DE102012221549A1 - Method for determining gaseous mixture composition in exhaust gas passage of internal combustion engine i.e. Otto engine, involves correcting output signal of exhaust-gas sensor with quantity dependant on composition of gaseous mixture - Google Patents
Method for determining gaseous mixture composition in exhaust gas passage of internal combustion engine i.e. Otto engine, involves correcting output signal of exhaust-gas sensor with quantity dependant on composition of gaseous mixture Download PDFInfo
- Publication number
- DE102012221549A1 DE102012221549A1 DE201210221549 DE102012221549A DE102012221549A1 DE 102012221549 A1 DE102012221549 A1 DE 102012221549A1 DE 201210221549 DE201210221549 DE 201210221549 DE 102012221549 A DE102012221549 A DE 102012221549A DE 102012221549 A1 DE102012221549 A1 DE 102012221549A1
- Authority
- DE
- Germany
- Prior art keywords
- exhaust gas
- lambda
- gas sensor
- composition
- exhaust
- 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.)
- Ceased
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 38
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000008246 gaseous mixture Substances 0.000 title abstract 5
- 239000000523 sample Substances 0.000 claims abstract description 39
- 239000007789 gas Substances 0.000 claims description 67
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 230000035945 sensitivity Effects 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- BUHVIAUBTBOHAG-FOYDDCNASA-N (2r,3r,4s,5r)-2-[6-[[2-(3,5-dimethoxyphenyl)-2-(2-methylphenyl)ethyl]amino]purin-9-yl]-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound COC1=CC(OC)=CC(C(CNC=2C=3N=CN(C=3N=CN=2)[C@H]2[C@@H]([C@H](O)[C@@H](CO)O2)O)C=2C(=CC=CC=2)C)=C1 BUHVIAUBTBOHAG-FOYDDCNASA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
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
- 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
- F02D41/14—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
- F02D41/02—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
- F02D41/1458—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 with determination means using an estimation
-
- 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
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
-
- 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
- F02D2041/147—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 a hydrogen content or concentration of the exhaust gases
-
- 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
- F02D2041/1472—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 a humidity or water content of the exhaust gases
-
- 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
- F02D41/1452—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 a COx content or concentration
-
- 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
- F02D41/1452—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 a COx content or concentration
- F02D41/1453—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 a COx content or concentration the characteristics being a CO content or concentration
-
- 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
- F02D41/1459—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 a hydrocarbon content or concentration
-
- 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
- F02D41/146—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 NOx content or concentration
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Stand der TechnikState of the art
Die Erfindung betrifft ein Verfahren zur Bestimmung einer Zusammensetzung eines Gasgemischs im Abgaskanal einer Brennkraftmaschine, wobei die Zusammensetzung mittels eines Abgassensors bestimmt wird.The invention relates to a method for determining a composition of a gas mixture in the exhaust passage of an internal combustion engine, wherein the composition is determined by means of an exhaust gas sensor.
Die Erfindung betrifft weiterhin eine Vorrichtung zur Bestimmung einer Zusammensetzung eines Gasgemischs im Abgaskanal einer Brennkraftmaschine, wobei im Abgaskanal zumindest ein Abgassensor angeordnet ist und wobei der Brennkraftmaschine ein Steuergerät zur Auswertung eines Ausgangssignals des Abgassensors zugeordnet ist.The invention further relates to a device for determining a composition of a gas mixture in the exhaust passage of an internal combustion engine, wherein in the exhaust passage at least one exhaust gas sensor is arranged and wherein the internal combustion engine is assigned a control device for evaluating an output signal of the exhaust gas sensor.
Zur Optimierung des Schadstoffausstoßes und der Abgasnachbehandlung werden bei modernen Brennkraftmaschinen Lambdasonden zur Bestimmung der Zusammensetzung des Abgases und zur Steuerung der Brennkraftmaschine eingesetzt. Lambdasonden bestimmen den Sauerstoffgehalt des Abgases, was zur Regelung des der Brennkraftmaschine zugeführten Luft-Kraftstoff-Gemischs und somit des Abgaslambdas vor einem Katalysator verwendet wird. Dabei wird über einen Lambda-Regelkreis die Luft- und Kraftstoffzuführung der Brennkraftmaschine derart geregelt, dass eine für die Abgasnachbehandlung durch in dem Abgaskanal der Brennkraftmaschine vorgesehene Katalysatoren optimale Zusammensetzung des Abgases erreicht wird. Bei Ottomotoren wird in der Regel auf ein Lambda von 1, also ein stöchiometrisches Verhältnis von Luft zu Kraftstoff, geregelt. Die Schadstoffemission der Brennkraftmaschine kann so minimiert werden.In order to optimize pollutant emissions and exhaust aftertreatment lambda probes are used in modern internal combustion engines for determining the composition of the exhaust gas and for controlling the internal combustion engine. Lambda sensors determine the oxygen content of the exhaust gas, which is used to control the internal combustion engine supplied air-fuel mixture and thus the Abgaslambda before a catalyst. In this case, the air and fuel supply of the internal combustion engine is controlled via a lambda control loop such that an exhaust gas aftertreatment by provided in the exhaust passage of the internal combustion engine catalysts optimal composition of the exhaust gas is achieved. In gasoline engines is usually on a lambda of 1, ie a stoichiometric ratio of air to fuel regulated. The pollutant emission of the internal combustion engine can be minimized.
Es sind verschiedene Formen von Lambdasonden im Einsatz. Bei einer Zweipunkt-Lambdasonde, auch als Sprungsonde oder Nernst-Sonde bezeichnet, weist die Spannungs-Lambda-Kennlinie bei Lambda = 1 einen sprungartigen Abfall auf. Sie erlaubt daher im Wesentlichen die Unterscheidung zwischen fettem Abgas (λ < 1) bei Betrieb der Brennkraftmaschine mit Kraftstoffüberschuss und magerem Abgas (λ > 1) bei Betrieb mit Luftüberschuss und ermöglicht eine Regelung des Abgases auf ein Lambda von 1. There are various forms of lambda probes in use. In a two-point lambda probe, also referred to as a jump probe or Nernst probe, the voltage lambda curve at lambda = 1 has a sudden drop. It therefore essentially allows the distinction between rich exhaust gas (λ <1) when operating the internal combustion engine with excess fuel and lean exhaust gas (λ> 1) when operating with excess air and allows control of the exhaust gas to a lambda of 1.
Eine Breitband-Lambdasonde, auch als stetige oder lineare Lambdasonde bezeichnet, ermöglicht die Bestimmung des Lambdawertes in dem Abgas in einem weiten Bereich um Lambda = 1 herum. Damit kann beispielhaft eine Brennkraftmaschine auch auf einen mageren Betrieb mit Luftüberschuss geregelt werden. A broadband lambda probe, also referred to as a steady or linear lambda probe, makes it possible to determine the lambda value in the exhaust gas in a wide range around lambda = 1. Thus, by way of example, an internal combustion engine can also be regulated to a lean operation with excess air.
Eine Linearisierung der Sondenkennlinie einer Zweipunkt-Lambdasonde erlaubt es, auch mit einer solchen kostengünstigeren Sonde in einem eingeschränkten Lambdabereich eine stetige Lambdaregelung vor Katalysator zu verwirklichen. Voraussetzung hierfür ist, dass zwischen der Sondenspannung der Zweipunkt-Lambdasonde und dem Lambdawert ein eindeutiger Zusammenhang besteht. Dieser Zusammenhang muss über die gesamte Lebensdauer der Zweipunkt-Lambdasonde vorliegen, da andernfalls die Genauigkeit der Regelung nicht ausreichend ist und unzulässig hohe Emissionen auftreten können. Auf Grund von Fertigungstoleranzen und von Alterungseffekten der Zweipunkt-Lambdasonde ist diese Voraussetzung nicht erfüllt. Daher werden Zweipunkt-Lambdasonden vor Katalysator zumeist mit einer Zweipunkt-Regelung verwendet. Diese hat den Nachteil, dass in Betriebsmodi, für die ein mageres oder fettes Luft-Kraftstoff-Gemisch notwendig ist, beispielsweise zur Katalysatordiagnose oder zum Bauteileschutz, das Ziel-Lambda nur vorgesteuert eingestellt, aber nicht geregelt werden kann. In den Schriften mit den internen Bezeichnungen R.343360 und R.343914 der Anmelderin werden Lösungen für diese Problematiken angegeben. A linearization of the probe characteristic of a two-point lambda probe makes it possible to realize a steady lambda control in front of the catalytic converter even with such a less expensive probe in a restricted lambda range. The prerequisite for this is that there is a clear relationship between the probe voltage of the two-point lambda probe and the lambda value. This relationship must be present over the entire service life of the two-point lambda probe, since otherwise the accuracy of the control is insufficient and unacceptably high emissions may occur. Due to manufacturing tolerances and aging effects of the two-point lambda probe this condition is not met. Therefore, two-point lambda probes before catalyst are usually used with a two-point control. This has the disadvantage that in operating modes for which a lean or rich air-fuel mixture is necessary, for example, for catalyst diagnosis or component protection, the target lambda set only pilot-operated, but can not be controlled. Applicants' own references R.343360 and R.343914 provide solutions to these problems.
Darüber hinaus wird die Sondenspannung einer Abgassonde (nicht nur einer Zweipunkt-Lambdasonde) in der Regel auch durch Querempfindlichkeiten der Sonde gegenüber Abgaskomponenten wie Kohlenmonoxid, Kohlendioxid, Wasserstoff, Wasserdampf, Kohlenwasserstoffen, Stickoxiden und, bei anderen als Lambdasonden, auch Sauerstoff bestimmt. Das führt dazu, dass bei unterschiedlichen Abgaszusammensetzungen trotz gleichen Abgaslambdas unterschiedliche Ausgangsspannungen der Abgassonde gemessen werden. Insbesondere können sich im Fahrbetrieb bei unterschiedlichen Betriebspunkten der Brennkraftmaschine trotz gleichen Abgaslambdas unterschiedliche Ausgangsspannungen der Abgassonde einstellen. Wird dies nicht berücksichtigt, wird ein verfälschter Lambdawert bestimmt, was sich nachteilig auf die Genauigkeit der Lambdaregelung auswirkt.In addition, the probe voltage of an exhaust gas probe (not just a two-point lambda probe) is usually also determined by cross-sensitivities of the probe to exhaust gas components such as carbon monoxide, carbon dioxide, hydrogen, water vapor, hydrocarbons, nitrogen oxides and oxygen other than lambda probes. This leads to different output voltages of the exhaust gas probe being measured at different exhaust gas compositions despite the same exhaust gas lambda. In particular, different output voltages of the exhaust gas probe can be set during driving at different operating points of the internal combustion engine despite the same exhaust gas lambda. If this is not taken into account, a falsified lambda value is determined, which adversely affects the accuracy of the lambda control.
Die
Es ist Aufgabe der Erfindung, ein Verfahren bereitzustellen, mit dem ein Ausgangssignal einer Abgassonde bereitgestellt werden kann, das eine verminderte Abhängigkeit von Querempfindlichkeiten aufgrund der Abgaszusammensetzung aufweist. It is an object of the invention to provide a method by which an output signal of an exhaust gas probe can be provided which has a has reduced dependence on cross sensitivities due to the exhaust gas composition.
Es ist weiterhin Aufgabe der Erfindung, eine entsprechende Steuereinheit zur Durchführung des Verfahrens bereitzustellen.It is a further object of the invention to provide a corresponding control unit for carrying out the method.
Offenbarung der ErfindungDisclosure of the invention
Die das Verfahren betreffende Aufgabe der Erfindung wird dadurch gelöst, dass ein Ausgangssignal des Abgassensors mit einer von der Zusammensetzung des Gasgemischs abhängigen Korrektur korrigiert wird. Querempfindlichkeiten von Abgassensoren führen dazu, dass das Ausgangssignal nicht nur von der Konzentration der zu bestimmenden Gaskomponente abhängt, sondern die Konzentration von Beimengungen ebenfalls das Ausgangssignal beeinflussen. Erfindungsgemäß wird daher die Art und Menge oder Konzentration von Beimengungen im Gasgemisch bestimmt und das Ausgangssignal des Abgassensors oder die Umrechnung von Ausgangssignal zum Zielwert, beispielhaft einem Lambdawert, entsprechend korrigiert. Durch die Korrektur wird erreicht, dass sich unabhängig von der aktuellen Abgaszusammensetzung ein eindeutiger Zusammenhang zwischen dem Ausgangssignal des Abgassensors und dem Zielwert ergibt. The object of the invention relating to the method is achieved by correcting an output signal of the exhaust gas sensor with a correction dependent on the composition of the gas mixture. Cross sensitivities of exhaust gas sensors lead to the fact that the output signal not only depends on the concentration of the gas component to be determined, but the concentration of admixtures also influence the output signal. According to the invention, therefore, the type and amount or concentration of admixtures in the gas mixture is determined and the output signal of the exhaust gas sensor or the conversion of output signal to the target value, for example, a lambda value, corrected accordingly. The correction ensures that a clear relationship between the output signal of the exhaust gas sensor and the target value results irrespective of the current exhaust gas composition.
Entsprechend einer besonders bevorzugten Ausgestaltungsvariante der Erfindung ist es vorgesehen, dass zur Bestimmung der Korrektur eine Konzentration oder ein Mengenanteil einer oder mehrerer Komponenten des Gasgemischs aus einem Modell oder auf Basis von in einer Steuerung der Brennkraftmaschine verfügbaren Messgrößen bestimmt werden. According to a particularly preferred embodiment variant of the invention, it is provided that for determining the correction, a concentration or a proportion of one or more components of the gas mixture from a model or on the basis of available in a control of the internal combustion engine parameters are determined.
Werden Querempfindlichkeiten für Abgaskomponenten wie Kohlenmonoxid und/oder Kohlendioxid und/oder Wasserstoff und/oder Wasserdampf und/oder Kohlenwasserstoffen und/oder Stickoxiden und/oder Sauerstoff berücksichtigt, kann durch die Korrektur ein eindeutiger Zusammenhang zwischen dem Ausgangssignal des Abgassensors und dem Zielwert erreicht werden.If cross sensitivities for exhaust gas components such as carbon monoxide and / or carbon dioxide and / or hydrogen and / or water vapor and / or hydrocarbons and / or nitrogen oxides and / or oxygen are taken into account, a clear correlation between the output signal of the exhaust gas sensor and the target value can be achieved by the correction.
Das erfindungsgemäße Verfahren ist besonders geeignet, aus dem Ausgangssignal des Abgassensors einen Lambdawert des Gasgemischs zu bestimmen. Es kann insbesondere eine kostengünstige Zweipunkt-Lambdasonde mit dem Verfahren ertüchtigt werden, in einem gewissen Bereich eine stetige Lambdaregelung zu verwirklichen. Eine Lambdaregelung mit dem Abgassensor im Abgaskanal der Brennkraftmaschine wird durch die Berücksichtigung der Querempfindlichkeiten in den unterschiedlichsten Motorbetriebspunkten besonders genau und zuverlässig. Unzulässig hohe Emissionen an unerwünschten Abgaskomponenten können so vermieden werden.The method according to the invention is particularly suitable for determining a lambda value of the gas mixture from the output signal of the exhaust gas sensor. In particular, a cost-effective two-point lambda probe can be upgraded with the method of realizing a continuous lambda control in a certain range. A lambda control with the exhaust gas sensor in the exhaust passage of the internal combustion engine is particularly accurate and reliable by taking into account the cross sensitivities in the various engine operating points. Inadmissibly high emissions of unwanted exhaust gas components can thus be avoided.
Eine Variante des Verfahrens sieht vor, dass eine Umrechnung des Ausgangssignals in den Lambdawert mittels einer Referenzkennlinie des Abgassensors und einem Sensormodell erfolgt, in dem Querempfindlichkeiten des Abgassensors berücksichtigt werden.A variant of the method provides that a conversion of the output signal into the lambda value by means of a reference characteristic of the exhaust gas sensor and a sensor model is carried out in the cross sensitivities of the exhaust gas sensor are taken into account.
Die die Vorrichtung betreffende Aufgabe wird gelöst, indem in dem Steuergerät ein Programmablauf oder ein Schaltkreis vorgesehen ist, der für eine Korrektur des Ausgangssignals des Abgassensors aufgrund von zumindest einer Komponente des Gasgemischs vorgesehen ist. Die Korrektur des Ausgangsignals und die korrigierte Umrechnung in einen Zielwert, wie beispielhaft in einen Lambdawert, führt zu einer verbesserten Regelgenauigkeit der Steuerung und zu verminderten Emissionen der Brennkraftmaschine.The object concerning the device is achieved by providing in the control unit a program sequence or a circuit which is provided for a correction of the output signal of the exhaust gas sensor on the basis of at least one component of the gas mixture. The correction of the output signal and the corrected conversion into a target value, such as for example in a lambda value, leads to an improved control accuracy of the control and to reduced emissions of the internal combustion engine.
Ist der Abgassensor als Zweipunkt-Lambdasonde ausgebildet, kann kostengünstig eine präzise Lambdaregelung für die Brennkraftmaschine verwirklicht werden, wobei auch in unterschiedlichen Betriebspunkten der Brennkraftmaschine eine dauerhaft präzise Bestimmung des Lambdawerts des Abgases möglich ist.If the exhaust gas sensor is designed as a two-point lambda probe, a precise lambda control for the internal combustion engine can be realized cost-effectively, whereby a permanently precise determination of the lambda value of the exhaust gas is possible even at different operating points of the internal combustion engine.
Die Erfindung wird im Folgenden anhand eines in der Figur dargestellten Ausführungsbeispiels näher erläutert. Es zeigt:The invention will be explained in more detail below with reference to an embodiment shown in the figure. It shows:
Im praktischen Fahrbetrieb bei unterschiedlichen Motorbetriebspunkten können sich hierdurch trotz gleichem Abgaslambda unterschiedliche Ausgangssignale des Abgassensors ergeben. In einem solchen Fall ist die Genauigkeit der Lambdaregelung nicht mehr ausreichend und es können unzulässig hohe Emissionen auftreten. Ohne Querempfindlichkeiten stellt sich ein Spannungswert
Liegt eine Verschiebung der tatsächlichen Spannungs-Lambda-Kennlinie
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 10147491 [0008] DE 10147491 [0008]
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201210221549 DE102012221549A1 (en) | 2012-11-26 | 2012-11-26 | Method for determining gaseous mixture composition in exhaust gas passage of internal combustion engine i.e. Otto engine, involves correcting output signal of exhaust-gas sensor with quantity dependant on composition of gaseous mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201210221549 DE102012221549A1 (en) | 2012-11-26 | 2012-11-26 | Method for determining gaseous mixture composition in exhaust gas passage of internal combustion engine i.e. Otto engine, involves correcting output signal of exhaust-gas sensor with quantity dependant on composition of gaseous mixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE102012221549A1 true DE102012221549A1 (en) | 2014-05-28 |
Family
ID=50679013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE201210221549 Ceased DE102012221549A1 (en) | 2012-11-26 | 2012-11-26 | Method for determining gaseous mixture composition in exhaust gas passage of internal combustion engine i.e. Otto engine, involves correcting output signal of exhaust-gas sensor with quantity dependant on composition of gaseous mixture |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE102012221549A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015188984A1 (en) * | 2014-06-10 | 2015-12-17 | Robert Bosch Gmbh | Method and device for operating an exhaust gas probe |
| DE102016211506A1 (en) | 2016-06-27 | 2017-12-28 | Robert Bosch Gmbh | Method and device for monitoring the functionality of an emission control system |
| DE102016211595A1 (en) | 2016-06-28 | 2017-12-28 | Robert Bosch Gmbh | Method and device for controlling and / or monitoring the function of a secondary air supply in an emission control system |
| CN107917005A (en) * | 2016-10-11 | 2018-04-17 | 罗伯特·博世有限公司 | For adjusting method and the control device that the oxygen of ternary catalyzing unit fills |
| DE102017201742A1 (en) | 2017-02-03 | 2018-08-09 | Robert Bosch Gmbh | Method for heating and regenerating a particulate filter in the exhaust gas of a gasoline engine |
| DE102015117530B4 (en) | 2014-10-29 | 2024-02-08 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | SYSTEM FOR THE AFTERTREATMENT OF AN EXHAUST FLOW WITH A NOx SENSOR CALIBRATION |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10147491A1 (en) | 2001-09-26 | 2003-04-24 | Bosch Gmbh Robert | Air / fuel ratio control method for an internal combustion engine |
-
2012
- 2012-11-26 DE DE201210221549 patent/DE102012221549A1/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10147491A1 (en) | 2001-09-26 | 2003-04-24 | Bosch Gmbh Robert | Air / fuel ratio control method for an internal combustion engine |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015188984A1 (en) * | 2014-06-10 | 2015-12-17 | Robert Bosch Gmbh | Method and device for operating an exhaust gas probe |
| CN106460696A (en) * | 2014-06-10 | 2017-02-22 | 罗伯特·博世有限公司 | Method and device for operating an exhaust gas probe |
| DE102015117530B4 (en) | 2014-10-29 | 2024-02-08 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | SYSTEM FOR THE AFTERTREATMENT OF AN EXHAUST FLOW WITH A NOx SENSOR CALIBRATION |
| DE102016211506A1 (en) | 2016-06-27 | 2017-12-28 | Robert Bosch Gmbh | Method and device for monitoring the functionality of an emission control system |
| DE102016211595A1 (en) | 2016-06-28 | 2017-12-28 | Robert Bosch Gmbh | Method and device for controlling and / or monitoring the function of a secondary air supply in an emission control system |
| CN107917005A (en) * | 2016-10-11 | 2018-04-17 | 罗伯特·博世有限公司 | For adjusting method and the control device that the oxygen of ternary catalyzing unit fills |
| CN107917005B (en) * | 2016-10-11 | 2022-06-03 | 罗伯特·博世有限公司 | Method and control device for regulating the oxygen filling of a three-way catalytic converter |
| DE102017201742A1 (en) | 2017-02-03 | 2018-08-09 | Robert Bosch Gmbh | Method for heating and regenerating a particulate filter in the exhaust gas of a gasoline engine |
| CN108386260A (en) * | 2017-02-03 | 2018-08-10 | 罗伯特·博世有限公司 | Method for heating and regenerating the particulate filter in the exhaust gas of gasoline engine |
| KR20180090759A (en) * | 2017-02-03 | 2018-08-13 | 로베르트 보쉬 게엠베하 | Method for heating and regenerating a particulate filter in an exhaust gas of an otto engine |
| KR102422973B1 (en) * | 2017-02-03 | 2022-07-20 | 로베르트 보쉬 게엠베하 | Method for heating and regenerating a particulate filter in an exhaust gas of an otto engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE102012211687B4 (en) | Method and control unit for detecting a voltage offset of a voltage lambda characteristic curve | |
| DE102008042549B4 (en) | Method and device for diagnosing an exhaust gas probe | |
| DE102008001569B4 (en) | Method and device for adapting a dynamic model of an exhaust gas probe | |
| DE102012211683B4 (en) | Method and device for correcting a characteristic curve of a two-point lambda sensor | |
| DE102012208092B4 (en) | Method and control unit for compensating for a voltage offset of a two-point lambda probe | |
| DE3500594A1 (en) | Metering system for an internal combustion engine for influencing the operating mixture | |
| DE102012221549A1 (en) | Method for determining gaseous mixture composition in exhaust gas passage of internal combustion engine i.e. Otto engine, involves correcting output signal of exhaust-gas sensor with quantity dependant on composition of gaseous mixture | |
| DE102017100222A1 (en) | DETECTING THE BLACKING OF AN OXYGEN SENSOR ELEMENT | |
| DE102016219689A1 (en) | Method and control device for controlling an oxygen loading of a three-way catalytic converter | |
| EP1048834A2 (en) | Method for correcting the characteristic curve of a linear lambda sensor | |
| DE102009045376A1 (en) | Method and device for diagnosing the dynamics of an exhaust gas sensor | |
| DE102011087310B3 (en) | Method for operating linear lambda probe in exhaust gas duct of internal combustion engine in car, involves determining offset error of measurement signal from difference signal between pump voltage signal and Nernst voltage signal | |
| EP0530655A2 (en) | Method and apparatus for controlling an internal combustion engine and testing its catalytic converter | |
| EP1075657A1 (en) | METHOD FOR DETERMINING NO x? CONCENTRATION | |
| DE10309422A1 (en) | Calibrating nitrogen oxide sensor in engine exhaust system, shuts off engine for interval during which decay of nitrogen oxide signal is observed and evaluated | |
| DE102017205325A1 (en) | Method and control unit for operating a particulate filter | |
| DE102017201742A1 (en) | Method for heating and regenerating a particulate filter in the exhaust gas of a gasoline engine | |
| DE19819204C1 (en) | Trimming two-point exhaust gas sensor indication, to compensate behavioral shift due to aging and poisoning | |
| EP1960644A1 (en) | Method for the diagnosis of a catalytic converter which is arranged in an exhaust area of an internal combustion engine and device for carrying out said method | |
| DE102013202260A1 (en) | Method for monitoring steady lambda signal of multi-cellular exhaust-gas sensor, involves determining pump voltage and nernst voltage with respect to lambda value of exhaust gas from constant lambda signal | |
| DE10161901B4 (en) | Method and device for compensating the offset of the linear sensor characteristic of a sensor arranged in the exhaust gas of an internal combustion engine | |
| DE10014881A1 (en) | Calibration of lambda sensors in exhaust system including NOx sensor downstream of three-way catalyst, first adjusts mixture to approach predetermined NOx signal | |
| EP1079090B1 (en) | Method for calibration of a wideband lambda probe used in internal combustion engines | |
| DE102013216595A1 (en) | Method and device for correcting a characteristic curve of a lambda probe | |
| EP3224464A1 (en) | Method for detecting a voltage offset at least in a portion of a voltage lambda characteristic curve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R012 | Request for examination validly filed | ||
| R002 | Refusal decision in examination/registration proceedings | ||
| R003 | Refusal decision now final |