Exhaust gas purifying apparatus

a technology of exhaust gas purification and purification chamber, which is applied in the direction of exhaust treatment electric control, machines/engines, separation processes, etc., can solve the problems of increasing the amount, the catalyst placed in the exhaust gas purification apparatus does not adequately reach the optimum temperature, and it is difficult to use a usual ceramic support. , to achieve the effect of efficiently eliminating specified materials, increasing the size of the exhaust gas purifying apparatus, and rapid increase of the catalyst temperatur
US20090183496A1Inactive Publication Date: 2009-07-23DENSO CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
DENSO CORP
Publication Date
2009-07-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

A throttle unit placed in an exhaust gas passage controls an opening-ratio of each of first and second valve members to control a gas-flow sectional area of the exhaust gas passage. When the temperature of a three-way catalyst is low, the throttle unit introduces the exhaust gas flow into a part of an outer-periphery of the three-way catalyst. This control can rapidly increase the temperature of the three-way catalyst from an early period of starting an internal combustion engine within a short period of time. The throttle unit increases the gas-flow sectional area of the exhaust gas passage according to increasing the temperature of the three-way catalyst. When the three-way catalyst reaches its activation temperature, the throttle unit instructs the first and second valve members to fully open. This decreases a pressure loss of the exhaust gas because the exhaust gas is supplied into the entire of the three-way catalyst.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application is related to and claims priority from Japanese Patent Application No. 2008-8305 filed on Jan. 17, 2008, the contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to an exhaust gas purifying apparatus using a catalyst such as a three way catalyst capable of purifying an exhaust gas emitted from an internal combustion engine such as a diesel engine under a low temperature of the catalyst in the early period of starting the internal combustion engine.

[0004] 2. Description of the Related Art

[0005] Internal combustion engines such as diesel engines and gasoline engines include a problem of increasing the amount of specified materials such as hydro carbon (HC), carbon monoxide (CO), and nitrogen oxide (NOx) contained in an exhaust gas emitted from such an internal combustion engine mounted to a vehicle when the temperature of catalyst p...

Claims

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