Vtg turbocharger with wastegate controlled by a common actuator

Patent metadata

Field	Value
Publication number	US-2016298534-A1
Application number	US-201415037705-A
Country	US
Kind code	A1
Filing date	Nov 19, 2014
Priority date	Nov 26, 2013
Publication date	Oct 13, 2016
Grant date	—

Abstract

A variable turbine geometry (VTG) turbocharger ( 100 ) includes a VTG assembly ( 25 ) for controlling guide vanes ( 30 ) in combination with a wastegate assembly ( 60, 260 ) having a wastegate valve ( 62, 262 ) configured to control exhaust gas flow through a wastegate port ( 7 ) in the turbine housing ( 4 ) thereby selectively bypassing the turbine wheel ( 12 ). The guide vanes ( 30 ) are actuated continuously, while the wastegate valve ( 62, 262 ) only starts to open at a predetermined configuration of the VTG assembly ( 25 ) in which the guide vanes 30 are open to a set amount. For some exhaust gas flow rates, the guide vanes ( 30 ) and the wastegate valve ( 62, 262 ) are fully open at the same time. A common actuator ( 110, 50 ) controls both the guide vanes ( 30 ) and the wastegate valve ( 62, 262 ) of the wastegate assembly ( 60, 260 ).

First claim

What is claimed is:

1 . A variable turbine geometry (VTG) turbocharger ( 100 ) with a turbine wheel ( 12 ) in a turbine housing ( 4 ) comprising:
a VTG assembly ( 25 ) including a series of vane rings ( 40 , 42 , 50 ) and a series of pivotable guide vanes ( 30 ) that are operably connected to at least one of the vane rings ( 50 ); a wastegate assembly ( 60 ) including a wastegate valve ( 62 , 262 ) configured to control exhaust gas flow through a wastegate port ( 7 ) in the turbine housing ( 4 ) thereby selectively bypassing the turbine wheel ( 12 ); and a common actuator ( 110 , 50 , 44 ) that controls movement of both the guide vanes ( 30 ) and the wastegate valve ( 62 , 262 ).

2 . The turbocharger ( 100 ) of claim 1 wherein the guide vanes ( 30 ) are actuated at all levels of exhaust gas flow through the turbine housing ( 4 ), and the wastegate valve ( 62 , 262 ) is not actuated until the guide vanes ( 30 ) are open at a set amount.

3 . The turbocharger ( 100 ) of claim 1 wherein the common actuator ( 100 , 50 , 44 ) controls the wastegate valve ( 62 , 262 ) to move linearly with respect to the wastegate port ( 7 ).

4 . The turbocharger ( 100 ) of claim 1 wherein a tab ( 44 ) protruding from the at least one of the vane rings ( 50 ) provides actuation of the wastegate valve ( 62 , 262 ) to selectively open the wastegate port ( 7 ).

5 . The turbocharger ( 100 ) of claim 4 wherein the wastegate valve ( 62 , 262 ) is biased to a closed position via a spring ( 70 , 269 ) disposed between the wastegate valve ( 62 , 262 ) and the turbine housing ( 4 ), the spring ( 70 , 269 ) configured so that a spring force of the spring ( 70 , 269 ) can be overcome when the tab ( 44 ) contacts the wastegate valve ( 62 , 262 ).

6 . The turbocharger ( 100 ) of claim 1 wherein the actuator ( 110 , 50 , 44 ) actuates the wastegate valve ( 262 ) to move rotatably with respect to the wastegate port ( 7 ), and is connected to the wastegate ( 262 ) via a push rod ( 266 ).

7 . A variable turbine geometry (VTG) turbocharger ( 100 ) comprising
a turbine wheel ( 12 ) in a turbine housing ( 4 ), a VTG assembly ( 25 ) including an adjustment ring ( 50 ) and a plurality of pivotable guide vanes ( 30 ) that are operably connected to the adjustment ring ( 50 ), a wastegate assembly ( 60 ) including a wastegate valve ( 62 , 262 ) configured to control exhaust gas flow through a wastegate port ( 7 ) in the turbine housing ( 4 ) thereby selectively bypassing the turbine wheel ( 12 ), and a common actuator ( 44 ) disposed on the adjustment ring ( 50 ) that controls movement of both the guide vanes ( 30 ) and the wastegate valve ( 62 , 262 ), wherein the guide vanes ( 30 ) are actuated at all levels of exhaust gas flow through the turbine housing ( 4 ) and the wastegate valve ( 62 , 262 ) is actuated based on an angular position of the adjustment ring ( 50 ) relative to the turbine housing ( 4 ).

8 . The turbocharger ( 100 ) of claim 7 wherein the wastegate valve ( 62 , 262 ) opens an angular position of the adjustment ring ( 50 ) corresponding to a high flow rate defined as when the guide vanes ( 30 ) are at least 70 percent open.

9 . The turbocharger ( 100 ) of claim 7 wherein the wastegate valve ( 62 , 262 ) opens an angular position of the adjustment ring ( 50 ) corresponding to a high flow rate defined as when the guide vanes ( 30 ) are at least 80 percent open.

Assignees

• Borgwarner Inc

Inventors

• Lotz Robert

Classifications

• F01D17/105

  by passing part of the fluid · CPC title

• F02B37/186

  Arrangements of actuators or linkage for bypass valves · CPC title

• F05D2260/79

  Bearing, support or actuation arrangements therefor · CPC title

• F02B37/24 Primary

  by using pumps or turbines with adjustable guide vanes · CPC title

• F05D2270/60

  Control system actuates means · CPC title