# US 2021/0340935 A1 · Egr ejector system

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- Number: US 2021/0340935 A1
- Document ID: US20210340935A1
- Status: Published application
- Kind: A1
- Application number: 17/261,697
- Filed: 2019-07-19
- Published: 2021-11-04
- Earliest claimed: 2018-07-20
- Assignees: Eaton Intelligent Power Limited
- Applicants: Eaton Intelligent Power Limited
- Inventors: James MCCARTHY; Aseem DESAI; Sagar CHAVAN
- Web page: https://patentgrep.com/patent/US20210340935A1

## CPC

- F02M 26/19: Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
- B01F 23/10: Mixing gases with gases
- B01F 25/31241: {the main flow being injected in the circumferential area of the venturi, creating an aspiration in the central part of the conduit}
- B01F 25/31252: {Nozzles}
- B01F 25/4331: {Mixers with bended, curved, coiled, wounded mixing tubes or comprising elements for bending the flow}
- F02M 26/04: with a single turbocharger
- F02M 26/12: characterised by means for attaching parts of an EGR system to each other or to engine parts
- F02M 26/14: in relation to the exhaust system
- F02M 35/10091: {characterised by details of intake ducts: shapes; connections; arrangements (ducts within or on the plenum chamber F02M35/10039)}
- F02M 35/10144: {Connections of intake ducts to each other or to another device}
- F02M 35/10222: {Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission}
- B01F 2215/0431: Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
- F02M 26/02: EGR systems specially adapted for supercharged engines
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)

## Abstract

An exhaust gas recirculation ejector system for an engine that includes an air conduit coupled to an engine providing charge air to the engine. The air conduit includes at least one bend formed therein. The at least one bend includes a port formed therein. An EGR conduit is coupled to an exhaust manifold of the engine at a first end of the EGR conduit. A second end of the EGR conduit passes through the port and extends into the air conduit at the bend defining an ejector mixing the charge air and exhaust gas before entry into the engine.

## Claims

### Claim 1

An exhaust gas recirculation ejector system for an engine comprising:
an air conduit coupled to an engine providing charge air to the engine, the air conduit including at least one bend formed therein, the at least one bend including a port formed therein;
an EGR conduit coupled to an exhaust manifold of the engine at a first end of the EGR conduit;
a second end of the EGR conduit passing through the port and extending into the air conduit at the bend defining an ejector mixing the charge air and exhaust gas before entry into the engine.

### Claim 2 (depends on 1)

The exhaust gas recirculation ejector system of claim 1 wherein the bend spans from 60 to 120 degrees.

### Claim 3 (depends on 2)

The exhaust gas recirculation ejector system of claim 2 wherein the bend spans 90 degrees.

### Claim 4 (depends on 2)

The exhaust gas recirculation ejector system of claim 2 wherein the bend spans 90 degrees and is the last bend before an inlet manifold of the engine.

### Claim 5 (depends on 1)

The exhaust gas recirculation ejector system of claim 1 wherein the air conduit includes an inner radius R1 and the EGR conduit includes an inner radius R2 and a ratio of is from 2.5 to 2.9.

### Claim 6 (depends on 5)

The exhaust gas recirculation ejector system of claim 5 wherein R2 is from 13-20 millimeters.

### Claim 7 (depends on 5)

The exhaust gas recirculation ejector system of claim 5 wherein R2 is from 15-16 millimeters.

### Claim 8 (depends on 1)

The exhaust gas recirculation ejector system of claim 1 wherein the air conduit includes an inner diameter D1 and the EGR conduit includes an inner diameter D2 and wherein D2 is at 2.23 times smaller relative to D1.

### Claim 9 (depends on 1)

The exhaust gas recirculation ejector system of claim 1 wherein the charge air includes an outlet flow path and the second end of the EGR conduit passes through the port and includes an inlet flow path and wherein an angle A defined by an angle between the outlet flow path and the inlet flow path is from 2 to 20 degrees.

### Claim 10 (depends on 1)

The exhaust gas recirculation ejector system of claim 1 wherein a terminal point of the second end of the EGR conduit is spaced from the inner diameter D1 in an amount of from 5 to 15 mm.

### Claim 11 (depends on 1)

The exhaust gas recirculation ejector system of claim 1 further including a slot formed through the air conduit and a rib formed on the second end of the EGR conduit, the rib positioned in the slot positioning the second end of the EGR conduit relative to the air conduit and preventing movement of the second end of the EGR conduit.

### Claim 12 (depends on 1)

The exhaust gas recirculation ejector system of claim 1 wherein a terminal end of the second end of the EGR conduit includes an angled face formed thereon wherein the angled face includes an angle B measured relative to a horizontal plane defined by a top surface of the second end of the EGR conduit and wherein 0°≤B≤45°.

### Claim 13

An exhaust gas recirculation ejector system for an engine comprising:
an air conduit coupled to an engine providing charge air to the engine, the air conduit including at least one bend formed therein, the at least one bend including a port formed therein;
an EGR conduit coupled to an exhaust manifold of the engine at a first end of the EGR conduit;
a second end of the EGR conduit passing through the port and extending into the air conduit at the bend wherein a terminal point of the second end of the EGR conduit is spaced from the inner diameter D1 in an amount of from 5 to 15 mm defining an ejector mixing the charge air and exhaust gas before entry into the engine.

### Claim 14 (depends on 13)

The exhaust gas recirculation ejector system of claim 13 wherein the air conduit includes an inner radius R1 and the EGR conduit includes an inner radius R2 and a ratio of R1/R2 is from 2.5 to 2.9.

### Claim 15 (depends on 13)

The exhaust gas recirculation ejector system of claim 13 wherein the air conduit includes an inner diameter D1 and the EGR conduit includes an inner diameter D2 and wherein D2 is at 2.23 times smaller relative to D1.

### Claim 16 (depends on 13)

The exhaust gas recirculation ejector system of claim 13 wherein the charge air includes an outlet flow path and the second end of the EGR conduit passes through the port and includes an inlet flow path and wherein an angle A defined by an angle between the outlet flow path and the inlet flow path is from 2 to 20 degrees.

### Claim 17 (depends on 13)

The exhaust gas recirculation ejector system of claim 13 further including a slot formed through the air conduit and a rib formed on the second end of the EGR conduit, the rib positioned in the slot positioning the second end of the EGR conduit relative to the air conduit and preventing movement of the second end of the EGR conduit.

### Claim 18 (depends on 13)

The exhaust gas recirculation ejector system of claim 13 wherein a terminal end of the second end of the EGR conduit includes an angled face formed thereon wherein the angled face includes an angle B measured relative to a horizontal plane defined by a top surface of the second end of the EGR conduit and wherein 0°≤B≤45°.

### Claim 19

An exhaust gas recirculation ejector system for an engine comprising:
an air conduit coupled to an engine providing charge air to the engine, the air conduit including at least one bend formed therein, the at least one bend including a port formed therein;
an EGR conduit coupled to an exhaust manifold of the engine at a first end of the EGR conduit;
a second end of the EGR conduit passing through the port and extending into the air conduit at the bend wherein the charge air includes an outlet flow path and the second end of the EGR conduit passes through the port and includes an inlet flow path and wherein an angle A defined by an angle between the outlet flow path and the inlet flow path is from 5 to 20 degrees defining an ejector mixing the charge air and exhaust gas before entry into the engine.