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Electrically Heated Catalyst

An electric heating type, catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as insulation resistance drop, and achieve the effect of suppressing insulation resistance drop.

Inactive Publication Date: 2016-07-06
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

An object of the present invention is to suppress a decrease in insulation resistance between an electrode and a container in an electrically heated catalyst (EHC). The EHC (1) related to the present invention is equipped with: a heating element (3), which generates heat and heats the catalyst by energization; a container (4), which accommodates the heating element; between the containers (4), and insulate electricity; the electrode (7), which is connected to the heating element (3) through the electrode chamber (9), the electrode chamber (9) is located on the inner wall of the container (4) and the heating The space between the outer peripheral surfaces of the body (3); the ventilation channel (10), which ventilates the above-mentioned 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, as an exhaust purification catalyst provided in an exhaust passage of an internal combustion engine, an electric heating catalyst (Electric Heating Catalyst: hereinafter referred to as EHC) that heats the catalyst with a heating element that generates heat by energization has been developed. [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 shor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20B01J37/34F01N3/24B01J35/00
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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