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EP1013917A2 - Method for testing a tank purge system - Google Patents

Method for testing a tank purge system Download PDF

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Publication number
EP1013917A2
EP1013917A2 EP99123162A EP99123162A EP1013917A2 EP 1013917 A2 EP1013917 A2 EP 1013917A2 EP 99123162 A EP99123162 A EP 99123162A EP 99123162 A EP99123162 A EP 99123162A EP 1013917 A2 EP1013917 A2 EP 1013917A2
Authority
EP
European Patent Office
Prior art keywords
tank
cross
tank ventilation
correlation
filter device
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.)
Granted
Application number
EP99123162A
Other languages
German (de)
French (fr)
Other versions
EP1013917A3 (en
EP1013917B1 (en
Inventor
Jens Dr. Drückhammer
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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
Priority claimed from DE19908138A external-priority patent/DE19908138B4/en
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP1013917A2 publication Critical patent/EP1013917A2/en
Publication of EP1013917A3 publication Critical patent/EP1013917A3/en
Application granted granted Critical
Publication of EP1013917B1 publication Critical patent/EP1013917B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure

Definitions

  • the invention relates to a method for testing a tank ventilation system, in particular a motor vehicle, with those mentioned in the preamble of claim 1 Characteristics.
  • the function of the Tank ventilation system is monitored.
  • the switching means solenoid valve
  • the invention has for its object to a method of the generic type create a simple way to check a tank ventilation system is possible.
  • this object is achieved by a method with the method described in claim 1 mentioned features solved.
  • a control signal for the switching means with a measured value defining a state of the suction system is cross-correlated and a correlation coefficient is evaluated as a diagnostic signal of the tank ventilation system a very reliable diagnostic result is advantageously obtained.
  • Correlation method to determine the similarity of two curves, here the control signal and the the variable defining the suction system are reliable and easy to use handling procedures known. These procedures have no relevant influence the measured variables to be correlated, so that an influence on the operation of the Tank ventilation system or the entire internal combustion engine is not given for motor vehicles.
  • Such cross-correlation methods are also very robust, so that the release conditions for the implementation of the Procedure can be reduced to a minimum. Such release conditions are, in particular, parallel diagnostic methods or control or Regulation procedure, which is due to the cross correlation mentioned here could be affected.
  • the state of the Measurement system defining a suction pipe pressure or a Throttle position is used.
  • These parameters are easy to pick up and are already available in the usual equipment of motor vehicles.
  • the cross-correlation by an engine control unit of the motor vehicle is carried out, the measured variables can be tapped in a simple manner.
  • FIG. 1 shows a tank ventilation system 10.
  • the tank ventilation system 10 comprises one Connection line 12, a tank 14 with a suction system 16 a Internal combustion engine 18 connects.
  • the suction system 16 has a suction pipe 20, so that 22 combustion air can be sucked in by means of negative pressure from a source.
  • the Combustion air supply can be regulated with a throttle valve 24.
  • a tank ventilation valve 26 is integrated into the connecting line 12.
  • the Tank vent valve 26 is designed as an electromagnetic proportional valve that is controlled by a control signal 28.
  • the control signal 28 is from a Engine control unit provided and has a variable duty cycle.
  • a cross section of the connecting line 12 becomes corresponding to the duty cycle opened or closed.
  • the duty cycle of the control signal 28 is proportional to the opening cross section of the connecting line 12.
  • a connection 30 branches from the connecting line 12 to a filter device 32 from.
  • the filter device 32 is, for example, an activated carbon container 34 within which a bed of activated carbon 36 is arranged as a filter medium. From one of the Activated carbon 36 downstream collection space 38 leads a connection 40 to the outside.
  • a pressure sensor 42 is arranged, by means of which an intake manifold pressure is measured as measured variable 44.
  • the general function of the tank ventilation system 10 is as follows:
  • a pressure P 1 prevails inside the tank 14.
  • a pressure P 2 prevails in the intake manifold 20, while an ambient pressure P 3 is present. If the pressure P 1 in the tank 14 above the ambient pressure P 3 at, via the connecting line 12 and the connection 30 and the filtering means 32 a venting of the tank 14. Here, out fuel vapors through the activated carbon 36 and filtered by this and collected as a filter material . The cleaned air exits via connection 40 to the outside. If there is a negative pressure in the tank 14, that is to say the pressure P 1 is less than the pressure P 3 , air is sucked in via the connection 40, the filter device 32, the connection 30 and the connecting line 12 and transferred to the tank 14. Any filter material from the activated carbon 36 that flows along here is unproblematic since the tank 14 is closed in a pressure-tight manner.
  • the tank ventilation valve 26 opens in accordance with the pulse duty factor of the control signal 28. As a result, the pressure P 2 is present at the tank 14 and at the filter device 32. Since there is a negative pressure in the intake manifold 20, the pressure P 2 is lower than the pressure P 1 and the pressure P 3 . Due to this pressure drop, the fuel vapors from the tank 14 and the fuel vapors stored in the activated carbon 36 are sucked in via the opened tank ventilation valve 26 and fed to the combustion air of the internal combustion engine 18. They therefore burn during the combustion process.
  • the connecting line 12 is known to be flexible Form line (hose) so that any kinks or the like could also lead to cross-sectional narrowing.
  • the method according to the invention for testing the tank ventilation system 10 is explained with reference to FIG. 2.
  • the test procedure is initialized (field 52).
  • a query 54 is then used to check whether there are release conditions 56 for the test method.
  • release conditions 56 include, for example, control processes which run in parallel or diagnostic processes of other devices of the motor vehicle which run in parallel and which could be influenced by the test method 48.
  • the release check 56 includes, for example, the query 58 about the current suction pressure P 2 in accordance with the measurement result 44. For example, differences between a maximum and a minimum suction pressure are evaluated.
  • a stimulation signal 64 is supplied, which corresponds to the pulse duty factor of the control signal 28.
  • a stimulation signal +1 for activated tank ventilation valve 26 and -1 for uncontrolled tank ventilation valve 26 can be delivered.
  • a repeat test 68 is triggered by means of a signal 66. The number of measurement cycles carried out is compared with a predeterminable number.
  • the repeat test is triggered via signal 70. If the number of measurement cycles carried out is equal to the predetermined number, the diagnosis 74 is carried out via the signal 72. In diagnosis 74, a correlation coefficient of the correlation calculation 62 is checked. If this correlation coefficient has a value of 1, the control signal 28 and the measured variable 44 (intake manifold pressure) are identical in the sense of the correlation calculation. If, on the other hand, the correlation coefficient has a value of 0, there is no relationship between the scanning signal 28 and the measured variable 44, so that an error 76 is recognized. When error 76 is detected, a vehicle driver can be informed, for example by an optical signal, that the tank ventilation system 10 is defective.
  • a termination 78 of the method takes place, for example, if the test of the Release condition 56, a signal 80 is generated which indicates the absence of the defined release conditions. Furthermore, during the stimulation of the Control signal 28 or during the acquisition of the measured variable 44 Signal 82 are generated, which also leads to termination 78.
  • the signal 82 can be, for example, an error signal if the measured variable 44 is missing or implausible, Expiration of an intended total service life of the tank ventilation valve 26 and / or at Reaching the specified number of measuring cycles to be carried out during the Repeat test 68.
  • the test method 48 through reinitialization 52 again starts. If necessary, it can be provided that the test method 48 with each Restart of the internal combustion engine 18 expires.
  • another measured variable for example the position of the throttle valve 24 can also be used for the cross-correlation as the measured variable 44.
  • a signal can be tapped, for example via a potentiometer, which corresponds to the position of the throttle valve 24.
  • the cross correlation can be carried out passively or actively. With the passive Cross-correlation becomes the signals to be evaluated, here the control signal 28 and the measured variable 44, processed uninfluenced. With active cross correlation, the control signals 28 and measured variable 44 entering the cross-correlation Stimulation signals excited so that a sensitivity of the test method 48th can be increased.

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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)
  • Testing Of Engines (AREA)

Abstract

The method involves feeding volatile gas containing. hydrogen emanating from the tank (14) via a filter arrangement (32) in which it is collected. The filter arrangement is subjected to a vacuum to feed the filter material via a induction system (16) of an induction process into an internal combustion engine, whereby the connection between the filter arrangement and induction system is opened and closed by a clocked switching device. A drive signal for the switching device is cross-correlated with a measurement parameter defining the state of the induction system, and a correlation coefficient is evaluated as a diagnostic signal for the tank venting system.

Description

Die Erfindung betrifft ein Verfahren zum Prüfen eines Tankentlüftungssystems, insbesondere eines Kraftfahrzeuges, mit den im Oberbegriff des Anspruchs 1 genannten Merkmalen.The invention relates to a method for testing a tank ventilation system, in particular a motor vehicle, with those mentioned in the preamble of claim 1 Characteristics.

Es ist bekannt, in Kraftfahrzeuge Tankentlüftungssysteme vorzusehen, mittels denen ein Druckausgleich sowie eine Be- und Entlüftung eines Kraftstofftanks erfolgt. Hierbei ist der Tank über eine Leitung mit einer Sauganlage einer Verbrennungskraftmaschine verbunden. In diese Leitung ist ein getaktes ansteuerbares Schaltmittel, beispielsweise ein elektromagnetisches Ventil, eingebunden, mittels dem die Verbindung definiert geöffnet beziehungsweise geschlossen werden kann. Das Magnetventil wird hierbei mit einem Ansteuersignal mit einem einstellbaren Tastverhältnis angesteuert, so daß sich ein Öffnungsquerschnitt proportional zum Ansteuertastverhältnis ergibt. Die Verbindung zwischen dem Tank und der Sauganlage steht ferner mit einer Filtereinrichtung, beispielsweise einem Aktivkohlebehälter, in Verbindung. Diese Filtereinrichtung besitzt eine dem Filtermittel nachgeordnete Öffnung ins Freie. Steigt beispielsweise der Druck in dem Tank an, erfolgt über die Filtereinrichtung ein Druckausgleich. Hierbei werden in dem Tank sich befindende flüchtige kohlenwasserstoffhaltige Gase durch das Filtermittel (Aktivkohle) als Filtergut zurückgehalten. Herrscht im Tank ein Unterdruck, erfolgt ein Druckausgleich ebenfalls über die Filtereinrichtung. Eine Spülung der Filtereinrichtung zum Entfernen des Filtergutes erfolgt durch die Öffnung des Schaltmittels. Hierdurch wird die Filtereinrichtung durch den in der Sauganlage des Kraftfahrzeuges herrschenden Unterdruck beaufschlagt, so daß das Filtergut über das geöffneten Schaltmittel in die Sauganlage geführt wird und der Verbrennungsluft der Verbrennungskraftmaschine zugeführt wird.It is known to provide tank ventilation systems in motor vehicles, by means of which a Pressure equalization as well as a ventilation of a fuel tank takes place. Here is the tank via a line with a suction system of an internal combustion engine connected. In this line is a clocked controllable switching means, for example an electromagnetic valve, incorporated, by means of which the connection is defined can be opened or closed. The solenoid valve is included a control signal driven with an adjustable duty cycle, so that results in an opening cross section proportional to the drive duty cycle. The connection there is also a filter device between the tank and the suction system, for example, an activated carbon canister. This filter device has an opening downstream of the filter medium. For example, the pressure increases in the tank, the filter device compensates for pressure. Here, in volatile hydrocarbon-containing gases in the tank through the filter medium (Activated carbon) retained as filter material. If there is a negative pressure in the tank, a occurs Pressure equalization also via the filter device. A rinse of the filter device the filter material is removed by opening the switching means. Hereby the filter device through the in the suction system of the motor vehicle prevailing negative pressure, so that the filter material over the open Switching means is led into the suction system and the combustion air Internal combustion engine is supplied.

Aus Gründen des Umweltschutzes ist es erforderlich, daß die Funktion des Tankentlüftungssystems überwacht wird. Insbesondere ist ein sicheres getaktetes Schalten des Schaltmittels (Magnetventil) notwendig, damit die Filtereinrichtung in regelmäßigen Abständen gespült (gereinigt) werden kann. For reasons of environmental protection, it is necessary that the function of the Tank ventilation system is monitored. In particular, is a safe clocked Switching the switching means (solenoid valve) necessary so that the filter device in can be rinsed (cleaned) at regular intervals.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der gattungsgemäßen Art zu schaffen, mit dem in einfacher Weise eine Überprüfung eines Tankentlüftungssystems möglich ist.The invention has for its object to a method of the generic type create a simple way to check a tank ventilation system is possible.

Erfindungsgemäß wird diese Aufgabe durch ein Verfahren mit den im Anspruch 1 genannten Merkmalen gelöst. Dadurch, daß ein Ansteuersignal für das Schaltmittel mit einem, einen Zustand der Sauganlage definierenden Meßwert kreuzkorreliert wird und ein Korrelationskoeffizient als Diagnosesignal des Tankentlüftungssystems ausgewertet wird, wird vorteilhaft ein sehr sicheres Diagnoseergebnis erhalten. Korrelationsverfahren zur Ermittlung der Ähnlichkeit zweier Kurvenverläufe, hier des Ansteuersignals und der die Sauganlage definierenden Meßgröße, sind als zuverlässige und einfach zu handhabende Verfahren bekannt. Diese Verfahren üben keinen relevanten Einfluß auf die zu korrelierenden Meßgrößen aus, so daß ein Einfluß auf den Betrieb des Tankentlüftungssystems beziehungsweise der gesamten Verbrennungskraftmaschine bei Kraftfahrzeugen nicht gegeben ist. Derartige Kreuzkorrelationsverfahren sind ferner sehr robust, so daß einzuhaltende Freigabebedingungen für die Durchführung des Verfahrens auf ein Minimum reduziert werden können. Derartige Freigabebedingungen sind insbesondere parallel verlaufende Diagnoseverfahren beziehungsweise Steuer-oder Regelungsverfahren, die durch die hier angesprochene Kreuzkorrelation beeinträchtigt werden könnten.According to the invention, this object is achieved by a method with the method described in claim 1 mentioned features solved. The fact that a control signal for the switching means with a measured value defining a state of the suction system is cross-correlated and a correlation coefficient is evaluated as a diagnostic signal of the tank ventilation system a very reliable diagnostic result is advantageously obtained. Correlation method to determine the similarity of two curves, here the control signal and the the variable defining the suction system are reliable and easy to use handling procedures known. These procedures have no relevant influence the measured variables to be correlated, so that an influence on the operation of the Tank ventilation system or the entire internal combustion engine is not given for motor vehicles. Such cross-correlation methods are also very robust, so that the release conditions for the implementation of the Procedure can be reduced to a minimum. Such release conditions are, in particular, parallel diagnostic methods or control or Regulation procedure, which is due to the cross correlation mentioned here could be affected.

In bevorzugter Ausgestaltung der Erfindung ist vorgesehen, daß als den Zustand der Sauganlage definierende Meßgröße ein Saugrohrdruck oder eine Drosselklappenposition verwendet wird. Diese Meßgrößen sind einfach abzugreifen und stehen bei üblichen Ausstattungen von Kraftfahrzeugen bereits zur Verfügung. Insbesondere, wenn die Kreuzkorrelation durch ein Motorsteuergerät des Kraftfahrzeugs durchgeführt wird, können die Meßgrößen in einfacher Weise abgegriffen werden.In a preferred embodiment of the invention it is provided that as the state of the Measurement system defining a suction pipe pressure or a Throttle position is used. These parameters are easy to pick up and are already available in the usual equipment of motor vehicles. In particular, if the cross-correlation by an engine control unit of the motor vehicle is carried out, the measured variables can be tapped in a simple manner.

Weitere bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den übrigen, in den Unteransprüchen genannten Merkmalen.Further preferred refinements of the invention result from the remaining ones in the features mentioned in the subclaims.

Die Erfindung wird nachfolgend in einem Ausführungsbeispiel anhand der zugehörigen Zeichnungen näher erläutert. Es zeigen:

Figur 1
eine schematische Ansicht eines Tankentlüftungssystems und
Figur 2
ein Blockschaltbild für die Durchführung eines Verfahrens zum Prüfen des Tankentlüftungssystems.
The invention is explained in more detail in an exemplary embodiment with reference to the accompanying drawings. Show it:
Figure 1
a schematic view of a tank ventilation system and
Figure 2
a block diagram for the implementation of a method for testing the tank ventilation system.

Figur 1 zeigt ein Tankentlüftungssystem 10. Das Tankentlüftungssystem 10 umfaßt eine Verbindungsleitung 12, die einen Tank 14 mit einer Sauganlage 16 einer Verbrennungskraftmaschine 18 verbindet. Die Sauganlage 16 besitzt ein Saugrohr 20, so daß mittels Unterdruck von einer Quelle 22 Verbrennungsluft ansaugbar ist. Die Verbrennungsluftzufuhr ist mit einer Drosselklappe 24 regelbar.FIG. 1 shows a tank ventilation system 10. The tank ventilation system 10 comprises one Connection line 12, a tank 14 with a suction system 16 a Internal combustion engine 18 connects. The suction system 16 has a suction pipe 20, so that 22 combustion air can be sucked in by means of negative pressure from a source. The Combustion air supply can be regulated with a throttle valve 24.

In die Verbindungsleitung 12 ist ein Tankentlüftungsventil 26 integriert. Das Tankentlüftungsventil 26 ist als elektromagnetisches Proportionalventil ausgeführt, das von einem Ansteuersignal 28 angesteuert wird. Das Ansteuersignal 28 wird von einem Motorsteuergerät bereitgestellt und besitzt ein veränderbares Tastverhältnis. Entsprechend dem Tastverhältnis wird ein Querschnitt der Verbindungsleitung 12 geöffnet beziehungsweise geschlossen. Das Tastverhältnis des Ansteuersignals 28 ist proportional zum Öffnungsquerschnitt der Verbindungsleitung 12.A tank ventilation valve 26 is integrated into the connecting line 12. The Tank vent valve 26 is designed as an electromagnetic proportional valve that is controlled by a control signal 28. The control signal 28 is from a Engine control unit provided and has a variable duty cycle. A cross section of the connecting line 12 becomes corresponding to the duty cycle opened or closed. The duty cycle of the control signal 28 is proportional to the opening cross section of the connecting line 12.

Von der Verbindungsleitung 12 zweigt eine Verbindung 30 zu einer Filtereinrichtung 32 ab. Die Filtereinrichtung 32 ist beispielsweise ein Aktivkohlebehälter 34, innerhalb dem eine Schüttung von Aktivkohle 36 als Filtermittel angeordnet ist. Von einem der Aktivkohle 36 nachgeordneten Sammelraum 38 führt eine Verbindung 40 ins Freie.A connection 30 branches from the connecting line 12 to a filter device 32 from. The filter device 32 is, for example, an activated carbon container 34 within which a bed of activated carbon 36 is arranged as a filter medium. From one of the Activated carbon 36 downstream collection space 38 leads a connection 40 to the outside.

In dem Saugrohr 20 ist ein Drucksensor 42 angeordnet, mittels dem ein Saugrohrdruck als Meßgröße 44 abgegriffen wird.In the intake manifold 20, a pressure sensor 42 is arranged, by means of which an intake manifold pressure is measured as measured variable 44.

Die allgemeine Funktion des Tankentlüftungssystems 10 ist folgende:The general function of the tank ventilation system 10 is as follows:

Innerhalb des Tanks 14 herrscht ein Druck P1. Im Saugrohr 20 herrscht ein Druck P2, während ein Umgebungsdruck P3 anliegt. Steigt der Druck P1 im Tank 14 über den Umgebungsdruck P3 an, erfolgt über die Verbindungsleitung 12 sowie die Verbindung 30 und die Filtereinrichtung 32 eine Entlüftung des Tanks 14. Hierbei werden Kraftstoffdämpfe über die Aktivkohle 36 geführt und von dieser gefiltert und als Filtergut gesammelt. Die gereinigte Luft tritt über die Verbindung 40 ins Freie aus. Herrscht im Tank 14 ein Unterdruck, das heißt der Druck P1 ist kleiner als der Druck P3, wird über die Verbindung 40 die Filtereinrichtung 32, die Verbindung 30 und die Verbindungsleitung 12 Luft angesaugt und in den Tank 14 überführt. Hierbei eventuell mitströmendes Filtergut aus der Aktivkohle 36 ist unproblematisch, da der Tank 14 druckdicht verschlossen ist.A pressure P 1 prevails inside the tank 14. A pressure P 2 prevails in the intake manifold 20, while an ambient pressure P 3 is present. If the pressure P 1 in the tank 14 above the ambient pressure P 3 at, via the connecting line 12 and the connection 30 and the filtering means 32 a venting of the tank 14. Here, out fuel vapors through the activated carbon 36 and filtered by this and collected as a filter material . The cleaned air exits via connection 40 to the outside. If there is a negative pressure in the tank 14, that is to say the pressure P 1 is less than the pressure P 3 , air is sucked in via the connection 40, the filter device 32, the connection 30 and the connecting line 12 and transferred to the tank 14. Any filter material from the activated carbon 36 that flows along here is unproblematic since the tank 14 is closed in a pressure-tight manner.

Soll eine Reinigung der Filtereinrichtung 32 erfolgen, öffnet das Tankentlüftungsventil 26 entsprechend dem Tastverhältnis des Ansteuersignals 28. Dadurch liegt der Druck P2 am Tank 14 und an der Filtereinrichtung 32 an. Da im Saugrohr 20 ein Unterdruck herrscht, ist der Druck P2 geringer als der Druck P1 und der Druck P3. Durch dieses Druckgefälle werden die Kraftstoffdämpfe aus dem Tank 14 und die in der Aktivkohle 36 gespeicherten Kraftstoffdämpfe über das geöffnete Tankentlüftungsventil 26 angesaugt und der Verbrennungsluft der Verbrennungskraftmaschine 18 zugeführt. Diese verbrennen somit während des Verbrennungsprozesses.If the filter device 32 is to be cleaned, the tank ventilation valve 26 opens in accordance with the pulse duty factor of the control signal 28. As a result, the pressure P 2 is present at the tank 14 and at the filter device 32. Since there is a negative pressure in the intake manifold 20, the pressure P 2 is lower than the pressure P 1 and the pressure P 3 . Due to this pressure drop, the fuel vapors from the tank 14 and the fuel vapors stored in the activated carbon 36 are sucked in via the opened tank ventilation valve 26 and fed to the combustion air of the internal combustion engine 18. They therefore burn during the combustion process.

Um eine sichere Entlüftung des Tanks 14 und Reinigung der Filtereinrichtung 32 zu gewährleisten, muß die Funktion des Tankentlüftungsventils 26 überprüft werden. Mögliche Fehler des Tankentlüftungsventils 26 könnten beispielsweise ein klemmendes Ventilglied sein, so daß das Tankentlüftungsventil 26 entweder nicht mehr öffnet oder nicht mehr schließt. Ferner könnten Verschmutzungen in der Verbindungsleitung 12 abgelagert sein, die zu Querschnittsverengungen führen und somit die Funktion beeinträchtigen. Darüber hinaus ist bekannt, die Verbindungsleitung 12 als flexible Leitung (Schlauch) auszubilden, so daß eventuelle Abknickungen oder dergleichen ebenfalls zu Querschnittsverengungen führen könnten.To ensure reliable ventilation of the tank 14 and cleaning of the filter device 32 ensure the function of the tank ventilation valve 26 must be checked. Possible faults in the tank ventilation valve 26 could, for example, cause a jam Be valve member so that the tank vent valve 26 either no longer opens or no longer closes. Contamination in the connecting line 12 could also occur be deposited, which lead to narrowing of the cross-section and thus the function affect. In addition, the connecting line 12 is known to be flexible Form line (hose) so that any kinks or the like could also lead to cross-sectional narrowing.

Anhand von Figur 2 wird das erfindungsgemäße Verfahren zum Prüfen des Tankentlüftungssystems 10 erläutert. Bei einem Start 50 des Kraftfahrzeugs, beispielsweise durch Betätigen der Zündung, wird das Prüfungsverfahren initialisiert (Feld 52). Anschließend wird über eine Abfrage 54 geprüft, ob Freigabebedingungen 56 für das Prüfverfahren gegeben sind. Diese Freigabebedingungen 56 beinhalten beispielsweise parallel ablaufende Steuerungsvorgänge oder parallel ablaufende Diagnoseverfahren anderer Einrichtungen des Kraftfahrzeugs, die durch das Prüfungsverfahren 48 beeinflußt werden könnten. Die Freigabeprüfung 56 beinhaltet beispielsweise die Abfrage 58 über den momentanen Saugdruck P2 entsprechend dem Meßergebnis 44. Beispielsweise werden Differenzen zwischen einem maximalen und einem minimalen Saugdruck ausgewertet. Ist diese Differenz oberhalb einer vorgebbaren Differenz, ist der Saugrohrdruck P2 nicht stabil, so daß über das Signal 60 die Freigabe 56 für das Verfahren nicht erteilt wird. Ist die Differenz jedoch innerhalb eines vorgebbaren Bereiches, kann das eigentliche Prüfverfahren, die Kreuzkorrelation 62, erfolgen. Hierbei wird ein Stimulationssignal 64 zugeführt, das dem Tastverhältnis des Ansteuersignals 28 entspricht. Hierbei kann beispielsweise ein Stimulationssignal +1 für angesteuertes Tankentlüftungsventil 26 und von -1 für nicht angesteuertes Tankentlüftungsventil 26 geliefert werden. Nach Durchführung der Kreuzkorrelation wird mittels eines Signals 66 eine Wiederholungsprüfung 68 ausgelöst. Hierbei wird die Anzahl der durchgeführten Meßzyklen mit einer vorgebbaren Anzahl verglichen. Ist die Anzahl der durchgeführten Meßzyklen kleiner als die vorgegebene Zahl, wird über das Signal 70 die Wiederholungsprüfung ausgelöst. Ist die Anzahl der durchgeführten Meßzyklen gleich der vorgegebenen Anzahl, wird über das Signal 72 die Diagnose 74 durchgeführt. Bei der Diagnose 74 wird ein Korrelationskoeffizient der durchgeführten Korrelationsrechnung 62 überprüft. Weist dieser Korrelationskoeffizient einen Wert von 1 auf, sind das Ansteuersignal 28 und die Meßgröße 44 (Saugrohrdruck) im Sinne der Korrelationsrechnung identisch. Weist der Korrelationseffizient hingegen einen Wert von 0 auf, besteht kein Zusammenhang zwischen dem Abtastsignal 28 und der Meßgröße 44, so daß auf einen Fehler 76 erkannt wird. Bei Erkennen des Fehlers 76 kann beispielsweise einem Fahrzeugführer durch ein optisches Signal eine Information gegeben werden, daß das Tankentlüftungssystem 10 fehlerhaft ist.The method according to the invention for testing the tank ventilation system 10 is explained with reference to FIG. 2. At a start 50 of the motor vehicle, for example by actuating the ignition, the test procedure is initialized (field 52). A query 54 is then used to check whether there are release conditions 56 for the test method. These release conditions 56 include, for example, control processes which run in parallel or diagnostic processes of other devices of the motor vehicle which run in parallel and which could be influenced by the test method 48. The release check 56 includes, for example, the query 58 about the current suction pressure P 2 in accordance with the measurement result 44. For example, differences between a maximum and a minimum suction pressure are evaluated. If this difference is above a predeterminable difference, the intake manifold pressure P 2 is not stable, so that the signal 56 does not give the release 56 for the method. However, if the difference is within a predeterminable range, the actual test method, the cross-correlation 62, can take place. In this case, a stimulation signal 64 is supplied, which corresponds to the pulse duty factor of the control signal 28. In this case, for example, a stimulation signal +1 for activated tank ventilation valve 26 and -1 for uncontrolled tank ventilation valve 26 can be delivered. After the cross-correlation has been carried out, a repeat test 68 is triggered by means of a signal 66. The number of measurement cycles carried out is compared with a predeterminable number. If the number of measurement cycles carried out is less than the predetermined number, the repeat test is triggered via signal 70. If the number of measurement cycles carried out is equal to the predetermined number, the diagnosis 74 is carried out via the signal 72. In diagnosis 74, a correlation coefficient of the correlation calculation 62 is checked. If this correlation coefficient has a value of 1, the control signal 28 and the measured variable 44 (intake manifold pressure) are identical in the sense of the correlation calculation. If, on the other hand, the correlation coefficient has a value of 0, there is no relationship between the scanning signal 28 and the measured variable 44, so that an error 76 is recognized. When error 76 is detected, a vehicle driver can be informed, for example by an optical signal, that the tank ventilation system 10 is defective.

Ein Abbruch 78 des Verfahrens findet beispielsweise statt, wenn über die Prüfung der Freigabebedingung 56 ein Signal 80 generiert wird, das das Nichtvorhandensein der definierten Freigabebedingungen beinhaltet. Ferner kann während der Stimulation des Ansteuersignals 28 beziehungsweise während der Erfassung der Meßgröße 44 ein Signal 82 generiert werden, das ebenfalls zum Abbruch 78 führt. Das Signal 82 kann beispielsweise ein Fehlersignal sein, bei fehlender oder unplausibler Meßgröße 44, Ablauf einer vorgesehenen Gesamtstandzeit des Tankentlüftungsventils 26 und/oder bei Erreichen der vorgegebenen Anzahl der durchzuführenden Meßzyklen während der Wiederholungsprüfung 68. Nach Abbruch des Prüfverfahrens 48 kann beispielsweise ein Timer gestartet werden, der das Prüfverfahren 48 durch Neuinitialisierung 52 wieder startet. Gegebenenfalls kann vorgesehen sein, daß das Prüfverfahren 48 mit jedem Neustart der Brennkraft der Verbrennungskraftmaschine 18 abläuft.A termination 78 of the method takes place, for example, if the test of the Release condition 56, a signal 80 is generated which indicates the absence of the defined release conditions. Furthermore, during the stimulation of the Control signal 28 or during the acquisition of the measured variable 44 Signal 82 are generated, which also leads to termination 78. The signal 82 can be, for example, an error signal if the measured variable 44 is missing or implausible, Expiration of an intended total service life of the tank ventilation valve 26 and / or at Reaching the specified number of measuring cycles to be carried out during the Repeat test 68. After terminating test method 48, for example, a Timers are started, the test method 48 through reinitialization 52 again starts. If necessary, it can be provided that the test method 48 with each Restart of the internal combustion engine 18 expires.

Nach einem weiteren Ausführungsbeispiel kann anstelle des Saugrohrdrucks P2 als Meßgröße 44 auch eine andere Meßgröße, beispielsweise die Stellung der Drosselklappe 24, für die Kreuzkorrelation herangezogen werden. Hierbei ist ein Signal, beispielsweise über ein Potentiometer, abgreifbar, das der Stellung der Drosselklappe 24 entspricht. According to a further exemplary embodiment, instead of the intake manifold pressure P 2, another measured variable, for example the position of the throttle valve 24, can also be used for the cross-correlation as the measured variable 44. Here, a signal can be tapped, for example via a potentiometer, which corresponds to the position of the throttle valve 24.

Die Kreuzkorrelation kann passiv oder aktiv durchgeführt werden. Bei der passiven Kreuzkorrelation werden die auszuwertenden Signale, hier das Ansteuersignal 28 und die Meßgröße 44, unbeeinflußt verarbeitet. Bei der aktiven Kreuzkorrelation werden die in die Kreuzkorrelation eingehenden Ansteuersignale 28 und Meßgröße 44 mit Stimulationssignalen angeregt, so daß eine Empfindlichkeit des Prüfverfahrens 48 gesteigert werden kann.The cross correlation can be carried out passively or actively. With the passive Cross-correlation becomes the signals to be evaluated, here the control signal 28 and the measured variable 44, processed uninfluenced. With active cross correlation, the control signals 28 and measured variable 44 entering the cross-correlation Stimulation signals excited so that a sensitivity of the test method 48th can be increased.

Claims (7)

Verfahren zum Prüfen eines Tankentlüftungssystems, insbesondere eines Kraftfahrzeuges, bei dem aus einem Tank entweichende kohlenwasserstoffhaltige flüchtige Gase über eine Filtereinrichtung geführt und in dieser gesammelt werden, und durch eine Beaufschlagung der Filtereinrichtung mit einem Unterdruck das Filtergut über eine Sauganlage einem Verbrennungsprozeß in einer Verbrennungskraftmaschine des Kraftfahrzeuges zugeführt wird, wobei eine Verbindung zwischen der Filtereinrichtung und der Sauganlage durch ein getaktet ansteuerbares Schaltmittel geöffnet beziehungsweise geschlossen wird, dadurch gekennzeichnet, daß ein Ansteuersignal für das Schaltmittel mit einer, einen Zustand der Sauganlage definierenden Meßgröße kreuzkorreliert wird und ein Korrelationskoeffizient als Diagnosesignal des Tankentlüftungssystems ausgewertet wird.Method for testing a tank ventilation system, in particular a motor vehicle, in which volatile gases containing hydrocarbons escaping from a tank are passed through a filter device and collected therein, and by subjecting the filter device to a negative pressure, the filter material via a suction system to a combustion process in an internal combustion engine of the motor vehicle is supplied, a connection between the filter device and the suction system being opened or closed by a cyclically controllable switching means, characterized in that a control signal for the switching means is cross-correlated with a measured variable defining a state of the suction system and a correlation coefficient is evaluated as a diagnostic signal of the tank ventilation system becomes. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Meßgröße ein Saugrohrdruck verwendet wird.Method according to Claim 1, characterized in that an intake manifold pressure is used as the measured variable. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Meßgröße eine Stellung einer Drosselklappe der Sauganlage ausgewertet wird.Method according to claim 1, characterized in that a position of a throttle valve of the intake system is evaluated as the measured variable. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Kreuzkorrelation in einer vorgebbaren Anzahl von Meßzyklen wiederholt wird.Method according to one of the preceding claims, characterized in that the cross-correlation is repeated in a predeterminable number of measuring cycles. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Prüfung des Tankentlüftungssystems in vorgebbaren Zeitintervallen wiederholt wird.Method according to one of the preceding claims, characterized in that the test of the tank ventilation system is repeated at predefinable time intervals. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Prüfung des Tankentlüftungssystems bei jedem Neustart der Verbrennungskraftmaschine wiederholt wird. Method according to one of the preceding claims, characterized in that the test of the tank ventilation system is repeated each time the internal combustion engine is restarted. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß vor Durchführung der Kreuzkorrelation Freigabebedingungen für das Prüfverfahren überprüft werden.Method according to one of the preceding claims, characterized in that release conditions for the test method are checked before the cross-correlation is carried out.
EP99123162A 1998-12-23 1999-11-22 Method for testing a tank purge system Expired - Lifetime EP1013917B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19860750 1998-12-23
DE19860750 1998-12-23
DE19908138 1999-02-25
DE19908138A DE19908138B4 (en) 1998-12-23 1999-02-25 Method for testing a tank ventilation system

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EP1013917A2 true EP1013917A2 (en) 2000-06-28
EP1013917A3 EP1013917A3 (en) 2000-11-22
EP1013917B1 EP1013917B1 (en) 2004-02-18

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AT (1) ATE259935T1 (en)
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EP1179671A2 (en) 2000-08-07 2002-02-13 Volkswagen Aktiengesellschaft Method for checking a fuel injection system
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ITBO20120538A1 (en) * 2012-10-02 2014-04-03 Magneti Marelli Spa FUNCTIONAL DIAGNOSIS OF A CANISTER SOLENOID VALVE IN AN INTEGRATED CIRCUIT FOR AN INTERNAL COMBUSTION ENGINE
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US5140961A (en) * 1990-01-12 1992-08-25 Nissan Motor Co., Ltd. System and method for self diagnosing an engine control system
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EP1179671A2 (en) 2000-08-07 2002-02-13 Volkswagen Aktiengesellschaft Method for checking a fuel injection system
EP1179671A3 (en) * 2000-08-07 2005-06-01 Volkswagen Aktiengesellschaft Method for checking a fuel injection system
WO2003033901A1 (en) * 2001-10-11 2003-04-24 Robert Bosch Gmbh Method for monitoring proper operation of an air evacuating valve of a tank air evacuation system
US7047798B2 (en) 2001-10-11 2006-05-23 Robert Bosch Gmbh Method for checking the operativeness of a tank-ventilation valve of a tank-ventilation system
ITBO20120538A1 (en) * 2012-10-02 2014-04-03 Magneti Marelli Spa FUNCTIONAL DIAGNOSIS OF A CANISTER SOLENOID VALVE IN AN INTEGRATED CIRCUIT FOR AN INTERNAL COMBUSTION ENGINE
WO2016066937A1 (en) * 2014-10-31 2016-05-06 Renault S.A.S. Method for diagnosing the operation of the purging of a canister
FR3027956A1 (en) * 2014-10-31 2016-05-06 Renault Sa METHOD FOR DIAGNOSING THE OPERATION OF THE PURGE OF A CANISTER
KR20170077152A (en) * 2014-10-31 2017-07-05 르노 에스.아.에스. Method for diagnosing the operation of the purging of a canister
US10202944B2 (en) 2014-10-31 2019-02-12 Renault S.A.S. Method for diagnosing the operation of the purging of a canister
RU2695244C2 (en) * 2014-10-31 2019-07-22 Рено С.А.С. Method of diagnosing operation of the valve of purge fuel vapour filter

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EP1013917A3 (en) 2000-11-22
EP1013917B1 (en) 2004-02-18
ATE259935T1 (en) 2004-03-15
ES2214799T3 (en) 2004-09-16

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