Exhaust control valve branch communication and wastegate

Patent metadata

Field	Value
Publication number	US-9810143-B2
Application number	US-201514668498-A
Country	US
Kind code	B2
Filing date	Mar 25, 2015
Priority date	Jan 16, 2015
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

Methods and systems for adjusting a branch communication and wastegate valve in a dual scroll turbocharger system are provided. In one example, a method may include adjusting the branch communication and wastegate valve in a passage connecting a first scroll, a second scroll, and a wastegate passage may control an amount of exhaust flow to a turbine during certain engine operating conditions.

First claim

The invention claimed is:

1. A method, comprising:
adjusting a valve positioned in a passage connecting a first scroll and a second scroll of a turbine and connected to a wastegate passage flowing exhaust around the turbine into a first position to increase an amount of exhaust flow to the turbine when a turbine speed is less than a threshold and during a first load condition of the engine, the first position including the valve being completely closed to each of the first scroll, the second scroll, and the wastegate passage;
adjusting the valve into a second position to decrease the amount of exhaust flow to the turbine when engine speed is less than a threshold engine speed and during a second load condition of the engine, the second position including the valve being partially opened to each of the first and second scrolls, and completely opened to the wastegate passage; and
adjusting the valve from the first position to a third position, without passing through the second position, when engine speed is greater than the threshold engine speed and during a third load condition of the engine, the third position including the valve being completely opened to each of the first scroll and the second scroll, and completely closed to the wastegate passage.

2. The method of claim 1 , wherein the valve positioned within a dividing wall separating the first scroll and the second scroll.

3. The method of claim 1 , wherein the first load condition includes one or more of boost pressure being less than a desired boost pressure, engine load being more than a threshold load, and increasing torque demand.

4. The method of claim 3 , wherein the second load condition includes one or more of boost pressure being greater than the desired boost pressure, engine load being less than the threshold load, and decreasing torque demand, and wherein the third load condition includes engine load being greater than the threshold load.

5. The method of claim 1 , wherein adjusting the valve into the first position includes not communicating exhaust between the first and second scrolls and from the first and second scrolls to the wastegate passage, and wherein adjusting the valve from the first position to the third position includes increasing communication of exhaust between the first scroll and second scroll and not communicating exhaust from the first and second scrolls to the wastegate passage.

6. The method of claim 1 , wherein adjusting the valve into the second position includes partially communicating exhaust between the first and second scrolls and fully communicating exhaust from between the first and second scrolls and to the wastegate passage, and only a portion of exhaust gas less than an amount of exhaust gas flowing between the first and second scrolls when the valve is in the third position is flowed between the first and second scrolls.

7. The method of claim 6 , further comprising increasing exhaust gas flow to each of the first and second scrolls as engine speed increases.

8. The method of claim 1 , further comprising adjusting the valve to a fourth position and fully communicating exhaust between the first and second scrolls and partially communicating exhaust from between the first and second scrolls and to the wastegate passage, the fourth position including the valve being completely opened to each of the first and second scrolls, and partially opened to the wastegate passage, when engine speed is greater than the threshold engine speed and during one or more of the first load condition and turbine speed greater than the threshold.

9. The method of claim 8 , further comprising increasing exhaust gas flow to the wastegate passage as engine speed decreases.

10. The method of claim 1 , wherein the valve is a cylindrical valve that rotates on a first axis perpendicular to a direction of exhaust flow through each of the first scroll and the second scroll, and wherein the cylindrical valve is positioned in an area adjacent to and shares an interface with the first scroll and the second scroll.

11. The method of claim 10 , wherein adjusting the valve from the first position to the third position, without passing through the second position, includes rotating the valve in a clockwise direction.

12. A dual scroll turbocharger system, comprising:
a first scroll;
a second scroll, fluidically separated from the first scroll via a dividing wall arranged between the first scroll and the second scroll;
a passage positioned within the dividing wall, fluidically bridging the first scroll and the second scroll, and in fluidic communication with a point downstream from a turbine;
a valve positioned within the passage and movable between selected positions; and
a controller programmed to adjust the valve between selected positions, including:
a first position wherein the valve is closed to each of the first and second scrolls, and closed to the point downstream from the turbine;
a second position wherein the valve is partially opened to each of the first and second scrolls, and completely opened to the point downstream from the turbine; and
a third position wherein the valve is opened completely to each of the first and second scrolls, and closed to the point downstream from the turbine, and when the valve is moved between the first and third positions, the valve is maintained closed to the point downstream from the turbine without passing through the second position and opening communication between the point downstream from the turbine and each of the first scroll and the second scroll.

13. The dual scroll turbocharger system of claim 12 , wherein the valve is rotatable about an axis that is arranged perpendicular to flow through the first scroll and the second scroll, through the selected positions, the selected positions further including:
a fourth position wherein the valve is opened completely to each of the first and second scrolls, and partially opened to the point downstream from the turbine.

14. The dual scroll turbocharger system of claim 12 , wherein the valve is integrated into one of a cylinder head, a turbocharger, and an exhaust manifold of an engine configured to use the turbocharger system, wherein the valve includes a valve body, and wherein the valve includes one or more external surfaces disposed to allow heat to be removed from the valve body.

15. An engine system comprising:
a first passage for fluid conveyance from a first set of combustion chambers to a turbine;
a second passage for fluid conveyance from a second set of combustion chambers to the turbine, and separated from the first passage by a dividing wall;
a third passage for fluid conveyance from the first passage and the second passage to a location downstream from the turbine;
a valve positioned in the dividing wall; and
a controller programmed to adjust the valve between selected positions, including:
a first position wherein the valve is closed to each of the first and second passages, and closed to the location downstream from the turbine when boost pressure is less than a desired pressure and engine speed is less than a threshold engine speed;
a second position wherein the valve is opened partially to each of the first and second passages, and completely opened to the location downstream from the turbine when boost pressure is greater than the desired pressure and engine speed is less than the threshold engine speed;
a third position wherein the valve is opened completely to each of the first and second passages, and partially opened to the location downstream from the turbine when boost pressure is greater than the desired pressure and engine sp

Assignees

• Ford Global Tech Llc

Inventors

• Mcconville Gregory Patrick
• Styles Daniel Joseph
• Boyer Brad Alan

Classifications

• F02B37/183 Primary

  Arrangements of bypass valves or actuators therefor · CPC title

• F02B37/18 Primary

  by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} · CPC title

• F02B37/22

  by varying cross-section of exhaust passages or air passages {, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits} (F02B37/24 takes precedence) · CPC title

• F02B37/025 Primary

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

• Y02T10/12

  Improving ICE efficiencies · CPC title