zero point adaptation, the supply Order of the provided by the lambda probe 16 electrical quantity to the oxygen concentration corrected by a correction factor. As a rule, this correction factor is determined by determining the electrical variable provided by the lambda probe 16 in the case of a lambda probe 16 surrounded by fresh air.
Der Betrieb des Verbrennungsmotors 2 sowie die Nullpunktadaption der Lambdasonde 16 werden in einer Steuereinheit 20 durchgeführt. The operation of the internal combustion engine 2 and the zero point adaptation of the lambda probe 16 are performed in a control unit 20.
Bei Motorsystemen, die nicht in Fahrzeugen, sondern in Generatoren, Landmaschinen, Werkzeugmaschinen und dergleichen eingesetzt werden, ist es in der Regel schwierig, in dem Abgasabführungsabschnitt 4 Frischluft ohne Abgas zu erhalten. Während dies bei in Fahrzeugen eingesetzten Motorsystemen durch einen Schubbetrieb möglich ist, bei dem der Motor ohne Kraftstoffeinspritzung durch die Bewegung des Fahrzeugs mitgeschleppt wird, ist ein solcher Betriebszustand bei dem Off-Highway-Einsatz des Motorsystems nicht vorgesehen. In engine systems which are used not in vehicles but in generators, agricultural machines, machine tools and the like, it is usually difficult to obtain fresh air without exhaust gas in the exhaust gas discharge section 4. While this is possible in engine systems used in vehicles by a coasting operation, in which the engine is entrained without fuel injection by the movement of the vehicle, such an operating state in the off-highway use of the engine system is not provided.
Um der Lambdasonde für die Nullpunktadaption ein Gas mit vorbekannter Sauerstoffkonzentration zuzuführen, ist es bisher vorgesehen, einen Zustand herzustellen, in dem die Lambdasonde mit Frischluft umspült wird. Da ein Schubbetrieb bei Motoren im Off-Highway-Betrieb nicht vorgesehen ist, wird der Lambdasonde 16 daher in anderer Weise Frischluft zugeführt, um die Nullpunktadaption durchführen zu können. In order to supply the lambda probe for the zero point adaptation with a gas with a previously known oxygen concentration, it has hitherto been provided to produce a state in which the lambda probe is flushed with fresh air. Since a coasting operation is not provided for engines in off-highway operation, the lambda probe 16 is therefore supplied fresh air in another way to perform the zero point adaptation can.
In dem Ausführungsbeispiel der Figur 1 ist in dem Bereich des Luftzuführungssystems 3, stromabwärts des Luftfilters 6, eine Abzweigung vorgesehen, durch die Frischluft direkt in den Bereich des Abgasabführungsabschnitts 4 an oder unmittelbar stromaufwärts der Lambdasonde 16 geleitet wird. Die dafür vorgesehene Frischluftleitung 18 ist mit einer Luftpumpe 19 versehen, die aktiviert wird, um Frischluft in den Abgasabführungsabschnitt 4 zu pumpen, so dass die Lambdasonde 16 mit Frischluft umspült wird. In the exemplary embodiment of FIG. 1, a branch is provided in the region of the air supply system 3, downstream of the air filter 6, through which fresh air is conducted directly into the region of the exhaust gas removal section 4 at or immediately upstream of the lambda probe 16. The designated fresh air line 18 is provided with an air pump 19 which is activated to pump fresh air into the Abgasabführungsabschnitt 4, so that the lambda probe 16 is flushed with fresh air.
In Figur 2 ist ein Flussdiagramm zur Veranschaulichung des dafür durchgeführten Verfahrens dargestellt. Zunächst wird in Schritt S1 festgestellt, ob das Motorsystem 1 abgeschaltet wird. Ist dies der Fall (Alternative: Ja), so wird in Schritt S2 festgestellt, ob der Verbrennungsmotor zum Stillstand gekommen ist, ansonsten (Alternative: Nein) wird die Abfrage des Schritts S1 wiederholt. FIG. 2 shows a flowchart for illustrating the method carried out for this purpose. First, it is determined in step S1 whether the engine system 1 is turned off. If this is the case (alternative: yes), then in Step S2 determines whether the internal combustion engine has come to a standstill, otherwise (alternative: No) the query of step S1 is repeated.
Beim Abschalten des Motorsystems 1 wird zunächst die Kraftstoffzufuhr für den Verbrennungsmotor 2 unterbrochen, so dass der Verbrennungsmotor 2 ausläuft.When switching off the engine system 1, the fuel supply for the internal combustion engine 2 is first interrupted, so that the internal combustion engine 2 expires.
Wird in Schritt S2 festgestellt, dass der Verbrennungsmotor 2 zum Stillstand gekommen ist und sich nicht mehr bewegt (Alternative: Ja), so wird mit Schritt S3 fortgefahren, ansonsten wird in Schritt S2 gewartet, bis der Stillstand des Verbrennungsmotors 2 erreicht ist. If it is determined in step S2 that the internal combustion engine 2 has come to a standstill and is no longer moving (alternative: yes), then step S3 is continued, otherwise, in step S2, the system waits until the stationary state of the internal combustion engine 2 has been reached.
Die Steuereinheit 20 bleibt auch nach dem Abschalten des Verbrennungsmotors 2 weiterhin in Betrieb und steuert in einer Nachlaufphase, die mit dem Stillstand des Verbrennungsmotors 2 beginnt, die Luftpumpe 19 an (Schritt S3), um Frischluft in den Abgasabführungsabschnitt 4 einzuleiten, so dass die Lambda- sonde 16 von Frischluft umspült wird. Die Dauer der Nachlaufphase ist so festgelegt, dass sichergestellt ist, dass die Lambdasonde ausreichend von Frischluft umspült wird, um die Nullpunktadaption durchführen zu können. The control unit 20 continues to operate even after the engine 2 is turned off, and controls the air pump 19 in a follow-up phase beginning with the stop of the engine 2 (step S3) to introduce fresh air into the exhaust discharge portion 4 so that the lambda - Probe 16 is lapped by fresh air. The duration of the follow-up phase is determined in such a way that it is ensured that the lambda probe is sufficiently bathed in fresh air in order to be able to carry out the zero-point adaptation.
Anschließend kann in Schritt S4 die Nullpunktadaption der Lambdasonde 16 ba- sierend auf dem Sauerstoffgehalt von Frischluft durchgeführt werden, wie dies aus dem Stand der Technik bekannt ist. Bei der Nullpunktadaption wird ein Lambdawert (Spannung an der Lambdasonde) für eine Sauerstoffkonzentration von 21 Vol.-% der Frischluft gemessen und daraus ein Korrekturfaktor und ggf. ein Korrekturoffset für die Zuordnungsfunktion (in der Regel näherungsweise li- near) des Lambdawertes zur tatsächlichen Sauerstoffkonzentration bestimmt. Subsequently, in step S4, the zero point adaptation of the lambda probe 16 can be carried out based on the oxygen content of fresh air, as is known from the prior art. At zero point adaptation, a lambda value (voltage at the lambda probe) is measured for an oxygen concentration of 21% by volume of the fresh air and from this a correction factor and, if necessary, a correction offset for the assignment function (usually approximately linear) of the lambda value to the actual oxygen concentration certainly.
In Figur 3 ist eine weitere Ausführungsform eines Motorsystems 30 dargestellt. Das Motorsystem 30 der Figur 3 entspricht in weiten Teilen dem Motorsystem der Figur 1. Anstelle der Frischluftleitung 18, der Luftpumpe 19 und des Abgas- turboladers 8 ist ein elektrisch betriebener Turbolader mit einem Turboladerantrieb 21 vorgesehen, der den Kompressor 7 antreibt. Dadurch kann auch nach dem Stillstand des Verbrennungsmotors 2, wenn keine Abgasenthalpie mehr vorhanden ist, Frischluft durch das Luftzuführungssystem 3 gepumpt werden. Die Frischluft kann durch die Rückführungsleitung 9 und ein geöffnetes Abgasrückführungsventil 23 in den Abgasabführungsabschnitt 4 geleitet werden. Da- durch kann die Lambdasonde 16 ebenfalls mit Frischluft umspült werden. Der Turboladerantrieb 21 wird, wie zuvor beschrieben, in der Nachlaufphase des Motorsystems 1 in Betrieb genommen bzw. in Betrieb gehalten, so dass dieser Frischluft komprimiert und diese stromaufwärts des Kompressors 7 bereitstellt. Der Betrieb des Turboladerantriebs 21 wird möglichst so lange aufrecht erhalten, bis die Lambdasonde 16 nun zuverlässig mit Frischluft umspült ist. FIG. 3 shows a further embodiment of an engine system 30. The engine system 30 of FIG. 3 largely corresponds to the engine system of FIG. 1. Instead of the fresh air line 18, the air pump 19 and the exhaust turbocharger 8, an electrically operated turbocharger with a turbocharger drive 21 is provided which drives the compressor 7. As a result, fresh air can be pumped through the air supply system 3 even after the stoppage of the internal combustion engine 2, if no exhaust enthalpy is present. The fresh air can be passed through the return line 9 and an open exhaust gas recirculation valve 23 into the Abgasabführungsabschnitt 4. There- by the lambda probe 16 can also be lapped with fresh air. The turbocharger drive 21 is, as described above, put into operation in the follow-up phase of the engine system 1 or in operation, so that this fresh air is compressed and this provides upstream of the compressor 7. The operation of the turbocharger drive 21 is maintained as long as possible until the lambda probe 16 is now reliably flushed with fresh air.
Basierend auf der Ausführungsform der Figur 1 zeigt die Ausführungsform der Figur 4 eine weitere Variante eines Motorsystems 40, bei dem ebenfalls auf die Frischluftleitung 18 und die Luftpumpe 19 verzichtet werden kann. Die Ausführungsform der Figur 4 betrifft Motorsysteme, bei denen anstelle eines Abgasrückführungsventils oder zusätzlich zu dem Abgasrückführungsventil eine Abgasrückführungspumpe 25 in der Abgasrückführungsleitung 9 vorgesehen ist. Die Abgasrückführungspumpe 25 dient dazu, im Normalbetrieb des Verbrennungsmotors 2 aktiv Abgas in das Luftzuführungssystem 3 zu pumpen. Based on the embodiment of Figure 1, the embodiment of Figure 4 shows a further variant of an engine system 40, in which also the fresh air line 18 and the air pump 19 can be dispensed with. The embodiment of Figure 4 relates to engine systems in which instead of an exhaust gas recirculation valve or in addition to the exhaust gas recirculation valve, an exhaust gas recirculation pump 25 is provided in the exhaust gas recirculation line 9. The exhaust gas recirculation pump 25 serves to actively pump exhaust gas into the air supply system 3 during normal operation of the internal combustion engine 2.
Um der Lambdasonde 16 während der Nachlaufphase Frischluft zuzuführen, kann nun vorgesehen sein, dass die Abgasrückführungspumpe 25 im Umkehrbetrieb betrieben werden kann, so dass Frischluft aus dem Luftzuführungssystem 3 in den Abgasabführungsabschnitt 4 gepumpt werden kann. Auf diese Weise ist es möglich, auf die Luftpumpe 19 und die Frischluftleitung 18 zu verzichten und die bereits bestehende Abgasrückführungspumpe 25 zusätzlich für die Nullpunktadaption der Lambdasonde 16 zu verwenden. In order to supply fresh air to the lambda probe 16 during the follow-up phase, it can now be provided that the exhaust gas recirculation pump 25 can be operated in reverse operation, so that fresh air can be pumped from the air supply system 3 into the exhaust gas removal section 4. In this way it is possible to dispense with the air pump 19 and the fresh air line 18 and to use the existing exhaust gas recirculation pump 25 additionally for the zero point adaptation of the lambda probe 16.

Claims

Ansprüche claims
1. Verfahren zum Durchführen einer Nullpunktadaption einer Lambdasonde (16) in einem Abgasabführungsabschnitt (4) eines Verbrennungsmotors (2), wobei Frischluft während einer Nachlaufphase nach einem Abschalten des Verbrennungsmotors (2) von einem Luftzuführungssystem (3) in den Abgasabführungsabschnitt (4) gepumpt wird, so dass die Lambdasonde (16) von Frischluft umspült wird. 1. A method for performing a zero point adaptation of a lambda probe (16) in an Abgasabführungsabschnitt (4) of an internal combustion engine (2), wherein fresh air during a follow-up phase after a shutdown of the internal combustion engine (2) by an air supply system (3) pumped into the Abgasabführungsabschnitt (4) is, so that the lambda probe (16) is surrounded by fresh air.
2. Verfahren nach Anspruch 1 , wobei sich die Nachlaufphase an einen Zeit- punkt des vollständigen Stillstands des Verbrennungsmotors (2) anschließt. 2. The method of claim 1, wherein the follow-up phase is followed by a time point of complete standstill of the internal combustion engine (2).
3. Verfahren nach Anspruch 1 oder 2, wobei die Dauer der Nachlaufphase zeitlich begrenzt ist und mindestens so lange dauert, bis die Lambdasonde (16) von Frischluft umspült ist. 3. The method of claim 1 or 2, wherein the duration of the trailing phase is limited in time and takes at least as long until the lambda probe (16) is surrounded by fresh air.
4. Verfahren nach einem der Ansprüche 1 bis 3, wobei eine Nullpunktadaption der Lambdasonde (16) durchgeführt wird, wenn die Lambdasonde (16) von Frischluft umspült ist. 4. The method according to any one of claims 1 to 3, wherein a zero point adaptation of the lambda probe (16) is performed when the lambda probe (16) is surrounded by fresh air.
5. Motorsystem (1 , 30, 40) umfassend: 5. motor system (1, 30, 40) comprising:
- einen Verbrennungsmotor (2), dem Frischluft über ein Luftzuführungssystem (3) zuführbar und von dem Verbrennungsabgas über einen Abgasabführungsabschnitt (4) abführbar ist;  - an internal combustion engine (2), the fresh air via an air supply system (3) can be fed and discharged from the combustion exhaust gas via an exhaust gas discharge section (4);
- eine Lambdasonde (16), die in dem Abgasabführungsabschnitt (4) ange- ordnet ist;  - A lambda probe (16) disposed in the Abgasabführungsabschnitt (4) is arranged;
- eine Pumpe (7, 19, 25) , um Frischluft von dem Luftzuführungssystem (3) zu dem Abgasabführungsabschnitt (4) zu pumpen;  a pump (7, 19, 25) for pumping fresh air from the air supply system (3) to the exhaust discharge section (4);
- eine Steuereinheit (20), um während einer Nachlaufphase nach einem Abschalten des Verbrennungsmotors (2) die Pumpe (7, 19, 25) anzusteu- ern, um Frischluft in den Abgasabführungsabschnitt (4) zu pumpen, so dass die Lambdasonde (16) von Frischluft umspült wird. Motorsystem (1 , 40) nach Anspruch 5, wobei die Pumpe (19, 25) in einer Leitung (9, 18) angeordnet ist, die das Luftzuführungssystem (3) mit dem Abgasabführungsabschnitt verbindet. a control unit (20) in order to control the pump (7, 19, 25) during a follow-up phase after a shutdown of the internal combustion engine (2) in order to pump fresh air into the exhaust gas removal section (4) so that the lambda probe (16) is lapped by fresh air. An engine system (1, 40) according to claim 5, wherein the pump (19, 25) is disposed in a duct (9, 18) connecting the air supply system (3) to the exhaust discharge section.
Motorsystem (1 , 40) nach Anspruch 6, wobei die Pumpe einer Abgasrückführungspumpe (25) in einer Abgasrückführungsleitung (9) entspricht, wobei die Abgasrückführungspumpe (25) ansteuerbar ist, um im Normalbetrieb Verbrennungsabgas in das Luftzuführungssystem (3), insbesondere in einen Saugrohrabschnitt, zu pumpen, und um in der Nachlaufphase in einem Umkehrbetrieb betrieben zu werden, bei dem Frischluft in den Abgasabführungsabschnitt (4) geleitet wird. Engine system (1, 40) according to claim 6, wherein the pump corresponds to an exhaust gas recirculation pump (25) in an exhaust gas recirculation line (9), wherein the exhaust gas recirculation pump (25) is controllable, in normal operation, combustion exhaust gas in the air supply system (3), in particular in a Saugrohrabschnitt to pump, and to be operated in the follow-up phase in a reverse operation in which fresh air is fed into the Abgasabführungsabschnitt (4).
Motorsystem (30) nach Anspruch 6, wobei die Pumpe (19) in einer Frischluftleitung (18) angeordnet ist, die in einem Bereich vor einem Kompressor (7) eines Turboladers von dem Luftzuführungssystem (3) abführt und im Bereich der Lambdasonde (16) oder stromaufwärts davon in den Abgasabführungsabschnitt (4) mündet. Motor system (30) according to claim 6, wherein the pump (19) is arranged in a fresh air line (18) which discharges in a region upstream of a compressor (7) of a turbocharger from the air supply system (3) and in the region of the lambda probe (16). or upstream of it into the Abgasabführungsabschnitt (4) opens.
Motorsystem (1) nach Anspruch 5, wobei die Pumpe einem von dem Verbrennungsmotor unabhängig betreibbaren Kompressor (7) eines Turboladers in dem Luftzuführungssystem (3) entspricht. An engine system (1) according to claim 5, wherein the pump corresponds to a compressor (7) of a turbocharger independently operable by the internal combustion engine in the air supply system (3).
0. Motorsystem (1 , 30, 40) nach einem der Ansprüche 5 bis 9, wobei die Steuereinheit (20) ausgebildet ist, um eine Nullpunktadaption der Lambdasonde (16) durchzuführen, wenn die Lambdasonde (16) von Frischluft umspült ist. 0. Motor system (1, 30, 40) according to one of claims 5 to 9, wherein the control unit (20) is designed to perform a zero point adaptation of the lambda probe (16) when the lambda probe (16) is surrounded by fresh air.
EP11790628.9A 2010-12-15 2011-12-02 Method and device for carrying out a zero point adaptation of a lambda probe of an internal combustion engine Withdrawn EP2652281A1 (en)

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DE102010063095A DE102010063095A1 (en) 2010-12-15 2010-12-15 Method and apparatus for performing a zero point adaptation of a lambda probe of an internal combustion engine
PCT/EP2011/071591 WO2012080000A1 (en) 2010-12-15 2011-12-02 Method and device for carrying out a zero point adaptation of a lambda probe of an internal combustion engine

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE537121C2 (en) * 2013-05-22 2015-01-27 Scania Cv Ab Device and method for determining the function of a sensor for determining the content of a component of exhaust gases from an engine
DE102014104543B4 (en) 2014-03-31 2021-03-25 Denso Corporation Procedure for calibrating a lambda probe
DE102014210442A1 (en) * 2014-06-03 2015-12-17 Robert Bosch Gmbh Method for correcting a voltage-lambda characteristic
DE102014211804B4 (en) * 2014-06-19 2023-06-29 Volkswagen Aktiengesellschaft Method for cooling at least one component of an internal combustion engine
FR3053729B1 (en) * 2016-07-05 2018-08-03 Peugeot Citroen Automobiles Sa METHOD FOR DETECTING THE PRESENCE OF A PARTICLE FILTER OF AN INTERNAL COMBUSTION ENGINE
FR3062167B1 (en) * 2017-01-26 2020-06-12 Renault S.A.S METHOD AND DEVICE FOR CALIBRATING AN OXYGEN SENSOR.
NL2023547B1 (en) * 2019-07-22 2021-02-10 Daf Trucks Nv Air Flow Heater Assist by E-Turbo

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0643981B2 (en) * 1985-10-02 1994-06-08 株式会社日立製作所 Air-fuel ratio controller
DE69825813T2 (en) * 1997-03-21 2005-02-03 NGK Spark Plug Co., Ltd., Nagoya Method and apparatus for measuring a NOx gas concentration
DE19810973A1 (en) * 1998-03-13 1999-09-30 Fev Motorentech Gmbh Method for stabilizing the zero point of an exhaust gas sensor and arrangement for carrying out the method
DE102006058880A1 (en) 2006-12-13 2008-07-03 Siemens Ag Method for correcting an output signal of a lambda sensor and internal combustion engine
US8235150B2 (en) * 2008-06-24 2012-08-07 Rez Mustafa Pneumatic hybrid turbo transmission
US8181452B2 (en) * 2009-09-29 2012-05-22 Ford Global Technologies, Llc Particulate filter regeneration during engine shutdown

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
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