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Electrically heated catalyst

An electric heating and catalyst technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of insulation resistance drop and achieve the effect of suppressing the drop of insulation resistance

Inactive Publication Date: 2013-04-10
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the humidity in the electrode chamber rises due to such water vapor, there is a concern that the insulation resistance between the electrode in the electrode chamber and the container will drop significantly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (Brief structure of EHC)

[0039] figure 1 It is a figure which shows the schematic structure of the electrically heated catalyst (EHC) which concerns on this Example. The EHC 1 according to this embodiment is installed on 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 applied to a vehicle employing a hybrid system including an electric motor.

[0040] 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, since the shape of EHC1 is line-symmetric with respect to the central axis A, for convenience, in figure 1 Only the upper part of EHC1 is shown in .

[0041] The EHC 1 according to this embodiment includes a catalyst carrier 3 , a container 4 , a gasket 5 , an inner tube 6 , an electrod...

Embodiment 2

[0058] (Brief structure of EHC)

[0059] figure 2 It is a figure which shows the schematic structure of the EHC concerning this Example. In this embodiment, a temperature sensor 21 for detecting the temperature in the electrode chamber 9 is provided on the EHC 1 . The detected value of the temperature sensor 21 is input to an electronic control unit (ECU) 20 . Furthermore, a ventilation control valve 11 is provided on the ventilation passage 10 . The ventilation control valve 11 is controlled by the ECU 20 . If the ventilation control valve 11 is opened, the ventilation passage 10 is opened; if the ventilation control valve 11 is closed, the ventilation passage 10 is disconnected. The structure other than that is the same as that of the EHC related to Example 1. In addition, in this embodiment, the temperature sensor 21 corresponds to the temperature acquisition part concerning this invention. However, the ECU 20 can also calculate the amount of heat supplied to the ele...

Embodiment 3

[0069] (Brief structure of EHC)

[0070] Figure 4 It is a figure which shows the schematic structure of the EHC concerning this Example. In this embodiment, as shown in Embodiment 1, the ventilation passage is directly connected to the electrode chamber 9 . In this embodiment, the ventilation passage 12 is connected to a portion where the gasket 5 is located on the upstream side of the electrode chamber 9 . The structure other than that is the same as that of the EHC related to Example 1.

[0071] (Effect of the structure of the EHC related to this embodiment)

[0072] Figure 4 In , the arrows also indicate the flow of exhaust gas, condensed water, and water vapor generated by the evaporation of condensed water. According to the present embodiment, by ventilating through the ventilation passage 12 , water vapor and exhaust gas entering the gasket 5 along the flow of the exhaust gas from the upstream side are introduced into the ventilation passage 12 before reaching the...

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PUM

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Abstract

The purpose of the present invention is to suppress reduction in insulation resistance between an electrode and a case in an electrically heated catalyst (EHC). The EHC (1) of the present invention is provided with a heating element (3) that is heated by conduction and heats a catalyst; a case (4) that accommodates the heating element; an insulating member (5) that is provided between the heating element (3) and the case (4) and insulates against electricity; an electrode (7) connected to the heating element (3) via an electrode chamber (9) that is a space positioned between an inner wall surface of the case (4) and the outer peripheral surface of the heating element (3); and a ventilation passage (10) that ventilates the electrode chamber.

Description

technical field [0001] The present invention relates to an electrically heated catalyst provided on an exhaust passage of an internal combustion engine. Background technique [0002] Conventionally, an electric heating catalyst (Electric Heating Catalyst: hereinafter referred to as EHC) has been developed as an exhaust gas purification catalyst installed in an exhaust passage of an internal combustion engine. [0003] In the EHC, an insulating member for electrically insulating is provided between a heat generating element that generates heat by energization and a container that accommodates the heat generating element. For example, Patent Document 1 discloses a technique in which a gasket of an insulator is provided between a carrier of an EHC that generates heat by energization and a container that accommodates the carrier. By providing such an insulating member, it is possible to suppress short-circuiting between the heating element and the container. [0004] Patent Do...

Claims

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Application Information

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IPC IPC(8): F01N3/20B01J37/34F01N3/24
CPCF01N3/2026F01N3/2853F01N2240/16F01N2470/08F01N3/2871F01N3/2013Y02T10/12B01J35/33
Inventor 熊谷典昭吉冈卫高木直也
Owner TOYOTA JIDOSHA KK
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