DE102016210570A1 - Tank ventilation module and internal combustion engine with such module - Google Patents

Abstract

The invention relates to a tank ventilation module, comprising a tank venting valve (2), a first line (3) which leaves from the tank venting valve (2) and is adapted to be connected to a suction pipe, a first check valve (5) which is in the first line (3) is arranged, a second line (4), which branches off from the first line (3) in a region between the tank vent valve (2) and the first check valve (5), a second check valve (6) which in the second A housing (7) having an opening (70) which is adapted to establish a connection with the suction pipe, a venturi nozzle (8) with a feed region (80), a discharge region (81) and a suction region (82). , wherein the second line (4), starting from the first line (3) leads to the suction region (82) of the venturi nozzle (8) and continues from the discharge region (81) of the Venturi nozzle, the supply region (80) of the Venturi nozzle (8) f r is a compound having the suction tube arranged and wherein the first check valve (5), the second check valve (6) and the tank ventilation valve (2) in the housing (7) are arranged.

Description

State of the art

The present invention relates to a tank ventilation module and an internal combustion engine with such a tank ventilation module.

Fuel vaporized in a fuel tank must not be released into the environment to protect the environment. Here it is known to provide a tank ventilation system in which the evaporating fuel is collected in an activated carbon filter. Since the activated carbon filter has only a certain storage capacity, a rinsing of the activated carbon filter with fresh air must be carried out at regular intervals. This hydrocarbon-enriched scavenging air is then usually fed to a combustion process in an internal combustion engine. Such a tank ventilation system is for example from the DE 102013221797 A1 known. However, this structure is relatively complicated and expensive. It would therefore be desirable to have a tank ventilation system, which allows safe tank ventilation and is particularly cost-effective and compact.

Disclosure of the invention

The tank ventilation module with the features of claim 1 has the advantage over that a simple and inexpensive construction is possible. The tank ventilation module according to the invention is very robust and physically small. As a result, use in vehicles is possible in particular. Furthermore, according to the invention a number of interfaces can be minimized. This is inventively achieved in that the tank ventilation module comprises a tank venting valve and a first and second check valve. The first check valve is disposed in a first conduit, which is remote from the tank vent valve and configured to lead to a suction pipe, and the second check valve is disposed in a second conduit, which is from the first conduit at a portion of the first conduit between the tank ventilation module and branches off the first check valve. Further, the tank ventilation module comprises a housing having an opening which is adapted to be connected to a suction pipe of an internal combustion engine. The tank ventilation module further comprises a Venturi nozzle having a supply area, a discharge area and a suction area. The second line opens, starting from the first line in the intake of the Venturi and is continued by the discharge area of the venturi. The supply area of the Venturi nozzle is arranged to be connected to the intake manifold. For a compact arrangement, the tank venting valve and the first and second check valves are arranged in the housing of the tank ventilation module. Due to the module according to the invention, evaporation emissions can be further reduced since any leaks occurring at interfaces can be fed directly to the intake manifold and can not escape into the environment. Furthermore, an installation effort for tank ventilation system can be reduced.

The dependent claims show preferred developments of the invention.

For a particularly compact construction, the venturi nozzle is preferably also arranged in the housing.

More preferably, the second conduit is led out of the housing in the flow direction to the discharge region of the Venturi nozzle. This makes it possible for the discharge area of the Venturi nozzle to be arranged to be connected to a first region of the intake pipe, wherein the first region of the intake pipe in the direction of flow in the intake pipe in front of a throttle valve and in particular in front of a charging device, e.g. a turbocharger or a compressor.

More preferably, the supply region of the Venturi nozzle is connected to a line start, which is arranged in the housing. Thus, medium from the inside of the housing, which is connected to the suction pipe, sucked through the venturi. The housing is particularly preferably connected to a second region of the suction tube, which lies in the flow direction after a charging device. As a result, safe operation of the Venturi nozzle can be made possible.

More preferably, the second check valve is arranged in the second line in the direction of flow of the second line to the venturi, that is, downstream of the Venturidüse discharge area.

More preferably, the second check valve is arranged in the second line between the first conduit and the suction region of the Venturi nozzle.

More preferably, the first line is led out of the housing. This makes it possible that the supply area of the venturi is connected in a simple manner with a suction tube. In this case, the supply region of the Venturi nozzle is particularly preferably connected to a region of the suction tube which is arranged downstream of a charging device in the direction of flow in the suction tube.

Preferably, the second check valve is arranged in the second line in the flow direction in the second line after the Venturi nozzle. Alternatively, the second check valve is disposed in the second conduit between the first conduit and the suction region of the venturi. In the first alternative, in particular, operation of the Venturi nozzle is prevented when the second check valve is closed.

In order to enable the fastest possible response of the tank ventilation module, the discharge region of the venturi nozzle is preferably set up to be connected to a region of the suction tube upstream of the charging device.

In order to be able to reliably detect a leakage in the second line, a pressure sensor is preferably provided, which is arranged on the second line in order to detect possible pressure changes, which could occur due to a leak in the region of the second line.

Furthermore, the present invention relates to an internal combustion engine, comprising a tank ventilation module according to the invention.

Preferably, the internal combustion engine further comprises a suction pipe and a charging device, in particular a turbocharger and / or a compressor. Particularly preferably, the tank ventilation module is arranged directly on the intake manifold. As a result, a particularly space-saving design is possible. Particularly preferably, the suction tube has an opening, against which the opening of the housing rests and the housing is fixed to the suction tube. By using the tank ventilation module, a very compact construction for tank ventilation of the internal combustion engine can be ensured.

According to a further preferred embodiment of the invention, the first line of the tank ventilation module opens at the second region of the suction pipe, which lies in the flow direction in the suction pipe after the charging device.

According to a preferred alternative, the tank ventilation module is arranged on a pressure region of the intake pipe downstream of the charging device, in particular downstream of a throttle flap. Alternatively, the tank ventilation module is arranged on a suction region of the suction pipe in front of the charging device.

A further alternative provides that the tank ventilation module is arranged in an intermediate region of the intake manifold between the charging device and a throttle valve in the intake manifold.

The three alternative arrangement possibilities of the tank ventilation module on the intake manifold allow an adaptation of the tank ventilation module to different strategies for tank ventilation.

More preferably, an opening of the housing of the tank ventilation module is the same size as a suction pipe opening in the suction pipe, in which the housing is arranged. This allows the tank ventilation module to be optimally attached to the intake manifold.

More preferably, the second line of the tank ventilation module is provided such that the second line opens at a first region of the suction tube, wherein the first region of the suction tube in the flow direction in the suction pipe in front of the charging device.

Alternatively, the second line of the tank ventilation module is provided such that the second line opens in the housing. Furthermore, in this case, a line start, which is connected to the supply region of the Venturi nozzle, starting from a second region of the suction pipe, wherein the second region of the suction pipe in the flow direction in the suction pipe after the charging device.

The tank ventilation module is preferably connected via a first interface on the first line to a filter device, in particular an activated carbon filter. The filter device is connected to a tank.

More preferably, a control unit is provided, which is connected to the tank ventilation module in order to open and close it. The control unit is set up to control a purging of the filter device as a function of operating modes of the internal combustion engine.

Furthermore, the present invention relates to a vehicle with an internal combustion engine with inventive tank ventilation module.

drawing

Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:

1 a schematic view of a tank ventilation module according to a first embodiment, when there is a negative pressure at a free end of the first conduit;

2 a schematic view of the tank ventilation module of 1 if at the free end of the first line there is an overpressure;

3 a schematic view of a tank ventilation module according to a second embodiment, when there is a negative pressure at a free end of the first conduit;

4 a schematic view of the tank ventilation module of 3 if at the free end of the first line there is an overpressure;

5 a schematic view of a tank ventilation module according to a third embodiment, when there is a negative pressure at a free end of the first conduit; and

6 a schematic view of the tank ventilation module of 5 , if at the free end of the first line there is an overpressure.

Preferred embodiments of the invention

The following is with reference to the 1 and 2 a tank ventilation module 1 according to a first preferred embodiment of the invention described in detail.

How out 1 can be seen, includes the tank ventilation module 1 a tank vent valve 2 , a first check valve 5 and a second check valve 6 , The tank vent valve 2 , the first check valve 5 and the second check valve 6 are in a case 7 arranged.

The tank vent valve 2 is over a first line 3 with the first check valve 5 connected. A free end 30 the first line 3 , is characterized by a suction tube 10 connected.

The housing 7 includes an opening 70 , which at a same size intake opening 17 is arranged in the suction pipe. Thus, the interior of the housing forms 7 a part of the suction tube, wherein the arrangement laterally on the suction pipe, a flow in the suction pipe is only minimally affected.

The tank ventilation module 1 further comprises a second conduit 4 which, how, out 1 can be seen from a region of the first line 3 between the tank inlet valve 2 and the first check valve 5 branches.

The second line 4 leads to a Venturi nozzle 8th and flows into the intake manifold 4 , How out 1 can be seen, the Venturi nozzle 8th a feed area 80 , a discharge area 81 and a suction area 82 on.

The second line 4 is doing so with the Venturi nozzle 8th connected to that second line 4 in the intake area 82 flows and from the discharge area 81 to the intake manifold 10 continues. It is in the section of the second line 4 in the flow direction after the Venturi nozzle 8th the second check valve 6 arranged. How out 1 is apparent, opens the second line 4 in a first area 101 the suction pipe in front of a charging device 15 , A second area of the suction pipe after the charging device 15 is with the reference numeral 102 designated. In this embodiment, the charging device is a turbocharger. In the intake manifold is still a throttle 16 arranged.

Furthermore, on the second line 4 a first pressure sensor 13 intended. A second pressure sensor 14 is in a supply line 19 to the tank ventilation valve 2 intended.

In the 1 and 2 is also a tank 11 shown schematically, in which a fuel is stored. The Tank 11 is with a filter device 12 , eg an activated carbon filter. From the filter device 12 then leads the supply line 19 to the tank ventilation valve 2 ,

The 1 and 2 now set different operating states of an internal combustion engine 20 to which the suction tube 10 leads, dar.

At the in 1 the condition shown is in the second area 102 the suction pipe a negative pressure. This opens the first check valve 5 , so now a rinse of the filter device 12 becomes possible. A control unit controls this 18 the tank vent valve 2 in an open state. This is a purge of the filter device 12 possible with fresh air, so that hydrocarbons, which during, for example, an inactivity of the internal combustion engine in the filter device 12 have been stored from the filter device 12 can be removed. By the second area 102 The negative pressure prevailing in the intake manifold now arises as in 1 indicated by the arrows A, a flow from the tank 11 or from the filter device 12 over the opened tank ventilation valve 2 in the first line 3 , The negative pressure opens the first check valve 5 so that the fuel vapors through the open check valve 5 from the free end 30 the first line 3 can escape and into the intake manifold 10 reach. The flow in the intake manifold is indicated by the arrows C.

The in 1 described state, for example, in an intake phase of the internal combustion engine 20 present at the beginning of a suction phase and / or at the end of a suction phase and / or in a phase in which the charging device 15 not operated.

2 now shows a state in which in the second area 102 of the suction pipe 10 a high pressure prevails. This pressure is achieved by operating (arrow E) the charging device 15 generated (s. 2 ). If a tank venting is to take place in this operating state, in turn, the tank vent valve 2 open. Due to the high pressure in the second area 102 of the suction pipe 4 however, remains the first check valve 5 closed. Because the pressure in the second area 102 larger than in the first area 101 of the suction pipe, there is a flow through the venturi 8th , as in 2 indicated by the arrows D. At the same time, medium flows into a start of the line 40 in the Venturi nozzle 8th , This will be at the intake 82 the Venturi nozzle 8th creates a vacuum, so that the over the open tank vent valve 2 leaking fuel vapors to the intake 82 be sucked.

Due to the pressure difference between the second area 102 and the first area 101 the suction pipe also opens the second check valve 6 so that the vapors share with parts of the second area 102 of the suction tube under pressure medium via the Venturi nozzle 8th and the opened second check valve 6 to the first area 101 the suction tube can be returned. From there, by operating the charging device 15 this mixture then to the internal combustion engine 20 promoted (arrows C).

To meet the highest environmental standards, are two pressure sensors, namely the first pressure sensor 13 in the second line 4 and the second pressure sensor 14 in the supply line 19 from the filter device 12 to the tank inlet valve 2 intended. The control unit 18 become the pressure values of the first and second pressure sensors 13 . 14 supplied, so that monitoring of the pressure values can be performed. If the control unit 18 This determines deviations from predetermined pressure values, it can be easily determined that the tank vent valve 2 remains closed and no rinsing of the filter device takes place.

In the first embodiment, the first pressure sensor 13 for diagnostic purposes on the second line 4 arranged to determine if a leak in the second line 4 is present, from which hydrocarbon-containing gases could escape into the environment.

By training as a module, the tank ventilation module 1 quick and easy to the intake manifold opening 17 be flanged. This ensures a particularly compact design. Furthermore, by the arrangement of the tank ventilation valve 2 the first and second check valves 5 . 6 within the inner tube connected to the intake manifold 7 Ensure that, if there are leaks at these components or at interfaces of these components to duct areas, the hydrocarbon-containing vapors escape directly into the intake manifold and not into the environment. Here, the undesirable by damage or the like. Exiting hydrocarbons then simply to the engine 20 be fed and burned there. As the tank ventilation module 1 laterally on the intake manifold 10 is arranged, the flow conditions in the intake manifold are not adversely affected. The integration of the tank ventilation module 2 in the suction pipe 4 thus allows a reduction in complexity of the tank ventilation system.

The 3 and 4 show a tank ventilation module 1 according to a second embodiment of the invention, wherein identical or functionally identical parts are designated by the same reference numerals.

How out 3 it can be seen, in the second embodiment, the arrangement of the housing 7 at the intake manifold 10 differently. As in 3 shown is the case 7 with the opening 70 arranged on the suction pipe, that the Saugrohröffnung 17 of the suction pipe in a third area 103 the suction pipe between the charging device 15 and the throttle 16 is arranged. The first line 3 flows into the second area 102 of the intake manifold in the flow direction in the intake manifold after the throttle valve 16 , The second line 4 flows into the first area 101 of the suction pipe in the flow direction in front of the charging device 15 , 3 again shows the state in which in the second area 102 the suction pipe is under negative pressure. In this case, then, as in the first embodiment, a venting or flushing of the filter device 12 over the opened tank ventilation valve 2 and the opened first check valve 5 possible, as indicated by the arrows B.

4 shows the state of the second embodiment, in which in the second area 102 the suction pipe, a pressure level above the pressure in the flow direction before the first check valve 5 in the first line 3 prevails. Here is the first check valve 5 then closed and the second check valve 6 is by operating the venturi, as in 4 indicated by the arrows D, opened. Thus, hydrocarbon-containing vapors or the like. Via the open tank vent valve 2 and the opened second check valve 6 in the Venturi nozzle 8th and from there via the second line 4 to the first area 101 guided the suction tube. Thus, also becomes one Tank ventilation in different operating states of the internal combustion engine possible.

The 5 and 6 show a tank ventilation module 1 according to a third embodiment of the invention, again with identical or functionally identical parts are denoted by the same reference numerals.

How out 5 it can be seen, in the third embodiment, the tank ventilation module 1 at the first area 101 the suction pipe in the flow direction in the suction pipe in front of the charging device 15 arranged. Thus, the opening leads 70 of the housing 7 directly in the first area 101 of the suction pipe. As in the previous embodiments, at a negative pressure in the second region 102 of the suction pipe, a tank ventilation via the open tank ventilation valve 2 and the opened first check valve 5 and the first line 3 executed. The first line 3 flows directly into the second area 102 of the suction pipe. If now in the second area 102 by operating the charging device 15 (Arrow E) there is a higher pressure closes the first check valve 5 in the first line 3 , How out 5 and 6 is apparent, is the second line 4 starting from the second line beginning 40 from the second area 102 arranged outgoing from the suction pipe and passes over the Venturi nozzle 8th to the interior of the housing 7 , Thus, pressurized medium, as in 6 indicated by the arrows D, from the second area 102 of the suction pipe via the second line 4 and the venturi 8th to a free end 41 the second line 4 guided. This in turn creates a negative pressure at the intake 82 the Venturi nozzle 8th , so that carbonaceous gases through the open tank inlet valve 2 and the opened second check valve 6 in the interior of the case 7 can flow. From there, the mixture can then be in the first area 101 of the suction pipe in the flow direction in front of the charging device 15 flow and by operating the charging device 15 to the internal combustion engine 20 be encouraged.

Furthermore, in the third embodiment, only one pressure sensor 14 necessary, which in the supply line to the tank ventilation valve 2 is arranged. In this case, the necessary diagnosis with regard to a possible leakage in the tank ventilation system can be carried out with this one pressure sensor. If, for example, in the operating state of 6 a damage in the second line 4 would be present, would simply be the second area 102 originating air flow leak into the atmosphere without this carbon could escape from the tank ventilation system. Should be in the in 5 state shown damage the first line 3 would be present due to the second area 102 the vacuum prevailing vacuum pressure ambient air through the leak in the second line 3 sucked and also no hydrocarbon-containing vapors escape into the atmosphere.

As can be seen from all described embodiments, a tank ventilation system can thus be proposed according to the invention, which is constructed as a module. In this case, a minimum number of interfaces of the tank ventilation module 1 to be allowed outside. Thus, a risk of contamination of the environment by carbonaceous medium is significantly reduced. By the arrangement of the main components of the tank ventilation module, namely the tank ventilation valve 2 and the first and second check valves 5 . 6 , in the housing 7 , any leaks occurring at interfaces to these components or to the components themselves are not critical, since the hydrocarbon-containing gases exiting there then pass directly into the intake manifold via the housing, from where they can then be transported away to the internal combustion engine, and not into the environment reach.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013221797 A1 [0002]

Claims (15)

Tank ventilation module, comprising: - a tank ventilation valve ( 2 ), - a first line ( 3 ), which from the tank ventilation valve ( 2 ) and is adapted to be connected to a suction pipe, - a first check valve ( 5 ), which in the first line ( 3 ), - a second line ( 4 ), which from the first line ( 3 ) in an area between the tank venting valve ( 2 ) and the first check valve ( 5 ), - a second check valve ( 6 ), which is arranged in the second line, - a housing ( 7 ) with an opening ( 70 ), which is adapted to establish a connection with the intake manifold, - a Venturi nozzle ( 8th ) with a feed area ( 80 ), a discharge area ( 81 ) and a suction area ( 82 ), - wherein the second line ( 4 ) starting from the first line ( 3 ) to the intake area ( 82 ) of the Venturi nozzle ( 8th ) and the discharge area ( 81 ) of the Venturi nozzle continues, - the supply area ( 80 ) of the Venturi nozzle ( 8th ) is arranged for connection to the suction pipe, and - wherein the first check valve ( 5 ), the second check valve ( 6 ) and the tank venting valve ( 2 ) in the housing ( 7 ) are arranged. Module according to claim 1, wherein the venturi ( 8th ) is arranged in the housing. Module according to claim 1 or 2, wherein the second line ( 4 ) in the flow direction after the discharge area ( 81 ) of the Venturi nozzle ( 8th ) out of the housing ( 7 ) is led out. Module according to one of the preceding claims, wherein the supply area ( 80 ) of the Venturi nozzle with a line start ( 40 ), which in the housing ( 70 ) is arranged. Module according to one of the preceding claims, wherein the first line ( 3 ) out of the housing ( 7 ) is led out. Module according to one of the preceding claims, wherein the second check valve ( 6 ) in the second line ( 4 ) in the flow direction in the second line after the venturi ( 8th ) is arranged. Module according to one of claims 1 to 6, wherein the second check valve ( 6 ) in the second line ( 4 ) between the first line ( 3 ) and the intake area ( 82 ) of the Venturi nozzle is arranged. Module according to one of the preceding claims, further comprising a pressure sensor ( 13 ), which on the second line ( 4 ) is arranged. Internal combustion engine, comprising a tank ventilation module ( 1 ) according to any one of the preceding claims. Internal combustion engine according to claim 9, characterized in that the tank ventilation module ( 1 ) directly on a suction pipe ( 10 ) is arranged. Internal combustion engine according to one of claims 9 or 10, wherein the tank ventilation module ( 1 ) at a first area ( 101 ) of the suction pipe in the flow direction in the suction pipe after a charging device ( 15 ) and in particular after a throttle valve is arranged, or that the tank ventilation module ( 1 ) in a second area ( 102 ) in the flow direction of the suction tube in front of the charging device ( 15 ), or that the tank ventilation module ( 1 ) in a third area ( 103 ) of the suction pipe in the flow direction in the suction pipe between the charging device ( 15 ) and a throttle valve ( 16 ) is arranged. Internal combustion engine according to one of claims 9 to 11, wherein an opening ( 70 ) in the housing ( 7 ) of the tank ventilation module ( 1 ) is the same size as a suction pipe opening ( 17 ) in the intake manifold ( 10 ), on which the housing ( 7 ) is arranged. Internal combustion engine according to one of claims 9 to 12, wherein the second conduit ( 4 ) at a first area ( 101 ) of the suction pipe, wherein the first region ( 101 ) in the flow direction in the suction pipe in front of the charging device ( 15 ) lies. Internal combustion engine according to one of claims 9 to 12, wherein the second conduit ( 4 ) in the housing ( 7 ) and a beginning ( 40 ), which with the supply area ( 80 ) of the Venturi nozzle, from a second area ( 102 ) of the suction tube, the second region ( 102 ) in the flow direction in the suction pipe after the charging device ( 15 ) lies. Internal combustion engine according to one of claims 9 to 14, wherein the first line ( 3 ) on the second area ( 102 ) of the suction pipe opens.

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