Methods and systems for an exhaust system

Patent metadata

Field	Value
Publication number	US-11060435-B2
Application number	US-201916671713-A
Country	US
Kind code	B2
Filing date	Nov 1, 2019
Priority date	Nov 13, 2018
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

Methods and systems are provided for an exhaust gas system. In one example, a system comprises a conical passage fluidly coupling a turbine outlet to an aftertreatment device. The conical passage may further comprise a scavenge valve to adjust exhaust gas flow therethrough.

First claim

The invention claimed is:

1. A system, comprising:
an exhaust gas inlet region comprising a conical shape arranged between a turbine and at least one aftertreatment device downstream of the turbine, wherein a diameter of the exhaust gas inlet region increases in a direction of exhaust gas flow, wherein an adjustable scavenging valve adjustable between a first position and a second position is arranged in the exhaust gas inlet region, and wherein exhaust gas flows through the scavenging valve in both the first position and the second position of the scavenging valve.

2. The system of claim 1 , wherein the scavenging valve comprises a plurality of guide blades, each guide blade comprising an airfoil configured to rotate about an axis angled to the direction of exhaust gas flow.

3. The system of claim 2 , wherein a single actuator actuates the plurality of guide blades.

4. The system of claim 2 , wherein the plurality of guide blades comprises a plurality of actuators, each actuator configured to actuate a single airfoil corresponding to each guide blade.

5. The system of claim 1 , wherein the scavenging valve is a diaphragm.

6. The system of claim 5 , wherein the diaphragm is inflated or deflated to adjust the diameter of the exhaust gas inlet region.

7. The system of claim 1 , wherein the scavenging valve is an iris diaphragm.

8. An engine system, comprising:
an engine fluidly coupled to an exhaust passage, wherein a turbine is arranged along the exhaust passage;
an exhaust gas inlet region downstream of the turbine and fluidly coupling a turbine outlet to an aftertreatment device; and
an adjustable scavenging valve arranged in the exhaust gas inlet region configured to expand and/or narrow a crosssectional flow-through area of the exhaust gas inlet region in response to an exhaust gas mass flow, wherein the scavenging valve is a diaphragm,
wherein the exhaust gas inlet region comprises a conical shape.

9. The engine system of claim 8 , wherein the diaphragm is an iris diaphragm.

10. The engine system of claim 8 , further comprising a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to adjust a position of the scavenging valve in response to the exhaust gas mass flow, wherein the instructions further enable the controller to adjust a position of the scavenging valve in response to an engine load.

11. The engine system of claim 10 , wherein instructions enable the controller to adjust the position to a more open position in response to the exhaust gas mass flow increasing or the engine load increasing.

12. The engine system of claim 10 , wherein the instructions enable the controller to adjust the position to a more closed position in response to the exhaust gas mass flow decreasing or the engine load decreasing.

13. The engine system of claim 10 , wherein the instructions enable the controller to maintain the position of the scavenging valve in response to the exhaust gas mass flow remaining constant or the engine load remaining constant.

14. A system, comprising:
an exhaust passage comprising a turbine arranged upstream of an aftertreatment device relative to a direction of exhaust gas flow;
an exhaust gas inlet region arranged between the turbine and the aftertreatment device, wherein the exhaust gas inlet region comprises a conical shape, wherein a diameter of the exhaust gas inlet region increases in the direction of exhaust gas flow;
a scavenging valve arranged in the exhaust gas inlet region, the scavenging valve comprising a plurality of airfoils configured to rotate along an axis perpendicular to the direction of exhaust gas flow; and
a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
rotate the plurality of airfoils to more open positions in response to an exhaust gas mass flow increasing; and

rotate the plurality of airfoils to more closed positions in response to the exhaust gas mass flow decreasing.

15. The system of claim 14 , further comprising a plurality of actuators, wherein each actuator is configured to adjust one airfoil of the plurality of airfoils.

16. The system of claim 14 , wherein the scavenging valve is arranged closer to the turbine than the aftertreatment device.

17. The system of claim 14 , wherein a mixing zone is arranged between the scavenging valve and the aftertreatment device.

18. The system of claim 14 , wherein more closed positions inhibit exhaust gas flow through the scavenging valve, and wherein the more open positions promote exhaust gas flow through the scavenge valve.

Assignees

• Ford Global Tech Llc

Inventors

• Smiljanovski Vanco
• Kemmerling Joerg
• Kindl Helmut Matthias
• Friederichs Hanno
• Kuske Andreas
• Wunderlich Frank
• Kraemer Frank
• Brinkmann Franz J
• Henkelmann Lutz
• Sommerhoff Franz Arnd

Classifications

• F01N3/101

  Three-way catalysts · CPC title

• F01N2240/20

  a flow director or deflector · CPC title

• F01N2470/30

  Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow · CPC title

• F01N3/2892 Primary

  Exhaust flow directors or the like, e.g. upstream of catalytic device · CPC title

• F01N3/106

  Auxiliary oxidation catalysts · CPC title