DE102017218302A1 - Valve means for controlling an exhaust gas flow - Google Patents

Abstract

A valve device is provided for controlling an exhaust gas flow in a flow arrangement in the exhaust tract of an internal combustion engine of a motor vehicle, wherein in the flow arrangement a first flow path through the valve device with at least one second flow path and at least one third flow path is fluid, and two valve plates of the valve device in dependence can be moved relative to each other from the exhaust gas temperature, so that the flow of the exhaust gas from the first to the second and third flow paths can be controlled.

Description

The invention relates to a valve device having at least two valve plates which have openings through which fluid connections between a plurality of flow paths in an exhaust gas tract of an internal combustion engine can be provided in a specific position.

In order to reduce the amount of nitrogen oxide in the exhaust gas of modern internal combustion engines exhaust gas aftertreatment devices such as lean NOx trap (LNT) and selective catalytic reduction (SCR) catalysts are often used. When using LNT, the known problem is that they only function effectively within a certain temperature window, i. The conversion of nitrogen works efficiently. When a certain temperature is exceeded (i.e., the maximum operating temperature of the LNT), the LNT becomes ineffective and may be subject to premature thermal aging to the LNT, impairing its catalytic function. It is useful in these temperature ranges to use for the reduction of nitrogen oxides equal to a SCR that works more effective than a LNT above a certain temperature.

Thus, there is the task of controlling the exhaust gas flow in the exhaust gas tract as a function of the temperature of the exhaust gas.

This object is achieved by a valve device with the features of claim 1. Further advantageous embodiments and embodiments of the invention will become apparent from the dependent claims and claims, the figures and the embodiments.

A first aspect of the invention relates to a valve device for controlling an exhaust flow in a flow arrangement in the exhaust tract of an internal combustion engine of a motor vehicle, wherein in the flow arrangement, a first flow path through the valve means with at least one second flow path and at least one third flow path is fluidly connectable, wherein the flow paths are cylindrical are formed and the second flow path is arranged in the radial direction outside of the third flow path. In this case, the controllable valve device has at least one first valve plate in the form of a round disc with at least one inner region and at least one outer region adjoining the inner region in the radial direction, the inner and outer regions each having at least one opening, and the openings of the inner and outer regions are arranged offset from one another. Furthermore, the controllable valve device has at least one second valve plate in the form of a round disc with at least one inner region and at least one outer region adjoining the inner region in the radial direction, the inner and outer regions each having at least one opening, and the openings of the inner and outer regions are not offset from one another. Furthermore, the openings of the first valve plate and the corresponding openings of the second valve plate have the same size. Furthermore, the first and second valve plate are movable relative to each other in the rotational direction.

The valve device accordingly has a first flow path which divides into two flow paths, and wherein the flow of a fluid from the first flow path into the second and / or third flow path through the valve device is controllable.

The invention is advantageous because it provides a means for controlling the flow of exhaust gas, which enables efficient use of the temperature of the exhaust gas. Furthermore, it is advantageous that the valve device can be arranged in a space-economical manner. It is also advantageous that the valve plates can be adjusted to each other with little energy expenditure, since the necessary rotation can be mutually small. In addition, the valve device is inexpensive to produce economically.

The term flow path refers to a device through which a fluid can flow. According to the arrangement in the exhaust tract are to be understood as a flow path especially the exhaust system or exhaust pipes. The term flow arrangement denotes an arrangement of a plurality of flow paths.

With respect to the openings in different areas of the pane, the term "staggered" means that the openings are not in alignment. In other words, the openings of the inner area are arranged at a different angle from the center of a circular area of the disk-shaped device than the openings of the outer area. If the openings are not staggered, they are in alignment.

Preferably, the valve plates in the inner and outer regions each have a plurality of openings which are equidistant from one another. The mutually corresponding openings of the two valve plates are, as described above, the same size, wherein the openings in the valve plates may have different sizes to each other.

Preferably, in the valve device in a first mode of operation, the valve plates are adjusted so that the openings in the outer region of the valve plates at least partially overlap each other and in a second mode of operation of the valve means the valve plates are adjusted so that the openings in the inner region of the valve plates at least partially overlap. In this way, it is advantageously effected that in the first operating mode, exhaust gas is passed from the first into the second flow path and in the second operating mode exhaust gas is passed from the first into the third flow path. In the case of overlapping of the openings in the inner area, the openings in the outer area are preferably closed, and in the case of overlapping of the openings in the outer area, the openings in the inner area are preferably closed. It is therefore particularly preferred if, in the first working mode, the valve plates are adjusted such that the openings of the outer regions of the two valve plates are flush with each other and the openings of the inner regions close each other, and in the second working mode, the valve plates are adjusted so that the Openings of the inner regions are flush with each other and the openings of the outer regions close each other.

It is also possible and also preferred if in the valve device in a third working mode, the valve plates are adjusted so that the openings in the inner region and in the outer region overlap each other. In this mode, exhaust gas is directed from the first flowpath in both the second and third flowpaths. This is advantageous in situations in which only a portion of the exhaust gas is needed for temperature control in the second and / or third flow path.

Preferably, at least one valve plate is connected to an actuator in the valve device. This makes it possible to adjust the valve plate in question. Particularly preferably, the actuator can be activated as a function of the temperature of the exhaust gas in order to adjust the valve plate in the direction of rotation by a predetermined angle. This advantageously makes it possible, when a certain temperature of the exhaust gas is reached, which is too high for a device in the second flow path, that the exhaust gas can be passed past it via the third flow path. The actuator does not have to move the valve plate to be adjusted by a great distance, since with a sufficiently large number of holes in the valve plates already an adjustment of the corresponding valve plate is sufficient by a few degrees.

A second aspect of the invention relates to a flow arrangement with a valve device according to the invention, wherein the first flow path of an exhaust pipe, the second flow path of an exhaust aftertreatment device and the third flow path are associated with a bypass of the exhaust gas aftertreatment device.

A third aspect of the invention relates to a motor vehicle with a valve device according to the invention.

• - Bereitstellen der Ventileinrichtung, wobei die erste Ventilplatte unbeweglich in einem ersten Strömungsweg angeordnet ist und die zweite Ventilplatte relativ zur ersten Ventilplatte in Rotationsrichtung beweglich angeordnet ist, wobei die äußeren Bereiche der Ventilplatten einem zweiten Strömungsweg und die inneren Bereiche der Ventilplatten einem dritten Strömungsweg zugeordnet sind,
• - Betreiben der Ventileinrichtung in einem ersten Arbeitsmodus, bei dem die erste und zweite Ventilplatte derart zueinander angeordnet sind, dass die Öffnungen der äußeren Bereiche der beiden Ventilplatten einander mindestens teilweise überlappen und die Öffnungen der inneren Bereiche der beiden Ventilplatten durch nichtdurchlässige Abschnitte der jeweils anderen Ventilplatte abgedeckt werden, solange die Abgastemperatur unterhalb eines vorgegebenen Schwellenwertes liegt,
• - bei Erreichen des Schwellenwertes der Abgastemperatur Aktivieren des Aktuators, der die zweite Ventilplatte für einen zweiten Arbeitsmodus der Ventileinrichtung um einen bestimmten Winkel verstellt, so dass die Öffnungen der äußeren Bereiche der beiden Ventilplatten durch nichtdurchlässige Abschnitte der jeweils anderen Ventilplatte abgedeckt werden und die Öffnungen der inneren Bereiche einander mindestens teilweise überlappen,
• - Aktivieren des Aktuators, um wieder den ersten Arbeitsmodus einzustellen, wenn der Schwellenwert wieder unterschritten wird.

A fourth aspect of the invention relates to a method for controlling an exhaust gas flow by means of a valve device according to the invention with the steps:

• Providing the valve means, wherein the first valve plate is immovably disposed in a first flow path and the second valve plate is arranged to be movable relative to the first valve plate in the rotational direction, wherein the outer regions of the valve plates are associated with a second flow path and the inner portions of the valve plates are associated with a third flow path .
• Operating the valve device in a first operating mode in which the first and second valve plates are arranged relative to one another such that the openings of the outer regions of the two valve plates at least partially overlap one another and the openings of the inner regions of the two valve plates through non-permeable sections of the respective other valve plate be covered as long as the exhaust gas temperature is below a predetermined threshold,
• - Upon reaching the threshold temperature of the exhaust gas activating the actuator, which adjusts the second valve plate for a second operating mode of the valve means by a certain angle, so that the openings of the outer regions of the two valve plates are covered by non-permeable portions of the other valve plate and the openings of the inner areas at least partially overlap each other,
• - Activation of the actuator to resume the first working mode when the threshold falls below again.

The advantages of the method according to the invention in accordance with the advantages of the valve device according to the invention. The threshold value of the temperature corresponds to an exhaust gas temperature above which an LNT can not function efficiently.

Preferably, in the method according to the invention in an additional third working mode, the first and second valve plates for regulating the temperature in the second and / or third Flow path adjusted so that the openings of the inner regions and the outer regions of the first and second valve plate partially overlap each other.

• 1 eine schematische Darstellung einer Anordnung eines Abgastrakts einer Brennkraftmaschine mit einer erfindungsgemäßen Ventileinrichtung.
• 2 eine Darstellung einer Ausführungsform einer (a) ersten Ventilplatte und (b) zweiten Ventilplatte der erfindungsgemäßen Ventileinrichtung.
• 3 eine Darstellung einer Anordnung einer Ausführungsform einer ersten Ventilplatte und zweiten Ventilplatte der erfindungsgemäßen Ventileinrichtung in einem ersten Arbeitsmodus (a) und einem zweiten Arbeitsmodus (b) in Bezug auf eine Strömungsanordnung.
• 4 eine Darstellung einer Anordnung einer ersten Ventilplatte und zweiten Ventilplatte der Ausführungsform der erfindungsgemäßen Ventileinrichtung gemäß 2 in einem ersten Arbeitsmodus (a) und einem zweiten Arbeitsmodus (b).
• 5 eine Darstellung des Verstellens der Ventilplatten gemäß 3 relativ zueinander in einen ersten Arbeitsmodus (a) und zweiten Arbeitsmodus (b) der Ventileinrichtung.
• 6 eine Darstellung des Verstellens der Ventilplatten gemäß 4 in einen ersten Arbeitsmodus (a) und zweiten Arbeitsmodus (b) der Ventileinrichtung mittels eines Aktuators.
• 7 eine Darstellung der Anordnung der Ventilplatten gemäß 4 in einem Abgastrakt in einem ersten Arbeitsmodus (a) und zweiten Arbeitsmodus (b) der Ventileinrichtung.
• 8 ein Fließdiagramm einer Ausführungsform des erfindungsgemäßen Verfahrens.

The invention will be explained in more detail with reference to FIGS. Show it:

• 1 a schematic representation of an arrangement of an exhaust tract of an internal combustion engine with a valve device according to the invention.
• 2 a representation of an embodiment of a (a) first valve plate and (b) second valve plate of the valve device according to the invention.
• 3 a representation of an arrangement of an embodiment of a first valve plate and second valve plate of the valve device according to the invention in a first operating mode (a) and a second operating mode (b) with respect to a flow arrangement.
• 4 an illustration of an arrangement of a first valve plate and second valve plate of the embodiment of the valve device according to the invention according to 2 in a first working mode (a) and a second working mode (b).
• 5 an illustration of the adjustment of the valve plates according to 3 relative to one another in a first operating mode (a) and second operating mode (b) of the valve device.
• 6 an illustration of the adjustment of the valve plates according to 4 in a first working mode (a) and second operating mode (b) of the valve device by means of an actuator.
• 7 an illustration of the arrangement of the valve plates according to 4 in an exhaust tract in a first working mode (a) and second working mode (b) of the valve device.
• 8th a flow diagram of an embodiment of the method according to the invention.

In 1 is an arrangement 1 an internal combustion engine 2 with an exhaust tract 3 with an embodiment of a flow arrangement 4 shown. The flow device 4 includes the upstream of a valve device 5 arranged part of the exhaust tract 3 as the first flow path 6 and a second flow path 7 and a third flow path 8th , The first flow path 6 meets the valve device 5 providing a fluid connection between the first flow path 6 and a second flow path 7 and a third flow path 8th controls. In other words, the first flow path divides 6 in the second 7 and the third flow path 8th , wherein the valve means 5 controls the connections between the flow paths. The second flow path 7 is around the third flow path 8th arranged around so that it limits the third flow path in the radial direction. The said flow paths are cylindrical.

In the second flow path 7 is an exhaust aftertreatment device 9 arranged. The exhaust aftertreatment device is particularly a nitrogen oxide storage catalyst 9 (LNT). The third flow path 8th is as a bypass of the second flow path 7 and with it the LNT 9 consider. Downstream of the LNT 9 become the second 7 and the third flowpath 8th again in the context of the exhaust tract 3 continued. Further downstream is a particulate filter 10 and downstream of it, a selective catalytic reduction (SCR) catalyst 11 arranged.

Especially, upstream of the valve device 5 a temperature sensor 12 arranged. Other possible, in 1 not shown facilities in the exhaust system 3 include turbines of an exhaust gas turbocharger, exhaust gas recirculation lines, other catalytic devices, supply means for reducing agents and other sensors, such as temperature sensors, pressure sensors and / or nitrogen oxide sensors.

The valve device 5 is at the upstream end of the second 7 and third flow paths 8th arranged. The valve device 5 has a first valve plate 13 and a second valve plate 14 on. The design of the two valve plates 13 . 14 is in 2 shown. Both valve plates 13 . 14 are executed around. The first valve plate 13 has an inner area 131 and an outer area 132 on. The second valve plate 14 has an inner area 141 and an outer area 142 on.

Both in the inner areas 131 . 141 as well as in the outer areas 132 and 142 the valve plates 13 . 14 is a number of equally spaced openings 15 arranged. In the in 2 illustrated embodiment of the valve device 5 the openings are elongated, ie they are longer than wide in the radial direction of the valve plates. In 2 are in the radial direction in the inner areas 131 . 141 and in the outer areas 132 . 142 one opening each 15 arranged. But there may be several openings 15 be arranged one above the other in the radial direction. It is essential in embodiments with multiple openings 15 in the radial direction, that these openings 15 in the inner or outer area are in alignment, ie are arranged directly above one another. Between the alignments in each case a certain distance in the circumferential direction between the openings is provided, which is so large that at a rotation of the valve plates 13 . 14 relative to each other openings in an alignment of a valve plate can be covered by the material of the other valve plate.

As in 2 are shown at the first valve plate 13 the openings 15 of the inner area 131 with the openings 15 of the outer area 132 staggered to each other ( 2a) , These are the openings 15 arranged offset to one another such that at a complete coincidence of the openings 15 in the outer areas 132 . 142 the openings in the inner area 131 the first valve plate 13 from the material of the inner area 141 the second valve plate 14 be covered. Accordingly, the openings 15 of the inner area 132 and the outer area 142 the second valve plate 14 not staggered to each other ( 2 B) , Also, with this arrangement, with a complete match of the openings 15 in the inner areas 131 . 141 the openings 14 in the outer area 132 the first valve plate 13 from the material of the outer area 142 the second valve plate 14 be covered. The degree of offset can be dependent on the number of circumferentially of the valve plates 13 . 14 juxtaposed openings 15 be designed. Of course, the openings can also be reversed 15 the second valve plate 14 offset and the first valve plate 13 not be offset from each other.

In a first operating mode of the valve device 5 it is envisaged that the valve plates 13 . 14 are set so that the openings of the outer areas 132 . 142 the valve plates overlap each other at least partially. Ideally, said openings overlap each other completely, ie are arranged flush over one another. At the same time, the openings in the inner area overlap 131 . 141 the valve plates 13 . 14 not each other, so that they close each other ( 3a) , In this way, exhaust gas passes through the outer regions of the valve device 5 steered and thus through the second flow path 7 ie by the LNT ( 3c) ,

In a second operating mode of the valve device 5 it is envisaged that the valve plates 13 . 14 are set so that the openings of the inner areas 131 . 141 the valve plates overlap each other at least partially. Ideally, said openings overlap each other completely, ie are arranged flush over one another. At the same time overlap the openings of the outer areas 132 . 142 the valve plates 13 . 14 not each other ( 3b) , In this way, exhaust gas is passing through the inner portions of the valve device 5 steered and thus through the third flow path 8th , ie the bypass line ( 3d) ,

In the in 3 illustrated embodiment of the valve device 5 are the openings 15 executed around. Here are both in the inner 131 . 141 as well as outer areas 132 . 142 several openings 15 in the radial direction one above the other, while in alignment, arranged. Alternatively, only one round opening could be in the radial direction 14 to be available. Furthermore, it is possible that in the inner area 131 . 141 elongated openings 14 are present and in the outer areas 132 . 142 round openings 14 , or the other way around. Also, other forms of the openings 15 possible, insofar as they are suitable for controlling the exhaust gas flow.

In the 3 (Valve plates with round openings) and 4 (Valve plates with elongated openings) is shown as the openings 15 in the outer areas 132 . 142 are arranged flush with each other, while the openings 15 in the inner areas 131 . 141 close each other ( 3a . 4a) , Upon rotation of one of the valve plates relative to the other valve plate by an angle corresponding to the degree of offset, the openings become 14 in the inner areas 131 . 141 arranged flush with each other while the openings 14 in the outer areas 132 . 142 close each other ( 3b . 4b) ,

In 5 is changing the position of the valve plates 13 . 14 represented by rotation of at least one of the valve plates relative to the other. Here is the second valve plate 14 the front, the viewer facing valve plate, while the first valve plate 13 stored behind it. The in the region of the axis of rotation of the second valve plate 14 drawn double arrow indicates the movement of the second valve plate 14 relative to the first valve plate arranged behind it 13 , The movement of the second valve plate 14 can be clockwise and counterclockwise relative to the first valve plate 13 respectively. In the example shown, the angle to which the second valve plate 14 relative to the first valve plate 13 is rotated, 9 °. Of course, the first valve plate 13 also relative to the second valve plate 14 be rotated when the second valve plate 14 firmly arranged and the first valve plate 13 is mobile. So are before turning the second valve plate 14 the openings 15 the outer areas 132 . 142 arranged one above the other and the openings 15 the inner areas 131 . 141 locked ( 5a) , and after turning the second valve plate 14 the openings 15 the outer areas 132 . 142 closed and the openings 15 the inner areas 131 . 141 open ( 5b) ,

It is provided that the first valve plate 13 is fixedly arranged in the exhaust tract, and the second valve plate 14 is arranged so that it can be rotated ( 6 ). It can be the first valve plate 13 eg by a welded connection or a screw connection in the exhaust tract 3 arranged at the entrance of the LNT. For this purpose, the first valve plate 13 For example, extensions on which the attachment of the first valve plate 13 are suitable in the exhaust system. The second valve plate 14 is eg in a guide on the outer edge with the first valve plate 14 connected. The second valve plate has an adapter 16 (highlighted by the circle) for connecting to an actuator 17 on.

Through the actuator 17 becomes the second valve plate 14 according to the requirements relative to the first valve plate 13 emotional. The actuator 17 receives its control commands from a controller 18 depending on the temperature sensor 12 determined exhaust gas temperatures, the second valve plate 14 adjusted so that the exhaust gas through the inner 131 . 141 and / or outer areas 132 . 142 the valve plates in the second and third flow path is passed. It is in 6a the adjustment of the valve plates 13 . 14 such that exhaust gas passes through the interior regions of the valve device 5 can flow, and in 6b such that exhaust gas can flow through the outer area.

In 7 is the arrangement of the valve device 5 in a flow arrangement 4 with the first 6, second 7 and third flow paths 8th shown. In the first working mode are the openings 15 opened in the outer area, so that the exhaust gas from the first 6 through the second flow path 7 is directed ( 7a) , and in the second working mode, the openings in the inner region, so that the exhaust gas from the first 6 through the third flow path 8th is directed ( 7b) ,

In another, not illustrated working mode, the openings can also be used 15 both the outer areas 132 . 142 as well as the inner areas 131 . 141 the valve plates 13 . 14 overlap each other. In this working mode, exhaust gas is through both the second flowpath 7 as well as through the third flow path 8th directed.

In one embodiment of the method according to the invention for controlling an exhaust gas flow according to 5 by means of a valve device according to the invention 5 will be in a first step S1 the order 1 with the valve device 5 provided, wherein the first valve plate 13 immovable in the first flow path 6 is arranged and the second valve plate 14 relative to the first valve plate 13 is arranged movably in the direction of rotation.

In a second step S2 becomes the valve device 5 operated in a first operating mode, wherein the first valve plate 13 and second valve plate 14 are arranged to each other such that the openings of the outer regions of the two valve plates 13 . 14 at least partially overlap each other and the openings of the inner regions of the two valve plates 13 . 14 be covered by non-permeable portions of the other valve plate, as long as the exhaust gas temperature is below a predetermined threshold. The temperature is measured by the sensor 12 recorded and sent to the controller 18 transmitted. The threshold corresponds to a temperature above that of the LTN 9 no longer works efficiently. This will exhaust from the first flow path 6 through the openings of the outer regions in the second flow path 7 and with it the LNT 9 directed.

Upon reaching said threshold value of the exhaust gas temperature is in a third step S3 after a control command from the control device 18 the actuator 17 activated, the second valve plate 14 adjusted for a second operating mode of the flow device by a certain angle, so that the openings of the outer regions of the two valve plates are covered by non-permeable portions of the respective other valve plate and the openings of the inner regions at least partially overlap. This will exhaust from the first flow path 6 through the openings of the inner regions in the third flow path 8th and thus passed through the bypass of the LNT.

If the said threshold value of the exhaust gas temperature is fallen below again, the actuator becomes 16 re-activated to the second valve plate 14 in a fourth step S4 again to adjust the certain angle back to set the first working mode again. This will lead exhaust gas back through the LNT.

In another embodiment of the method, exhaust gas may also be passed through both the second and third flow paths when the valve plates are adjusted to each other such that the openings 14 Both of the inner and the outer region overlap each other. In this case, according to a measured temperature value of the exhaust gas, the second valve plate 14 in step S3 adjusted by such an angle that exhaust gas through both in the second 7 and third flow path 8th is directed. This embodiment of the method, which corresponds to a third mode of operation, may be applied to exhaust gas of a certain temperature in addition to the first and second modes of operation as needed.

LIST OF REFERENCE NUMBERS

1

arrangement

2

Internal combustion engine

3

exhaust tract

4

flow arrangement

5

valve means

6

first flow path

7

second flow path

8th

third flow path

9

Nitrogen oxide storage catalyst

10

particulate Filter

11

Catalyst for selective catalytic reduction

12

temperature sensor

13

first valve plate

131

inner area of the first valve plate

132

outer region of the first valve plate

14

second valve plate

141

inner area of the second valve plate

142

outer region of the second valve plate

15

opening

16

adapter

17

actuator

18

control device

Claims (11)

Valve device (5) for controlling an exhaust gas flow in a flow arrangement (4) in the exhaust tract (3) of an internal combustion engine (2) of a motor vehicle, wherein in the flow arrangement (4) a first flow path (6) through the valve device (5) with at least one second Flow path (7) and at least one third flow path (8) is fluidly connectable, wherein the flow paths (6, 7, 8) are cylindrical and the second flow path (7) in the radial direction outside of the third flow path (8) is arranged wherein the valve device (5) has at least one first valve plate (13) in the form of a round disc with at least one inner region (131) and at least one outer region (132) adjoining the inner region in the radial direction, wherein the inner (131) and outer region (132) each having at least one opening (15), and the openings (15) of the inner (131) and outer region (132) are arranged offset to one another, wherein the valve device (5) has at least one second valve plate (14) in the form of a round disc with at least one inner region (141) and at least one outer region (142) adjoining the inner region in the radial direction, wherein the inner (141) and outer region (142) each have at least one opening (15), and the openings (15) of the inner (141) and outer region (142) are not offset from one another, wherein the openings (15) of the first valve plate (13) and the corresponding openings (15) of the second valve plate (14) are the same size, and wherein the first (13) and second valve plates (14) are movable relative to each other in the direction of rotation. Valve device (5) after Claim 1 in that the valve plates (13, 14) each have a plurality of openings (15) which are equidistant from one another. Valve device (5) according to one of the preceding claims, wherein in a first operating mode of the valve device (5) the valve plates (13, 14) are adjusted so that the openings (15) of the outer regions of the valve plates (132, 142) at least partially overlap and in a second mode of operation of the valve means (5), the valve plates (13, 14) are adjusted so that the openings (15) of the inner portions of the valve plates (131, 141) overlap each other at least partially. Valve device (5) after Claim 3 in which, in the first working mode, the valve plates (13, 14) are adjusted so that the openings (15) of the outer regions of the two valve plates (132, 142) are flush with each other and the openings of the inner regions (131, 141) are mutually aligned and in the second mode of operation the valve plates (13, 14) are adjusted so that the openings (15) of the inner regions (131, 141) are flush with each other and the openings (15) of the outer regions (132, 142) are mutually aligned close. Valve device (5) after Claim 3 in that, in a third mode of operation of the valve means (5), the valve plates (13, 14) are adjusted so that the openings of the inner regions (131, 141) and outer regions (132, 142) overlap one another. Valve device (5) according to one of the preceding claims, wherein at least one valve plate (14) is connected to an actuator (17). Valve device (5) after Claim 5 in which the actuator (17) can be activated as a function of the temperature of the exhaust gas in order to adjust the valve plate (14) in the direction of rotation by a predetermined angle. Flow arrangement (4) with a valve device (5) according to one of the preceding claims, in which the first flow path (6) of an exhaust pipe (3), the third flow path (7) of an exhaust aftertreatment device (9) and the third Flow path (8) are associated with a bypass of the exhaust aftertreatment device (9). Motor vehicle with a valve device according to one of Claims 1 - 7 , Method for controlling an exhaust gas flow by means of a valve device according to one of the Claims 1 - 7 , comprising the steps of: - providing the valve means (5), wherein the first valve plate (13) is arranged immovably in the first flow path (6) and the second valve plate (14) is arranged to be movable relative to the first valve plate in the direction of rotation, the outer regions the valve plates (132, 142) are associated with a second flow path (7) and the inner regions of the valve plates (131, 141) are associated with a third flow path (8), operating the valve device (5) in a first operating mode, in which the first ( 13) and the second valve plate (14) are arranged relative to one another such that the openings (15) of the outer regions of the two valve plates (132, 142) at least partially overlap one another and the openings (15) of the inner regions of the two valve plates (131, 141 ) are covered by non-permeable sections of the other valve plate, as long as the exhaust gas temperature is below a predetermined threshold, - in reach activating the actuator (17), which adjusts the second valve plate (14) for a second operating mode of the valve device (5) by a certain angle, so that the openings of the outer regions of the two valve plates (132, 142) non-permeable portions of the other valve plate are covered and the openings of the inner regions (131, 141) at least partially overlap each other, - activating the actuator (17) to again set the first operating mode, when the threshold falls below again. Method according to Claim 10 wherein the first (13) and second valve plates (14) are set in an additional third operating mode for regulating the temperature in the second (7) and / or third flow paths (8) such that the openings (15) of the inner regions (131 , 141) and the outer portions (132, 142) of the first (13) and second valve plate (14) partially overlap each other.

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