WO2001073283A1 - Tank ventilation system for a motor vehicle and method for operating a system of this type - Google Patents
Tank ventilation system for a motor vehicle and method for operating a system of this type Download PDFInfo
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- WO2001073283A1 WO2001073283A1 PCT/DE2001/001141 DE0101141W WO0173283A1 WO 2001073283 A1 WO2001073283 A1 WO 2001073283A1 DE 0101141 W DE0101141 W DE 0101141W WO 0173283 A1 WO0173283 A1 WO 0173283A1
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- valve
- tank ventilation
- shut
- tank
- internal combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
Definitions
- Tank ventilation system for a motor vehicle and method for operating such
- the invention first relates to a tank ventilation system for a motor vehicle according to the preamble of claim 1.
- Such a tank ventilation system can be seen, for example, from DE 40 03 751 AI.
- a method for leak testing of such a tank ventilation system is known for example from DE 196 36 431 AI or from DE 198 09 384 AI.
- tank ventilation valve In known tank ventilation systems, fuel that is outgassed from the tank is supplied to the internal combustion engine in which it is burned by opening the tank ventilation valve (TEV).
- TEV tank ventilation valve
- the tank ventilation valve is optimized for its flow properties, but not for its tightness when closed. A significant reduction or even complete elimination of a leak in the tank ventilation valve can be disadvantageous with regard to the further optimization of the flow properties of the tank ventilation valve.
- the object of the invention is therefore to further develop a tank ventilation system for a motor vehicle in such a way that leaks in the tank ventilation valve can be avoided while at the same time having optimal flow properties of this valve.
- a controllable shut-off means is arranged in series with the tank ventilation valve.
- This controllable shut-off device improves the sealing of the tank system, especially when the tank ventilation valve is closed.
- this shut-off means forms a single structural unit with the tank ventilation valve.
- shut-off means is a separate valve which is arranged in the valve line between the internal combustion engine and the tank ventilation valve.
- the shut-off means can also be a separate valve which is arranged in the valve line between the tank ventilation valve and the activated carbon filter.
- the maximum flow of the shut-off valve is advantageously at least as large as the maximum flow of the tank ventilation valve.
- the invention further relates to a method for controlling such a shut-off valve of a tank ventilation system.
- a method for controlling such a shut-off valve of a tank ventilation system is based on the problem of actuating the shut-off valve in connection with the tank ventilation valve in such a way that on the one hand the function of the tank ventilation system is not impaired and on the other hand optimal leak tests are possible.
- This problem is solved by the shut-off valve in the following operating states:
- Fig. 1 shows schematically a tank ventilation system making use of the invention
- An exemplary embodiment of a tank ventilation system of a soft vehicle shown in FIG. 1, comprises a tank 10, an adsorption filter 20, for example an activated carbon filter, which is connected to the tank 10 via a filter line 12 and has a ventilation line 22 which can be connected to the environment, and a tank ventilation valve 30, which can be connected on the one hand to the adsorption filter 20 via a valve line 24 and on the other hand to an intake manifold 40 of an internal combustion engine 44 via a valve line 42.
- a shut-off valve 90 which can be controlled by a circuit unit 60, is arranged in the valve line 42 and will be discussed in more detail below.
- a pump 50 is provided which is driven, for example, by an electric motor (not shown).
- the pump is controlled by the circuit unit 60.
- a switch valve 70 is connected downstream of the pump 50, for example in the form of a 3/2-way valve, as shown in FIG. 1.
- a reference leak 81 is arranged in a separate branch 80.
- the size of the reference leak 81 is selected so that it corresponds to the size of a leak to be detected.
- This reference leak can for example also be part of the changeover valve 70, for example due to a channel narrowing or the like, so that in this case an additional reference branch 80 can be omitted (not shown).
- the pump 50 is actuated and an alternating pressure is introduced into the tank ventilation system and - by switching the valve 70 - into the reference leak 81.
- the current I M to be supplied to the pump motor which flows through a resistor R M in the event of a voltage drop, is detected and supplied to the circuit unit 60.
- the tightness of the tank ventilation system can be concluded in a manner known per se and explained, for example, in DE 196 36 431 AI or DE 198 09 384 AI, to which reference is made here.
- Any leakage that may occur at the tank ventilation valve 30 would now disrupt such a leak test, for example.
- a leak in the tank vent tion valve 30 would also adversely affect the overall emissions of a vehicle.
- shut-off valve 90 is provided, which can be controlled by the circuit unit 60.
- This shut-off valve 90 is optimized with regard to its shut-off properties, whereas the tank ventilation valve 30 is optimized with regard to its flow-through properties, but not with regard to its shut-off properties.
- the shut-off valve 90 can, for example, as shown in FIG. 1, be arranged between the internal combustion engine 44 and the tank ventilation valve 30, but it can also be arranged between the tank ventilation valve 30 and the activated carbon filter 20 (not shown). Finally, it can also form a structural unit with the tank ventilation valve 30.
- the shut-off valve 90 is designed such that its maximum flow in the open state corresponds at least to the maximum flow in the tank ventilation valve 30 in its fully open state.
- shutoff valve 90 There are several ways to control the shutoff valve 90.
- a first exemplary embodiment of a method for controlling the shut-off valve 90 shown in Fig. 2, it is checked in step 201 whether there is a leak test. If this is the case, the shut-off valve 90 is closed (step 202); if this is not the case, it is opened (step 205). Both after step 202 "Close” and after step 205 "Open", the query is made as to whether there is a leak test (step 201) again. In other words, the process steps are run through cyclically, with a continuous check being carried out to determine whether there is a leak test.
- step 301 it is first checked in step 301 whether there is a leak test. If this is the case, the shut-off valve 90 is closed (step 302). If this is not the case, it is checked whether the internal combustion engine has come to a standstill. If this is the case, the shut-off valve 90 is closed (step 302), if this is not the case, the shut-off valve 90 is opened (step 305).
- the queries as to whether there is a leak test or a shutdown of the internal combustion engine are run through cyclically, so that after closing (step 302) and after opening (step 305) the shut-off valve 90, steps 301 (query whether a leak test is present) is present) and 303 (query whether the internal combustion engine is at a standstill) are run through again.
- the shut-off valve 90 is therefore closed both during a leak test and when the internal combustion engine is at a standstill.
- a third embodiment of the method according to the invention shown in FIG. 4, it is first checked in a step 401 whether there is a leak test. If so, the shutoff valve 90 is closed in step 402.
- step 403 it is checked in a step 403 whether the internal combustion engine has come to a standstill. If this is the case, the shut-off valve 90 is closed; if this is not the case, a check is carried out in a step 404 to determine whether tank ventilation is taking place. If this is not the case, the shut-off valve 90 is closed again, but if this is the case it is opened.
- the shut-off valve 90 is therefore closed in other words:
- the advantage of the tank ventilation system described above and the method for controlling the shut-off valve 90 of this tank ventilation system lies in the simple technical implementation.
- existing tank ventilation systems can be retrofitted with simple construction measures.
- the tank ventilation system and the method for controlling the shut-off valve 90 connected in series with the tank ventilation valve 30 enable on the one hand an increase in the selectivity of the leak test, and on the other hand prevent outgassing of harmful fuel vapors into the environment when the tank ventilation valve 30 leaks.
Abstract
The invention relates to a tank ventilation system for a motor vehicle comprising a fuel tank (10) and an adsorption filter (20) which is connected to the fuel tank (10) via a filter line (12) and which has a ventilation line (22). The inventive tank ventilation system also comprises a tank ventilation valve (30), which is connected to the induction tube (40) of an internal combustion engine (44) via valve lines (24, 42), and is characterized in that an actuatable cut-off means (90) is connected in series to the tank ventilation valve (30).
Description
Tankentlüftungsanlage für ein Kraftfahrzeug und Verfahren zum Betreiben einer solchenTank ventilation system for a motor vehicle and method for operating such
Stand der TechnikState of the art
Die Erfindung betrifft zunächst eine Tankentlüftungsanlage für ein Kraftfahrzeug gemäß dem Oberbegriff des Anspruchs 1.The invention first relates to a tank ventilation system for a motor vehicle according to the preamble of claim 1.
Eine solche Tankentlüftungsanlage geht beispielsweise aus der DE 40 03 751 AI hervor. Ein Verfahren zur Dichtheitsprüfung einer derartigen Tankentlüftungsanlage ist beispielsweise aus der DE 196 36 431 AI oder aus der DE 198 09 384 AI bekannt.Such a tank ventilation system can be seen, for example, from DE 40 03 751 AI. A method for leak testing of such a tank ventilation system is known for example from DE 196 36 431 AI or from DE 198 09 384 AI.
Aufgrund nationaler und internationaler Vorschriften wird das Einhalten bestimmter Grenzwerte hinsichtlich
des Emissionsverhaltens von Fahrzeugen mit Brennkraftmaschinen gefordert, insbesondere auch im Hinblick auf die Emission von Kohlenwasserstoffen. In diesem Zusammenhang uss auch der Anteil der über eine Leckage des Tankentlüftungsventils emittierten Kohlenwasserstoffe in Betracht gezogen und möglichst eliminiert werden.Due to national and international regulations, compliance with certain limit values is required the emission behavior of vehicles with internal combustion engines, especially with regard to the emission of hydrocarbons. In this context, the proportion of the hydrocarbons emitted by a leak in the tank ventilation valve must also be taken into account and eliminated as far as possible.
Bei bekannten Tankentlüftungsanlagen wird durch Öffnen des Tankentlüftungsventils (TEV) Kraftstoff, der aus dem Tank ausgegast ist, der Brennkraftmaschine zugeführt, in der er verbrannt wird. Das Tankentluftungsventil ist hierzu auf seine Durchflusseigenschaften, nicht jedoch im Hinblick auf seine Dichtheit im geschlossenen Zustand optimiert. Eine erhebliche Reduzierung oder gar vollständige Eliminierung einer Leckage des Tankentlüftungsventils kann im Hinblick auf die weitere Optimierung der Durchflusseigenschaften des Tankentlüftungsventils nachteilig sein.In known tank ventilation systems, fuel that is outgassed from the tank is supplied to the internal combustion engine in which it is burned by opening the tank ventilation valve (TEV). For this purpose, the tank ventilation valve is optimized for its flow properties, but not for its tightness when closed. A significant reduction or even complete elimination of a leak in the tank ventilation valve can be disadvantageous with regard to the further optimization of the flow properties of the tank ventilation valve.
Aufgabe der Erfindung ist es daher, eine Tankentlüftungsanlage für ein Kraftfahrzeug dahingehend weiterzu- entwickeln, dass Leckagen des Tankentlüftungsventils bei gleichzeitig optimalen Durchflusseigenschaften dieses Ventils vermieden werden können.The object of the invention is therefore to further develop a tank ventilation system for a motor vehicle in such a way that leaks in the tank ventilation valve can be avoided while at the same time having optimal flow properties of this valve.
Vorteile der ErfindungAdvantages of the invention
Diese Aufgabe wird bei einer Tankentlüftungsanlage für ein Kraftfahrzeug der eingangs beschriebenen Art dadurch gelöst, dass in Reihe zu dem Tankentluftungsventil ein ansteuerbares Absperrmittel angeordnet ist.
Dieses ansteuerbare Absperrmittel verbessert die Abdichtung des Tanksystems, ganz besonders auch dann, wenn das Tankentluftungsventil geschlossen ist.This object is achieved in a tank ventilation system for a motor vehicle of the type described in the introduction in that a controllable shut-off means is arranged in series with the tank ventilation valve. This controllable shut-off device improves the sealing of the tank system, especially when the tank ventilation valve is closed.
Bei einer vorteilhaften Ausführungsform bildet dieses Absperrmittel mit dem Tankentlüftungsventils eine einzige Baueinheit.In an advantageous embodiment, this shut-off means forms a single structural unit with the tank ventilation valve.
Bei einer anderen vorteilhaften Ausführungsform ist vorgesehen, dass das Absperrmittel ein separates Ventil ist, das in der Ventilleitung zwischen der Brennkraftmaschine und dem Tankentluftungsventil angeordnet ist.In another advantageous embodiment it is provided that the shut-off means is a separate valve which is arranged in the valve line between the internal combustion engine and the tank ventilation valve.
Das Absperrmittel kann ferner auch ein separates Ventil sein, das in der Ventilleitung zwischen dem Tankentluftungsventil und dem Aktivkohlefilter angeordnet ist.The shut-off means can also be a separate valve which is arranged in the valve line between the tank ventilation valve and the activated carbon filter.
Bei allen Ausführungsformen ist der Maximaldurchfluss des Absperrventils vorteilhafterweise mindestens so groß wie der Maximaldurchfluss des Tankentlüftungsventils.In all embodiments, the maximum flow of the shut-off valve is advantageously at least as large as the maximum flow of the tank ventilation valve.
Die Erfindung betrifft ferner ein Verfahren zur An- steuerung eines solchen Absperrventils einer Tankentlüftungsanlage. Diesbezüglich liegt ihr das Problem zugrunde, das Absperrventil in Verbindung mit dem Tankentluftungsventil so anzusteuern, dass einerseits die Funktion der Tankentlüftungsanlage nicht beeinträchtigt wird, andererseits optimale Dichtheitsprüfungen möglich sind.
Dieses Problem wird dadurch gelöst, dass das Absperrventil bei folgenden Betriebszuständen:The invention further relates to a method for controlling such a shut-off valve of a tank ventilation system. In this regard, it is based on the problem of actuating the shut-off valve in connection with the tank ventilation valve in such a way that on the one hand the function of the tank ventilation system is not impaired and on the other hand optimal leak tests are possible. This problem is solved by the shut-off valve in the following operating states:
bei einer Dichtheitsprüfung oder sowohl bei einer Dichtheitsprüfung als auch bei Stillstand der Brennkraftmaschine oder sowohl bei einer Dichtheitsprüfung als auch bei laufender Brennkraftmaschine dann, wenn keine Tankentlüftung erfolgt, als auch bei Stillstand der Brennkraftmaschineduring a leak test or both during a leak test and when the internal combustion engine is at a standstill or both during a leak test and when the internal combustion engine is running, when there is no tank ventilation, and when the internal combustion engine is at a standstill
geschlossen und bei allen übrigen Betriebszuständen geöffnet wird.is closed and opened in all other operating states.
Zeichnungdrawing
Weitere Vorteile und Merkmale der Erfindung sind Gegenstand der nachfolgenden Beschreibung sowie der zeichnerischen Darstellung eines Ausführungsbeispiels der Erfindung.Further advantages and features of the invention are the subject of the following description and the drawing of an embodiment of the invention.
In der Zeichnung zeigen:The drawing shows:
Fig. 1 schematisch eine von der Erfindung Gebrauch machende Tankentlüftungsanlage undFig. 1 shows schematically a tank ventilation system making use of the invention and
Fig. 2-4 Ablaufdiagramme von Verfahren zur Ansteuerung eines Absperrventils einer erfindungsgemäßen Tankentlüftungsanlage .
Beschreibung eines Ausführungsbeispiels2-4 flow diagrams of methods for controlling a shut-off valve of a tank ventilation system according to the invention. Description of an embodiment
Ein Ausführungsbeispiel einer Tankentlüftungsanlage eines Karftfahrzeugs, dargestellt in Fig. 1, umfasst einen Tank 10, ein Adsorptionsfilter 20, beispielsweise ein Aktivkohlefilter, das mit dem Tank 10 über eine Filterleitung 12 verbunden ist und eine mit der Umgebung verbindbare Belüftungsleitung 22 aufweist, sowie ein Tankentluftungsventil 30, das einerseits mit dem Adsorptionsfilter 20 über eine Ventilleitung 24 und andererseits mit einem Saugrohr 40 einer Brennkraftmaschine 44 über eine Ventilleitung 42 verbindbar ist. In der Ventilleitung 42 ist ein durch eine Schaltungseinheit 60 ansteuerbares Absperrventil 90 angeordnet, auf das weiter unten näher eingegangen wird.An exemplary embodiment of a tank ventilation system of a soft vehicle, shown in FIG. 1, comprises a tank 10, an adsorption filter 20, for example an activated carbon filter, which is connected to the tank 10 via a filter line 12 and has a ventilation line 22 which can be connected to the environment, and a tank ventilation valve 30, which can be connected on the one hand to the adsorption filter 20 via a valve line 24 and on the other hand to an intake manifold 40 of an internal combustion engine 44 via a valve line 42. A shut-off valve 90, which can be controlled by a circuit unit 60, is arranged in the valve line 42 and will be discussed in more detail below.
Durch Verdunstung enstehen in dem Tank 10 Kohlenwasserstoffe, die sich in dem Adsorptionsfilter 20 anlagern. Zur Regenerierung des Adsorptionsfilters 20 wird das Tankentluftungsventil 30 geöffnet, so dass aufgrund des in dem Saugrohr 40 herrschenden Unterdrucks Luft der Atmosphäre durch das Adsorptionsfilter 20 gesaugt wird, wodurch die in dem Adsorptionsfilter 20 angelagerten Kohlenwasserstoffe in das Saugrohr 40 gesaugt und der Brennkraftmaschine 44 zugeführt werden.Evaporation produces hydrocarbons in the tank 10, which accumulate in the adsorption filter 20. To regenerate the adsorption filter 20, the tank ventilation valve 30 is opened, so that air from the atmosphere is sucked through the adsorption filter 20 due to the negative pressure prevailing in the suction pipe 40, as a result of which the hydrocarbons accumulated in the adsorption filter 20 are sucked into the suction pipe 40 and fed to the internal combustion engine 44 ,
Um die Funktionsfähigkeit einer solchen Tankentlüftungsanlage diagnostizieren zu können, ist eine Pumpe 50 vorgesehen, die beispielsweise von einem Elektromotor (nicht dargestellt) angetrieben wird. Die Pumpe
wird von der Schaltungseinheit 60 angesteuert. Der Pumpe 50 nachgeschaltet ist ein Umschaltventil 70, beispielsweise in Form eines 3/2-Wegeventils, wie in Fig. 1 dargestellt. Parallel zu diesem Umschaltventil 70 ist in einem separaten Zweig 80 ein Referenzleck 81 angeordnet. Die Größe des Referenzlecks 81 ist so gewählt, dass sie der Größe eines zu erfassenden Lecks entspricht. Dieses Referenzleck kann beispielsweise auch Bestandteil des Umschaltventils 70 sein, etwa durch eine Kanalverengung oder dergleichen, so dass in diesem Falle ein zusätzlicher Referenzzweig 80 entfallen kann (nicht dargestellt).In order to be able to diagnose the functionality of such a tank ventilation system, a pump 50 is provided which is driven, for example, by an electric motor (not shown). The pump is controlled by the circuit unit 60. A switch valve 70 is connected downstream of the pump 50, for example in the form of a 3/2-way valve, as shown in FIG. 1. In parallel to this changeover valve 70, a reference leak 81 is arranged in a separate branch 80. The size of the reference leak 81 is selected so that it corresponds to the size of a leak to be detected. This reference leak can for example also be part of the changeover valve 70, for example due to a channel narrowing or the like, so that in this case an additional reference branch 80 can be omitted (not shown).
Zur Dichtheitsprüfung der Tankentlüftungsanlage wird die Pumpe 50 betätigt und dadurch abwechselnd in die Tankentlüftungsanlage und - durch Umschalten des Ventils 70 - in das Referenzleck 81 ein Überdruck eingebracht. Hierbei wird beispielsweise der dem Pumpenmotor zuzuführende Strom IM, der bei einem Spannungsabfall über einen Widerstand RM fließt, erfasst und der Schaltungseinheit 60 zugeführt. Aufgrund des zeitlichen Verlaufs des so erfassten Stroms IM kann auf an sich bekannte und beispielsweise in der DE 196 36 431 AI oder DE 198 09 384 AI, auf die vorliegend Bezug genommen wird, erläuterte Weise auf die Dichtheit der Tankentlüftungsanlage geschlossen werden.To test the tightness of the tank ventilation system, the pump 50 is actuated and an alternating pressure is introduced into the tank ventilation system and - by switching the valve 70 - into the reference leak 81. In this case, for example, the current I M to be supplied to the pump motor, which flows through a resistor R M in the event of a voltage drop, is detected and supplied to the circuit unit 60. On the basis of the time profile of the current I M recorded in this way, the tightness of the tank ventilation system can be concluded in a manner known per se and explained, for example, in DE 196 36 431 AI or DE 198 09 384 AI, to which reference is made here.
Eine eventuell an dem Tankentluftungsventil 30 auftretende Leckage würde nun beispielsweise eine solche Dichtheitsprüfung stören. Eine Leckage des Tankentlüf-
tungsventils 30 würde sich darüber hinaus nachteilig auf die Gesamtemissionen eines Fahrzeugs auswirken.Any leakage that may occur at the tank ventilation valve 30 would now disrupt such a leak test, for example. A leak in the tank vent tion valve 30 would also adversely affect the overall emissions of a vehicle.
Um diese Nachteile zu vermeiden, ist das Absperrventil 90 vorgesehen, das durch die Schaltungseinheit 60 ansteuerbar ist.In order to avoid these disadvantages, the shut-off valve 90 is provided, which can be controlled by the circuit unit 60.
Dieses Absperrventil 90 ist hinsichtlich seiner Absperreigenschaften optimiert, wohingegen das Tankentluftungsventil 30 hinsichtlich seiner Durchflusseigenschaften, nicht jedoch hinsichtlich seiner Absperreigenschaften optimiert ist. Das Absperrventil 90 kann beispielsweise, wie in Fig. 1 dargestellt, zwischen der Brennkraftmaschine 44 und dem Tankentluftungsventil 30 angeordnet sein, es kann aber auch zwischen dem Tankentluftungsventil 30 und dem Aktivkohlefilter 20 angeordnet sein (nicht dargestellt). Es kann schließlich auch mit dem Tankentluftungsventil 30 eine Baueinheit bilden.This shut-off valve 90 is optimized with regard to its shut-off properties, whereas the tank ventilation valve 30 is optimized with regard to its flow-through properties, but not with regard to its shut-off properties. The shut-off valve 90 can, for example, as shown in FIG. 1, be arranged between the internal combustion engine 44 and the tank ventilation valve 30, but it can also be arranged between the tank ventilation valve 30 and the activated carbon filter 20 (not shown). Finally, it can also form a structural unit with the tank ventilation valve 30.
Das Absperrventil 90 ist so ausgebildet, dass sein Maximaldurchfluss im geöffneten Zustand wenigstens dem Maximaldurchfluss des Tankentlüftungsventils 30 in dessen völlig geöffnetem Zustand entspricht.The shut-off valve 90 is designed such that its maximum flow in the open state corresponds at least to the maximum flow in the tank ventilation valve 30 in its fully open state.
In Fig. 2-4 sind Verfahren zur Ansteuerung des Absperrventils 90 in Form von Ablaufdiagrammen dargestellt.2-4 show methods for activating the shut-off valve 90 in the form of flow diagrams.
Es existieren mehrere Möglichkeiten, das Absperrventil 90 anzusteuern. Bei einem ersten Ausführungsbeispiel eines Verfahrens zur Ansteuerung des Absperrventils 90,
dargestellt in Fig. 2, wird in Schritt 201 geprüft, ob eine Dichtheitsprüfung vorliegt. Trifft dies zu, wird das Absperrventil 90 geschlossen (Schritt 202), trifft dies nicht zu, wird es geöffnet (Schritt 205). Sowohl nach dem Schritt 202 "Schließen" als auch nach dem Schritt 205 "Öffnen" erfolgt die Abfrage, ob eine Dichtheitsprüfung vorliegt (Schritt 201) von neuem. Die Verfahrensschritte werden mit anderen Worten zyklisch durchlaufen, wobei kontinuierlich geprüft wird, ob eine Dichtheitsprüfung vorliegt.There are several ways to control the shutoff valve 90. In a first exemplary embodiment of a method for controlling the shut-off valve 90, shown in Fig. 2, it is checked in step 201 whether there is a leak test. If this is the case, the shut-off valve 90 is closed (step 202); if this is not the case, it is opened (step 205). Both after step 202 "Close" and after step 205 "Open", the query is made as to whether there is a leak test (step 201) again. In other words, the process steps are run through cyclically, with a continuous check being carried out to determine whether there is a leak test.
Bei einem anderen Ausführungsbeispiel eines Verfahrens zum Ansteuern des Absperrventils 90, dargestellt in Fig. 3, wird zunächst in Schritt 301 geprüft, ob eine Dichtheitsprüfung vorliegt. Ist dies der Fall, wird das Absperrventil 90 geschlossen (Schritt 302), ist dies nicht der Fall, wird geprüft, ob ein Stillstand der Brennkraftmaschine vorliegt. Trifft dies zu, wird das Absperrventil 90 geschlossen (Schritt 302), ist dies nicht der Fall, wird das Absperrventil 90 geöffnet (Schritt 305). Auch in diesem Falle werden die Abfragen, ob eine Dichtheitsprüfung oder ein Stillstand der Brennkraftmaschine vorliegt, zyklisch durchlaufen, so dass nach einem Schließen (Schritt 302) und nach einem Öffnen (Schritt 305) des Absperrventils 90 die Schritte 301 (Abfrage, ob eine Dichtheitsprüfung vorliegt) sowie 303 (Abfrage, ob Stillstand der Brennkraftmaschine vorliegt) erneut durchlaufen werden. Bei dieser Ausführungsform wird das Absperrventil 90 daher sowohl bei einer Dichtheitsprüfung als auch bei einem Stillstand der Brennkraftmaschine geschlossen.
Bei einer dritten Ausführungsform des erfindungsgemäßen Verfahrens, dargestellt in Fig. 4, wird zunächst in einem Schritt 401 überprüft, ob eine Dichtheitsprüfung vorliegt. Wenn dies der Fall ist, wird das Absperrventil 90 in Schritt 402 geschlossen. Ist dies nicht der Fall, wird in einem Schritt 403 überprüft, ob ein Stillstand der Brennkraftmaschine vorliegt. Trifft dies zu, wird das Absperrventil 90 geschlossen, trifft dies nicht zu, wird in einem Schritt 404 geprüft, ob eine Tankentlüftung stattfindet. Ist dies nicht der Fall, wird das Absperrventil 90 wiederum geschlossen, ist dies jedoch der Fall, wird es geöffnet. Auch diese Verfahrensschritte werden zyklisch durchlaufen.In another exemplary embodiment of a method for actuating the shut-off valve 90, shown in FIG. 3, it is first checked in step 301 whether there is a leak test. If this is the case, the shut-off valve 90 is closed (step 302). If this is not the case, it is checked whether the internal combustion engine has come to a standstill. If this is the case, the shut-off valve 90 is closed (step 302), if this is not the case, the shut-off valve 90 is opened (step 305). In this case, too, the queries as to whether there is a leak test or a shutdown of the internal combustion engine are run through cyclically, so that after closing (step 302) and after opening (step 305) the shut-off valve 90, steps 301 (query whether a leak test is present) is present) and 303 (query whether the internal combustion engine is at a standstill) are run through again. In this embodiment, the shut-off valve 90 is therefore closed both during a leak test and when the internal combustion engine is at a standstill. In a third embodiment of the method according to the invention, shown in FIG. 4, it is first checked in a step 401 whether there is a leak test. If so, the shutoff valve 90 is closed in step 402. If this is not the case, it is checked in a step 403 whether the internal combustion engine has come to a standstill. If this is the case, the shut-off valve 90 is closed; if this is not the case, a check is carried out in a step 404 to determine whether tank ventilation is taking place. If this is not the case, the shut-off valve 90 is closed again, but if this is the case it is opened. These process steps are also run through cyclically.
Das Absperrventil 90 ist daher mit anderen Worten geschlossen:The shut-off valve 90 is therefore closed in other words:
bei einer Dichtheitsprüfung. Dies ermöglicht eine Steigerung der Trennschärfe einer Dichtheitsprüfung, da eventuell auftretende Leckagen des Tankentlüftungsventils 30 auf diese Weise die Dichtheitprüfung nicht beeinträchtigen. oder sowohl bei einer Dichtheitsprüfung als auch bei einem Stillstand der Brennkraftmaschine, um so zusätzlich ein Ausgasen des Kraftstoffs bei undichtem Tankentluftungsventil 30 in die Umgebung zu verhindern. oder sowohl bei einer Dichtheitsprüfung als auch bei laufender Brennkraftmaschine dann, wenn keine Tankent-
lüftung erfolgt, als auch bei Stillstand der Brennkraftmaschine .during a leak test. This enables the selectivity of a leak test to be increased, since any leaks in the tank ventilation valve 30 that occur do not impair the leak test in this way. or both during a leak test and when the internal combustion engine is at a standstill, so as to additionally prevent the fuel from outgassing into the environment when the tank ventilation valve 30 is leaking. or both during a leak test and when the internal combustion engine is running if no tank ventilation takes place, as well as when the internal combustion engine is at a standstill.
Der Vorteil der oben beschriebenen Tankentlüftungsanlage und des Verfahrens zur Ansteuerung des Absperrventils 90 dieser Tankentlüftungsanlage liegt in der einfachen technischen Realisierung. Insbesondere können mit einfachen Baumaßnahmen bestehende Tankentlüftungsanlagen nachgerüstet werden. Die Tankentlüftungsanlage und das Verfahren zur Ansteuerung des zu dem Tankentluftungsventil 30 in Reihe geschalteten Absperrventils 90 ermöglichen einerseits eine Steigerung der Trennschärfe der Dichtheitsprüfung, andererseits wird ein Ausgasen schädlicher Kraftstoffdämpfe in die Umgebung bei leckendem Tankentluftungsventil 30 verhindert.
The advantage of the tank ventilation system described above and the method for controlling the shut-off valve 90 of this tank ventilation system lies in the simple technical implementation. In particular, existing tank ventilation systems can be retrofitted with simple construction measures. The tank ventilation system and the method for controlling the shut-off valve 90 connected in series with the tank ventilation valve 30 enable on the one hand an increase in the selectivity of the leak test, and on the other hand prevent outgassing of harmful fuel vapors into the environment when the tank ventilation valve 30 leaks.
Claims
Tankentlüftungsanlage für ein Kraftfahrzeug mitTank ventilation system for a motor vehicle with
- einem Kraftstofftank (10),- a fuel tank (10),
- einem Adsorptionsfilter (20), das mit dem Kraftstofftank (10) über eine Filterleitung (12) verbunden ist und welches eine Belüftungsleitung (22) aufweist, und- An adsorption filter (20) which is connected to the fuel tank (10) via a filter line (12) and which has a ventilation line (22), and
- einem Tankentluftungsventil (30), das über Ventilleitungen (24, 42) mit dem Saugrohr (40) einer Brennkraftmaschine (44) verbunden ist, dadurch gekennzeichnet, dass in Reihe zu dem Tankentluftungsventil (30) ein ansteuerbares Absperrmittel (90) angeordnet ist.- A tank ventilation valve (30), which is connected via valve lines (24, 42) to the intake manifold (40) of an internal combustion engine (44), characterized in that a controllable shut-off means (90) is arranged in series with the tank ventilation valve (30).
Tankentlüftungsanlage nach Anspruch 1, dadurch gekennzeichnet, dass das ansteuerbare Absperrmittel (90) eine Baueinheit mit dem Tankentluftungsventil (30) bildet.Tank ventilation system according to claim 1, characterized in that the controllable shut-off means (90) forms a structural unit with the tank ventilation valve (30).
Tankentlüftungsanlage nach Anspruch 1, dadurch gekennzeichnet, dass das ansteuerbare Absperrmittel (90) ein separates Ventil ist, das in der Ventilleitung (42) zwischen der Brennkraftmaschine (44) und dem Tankentluftungsventil (30) angeordnet ist. Tank ventilation system according to claim 1, characterized in that the controllable shut-off means (90) is a separate valve which is arranged in the valve line (42) between the internal combustion engine (44) and the tank ventilation valve (30).
4. Tankentlüftungsanlage nach Anspruch 1, dadurch gekennzeichnet, dass das ansteuerbare Absperrmittel (90) ein separates Ventil ist, das in der Ventilleitung (24) zwischen dem Tankentluftungsventil (30) und dem Aktivkohlefilter (20) angeordnet ist.4. Tank ventilation system according to claim 1, characterized in that the controllable shut-off means (90) is a separate valve which is arranged in the valve line (24) between the tank ventilation valve (30) and the activated carbon filter (20).
5. Tankentlüftungsanlage nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Maximaldurchfluss des ansteuerbaren Absperrmittels (90) mindestens so groß ist wie der Maximaldurchfluss des Tankentlüftungsventils (30).5. Tank ventilation system according to one of claims 1 to 4, characterized in that the maximum flow rate of the controllable shut-off means (90) is at least as large as the maximum flow rate of the tank ventilation valve (30).
6. Verfahren zur Ansteuerung eines Absperrmittels (90) einer Tankentlüftungsanlage gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Absperrmittel (90) bei folgenden Betriebszuständen:6. A method for controlling a shut-off means (90) of a tank ventilation system according to one of claims 1 to 5, characterized in that the shut-off means (90) in the following operating states:
- bei einer Dichtheitsprüfung oder- during a leak test or
- sowohl bei einer Dichtheitsprüfung als auch bei einem Stillstand der Brennkraftmaschine (44) oder- Both during a leak test and when the internal combustion engine (44) is at a standstill or
- sowohl bei einer Dichtheitsprüfung als auch bei laufender Brennkraftmaschine dann, wenn keine Tankentlüftung erfolgt, als auch bei einem Stillstand der Brennkraftmaschine geschlossen und in allen anderen Betriebszuständen geöffnet wird. - Both during a leak test and when the internal combustion engine is running when there is no tank ventilation, and when the internal combustion engine is at a standstill it is closed and opened in all other operating states.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2000114739 DE10014739A1 (en) | 2000-03-24 | 2000-03-24 | Tank ventilation system for a motor vehicle and method for operating such |
| DE10014739.9 | 2000-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2001073283A1 true WO2001073283A1 (en) | 2001-10-04 |
Family
ID=7636248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2001/001141 WO2001073283A1 (en) | 2000-03-24 | 2001-03-23 | Tank ventilation system for a motor vehicle and method for operating a system of this type |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE10014739A1 (en) |
| WO (1) | WO2001073283A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1361100A2 (en) * | 2002-05-10 | 2003-11-12 | Eaton Corporation | System and method for determining leakage in fuel vapor emission controls |
| US6889667B2 (en) | 2002-03-05 | 2005-05-10 | Robert Bosch Gmbh | Tank-venting system in a motor vehicle and method for checking the operability of the tank-venting system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10209432B4 (en) * | 2002-03-05 | 2004-02-19 | Robert Bosch Gmbh | Procedure for testing the function of a tank ventilation system |
| US8122758B2 (en) * | 2008-02-21 | 2012-02-28 | GM Global Technology Operations LLC | Purge valve leak diagnostic systems and methods |
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2000
- 2000-03-24 DE DE2000114739 patent/DE10014739A1/en not_active Withdrawn
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2001
- 2001-03-23 WO PCT/DE2001/001141 patent/WO2001073283A1/en active Application Filing
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6889667B2 (en) | 2002-03-05 | 2005-05-10 | Robert Bosch Gmbh | Tank-venting system in a motor vehicle and method for checking the operability of the tank-venting system |
| DE10209483B4 (en) * | 2002-03-05 | 2006-07-06 | Robert Bosch Gmbh | Method for testing the functionality of a tank ventilation system and tank ventilation systems in motor vehicles |
| EP1361100A2 (en) * | 2002-05-10 | 2003-11-12 | Eaton Corporation | System and method for determining leakage in fuel vapor emission controls |
| EP1361100A3 (en) * | 2002-05-10 | 2006-12-06 | Eaton Corporation | System and method for determining leakage in fuel vapor emission controls |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10014739A1 (en) | 2001-10-11 |
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