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Exhaust gas recirculation unit for internal combustion engine

A technology for exhaust gas recirculation and internal combustion engines, which is applied to exhaust devices, exhaust gas recirculation, internal combustion piston engines, etc., and can solve problems such as increased cost, increased number of components, and increased size of EGR devices

Inactive Publication Date: 2009-12-16
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, the number of parts increases, causing new problems such as an increase in size and cost of the EGR device

Method used

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  • Exhaust gas recirculation unit for internal combustion engine
  • Exhaust gas recirculation unit for internal combustion engine
  • Exhaust gas recirculation unit for internal combustion engine

Examples

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Embodiment Construction

[0023] Refer below figure 1 and figure 2 An exhaust gas recirculation device (hereinafter referred to as an EGR device) 10 according to an embodiment of the present invention will be described.

[0024] Such as figure 1 As shown in , the exhaust pipe 20 includes an exhaust manifold 22 .

[0025] The exhaust manifold 22 is a manifold having a branch pipe portion 22a including branch pipes 22a1 to 22a4 and a connection portion 22b to which the branch pipes 22a1 to 22a4 are connected. The exhaust manifold 22 introduces exhaust gas into the downstream side of the exhaust pipe 20 from a combustion chamber of an internal combustion engine not shown. In this embodiment, the exhaust manifold 22 is made of iron-based material. A turbocharger, not shown, is connected to a location downstream of the exhaust pipe 22 .

[0026] Such as figure 1 As shown in , the EGR device 10 includes an exhaust gas recirculation pipe (hereinafter referred to as an EGR pipe) 12 , a catalyst portion ...

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PUM

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Abstract

An exhaust gas recirculation unit (10) has a catalyst portion (14) removing hydrocarbon by oxidation in an exhaust gas recirculation pipe (12) recirculating exhaust gas from an internal combustion engine into an intake pipe. The catalyst portion (14) is provided in contact with an external surface of an exhaust pipe (20) of the internal combustion engine.

Description

[0001] This non-provisional application is based on Japanese Patent Application No. 2005-073080 filed with Japan Patent Office on March 15, 2005, the entire contents of which are incorporated herein by reference. technical field [0002] The invention relates to an exhaust gas recirculation device for an internal combustion engine. Background technique [0003] An exhaust gas recirculation device (hereinafter referred to as an EGR device) is known to recirculate exhaust gas discharged from a combustion chamber of an internal combustion engine to an exhaust pipe into an intake pipe to suppress a rise in combustion temperature, thereby reducing Devices for nitrogen oxides in exhaust. When such an EGR device is employed, an increase in combustion temperature can be suppressed, and formation of nitrogen oxides can be reduced. On the other hand, the amount of unburned hydrocarbons contained in the exhaust gas increases, and the hydrocarbons are deposited on components of the EGR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M25/07F01N3/24F01N3/28
CPCY02T10/121F02M25/074F02M25/0717F02M25/0727F02M25/0747F02M26/14F02M26/23F02M26/35F02M26/41
Inventor 户田忠司
Owner TOYOTA JIDOSHA KK