DE4318640A1 - Monitoring system for leakage of exhaust gas pipes at IC engines - uses at least two lambda probes arranged at distance from each other within gas exhaust section and their output signals are led to control unit. - Google Patents

Monitoring system for leakage of exhaust gas pipes at IC engines - uses at least two lambda probes arranged at distance from each other within gas exhaust section and their output signals are led to control unit.

Info

Publication number
DE4318640A1
DE4318640A1 DE4318640A DE4318640A DE4318640A1 DE 4318640 A1 DE4318640 A1 DE 4318640A1 DE 4318640 A DE4318640 A DE 4318640A DE 4318640 A DE4318640 A DE 4318640A DE 4318640 A1 DE4318640 A1 DE 4318640A1
Authority
DE
Germany
Prior art keywords
lambda
exhaust gas
exhaust
signals
engine
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Withdrawn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
DE4318640A
Other languages
German (de)
Inventor
Harald Krohm
Ludger Hoelscher
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.)
Schaeffler Engineering GmbH
Original Assignee
AFT Atlas Fahrzeugtechnik 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 AFT Atlas Fahrzeugtechnik GmbH filed Critical AFT Atlas Fahrzeugtechnik GmbH
Priority to DE4318640A priority Critical patent/DE4318640A1/en
Publication of DE4318640A1 publication Critical patent/DE4318640A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • F02B77/088—Safety, indicating, or supervising devices relating to tightness
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The system has two spaced apart lambda probes (9,10) in an exhaust section (7) of a vehicle IC engine (1). A fault signal is produced on deviation of two signals (U lambda 1, U lambda 2) from each other, occurring exclusively due to a rise of the oxygen concn.. The comparison measurement (11) of the lambda signals, results during the suction phase of the engine performance graph. A non-erasable diagnosis signal is produced as a fault signal. One of the lambda probes (9) is arranged as near as possible to the outlet valve (6) of the IC engine. The second lambda probe (10) is arranged as near as possible before a three way catalyser (8). ADVANTAGE - Detects sealing defects in exhaust gas system, for optimal combustion and cleaning of exhaust gases in 3-way catalyser.

Description

Die Erfindung betrifft eine Überwachungsvorrichtung für die Leckage von Abgasleitungen an Verbrennungsmotoren mit mindestens einer Lambdasonde in der Abgasstrecke.The invention relates to a monitoring device for the leakage of exhaust pipes on internal combustion engines at least one lambda sensor in the exhaust system.

Die Lambdasonde dient zur Messung der Sauerstoffkonzen­ tration im Abgas und damit zur Erfassung des Luft-Kraft­ stoff-Verhältnisses. Dadurch läßt sich die Gemischbildung im Sinne einer optimalen Verbrennung und Reinigung des Abgases in einem Dreiwegekatalysator regeln.The lambda probe is used to measure the oxygen concentrations tration in the exhaust gas and thus to record the air force substance ratio. This allows the mixture formation in the sense of optimal combustion and cleaning of the Control exhaust gas in a three-way catalytic converter.

Voraussetzung für die Wirksamkeit dieses Systems ist, daß die Abgasstrecke keine Undichtigkeiten oder Leckagen auf­ weist, da sonst nicht das unveränderte Abgas den Dreiwege­ katalysator erreicht. Undichtigkeiten machen sich ins­ besondere in Unterdruckphasen, die in bestimmten Betriebs­ zuständen durch die intermittierende, zu Pulsationen führende Arbeitsweise des Verbrennungsmotors bedingt sind, bemerkbar. Infolge dieser Pulsationen kann während dieser Unterdruckphasen vergleichsweise hochsauerstoffhaltige Außenluft an den Undichtigkeiten in die Abgasstrecke ein­ dringen.The prerequisite for the effectiveness of this system is that the exhaust system does not detect any leaks or leaks points, because otherwise the unchanged exhaust gas does the three-way catalyst reached. Leaks get into it particularly in negative pressure phases in certain operating states through the intermittent, to pulsations leading mode of operation of the internal combustion engine are necessary, noticeable. As a result of these pulsations can occur during this Vacuum phases comparatively high oxygen Outside air at the leaks in the exhaust system penetrate.

Aufgabe der Erfindung ist der Nachweis solcher Undichtig­ keiten in der Abgasstrecke.The object of the invention is to detect such leaks in the exhaust system.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß innerhalb der Abgasstrecke in einem Abstand voneinander mindestens zwei Lambdasonden angeordnet sind, deren Signa­ le zu einem Steuergerät geführt sind, das bei ausschließ­ lich aufgrund eines Anstiegs der Sauerstoffkonzentration auftretender Abweichung der beiden Signale voneinander ein Fehlersignal erzeugt, wobei die Vergleichsmessung der Lambdasignale während Unterdruckphasen des Motorkennfeldes erfolgt.This object is achieved according to the invention in that within the exhaust route at a distance from each other at least two lambda probes are arranged, the Signa le are led to a control unit that excludes due to an increase in oxygen concentration occurring deviation of the two signals from each other Error signal generated, the comparison measurement of Lambda signals during negative pressure phases of the engine map he follows.

"Unterdruckphasen des Motorkennfeldes" bezeichnet solche Betriebszustände des Motors, bei denen zumindest zeitweise und zumindest örtlich begrenzt der Druck im Abgassystem den Atmosphärendruck unterschreitet."Vacuum phases of the engine map" denotes such Operating states of the engine, at least at times and at least locally limits the pressure in the exhaust system falls below atmospheric pressure.

Die Erfindung unterscheidet sich insofern vom Stand der Technik, als die Differenzmessung zwischen den Signalen der beiden Lambdasonden eine unterschiedliche Sauerstoff­ konzentration an den Orten der beiden Lambdasonden an­ zeigt. Dies ist ein Hinweis auf eine Undichtigkeit in der Abgasstrecke. Hieraus läßt sich ein Fehlersignal als Diagnosesignal oder Alarmsignal ableiten. Die Erfindung ermöglicht so die neuerdings geforderte Eigendiagnose des Systems. The invention differs from the prior art Technique, as the difference measurement between the signals of the two lambda probes a different oxygen concentration at the locations of the two lambda sensors shows. This is an indication of a leak in the Exhaust system. From this, an error signal can be used as Derive diagnostic signal or alarm signal. The invention enables the recently required self-diagnosis of the Systems.  

Eine möglichst vollständige Überwachung der Abgasstrecke ist dadurch möglich, daß die eine Lambdasonde möglichst nahe dem Auslaßventil des Verbrennungsmotors und die zweite Lambdasonde möglichst nahe vor dem Dreiwegekataly­ sator angeordnet ist.The most complete possible monitoring of the exhaust route is possible that the one lambda probe if possible near the exhaust valve of the internal combustion engine and the second lambda sensor as close as possible before the three-way catalytic converter sator is arranged.

Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand der Zeichnung erläutert, die schematisch einen Verbrennungsmotor mit einer Überwachungsvorrichtung dar­ stellt.An embodiment of the invention is as follows explained with reference to the drawing, which schematically a Combustion engine with a monitoring device poses.

Von einem Verbrennungsmotor 1 ist ein Zylinder 2 mit einem Verbrennungsraum 3, einem Einlaßventil 4 im Anschluß an einen Gemischbildner 5 sowie einem Auslaßventil 6 darge­ stellt, an das eine Abgasstrecke 7 sowie ein Katalysator 8 zur Abgasreinigung anschließen. Diese Darstellung gilt im Prinzip auch für einen Mehrzylindermotor. Innerhalb der Abgasstrecke 7 sind zwei Lambdasonden 9 und 10 angeordnet, die über die Sauerstoffkonzentration das Luft-Kraftstoff- Verhältnis erfassen und dadurch eine Regelung des Motorbe­ triebs im Sinne einer stöchiometrischen Verbrennung ermög­ lichen. Der Abstand der Lambdasonden 9 und 10 innerhalb der Abgasstrecke ist nur schematisch zu verstehen. Die Lambdasonde 9 ist möglichst nahe dem Auslaßventil 6 und die Lambdasonde 10 möglichst nahe dem Dreiwegekatalysator 8 angeordnet, damit möglichst die gesamte Abgasstrecke überwacht werden kann. From an internal combustion engine 1 is a cylinder 2 with a combustion chamber 3 , an inlet valve 4 following a mixture generator 5 and an exhaust valve 6 Darge provides, to which an exhaust gas section 7 and a catalyst 8 connect for exhaust gas purification. In principle, this representation also applies to a multi-cylinder engine. Within the exhaust gas path 7 , two lambda probes 9 and 10 are arranged, which detect the air-fuel ratio via the oxygen concentration and thereby enable control of the engine operation in the sense of stoichiometric combustion. The distance between the lambda probes 9 and 10 within the exhaust gas section is only to be understood schematically. The lambda probe 9 is arranged as close as possible to the exhaust valve 6 and the lambda probe 10 as close as possible to the three-way catalytic converter 8 so that the entire exhaust gas path can be monitored as far as possible.

Die Ausgangssignale der Lambdasonden 9 und 10 werden einem Steuergerät 11 mit einer Fehleranzeige zugeführt, das auch weitere Motorkenndaten erfaßt und auswertet. Das Steuerge­ rät 11 regelt oder steuert den Motorbetrieb, was nicht Gegenstand der Erfindung ist.The output signals of the lambda probes 9 and 10 are fed to a control unit 11 with an error display, which also detects and evaluates further engine characteristics. The Steuerge advises 11 regulates or controls the engine operation, which is not the subject of the invention.

Innerhalb des Steuergerätes 11 werden die Signale der Lambdasonden 9 und 10 durch Differenzbildung miteinander verglichen. Abweichungen der Signale der Lambdasonden voneinander sind ein Hinweis auf eine Leckage innerhalb der Abgasstrecke. Eine derartige Leckage ist besonders in Unterdruckphasen des Motorbetriebs nachweisbar, wo infolge der Pulsationen aufgrund des intermittierenden Betriebs hochsauerstoffhaltige Außenluft in die Abgasstrecke 7 eintreten kann. Beim Vorhandensein einer signifikanten Abweichung wird von dem Steuergerät 11 ein Fehlersignal oder Alarmsignal abgegeben, das für Diagnosezwecke eine Leckage anzeigt und eine Werkstattüberprüfung nahelegt oder erforderlich macht. Das Fehlersignal kann von dem Fahrer des Fahrzeugs nicht gelöscht werden.Within the control unit 11 , the signals of the lambda probes 9 and 10 are compared with one another by forming the difference. Deviations of the signals of the lambda sensors from each other are an indication of a leak within the exhaust gas path. Such a leak is particularly detectable in negative pressure phases of engine operation, where, due to the pulsations due to the intermittent operation, outside air containing high oxygen can enter the exhaust gas section 7 . If there is a significant deviation, the control unit 11 emits an error signal or alarm signal that indicates a leak for diagnostic purposes and suggests a workshop check or makes it necessary. The driver of the vehicle cannot delete the error signal.

Claims (3)

1. Überwachungsvorrichtung für die Leckage von Abgaslei­ tungen an Verbrennungsmotoren mit mindestens einer Lambdasonde in der Abgasstrecke, dadurch gekennzeich­ net, daß innerhalb der Abgasstrecke (7) in einem Ab­ stand voneinander mindestens zwei Lambdasonden (9, 10) angeordnet sind, deren Signale zu einem Steuergerät (11) geführt sind, das bei ausschließlich aufgrund eines Anstiegs der Sauerstoffkonzentration auftreten­ der Abweichung der beiden Signale voneinander ein Feh­ lersignal erzeugt, wobei die Vergleichsmessung der Lambdasignale während Unterdruckphasen des Motorkenn­ feldes erfolgt.1. Monitoring device for the leakage of exhaust gas lines on internal combustion engines with at least one lambda probe in the exhaust gas path, characterized in that within the exhaust gas path ( 7 ) from one another stood at least two lambda probes ( 9 , 10 ), the signals of which are arranged at one Control unit ( 11 ) are guided, which, when there is only an increase in the oxygen concentration, the deviation of the two signals from one another generates an error signal, the comparative measurement of the lambda signals taking place during negative pressure phases of the engine map. 2. Überwachungsvorrichtung nach Anspruch 1, dadurch ge­ kennzeichnet, daß als Fehlersignal ein nichtlöschbares Diagnosesignal erzeugt wird.2. Monitoring device according to claim 1, characterized ge indicates that a non-erasable error signal Diagnostic signal is generated. 3. Überwachungsvorrichtung nach Anspruch 1 oder 2, da­ durch gekennzeichnet, daß die eine Lambdasonde (9) möglichst nahe dem Auslaßventil (6) des Verbrennungs­ motors (1) und die zweite Lambdasonde (10) möglichst nahe vor dem Dreiwegekatalysator (8) angeordnet ist.3. Monitoring device according to claim 1 or 2, characterized in that the one lambda sensor ( 9 ) as close as possible to the exhaust valve ( 6 ) of the internal combustion engine ( 1 ) and the second lambda sensor ( 10 ) is arranged as close as possible in front of the three-way catalyst ( 8 ) .
DE4318640A 1992-06-13 1993-06-04 Monitoring system for leakage of exhaust gas pipes at IC engines - uses at least two lambda probes arranged at distance from each other within gas exhaust section and their output signals are led to control unit. Withdrawn DE4318640A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4318640A DE4318640A1 (en) 1992-06-13 1993-06-04 Monitoring system for leakage of exhaust gas pipes at IC engines - uses at least two lambda probes arranged at distance from each other within gas exhaust section and their output signals are led to control unit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4219453 1992-06-13
DE4318640A DE4318640A1 (en) 1992-06-13 1993-06-04 Monitoring system for leakage of exhaust gas pipes at IC engines - uses at least two lambda probes arranged at distance from each other within gas exhaust section and their output signals are led to control unit.

Publications (1)

Publication Number Publication Date
DE4318640A1 true DE4318640A1 (en) 1993-12-16

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DE4318640A Withdrawn DE4318640A1 (en) 1992-06-13 1993-06-04 Monitoring system for leakage of exhaust gas pipes at IC engines - uses at least two lambda probes arranged at distance from each other within gas exhaust section and their output signals are led to control unit.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0719931A1 (en) * 1994-12-26 1996-07-03 Hitachi, Ltd. Exhaust control device of internal combustion engine
DE10147977A1 (en) * 2001-09-28 2003-04-10 Volkswagen Ag Method for detecting a leak in the intake port of an internal combustion engine and a correspondingly configured internal combustion engine
DE102009020118B3 (en) * 2009-05-06 2010-07-22 Audi Ag Method for verifying sealability of selected exhaust valve of selected cylinder in internal combustion engine in motor vehicle, involves concluding sealability of valve based on measured values of lambda sensor in one of exhaust gas strands
CN109262235A (en) * 2018-08-31 2019-01-25 芜湖中瑞模具有限公司 Engine tube gas sealing mechanism

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0719931A1 (en) * 1994-12-26 1996-07-03 Hitachi, Ltd. Exhaust control device of internal combustion engine
DE10147977A1 (en) * 2001-09-28 2003-04-10 Volkswagen Ag Method for detecting a leak in the intake port of an internal combustion engine and a correspondingly configured internal combustion engine
US6895934B2 (en) 2001-09-28 2005-05-24 Volkswagen Aktiengesellschaft Method for detection of a leak in the intake manifold of an internal combustion engine and internal combustion engine setup accordingly
DE102009020118B3 (en) * 2009-05-06 2010-07-22 Audi Ag Method for verifying sealability of selected exhaust valve of selected cylinder in internal combustion engine in motor vehicle, involves concluding sealability of valve based on measured values of lambda sensor in one of exhaust gas strands
CN109262235A (en) * 2018-08-31 2019-01-25 芜湖中瑞模具有限公司 Engine tube gas sealing mechanism

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