Secondary air supply device for internal combustion engine

Inactive Publication Date: 2009-02-26
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]This invention provides a secondary air supply device for an internal combustion engine that prevents the entry of water into a catalyst.
[0015]Consequently, only the secondary air is supplied from the supply pump to the discharge pipe through the secondary air supply pipe and water is prevented from entering a high-temperature catalyst. As a result, damage of the catalyst and deterioration of catalyst performance may be prevented.

Problems solved by technology

Moreover, if the water comes into contact with the high-temperature catalyst carried on the honeycomb substrate of the catalytic device 4, the catalyst may be damaged, resulting in deterioration of catalyst performance.

Method used

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  • Secondary air supply device for internal combustion engine
  • Secondary air supply device for internal combustion engine
  • Secondary air supply device for internal combustion engine

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first embodiment

[0031]FIGS. 1 to 5 are diagrams showing a secondary air supply device for an internal combustion engine according to the invention.

[0032]The configuration of the secondary air supply device according to the first embodiment of the invention will now be described. As shown in FIG. 1, in an internal combustion engine 11 with four cylinders, the combustion chamber of each cylinder is communicated with an exhaust manifold 12 via an exhaust port. The exhaust manifold 12 is connected to an exhaust pipe 13 via a catalytic device 14.

[0033]The catalytic device 14 is configured by a product in which a main body case thereof accommodates a substance obtained by applying a catalyst such as platinum or palladium to a honeycomb substrate or a granular active alumina support. The catalytic device 14 reduces NOx or oxidizes CO and HC.

[0034]One end of a secondary air supply pipe 16 is connected to the exhaust manifold 12 via an electromagnetic air switching valve (ASV) 15 that controls opening and c...

second embodiment

[0072]As with the second embodiment, in this embodiment the air swirling on the inner peripheral surface of the casing 24 may be directed to collide with the projection 45e to create an air flow that is divided into upper and lower flows. Therefore, even if water reaches the secondary air discharge pipe 45 along with the air that is drawn from the air introduction port 21 into the casing 24, the amount of water entrained into the projection 45e may be reduced by the wall surface of the projection 45e.

[0073]In addition, because the communication hole 45c of the projection 45e is configured so that its diameter increases from the inner peripheral surface of the casing 24 toward the inside of the casing 24, a flow passage of the communication hole 45c on an upstream side in a secondary air lead-out direction may be made wider than a flow passage of the communication hole 45c on a downstream side in the secondary air lead-out direction.

[0074]Therefore, the speed of the air introduced i...

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Abstract

An air cleaner has: a main body that is provided with an air introduction part and an air lead-out part; a filter element is provided within the main body and is positioned between the air introduction part and the air lead-out part; and a secondary air discharge pipe that is provided in the main body and positioned apart from the air introduction port in relation to the direction of air flow within the main body.

Description

[0001]The disclosure of Japanese Patent Application No. 2007-217287 filed on Aug. 23, 2007 including the specification, drawings and abstract is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to a secondary air supply device for an internal combustion engine. In particular, the invention relates to a secondary air supply device for an internal combustion engine that supplies secondary air from an air cleaner to the portion of an exhaust pipe that is upstream of a catalyst provided in an exhaust pipe.[0004]2. Description of the Related Art[0005]In order to a catalyst appropriately purify exhaust gas discharged from an internal combustion engine mounted in a vehicle such as an automobile, the temperature of platinum, palladium or other catalytic component formed on a surface of a ceramic honeycomb substrate or the like needs to be raised to a predetermined activation temperature. Therefore, there ...

Claims

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Application Information

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IPC IPC(8): F01N3/00
CPCF01N3/303Y02T10/20F01N3/32Y02T10/12
InventorSUZUKI, HIDEKI
OwnerTOYOTA JIDOSHA KK