Heat exchangers of multiple cylinder internal combustion engine

• US 7,055,315 B2
• Filed: 01/19/2001
• Issued: 06/06/2006
• Est. Priority Date: 01/21/2000
• Status: Expired due to Fees

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Takahashi, Tsutomu, Izumi, Hideharu, Endoh, Tsuneo, Shinohara, Masashi
• Primary Examiner(s): Denion, Thomas
• Assistant Examiner(s): TRAN, DIEM T
• Application Number:
  US10/181,558
• Publication Number:
  US 20030188728A1
• Time in Patent Office: 1,964 Days
• Field of Search: 602/98, 603/20, 603/02, 603/21, 165/156, 165/163, 123/41.52, 123/41.76, 123/41.82 R
• US Class Current: 60/320
• CPC Class Codes: F01N 2240/02 a heat exchanger
• CPC Class Codes: F01N 3/0205 using heat exchangers
• CPC Class Codes: F01N 3/2006 Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F01N 3/2046 Periodically cooling catalytic reactors
• CPC Class Codes: F01N 3/281 Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
• CPC Class Codes: F01N 3/2889 with heat exchangers in a single housing
• CPC Class Codes: F01N 5/02 the devices using heat
• CPC Class Codes: F01P 2060/16 Outlet manifold
• CPC Class Codes: F28D 7/02 the conduits being helically coiled F28D7/10 takes precedence F28D7/0016 and F28D7/0033 take precedence
• CPC Class Codes: F28D 7/08 the conduits being otherwise bent, e.g. in a serpentine or zig-zag F28D7/10 takes precedenceF28D7/0016 and F28D7/0033 take precedence
• CPC Class Codes: F28F 21/083 from stainless steel
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

First heat exchangers (H4, H3, H2) are disposed within an exhaust port (18), within a pre-catalytic device (34), and on the downstream of a main catalytic device (35); the exhaust port (18), the pre-catalytic device (34), and the main catalytic device (35) being provided in each exhaust passage (33) of a multicylinder internal combustion engine. These first heat exchangers (H4, H3, H2) are independently provided for each of the exhaust passages (33), and a second heat exchanger (H1) is disposed in a section where these exhaust passages (33) are combined. Since the first heat exchangers (H4, H3, H2) are disposed on the upstream side of the exhaust passage (33), high heat exchange efficiency can be obtained by high temperature exhaust gas, and, moreover, the occurrence of exhaust interference can be avoided, thereby preventing any decrease in the output of the internal combustion engine.

Claims

1. A heat exchanger for a multicylinder internal combustion engine having a plurality of cylinders and exhaust passages extending from respective cylinders, comprising:

a first heat exchanger (H2 to H4) disposed inside each of said exhaust passages (33) extending from a corresponding combustion chamber (16) of the multicylinder internal combustion engine (1) toward an exhaust pipe (32) at a location downstream from an exhaust valve (25), and

a second heat exchanger (H1) disposed inside a section where at least two of the exhaust passages (33) extending from respective combustion chambers are combined such that said at least two exhaust passages communicate with said section and exhaust gases from the respective combustion chambers flow through said at least two exhaust passages, respectively, and then through said section,

wherein at said section, the exhaust gases are combined into a non-pulsed flow free from exhaust interference.

2. The heat exchanger according to claim 1, wherein the first heat exchanger (H2 to H4) positioned on an upstream side of the flow of the exhaust gas and the second heat exchanger (H1) positioned on a downstream side communicate with each other.

3. The heat exchanger according to claim 1, wherein the first heat exchanger (H2 to H4) and the second heat exchanger (H1) are integrated.

4. The heat exchanger according to claim 1, wherein the second heat exchanger (H1) is disposed in a layer around an outer periphery of the first heat exchanger (H2 to H4).

5. The heat exchanger according to claim 1, wherein the flow of the exhaust gas exiting from the first heat exchanger (H2 to H4) changes direction by 1800 before entering the second heat exchanger (H1).

6. The heat exchanger according to claim 1, wherein a flow of exhaust gas is from front-to-back in one portion of the first heat exchanger (H2 to H4) and is from back-to-front in another portion of the first heat exchanger (H2 to H4), the one portion and the another portion being separate from each other.

7. A heat exchanger for a multicylinder internal combustion engine, comprising:

a first heat exchanger (H2 to H4) disposed in each exhaust passage (33) extending from a corresponding combustion chamber (16) of the multicylinder internal combustion engine (1) toward an exhaust pipe (32) at a location downstream from an exhaust valve (25), and

a second heat exchanger (H1) disposed in a section where at least two exhaust passages (33) are combined,

wherein a heat medium flows from the second heat exchanger (H1) to the first heat exchanger (H2 to H4).

8. The heat exchanger for a multicylinder internal combustion engine according to claim 7, wherein the first heat exchanger (H2 to H4) positioned on an upstream side of a flow of exhaust gas and the second heat exchanger (H1) positioned on a downstream side communicate with each other.

9. The heat exchanger for a multicylinder internal combustion engine according to claim 7, wherein the first heat exchanger (H2 to H4) and the second heat exchanger (H1) are integrated.

10. The heat exchanger for a multicylinder internal combustion engine according to claim 7, wherein the second heat exchanger (H1) is disposed in a layer around an outer periphery of the first heat exchanger (H2 to H4).

11. The heat exchanger for a multicylinder internal combustion engine according to claim 7,

wherein the first heat exchanger is a plurality of first exchangers each one being disposed inside one of said exhaust passages, and the second heat exchanger extends across said section where at least two of said exhaust passages are combined.

12. A heat exchanger for a multicylinder internal combustion engine having a plurality of cylinders and exhaust passages extending from respective cylinders, comprising:

a first heat exchanger (H2 to H4) disposed in each of said exhaust passages (33) extending from a corresponding combustion chamber (16) of the multicylinder internal combustion engine (1), and

a second heat exchanger (H1) disposed in a section where at least two of the exhaust passages (33) are combined,

wherein at least a part of said first heat exchanger (H2 to H4) is housed inside a cylinder head (12) of the engine such that said at least two exhaust passages communicate with said section and exhaust gases from the respective combustion chambers flow through said at least two exhaust passages, respectively, and then through said section,

wherein at said section, the exhaust gases are combined into a non-pulsed flow free from exhaust interference.

13. The heat exchanger according to claim 12, wherein the first heat exchanger (H2 to H4) positioned on an upstream side of a flow of exhaust gas and the second heat exchanger (H1) positioned on a downstream side communicate with each other.

14. The heat exchanger according to claim 12, wherein the first heat exchanger (H2 to H4) and the second heat exchanger (H1) are integrated.

15. The heat exchanger according to claim 12, wherein the second heat exchanger (H1) is disposed in a layer around an outer periphery of the first heat exchanger (H2 to H4).

16. The heat according to claim 12,

wherein the first heat exchanger is a plurality of first exchangers each one being disposed inside one of said exhaust passages, and the second heat exchanger extends across said section where at least two of said exhaust passages are combined.

17. The heat exchanger according to claim 12, wherein a flow of exhaust gas is from front-to-back in one portion of the first heat exchanger (H2 to H4) and is from back-to-front in another portion of the first heat exchanger (H2 to H4), the one portion and the another portion being separate from each other.

18. A heat exchanger for a multicylinder internal combustion engine, comprising:

a first heat exchanger (H2 to H4) disposed in each exhaust passage (33) extending from a corresponding combustion chamber (16) of the multicylinder internal combustion engine (1) toward an exhaust pipe (32) at a location downstream from an exhaust valve (25), and

a second heat exchanger (H1) disposed in a section where at least two of the exhaust passages (33) are combined, wherein at least a part of said first heat exchanger (H2 to H4) is housed inside a cylinder head (12) of the engine, and

wherein a heat medium flows from the second heat exchanger (H1) to the first heat exchanger (H2 to H4).

19. The heat exchanger for a multicylinder internal combustion engine according to claim 18, wherein the first heat exchanger (H2 to H4) positioned on an upstream side of a flow of exhaust gas and the second heat exchanger (H1) positioned on a downstream side communicate with each other.

20. The heat exchanger for a multicylinder internal combustion engine according to claim 18, wherein the first heat exchanger (H2 to H4) and the second heat exchanger (H1) are integrated.

21. The heat exchanger for a multicylinder internal combustion engine according to claim 18, wherein the second heat exchanger (H1) is disposed in a layer around an outer periphery of the first heat exchanger (H2 to H4).

22. The heat exchanger for a multicylinder internal combustion engine according to claim 18,

wherein the first heat exchanger is a plurality of first exchangers each one being disposed inside one of said exhaust passages, and the second heat exchanger extends across said section where at least two of said exhaust passages are combined.