Heat exchangers of multiple cylinder internal combustion engine

• US 20030188728A1
• Filed: 11/06/2002
• Published: 10/09/2003
• Est. Priority Date: 01/21/2000
• Status: Active Grant

• 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
• Granted Patent: US 7,055,315 B2
• Time in Patent Office: Days
• US Class Current: 123/568.17
• 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. Furthermore, since the second heat exchanger (H1) is disposed in the section where the exhaust passages (33) are combined, the exhaust gas in which pulsations have disappeared as a result of the flows being combined can be made to act on the second heat exchanger (H1), thereby enhancing the heat exchange efficiency.

Claims

1. A heat exchanger for a multicylinder internal combustion engine, wherein a first heat exchanger (H2 to H4) is disposed in each exhaust passage (33) extending from a corresponding combustion chamber (16) of a multicylinder internal combustion engine (1), and a second heat exchanger (H1) is disposed in a section where at least two exhaust passages (33) are combined.

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

3. A heat exchanger for a multicylinder internal combustion engine according to claim 1 or claim 2, wherein the first heat exchanger (H2 to H4) and the second heat exchanger (H1) are integrated.

4. A heat exchanger for a multicylinder internal combustion engine according to any one of claims 1 to 3, wherein the second heat exchanger (H1) is disposed in a layer around an outer periphery of the first heat exchanger (H2 to H4).

5. A heat exchanger for a multicylinder internal combustion engine according to any one of claims 1 to 4, wherein a heat medium flows from the second heat exchanger (H1) to the first heat exchanger (H2 to H4).