EP0411173A1 - Error-detecting arrangement and method for a fuel tank ventilation system - Google Patents

Error-detecting arrangement and method for a fuel tank ventilation system Download PDF

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Publication number
EP0411173A1
EP0411173A1 EP89114122A EP89114122A EP0411173A1 EP 0411173 A1 EP0411173 A1 EP 0411173A1 EP 89114122 A EP89114122 A EP 89114122A EP 89114122 A EP89114122 A EP 89114122A EP 0411173 A1 EP0411173 A1 EP 0411173A1
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EP
European Patent Office
Prior art keywords
signal
arrangement
error
error detection
detection according
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Granted
Application number
EP89114122A
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German (de)
French (fr)
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EP0411173B1 (en
Inventor
Gerhard Dipl.-Phys. Mader
Hans Dipl.-Phys. Meixner
Hans Dipl.-Ing. Schreiber
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Siemens AG
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Siemens AG
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Priority to ES198989114122T priority Critical patent/ES2037920T3/en
Priority to EP89114122A priority patent/EP0411173B1/en
Priority to DE8989114122T priority patent/DE58903128D1/en
Priority to US07/558,674 priority patent/US5085197A/en
Publication of EP0411173A1 publication Critical patent/EP0411173A1/en
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Publication of EP0411173B1 publication Critical patent/EP0411173B1/en
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    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0809—Judging failure of purge control system

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • the fuel vapors generated in the fuel tank are stored in an activated carbon filter and supplied to the combustion chamber of the engine at intervals after opening a ventilation valve.
  • the figure shows a schematic representation of the elements of the tank ventilation system.
  • the fuel generated in tank 1 vapors are passed through a connecting line 11 into the activated carbon filter 2.
  • a connecting line 21 leads from the activated carbon filter 2 via a tank ventilation valve 3 to the intake tract 51 of the internal combustion engine 5.
  • the tank ventilation valve 3 can be actuated electrically by a control signal and is controlled by the control unit 4.
  • a flow sensor 7 Between the activated carbon filter 2 and the tank ventilation valve 3 there is a flow sensor 7, which emits a flow signal to the control unit 4 when there is a gas flow in the connecting line 21.
  • the proper functioning of the tank ventilation is described below.
  • the fuel 12 located in the fuel tank 1 evaporates and is conducted via the connecting line 11 into the filter insert 23 of the activated carbon filter 2.
  • the filter insert 23 has a limited absorption capacity and must therefore be emptied with purging air 6 at certain time intervals.
  • the tank ventilation valve 3 is opened by the control device 4.
  • the negative pressure prevailing in the intake tract 51 of the internal combustion engine 5 continues via the connecting line 21, the tank ventilation valve 3 and a pressure relief valve 211 into the activated carbon filter 2.
  • the negative pressure prevailing in the activated carbon filter 2 causes the purge air 6 to enter the activated carbon filter 2 via the air inlet opening 22 and flow through the filter insert 23.
  • the fuel vapors bound in the filter insert 23 are emitted and reach the intake tract 51 of the internal combustion engine 5.
  • the flow sensor 7 detects whether gas is flowing out of the activated carbon filter 2.
  • the pressure relief valve 211 prevents the pressure increases occurring in the dynamic operation of the internal combustion engine 5 in the intake tract 51 - known to the person skilled in the art as pulsations or resonances - reaching the activated carbon filter 2.
  • the control unit 4 therefore recognizes the present fault situation by the fact that, when the tank ventilation valve 3 is open, there is no change in the values supplied by the lambda probe 521. The case may occur that after actuation of the tank ventilation valve 3, the mixture supplied to the intake tract 51 happens to have exactly the same distribution of air and fuel components as the mixture supplied to the internal combustion engine by a mixture formation device, not shown here. There will then be no change in the probe signals in the first moment, but with continued flushing of the filter insert 23 the ratio between air and fuel components changes, which is then reflected in a change in the probe signals.
  • the tank ventilation valve 3 does not open - error (A) - or does not close - error (B).
  • Tank vent valve 3 If the tank ventilation valve 3 is not opened, the detects Flow sensor 7 no air flow. An error is detected from the logical link "Tank vent valve 3 open - no flow signal from flow sensor 7 ⁇ . If the tank vent valve 3 is not closed, the logical link" Tank vent valve closed - flow sensor 7 emits signal "- detects an error.
  • control unit 4 recognizes from the logical link "tank ventilation valve open - flow sensor 7 does not supply a flow signal", that there is an error.
  • a thermal mass flow sensor as the flow sensor 7. Because of the self-regulating effect in ceramic PTC thermistors and the associated low circuit complexity, a ceramic PTC thermistor is preferably used as flow sensor 7.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

Mit dem vorliegenden Tankentlüftungssystem, bestehend aus einem Kraftstofftank (1), einem Aktivkohlefilter (2), einem Steuergerät (4), einer Lambda-Sonde (521), einem Tankentlüftungsventil (3) und einem Strömungssensor (7), können Fehler an den Verbindungsleitungen und dem Entlüftungsventil sofort erkannt werden. Zum Erkennen des Fehlers sind Mittel vorgesehen, die die ankommenden Signale von der Lambda-Sonde und dem Strömungssensor mit den ausgehenden Steuersignalen für das Tankentlüftungsventil auf unplausiblen Verlauf untersuchen. Bei erkanntem Fehler wird das Fehlersignal gespeichert. Als Strömungssensor wird vorzugsweise ein keramischer Kaltleiter verwendet.With the present tank ventilation system, consisting of a fuel tank (1), an activated carbon filter (2), a control unit (4), a lambda probe (521), a tank ventilation valve (3) and a flow sensor (7), errors can be made in the connecting lines and the vent valve can be recognized immediately. To detect the error, means are provided which examine the incoming signals from the lambda probe and the flow sensor with the outgoing control signals for the tank ventilation valve for an implausible course. If an error is detected, the error signal is saved. A ceramic thermistor is preferably used as the flow sensor.

Description

Die Erfindung bezieht sich auf ein Verfahren gemäß dem Oberbe­griff des Schutzanspruches 1.The invention relates to a method according to the preamble of claim 1.

Bei bekannten Tankentlüftungssystemen werden die im Kraftstoff­tank entstehenden Kraftstoffdämpfe in einem Aktivkohlefilter gespeichert und in zeitlichen Abständen nach Öffnen eines Entlüftungsventils dem Brennraum des Motors zugeführt.In known tank ventilation systems, the fuel vapors generated in the fuel tank are stored in an activated carbon filter and supplied to the combustion chamber of the engine at intervals after opening a ventilation valve.

Bei den bekannten Tankentlüftungssystemen können nun Fehler an den Verbindungsleitungen und dem Entlüftungsventil auftreten, ohne daß jeder Fehler sofort erkannt wird. Die Verbindungs­leitungen können dabei verstopft oder undicht sein, das Entlüf­tungsventil kann nicht mehr öffnen oder schließen. Das hat zur Folge, daß bis zur zufälligen Entdeckung der Fehler, das Tank­entlüftungssystem nicht richtig arbeitet und Kraftstoffdämpfe in die Atmosphäre entweichen.In the known tank ventilation systems, errors can now occur on the connecting lines and the ventilation valve without any error being recognized immediately. The connecting lines can be blocked or leaky, the vent valve can no longer open or close. As a result, until the faults are discovered accidentally, the tank ventilation system does not work properly and fuel vapors escape into the atmosphere.

Es ist daher eine Aufgabe der Erfindung ein Tankentlüftungs­system zu schaffen, bei welchem Fehler im System möglichst un­verzüglich erkannt werden.It is therefore an object of the invention to provide a tank ventilation system in which faults in the system are recognized as quickly as possible.

Diese Aufgabe wird durch die im Kennzeichen des Anspruches 1 genannten Merkmale gelöst.This object is achieved by the features mentioned in the characterizing part of claim 1.

Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Developments of the invention are the subject of the dependent claims.

Nachfolgend wird die Erfindung anhand der Bezugszeichen/Be­griffsliste und einer Figur näher erläutert.The invention is explained in more detail below on the basis of the reference symbols / list of terms and a figure.

Die Figur zeigt in schematischer Darstellung die Elemente des Tankentlüftungssystems. Die im Tank 1 entstehenden Kraftstoff­ dämpfe werden über eine Anschlußleitung 11 in den Aktivkohle­filter 2 geleitet. Aus dem Aktivkohlefilter 2 führt eine Ver­bindungsleitung 21 über ein Tankentlüftungsventil 3 zum Ansaug­trakt 51 der Brennkraftmaschine 5. Das Tankentlüftungsventil 3 ist durch ein Steuersignal elektrisch betätigbar und wird von dem Steuergerät 4 angesteuert. Zwischen Aktivkohlefilter 2 und Tankentlüftungsventil 3 sitzt ein Strömungssensor 7, der bei einer Gasströmung in der Verbindungsleitung 21 ein Strömungsi­gnal an das Steuergerät 4 abgibt. Im Abgastrakt 52 sitzt eine Lambda-Sonde 521, die ein Sondensignal an das Steuergerät 4 liefert.The figure shows a schematic representation of the elements of the tank ventilation system. The fuel generated in tank 1 vapors are passed through a connecting line 11 into the activated carbon filter 2. A connecting line 21 leads from the activated carbon filter 2 via a tank ventilation valve 3 to the intake tract 51 of the internal combustion engine 5. The tank ventilation valve 3 can be actuated electrically by a control signal and is controlled by the control unit 4. Between the activated carbon filter 2 and the tank ventilation valve 3 there is a flow sensor 7, which emits a flow signal to the control unit 4 when there is a gas flow in the connecting line 21. In the exhaust tract 52 there is a lambda probe 521 which delivers a probe signal to the control unit 4.

Nachfolgend wird das ordnungsgemäße Funktionieren der Tankent­lüftung beschrieben. Der im Kraftstofftank 1 befindliche Kraft­stoff 12 verdampft und wird über die Anschlußleitung 11 in den Filtereinsatz 23 des Aktivkohlefilters 2 geleitet. Der Fil­tereinsatz 23 hat eine begrenzte Aufnahmekapazität und muß da­her in gewissen zeitlichen Abständen mit Spülluft 6 entleert werden. Dazu wird das Tankentlüftungsventil 3 durch das Steuer­gerät 4 geöffnet. Der im Ansaugtrakt 51 der Brennkraftmaschine 5 herrschende Unterdruck setzt sich über die Verbindungsleitung 21, das Tankentlüftungsventil 3 und ein Überdruckventil 211 in den Aktivkohlefilter 2 fort. Der im Aktivkohlefilter 2 herr­schende Unterdruck bewirkt, daß Spülluft 6 über die Luftein­trittsöffnung 22 in den Aktivkohlefilter 2 gelangt und den Filtereinsatz 23 durchströmt. Dabei werden die im Filtereinsatz 23 gebundenen Kraftstoffdämpfe abgegeben und gelangen bis in den Ansaugtrakt 51 der Brennkraftmaschine 5. Der Strömungssen­sor 7 detektiert, ob Gas aus dem Aktivkohlefilter 2 ausströmt. Das Überdruckventil 211 verhindert dabei, daß die im dynami­schen Betrieb der Brennkraftmaschine 5 auftretenden Drucküber­höhungen im Ansaugtrakt 51 - dem Fachmann als Pulsationen bzw. Resonanzen bekannt - bis in den Aktivkohlefilter 2 gelangen.The proper functioning of the tank ventilation is described below. The fuel 12 located in the fuel tank 1 evaporates and is conducted via the connecting line 11 into the filter insert 23 of the activated carbon filter 2. The filter insert 23 has a limited absorption capacity and must therefore be emptied with purging air 6 at certain time intervals. For this purpose, the tank ventilation valve 3 is opened by the control device 4. The negative pressure prevailing in the intake tract 51 of the internal combustion engine 5 continues via the connecting line 21, the tank ventilation valve 3 and a pressure relief valve 211 into the activated carbon filter 2. The negative pressure prevailing in the activated carbon filter 2 causes the purge air 6 to enter the activated carbon filter 2 via the air inlet opening 22 and flow through the filter insert 23. The fuel vapors bound in the filter insert 23 are emitted and reach the intake tract 51 of the internal combustion engine 5. The flow sensor 7 detects whether gas is flowing out of the activated carbon filter 2. The pressure relief valve 211 prevents the pressure increases occurring in the dynamic operation of the internal combustion engine 5 in the intake tract 51 - known to the person skilled in the art as pulsations or resonances - reaching the activated carbon filter 2.

Für den Fall, daß die Anschlußleitung 11 undicht ist, gelangen an der undichten Stelle Kraftstoffdämpfe in die Außenluft. Ist die Anschlußleitung 11 hingegen verstopft, so gelangen die Kraftstoffdämpfe durch das Überdruckventil 13 des Kraftstoff­tanks 1 an die Außenluft. Bei einer Störung in oder an der An­schlußleitung 11 gelangt somit kein Kraftstoffdampf in den Ak­tivkohlefilter 2. Wird nun durch Betätigung des Tankentlüftungs­ventils 3 der Aktivkohlefilter 2 gespült, so enthält die dem An­saugtrakt 51 zugeführte Luft keine Kraftstoffanteile. Bei norma­lem Funktionieren der Tankentlüftung würden aber Kraftstoffan­teile dem Motor zugeführt werden, was sich in einem Ändern des von der Lambda-Sonde 521 an das Steuergerät 4 gelieferten Son­densignals bemerkbar machen würde. Den vorliegenden Fehlerfall erkennt daher das Steuergerät 4 daran, daß bei geöffnetem Tankentlüftungsventil 3 keine Änderung der von der Lambda-Sonde 521 gelieferten Werte erfolgt. Es kann dabei der Fall auftre­ten, daß nach Betätigung des Tankentlüftungsventils 3 das dem Ansaugtrakt 51 zugeführte Gemisch zufällig exakt die gleiche Verteilung von Luft und Kraftstoffanteilen besitzt, wie das von einer hier nicht gezeigten Gemischbildungseinrichtung an die Brennkraftmaschine gelieferte Gemisch. Es wird sich dann zwar im ersten Moment keine Änderung der Sondensignale ergeben, aber mit fortgesetzter Spülung des Filtereinsatzes 23 verändert sich das Verhältnis zwischen Luft und Kraftstoffanteilen, was sich dann in einer Änderung der Sondensignale bemerkbar macht.In the event that the connecting line 11 is leaking, fuel vapors get into the outside air at the leak. Is on the other hand, the connecting line 11 is blocked, the fuel vapors reach the outside air through the pressure relief valve 13 of the fuel tank 1. In the event of a fault in or on the connecting line 11, fuel vapor thus does not enter the activated carbon filter 2. If the activated carbon filter 2 is now flushed by actuating the tank ventilation valve 3, the air supplied to the intake tract 51 contains no fuel components. If the tank ventilation functioned normally, however, fuel components would be supplied to the engine, which would be reflected in a change in the probe signal supplied by the lambda probe 521 to the control unit 4. The control unit 4 therefore recognizes the present fault situation by the fact that, when the tank ventilation valve 3 is open, there is no change in the values supplied by the lambda probe 521. The case may occur that after actuation of the tank ventilation valve 3, the mixture supplied to the intake tract 51 happens to have exactly the same distribution of air and fuel components as the mixture supplied to the internal combustion engine by a mixture formation device, not shown here. There will then be no change in the probe signals in the first moment, but with continued flushing of the filter insert 23 the ratio between air and fuel components changes, which is then reflected in a change in the probe signals.

Wenn das Teilstück 212 der Verbindungsleitung 21 zwischen Aktiv­kohlefilter und Tankentlüftungsventil 3 verstopft oder undicht ist, wirkt kein Unterdruck mehr am Aktivkohlefilter 2. Der Strömungssensor 9 detektiert daher keine Strömung mehr. Das Steuergerät 4 erkennt an der logischen Verknüpfung "Tankentlüf­tungsventil geöffnet - Strömungssensor 7 liefert kein Signal", daß ein Fehler vorliegt.If the section 212 of the connecting line 21 between the activated carbon filter and the tank ventilation valve 3 is clogged or leaky, there is no longer a vacuum on the activated carbon filter 2. The flow sensor 9 therefore no longer detects any flow. The control unit 4 recognizes from the logical link "tank ventilation valve open - flow sensor 7 does not provide a signal" that there is an error.

Am Tankentlüftungsventil 3 können zwei Arten von Defekten auf­treten: Das Tankentlüftungsventil 3 öffnet nicht - Fehler (A) - oder schließt nicht - Fehler (B).Two types of defects can occur on the tank ventilation valve 3: The tank ventilation valve 3 does not open - error (A) - or does not close - error (B).

Bei Nichtöffnen des Tankentlüftungsventils 3 detektiert der Strömungssensor 7 keinen Luftstrom. Aus der logischen Verknüp­fung "Tankentlüftungsventil 3 geöffnet - kein Strömungssignal von Strömungssensor 7˝ wird ein Fehler erkannt. Bei Nichtschlie­ßen des Tankentlüftungsventils 3 wird aus der logischen Ver­knüpfung "Tankentlüftungsventil geschlossen -Strömungssensor 7 gibt Signal ab" - ein Fehler erkannt.If the tank ventilation valve 3 is not opened, the detects Flow sensor 7 no air flow. An error is detected from the logical link "Tank vent valve 3 open - no flow signal from flow sensor 7˝. If the tank vent valve 3 is not closed, the logical link" Tank vent valve closed - flow sensor 7 emits signal "- detects an error.

Bei einem Fehler im Teilstück 213 der Verbindungsleitung 21 zwi­schen Ventil 3 und Ansaugtrakt 51 verhält es sich wie bei einem Fehler im Teil 212 der Verbindungsleitung 21. Auch hier erkennt das Steuergerät 4 aus der logischen Verknüpfung "Tankentlüf­tungsventil geöffnet - Strömungssensor 7 liefert kein Strömungs­signal", daß ein Fehler vorliegt.In the event of an error in section 213 of connecting line 21 between valve 3 and intake tract 51, the situation is the same as for an error in part 212 of connecting line 21. Here too, control unit 4 recognizes from the logical link "tank ventilation valve open - flow sensor 7 does not supply a flow signal", that there is an error.

Hinsichtlich des technischen Aufwandes bietet sich an, als Strömungssensor 7 einen thermischen Massenstromsensor zu ver­wenden. Aufgrund des Selbstregelungseffektes bei keramischen Kaltleitern und des damit verbundenen geringen schaltungstech­nischen Aufwandes wird als Strömungssensor 7 vorzugsweise ein keramischer Kaltleiter eingesetzt.With regard to the technical effort, it is advisable to use a thermal mass flow sensor as the flow sensor 7. Because of the self-regulating effect in ceramic PTC thermistors and the associated low circuit complexity, a ceramic PTC thermistor is preferably used as flow sensor 7.

Bezugszeichenliste / BegriffslisteList of reference symbols / list of terms

  • SL SondensignalSL probe signal
  • SG StrömungssignalSG flow signal
  • SI SteuersignalSI control signal
  • 1 Kraftstofftank1 fuel tank
  • 11 Anschlußleitung11 connecting line
  • 12 Kraftstoff12 fuel
  • 13 Überdruckventil13 pressure relief valve
  • 2 Aktivkohlefilter2 activated carbon filters
  • 21 Verbindungsleitung21 connecting line
  • 211 Überdruckventil211 pressure relief valve
  • 212 Teilstück212 section
  • 213 Teilstück213 section
  • 22 Lufteintrittsöffnung22 air inlet opening
  • 23 Filtereinsatz23 filter insert
  • 3 Tankentlüftungsventil3 tank vent valve
  • 4 Steuergerät4 control unit
  • 5 Brennkraftmaschine5 internal combustion engine
  • 51 Ansaugtrakt51 intake tract
  • 52 Auspuffssystem52 Exhaust system
  • 521 Lambda-Sonde521 lambda probe
  • 6 Spülluft6 purge air
  • 7 Strömungssensor7 flow sensor

Claims (12)

1. Anordnung zur Fehlererkennung bei einem Tankentlüfungssystem mit einem Kraftstofftank (1), einem Aktivkohlefilter (2), einem Steuergerät (4), einer Lambdasonde (521), die ein Sondensignal (SL) an das Steuergerät (4) abgibt, mit einem Tankentlüftungs­ventil (3), das durch ein Steuersignal (SI) vom Steuergerät (4) betätigbar ist, wobei
- der Aktivkohlefilter (2) einerseits mit dem Kraftstofftank (1) und andererseits über eine durch das Tankentlüftungsven­til (3) sperrbare Verbindungsleitung (21) mit dem Ansaugtrakt einer Brennkraftmaschine (5) verbunden ist,
dadurch gekennzeichnet,
- daß in der Verbindungsleitung (21) ein Strömungssensor (7) angeordnet ist, der bei einer Gasströmung ein Strömungssi­gnal (SG) an das Steuergerät (4) abgibt,
- daß Mittel zum Vergleich des Strömungssignals (SG) oder des Sondersignals (SL) einerseits und dem Steuersignal (SI) andererseits vorgesehen sind, die bei unplausiblem Verlauf dieser Signale ein Fehlersignal abgeben.1. Arrangement for error detection in a tank ventilation system with a fuel tank (1), an activated carbon filter (2), a control unit (4), a lambda sensor (521), which emits a probe signal (SL) to the control unit (4), with a tank ventilation valve (3) which can be actuated by a control signal (SI) from the control device (4), wherein
the activated carbon filter (2) is connected on the one hand to the fuel tank (1) and on the other hand via a connecting line (21) which can be blocked by the tank ventilation valve (3) to the intake tract of an internal combustion engine (5),
characterized,
- That a flow sensor (7) is arranged in the connecting line (21), which emits a flow signal (SG) to the control device (4) in the case of a gas flow,
- That means are provided for comparing the flow signal (SG) or the special signal (SL) on the one hand and the control signal (SI) on the other hand, which emit an error signal if these signals are implausible. 2. Anordnung zur Fehlererkennung nach Anspruch 1,
dadurch gekennzeichnet, daß
- bei erkanntem Fehler das Fehlersignal gespeichert wird.2. Arrangement for error detection according to claim 1,
characterized in that
- If an error is detected, the error signal is saved. 3. Anordnung zur Fehlererkennung nach Anspruch 1,
dadurch gekennzeichnet, daß
- ein Fehlersignal dann abgegeben wird, wenn das Steuergerät (4) ein Steuersignal (SI) zum Öffnen des Entlüftungsventils (3) abgibt, aber vom Strömungssensor (7) kein Strömungssi­gnal (SG) empfängt.3. Arrangement for error detection according to claim 1,
characterized in that
- An error signal is emitted when the control unit (4) emits a control signal (SI) for opening the vent valve (3), but receives no flow signal (SG) from the flow sensor (7). 4. Anordnung zur Fehlererkennung nach Anspruch 1,
dadurch gekennzeichnet, daß
- Fehlersignal dann abgegeben wird, wenn das Steuergerät (4) ein Steuersignal (SI) zum Schließen des Entlüftungsventils (3) abgibt, aber vom Strömungssensor (7) ein Strömungssignal (SG) empfängt.4. Arrangement for error detection according to claim 1,
characterized in that
- Error signal is emitted when the control unit (4) emits a control signal (SI) for closing the vent valve (3), but receives a flow signal (SG) from the flow sensor (7). 5. Anordnung zur Fehlererkennung nach Anspruch 1,
dadurch gekennzeichnet, daß
- ein Fehlersignal dann abgegeben wird, wenn das Steuergerät (4) ein Steuersignal (SI) zum Öffnen des Entlüftungsventils (3) abgibt, aber von der Lambda-Sonde (521) kein geändertes Sondensignal (SL) geliefert wird.5. Arrangement for error detection according to claim 1,
characterized in that
- An error signal is emitted when the control unit (4) emits a control signal (SI) for opening the vent valve (3), but no changed probe signal (SL) is supplied by the lambda probe (521). 6. Anordnung zur Fehlererkennung nach Anspruch 1,
dadurch gekennzeichnet, daß
- der Strömungssensor (7) zwischen Aktivkohlefilter (2) und Tankentlüftungsventil (3) angebracht ist.6. Arrangement for error detection according to claim 1,
characterized in that
- The flow sensor (7) between the activated carbon filter (2) and the tank ventilation valve (3) is attached. 7. Anordnung zur Fehlererkennung nach Anspruch 1,
dadurch gekennzeichnet, daß
- daß der Strömungssensor (7) ein Thermistor ist.7. Arrangement for error detection according to claim 1,
characterized in that
- That the flow sensor (7) is a thermistor. 8. Anordnung zur Fehlererkennung nach Anspruch 7,
dadurch gekennzeichnet, daß
- der Thermistor ein keramischer Kaltleiter ist.8. Arrangement for error detection according to claim 7,
characterized in that
- The thermistor is a ceramic thermistor. 9. Anordnung zur Fehlererkennung nach Anspruch 7,
dadurch gekennzeichnet, daß
- die Anschlußdrähte aus einer Eisen- Nickellegierung bestehen.9. Arrangement for error detection according to claim 7,
characterized in that
- The connecting wires consist of an iron-nickel alloy. 10. Anordnung zur Fehlererkennung nach Anspruch 7,
dadurch gekennzeichnet, daß
- dem Thermistor ein Vorwiderstand in Reihe geschaltet ist.10. Arrangement for error detection according to claim 7,
characterized in that
- A series resistor is connected in series to the thermistor. 11. Anordnung zur Fehlererkennung nach Anspruch 10,
dadurch gekennzeichnet, daß
- der Vorwiderstnd nicht der Gasströmung ausgesetzt ist.11. Arrangement for error detection according to claim 10,
characterized in that
- the series resistor is not exposed to the gas flow. 12. Anordnung zur Fehlererkennung nach Anspruch 10,
dadurch gekennzeichnet, daß
- der Vorwiderstand ein nicht linearer Widerstand ist, dessen Kennlinie die Abhängigkeit des Strömungssignals (S6) von der Umgebungstemperatur kompensiert.12. Arrangement for error detection according to claim 10,
characterized in that
- The series resistor is a non-linear resistor, the characteristic of which compensates for the dependence of the flow signal (S6) on the ambient temperature.
EP89114122A 1989-07-31 1989-07-31 Error-detecting arrangement and method for a fuel tank ventilation system Expired - Lifetime EP0411173B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES198989114122T ES2037920T3 (en) 1989-07-31 1989-07-31 PROVISION AND PROCEDURE FOR THE RECOGNITION OF DEFECTS IN A DEPOSIT VENTILATION SYSTEM.
EP89114122A EP0411173B1 (en) 1989-07-31 1989-07-31 Error-detecting arrangement and method for a fuel tank ventilation system
DE8989114122T DE58903128D1 (en) 1989-07-31 1989-07-31 ARRANGEMENT AND METHOD FOR DETECTING ERRORS IN A TANK BLEEDING SYSTEM.
US07/558,674 US5085197A (en) 1989-07-31 1990-07-26 Arrangement for the detection of deficiencies in a tank ventilation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89114122A EP0411173B1 (en) 1989-07-31 1989-07-31 Error-detecting arrangement and method for a fuel tank ventilation system

Publications (2)

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US5866500A (en) * 1994-08-03 1999-02-02 Toyota Jidosha Kabushiki Kaisha Process for producing exhaust-gas-purifying catalyst
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991015670A1 (en) * 1990-03-30 1991-10-17 Robert Bosch Gmbh Vapour venting system for vehicle fuel tanks and process for checking system operability
FR2674192A1 (en) * 1991-03-21 1992-09-25 Siemens Automotive Sa METHOD AND DEVICE FOR VERIFYING THE OPERATING STATE OF A SYSTEM FOR RECOVERING VAPORS FROM THE FUEL TANK OF A MOTOR VEHICLE.
WO1992016735A1 (en) * 1991-03-21 1992-10-01 Siemens Automotive S.A. Method and device for verifying the operating condition of a system for recovering vapours originating from the fuel tank of a motor vehicle
US5533493A (en) * 1991-03-21 1996-07-09 Siemens Automotive, S.A. Method and device for verifying the operating condition of a system for recovering vapors originating from the fuel tank of a motor vehicle
WO1992018765A1 (en) * 1991-04-17 1992-10-29 Robert Bosch Gmbh Process and device for monitoring the performance of a fuel tank ventilation system
US5265577A (en) * 1991-04-17 1993-11-30 Robert Bosch Gmbh Method and arrangement for checking the operability of a tank-venting system
DE4301230C2 (en) * 1992-02-20 2002-09-12 Environmental Syst Prod Method and device for automatically checking control systems for fuel evaporation in vehicles
DE4401887A1 (en) * 1993-01-29 1994-08-11 Siemens Ag Method for the diagnosis of components of a tank venting system
US5866500A (en) * 1994-08-03 1999-02-02 Toyota Jidosha Kabushiki Kaisha Process for producing exhaust-gas-purifying catalyst
DE19757345B4 (en) * 1996-12-24 2008-08-07 Denso Corp., Kariya Blowby gas duct abnormality detection system for internal combustion engines
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

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DE58903128D1 (en) 1993-02-04
US5085197A (en) 1992-02-04
EP0411173B1 (en) 1992-12-23
ES2037920T3 (en) 1993-07-01

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