# US 10,119,498 B2 · Enhanced long route EGR cooler arrangement with bypass

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- Number: US 10,119,498 B2
- Document ID: US10119498B2
- Status: Granted
- Kind: B2
- Application number: 15/421,796
- Filed: 2017-02-01
- Published: 2018-08-02
- Granted: 2018-11-06
- Earliest claimed: 2017-02-01
- Assignees: GM Global Technology Operations LLC
- Applicants: GM Global Technology Operations LLC
- Inventors: Cesare Maria Meano; Riccardo Baria; Andrea Tripodi
- Web page: https://patentgrep.com/patent/US10119498B2

## CPC

- F02M 26/25: with coolers having bypasses
- F02M 26/14: in relation to the exhaust system
- F02M 26/15: in relation to engine exhaust purifying apparatus
- F02M 26/24: with two or more coolers
- F02M 26/28: with liquid-cooled heat exchangers
- F02M 26/30: Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
- F02M 26/32: Liquid-cooled heat exchangers
- F02M 26/33: controlling the temperature of the recirculated gases
- F02M 26/35: with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

An internal combustion engine includes an air intake system in communication with a plurality of cylinders. An exhaust system is in communication with the plurality of cylinders. An EGR passage is in communication with the exhaust system and the air intake system. The EGR passage includes an EGR cooler with an EGR inlet end with a passage having a first portion extending in one direction in an assembled condition toward an intermediate section. The passage includes a second portion extending in an opposite direction from the intermediate section toward an EGR outlet end. A first cooler matrix is disposed in the first portion and a second, optional, cooler matrix disposed in the second portion. A thermally separated bypass channel is provided to allow a fast warm-up and guarantee the lowest possible pressure drop. The EGR cooler shape allows a compact packaging around the bypass pipe.

## Claims

### Claim 1

An internal combustion engine, comprising:
an engine structure including a plurality of cylinders;
an air intake system in communication with the plurality of cylinders;
an exhaust system in communication with the plurality of cylinders;
an EGR passage in communication with the exhaust system and the air intake system, said EGR passage including an EGR cooler with an EGR inlet end with a passage having a vertically descending portion extending downward in an assembled condition in an exhaust system to an intermediate section downstream from the vertically descending portion;
the passage including a vertically ascending portion downstream from the intermediate section and extending upward from the intermediate section toward an EGR outlet end; and
a first cooler matrix disposed in the vertically descending or vertically ascending portions,
wherein the intermediate section is in direct contact with the exhaust system.

### Claim 2 (depends on 1)

The internal combustion engine according to claim 1, wherein a second cooler matrix is disposed in the other of the vertically descending and vertically ascending portions.

### Claim 3

An internal combustion engine, comprising:
an engine structure including a plurality of cylinders;
an air intake system in communication with the plurality of cylinders;
an exhaust system in communication with the plurality of cylinders;
an EGR passage in communication with the exhaust system and the air intake system, said EGR passage including an EGR cooler with an EGR inlet end with a passage having a vertically descending portion extending downward in an assembled condition in an exhaust system to an intermediate section downstream from the vertically descending portion;
the passage including a vertically ascending portion downstream from the intermediate section and extending upward from the intermediate section toward an EGR outlet end; and
a first cooler matrix disposed in the vertically descending or vertically ascending portions,
wherein the intermediate section is in direct contact with an aftertreatment system of the exhaust system.

### Claim 4 (depends on 3)

The internal combustion engine according to claim 3, wherein the passage has a V-shape.

### Claim 5

An internal combustion engine, comprising:
an engine structure including a plurality of cylinders;
an air intake system in communication with the plurality of cylinders;
an exhaust system in communication with the plurality of cylinders;
an EGR passage in communication with the exhaust system and the air intake system, said EGR passage including an EGR cooler with an EGR inlet end with a passage having a vertically descending portion extending downward in an assembled condition in an exhaust system to an intermediate section downstream from the vertically descending portion;
the passage including a vertically ascending portion downstream from the intermediate section and extending upward from the intermediate section toward an EGR outlet end; and
a first cooler matrix disposed in the vertically descending or vertically ascending portions,
further comprising a bypass pipe connected to the EGR passage to bypass the EGR cooler.

### Claim 6 (depends on 5)

The internal combustion engine according to claim 5, wherein the bypass pipe is disposed between the EGR inlet end and the EGR outlet end of the EGR cooler.