WO2016162106A1

WO2016162106A1 - Regulating device for an exhaust-gas-conducting section of an exhaust-gas turbocharger

Info

Publication number: WO2016162106A1
Application number: PCT/EP2016/000455
Authority: WO
Inventors: Jason WALKINGSHAW; Tobias Scheuermann; Georgios IOSIFIDIS; Manfred GUTHÖRLE; Hans-Peter Oehl
Original assignee: Ihi Charging Systems International Gmbh
Priority date: 2015-04-07
Filing date: 2016-03-15
Publication date: 2016-10-13
Also published as: DE102015105222A1

Abstract

The invention relates to a regulating device for an exhaust-gas-conducting section of an exhaust-gas turbocharger, wherein the regulating device (19) is designed for guiding a flow of a fluid into a bypass duct (22), which is formed in the exhaust-gas-conducting section (9) through which flow can pass, for the purposes of bypassing a turbine wheel (14) of the exhaust-gas-conducting section (9), which turbine wheel is arranged rotatably in the exhaust-gas-conducting section (9) in a wheel chamber of the exhaust-gas-conducting section (9), and for guiding the flow of the fluid into a first channel (17) of the exhaust-gas-conducting section (9) and into a second channel (18) of the exhaust-gas-conducting section (9), and wherein the regulating device (19) has a shut-off element (24) and a valve housing (25) which accommodates the shut-off element (24), with the aid of which shut-off element communication openings (29, 30, 31) of the valve housing (25) can be entirely or at least partially shut off or opened up for flow guidance purposes, and wherein the shut-off element (24) in the valve housing (25) is designed to be capable of performing a translational movement along a longitudinal axis (26) of the valve housing (25).

Description

Regulating device for an exhaust gas guide portion of an exhaust gas turbocharger

The invention relates to a control device for an exhaust gas guide portion of an exhaust gas turbocharger specified in the preamble of claim 1. Art.

The published patent application DE 10 2010 008 411 A1 discloses a control device for an exhaust gas guide section of an exhaust gas turbocharger. The regulating device is for opening and closing a bypass channel in the flow-through

Exhaust gas guide section provided for bypassing a turbine wheel of the exhaust gas guide section rotatably arranged in the exhaust gas guide section in a wheel chamber of the exhaust gas guide section. Furthermore, the control device serves to separate or connect a first flow of the exhaust gas guide section with a second flow of the exhaust gas guide section. A locking member of the control device has a longitudinal axis along which it is movable, on. With the help of a translatory

Movement along the longitudinal axis inflow sections of the floods and the bypass channel are fully or partially closed or opened.

With the help of such a control device, it is possible in certain operating points of the exhaust gas turbocharger, especially at operating points having large

Flow rates to bypass the turbine completely or partially, and the turbine wheel by closing or connecting the floods flow to

apply, so that a more efficient operation of the exhaust gas turbocharger is possible.

A flow connection or blocking the floods and the bypass channel can be brought about with the aid of the spring-loaded locking member, wherein the locking member has a first plate and a second plate, which block or release the floods and the bypass channel depending on the flow line.

Thus, it is the object of the present invention, a cost-effective

provide. This object is achieved with the aid of a control device for an exhaust gas guide section of an exhaust gas turbocharger having the features of patent claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the dependent claims.

A control device according to the invention for an exhaust gas guide section of an exhaust gas turbocharger is for the flow line of a fluid which the

Exhaust passage portion flows through, designed. It serves for the flow line or flow guidance of the fluid in a bypass channel which is formed in the flow-through exhaust gas guide section and which serves to bypass a valve

An exhaust gas guide portion in a wheel chamber of the exhaust gas guide portion rotatably arranged turbine wheel of the exhaust gas guide portion and the flow line of the fluid in a first flow of the exhaust gas guide portion and in a second flow of the exhaust gas guide portion. The control device has a locking member and a

Locking member receiving valve housing, with the aid of communication openings of the valve housing to the flow line can be completely or at least partially blocked or released. The locking member is in the valve housing a

translational movement formed executable along a longitudinal axis of the valve housing. The locking member is in the form of a slider, and has a first locking member surface and a second locking member surface. It serves the first locking member surface blocking the flow through the communication opening and the second

Sperrgliedfläche a blocking of the flow starting from one of

Communication openings in one of the other communication openings.

The advantage of the shape of the locking member is the fact that the locking member is easy to manufacture. Since only a translational movement to position the locking member is necessary, the risk of jamming of the locking member due to leverage forces that could occur on the locking member, if this example. Is designed in the form of a flap, as they usually occur in wastegate valves, essential reduced.

Furthermore, a tendency to noise such as rattling or rattling, which can occur in conventional wastegate valves is also reduced. Also, the control device according to the invention due to its surface seal on a good sealing effect.

Another advantage is a faster and safer adjustment of the locking member, so that in particular in an operation of an internal combustion engine, which a

Having exhaust gas turbocharger with a control device according to the invention, a rapid adaptation of the operation of the exhaust gas turbocharger to the needs of

Internal combustion engine is ensured. This results advantageously due to the rapid adaptation to the needs of the internal combustion engine, a reduction in fuel consumption and thus a reduction of emissions of the internal combustion engine.

In one embodiment, the locking member is advantageously designed in the form of a cylinder.

In a further embodiment, the locking member is hollow, whereby can be reduced to rotate the actuator necessary movement forces compared to a solid trained actuator. Furthermore, there is the possibility of reducing deformations which can occur due to the high exhaust gas temperatures. In particular, can be influenced by the formation of a variable wall thickness of the locking member on the deformation. That is, it can, for example, extremely temperature-stressed areas of the locking member with a higher

Wall thickness and / or be provided with a special shape than less temperature-stressed areas.

In one embodiment of the control device according to the invention, the locking member has a movement device whose force is applied to the movement of the locking member on the locking member in the direction of its longitudinal axis at this attacking. The advantage is a tilt-free movement of the locking member to secure the adjustment.

For receiving power, the locking member has a coaxially formed with the longitudinal axis receiving opening. In this receiving opening can be received in the axial direction along the longitudinal axis and extending along this moving actuator, whereby its direction of movement is transmitted to the locking member. Due to the fact that the direction of movement is formed coaxially with the longitudinal axis of the locking member and its direction of movement, tilting moments can occur Clamp the locking member would cause to be avoided.

In a further preferred embodiment, the blocking member is formed of a ceramic material. The control device and in particular the locking member are exposed during operation temperature fluctuations, which a high

Temperature gradients may have, with very high absolute temperatures in the range of about 1000 ° C usually occur. Ceramic material is a particularly temperature-resistant material, so that components made of this material are resistant to high temperatures. Thus, the control device according to the invention, which is made of ceramic material, is particularly reliable.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. The features mentioned above in the description and

Feature combinations as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination but also in others

Combinations or alone, without departing from the scope of the invention. Identical or functionally identical elements are assigned identical reference numerals. For reasons of clarity, it is possible that the elements are not provided with reference numbers in all figures, but without losing their assignment. Showing:

Fig. 1 is a schematic representation of an internal combustion engine with a

Exhaust gas turbocharger having the control device according to the invention,

Fig. 2 is a perspective view of a locking member of

Control device according to the invention

3 is a further perspective view of the locking member with a view of a second locking member surface,

4 shows in a longitudinal section the control device with the locking member in a first position, Fig. 5 in a longitudinal section, the control device with the locking member in a second position, and

Fig. 6 in a longitudinal section, the control device with the locking member in a third position.

The internal combustion engine 1 shown in Fig. 1, which as a diesel engine or as

Gasoline engine is executed, has an exhaust tract 2. In operation, the sucks

Internal combustion engine 1 via a fresh air line 32 combustion air, which is discharged after an under fuel supply combustion in the internal combustion engine 1 as exhaust gas via the exhaust tract 2.

The exhaust tract 2 comprises a first exhaust manifold 3 connected to the internal combustion engine 1 and a second exhaust manifold 4 likewise connected to the internal combustion engine 1, wherein a first exhaust pipe 5 is assigned to the first exhaust manifold 3 and a second exhaust pipe 6 to the second exhaust manifold 4.

An exhaust gas turbocharger 7 is positioned at an end of the first exhaust gas line 5 facing away from the engine 1 and at an end of the second exhaust gas line 6, which has a housing 8, which can flow through an exhaust gas guide section 9

Air guide portion 10 and a bearing portion 1 1, wherein the

Air guide section 10 in the fresh air line 32 and the exhaust gas guide section 9 are arranged in the exhaust tract 2. The bearing portion 11 is between the

Air guide portion 10 and the exhaust gas guide portion 9 is positioned.

The exhaust gas turbocharger 7 has, in addition to the housing 8, a power tool 12, which comprises a compressor wheel 13 for sucking and compressing combustion air, a turbine wheel 14 for expanding exhaust gas, and a shaft 15 rotationally fixedly connecting the compressor wheel 13 to the turbine wheel 14 with a first axis of rotation 16 , The compressor wheel 13 is in the air guide section 10, the turbine wheel 14 is in the exhaust gas guide section 9 and the shaft 15 is rotatably mounted in the bearing section 11.

During operation of the internal combustion engine 1, the turbine wheel 14 as a result of

Actuation by the exhaust gas of the internal combustion engine 1 in a rotational movement offset, with the help of the shaft 15, the compressor 13 is also rotated, so that it sucks fresh air or combustion air and compressed.

To improve the operating behavior of the exhaust gas turbocharger 7, in particular at low loads and speeds of the internal combustion engine 1, the

Exhaust gas guide section 9 formed in two columns, wherein the first exhaust pipe 5 is connected to a first flow 17 of the exhaust gas guide section 9 and the second exhaust pipe 6 with a second flow 18 of the exhaust gas guide section 9. The first

Flood 17 is carried by the second flood 18 separated by a non-illustrated housing-fixed flood separation wall in the exhaust gas guide section 9.

In a variant, the exhaust gas guide section 9 additionally has a variable

Turbine geometry to further improve the performance on.

The exhaust tract 2 upstream of the turbine wheel 14 is an adjustable control device

19 associated with the aid of a damming of exhaust gas upstream of the turbine wheel 14 and / or an inflow of the turbine wheel 14 is controllable.

The control device 19 is a first channel as a connection to the first exhaust pipe 5

20, which is formed branching off from the first exhaust pipe 5 upstream of the turbine wheel 14. A connection of the control device 19 with the second exhaust pipe 6 is formed as a second channel 21 branching off from the second exhaust pipe 6 upstream of the turbine wheel 14. Furthermore, the control device 19 has a connection in the form of a bypass channel 22, hereinafter referred to as the third channel, which downstream of the turbine wheel 14 in the first exhaust pipe fifth

opens.

To blow the exhaust gas from the first exhaust pipe 5 into the second exhaust pipe 6, the exhaust gas is diverted from the first channel 20 into the second channel 21 with the aid of the control device 19. To blow off exhaust gas past the turbine wheel 14, the exhaust gas from the first channel 20 and the second channel 21 is guided into the third channel 22 with the aid of the regulating device 19.

The control device 19 can be integrated in the exhaust tract 2 at different locations. Advantageously, the control device 19 is integrated into the exhaust gas guide section 9, so that upstream of the turbine 14 exhaust gas from the first flood 17 diverted or blown into the second flood 18 and / or exhaust gas from the two floods 17, 18 on

Turbine 14 can be blown over. Positive flow effects, which occur due to the circulation and / or blow-off, due to the short

Flow paths are used to the turbine 14.

The control device 19 comprises a locking member 24, s. Figures 2 and 3, and a

Valve housing 25. The locking member 24 is formed as a slide, which has the shape of a cylinder, and is displaceable by means of a not shown moving device or actuator for moving the slider 24, along a longitudinal axis 26 of the valve housing 25. The slider 24 is hollow. It has a first locking member surface 33 in the form of its lateral surface and a second locking member surface 34, which are formed transversely, in particular normal to the longitudinal axis 26.

The slide 24 has two grooves 35, into which for forming a seal of the individual communication openings 29, 30, 31 each have a sealing element 36

is included.

The valve housing 25 is formed as a body housing and has a corresponding to the locking member 24 cylindrically shaped recess 27 having a receiving opening 28, wherein the recess 27, the slider 24 is designed to be axially movable receiving.

The locking member 24 has a receiving opening 37 which is coaxial with the

Longitudinal axis 26 is formed. In this receiving opening 37 is preferably in the direction of the longitudinal axis 26 and thus in the direction of movement of the actuator 24 moving not shown actuator inserted.

In the valve housing 25, a first communication opening 29 is formed, which is formed as a connection between the locking member 24 facing the end of the first channel 20 and the recess 27. A second communication opening 30 of the valve housing 25 is disposed adjacent to the first communication opening 29 and is formed as a connection between a locking member 24 facing the end of the second channel 21 and the recess 27. A third communication port 31 of the Valve housing 25 is disposed adjacent to the first communication opening 29 and is formed as a connection between a locking member 24 facing the end of the third channel 22 and the recess 27.

The control device 19 is adjustable for three operating modes. In a first

Operating mode, s. 4, the normal operation of the exhaust gas turbocharger 7, the second communication port 30 is closed by means of the first locking member surface 33, so that the exhaust gas from the first exhaust pipe 5 via the first flood 17 directly on the

Turbine 14 can flow. Although the first communication port 29 is not closed by the locking member 24, but no Umblasung between the

Exhaust pipes 5, 6 or floods 17, 18 take place, since the second communication opening 30 is closed and communication between the communication openings 29, 30, 31 is prevented by the second locking member surface 34.

In a second operating mode, the blowing, the turbine wheel 14 is acted upon by exhaust gas from both flows 17, 18, whereby upstream of the turbine wheel 14 a part of the exhaust gas is diverted from the first exhaust pipe 5 into the second exhaust pipe 6. FIG. 5 shows a positioning of the blocking member 24 in this operating mode, wherein the first communication opening 29 and the second communication opening 30 are opened, and exhaust gas from the first exhaust pipe 5 via the first channel 20 through the first communication opening 29 into the second exhaust pipe 6 via the second

Communication port 30 can flow and vice versa. According to one

Displacement of the locking member 24, the first communication opening 29 and the second communication opening 30 are partially and / or fully opened.

In a third operating mode, the simultaneous blowing and blowing, the exhaust gas flows from the first exhaust pipe 5 into the second exhaust pipe 6 or vice versa,

while at the same time exhaust gas can flow into the third channel 22 via the third communication opening 31. The position of the blocking member 24 is, as shown in Fig. 6, adjusted so that the first communication port 29, the second communication port 30 and the third communication port 31 are opened, so that exhaust gas in the channels 20, 21, 22 formed pressure ratios can flow. Depending on the positioning of the locking member 24 in the individual operating modes, the communication openings 29, 30, 31 are more or less widely opened, whereby a fine regulation of the transition from one operating mode to the other

is possible. This is a jump-free operation of the exhaust gas turbocharger 7, which manifests itself by a sudden drop or by a sudden increase in a rotational speed of the exhaust gas turbocharger 7, when changing the application of the turbine wheel 14 with exhaust gas in dependence on loads and speeds of the internal combustion engine 1 can be realized.

In a variant of the control device 19 according to the invention, which is not illustrated in more detail, the valve housing 25 is formed integrally with the exhaust gas guide section 9.

In a further variant, not shown, the locking member 24 is formed of a ceramic material. Preferably, the valve housing 25 is also made of a ceramic material.

In a further variant, not shown, the locking member 24 is rotatable about an axis of rotation which corresponds to the longitudinal axis 26. This can be a verscheiß reduced.

Claims

claims

1. Control device for an exhaust gas guide portion of an exhaust gas turbocharger, wherein the control device (19) for flow conduction of a fluid in a throughflow in the exhaust guide portion (9) formed bypass passage (22) for bypassing a in the exhaust guide portion (9) rotatably arranged in a wheel chamber of the exhaust gas guide portion (9) Turbine wheel (14) of the exhaust gas guide portion (9) and the flow line of the fluid in a first flow (17) of the exhaust gas guide portion (9) and in a second flow (18) of the exhaust gas guide portion (9) is formed, and wherein the control device (19) a Locking member (24) and a locking member (24) receiving the valve housing (25), with the aid of communication ports (29, 30, 31) of the valve housing (25) to the flow line completely or at least partially blocked or released, and wherein the locking member (24) in the valve housing (25) a translational movement along a longitudinal axle (26) of the valve housing (25) is designed to be executable,

characterized in that

the locking member (24) is in the form of a slider, and a first

Locking member surface (33) and a second locking member surface (34), wherein the first locking member surface (33) blocking the flow through the communication opening (29; 30; 31) and the second locking member surface (34) blocking the flow from one of the communication ports ( 29; 30; 31) in one of the other communication openings (30; 31; 29), and wherein by means of the locking member (24) communication between the communication openings (30, 31, 29) can be prevented.

2. Control device according to claim 1,

characterized in that

the locking member (24) is in the form of a cylinder.

3. Control device according to claim 1 or 2,

characterized in that the locking member (24) is hollow.

4. Control device according to one of the preceding claims,

characterized in that

the locking member (24) has a movement device whose force is applied to the movement of the locking member (24) on the locking member (24) in the direction of its longitudinal axis (26) engaging this.

5. Control device according to claim 4,

characterized in that

The locking member (24) for receiving a coaxially with the longitudinal axis (26) formed receiving opening (37).

6. Control device according to one of the preceding claims,

characterized in that

the locking member (24) is formed of a ceramic material.