Electric heating catalyst

Inactive Publication Date: 2013-11-28
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a way to prevent electricity from flowing through the case of an electric heating catalyst. This helps to improve the efficiency of the device.

Problems solved by technology

However, when the particulate matter (PM) contained in an exhaust gas adheres to the mat, it is feared that the electricity may flow through the case by the aid of PM.
If the water adheres to the mat, it is feared that the electricity may flow through the case by the aid of the water.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0049]FIG. 1 shows a schematic arrangement of an electric heating catalyst 1 according to a first embodiment of the present invention. The electric heating catalyst 1 according to this embodiment is provided for an exhaust tube 2 of an internal combustion engine carried on a vehicle. The internal combustion engine may be either a diesel engine or a gasoline engine. Further, the electric heating catalyst 1 can be also used for a vehicle which adopts a hybrid system provided with an electric motor.

[0050]The electric heating catalyst 1 shown in FIG. 1 is depicted in a sectional view obtained by cutting the electric heating catalyst 1 in the vertical direction along the central axis A of the exhaust tube 2. The shape of the electric heating catalyst 1 is linearly symmetric with respect to the central axis A. Therefore, only an upper part is shown in FIG. 1.

[0051]The electric heating catalyst 1 according to this embodiment comprises a columnar or cylindrical catalyst carrier 3 which has ...

second embodiment

[0066]FIG. 2 shows a schematic arrangement of an electric heating catalyst 10 according to a second embodiment of the present invention. An explanation will be made about the points or features different from those of the electric heating catalyst 1 shown in the first embodiment. The members, which are the same as those of the electric heating catalyst 1 shown in the first embodiment, are designated by the same reference numerals, any explanation of which will be omitted.

[0067]As for an inner tube 400 shown in FIG. 2, the thickness differs between the upstream side and the downstream side from the electrodes 7. That is, a plate thickness L3 of an upstream side inner tube 401 provided on the upstream side from the electrodes 7 is thicker than a plate thickness L4 of a downstream side inner tube 42 provided on the downstream side from the electrodes 7.

[0068]In the electric heating catalyst 10 constructed as described above, the thermal capacity of the upstream side inner tube 401 is l...

third embodiment

[0071]FIG. 3 shows a schematic arrangement of an electric heating catalyst 11 according to a third embodiment of the present invention. An explanation will be made about the points or features different from those of the electric heating catalyst 10 shown in the second embodiment. The members, which are the same as those of the electric heating catalyst 10 shown in the second embodiment, are designated by the same reference numerals, any explanation of which will be omitted.

[0072]As for an inner tube 410 shown in FIG. 3, the thickness differs between the upstream side and the downstream side from the electrodes 7. That is, a plate thickness L3 of an upstream side inner tube 411 provided on the upstream side from the electrodes 7 is thicker than a plate thickness L4 of a downstream side inner tube 42 provided on the downstream side from the electrodes 7. Further, a thin-walled portion 414, in which the plate thickness of the upstream side inner tube 411 is thinned, is provided at a p...

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PUM

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Abstract

The electricity is suppressed from flowing through a case (5) of an electric heating catalyst (1). The electric heating catalyst (1) comprises a heat generating element (3) which generates heat by applying electricity; a case which accommodates the heat generating element (3); an inner tube (4) which is provided between the heat generating element (3) and the case (5); a mat (6) which is provided between the heat generating element (3) and the inner tube (4) and between the inner tube (4) and the case (5) and which insulates the electricity; and an electrode (7) which is connected to the heat generating element (3) and which supplies an electric power to the heat generating element (3); wherein the inner tube (4) protrudes from the mat (6) toward an upstream side and a downstream side in a flow direction of an exhaust gas; and a distance between the heat generating element (3) and the inner tube (41), which is provided on an upstream side from the electrode (7), is shorter than a distance between the heat generating element (3) and the inner tube (42) which is provided on a downstream side from the electrode (7).

Description

TECHNICAL FIELD[0001]The present invention relates to an electric heating catalyst.BACKGROUND ART[0002]A technique is known, in which a mat composed of an insulator is provided between a catalyst carrier which generates the heat by applying the electricity and a case which accommodates the catalyst carrier (see, for example, Patent Document 1). According to this mat, it is possible to suppress the electricity from flowing through the case when the electricity is applied to the catalyst carrier. However, when the particulate matter (PM) contained in an exhaust gas adheres to the mat, it is feared that the electricity may flow through the case by the aid of PM. On the other hand, water contained in an exhaust gas is sometimes condensed on a wall surface of an exhaust tube, for example, immediately after the startup of an internal combustion engine. If the water adheres to the mat, it is feared that the electricity may flow through the case by the aid of the water.[0003]Another techniq...

Claims

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Application Information

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IPC IPC(8): F01N3/20
CPCF01N3/2013F01N3/2026F01N3/2803F01N3/2853F01N2240/20F01N3/2871Y02T10/12
InventorYOSHIOKA, MAMORU
OwnerTOYOTA JIDOSHA KK