Twin scroll turbocharger with egr takeoffs

Patent metadata

Field	Value
Publication number	US-2016003132-A1
Application number	US-201514850865-A
Country	US
Kind code	A1
Filing date	Sep 10, 2015
Priority date	Jun 14, 2010
Publication date	Jan 7, 2016
Grant date	—

Abstract

Systems and methods for operating a twin scroll turbocharged engine with a junction configured to selectively control exhaust gas delivery to an exhaust gas recirculation system and a twin scroll turbine are provided.

First claim

1 . A turbocharged in-line engine system comprising:
a first scroll and a second scroll fluidically coupled to a turbine, the first scroll coupled to a first set of inner engine cylinders, the second scroll coupled to a second set of outer engine cylinders; a first EGR takeoff including a first valve, the first EGR takeoff fluidically coupled to the first scroll; a second EGR takeoff including a second valve, the second EGR takeoff fluidically coupled to the second scroll, the first and second valves coupled in a common housing, the first and second valves being dual butterfly valves where the dual butterfly valves are coupled to a common rotating shaft; a turbine wastegate coupled around the turbine; and an EGR conduit coupled to the first and second EGR takeoffs.

2 . The engine system of claim 1 , further comprising
a computer readable storage medium having instructions encoded thereon, including:
instructions to, during a first condition close the first and second valves; and
instructions to, during a second condition open the first and second valves.

3 . The engine system of claim 2 , wherein the first condition includes high load and low speed engine operating conditions.

4 . The engine system of claim 2 , wherein the second condition includes high load and high speed engine operating conditions.

5 . The engine system of claim 1 , wherein the dual butterfly valves include a coolant circulating therethrough.

6 . The engine system of claim 1 , wherein the first and second valves are configured to open and close synchronously.

7 . The engine system of claim 2 , wherein the instructions further include instructions to close the first and second valves during engine accelerations.

8 . The engine system of claim 5 , wherein the common housing has a dual-bored body housing the dual butterfly valves.

9 . The engine system of claim 1 , wherein the housing further comprises a dual-bore body with an engine mount having a substantially flat mounting portion coupled with the engine, and further having a turbine mount opposing the engine mount, the turbine mount having a substantially flat mounting portion coupled with the turbine.

10 . The engine system of claim 2 , wherein the instructions further include instructions to operate the engine with a second amount of positive valve overlap in at least one cylinder of the engine during the second condition, where the second amount of positive valve overlap is less than a first amount of positive valve overlap employed during the first condition.

11 . The engine system of claim 2 , wherein the instructions further include instructions to operate the engine with a second amount of spark retard in at least one cylinder of the engine, where the second amount of spark retard is less than a first amount of spark retard used in the first condition.

12 . A turbocharged engine system, comprising:
a first scroll and a second scroll fluidically coupled to a turbine, the first scroll coupled to a first set of engine cylinders, the second scroll coupled to a second set of engine cylinders; a first EGR takeoff including a first valve, the first EGR takeoff fluidically coupled to the first scroll; a second EGR takeoff including a second valve, the second EGR takeoff fluidically coupled to the second scroll, both the first and second EGR takeoffs positioned in a junction therebetween; an EGR conduit coupled to the first and second EGR takeoffs downstream of the junction; and a dual-bore body housing the first and second valves, the housing having an engine mount having a substantially flat mounting portion coupled with the engine, and further having a turbine mount opposing the engine mount, the turbine mount having a substantially flat mounting portion coupled with the turbine.

13 . The engine system of claim 12 , further comprising:
a computer readable storage medium having instructions encoded thereon, including: instructions to, during a first condition close the first and second valves; and instructions to, during a second condition open the first and second valves.

14 . The engine system of claim 13 , wherein the first condition includes high load and low speed engine operating conditions.

15 . The engine system of claim 14 , wherein the second condition includes high load and high speed engine operating conditions.

16 . The engine system of claim 15 , wherein the first and second valves are dual butterfly valves.

17 . The engine system of claim 16 , wherein the dual butterfly valves include a coolant circulating therethrough, and where the dual butterfly valves are coupled to a common rotating shaft.

18 . The engine system of claim 15 , wherein the first and second valves are configured to open and close synchronously.

19 . The engine system of claim 15 , wherein the instructions further include instructions to close the first and second valves during engine accelerations.

20 . The engine system of claim 18 , wherein the dual butterfly valves are housed in a dual-bore body.

21 . The engine of claim 14 , wherein the instructions further include instructions to operate the engine with a second amount of spark retard in at least one cylinder of the engine, where the second amount of spark retard is less than a first amount of spark retard used in the first condition.

22 . The engine of claim 14 , wherein the instructions further include instructions to operate the engine with a second amount of positive valve overlap in at least one cylinder of the engine during the second condition, where the second amount of positive valve overlap is less than a first amount of positive valve overlap employed during the first condition.

Assignees

• Ford Global Tech Llc

Inventors

• Styles Daniel Joseph
• Boyer Brad
• Marshall Lawrence
• Leiby James

Classifications

• F02B37/183

  Arrangements of bypass valves or actuators therefor · CPC title

• F02D41/0077

  Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position (EGR valve position sensor F02M26/48) · CPC title

• F02B37/025 Primary

  Multiple scrolls or multiple gas passages guiding the gas to the pump drive · CPC title

• F02D41/0065

  Specific aspects of external EGR control (constructional details of EGR system F02M26/00) · CPC title

• F02D41/0007

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title