Twin scroll turbocharger with EGR takeoffs

• US 9,157,380 B2
• Filed: 10/29/2013
• Issued: 10/13/2015
• Est. Priority Date: 06/14/2010
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Styles, Daniel Joseph, Boyer, Brad, Marshall, Lawrence, Leiby, James
• Primary Examiner(s): Chang, Ching
• Application Number:
  US14/066,239
• Publication Number:
  US 20140053550A1
• Time in Patent Office: 714 Days
• Field of Search: 606/02, 606/052, 123/568.12
• US Class Current: 1/1
• CPC Class Codes: F02B 37/025 Multiple scrolls or multiple gas passages guiding the gas to the pump drive
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/183 Arrangements of bypass valves or actuators therefor
• CPC Class Codes: F02D 13/0242 Variable control of the exhaust valves only
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/0065 Specific aspects of external EGR control constructional details of EGR system F02M26/00
• CPC Class Codes: F02D 41/0077 Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position EGR valve position sensor F02M26/48
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

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.

Claims

1. A turbocharged engine 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;

an EGR conduit coupled to the first and second EGR takeoffs having an EGR valve positioned therein downstream of both the first and second valves; and

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.

2. The engine of claim 1, wherein the first condition includes high load and low speed engine operating conditions.

3. The engine of claim 1, wherein the second condition includes high load and high speed engine operating conditions.

4. The engine of claim 1, wherein the first and second valves are dual butterfly valves.

5. The engine of claim 4, wherein the dual butterfly valves include a coolant circulating therethrough, and where the dual butterfly valves are coupled to a common rotating shaft.

6. The engine of claim 5, wherein the dual butterfly valves are housed in a dual-bored body.

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

8. The engine of claim 1, wherein the instructions further include instructions to close the first and second valves during engine accelerations.

9. The engine of claim 1, further comprising 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 of claim 1, 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 of claim 1, 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 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 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.

13. The engine of claim 12, wherein the first condition includes high load and low speed engine operating conditions.

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

15. The engine of claim 14, wherein the first and second valves are dual butterfly valves.

16. The engine of claim 15, wherein the dual butterfly valves include a coolant circulating therethrough, and where the dual butterfly valves are coupled to a common rotating shaft.

17. The engine of claim 16, wherein the dual butterfly valves are housed in a dual-bore body.

18. The engine of claim 13, wherein the first and second valves are configured to open and close synchronously.

19. The engine of claim 13, wherein the instructions further include instructions to close the first and second valves during engine accelerations.

20. The engine of claim 12, further comprising 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.

21. The engine of claim 12, 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 12, 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.