Bypass mechanism for an exhaust system

Patent metadata

Field	Value
Publication number	US-9638098-B2
Application number	US-201514623992-A
Country	US
Kind code	B2
Filing date	Feb 17, 2015
Priority date	Feb 17, 2015
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

A bypass mechanism is disclosed for use with a turbocharger. The bypass mechanism may have an exhaust passage formed by at least a first wall, and a bypass manifold formed by at least a second wall surrounding the exhaust passage and including a space between the first wall and the second wall. The bypass mechanism may further have at least one opening in the first wall fluidly connecting the exhaust passage with the space. At least one valve is configured to open and close the opening to selectively allow exhaust gas to pass from the exhaust passage to the space through the at least one opening. The space may be fluidly connected to at least one entry passage of an exhaust stack. In addition, the at least one opening and the at least one entry passage may be positioned on opposite sides of the exhaust passage.

First claim

What is claimed is:

1. A bypass mechanism for use with a turbocharger, comprising:
an exhaust passage formed by at least a first wall;
a bypass manifold formed by at least a second wall surrounding the exhaust passage and including a space between the first wall and the second wall;
at least two openings in the first wall fluidly connecting the exhaust passage with the space;
at least one first valve configured to open and close to selectively allow exhaust gas to pass from the exhaust passage to the space through at least one first opening of the at least two openings; and
at least one second valve configured to open and close to selectively allow exhaust gas to pass from the exhaust passage to the space through at least one second opening of the at least two openings.

2. The bypass mechanism of claim 1 , wherein the at least one second valve includes at least two second valves and the at least one second opening includes at least two second openings, wherein each of the at least two second valves is configured to open and close a second opening of the at least one second openings respectively.

3. The bypass mechanism of claim 2 , wherein the at least one first opening fluidly connects the exhaust passage to the space through a passage that extends parallel to the exhaust passage.

4. The bypass mechanism of claim 3 , wherein the at least one first valve is positioned in the passage that extends parallel to the exhaust passage.

5. The bypass mechanism of claim 4 , wherein the passage is fluidly connected to the space by a manifold entrance, and wherein the manifold entrance is positioned between two of the at least two second openings.

6. The bypass mechanism of claim 5 , wherein the bypass manifold includes a first pathway for the exhaust gas to pass around an outside of the exhaust passage on a first side of the first wall and a second pathway for the exhaust gas to pass around the outside of the exhaust passage on a second side of the first wall.

7. The bypass mechanism of claim 6 , wherein one of the at least two second openings is adjacent to the first pathway and another one of the at least two second openings is adjacent to the second pathway.

8. The bypass mechanism of claim 3 , wherein the two second openings directly fluidly connect the exhaust passage with the space.

9. The bypass mechanism of claim 1 , wherein the at least one first valve is a butterfly valve and the at least one second valve is a poppet valve.

10. A bypass mechanism for use with a turbocharger, the turbocharger including a turbine with a turbine inlet and a turbine outlet, comprising:
an exhaust passage formed by at least a first wall;
a bypass manifold formed by at least a second wall surrounding the exhaust passage at a first location on the exhaust passage and including a space between the first wall and the second wall;
at least one opening in the first wall fluidly connecting the exhaust passage with the space; and
at least one valve configured to open and close a corresponding opening to selectively allow exhaust gas to pass from the exhaust passage to the space through the at least one opening;
wherein the turbine inlet is fluidly connected to the exhaust passage at a second location, the second location downstream of the first location;
wherein the space is fluidly connected to at least one entry passage of an exhaust stack through a bypass passage;
wherein the turbine outlet is fluidly connected to the bypass passage; and
the at least one opening and wherein the at least one entry passage are positioned on opposite sides of the exhaust passage.

11. The bypass mechanism of claim 10 , wherein the at least one entry passage is fluidly connected to a conditioning member of an aftertreatment component.

12. The bypass mechanism of claim 10 , wherein the at least one opening includes a first opening and second opening downstream from the first opening.

13. The bypass mechanism of claim 12 , wherein one of the first opening and the second opening fluidly connects the exhaust passage to the space through a passage that extends parallel to the exhaust passage.

14. The bypass mechanism of claim 10 , wherein the at least one valve includes a plurality of valves.

15. The bypass mechanism of claim 14 , wherein the plurality of valves includes a plurality of poppet valves.

16. The bypass mechanism of claim 14 , wherein the plurality of valves includes at least one butterfly valve.

17. The bypass mechanism of claim 10 , wherein the bypass manifold includes a first pathway for the exhaust gas to pass around an outside of the exhaust passage on a first side of the first wall and a second pathway for the exhaust gas to pass around the outside of the exhaust passage on a second side of the first wall.

18. The bypass mechanism of claim 17 , wherein the at least one opening is fluidly connected to the first pathway and the second pathway.

19. The bypass mechanism of claim 17 , wherein the bypass mechanism is configured to divide exhaust gas that enters the space approximately evenly between the first pathway and the second pathway.

20. An exhaust system for an engine, comprising:
an exhaust passage configured to receive exhaust from the engine;
an exhaust stack configured to direct exhaust to the atmosphere;
a turbocharger fluidly connected between the exhaust passage and the exhaust stack;
an aftertreatment component including at least one conditioning member; and
a bypass mechanism configured to selectively direct exhaust gas from the exhaust passage to bypass the turbine and flow into the aftertreatment component, the bypass mechanism including:
a bypass manifold surrounding the exhaust passage;
at least two openings in the exhaust passage fluidly connecting the exhaust passage with the bypass manifold; and
at least two valves each configured to open and close a respective one of the at least two openings to selectively allow exhaust gas to pass from the exhaust passage to the bypass manifold through the respective opening,
wherein the bypass manifold is fluidly connected to at least one entry passage fluidly connected to the at least one conditioning member,
wherein the at least two openings and the at least one entry passage are positioned on opposite sides of the exhaust passage, and
wherein the bypass manifold includes a first pathway for the exhaust gas to pass around an outside of the exhaust passage on a first side of the exhaust passage and a second pathway for the exhaust gas to pass around the outside of the exhaust passage on a second side of the exhaust passage.

Assignees

• Electro Motive Diesel Inc

Inventors

• Svihla Gary R
• Norris Nicholas Denman

Classifications

• Y02T10/144

  Cross-Sectional Technologies · mapped topic

• F02B37/183 Primary

  Arrangements of bypass valves or actuators therefor · CPC title

• F01N2390/02

  using electric components only · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title