WO2018050366A1 - Tank system for a motor vehicle - Google Patents

Tank system for a motor vehicle Download PDF

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Publication number
WO2018050366A1
WO2018050366A1 PCT/EP2017/070069 EP2017070069W WO2018050366A1 WO 2018050366 A1 WO2018050366 A1 WO 2018050366A1 EP 2017070069 W EP2017070069 W EP 2017070069W WO 2018050366 A1 WO2018050366 A1 WO 2018050366A1
Authority
WO
WIPO (PCT)
Prior art keywords
line
tank
air
suction pipe
tank system
Prior art date
Application number
PCT/EP2017/070069
Other languages
German (de)
French (fr)
Inventor
Daniel De Haas
Original Assignee
Continental Automotive Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2018050366A1 publication Critical patent/WO2018050366A1/en

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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
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • 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
    • 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
    • F02M25/089—Layout of the fuel vapour installation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/025—Details with respect to the testing of engines or engine parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/228—Warning displays
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
    • F02D41/0045—Estimating, calculating or determining the purging rate, amount, flow or concentration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
    • G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements

Definitions

  • Tank system of a motor vehicle The present invention relates to a tank system of a
  • Motor vehicle with a fuel tank, leading to an activated carbon filter and this to a tank vent valve tank vent line, which splits after the tank vent valve in a first leading into the intake manifold of the associated motor vehicle engine downstream of the throttle line and a second leading into the intake manifold upstream of a turbocharger line , wherein in each line a backflow preventive check valve is arranged, and with means for detecting the introduced from the first line in the suction air amount.
  • Such tank systems for a turbocharger having engines of motor vehicles are known.
  • the deviating from the fuel tank gaseous hydrocarbons are fed to the activated carbon filter and stored there.
  • a tank vent line is used, which leads from the activated carbon filter to a tank vent valve, which is actuated by the corresponding Mo ⁇ gate control.
  • the tank venting line splits into two branch lines, of which a first line opens into the intake manifold of the associated vehicle engine downstream of the throttle valve, while a second line opens into the intake manifold upstream of a turbocharger. In this way, the two modes of operation of the motor vehicle engine - suction operation, charged operation - are taken into account.
  • each branch line is a check valve, which prevents backflow toward the fuel tank. It is of great importance in such a tank system that the system operates faultlessly and has no leaks from which the gases discharged from the fuel tank can escape.
  • this relates to the tank vent line with its two branch lines and the corresponding junction parts in the intake manifold and the corresponding connections to the tank vent valve, the activated carbon filter and the fuel tank.
  • a separate pressure sensor or carried out corresponding design measures such as the execution of a non-detachable (non-destructive) connection of the venting components.
  • the use of a separate sensor requires high costs and the frequency of diagnosis is insufficient. Constructive measures have the disadvantage of a more difficult installation and are associated with higher costs.
  • the present invention has for its object to provide a tank system of the type described above, are available in the defects in the region of the opening into the intake manifold upstream of the turbocharger branch line of the tank ventilation ⁇ line particularly simple and secure.
  • the second line is designed as a double-walled conduit having an inner channel surrounding an outer channel, which is closed at the Mün ⁇ tion point of the inner channel in the suction pipe and bypasses the check valve and in that the means for detecting the amount of air introduced into the intake manifold from the first conduit is arranged to discriminate between the amount of air introduced into the intake manifold in normal bleeding operation and the second conduit via the outer conduit Line in case of a defect introduced into the suction pipe
  • the invention therefore relates to the configuration of the branch line or second line of the tank vent line, which opens into the intake manifold upstream of the turbocharger.
  • This line is designed according to the invention double-walled, wherein it has a In ⁇ nenkanal and an outer channel between the two line walls. The outer channel is in this case closed at the discharge point of the inner channel in the suction pipe.
  • the tank system further comprises means for detecting the amount of air introduced from the first conduit into the draft tube. This device is now designed so that it is able to distinguish between the normal
  • Vent operation in the intake manifold introduced amount of air and the introduced via the outer channel of the second line in case of a defect in the intake manifold amount of false air In this way it can thus be determined whether the second line is defective. Since in normal ventilation operation or rinsing ⁇ operation for the first line in the suction tube introduced air amount (amount of gas) is much less than the case of a defect in the second conduit intake air quantity (quantity of gas), the discrimination can be performed in a simple manner, whether it is false air due to a defect or normal venting.
  • the encapsulated execution of the second, upstream of the turbocharger in the intake manifold opening line of the tank vent line thus ensures that defects (leaks) can be detected on this line immediately.
  • This also applies in particular to the connection point of the second line to the suction pipe, as at this point in case of a defect or a leak false air enters the outer channel and is discharged via the first line into the suction pipe.
  • the non-return valve provided in the second line is bypassed by the outer channel, so that false air can pass through the outer channel in the first line and can be discharged to the suction pipe.
  • the vented gas passes via the inner channel of the second line into the intake manifold at the point of discharge upstream of the turbocharger.
  • the tank system formed according to the invention has a display device which realizes an error indication, when the detector detects false air.
  • the means for detecting the amount of air introduced from the first conduit into the draft tube may include a diagnostic device which provides for permanent monitoring of the second conduit and diagnoses and indicates a failure upon detection of a defect by detecting the introduction of false air into the draft tube.
  • the branching point of the tank venting line, the two check valves and bypass of a check valve may be disposed in a recess formed as a breather ⁇ processing module assembly. From this ventilation module can then go out the double-walled second conduit and branch off the first line.
  • FIG. 1 shows a schematic representation of a tank system of a motor vehicle
  • Figure 2 is an enlarged view of a part of
  • Tank system of Figure 1 The tank system of a motor vehicle shown only schematically in Figure 1 has a fuel tank 1, from which fuel is supplied to a motor 13 via a fuel line (not shown). Furthermore, from the fuel tank 1 is a tank vent line 3, which leads to an activated carbon filter 2. In this, the discharged via the tank vent line 3 gaseous hydrocarbons are stored. From the activated carbon filter 2, the tank vent line 3 continues to a tank vent valve 4, which is controlled by an associated control unit 5 (engine control unit). Beige- .
  • Tankentlwestsventil 4 filtered gaseous hydrocarbons or purge air via the Tankentl marsungs ⁇ line 3 to a branching point 6 of the same, from where a first line 7 goes off and in the intake manifold 9 of the engine 13 downstream of a throttle valve 12 opens and of which a second Line 8 goes off, which opens into the intake manifold 9 upstream of a turbocharger 11 downstream of an associated air filter 10.
  • a check valve 16, 15 is provided in each case, which prevent backflow to the fuel tank 1 out.
  • the engine 13 shown here has, as mentioned, a turbocharger 11 and thus can work in pure suction mode or in supercharged operation.
  • Pressure sensor 14 is provided, with which the pressure in the intake manifold can be detected.
  • Figure 2 shows an enlarged view of a part of
  • This second conduit 8 is designed as a double-walled conduit and has an inner channel 20 and a surrounding outer channel 19.
  • the outer channel 19 bypasses the valve provided in the inner channel 20 check valve 15.
  • Both return ⁇ check valves 15, 16, the environment channel 17 and the Verzwei ⁇ tion point 6 of the two lines are in this case arranged in a module 18 designed as a vent module.
  • the outer channel 19 of the second line 8 is closed at the mouth portions 21 of the second line in the suction pipe 9, while the inner channel 20 opens into the suction pipe 9.
  • An intended diagnostic device (not shown here), which may have, for example, the pressure sensor 14, can then determine whether it is indeed false air or gas discharged in the normal venting operation Suction pipe as a normally vented gas, so that a decision can be made in a simple manner. If false air is diagnosed, for example, an optical alarm signal can be issued, which indicates a defect in the second line 8.

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

Abstract

The invention describes a tank system for a motor vehicle. Downstream of the tank ventilation valve (4), the associated tank ventilation line (3) of the tank system splits into a first line (7) leading into the intake pipe (9) of the associated motor vehicle engine (13) downstream of the throttle valve (12), and into a second line (8) leading into the intake pipe (9) upstream of a turbocharger (11). This second line (8) is designed as a double-walled encapsulated line which comprises an inner channel (20) and an outer channel (19) surrounding said inner channel. In the event of a defect in the second line (8), outside air or gas/air from the inner channel (20) enters the outer channel (19) and flows from said outer channel via the first line (7) into the intake pipe (9). A device detects the inflowing air quantity, diagnoses said air quantity as infiltrated air and triggers an error message.

Description

Beschreibung description
Tanksystem eines Kraftfahrzeuges Die vorliegende Erfindung betrifft ein Tanksystem eines Tank system of a motor vehicle The present invention relates to a tank system of a
Kraftfahrzeuges mit einem Kraftstofftank, einer zu einem Aktivkohlefilter und von diesem zu einem Tankentlüftungsventil führenden Tankentlüftungsleitung, die sich nach dem Tankentlüftungsventil in eine erste in das Saugrohr des zugehörigen Kraftfahrzeugmotors stromab der Drosselklappe führende Leitung und in eine zweite in das Saugrohr stromauf eines Turboladers führende Leitung spaltet, wobei in jeder Leitung ein ein Zurückströmen verhinderndes Rückschlagventil angeordnet ist, und mit einer Einrichtung zur Erfassung der von der ersten Leitung in das Saugrohr eingeführten Luftmenge.  Motor vehicle with a fuel tank, leading to an activated carbon filter and this to a tank vent valve tank vent line, which splits after the tank vent valve in a first leading into the intake manifold of the associated motor vehicle engine downstream of the throttle line and a second leading into the intake manifold upstream of a turbocharger line , wherein in each line a backflow preventive check valve is arranged, and with means for detecting the introduced from the first line in the suction air amount.
Derartige Tanksysteme für einen Turbolader aufweisende Motoren von Kraftfahrzeugen sind bekannt. Die aus dem Kraftstofftank weichenden gasförmigen Kohlenwasserstoffe werden dem Aktiv- kohlefilter zugeführt und dort gespeichert. Hierzu dient eine Tankentlüftungsleitung, die vom Aktivkohlefilter zu einem Tankentlüftungsventil führt, das von der entsprechenden Mo¬ torsteuerung betätigt wird. Nach dem Passieren des Tankentlüftungsventils spaltet sich die Tankentlüftungsleitung in zwei Zweigleitungen auf, von denen eine erste Leitung in das Saugrohr des zugehörigen Fahrzeugmotors stromab der Drosselklappe mündet, während eine zweite Leitung stromauf eines Turboladers in das Saugrohr mündet. Auf diese Weise werden die beiden Betriebsweisen des Kraftfahrzeugmotors - Saugbetrieb, aufgeladener Betrieb - berücksichtigt. Such tank systems for a turbocharger having engines of motor vehicles are known. The deviating from the fuel tank gaseous hydrocarbons are fed to the activated carbon filter and stored there. For this purpose, a tank vent line is used, which leads from the activated carbon filter to a tank vent valve, which is actuated by the corresponding Mo ¬ gate control. After passing through the tank venting valve, the tank venting line splits into two branch lines, of which a first line opens into the intake manifold of the associated vehicle engine downstream of the throttle valve, while a second line opens into the intake manifold upstream of a turbocharger. In this way, the two modes of operation of the motor vehicle engine - suction operation, charged operation - are taken into account.
In jeder Zweigleitung befindet sich ein Rückschlagventil, das ein Zurückströmen in Richtung auf den Kraftstofftank verhindert. Es ist bei einem derartigen Tanksystem von großer Bedeutung, dass das System fehlerfrei arbeitet und keine Lecks aufweist, aus denen die aus dem Kraftstofftank abgeführten Gase austreten können. Insbesondere betrifft dies die Tankentlüftungsleitung mit ihren beiden Zweigleitungen sowie die entsprechenden Einmündungssteilen in das Saugrohr und die entsprechenden Anschlüsse an das Tankentlüftungsventil, den Aktivkohlefilter und den Kraftstofftank. Um eine entsprechende Überwachung bzw. Diagnosefähigkeit des Systems sicherzustellen, hat man dabei einen eigenen Drucksensor eingesetzt oder entsprechende konstruktive Maßnahmen durchgeführt, wie beispielsweise die Ausführung einer nicht lösbaren (zerstörungsfreien) Verbindung der Entlüftungskomponenten. Der Einsatz eines eigenen Sensors erfordert jedoch hohe Kosten und die Häufigkeit der Diagnose ist unzureichend. Konstruktive Maßnahmen haben den Nachteil einer schwierigeren Montage und sind mit höheren Kosten verbunden. In each branch line is a check valve, which prevents backflow toward the fuel tank. It is of great importance in such a tank system that the system operates faultlessly and has no leaks from which the gases discharged from the fuel tank can escape. In particular, this relates to the tank vent line with its two branch lines and the corresponding junction parts in the intake manifold and the corresponding connections to the tank vent valve, the activated carbon filter and the fuel tank. In order to ensure a corresponding monitoring or diagnostic capability of the system, one has thereby used a separate pressure sensor or carried out corresponding design measures, such as the execution of a non-detachable (non-destructive) connection of the venting components. However, the use of a separate sensor requires high costs and the frequency of diagnosis is insufficient. Constructive measures have the disadvantage of a more difficult installation and are associated with higher costs.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Tanksystem der eingangs beschriebenen Art zur Verfügung zu stellen, bei dem Defekte im Bereich der in das Saugrohr stromauf des Turboladers mündenden Zweigleitung der Tankentlüftungs¬ leitung besonders einfach und sicher feststellbar sind. The present invention has for its object to provide a tank system of the type described above, are available in the defects in the region of the opening into the intake manifold upstream of the turbocharger branch line of the tank ventilation ¬ line particularly simple and secure.
Diese Aufgabe wird erfindungsgemäß bei einem Tanksystem der angegebenen Art dadurch gelöst, dass die zweite Leitung als doppelwandig gekapselte Leitung ausgebildet ist, die einen einen Innenkanal umgebenden Außenkanal aufweist, der an der Mün¬ dungsstelle des Innenkanals in das Saugrohr geschlossen ist und der das Rückschlagventil umgeht, und dass die Einrichtung zur Erfassung der von der ersten Leitung in das Saugrohr eingeführten Luftmenge so ausgebildet ist, dass sie eine Unterscheidung zwischen der im normalen Entlüftungsbetrieb in das Saugrohr eingeführten Luftmenge und der über den Außenkanal der zweiten Leitung bei einem Defekt in das Saugrohr eingeführten This object is achieved in a tank system of the specified type in that the second line is designed as a double-walled conduit having an inner channel surrounding an outer channel, which is closed at the Mün ¬ tion point of the inner channel in the suction pipe and bypasses the check valve and in that the means for detecting the amount of air introduced into the intake manifold from the first conduit is arranged to discriminate between the amount of air introduced into the intake manifold in normal bleeding operation and the second conduit via the outer conduit Line in case of a defect introduced into the suction pipe
Falschluftmenge ermöglicht. Permissible air volume.
Die Erfindung betrifft daher die Ausgestaltung der Zweigleitung bzw. zweiten Leitung der Tankentlüftungsleitung, die in das Saugrohr stromauf des Turboladers mündet. Diese Leitung ist erfindungsgemäß doppelwandig ausgeführt, wobei sie einen In¬ nenkanal und einen Außenkanal zwischen den beiden Leitungswänden aufweist. Der Außenkanal ist hierbei an der Mündungsstelle des Innenkanales in das Saugrohr geschlossen. Tritt nunmehr einThe invention therefore relates to the configuration of the branch line or second line of the tank vent line, which opens into the intake manifold upstream of the turbocharger. This line is designed according to the invention double-walled, wherein it has a In ¬ nenkanal and an outer channel between the two line walls. The outer channel is in this case closed at the discharge point of the inner channel in the suction pipe. Enter now
Defekt an der zweiten Leitung bzw. an deren Anschlussstellen auf, der beispielsweise zu einem Austreten von entlüftetem Gas aus dem Innenkanal in den Außenkanal führt, so wird das in den Außenkanal eingetretene Gas (Falschluft) im Außenkanal in Richtung des Tankentlüftungsventils geführt, umgeht dabei das in der zweiten Leitung vorgesehene Rückschlagventil und gelangt über die erste Leitung in das Saugrohr stromab der Drosselklappe. Ein ent¬ sprechender Effekt tritt auf, wenn von außen Luft in den Außenkanal eindringt. Auch diese Falschluft wird über die erste Leitung in das Saugrohr abgeführt. Defect at the second line or at their connection points, which leads, for example, to a leakage of vented gas from the inner channel into the outer channel, the gas entering the outer channel (false air) is guided in the outer channel in the direction of the tank venting valve, thereby bypasses the provided in the second line check valve and passes through the first line in the suction pipe downstream of the throttle. A ent ¬ speaking effect occurs when air enters from the outside into the outer channel. These false air is discharged via the first line in the suction pipe.
Das Tanksystem weist ferner eine Einrichtung zur Erfassung der von der ersten Leitung in das Saugrohr eingeführten Luftmenge auf. Diese Einrichtung ist nunmehr so ausgebildet, dass sie in der Lage ist, eine Unterscheidung zwischen der im normalenThe tank system further comprises means for detecting the amount of air introduced from the first conduit into the draft tube. This device is now designed so that it is able to distinguish between the normal
Entlüftungsbetrieb in das Saugrohr eingeführten Luftmenge und der über den Außenkanal der zweiten Leitung bei einem Defekt in das Saugrohr eingeführten Falschluftmenge durchzuführen. Auf diese Weise kann somit festgestellt werden, ob die zweite Leitung defekt ist. Da die im normalen Entlüftungsbetrieb bzw. Spül¬ betrieb für die erste Leitung in das Saugrohr eingeführte Luftmenge (Gasmenge) wesentlich geringer ist als die bei einem Defekt in der zweiten Leitung angesaugte Luftmenge (Gasmenge) , kann die Unterscheidung in einfacher Weise durchgeführt werden, ob es sich um Falschluft aufgrund eines Defektes oder um eine normale Entlüftung handelt. Vent operation in the intake manifold introduced amount of air and the introduced via the outer channel of the second line in case of a defect in the intake manifold amount of false air. In this way it can thus be determined whether the second line is defective. Since in normal ventilation operation or rinsing ¬ operation for the first line in the suction tube introduced air amount (amount of gas) is much less than the case of a defect in the second conduit intake air quantity (quantity of gas), the discrimination can be performed in a simple manner, whether it is false air due to a defect or normal venting.
Die verkapselte Ausführung der zweiten, stromauf des Turboladers in das Saugrohr mündenden Leitung der Tankentlüftungsleitung stellt somit sicher, dass Defekte (Undichtigkeiten) an dieser Leitung sofort erfasst werden können. Dies betrifft insbesondere auch die Anschlussstelle der zweiten Leitung an das Saugrohr, da auch an dieser Stelle bei einem Defekt bzw. einer Undichtigkeit Falschluft in den Außenkanal gelangt und über die erste Leitung in das Saugrohr abgeführt wird. The encapsulated execution of the second, upstream of the turbocharger in the intake manifold opening line of the tank vent line thus ensures that defects (leaks) can be detected on this line immediately. This also applies in particular to the connection point of the second line to the suction pipe, as at this point in case of a defect or a leak false air enters the outer channel and is discharged via the first line into the suction pipe.
Das in der zweiten Leitung vorgesehene Rückschlagventil wird vom Außenkanal umgangen, damit Falschluft durch den Außenkanal in die erste Leitung gelangen und zum Saugrohr abgeführt werden kann. Beim normalen Entlüftungsbetrieb gelangt das entlüftete Gas über den Innenkanal der zweiten Leitung in das Saugrohr an der Mündungsstelle stromauf des Turboladers. Wenn somit die zweite Leitung demontiert, zerstört oder undicht wird, kann im Saugbetrieb des Motors Luft aus der Umgebung oder der eigentlichen Entlüftungsleitung (dem Innenkanal) in das Saugrohr des Motors unter Umgehung der Drosselklappe strömen. Diese sogenannte Falschluft kann ohne weiteres identifiziert werden. The non-return valve provided in the second line is bypassed by the outer channel, so that false air can pass through the outer channel in the first line and can be discharged to the suction pipe. During normal bleeding operation, the vented gas passes via the inner channel of the second line into the intake manifold at the point of discharge upstream of the turbocharger. Thus, when the second line is disassembled, destroyed or leaking, in the suction operation of the engine, air from the environment or the actual vent line (the inner passage) may flow into the intake manifold of the engine, bypassing the throttle valve. This so-called false air can be easily identified.
Da für die Verwirklichung der erfindungsgemäßen Merkmale keine aufwändigen konstruktiven Maßnahmen oder zusätzliche Sensoren erforderlich sind, wird insgesamt eine kostengünstige Lösung erreicht, die montagefreundlich ist und eine kontinuierliche Überwachung der entsprechenden Zweigleitung ermöglicht. Since no complicated design measures or additional sensors are required for the realization of the features according to the invention, a cost-effective solution is achieved overall, which is easy to install and allows continuous monitoring of the corresponding branch line.
Vorzugsweise weist das erfindungsgemäß ausgebildete Tanksystem eine Anzeigevorrichtung auf, die eine Fehleranzeige realisiert, wenn die Erfassungseinrichtung Falschluft erfasst. Insgesamt kann daher die Einrichtung zur Erfassung der von der ersten Leitung in das Saugrohr eingeführten Luftmenge eine Diagnoseeinrichtung umfassen, die für eine permanente Überwachung der zweiten Leitung sorgt und bei Feststellung eines Defektes durch Erfassung der Einführung von Falschluft in das Saugrohr einen Fehler diagnostiziert und anzeigt. Preferably, the tank system formed according to the invention has a display device which realizes an error indication, when the detector detects false air. Overall, therefore, the means for detecting the amount of air introduced from the first conduit into the draft tube may include a diagnostic device which provides for permanent monitoring of the second conduit and diagnoses and indicates a failure upon detection of a defect by detecting the introduction of false air into the draft tube.
In Weiterbildung der Erfindung können die Verzweigungsstelle der Tankentlüftungsleitung, die beiden Rückschlagventile und die Umgehung des einen Rückschlagventils in einer als Entlüf¬ tungsmodul ausgebildeten Baueinheit angeordnet sein. Von diesem Entlüftungsmodul kann dann die doppelwandig ausgebildete zweite Leitung ausgehen und die erste Leitung abzweigen. In the invention, the branching point of the tank venting line, the two check valves and bypass of a check valve may be disposed in a recess formed as a breather ¬ processing module assembly. From this ventilation module can then go out the double-walled second conduit and branch off the first line.
Die Erfindung wird nachfolgend anhand eine Ausführungsbeispiels in Verbindung mit der Zeichnung im Einzelnen erläutert. Es zeigen : Figur 1 eine schematische Darstellung eines Tanksystems eines Kraftfahrzeuges; und The invention will be explained below with reference to an embodiment in conjunction with the drawings in detail. FIG. 1 shows a schematic representation of a tank system of a motor vehicle; and
Figur 2 eine vergrößerte Darstellung eines Teiles des Figure 2 is an enlarged view of a part of
Tanksystems der Figur 1. Das in Figur 1 nur schematisch dargestellte Tanksystem eines Kraftfahrzeuges besitzt einen Kraftstofftank 1, von dem aus Kraftstoff einem Motor 13 über eine Kraftstoffleitung (nicht gezeigt) zugeführt wird. Ferner geht vom Kraftstofftank 1 eine Tankentlüftungsleitung 3 ab, die zu einem Aktivkohlefilter 2 führt. In diesem werden die über die Tankentlüftungsleitung 3 abgeführten gasförmigen Kohlenwasserstoffe gespeichert. Vom Aktivkohlefilter 2 verläuft die Tankentlüftungsleitung 3 weiter bis zu einem Tankentlüftungsventil 4, das von einer zugehörigen Steuereinheit 5 (Motorsteuereinheit) gesteuert wird. Bei ge- , Tank system of Figure 1. The tank system of a motor vehicle shown only schematically in Figure 1 has a fuel tank 1, from which fuel is supplied to a motor 13 via a fuel line (not shown). Furthermore, from the fuel tank 1 is a tank vent line 3, which leads to an activated carbon filter 2. In this, the discharged via the tank vent line 3 gaseous hydrocarbons are stored. From the activated carbon filter 2, the tank vent line 3 continues to a tank vent valve 4, which is controlled by an associated control unit 5 (engine control unit). Beige- .
6 öffnetem Tankentlüftungsventil 4 gelangen gefilterte gasförmige Kohlenwasserstoffe bzw. Spülluft über die Tankentlüftungs¬ leitung 3 bis zu einem Verzweigungspunkt 6 derselben, von wo aus eine erste Leitung 7 abgeht und in das Saugrohr 9 des Motors 13 stromab einer Drosselklappe 12 mündet und von dem eine zweite Leitung 8 abgeht, die in das Saugrohr 9 stromauf eines Turboladers 11 stromab eines zugehörigen Luftfilters 10 mündet. In beiden Leitungen 7 und 8 ist jeweils ein Rückschlagventil 16, 15 vorgesehen, die ein Zurückströmen zum Kraftstofftank 1 hin verhindern. 6 opened Tankentlüftungsventil 4 filtered gaseous hydrocarbons or purge air via the Tankentlüftungs ¬ line 3 to a branching point 6 of the same, from where a first line 7 goes off and in the intake manifold 9 of the engine 13 downstream of a throttle valve 12 opens and of which a second Line 8 goes off, which opens into the intake manifold 9 upstream of a turbocharger 11 downstream of an associated air filter 10. In both lines 7 and 8, a check valve 16, 15 is provided in each case, which prevent backflow to the fuel tank 1 out.
Der hier dargestellte Motor 13 weist, wie erwähnt, einen Turbolader 11 auf und kann somit im reinen Saugbetrieb oder im aufgeladenen Betrieb arbeiten. The engine 13 shown here has, as mentioned, a turbocharger 11 and thus can work in pure suction mode or in supercharged operation.
Ferner ist im Saugrohr stromab der Drosselklappe 12 ein Further, in the intake manifold downstream of the throttle valve 12 a
Drucksensor 14 vorgesehen, mit dem der Druck im Saugrohr erfasst werden kann. Figur 2 zeigt eine vergrößerte Darstellung eines Teiles desPressure sensor 14 is provided, with which the pressure in the intake manifold can be detected. Figure 2 shows an enlarged view of a part of
Tanksystems der Figur 1, wobei hier insbesondere die Ausbildung der zweiten Leitung der Tankentlüftungsleitung dargestellt ist. Diese zweite Leitung 8 ist als doppelwandig gekapselte Leitung ausgebildet und besitzt einen Innenkanal 20 sowie einen diesen umgebenden Außenkanal 19. Der Außenkanal 19 umgeht das im Innenkanal 20 vorgesehene Rückschlagventil 15. Beide Rück¬ schlagventile 15, 16, der Umgebungskanal 17 und der Verzwei¬ gungspunkt 6 der beiden Leitungen sind hierbei in einer als Entlüftungsmodul ausgebildeten Baueinheit 18 angeordnet. Der Außenkanal 19 der zweiten Leitung 8 ist an der Einmündungssteile 21 der zweiten Leitung in das Saugrohr 9 geschlossen, während der Innenkanal 20 in das Saugrohr 9 mündet. Das hier beschriebene Tanksystem funktioniert in der folgenden Weise : Tank system of Figure 1, wherein in particular the formation of the second line of the tank vent line is shown. This second conduit 8 is designed as a double-walled conduit and has an inner channel 20 and a surrounding outer channel 19. The outer channel 19 bypasses the valve provided in the inner channel 20 check valve 15. Both return ¬ check valves 15, 16, the environment channel 17 and the Verzwei ¬ tion point 6 of the two lines are in this case arranged in a module 18 designed as a vent module. The outer channel 19 of the second line 8 is closed at the mouth portions 21 of the second line in the suction pipe 9, while the inner channel 20 opens into the suction pipe 9. The tank system described here works in the following way:
Es geht hierbei darum, mit einfachen Mitteln zu erfassen, ob die zweite Leitung 8 einen Defekt bzw. eine entsprechende Un¬ dichtigkeit aufweist (Diagnose) und diese Leitung permanent auf eine derartige Fehlermöglichkeit zu überwachen. Tritt eine solche Undichtigkeit auf, beispielsweise dadurch, dass Luft bzw. Gas aus dem Innenkanal 20 oder Umgebungsluft in den Außenkanal gelangt, wird diese „Falschluft" vom Motor über die Umgehung 17 und die erste Leitung 7 in das Saugrohr 9 des Motors stromab der Drosselklappe 12 gesaugt. Eine vorgesehene Diagnoseeinrichtung (hier nicht gezeigt) , die beispielsweise den Drucksensor 14 aufweisen kann, kann dann feststellen, ob es sich in der Tat um Falschluft oder um im normalen Entlüftungsbetrieb abgeführtes Gas handelt. Falschluft strömt hierbei in wesentlich größeren Mengen in das Saugrohr ein als normal entlüftetes Gas, so dass eine Entscheidung in einfacher Weise getroffen werden kann. Wenn Falschluft diagnostiziert wird, kann beispielsweise ein op- tisches Alarmsignal abgegeben werden, das auf einen Defekt in der zweiten Leitung 8 hinweist. It is about to detect with simple means, whether the second line 8 has a defect or a corresponding Un ¬ tightness (diagnosis) and to monitor this line permanently to such an error possibility. If such a leak occurs, for example, because air or gas from the inner channel 20 or ambient air enters the outer channel, this "false air" from the engine via the bypass 17 and the first line 7 in the intake manifold 9 of the engine downstream of the throttle 12. An intended diagnostic device (not shown here), which may have, for example, the pressure sensor 14, can then determine whether it is indeed false air or gas discharged in the normal venting operation Suction pipe as a normally vented gas, so that a decision can be made in a simple manner.If false air is diagnosed, for example, an optical alarm signal can be issued, which indicates a defect in the second line 8.
00
Bezugs zeichenliste Reference sign list
1 Kraftstofftank 1 fuel tank
2 Aktivkohlefilter  2 activated carbon filters
3 Tankentlüftungsleitung 3 tank vent line
4 Tankentlüftungsventil4 tank vent valve
5 Steuereinheit 5 control unit
6 Verzweigungspunkt  6 branch point
7 1. Leitung  7 1st line
8 2. Leitung  8 2nd line
9 Saugrohr  9 intake manifold
10 Luftfilter  10 air filters
11 Turbolader  11 turbochargers
12 Drosselklappe  12 throttle
13 Motor  13 engine
14 Drucksensor  14 pressure sensor
15, 16 Rückschlagventil  15, 16 check valve
17 Umgebungskanal  17 environmental channel
18 Baueinheit  18 assembly
19 Außenkanal  19 outdoor channel
20 Innenkanal  20 inner channel
21 Einmündungsstelle  21 point of entry

Claims

Patentansprüche claims
1. Tanksystem eines Kraftfahrzeuges mit einem Kraftstofftank, einer zu einem Aktivkohlefilter und von diesem zu einem Tankentlüftungsventil führenden Tankentlüftungsleitung, die sich nach dem Tankentlüftungsventil in eine erste in das Saugrohr des zugehörigen Kraftfahrzeugmotors stromab der Drosselklappe führende Leitung und in eine zweite in das Saugrohr stromauf eines Turboladers führende Leitung spaltet, wobei in jeder Leitung ein ein Zurückströmen verhinderndes Rückschlagventil angeordnet ist, dadurch gekennzeichnet, dass die zweite Leitung (8) als doppel- wandig gekapselte Leitung ausgebildet ist, die einen einen Innenkanal (20) umgebenden Außenkanal (19) aufweist, der an der Mündungsstelle (21) des Innenkanals (20) in das Saugrohr1. Tank system of a motor vehicle with a fuel tank, leading to an activated carbon filter and this to a tank vent valve tank vent line leading to the Tankentlüftungsventil in a first in the intake manifold of the associated motor vehicle engine downstream of the throttle line and a second in the intake manifold upstream of a Turbocharger leading line splits, wherein in each line a backflow preventing check valve is arranged, characterized in that the second line (8) is designed as a double-walled conduit having an inner channel (20) surrounding the outer channel (19), at the outlet point (21) of the inner channel (20) in the suction pipe
(9) geschlossen ist und der das Rückschlagventil (15) umgeht, und dass die Einrichtung zur Erfassung der von der ersten Leitung (7) in das Saugrohr (9) eingeführten Luftmenge so ausgebildet ist, dass sie eine Unterscheidung zwischen der im normalen Entlüftungsbetrieb in das Saugrohr(9) is closed and bypasses the check valve (15), and that the means for detecting the amount of air introduced from the first conduit (7) into the suction pipe (9) is arranged to discriminate between the normal operation of the exhaust the suction pipe
(9) eingeführten Luftmenge und der über den Außenkanal (19) der zweiten Leitung (8) bei einem Defekt in das Saugrohr (9) eingeführten Falschluftmenge ermöglicht. (9) introduced quantity of air and the over the outer channel (19) of the second line (8) in case of a defect in the suction pipe (9) introduced quantity of false air.
2. Tanksystem nach Anspruch 1 , dadurch gekennzeichnet, dass es eine Anzeigeeinrichtung aufweist, die eine Fehleranzeige realisiert, wenn die Erfassungseinrichtung Falschluft erfasst . 2. Tank system according to claim 1, characterized in that it comprises a display device which realizes an error indication when the detection device detects false air.
3. Tanksystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einrichtung zur Erfassung der von der ersten Leitung (7) in das Saugrohr (9) eingeführten Luftmenge eine Diagnoseeinrichtung umfasst. 3. Tank system according to claim 1 or 2, characterized in that the means for detecting the of the first line (7) in the suction pipe (9) introduced amount of air comprises a diagnostic device.
4. Tanksystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Verzweigungsstelle (6) der Tankentlüftungsleitung (3) , die beiden Rückschlagventile (15, 16) und die Umgehung (17) des einen Rückschlagventils (15) in einer als Entlüftungsmodul (18) ausgebildeten4. Tank system according to one of the preceding claims, characterized in that the branch point (6) of the tank vent line (3), the two check valves (15, 16) and the bypass (17) of a check valve (15) in a vent module (18 ) trained
Baueinheit angeordnet sind. Assembly are arranged.
PCT/EP2017/070069 2016-09-13 2017-08-08 Tank system for a motor vehicle WO2018050366A1 (en)

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