Supercharger with exhaust gas recirculation

Patent metadata

Field	Value
Publication number	US-10190544-B2
Application number	US-201615221252-A
Country	US
Kind code	B2
Filing date	Jul 27, 2016
Priority date	Jul 29, 2015
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

An engine, methods and systems are provided for supercharging charge air for internal combustion engines. The engine having an intake, and a blower with at least one impeller in the intake mounted on a rotatable shaft. An EGR line opens into the intake system upstream of the at least one impeller to form a junction point. A flap, pivotable about an axis running transversely with respect to the intake air flow, has: a first position which blocks the intake by way of a front side, and which opens up the EGR line; and a second position to cover the EGR line and open intake system wherein the flap is not planar, and has, at least on the front side thereof, at least one deformation as an unevenness.

First claim

The invention claimed is:

1. A supercharged internal combustion engine comprising:
an intake system for supplying a charge-air flow;
an exhaust-gas discharge system for discharging exhaust gas;
at least one blower arranged in the intake system, which blower is equipped with at least one impeller which is mounted, in a housing, on a rotatable shaft;
an exhaust-gas recirculation arrangement comprising a recirculation line which branches off from the exhaust-gas discharge system and which opens into the intake system upstream of the at least one impeller so as to form a junction point, the recirculation line branching off downstream of a turbine arranged in the exhaust-gas discharge system;
wherein the junction point is formed and arranged in a vicinity of, at a distance Δ from, the at least one impeller;
wherein Δ≤2.0 D v , or Δ≤1.5 D v ; and
wherein D v denotes a diameter of the at least one impeller; and

a flap which is delimited circumferentially by an edge and which is arranged in the intake system at the junction point and which is pivotable about an axis running transversely with respect to a fresh-air flow, in such a way that the flap, in a first end position, by way of a front side, blocks the intake system and opens up the recirculation line, ands in a second end position, by way of a rear side, covers the recirculation line and opens up the intake system;
wherein the flap has at least one deformation as an unevenness;
wherein the at least one deformation extends into a supercharger intake section and engages the supercharger intake section when the flap is in the first end position, the at least one deformation outside of the supercharger intake section when the flap is in the second end position.

2. The supercharged internal combustion engine as claimed in claim 1 ,
wherein the axis is arranged close to an edge section of the flap;
wherein the axis is arranged close to a wall section of the intake system; and
wherein the at least one deformation of the flap comprises at least one bulge.

3. The supercharged internal combustion engine as claimed in claim 2 , wherein the at least one bulge is convex.

4. The supercharged internal combustion engine as claimed in claim 2 , wherein the at least one bulge is concave.

5. The supercharged internal combustion engine as claimed in claim 1 , wherein the at least one deformation on the front side of the flap faces toward and opposes the charge-air flow at least in the first end position of the flap.

6. The supercharged internal combustion engine as claimed in claim 1 , wherein the at least one deformation encompasses an edge region of the flap situated opposite the axis.

7. The supercharged internal combustion engine as claimed in claim 6 , wherein the at least one deformation encompasses an edge corner region on one side of the flap.

8. The supercharged internal combustion engine as claimed in claim 7 , wherein the at least one deformation of the flap in the edge corner region yields a bulged form.

9. The supercharged internal combustion engine as claimed in claim 1 , wherein at least one exhaust-gas turbocharger is provided which comprises the turbine arranged in the exhaust-gas discharge system and a compressor arranged in the intake system, and wherein the at least one blower is the compressor of the at least one exhaust-gas turbocharger, wherein the at least one blower is a radial blower.

10. The supercharged internal combustion engine as claimed in claim 1 , wherein the at least one blower has an inlet region which runs coaxially with respect to the shaft of the at least one impeller.

11. The supercharged internal combustion engine as claimed in claim 1 , wherein the recirculation line is equipped with a valve which comprises an axially displaceable valve body which is connected, and thereby mechanically coupled, to the flap, a pivoting of the flap causing a displacement of the valve body.

12. The supercharged internal combustion engine as claimed in claim 1 , wherein Δ≤0.75 Dv.

13. The supercharged internal combustion engine as claimed in claim 1 ,
wherein the at least one blower has an inlet region which runs, and is formed, coaxially with respect to the shaft of the at least one impeller; and
wherein the at least one deformation is positioned in the inlet region to forcibly impart an axial fresh-air flow speed component transverse with respect to the shaft of the at least one impeller.

14. A method for supercharging charge air for an internal combustion engine comprising:
positioning a flap at a junction in an intake passage wherein an intake line is able to provide intake aft from a first direction and an exhaust gas recirculation line is able to provide exhaust gas from a second direction;
wherein the flap has at least one deformation as an unevenness;
wherein the at least one deformation extends into a supercharger intake section and engages the supercharger intake section when the flap is in the first end position, the at least one deformation outside of the supercharger intake section when the flap is in the second end position;

wherein the junction is formed and arranged in a vicinity of, at a distance Δ from, the at least one impeller of a compressor;
wherein Δ≤2.0 D v or Δ≤1.5 D v ; and
wherein D v denotes a diameter of the at least one impeller;

pivoting the flap about a pivot axis, the pivot axis oriented transverse to a section of the intake passage upstream of the compressor, from a first position wherein a first side of the flap blocks the intake passage, to a second position; and
while in the second position, imparting a transverse flow component to an intake airflow with a flow modifying feature extending from the first side of the flap, while a second side of the flap at least partially covers the exhaust gas recirculation line.

15. The method of claim 14 , further comprising passing at least one of the intake air and the exhaust gas to a blower.

16. The method of claim 14 , further comprising passing the intake aft with a partial transverse flow to the at least one impeller and directing the flow to a combustion chamber.

17. The method of claim 14 , wherein the imparting the partial transverse flow includes at least one of:
positioning the flow modifying feature at an edge region of the flap; and
positioning bulge formed on the first side of the flap in a path of the intake air.

18. The method of claim 14 , further comprising positioning the flap in the first position wherein the flap blocks the intake passage and opens up the exhaust gas recirculation line and wherein the pivoting the flap about the pivot axis includes pivoting the flap about a line close to an edge section of the flap.

19. A supercharger system comprising:
a supercharger intake section to receive intake air;
an exhaust gas recirculation (EGR) port to receive exhaust gas from an engine;
a supercharger outlet to port at least one of the intake and the exhaust gas to the engine; and
a flap delimited circumferentially by an edge, and pivotable about an axis running transversely with respect to the supercharger intake section;
wherein the flap has a first position to block flow from the supercharger intake section, and a second position to cover the EGR port and open the supercharger intake section, the flap having a flow modification element on one &de thereof to add a transverse flow component to an intake flow at least when in the second position, the flow modification element extending into the supercharger intake section and engaging the supercharger int

Assignees

• Ford Global Tech Llc

Inventors

• Sommerhoff Franz Arnd
• Kemmerling Joerg
• Kindl Helmut Matthias
• Smiljanovski Vanco
• Friederichs Hanno
• Kuske Andreas

Classifications

• F02M26/06

  Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor · CPC title

• F02M26/71

  Multi-way valves · 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

• F02M26/70 Primary

  Flap valves; Rotary valves; Sliding valves; Resilient valves · CPC title

• F02M26/21

  with EGR valves located at or near the connection to the intake system · CPC title