Wastegate arrangement in a turbine

Abstract

Wastegate arrangement (201) in a turbine (200) of an internal combustion engine (12), comprising the following: a wastegate line (212) that bypasses a turbine rotor (300); a wastegate valve (202) comprising a valve sealing plate (216) configured to sit in a closed position on and seal against a wastegate line outlet (214); and a flow diverting nose (222) coupled to the valve sealing plate (216), extending in the direction upstream of the wastegate line outlet (214) and separating the wastegate line outflow (306) and a turbine rotor outflow (304); characterized by the fact that the turbine (200) has an area (320) of an internal surface extending downstream of the wastegate line outlet (214) and includes a storage area (322) for receiving the flow diverting nose (222) when the wastegate valve (202) is in a closed position.

Description

Area

[0001] The present disclosure relates to a wastegate arrangement in a turbine of a turbocharger. Background and brief presentation

[0002] Supercharging devices, such as turbochargers, are used in engines to provide increased engine power and efficiency. However, it may be desirable to adjust the boost provided to the engine based on engine operating conditions to improve combustion efficiency and increase engine power. To enable boost adjustment, devices such as wastegates are provided to vary the amount of exhaust gas flowing through the turbine rotor, thereby adjusting the speed of the turbine and thus the speed of the compressor in the turbocharger. This allows the amount of boost provided to the engine to be varied based on engine operating conditions to provide increased engine efficiency and / or power.

[0003] JP 2007-247560 A discloses an internal combustion engine with a compressor arranged at an intake port of the engine, an exhaust passage through which exhaust gas flows and which drives a turbine, a bypass passage provided in the exhaust passage to bypass the turbine, and a wastegate valve arranged at an outlet of the bypass passage to open and close the bypass passage. The internal combustion engine also has a guide device by means of which exhaust gas is guided to an air-fuel ratio sensor when the wastegate valve is open.

[0004] However, wastegate operation can disrupt the turbine exhaust flow, causing a buildup of backpressure that reduces turbine performance. This impairs turbocharger operation. US 4,256,285 A discloses a wastegate valve with a vane member coupled thereto. The vane member interacts with the wastegate flow to assist valve opening during valve actuation. However, the vane member does not mitigate flow interference between the wastegate exhaust flow and the turbine rotor exhaust flow. Thus, mixing of the wastegate and rotor exhaust flow creates a restriction downstream of the engine, increasing backpressure in the turbine. Thus, the wastegate disclosed in US 4,256,285 negatively impacts turbocharger performance.In state-of-the-art turbines, flow diverter walls may be integrally formed with a wastegate line outlet to reduce flow interference between the turbine outflow and the wastegate outflow.

[0005] The object of the present invention is therefore to eliminate the above-mentioned disadvantages, in particular to mitigate flow interference between the wastegate outflow and the turbine rotor outflow.

[0006] The problem is solved with the features of independent patent claims 1, 13 and 17.

[0007] In one approach, a wastegate assembly is provided in a turbine of an internal combustion engine. The wastegate assembly includes a wastegate conduit bypassing a turbine rotor, a valve sealing plate configured to seat and seal against a wastegate conduit outlet in a closed position, and a flow diverter lobe coupled to the valve sealing plate, extending upstream of the wastegate conduit outlet and separating a wastegate conduit outlet and a turbine rotor outlet. The flow diverter lobe reduces flow interference between the wastegate outlet and the turbine rotor outlet, thereby reducing turbine backpressure and improving turbine operation. This increases turbine efficiency and longevity.

[0008] The above advantages and other advantages and features of the present description will become apparent from the following detailed description alone or in conjunction with the accompanying drawings. Short description of the drawings Fig. Figure 1 shows a schematic representation of an engine and a turbocharger in a vehicle; Fig. 2 shows an exemplary turbine and an exemplary wastegate valve; Fig. Figure 3 shows a cross-sectional view of the turbine and wastegate valve shown in Fig. 2 are shown; Fig. 4 shows a cross-sectional view of the Fig. 2 shown turbine and wastegate valve in an open configuration; and Fig. 5 shows a method for operating a turbocharger; and Fig. Figure 6 shows a representation of a turbine according to the state of the art.

[0009] Fig. 2-4 are approximately to scale, but other relative dimensions may be used. Detailed description

[0010] Fig. 6 shows a turbine 600 and a wastegate valve 602 according to the prior art. The turbine 600 further includes a wastegate conduit outlet 604 and a flow diverting wall 606. It is understood that the wall 606 may be integrally cast with a portion of the turbine or welded to a fixed internal surface of the turbine. As shown, the flow diverting wall 606 is positioned between the outflow of the wastegate conduit outlet 604 and a turbine outlet 608, thereby reducing flow interference between the wastegate outlet and the turbine outflow. It is further understood that the flow diverting wall 606 is spaced from the valve sealing plate 610. The inventors are in the Fig. 6, some disadvantages have been encountered. For example, some engines and turbines may have packaging and / or tooling limitations that do not permit this flow diverter wall. Furthermore, the presence of such a wall may prevent assembly of the wastegate components in the confined turbine housing exit area.

[0011] A wastegate having a flow diverting nose coupled to a valve sealing plate, extending upstream of the wastegate conduit outlet, and positioned between the wastegate conduit outlet and the exhaust port has been developed to address at least some of the disadvantages of the Fig. 6, as well as other prior art turbines. The position of the flow diverter lobe allows for mitigation of interference between the wastegate outflow and the turbine rotor outflow. This can improve turbine operation during wastegate operation. Furthermore, directly coupling the flow diverter lobe to the valve sealing plate allows the flow diverter lobe to be added to existing turbine designs during a later stage of the manufacturing process, if desired. Consequently, the production costs of the turbine can be reduced.

[0012] Fig. 1 shows a schematic representation of a vehicle 10 with an engine 12. An intake system 14 is configured to supply intake air to the engine 12. Similarly, an exhaust system 16 is configured to receive exhaust gas from the engine 12. A turbocharger 18 is also included in the vehicle 10. The turbocharger 18 includes a compressor 20 and a turbine 22. The compressor 20 is coupled to the turbine 22 via a drive shaft 24 or other suitable mechanical component configured to transfer rotational energy between the turbine and the compressor.

[0013] The intake system 14 includes a filter 26 and a throttle valve 28. An arrow 30 indicates the flow of intake air through the filter 26 and to the compressor 20. It is understood that the compressor 20 may be included in the intake system 14. Furthermore, an arrow 32 indicates the flow of intake air from the compressor 20 to the engine 12. It is understood that one or more intake ducts, intake manifolds, etc., may provide the aforementioned intake airflow function.

[0014] The engine includes at least one cylinder 34. It is understood that combustion cycles may be performed in cylinder 34. For example, a four-stroke combustion cycle may be implemented. However, other types of suitable combustion cycles have also been contemplated.

[0015] Furthermore, the exhaust system 16 includes the turbine 22 and an emission control device 36. The emission control device 36 may include a catalyst and / or a filter, etc. An arrow 38 indicates the flow of exhaust gas from the engine 12 to the turbine 22. Furthermore, an arrow 40 indicates the flow of exhaust gas from the turbine 22 and through the emission control device 36. It is understood that one or more exhaust conduits, exhaust manifolds, etc., may provide the aforementioned exhaust flow function.

[0016] The turbine 22 includes a wastegate valve 50 coupled to a wastegate line 52. The wastegate valve 50 and the wastegate line 52 are contained in a wastegate assembly 53. It is understood that the wastegate valve 50 and the wastegate line 52 are integrated into the turbine 22.

[0017] Wastegate valve 50 is configured to open and close to provide the desired bypass exhaust flow within turbine 22. In this way, the speed of the turbine, and thus the turbocharger, can be adjusted based on engine operating conditions by adjusting wastegate valve 50. Wastegate valve 50 is coupled to an actuator 55 via a mechanical coupling component(s) 57. The mechanical coupling between wastegate valve 50 and the actuator is described in more detail herein.

[0018] The wastegate line 52 includes an inlet 54 positioned upstream of a turbine rotor 56 and an outlet 58 positioned downstream of the turbine rotor 56. In this way, the wastegate line 52 bypasses the turbine rotor 56. It is understood that the wastegate valve 50 may be coupled to the outlet 58. It is further understood that a turbine rotor outflow and a wastegate line outflow meet at a location 60 downstream of the wastegate line outlet and rotor outlet. This location may be referred to as a confluence section. The wastegate valve and the wastegate line are in Fig. 1. However, the wastegate valve and wastegate line exhibit additional geometric complexity, which is described in more detail here.

[0019] A controller 100 may be included in the vehicle 10. The controller 100 may be configured to receive signals from sensors (e.g., temperature sensors, engine speed sensors, exhaust gas composition sensors, etc.) in the vehicle and engine, as well as to send command signals to vehicle and engine components. Various components in the vehicle 10 and the engine 12 may be controlled, at least in part, by a control system including the controller 100 and by input from a vehicle operator 102 via an input device 104. In this example, the input device 104 includes an accelerator pedal and a pedal position sensor 106 for generating a proportional pedal position signal PP. In Fig. 1, the controller 100 is depicted as a microcomputer including a processor 108 (e.g., a microprocessor unit), input / output ports 110, an electronic storage medium for executable programs and calibration values, depicted in this particular example as a read-only memory (ROM) 112 (e.g., a read-only memory chip), a random access memory (RAM) 114, a retained memory (KAM) 116, and a data bus. The storage medium read-only memory 112 may be programmed with computer-readable data representing instructions executable by a processor 108 for performing the methods described below, as well as other variants anticipated but not specifically listed. The controller 100 is configured to send a control signal to the wastegate valve 50. Furthermore, it should be understood that the controller may be configured to send control signals to other components.

[0020] Fig. 2 shows a representation of a first exemplary turbine 200, wherein the wastegate assembly 201 includes the wastegate valve 202. The turbine 200 and the wastegate valve 202. The turbine 200 can be in the Fig. 1 shown vehicle 10. Thus, the turbine 200 can be the one shown in Fig. 1, and the wastegate valve 202 may be the one shown in Fig. 1 shown wastegate valve 50.

[0021] The turbine 200 includes a housing 204. The housing 204 includes openings 206 configured for connection to downstream components, such as an exhaust conduit, an emission control device, etc. The housing 204 includes additional openings 208 configured for connection to other vehicle and / or engine components.

[0022] A rotor exhaust duct 210 configured to receive exhaust gas from a turbine rotor is formed in Fig. 2. It is understood that exhaust gas flows from a rotor (not shown) to the rotor outlet passage 210. A wastegate conduit 212 and the outlet 214 (i.e., wastegate conduit outlet) of the conduit are also shown in Fig. 2. As discussed above, the wastegate line bypasses the turbine rotor. As shown in Fig. 2, the wastegate valve 202 includes a valve sealing plate 216 configured to sit on and seal against the wastegate conduit outlet 214 in a closed position. It is understood that Fig. 2 illustrates the wastegate valve 202 in a closed position. The valve sealing plate 216 is coupled to an actuating arm 218. The actuating arm 218 is connected to an actuator, such as the one shown in Fig. 1, to move the valve sealing plate relative to the passage such that it results in complete coverage / blockage in a fully closed position. The valve sealing plate can translate and / or rotate relative to the housing and bypass opening during operation of the turbocharger.

[0023] Additional structural components provide the mechanical coupling between the valve sealing plate 216 and the actuator, such as an actuating component 219 extending through the housing 204. The actuating arm 218 and the valve sealing plate 216 pivot about an axis 220 of the actuating component 219. Thus, the actuating arm 218 is configured to rotate about the axis 220 in response to input from the actuator. Thus, the valve sealing plate 216 is spaced from the wastegate conduit outlet 214 when the wastegate valve 202 is configured in an open position. The spacing may include longitudinal movement parallel to a central axis of the conduit and / or rotational movement about a pivot axis.

[0024] The wastegate assembly 201 further includes a flow diverting tab 222. The flow diverting tab 222 extends upstream of the wastegate line outlet 214 to separate a wastegate line outflow and a turbine rotor outflow. An arrow 224 indicates the general exhaust flow from the wastegate line when the wastegate valve 202 is in an open position. The flow diverting tab 222 extends upstream of the wastegate line outlet 214 when the wastegate valve is in a closed position, with the valve sealing plate 216 seating on and sealing against the wastegate valve outlet 214. Furthermore, the flow diverting tab 222 may extend upstream of the wastegate line outlet 214 when the wastegate valve is in an open position. The flow diverting nose 222 is positioned between the wastegate line outlet 214 and the rotor outlet channel 210.In this way, flow interference between the wastegate line outflow and the turbine rotor outflow is reduced when the wastegate is in an open position.

[0025] In the Fig. 2, the flow diverting tab 222 is coupled to the valve sealing plate 216 (e.g., directly coupled, for example, without intervening components therebetween that cause relative movement therebetween). In one example, the flow diverting tab 222 and the valve sealing plate 216 form a continuous mold. However, in other examples, the tab and the plate may not form a continuous mold. Further, in one example, the flow diverting tab 222 may be coupled to the valve sealing plate 216 via a welded connection. Additionally or alternatively, the flow diverting tab 222 may be coupled to the valve sealing plate 216 via a fastening device (e.g., bolts, screws, etc.). In another example, the valve sealing plate and the flow diverting tab may be cast as a single component.

[0026] Furthermore, the flow diverting nose 222 includes a first surface 240 and a second surface 242. In the illustrated example, the first surface 240 is perpendicular to the second surface 242. Furthermore, the first and second surfaces are planar.

[0027] Furthermore, the second surface 242 is parallel to a central axis 230 of the wastegate conduit outlet 214. Furthermore, the first surface 240 is perpendicular to the central axis 230. However, other flow diverter nose surface contours, orientations, etc., are also contemplated. It is understood that the flow diverter nose 222 extends in an axial direction relative to the central axis 230 of the wastegate conduit outlet 214.

[0028] In another example, the first surface 240 of the flow diverting nose 222 may be curved. In such an example, the curvature of the first surface of the flow diverting nose may be similar to a contour of an outer surface of the wastegate conduit outlet 214. However, other flow diverting nose contours have also been contemplated. The curvature of the nose provides additional wastegate flow field control.

[0029] A third surface 232, connected to the first and second surfaces (240 and 242) of the flow diverting tab 222, is curved in the illustrated example. However, other flow diverting tab contours have also been contemplated. It is understood that when the wastegate valve is in the open position (e.g., high-lift position) during normal operation, the flow diverting tab 222 is located between the two flow paths (i.e., the turbine outflow and the wastegate outflow). However, in some examples, the wastegate valve may be opened to an extent beyond the high-lift position during certain engine operating conditions, such as a cold start. In such an example, the flow diverting tab may not extend completely upstream of the wastegate conduit outlet. However, other flow diverting tab contours have also been contemplated.

[0030] In the example of Fig. 2, the flow diverting nose may be formed from sheet metal cutting and bent into the position shown and positioned to move with the valve sealing plate.

[0031] In one example, the flow diverter tab 222 and the valve sealing plate 216 are constructed from different materials. However, in another example, the flow diverter tab 222 and the valve sealing plate 216 may comprise similar materials. Example materials may include an alloy, such as high-temperature alloys, alloys with a high nickel content, etc. The flow diverter tab 222 may be a solid piece of this material that is bent into the shape illustrated and / or described herein.

[0032] Furthermore, a width 270 of the flow diverter nose 222 is less than a diameter of the wastegate conduit outlet. It is understood that the diameter is twice the radius 252. With such a design of the flow diverter nose, the generation of turbulence by the wastegate is reduced.

[0033] In one example, the flow diverting tab 222 may be cast, forged, or formed integrally with the wastegate valve 202 and, specifically, the valve sealing plate 216 within the wastegate valve. Thus, in one example, the flow diverting tab may be integrally formed with the valve sealing plate. Furthermore, the tab may be integrated into or attached to the sealing plate or valve arm through a variety of manufacturing techniques.

[0034] Fig. 3 shows a cross-sectional view of the turbine 200 and the wastegate valve 202 shown in Fig. 2. In the illustrated example, the valve sealing plate 216 sits on the wastegate line outlet 214 in a closed position and seals against it. However, in the open position, the valve sealing plate is spaced from the wastegate line outlet. The wastegate line 212, the rotor outlet channel 210, and the turbine rotor 300 are also shown in Fig. 3. A turbine rotor inlet channel 302, which supplies exhaust gas to the turbine rotor 300, is also shown in Fig. 3. The rotor exhaust duct 210, which is configured to receive exhaust gas from the turbine rotor 300, is also shown in Fig. 3. Furthermore, the flow diverting nose 222 is coupled to the valve sealing plate 216. As previously discussed, the flow diverting nose 222 may be coupled to the valve sealing plate 216 via a weld joint 310.

[0035] An arrow 304 indicates a general outflow of the turbine rotor 300. Furthermore, an arrow 306 indicates a general outflow of the wastegate conduit 212 when the wastegate valve is in an open position. The flow diverter lobe 222 reduces interference between the wastegate conduit outflow and the turbine rotor outflow. It is understood that the flow profiles in the turbine 200 have a higher level of complexity, which is not illustrated.

[0036] Fig. 3 also shows a region 320 of an inner surface of the turbine 200 that extends downstream of the wastegate conduit outlet 214. The extension of the region 320 downstream of the wastegate conduit outlet enables a reduction in flow interference between the wastegate outflow and the turbine rotor outflow. Specifically, the extension of the region 320 downstream of the outlet enables a reduction in flow interference when the wastegate valve is in an open position with the flow diverting tab not extending upstream of the outlet. As shown, the region 320 includes a shelf 322 for receiving the flow diverting tab 222 when the wastegate is in the closed position. Thus, the flow diverting tab 222 overlaps a portion of the region 320 when the wastegate is in the closed position.In addition, the area 320 provides a surface that allows the sealing plate to sit upon and seal against.

[0037] Fig. 4 shows a cross-sectional view of the Fig. 2 and wastegate valve 202 in an open position. The flow diverting nose 222 extends upstream of the wastegate conduit outlet 214 of the wastegate conduit 212 and is positioned between the turbine rotor outflow 304 and the wastegate conduit outflow 306 when the wastegate valve 202 is in an open position. Again, the turbine rotor 300, the turbine rotor inlet port 302, and the rotor outlet port 210 are shown.

[0038] Fig. 5 shows a method 500 for operating a turbine. The method 500 can be implemented by the methods described above with reference to Fig. 1-4 or can be implemented by another suitable turbine.

[0039] At 502, the method includes operating a wastegate assembly to adjust the flow rate of exhaust gas through a wastegate conduit based on engine operating conditions. At 504, the method includes separating the exhaust flow from a rotor exhaust port and a wastegate conduit outlet via the flow diverter tab included in the wastegate assembly, positioned between the wastegate conduit outlet and the rotor exhaust port and extending upstream of the wastegate conduit outlet.

[0040] It should be noted that the example control and estimation routines included herein may be used with various engine and / or vehicle system configurations. The control methods and routines disclosed herein may be stored as executable instructions in non-volatile memory and performed by the control system comprising the controller in combination with the various sensors, actuators, and other engine hardware. The specific routines described herein may represent one or more of any number of processing strategies, such as event-driven, interrupt-driven, multitasking, multithreading, and the like. Thus, various illustrated acts, operations, and / or functions may be performed in the illustrated order, in parallel, or in some cases, omitted.Likewise, the order of processing is not required to achieve the features and advantages of the exemplary embodiments described herein, but is provided merely for ease of illustration and description. One or more of the illustrated acts, operations, and / or functions may be performed repeatedly depending on the particular strategy being used. Further, the described acts, operations, and / or functions may graphically represent code to be programmed into non-transitory memory of the computer-readable storage medium in the engine control system, wherein the described acts are performed by executing the instructions in a system comprising the various engine hardware components in combination with the electronic controller.

[0041] It is understood that the configurations and routines disclosed herein are exemplary in nature, and that these specific embodiments are not to be interpreted in a limiting sense, as numerous variations are possible. For example, the above technology may be applied to V-6, I-4, I-6, V-12, horizontally opposed four, and other engine types. The subject matter of the present disclosure includes all novel and non-obvious combinations and sub-combinations of the various systems and configurations, and other features, functions, and / or characteristics disclosed herein.

[0042] The following claims specifically point to certain combinations and subcombinations that are considered novel and non-obvious. These claims may refer to "an" element or "a first" element, or the equivalent thereof. Such claims should be understood to encompass the inclusion of one or more such elements, neither requiring nor excluding two or more such elements. Other combinations and subcombinations of the disclosed features, functions, elements, and / or properties may be claimed by amending the present claims or by presenting new claims in this or a related application. Such claims, whether their scope is broader, narrower, the same, or different with respect to the original claims, are also considered to be included within the subject matter of the present disclosure.

Claims

[1] Wastegate arrangement (201) in a turbine (200) of an internal combustion engine (12), comprising: a wastegate line (212) bypassing a turbine rotor (300); a wastegate valve (202) comprising a valve sealing plate (216) configured to sit on and seal against a wastegate conduit outlet (214) in a closed position; and a flow diverting nose (222) coupled to the valve sealing plate (216), extending upstream of the wastegate line outlet (214) and separating the wastegate line outflow (306) and a turbine rotor outflow (304); characterized by , that the turbine (200) has a portion (320) of an inner surface extending downstream of the wastegate conduit outlet (214) and includes a shelf (322) for receiving the flow diverting tab (222) when the wastegate valve (202) is in a closed position. [2] The wastegate assembly (201) of claim 1, wherein a width of the flow diverting nose (222) is less than a diameter of the wastegate conduit outlet (214). [3] The wastegate assembly (201) of claim 1, wherein an outer surface of the flow diverting nose (222) is parallel to a central axis (230) of the wastegate conduit outlet (214). [4] The wastegate assembly (201) of claim 3, wherein the flow diverting tab (222) extends upstream of the wastegate conduit outlet (214) when the valve sealing plate (216) is in the closed position. [5] Wastegate assembly (201) according to claim 1, wherein the flow diverting nose (222) is curved. [6] The wastegate assembly (201) of claim 1, further comprising an actuating arm (218) coupled to the valve sealing plate (216) and an actuator (55). [7] The wastegate assembly (201) of claim 6, wherein the actuating arm (218) is configured to rotate in response to an input from the actuator (55). [8] The wastegate assembly (201) of claim 1, wherein the flow diverting nose (222) and the valve sealing plate (216) are constructed of different materials. [9] Wastegate assembly (201) according to claim 1, wherein the flow diverting nose (222) and the valve sealing plate (216) form a continuous shape. [10] The wastegate assembly (201) of claim 1, wherein the flow diverting nose (222) and the valve sealing plate (216) comprise a similar material. [11] The wastegate assembly (201) of claim 1, wherein the flow diverting tab (222) extends upstream of the wastegate conduit outlet (214) when the valve sealing plate (216) is in an open position, the valve sealing plate (216) being spaced from the wastegate conduit outlet (214). [12] Wastegate assembly (201) according to claim 1, wherein the flow diverting nose (222) is coupled to the valve sealing plate (216) via a welded connection or fastening device. [13] Turbine (200) in a turbocharger (18) for an internal combustion engine (12), comprising: an inlet channel (302) supplying exhaust gas to a turbine rotor (300); a rotor exhaust passage (210) receiving exhaust gas from the turbine rotor (300); a wastegate line (212) coupled to the inlet channel (302) and the outlet channel (210); a wastegate valve (202) comprising a valve sealing plate (216) configured to sit on and seal against a wastegate conduit outlet (214) in a closed position; and a flow diverting nose (222) coupled to the valve sealing plate (216), extending upstream of the wastegate line outlet (214) and positioned between the wastegate line outlet (214) and the rotor outlet channel (210); characterized by , that the turbine (200) has a portion (320) of an inner surface extending downstream of the wastegate conduit outlet (214) and includes a shelf for receiving the flow diverting tab (222) when the wastegate valve (202) is in a closed position. [14] Turbine (200) according to claim 13, wherein the flow diverting nose (222) is curved. [15] The turbine (200) of claim 13, wherein an outer surface of the flow diverting nose (222) is parallel to a central axis (230) of the wastegate conduit outlet (214). [16] Turbine (200) according to claim 13, wherein the flow diverting nose (222) is integrally formed with the valve sealing plate (216). [17] Wastegate arrangement (201) in a turbine (200) of an internal combustion engine (12), comprising: a wastegate line (212) bypassing a turbine rotor (300); a wastegate valve (202) comprising a valve sealing plate (216) configured to sit on and seal against a wastegate conduit outlet (214) in a closed position; and a flow diverting nose (222) coupled to the valve sealing plate (216), and extending upstream of the wastegate line outlet (214); characterized by , that the turbine (200) has a portion (320) of an inner surface extending downstream of the wastegate conduit outlet (214) and includes a shelf (322) for receiving the flow diverting tab (222) when the wastegate valve (202) is in a closed position; and that the flow diverting nose (222) is positioned directly downstream of a confluence point (60) of the wastegate line outflow (306) and the turbine rotor outflow (304) for separating the wastegate line outflow (306) from the turbine rotor outflow (304). [18] Wastegate assembly (201) according to claim 17, wherein the flow diverting nose (222) comprises a first surface (240) directly coupled to the valve sealing plate (216) and a second surface (242) arranged perpendicular to the first surface (240). [19] The wastegate assembly (201) of claim 17, wherein the flow diverting tab (222) extends upstream of the wastegate conduit outlet (214) when the valve sealing plate (216) is in an open position.

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