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Electrically heated catalyst

An electric heating type, catalyst technology, applied in the direction of machine/engine, mechanical equipment, engine components, etc., can solve the problem of EHC exhaust gas purification ability reduction and other problems, and achieve the effect of suppressing short circuit

Inactive Publication Date: 2013-05-01
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 of causing a decrease in the exhaust purification ability of EHC

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] [Outline structure of EHC]

[0035] figure 1 It is a diagram showing a schematic configuration of an electrically heated catalyst (EHC) according to the present example. The EHC 1 according to this 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 using a hybrid system including an electric motor.

[0036] figure 1 It is a cross-sectional view of the EHC 1 cut along the central axis A of the exhaust pipe 2 of the internal combustion engine in the longitudinal direction. In addition, since the shape of EHC1 is line-symmetric with respect to the central axis A, in figure 1 In FIG. 2 , only the upper side of EHC1 is shown for convenience.

[0037] The EHC 1 according to this example includes a catalyst carrier 3 , a case 4 , a gasket 5 , an inner tube 6 , an...

Embodiment 2

[0058] [Outline structure of EHC]

[0059] image 3 It is an enlarged view of a portion forming the electrode chamber of the EHC according to the present example. Such as image 3 As shown, in this embodiment, the portion 4e that forms the wall surface of the electrode chamber 9 and the portion 4e that forms the through hole 4d through which the shaft portion 7b of the electrode 7 passes in the housing portion 4a of the housing 4 is formed as compared to The other part of the accommodating part 4a of the housing 4 has a convex shape protruding outward (hereinafter, this part is referred to as a convex shape part).

[0060] In the present embodiment, as in the first embodiment, the support member 8 extends from the through-hole 4 d of the case 4 to a position capable of receiving radiant heat and radiated heat from the catalyst carrier 3 . In addition, the convex shape part 4e is formed so that the distance L1 between the inner side wall surface of the convex shape part 4e a...

Embodiment 3

[0068] [Outline structure of EHC]

[0069] Figure 5 It is an enlarged view of a portion forming the electrode chamber of the EHC according to the present example. Such as Figure 5 As shown, in this embodiment, the part of the supporting member 8 that protrudes into the electrode chamber 9 has a cone in which the cross-sectional area in the direction perpendicular to the axial direction of the shaft portion 7b of the electrode 7 becomes smaller as it goes toward the front end. shape. That is, the cross-sectional area of ​​the support member 8 in a direction perpendicular to the axial direction of the shaft portion 7b of the electrode 7 is smaller at the portion close to the catalyst carrier 3 than the portion close to the inner wall surface of the case 4. . Other configurations are the same as those of the EHC according to Example 1.

[0070] [Action and effect of the structure of the EHC according to the present embodiment]

[0071] According to the present embodiment,...

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Abstract

The purpose of the present invention is to suppress short-circuiting between an electrode and a case of an electrically heated catalyst (EHC). In the EHC of the present invention, an electrode (7) is connected to a heat generating body (3) via a through-hole formed in a case (4) and an electrode chamber (9) formed between the inner wall surface of the case (4) and the outer peripheral surface of the heat generating body (3). A support member (8), which is formed from an electrical insulation material and supports the electrode (7) in the through-hole formed in the case (4), extends along the electrode (7) up to the interior of the electrode chamber (9).

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 provided 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 by energization has been developed. [0003] In the EHC, an insulating member for electrical insulation is provided between a heat generating element that generates heat due to energization and a case housing the heat generating element. For example, Patent Document 1 discloses a technique in which, in EHC, a gasket of an insulator is provided between a carrier that generates heat due to energization and a case that accommodates the carrier. By providing such an insulating member, it is possible to suppress a short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/24
CPCF01N3/2013F01N3/2026Y02T10/26Y02T10/12
Inventor 吉冈卫渡边刚
Owner TOYOTA JIDOSHA KK
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