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Electrically heated catalyst

An electric heating and catalyst technology, which is applied in chemical instruments and methods, separation methods, machines/engines, etc., can solve the problems of EHC exhaust purification ability reduction, and achieve the effect of suppressing the reduction of insulation resistance and the increase of humidity

Inactive Publication Date: 2014-09-17
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a concern that the exhaust gas purification capability of the EHC will be reduced

Method used

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  • Electrically heated catalyst
  • Electrically heated catalyst
  • Electrically heated catalyst

Examples

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Embodiment 1

[0021] [Brief structure of EHC]

[0022] figure 1 It is a figure showing the schematic structure of the electrically heated catalyst (EHC) which concerns on this Example. The EHC 1 according to the present embodiment is installed in an exhaust pipe of an internal combustion engine mounted on a vehicle. The internal combustion engine can be a diesel engine or a gasoline engine. Furthermore, the EHC 1 according to the present embodiment can also be used in a vehicle employing a hybrid system including an electric motor.

[0023] figure 1 It is a cross-sectional view of the EHC 1 cut longitudinally along the central axis A of the exhaust pipe 2 of the internal combustion engine. In addition, the shape of EHC 1 is line-symmetric with respect to the central axis A, therefore, figure 1 In , only the upper part of the EHC 1 is shown for convenience.

[0024] The EHC 1 according to this embodiment includes a catalyst carrier 3 , a case 4 , a mat 5 , an inner tube 6 , an electrod...

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PUM

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Abstract

An object of the present invention is to suppress a decrease in insulation resistance between an electrode and a case in an electrically heated catalyst (EHC). The EHC (1) according to the present invention includes: a heating element (3) that heats the catalyst by being energized to generate heat; a casing (4) that accommodates the heating element; ) between the insulating parts (5) for electrical insulation; through the space between the inner wall surface of the housing (4) and the outer peripheral surface of the heating element (3), that is, the electrode chamber (9) and the heating element (3) a connected electrode (7); and a communication path (10) that communicates the electrode chamber with a portion of an exhaust system of an internal combustion engine other than a portion where the EHC is installed.

Description

technical field [0001] The present invention relates to an electrically heated catalyst provided in an exhaust passage of an internal combustion engine. Background technique [0002] Conventionally, as an exhaust purification catalyst installed in an exhaust passage of an internal combustion engine, an electrically heated catalyst (Electrically Heated Catalyst: hereinafter referred to as EHC) in which the catalyst is heated by a heating element that generates heat when energized has been developed. [0003] In the EHC, an insulating member that electrically insulates is provided between a heat generating element that generates heat when energized and a case in which the heat generating element is accommodated. For example, Patent Document 1 discloses a technology in which, in EHC, a pad of an insulator is provided between a carrier that generates heat when energized and a case that accommodates the carrier. By providing such an insulating member, it is possible to suppress ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/94
CPCF01N3/2026Y02T10/26F01N3/2013F01N3/2871Y02T10/12
Inventor 渡边刚吉冈卫
Owner TOYOTA JIDOSHA KK
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