EP0864741B1 - Device for flushing a charcoal canister and for leak testing of a vehicule engine fuel tank installation connected to said canister - Google Patents
Device for flushing a charcoal canister and for leak testing of a vehicule engine fuel tank installation connected to said canister Download PDFInfo
- Publication number
- EP0864741B1 EP0864741B1 EP97118908A EP97118908A EP0864741B1 EP 0864741 B1 EP0864741 B1 EP 0864741B1 EP 97118908 A EP97118908 A EP 97118908A EP 97118908 A EP97118908 A EP 97118908A EP 0864741 B1 EP0864741 B1 EP 0864741B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air pump
- activated carbon
- fuel tank
- tank system
- open
- 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.)
- Expired - Lifetime
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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
- F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space
Definitions
- the invention relates to a device for flushing an activated carbon trap and Temporary leak test of a fuel tank system connected to this one Vehicle internal combustion engine according to the preamble of patent claim 1.
- a device for flushing an activated carbon trap is already known from EP 0 585 527 B1 known. This consists of a line connected to the activated carbon trap, which in the Air intake system of the internal combustion engine opens downstream of the throttle device. Because of the vacuum fluctuations depending on the load there is an irregular one Flushing, which is compensated by a clocked solenoid valve should. This requires a considerable amount of equipment and control technology.
- An internal combustion engine controller is known from EP 0 750 108 A2, in which one Activated carbon trap to be regenerated via a controllable purge valve. Additionally for the diagnosis the functionality of the flushing system should be connected to a line leading to the atmosphere Activated charcoal trap a pressure generating means can be arranged with which the pressure in the flushing system can be increased.
- the object of the invention is a device according to the preamble of claim 1, in which one of the fluctuating intake pressure of the internal combustion engine independent flushing of the activated carbon trap is achieved, while an advantageous one Leakage test for the tank system is to be achieved without functional restrictions consist.
- the drawing shows a device 1 according to the invention for flushing an activated carbon trap 2 and for the temporary leak test of a fuel tank system 3 connected to it Vehicle internal combustion engine 4, in which the purge air from the atmosphere via the activated carbon trap 2 is introduced into an air intake system 5 with a throttle device 6 of the internal combustion engine 4 and the leak test by setting a test pressure in the hermetically sealed Tank system 3 and subsequent pressure drop measurement by a pressure sensor 7 is recorded, takes place over a period of time that provides information about the tightness.
- This air pump 8 is e.g. B. designed as a side channel pump, the direction of delivery is switchable.
- the fuel tank 9 via a first Ventilation line 10 with the activated carbon trap 2 and through this with the atmosphere a terminal 11 is connected when the engine is turned off that the Activated carbon trap 2 via a purge line 12 with the electric air pump 8 and over this is connected to the air intake system 5 when the internal combustion engine is running, that in the purge line 12 between activated carbon trap 2 and air pump 8 in the direction Activated carbon trap 2 includes suction valve 13 and in the ventilation line 10 Electric open-close valve 14 are arranged that the ventilation line 10 upstream of the on-off valve 14 and the flushing line 12 downstream of the suction valve 13 by a Connection line 15, which bypasses the activated carbon trap 2, in which an in Direction of the tank system 3 opening pressure valve 16 is arranged that at switched delivery direction of the air pump 8 and closed switched on-off valve 14 and running internal combustion engine test air from the air intake system 5 the opening pressure valve 16 is conveyed directly into the tank system, that the suction valve 13 is closed by the pressure generated by the air pump that when
- the predetermined period of time or Pressure drop (gradient) for the leak test depending on the Fuel quantity is variable, the fuel quantity as a potentiometer value a tank level indicator (not shown) can be detected and evaluated.
- the activated carbon trap is only rinsed at a high level Load delivery of the internal combustion engine or low air intake system vacuum, in which represents a small disturbance variable in relation to the exhaust gas values, wherein moreover, the rinsing only over a predetermined, recurring period of time can be done.
- the determination of tight or leaky tank system 3 can then be used as a diagnostic value in the control unit 19 are stored, acoustically or visually displayed. The latter is then done on a display.
- a flushing of the activated carbon trap independent of the fluctuating negative pressure in the air intake system can be achieved and, moreover, a leak test that is independent of the fuel temperature in the tank system.
- the device can be operated with little expenditure on equipment and control technology.
Description
Die Erfindung betrifft eine Vorrichtung zum Spülen einer Aktivkohlefalle und zur zeitweiligen Dichtheitsprüfung einer mit dieser verbundenen Brennstofftankanlage einer Fahrzeug-Brennkraftmaschine nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for flushing an activated carbon trap and Temporary leak test of a fuel tank system connected to this one Vehicle internal combustion engine according to the preamble of patent claim 1.
Eine Vorrichtung zum Spülen einer Aktivkohlefalle ist bereits aus der EP 0 585 527 B1 bekannt. Diese besteht aus einer mit der Aktivkohlefalle verbundenen Leitung, die in das Luftansaugsystem der Brennkraftmaschine stromab der Drosseleinrichtung einmündet. Wegen der dort lastabhängig schwankenden Unterdrücke erfolgt eine unregelmäßige Spülung, die durch ein getaktet angesteuertes Elektromagnetventil kompensiert werden soll. Hierfür ist ein erheblicher geräte- und steuertechnischer Aufwand zu betreiben.A device for flushing an activated carbon trap is already known from EP 0 585 527 B1 known. This consists of a line connected to the activated carbon trap, which in the Air intake system of the internal combustion engine opens downstream of the throttle device. Because of the vacuum fluctuations depending on the load there is an irregular one Flushing, which is compensated by a clocked solenoid valve should. This requires a considerable amount of equipment and control technology.
In den USA sind in einigen Staaten eine automatische Überwachung aller abgasrelevanten Komponenten eines Kraftfahrzeugmotors eingeführt (OBDII). Alle Funktionen und Komponenten einer Motorsteuerung müssen regelmäßig auf ihre Wirkung und auf die Effektivität ihrer Wirkung überprüft werden. Neben der Überprüfung des Zündsystems auf Zündaussetzer oder des Katalysators ist auch eine Dichtheitsprüfung des Tanksystems gefordert. Mit dieser Forderung soll ein Ausgasen beim Abstellen des Fahrzeugs in praller Sonne durch undichte Schlauchverbindungen oder poröse Schläuche verhindert werden. Die kalifornische Umweltbehörde fordert daher, daß während jedes Fahrzeugtrips das gesamte Tanksystem auf Dichtheit überprüft wird. Als Erkennungsschwelle in ein 1mm großes Loch definiert.In the United States, in some states, everyone is automatically monitored Exhaust-relevant components of a motor vehicle engine introduced (OBDII). All Functions and components of an engine control system have to be checked regularly Effect and be checked for the effectiveness of their effect. In addition to the review of the ignition system on misfiring or the catalyst is also one Leak test of the tank system required. Outgassing is intended with this requirement when parking the vehicle in blazing sun due to leaky hose connections or porous hoses can be prevented. The California Environment Agency is calling therefore that the entire tank system for leaks during each trip is checked. Defined as a detection threshold in a 1mm hole.
Aus der DE 43 28 090 C2 ist hierfür ein gängiges Verfahren bekannt, den Tank mit Hilfe des Saugrohrunterdruckes über ein Tankentlüftungsventil (Regenerierventil) zu evakuieren und mit einem Drucksensor im Tank den Wiederanstieg des Druckes zu messen. Schwierigkeiten bei diesem Verfahren gibt es einmal durch die unterschiedlichen Tankfüllstände, die im Auswertealgorithmus berücksichtigt werden müssen, und zum anderen hat die Dichtigkeitsprüfung mit dem Saugrohrunterdruck den weiteren Nachteil, daß zur Evakuierung des Tankes Brennstoffdämpfe über das Tankentlüftungsventil in den Ansaugtrakt gezogen werden müssen. Während der Fahrt heizt der Brennstoff im Tank wegen der Einspritzventilkühlung auf und neigt zum Ausgasen (Druckanstieg). Daher sollte die Dichtheitsprüfung während der ersten Warmlaufphase des Motors stattfinden, um eine Verschlechterung der Abgaswerte bei aufgeheiztem Brennstoff zu verhindern. Der Einsatz dieses Verfahrens eignet sich damit nicht für eine Prüfung bei warmem Motor.From DE 43 28 090 C2, a common method for this is known, including the tank With the help of the intake manifold vacuum via a tank ventilation valve (regeneration valve) evacuate and use a pressure sensor in the tank to increase the pressure again measure up. There are difficulties with this procedure due to the different tank levels, which are taken into account in the evaluation algorithm and, on the other hand, the leak test with the intake manifold vacuum has the Another disadvantage that the fuel vapors to evacuate the tank Tank ventilation valve must be pulled into the intake tract. The heater heats up while driving Fuel in the tank due to the injection valve cooling and tends to outgas (pressure increase). Therefore, the leak test should take place during the first warm-up phase of the engine to prevent a deterioration of the exhaust gas values when the fuel is heated. The use of this The procedure is therefore not suitable for a test with a warm engine.
Aus der PCT-WO96/14505 ist bereits ein Vorschlag bekannt, bei dem eine Membranpumpe, die vom Saugrohrunterdruck angetrieben wird, Überdruck im Tanksystem erzeugt, dessen Abklingen nach dem Abstellen der Membranpumpe als Maß für Undichtheit gewertet wird. Diese Druckschrift offenbart jedoch die Maßnahme, die Spülluft ebenfalls in die Unterdruckzone des Luftansaugsystems zu saugen, womit der erwähnte Nachteil besteht, daß ein erheblicher geräte- und steuertechnischer Aufwand zu betreiben ist.A proposal is already known from PCT-WO96 / 14505, in which a diaphragm pump, which Suction pipe vacuum is driven, excess pressure is generated in the tank system, its decay after the shutdown of the diaphragm pump is considered a measure of leakage. This publication However, the measure discloses the purge air also in the vacuum zone of the air intake system to suck, which has the disadvantage mentioned that a considerable device and control technology Effort is to be paid.
Aus der EP 0 750 108 A2 ist ein Brennkraftmaschinencontroller bekannt, bei dem eine Aktivkohlefalle über ein ansteuerbares Spülventil regeneriert werden soll. Zusätzlich für die Diagnose der Funktionstüchtigkeit des Spülsystems soll an einer in die Atmosphäre führenden Leitung der Aktivkohlefalle ein druckerzeugendes Mittel angeordnet sein, mit dem der Druck im Spülsystem erhöht werden kann.An internal combustion engine controller is known from EP 0 750 108 A2, in which one Activated carbon trap to be regenerated via a controllable purge valve. Additionally for the diagnosis the functionality of the flushing system should be connected to a line leading to the atmosphere Activated charcoal trap a pressure generating means can be arranged with which the pressure in the flushing system can be increased.
Da es sich bei diesem Mittel nur um eine Luftpumpe handeln kann, besteht der Nachteil, daß der freie Durchgang durch die in die Atmospäre führende Leitung behindert ist, d. h. bei laufender Brennkraftmaschine ist der Durchgang für die Spülluft und bei abgestellter Brennkraftmaschine für die aus der Tankanlage brennstoffbeladene, jedoch in der Aktivkohlefall Brennstoff entladene Entlüftungsluft behindert, wodurch Funktionseinschränkungen verursacht sind.Since this means can only be an air pump, there is the disadvantage that the free Passage through the line leading into the atmosphere is obstructed, d. H. while running Internal combustion engine is the passage for the purge air and for when the internal combustion engine is switched off the fuel-laden from the tank system, but unloaded in the activated carbon case Ventilation air obstructed, which causes functional restrictions.
Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung nach dem Oberbegriff des Patentanspruchs 1 auszubilden, bei der eine vom schwankenden Ansaugdruck der Brennkraftmaschine unabhängige Spülung der Aktivkohlefalle erreicht wird, wobei gleichzeitig eine vorteilhafte Dichtheitsprüfung für das Tanksystem erreicht werden soll, ohne daß Funktionseinschränkungen bestehen. Proceeding from this, the object of the invention is a device according to the preamble of claim 1, in which one of the fluctuating intake pressure of the internal combustion engine independent flushing of the activated carbon trap is achieved, while an advantageous one Leakage test for the tank system is to be achieved without functional restrictions consist.
Diese Aufgabe ist durch die im Anspruch 1 angegebenen Merkmale gelöst worden. Vorteilhafte Weiterbildungen der Vorrichtung nach Anspruch 1 sind in den Unteransprüchen angegeben.This object has been achieved by the features specified in claim 1. Advantageous developments of the device according to claim 1 are in the subclaims specified.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben.An embodiment of the invention is shown in the drawing and is below described.
Die Zeichnung zeigt eine erfindungsgemäße Vorrichtung 1 zum Spülen einer Aktivkohlefalle 2 und
zur zeitweiligen Dichtheitsprüfung einer mit dieser verbundenen Brennstofftankanlage 3 einer
Fahrzeug-Brennkraftmaschine 4, bei der die Spülluft aus der Atmosphäre über die Aktivkohlefalle 2
in ein Luftansaugsystem 5 mit einer Drosseleinrichtung 6 der Brennkraftmaschine 4 eingeleitet wird
und die Dichtheitsprüfung durch Einstellen eines Prüfdrucks in der hermetisch abgeschlossenen
Tankanlage 3 und anschließender Druckabfallmessung, die von einem Drucksensor 7
erfaßt wird, über eine Zeitspanne erfolgt, die Auskunft über die Dichtheit gibt.The drawing shows a device 1 according to the invention for flushing an activated carbon trap 2 and
for the temporary leak test of a fuel tank system 3 connected to it
Vehicle internal combustion engine 4, in which the purge air from the atmosphere via the activated carbon trap 2
is introduced into an air intake system 5 with a
Es ist nun vorgesehen, daß die Spülluft stromauf der Drosseleinrichtung 6 in das
Luftansaugsystem 5 eingeleitet und von einer elektrischen Luftpumpe 8 gefördert wird,
deren Förderrichtung bei der Dichtheitsprüfung umgekehrt wird. Diese Luftpumpe 8 ist
z. B. als Seitenkanalpumpe ausgeführt, deren Förderrichtung umschaltbar ist.It is now provided that the purge air upstream of the
Darüber hinaus ist vorgesehen, daß der Brennstofftank 9 über eine erste
Belüftungsleitung 10 mit der Aktivkohlefalle 2 und über diese mit der Atmosphäre über
einen Anschluß 11 verbunden ist, wenn die Brennkraftmaschine abgestellt ist, daß die
Aktivkohlefalle 2 über eine Spülleitung 12 mit der elektrischen Luftpumpe 8 und über
diese mit dem Luftansaugsystem 5 verbunden ist, wenn die Brennkraftmaschine läuft,
daß in der Spülleitung 12 zwischen Aktivkohlefalle 2 und Luftpumpe 8 ein in Richtung
Aktivkohlefalle 2 schließendes Saugventil 13 und in der Belüftungsleitung 10 ein
elektrisches Auf-Zu-Ventil 14 angeordnet sind, daß die Belüftungsleitung 10 stromauf
des Auf-Zu-Ventils 14 und die Spülleitung 12 stromab des Saugventils 13 durch eine
Verbindungsleitung 15, die die Aktivkohlefalle 2 umgeht, verbunden sind, in der ein in
Richtung der Tankanlage 3 öffnendes Druckventil 16 angeordnet ist, daß bei
umgeschalteter Förderrichtung der Luftpumpe 8 und geschlossen geschaltetem Auf-Zu-Ventil
14 und laufender Brennkraftmaschine Prüfluft aus dem Luftansaugsystem 5 über
das öffnende Druckventil 16 direkt in die Tankanlage gefördert wird, daß das Saugventil
13 durch den von der Luftpumpe erzeugten Druck geschlossen wird, daß bei Erreichen
einer vorbestimmten Druckdifferenz zum Atmosphärendruck die Luftpumpe 8
abgeschaltet wird und der über eine vorbestimmte Zeitspanne erfolgende Druckabfall
(Gradient) erfaßt und ausgewertet wird zur Feststellung, ob die Tankanlage 3 dicht oder
undicht ist.In addition, it is provided that the
Vorteilhafterweise ist vorgesehen, daß die vorbestimmte Zeitspanne oder der Druckabfall (Gradient) für die Dichtheitsprüfung in Abhängigkeit von der Brennstoffüllmenge variabel ist, wobei die Brennstoffüllmenge als Potentiometerwert einer Tankfüllstandsanzeige (nicht dargestellt) erfaßt und ausgewertet werden kann. It is advantageously provided that the predetermined period of time or Pressure drop (gradient) for the leak test depending on the Fuel quantity is variable, the fuel quantity as a potentiometer value a tank level indicator (not shown) can be detected and evaluated.
Es ist vorgesehen, daß die Vorrichtung eine Schaltungsanordnung 17 aufweist, die in Abhängigkeit eines Steuerprogramms 18 eines elektronischen Steuergeräts 19
- die
Luftpumpe 8 abschaltet und das Auf-Zu-Ventil 14 auf Geöffnet schaltet, wenn die Brennkraftmaschine abgestellt wird, - die
Luftpumpe 8 auf Absaugen und das Auf-Zu-Ventil 14 auf Geöffnet schaltet, wenn die Brennkraftmaschine läuft, - die
Luftpumpe 8 auf in die Tankanlage 3 Fördern schaltet und das Auf-Zu-Ventil 14 auf Geschlossen schaltet, wenn die Brennkraftmaschine läuft und eine Dichtheitsprüfung beginnt, - die
Luftpumpe 8 abschaltet bei Erreichen der vorbestimmten Druckdifferenz nach Feststellung, ob die Tankanlage 3 dicht oder undicht ist, und anschließend - die
Luftpumpe 8 wieder auf Absaugen und das Auf-Zu-Ventil 14 auf Geöffnet schaltet.
- the
air pump 8 switches off and the on-offvalve 14 switches to open when the internal combustion engine is switched off, - the
air pump 8 switches to suction and the on-offvalve 14 switches to open when the internal combustion engine is running, - the
air pump 8 switches to conveying into the tank system 3 and the open-close valve 14 switches to closed when the internal combustion engine is running and a leak test begins, - the
air pump 8 switches off when the predetermined pressure difference is reached after determining whether the tank system 3 is tight or leaking, and then - the
air pump 8 switches back to suction and the on-offvalve 14 switches to open.
Durch das geöffnete Auf-Zu-Ventil 14 erfolgt ein Druckabbau in der Tankanlage 3. In
der Phase Absaugen erfolgt über das geöffnete Auf-Zu-Ventil 14 gleichzeitig ein
Absaugen von Brennstoffdämpfen aus der an sich zur Atmosphäre hin geschlossenen
Tankanlage 3. Vorteilhafterweise erfolgt das Spülen der Aktivkohlefalle nur bei hoher
Lastabgabe der Brennkraftmaschine bzw. geringem Luftansaugsystem-Unterdruck, in
der das Spülgas in bezug auf die Abgaswerte eine geringe Störgröße darstellt, wobei
darüber hinaus das Spülen nur über eine vorgegebene, wiederkehrende Zeitspanne
erfolgen kann.Pressure is reduced in the tank system 3 by the open on-off
Die Festlegung dichte oder undichte Tankanlage 3 kann danach als Diagnosewert in
dem Steuergerät 19 gespeichert werden, akustisch oder visuell angezeigt werden.
Letzteres erfolgt dann über ein Display.The determination of tight or leaky tank system 3 can then be used as a diagnostic value in
the
Mit der erfindunsgemäßen Vorrichtung läßt sich eine vom schwankenden Unterdruck im
Luftansaugsystem unabhängige Spülung der Aktivkohlefalle erreichen und darüber
hinaus eine von der Brennstofftemperatur im Tanksystem unabhängige
Dichtheitsprüfung.
Die Vorrichtung ist mit geringem geräte- und steuertechnischen Aufwand zu betreiben.With the device according to the invention, a flushing of the activated carbon trap independent of the fluctuating negative pressure in the air intake system can be achieved and, moreover, a leak test that is independent of the fuel temperature in the tank system.
The device can be operated with little expenditure on equipment and control technology.
Claims (8)
- Device for purging an activated carbon trap (2) and for intermittently leak testing a fuel tank system (3), which is connected to the activated carbon trap (2), of a vehicle i.c. engine (4), wherein the device has the following features:an activated carbon trap (2);an air intake system (5) connected to the i.c. engine and having a throttle device (6);a fuel tank system (3), which comprises a fuel tank (9) and a ventilating line (10), by which the fuel tank (9) is connected to the activated carbon trap (2);a purging line, by which the atmosphere is connected via the activated carbon trap (2) to the air intake system (5) upstream of the throttle device (6);an air pump (8) arranged in such a way that purging air from the atmosphere may be introduced via the activated carbon trap (2) and the air pump (8) into the air intake system (5) upstream of the throttle device (6);means of hermetically sealing the fuel tank system (3);a pressure sensor (7) so arranged that it may detect the pressure in the hermetically sealed fuel tank system (3);a device for leak testing the fuel tank system (3), comprising the following means whereby:a test pressure may be adjusted in the hermetically sealed fuel tank system (3);a subsequent pressure drop measurement, which may be detected by the pressure sensor (7) and is pursued over a period of time, may be effected,the pressure drop measurement provides information about the sealing, characterized in that the air pump (8) is an electric air pump, which is disposed in the purging line (12) between air intake system (5) and activated carbon trap (2), and a circuit arrangement is provided which, during leak testing, reverses the feed direction of the air pump (8) so that test air is fed out of the air intake system (5) into the fuel tank system (3).
- Device according to claim 1, characterized in that the fuel tank (9) of the tank system (3) is connected by a first ventilating line (10) to the activated carbon trap (2), that the atmosphere is connected by a connection (11) to the activated carbon trap (2) and the latter is connected by a purging line (12) to the electric air pump (8) and by the latter to the air intake system (5), that a suction valve (13) closing in the direction of the activated carbon trap (2) is disposed in the purging line (12) between activated carbon trap (2) and air pump (8) and an electric open/closed valve (14) is disposed in the ventilating line (10), that the ventilating line (10) is connected upstream of the open/closed valve (14) and the purging line (12) is connected downstream of the suction valve (13) by a connecting line (15), in which a pressure valve (16) opening in the direction of the tank system is disposed, that the suction valve (13) is so constructed that it is closed by the pressure generated by the air pump (8), wherein the device for leak testing is so constructed that, when the feed device [sic] of the air pump (8) is reversed and the open/closed valve (14) is switched to "closed", test air is fed from the air intake system (5) via the opening pressure valve (16) directly into the fuel tank system (3) and upon attainment of a predetermined pressure difference relative to the atmospheric pressure the air pump (8) is disconnected and the pressure drop (gradient) occurring over a predetermined period of time is acquired and evaluated in order to establish whether the fuel tank system (3) is leaking or not.
- Device according to claim 2, characterized in that the predetermined period of time or the pressure drop (gradient) for leak testing is variable in dependence upon the fuel filling quantity.
- Device according to claim 3, characterized in that the fuel filling quantity is acquired as a potentiometer value of a tank level indication and evaluated.
- Device according to one of the preceding claims, characterized in that the circuit arrangement (17) in dependence upon a control program (18) of an electronic controller (19)disconnects the air pump (8) and switches the open/closed valve (14) to "open" when the i.c. engine is stopped,switches the air pump (8) to "extract" and the open/closed valve (14) to "open" when the i.c. engine is running,switches the air pump (8) to "feed into tank system (3)" and the open/closed valve (14) to "closed" when the i.c. engine is running and a leak test is beginning,disconnects the air pump (8) upon attainment of the predetermined pressure difference after establishing whether the tank system (3) is leaking or not, and thenswitches the air pump (8) back to "extract" and the open/closed valve (14) to "open".
- Device according to one of the preceding claims, characterized in that the determination whether the tank system (3) is leaking or not is stored as a diagnostic value and/or acoustically or visually indicated.
- Device according to one of the preceding claims, characterized in that purging of the activated carbon trap (2) is effected only in the situation of a high load output of the i.c. engine and/or a low air intake system partial vacuum.
- Device according to one of the preceding claims, characterized in that purging is effected only over a preset, recurring period of time.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19709903 | 1997-03-11 | ||
| DE19709903A DE19709903A1 (en) | 1997-03-11 | 1997-03-11 | Device for flushing an activated carbon trap and for temporarily checking the tightness of a fuel tank system of a vehicle internal combustion engine connected to it |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0864741A2 EP0864741A2 (en) | 1998-09-16 |
| EP0864741A3 EP0864741A3 (en) | 1998-09-30 |
| EP0864741B1 true EP0864741B1 (en) | 2000-05-31 |
Family
ID=7822919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97118908A Expired - Lifetime EP0864741B1 (en) | 1997-03-11 | 1997-10-30 | Device for flushing a charcoal canister and for leak testing of a vehicule engine fuel tank installation connected to said canister |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5975062A (en) |
| EP (1) | EP0864741B1 (en) |
| DE (2) | DE19709903A1 (en) |
| ES (1) | ES2146445T3 (en) |
Families Citing this family (42)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19740582A1 (en) | 1997-09-16 | 1999-03-18 | Pierburg Ag | Electric air pump for active carbon trap rinsing device |
| DE19829585A1 (en) | 1998-07-02 | 2000-01-05 | Pierburg Ag | Device for flushing an activated carbon trap and for temporarily checking the tightness of a fuel tank system of a vehicle internal combustion engine connected to it |
| JP3516599B2 (en) * | 1998-11-16 | 2004-04-05 | 株式会社日立ユニシアオートモティブ | Leak diagnosis device for evaporative fuel treatment equipment |
| JP3558555B2 (en) * | 1999-06-30 | 2004-08-25 | 株式会社日立ユニシアオートモティブ | Leak diagnosis device for evaporative fuel treatment equipment |
| US6530265B2 (en) * | 1999-08-30 | 2003-03-11 | Daimlerchrysler Corporation | Small/gross leak check |
| US6536261B1 (en) * | 1999-09-09 | 2003-03-25 | Siemens Automotive Inc. | Vacuum leak verification system and method |
| US6363921B1 (en) * | 1999-09-09 | 2002-04-02 | Siemens Canada Limited | Vacuum leak verification system and method |
| JP3456467B2 (en) * | 1999-11-02 | 2003-10-14 | トヨタ自動車株式会社 | Failure diagnosis device for evaporation purge system |
| JP2001182629A (en) * | 1999-12-27 | 2001-07-06 | Fuji Heavy Ind Ltd | Diagnostic device and pressure sensor for evaporative purging system |
| DE10012778A1 (en) * | 2000-03-17 | 2001-09-27 | Bosch Gmbh Robert | Low emission fuel tank system operation, especially for motor vehicle, involves feeding gas/vapor out via active filter for overpressure or leak testing using vacuum |
| US6634343B2 (en) | 2000-12-01 | 2003-10-21 | Denso Corporation | Evaported fuel processor and fault diagnosing apparatus therefor |
| US6581580B2 (en) | 2001-01-24 | 2003-06-24 | Ford Global Technologies, Inc. | Hydrocarbon vapor evacuation system |
| JP2002256986A (en) | 2001-03-02 | 2002-09-11 | Denso Corp | Fuel vapor treating device |
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-
1997
- 1997-03-11 DE DE19709903A patent/DE19709903A1/en not_active Ceased
- 1997-10-30 DE DE59701806T patent/DE59701806D1/en not_active Expired - Fee Related
- 1997-10-30 EP EP97118908A patent/EP0864741B1/en not_active Expired - Lifetime
- 1997-10-30 ES ES97118908T patent/ES2146445T3/en not_active Expired - Lifetime
-
1998
- 1998-03-11 US US09/038,430 patent/US5975062A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0864741A3 (en) | 1998-09-30 |
| ES2146445T3 (en) | 2000-08-01 |
| EP0864741A2 (en) | 1998-09-16 |
| DE59701806D1 (en) | 2000-07-06 |
| US5975062A (en) | 1999-11-02 |
| DE19709903A1 (en) | 1998-09-17 |
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