# US 8,784,741 B2 · Electrically-heated catalytic converter

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- Number: US 8,784,741 B2
- Document ID: US8784741B2
- Status: Granted
- Kind: B2
- Application number: 13/638,776
- Filed: 2010-04-06
- Published: 2013-01-31
- Granted: 2014-07-22
- Earliest claimed: 2010-04-06
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Mamoru Yoshioka; Noriaki Kumagai; Naoya Takagi; Tatsuo Iida; Yasuo Kinoshita
- Inventors: Mamoru Yoshioka; Noriaki Kumagai; Naoya Takagi; Tatsuo Iida; Yasuo Kinoshita
- Web page: https://patentgrep.com/patent/US8784741B2

## CPC

- F01N 3/2026: {directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect}
- F01N 3/2853: {using mats or gaskets between catalyst body and housing}
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An electrically-heated catalytic converter comprises a catalyst support which produces heat when electric current is applied, a holding mat made of an electrical insulating material, the holding mat being provided so as to cover an outer circumference of the catalyst support, and a case which houses the catalyst support and holds the catalyst support via the holding mat. The catalytic converter treats gas flowing in the case by a catalyst supported on the catalyst support. The holding mat has a water-absorbing property. An insulation layer made of an electrical insulating material is provided between the case and the holding mat.

## Claims

### Claim 1

An electrically-heated catalytic converter comprising a catalyst support which produces heat when electric current is applied, a holding member made of an electrical insulating material, the holding member being provided so as to cover an outer circumference of the catalyst support, and a case which houses the catalyst support and holds the catalyst support via the holding member, wherein
gas flowing in the case is treated by a catalyst supported on the catalyst support, wherein
the holding member has a water-absorbing property, and
an insulation layer made of an electrical insulating material including glass components is provided between the case and the holding member,
the case is provided with a water interception member which has penetrating hole which the gas passes through and is located on an upper stream side of a gas flow direction than the catalyst support so as to hide the holding member when an inside of the case is viewed from the upper stream side of the gas flow direction, and
the water interception member is located away from the catalyst support, the holding member, and the insulation layer.

### Claim 2 (depends on 1)

The electrically-heated catalytic converter according to claim 1, wherein
a water absorption layer made of a material having a water-absorbing property is provided between the catalyst support and the holding member.

### Claim 3 (depends on 2)

The electrically-heated catalytic converter according to claim 2, wherein
the water absorption layer has a higher water absorbing property than the holding member.

### Claim 4 (depends on 3)

The electrically-heated catalytic converter according to claim 3, wherein
the catalyst support is made of silicon carbide.

### Claim 5 (depends on 2)

The electrically-heated catalytic converter according to claim 2, wherein
the catalyst support is made of silicon carbide.

### Claim 6 (depends on 1)

The electrically-heated catalytic converter according to claim 1, wherein
the water interception member is made of a material having a water-absorbing property.

### Claim 7 (depends on 6)

The electrically-heated catalytic converter according to claim 6, wherein
the catalyst support is made of silicon carbide.

### Claim 8 (depends on 1)

The electrically-heated catalytic converter according to claim 1, wherein
the catalyst support is made of silicon carbide.