DE102019219937B4 - Internal combustion engine with a venturi nozzle provided in a fluid-carrying component fluidly connected to a tank ventilation line - Google Patents

Abstract

Internal combustion engine with a fuel tank (36), a tank ventilation line (38) and a venturi nozzle (30) provided in a fluid-carrying component (16), the fluid-carrying component (16) and/or the venturi nozzle (30) having an inflow channel (28), a has an outlet point (40) downstream of the inflow channel (28) with a fluid connection to the tank ventilation line (38) and an outflow channel (32) downstream of the outlet point (40), characterized in that an outflow section (48) of the Venturi nozzle ( 30) and/or the fluid-carrying component (16) downstream of the opening (40) is surrounded by the fluid-carrying component (16) in such a way that a detection space (46) is formed around the outflow section (48), the detection space (46) has at least one inflow opening (50), via which the detection space (46) is fluidly connected to the tank ventilation line (38) in such a way that the same negative pressure prevails in the detection space (46) as in the tank ventilation line (38), and wherein at least one pressure sensor (76, 86) is provided for monitoring the pressure in the detection space (46).

Description

The invention relates to an internal combustion engine with at least one venturi nozzle provided in a fluid-carrying component according to the preamble of claim 1.

Out of DE 10 2011 084 539 B3 a turbocharger with a compressor is known, the compressor having a low-pressure inlet area connected to a low-pressure side of an intake manifold and a high-pressure outlet area connected to a high-pressure side of the intake manifold. The turbocharger has a Venturi nozzle, which is arranged between the low-pressure inlet area and the high-pressure outlet area. Furthermore, the Venturi nozzle is connected to an activated charcoal filter in a tank ventilation line, so that the activated charcoal filter is vented or regenerated. The venturi nozzle can be integrated into the housing of the compressor or attached to it. This document does not contain any details on the integration or attachment of the Venturi nozzle to the compressor housing.

Out of DE 41 24 465 A1 a tank ventilation system and a method and a device for testing the functionality of such a tank ventilation system are known. The device has a pressure connection with which the tank can be pressurized, with the pressure in the tank being able to be checked via a pressure sensor. The document essentially relates to the areas of the tank, a tank connection line and an absorption filter. The document does not describe a Venturi nozzle or the possibility of detecting a leak in the area where tank gases are introduced into an intake manifold.

Out of U.S. 5,918,580 A a tank ventilation system is known which has a tank ventilation line which opens into an intake manifold and includes an absorption filter. The document primarily concerns the delivery of tank gases in the direction of the intake manifold. Details on the arrangement of a Venturi nozzle in the area of the intake manifold cannot be found in the document.

Out of WO 2019/195 564 A1 a tank ventilation system is known which has a fluid-carrying component which is connected to a tank, a turbocharger and an intake manifold so that it can flow through, the intake manifold leading to an engine. The fluid-carrying component is connected to the turbocharger and the intake manifold so that a flow can flow through it via an inflow opening. Furthermore, a tank ventilation line connects the tank to the fluid-carrying component. A venturi nozzle and a point at which the venturi nozzle opens out with the tank ventilation line are provided downstream of the inflow channel. Downstream of the Venturi nozzle, the fluid-carrying component has an outflow channel and a detection space, which are fluidly connected to the turbocharger. When the turbocharger is switched off, a leaky fluid connection between the fluid-carrying component and the turbocharger can be detected with the tank ventilation system.

The object of the invention is to provide an internal combustion engine according to the preamble of claim 1, by means of which it is possible to reliably prevent air containing fuel from entering the environment.

The object is achieved according to the invention with the features of claim 1. Further practical embodiments and advantages of the invention are described in connection with the dependent claims.

An internal combustion engine according to the invention comprises a fuel tank, a tank ventilation line and a venturi nozzle provided in a fluid-carrying component, the fluid-carrying component and/or the venturi nozzle having an inflow channel, an outlet point downstream of the inflow channel with a fluidic connection to the tank ventilation line and a outlet point downstream of the outlet point having subsequent outflow channel. In particular, the outflow channel opens into an intake path upstream of a compressor of an exhaust gas turbocharger. The flow of intake air through the venturi nozzle along the main flow direction from the inflow channel in the direction of the outflow channel generates a negative pressure in the tank ventilation line, which causes the fuel tank to be vented. An outflow section of the Venturi nozzle and/or the fluid-carrying component downstream of the orifice is surrounded by the fluid-carrying component in such a way that a detection space is formed around the outflow section. The detection space has at least one inflow opening, via which the detection space is fluidly connected to the tank ventilation line in such a way that the same negative pressure prevails in the detection space as in the tank ventilation line.

Furthermore, at least one pressure sensor is provided for monitoring the pressure in the detection space.

With the internal combustion engine according to the invention, it can not only be ensured that the tightness and correct installation of a point at which a tank ventilation line is introduced into a venturi element can be monitored and is thus guaranteed. The construction of the invention has moreover the advantage that the monitoring reacts very sensitively and, above all, is independent of a turbocharger type used in an internal combustion engine, in particular of its design principle. Thus, the monitoring of the point of introduction with the internal combustion engine according to the invention works just as reliably with turbochargers with variable turbine geometry as with simply constructed turbochargers that have no variability with regard to the turbine geometry.

The entire outflow channel is preferably surrounded by the detection space formed by the fluid-carrying component. Apart from the one inflow opening or several inflow openings, the detection space is preferably a closed space, i.e. a space that is suitably sealed off from other spaces that may be accessible via gaps and from the environment that may be accessible via gaps, for example by the suitable arrangement of sealing elements.

In practice, Venturi nozzles, which are used for tank venting as described above, are often arranged in components which—for example due to a component being positioned in an outstanding manner—can be damaged during repair or maintenance work. In addition, age-related and material fatigue-related damage to such components is also possible. In practice, damage in the area of the opening where the tank ventilation line opens into the Venturi nozzle can usually be detected on the activated charcoal canister, since the activated charcoal canister is not regenerated if the tank ventilation is interrupted or only insufficient. This is detected by a corresponding monitoring system. Damage to the inflow channel of the Venturi nozzle upstream of the orifice can also be detected in the same way, because in this case a vacuum is no longer generated in the tank ventilation line.

On the other hand, damage to the venturi nozzle in the area downstream of the opening is problematic, since particularly high leverage forces are at work here—especially in the case of venturi nozzles of great length downstream of the opening. Damage to the outflow section downstream of the orifice has so far not been detectable, since the amount of intake air escaping and in particular the associated pressure drop within the Venturi nozzle are very small and are therefore usually within the measurement tolerances of corresponding detection means (in particular pressure sensors). To this extent, unnoticed damage can result in fuel-containing vapors escaping into the environment over a longer period of time.

With the internal combustion engine according to the invention, damage in the outflow section can be detected reliably and independently of the design of an internal combustion engine. It can thus be ensured that no intake air containing fuel gets into the environment over a longer period of time. The arrangement of the section of the Venturi nozzle or of the Venturi element downstream of the orifice in a detection space formed by the component has two effects.

On the one hand, if only the venturi nozzle is damaged downstream of the orifice, the intake air containing fuel flows into the pressurized detection chamber and cannot escape from it into the environment.

On the other hand, this section is particularly well protected against damage by the surrounding arrangement of the section downstream of the opening point of the component of the intake section. If the venturi nozzle and the fluid-carrying component surrounding it are damaged—which is rather improbable—a pressure increase in the negative pressure caused by the escaping fluid can be easily and reliably detected by the pressure sensor.

The internal combustion engine according to the invention with a surrounding arrangement of the Venturi nozzle thus counteracts damage to the Venturi nozzle in the area of a section downstream of the orifice and also enables reliable detection if the Venturi nozzle and the fluid-carrying, surrounding component are damaged.

Damage to the Venturi nozzle is counteracted particularly well if the entire outflow section, i.e. the entire outflow channel, is surrounded by the component. The component can also be designed in such a way that the inflow channel and/or at least partially also a connecting piece to the tank ventilation line is surrounded by the component at least in part. In this case, the detection space is designed in such a way that a predominant part of the Venturi nozzle or the entire Venturi nozzle is surrounded by the component and the detection space. As a result, the Venturi nozzle is also effectively protected against external forces and damage in the relevant sections and areas.

In a practical embodiment, the fluid-carrying component is an intake scoop, an exhaust gas turbocharger or an intake scoop or an add-on element adjacent to an exhaust gas turbocharger. The intake air flowing out of the Venturi nozzle with the fuel-containing tank ventilation gases accordingly flows either via an intake scoop, which is fluidly connected to an exhaust gas turbocharger, directly into an intake path upstream of an exhaust gas turbocharger or directly into an exhaust gas turbocharger. In this case, either the intake scoop itself or the exhaust gas turbocharger are designed in particular in such a way that at least one outflow section of the Venturi nozzle is surrounded downstream of the orifice in such a way that the respective component (intake scoop or exhaust gas turbocharger or an adjacent add-on element) at least partially forms a detection space.

In a further practical embodiment of an internal combustion engine according to the invention, the Venturi nozzle and the detection chamber are at least partially provided in a Venturi element, and the fluid connection between the tank ventilation line and the detection chamber is designed as a branch channel of the tank ventilation line leading into the Venturi element. Such an embodiment is particularly compact and can be integrated into elements produced by the plastic injection molding process without great additional effort.

The initial assembly as well as maintenance and repair work on an internal combustion engine according to the invention can be carried out particularly easily and inexpensively if the add-on element has a plug-in connection to the Venturi element.

Particularly in the case of the compact construction with a branch duct, as mentioned above, it is advantageous if a non-return valve is provided in the area of the inflow section to the Venturi nozzle. In particular, a membrane can be used as a non-return valve, which in a standard position has a closed position and which can only be opened when there is pressure in one direction of flow.

A further advantage of an internal combustion engine according to the invention is that both a pressure sensor arranged in the tank ventilation line and a pressure sensor arranged in an intake manifold can serve as a pressure sensor for monitoring the detection space. Such a sensor is present at least in practically every internal combustion engine, in particular in internal combustion engines with an exhaust gas turbocharger.

If the at least one inflow opening into the detection chamber is formed at least partially in an element of the tank ventilation line that has an inflow section to the Venturi nozzle, there are practically no additional costs, especially if the design is already taken into account when designing a plastic injection mold. A branch duct can then be formed at least partially directly with the production of the element of the tank ventilation line with the inflow section, in particular in such an element in the form of a straight or angled suction connector.

It is also advantageous if the at least one inflow opening into the detection space is configured parallel to the inflow section to the Venturi nozzle, because then flow losses that occur as a result of any form of change in direction and deflection of fluids can be largely avoided.

In a further practical embodiment, the Venturi nozzle is designed in one piece or in several parts. In particular, the inflow duct, the outflow duct and a connection for the tank ventilation line can be designed as separate elements which are only connected to one another during assembly of the internal combustion engine, e.g. by plugging together and/or welding. In this case, the venturi nozzle comprises in particular a base body which is designed in one piece with the inflow channel and in which the separate inflow channel and a connection for the tank ventilation line are provided. Alternatively, the Venturi nozzle can also be designed in one piece, which simplifies manufacture and assembly.

The Venturi nozzle can also have two or more openings which are connected to the tank ventilation line in a fluid-conducting manner in order to bring about a particularly effective tank ventilation. The Venturi nozzle is narrowed in each case in the area of the outlet. If several outlet points are provided, then in particular a section of the Venturi nozzle is surrounded by the component and the detection space, which section extends downstream of the first outlet point viewed in the main flow direction.

The invention was made primarily in connection with fluid-carrying components and/or venturi nozzles in fluid-carrying components and add-on elements that are made entirely or partially of plastic. After all, plastic components in particular can become brittle after a long period of use and then suddenly fail. Such a failure can be reliably detected with the internal combustion engine according to the invention.

• 1 eine schematische Darstellung einer erfindungsgemäßen Brennkraftmaschine,
• 2 den mit II gekennzeichneten Bereich aus 1 mit einer Venturidüse und einem Detektionsraum in einer schematischen Querschnittsdarstellung,
• 3 ein Druck-Zeit-Diagramm,
• 4 eine perspektivische Ansicht einer Zusammenbaueinheit einer Ausführungsform einer erfindungsgemäßen Brennkraftmaschine mit der dazugehörigen Ansaughutze, einem daran befestigten Venturielement, in welchem eine nicht erkennbare Venturidüse angeordnet ist, und einem an dem Venturielement befestigten Saugstutzen,
• 5 eine perspektivische Ansicht der Zusammenbaueinheit aus 4 nur mit dem Venturielement und einem alternativen, damit verbundenen gewinkelten Saugstutzen,
• 6 die Ausführungsform aus 5 in einer ersten Schnittdarstellung, in welcher die Schnittebene in Hochrichtung verläuft und mittig durch die Tankentlüftungsleitung gelegt ist,
• 7 die Ausführungsform aus den 5 und 6 in einer zweiten Schnittdarstellung, in welcher die Schnittebene in Hochrichtung verläuft und mittig durch den Abzweigkanal gelegt ist und
• 8 die Ausführungsform aus den 5 bis 7 in einer Schnittdarstellung gemäß der Linie VIII-VIII in 6.

Further practical embodiments of the invention are described below in connection with the drawings. Show it:

• 1 a schematic representation of an internal combustion engine according to the invention,
• 2 the area marked II 1 with a venturi nozzle and a detection chamber in a schematic cross-sectional view,
• 3 a pressure-time diagram,
• 4 a perspective view of an assembly unit of an embodiment of an internal combustion engine according to the invention with the associated intake manifold, a venturi element attached thereto, in which a venturi nozzle that cannot be seen is arranged, and an intake connection piece attached to the venturi element,
• 5 a perspective view of the assembly unit 4 only with the venturi element and an alternative angled suction nozzle connected to it,
• 6 the embodiment 5 in a first sectional view, in which the sectional plane runs in the vertical direction and is placed centrally through the tank ventilation line,
• 7 the embodiment from the 5 and 6 in a second sectional view, in which the sectional plane runs in the vertical direction and is placed centrally through the branch duct and
• 8th the embodiment from the 5 until 7 in a sectional view according to the line VIII-VIII in 6 .

1 shows an internal combustion engine 10 according to the invention in a schematic representation, with only those elements being explained in detail below which are potentially relevant in connection with the invention.

An intake path 12 is formed as part of the internal combustion engine 10, via which fresh air can be conveyed from the atmosphere in the direction of a combustion chamber 14. An intake hood 18 is provided as a first fluid-carrying component of the intake path 12 . A compressor of an exhaust gas turbocharger 20 and a throttle valve 22 follow downstream of the intake scoop 18 . The section between the throttle valve 22 and the combustion chamber 14 is referred to as the intake manifold 88 .

The area downstream of the compressor is referred to as the pressure pipe 24 . A partial flow T branches off from the pressure pipe 24 at a junction 26 downstream of the exhaust gas turbocharger 20 , the partial flow T leading via a fluid line 96 into an inflow channel 28 of a further fluid-carrying component 16 in the form of a venturi element 92 . A venturi nozzle 30 is inserted or formed in the venturi element. An outflow channel 32 of the venturi element 92 leads back into the intake hood 18. The venturi element 92 is fluidly and directly connected to the intake hood 18 here.

Alternatively, the fluid-carrying component 16, which surrounds or provides the Venturi nozzle 30, can also be designed in one piece with the intake hood 18.

Intake air from the venturi nozzle 30 or the venturi element 92 is conducted upstream of the exhaust gas turbocharger 20 into the intake section 12 via the outflow channel 32 and the intake scoop 18 .

As in 1 As can be seen, a pressure sensor 34 is arranged in the pressure pipe 24, here downstream of the branch 26 of the partial flow T.

Exhaust gas conducted from the combustion chamber 14 flows via the exhaust gas turbocharger 20 in the direction of an exhaust system (not shown).

The internal combustion engine 10 also includes a fuel tank 36 which is vented via a tank vent line 38 . A first branch 38a of the tank ventilation line 38 leads to an opening 40 in the Venturi nozzle 30. This branch conveys fluid via the tank ventilation line 38 and the Venturi nozzle 30 into the intake section 12, particularly in turbo mode of the internal combustion engine 10. A check valve 68 is arranged immediately in front of the opening 40 , which serves to permit fluid flow toward venturi element 92 and prevent backflow in the opposite direction.

A second branch 38b of the tank ventilation line 38 leads into the area downstream of the throttle valve 22. This branch 38b delivers fluid via the tank ventilation line 38 downstream of the throttle valve 22 into the intake manifold 88, particularly when the internal combustion engine 10 is in suction mode. Another check valve 40 is arranged in the branch 38b .

In the embodiment shown, a pressure/temperature sensor 86 is arranged directly in the area of the throttle valve 22 in the intake manifold 88 . As an alternative to the position shown, such a sensor 86 can also be arranged at any other point in the intake manifold 88, i.e. between the throttle valve 22 and the combustion chamber 14.

A first pressure and temperature sensor 44, a fuel tank isolation valve (FTIV) 72, an activated charcoal canister 42, a tank leakage diagnostic module (DMTL) 74, a pressure/temperature sensor 76 and a tank ventilation valve (TEV) 78 are also arranged in the path of the tank ventilation line 38. The tank vent valve (TEV) 78 can be used as in 1 shown downstream of the pressure/temperature sensor 76 or alternatively also upstream of this pressure/temperature sensor 76.

As in 1 is also already shown schematically and is explained in detail below with reference to the other figures, the Venturi nozzle 30 is at least partially of a - in 1 only shown as a dashed box - detection space 46 surrounded.

2 shows the Venturi nozzle 30 and the fluid-carrying component 16 in a simplified sectional view. The Venturi nozzle 30 has the inflow channel 28 on the right-hand side and the outflow channel 32 on the left-hand side. The tank ventilation line 38 opens out from above at the opening point 40.

One of the tank ventilation line 38 (cf. 1 ) The branched-off partial flow flows into the inflow channel 28 and further in the main flow direction through the Venturi nozzle 30 in the direction of the outflow section 48 of the outflow channel 32. Due to the geometric design, a vacuum is generated in the tank ventilation line 38 in the area of the opening point 40 of the tank ventilation line 38 during turbo operation of the internal combustion engine 10, so that gases containing fuel are then actively conveyed out of the fuel tank 36 or out of the activated charcoal canister 42 via the branch 38a of the tank ventilation line 38 . These gases then flow via the outflow channel 32 upstream of the exhaust gas turbocharger 20 into the intake section 12 (cf. 1 ).

In the representation according to 2 Almost the entire outflow channel 32, almost the entire inflow channel 28 and part of the tank ventilation line 38 up to the outlet point 40 are surrounded by a housing section of the fluid-carrying component 16 as a section downstream of the outlet point 40 in such a way that a detection chamber 46 enclosing these areas is formed.

In the present case, the detection space 46 has an inflow opening 50 via which the detection space 46 is fluidly connected to the tank ventilation line 38 , in particular to the branch 38b of the tank ventilation line 38 . Therefore, the same negative pressure prevails in this detection space 46 as in the tank ventilation line 38. The sealing of the detection space 46 in relation to the tank ventilation line 38 and in relation to the outflow channel 32 takes place here via O-rings 52 Way done (not shown), if such a seal is structurally necessary and / or useful.

As in 2 in synopsis with the 4 until 8th is clearly visible, the gases from the branch 38b of the tank ventilation line 38 are also conducted into the detection chamber 46 via the inflow opening 50 . In the detection chamber 46 and in the tank ventilation line 38, the same negative pressure is therefore established.

In connection with the diagram in 3 the functional principle of the internal combustion engine 10 according to the invention is explained below. The pressure in the detection space 46 is monitored by means of the pressure/temperature sensor 76 and/or alternatively or in addition to the pressure/temperature sensor 86 . The solid line 54 in 3 represents the negative pressure which prevails in the detection chamber 46 and thus also in the tank ventilation line 38 during normal operation or during a specific, constant operating state. The two solid lines 56, 58 arranged above and below represent the measurement tolerance within which the pressure in the pressure pipe 24 can fluctuate without one of the pressure sensors 76, 86 detecting a corresponding pressure change.

Damage to the Venturi nozzle 30 downstream of the orifice 40, which causes only a slight increase in pressure in the detection chamber 46 (cf. dashed line 60 in 3 ), which is within the range of the measurement tolerance, would not be detected as critical by the pressure/temperature sensors 76 and/or 86 because the damage to the Venturi nozzle 30 only reaches the detection space 46 and not the environment.

If, on the other hand, the section downstream of the orifice 40 and also the fluid-carrying component 16 in the area of the detection space 46 are damaged, there is a significant pressure increase according to the dot-dash line 62 in 3 . This increase in pressure is outside the measuring tolerance of the pressure/temperature sensors 76 or 86 (it is sufficient if one of these pressure/temperature sensors 76, 86 is present and used for corresponding pressure monitoring), so that it is caused by at least one of these pressure / Temperature sensors 76, 86 associated evaluation unit is detectable. It can thus be prevented that intake air containing fuel, which flows out of the damaged Venturi nozzle 30 downstream of the orifice point 40, escapes unnoticed into the environment.

4 shows an embodiment of an internal combustion engine with an intake scoop 18, which is formed here from two sub-elements 90a, 90b. The intake scoop 18 is a fluid-carrying component insofar as essentially fresh air is drawn in via an intake path in the direction of the arrow F in 4 is promoted. A Venturi element 92, in which a Venturi nozzle 30 is integrated, is firmly connected to the intake hood 18 as a further fluid-carrying component 16.

Directly connected to the Venturi element 92 are a straight suction pipe 94a as an add-on element 82 and the in connection with 1 already mentioned fluid line 96.

Further details of the venturi element 92 and the suction nozzle 94a are described below in connection with FIGS 5 until 8th described. This is in the 5 until 8th Venturi element 92 shown is identical to that in 4 Venturi element 92 shown, whereas instead of the straight suction port 94a 4 in the 5 until 8th an angled suction port 94b is shown. However, the suction nozzles 94a, 94b differ only in that in the case of the straight suction nozzle 94a, the fluid is passed straight through via an inlet opening 98 opposite the outlet opening without deflection, whereas the angled suction nozzle 94b has a lateral inlet opening 98 which deflects the incoming fluid fluids required. A side of the angled suction connector 94b opposite the outlet opening is closed, here with a separate cap 100. Alternatively, this side can also be closed in one piece.

As in the sectional view of 6 As can be seen clearly, the Venturi nozzle 30 inserted into the Venturi element 92 is designed in one piece in this embodiment, but has two nozzle sections with corresponding tapers and feed line sections 102a, 102b.

On the Venturi element 92 are an inflow channel 28, a connecting piece 64 for the suction nozzle 94a, 94b and the tank ventilation line 38 to be attached thereto (cf. dashed indication in the 4 and 6 ) and an outflow channel 32 are provided.

Venturi nozzle 30 is surrounded by Venturi element 92 in such a way that a detection chamber 46 is formed around a section of outflow channel 32 and around a section of connecting piece 64 for tank ventilation line 38 . This detection space 46 is sealed off from the environment in the area of the outflow channel 32 and the connecting piece 64 by means of suitable sealing elements, here with O-rings 52 .

As an inflow opening 50 in the detection space 46 is in the 5 until 8th shown embodiment, a branch channel 84 is formed, which extends from the suction port 94b into the Venturi element 92. At a junction, an in 8th bypass flow marked with an arrow B from section 38b of tank ventilation line 38 into detection space 46, as a result of which the same negative pressure is established in detection space 46 during normal operation of the internal combustion engine as in tank ventilation line 38.

As in the 6 and 8th is clearly visible, a membrane 104 is arranged as a check valve 68 in the inflow section 80, here precisely in the transition region between the suction connection 94b and the venturi element 92, in such a way that it is pushed downwards by a fluid flow flowing from the suction connection 94b in the direction of the venturi element 92 moves and thus allows fluid flow in the direction of venturi nozzle 30, while fluid flow in the opposite direction through the membrane 104 is prevented.

An allocation table, an engine characteristic map or another suitable means of comparison is preferably used in order to be able to compare an expected negative pressure in the detection chamber with a negative pressure measured by at least one of the pressure/temperature sensors 76, 86 on the basis of a specific operating state of the internal combustion engine and thus be able to determine it , if the venturi element 92 is not correctly installed, has become detached and has been damaged in any way such that gases conveyed through the tank ventilation line 38 to the venturi element 92 could escape into the environment.

The features of the invention disclosed in the present description, in the drawings and in the claims can be essential both individually and in any combination for the realization of the invention in its various embodiments. The invention can be varied within the scope of the claims and taking into account the knowledge of the person skilled in the art.

Reference List

10

internal combustion engine

12

suction line

14

combustion chamber

16

fluid-carrying component

18

intake scoop

20

exhaust gas turbocharger

22

throttle

24

pressure pipe

26

junction

28

inflow channel

30

venturi nozzle

32

outflow channel

34

pressure sensor

36

fuel tank

38

tank vent line

38a

first branch of the tank ventilation line

38b

second branch of the tank ventilation line

40

estuary

42

activated carbon canister

44

Pressure and temperature sensor

46

detection room

48

outflow section

50

inflow opening

52

o ring

54

line

56

line

58

line

60

line

62

line

64

connecting piece

66

body

68

check valve

70

check valve

72

fuel tank isolation valve

74

Diagnostic module tank leakage

76

pressure/temperature sensor

78

tank vent valve

80

inflow section

82

add-on element

84

branch channel

86

pressure/temperature sensor

88

intake manifold

90a

part of the intake manifold

90b

part of the intake manifold

92

venturi element

94a

Suction nozzle straight

94b

Angled suction port

96

fluid line

98

entry opening

100

cap

102a

lead section

102b

lead section

104

membrane

Claims (10)

Internal combustion engine with a fuel tank (36), a tank ventilation line (38) and a venturi nozzle (30) provided in a fluid-carrying component (16), the fluid-carrying component (16) and/or the venturi nozzle (30) having an inflow channel (28), a has an outlet point (40) downstream of the inflow channel (28) with a fluid connection to the tank ventilation line (38) and an outflow channel (32) downstream of the outlet point (40), characterized in that an outflow section (48) of the Venturi nozzle ( 30) and/or the fluid-carrying component (16) downstream of the opening (40) is surrounded by the fluid-carrying component (16) in such a way that a detection space (46) is formed around the outflow section (48), the detection space (46) has at least one inflow opening (50), via which the detection space (46) is fluidly connected to the tank ventilation line (38) in such a way that the same negative pressure prevails in the detection space (46) as in the tank ventilation line (38), and wherein at least one pressure sensor (76, 86) is provided for monitoring the pressure in the detection space (46). Internal combustion engine according to the preceding claim, characterized in that the inflow channel (28) and/or a connecting piece (64) to the tank ventilation line (38) are at least partially surrounded by the fluid-carrying component (16). Internal combustion engine according to one of the preceding claims, characterized in that the fluid-carrying component (16) is an intake scoop (18), an exhaust gas turbocharger (20) or an add-on element (82) adjoining an intake scoop (18) or an exhaust gas turbocharger (20). Internal combustion engine according to one of the preceding claims, characterized in that the Venturi nozzle (30) and the detection chamber (46) are at least partially provided in a Venturi element (92) and the fluid connection between the tank ventilation line (38) and the Detection space (46) as a venturi element (92) leading branch channel (84) of the tank ventilation line is formed. Internal combustion engine according to claims 3 and 4 , characterized in that the add-on element (82) has a plug-in connection to the venturi element (92) and/or a check valve (68) is provided in the area of the inflow section (80) to the venturi nozzle (30). Internal combustion engine according to one of the preceding claims, characterized in that the pressure sensor (76, 86) is arranged in the tank ventilation line (38) or in an intake manifold (88). internal combustion engine claim 5 , characterized in that the at least one inflow opening (50) into the detection space (46) is formed at least partially in an element of the tank ventilation line (38) which has an inflow section (80) to the Venturi nozzle (30). Internal combustion engine according to the preceding claim, characterized in that the at least one inflow opening (50) into the detection chamber (46) is designed flow-parallel to the inflow section (80) to the Venturi nozzle (30). Internal combustion engine according to any of the preceding Claims 5 , 7 or 8th , characterized in that a connecting piece (64) is provided upstream of the inflow section (80) to the Venturi nozzle (30). Internal combustion engine according to one of the preceding claims, characterized in that the Venturi nozzle (30) is constructed in one piece or in several parts and/or the fluid-carrying component (16) is made entirely or partially of plastic.

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