CATALYST BODY, ELECTRICALLY HEATED CATALYST, MOTOR VEHICLE WITH CATALYST AND METHOD FOR PRODUCING A CATALYST

• US 20200131965A1
• Filed: 10/29/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Faurecia Emissions Control Technologies Germany GmbH (Forvia SE)
• Original Assignee: Faurecia Emissions Control Technologies Germany GmbH (Forvia SE)
• Inventors: Stiglmair, Manfred, Boehmer, Axel, Feng, Ting, Hildebrand, Matthias, Perret, Jean-Francois
• Granted Patent: US 10,731,534 B2
• Time in Patent Office: Days
• CPC Class Codes: F01N 13/1855 the connection being realised by using bolts, screws, rivets or the like
• CPC Class Codes: F01N 2450/16 by using threaded joints
• CPC Class Codes: F01N 2450/24 by bolts, screws, rivets or the like
• CPC Class Codes: F01N 2510/00 Surface coverings
• CPC Class Codes: F01N 3/2026 directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
• CPC Class Codes: F01N 3/28 Construction of catalytic reactors
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An electrically heated catalyst has a catalyst body and a housing at least circumferentially surrounding the catalyst body. An electrical contacting assembly is arranged on a shell surface of the catalyst body, the electrical contacting assembly comprising a surface electrode arranged directly on the catalyst body and a contacting element connected to the surface electrode. The contacting element is rigid and has a screw thread.

Claims

1. A catalyst body for an electrically heated catalyst:

at least one electrical contacting assembly arranged on a shell surface of the catalyst body, the at least one electrical contacting assembly comprising a surface electrode arranged directly on the catalyst body and a rigid contacting element connected to the surface electrode, wherein the contacting element has a screw thread.

2. The catalyst body according of claim 1 wherein the rigid contacting element is arranged directly on the surface electrode.

3. The catalyst body according of claim 1 wherein the catalyst body has a depression and the rigid contacting element is arranged in the depression in such a way that the rigid contacting element does not protrude beyond an outer surface of the catalyst body.

4. The catalyst body of claim 1 wherein the rigid contacting element is adhered to the surface electrode.

5. The catalyst body of claim 1 wherein the rigid contacting element is secured to a contact element, in particular a flexible contact element, wherein the flexible contact element is arranged on the surface electrode.

6. The catalyst body of claim 1 wherein the rigid contacting element is a nut.

7. An electrically heated catalyst with the catalyst body of claim 1 and a housing at least circumferentially surrounding the catalyst body, and wherein a screw is screwed into the rigid contacting element for electrically contacting the electrically heated catalyst.

8. The electrically heated catalyst of claim 7 wherein the rigid contacting element is arranged completely inside the housing.

9. The electrically heated catalyst of claim 7 wherein at least one opening is provided in the housing, wherein the at least one opening is arranged over the rigid contacting element in such a way that the rigid contacting element is accessible via the at least one opening.

10. The electrically heated catalyst of claim 9 wherein a cover is arranged over the at least one opening, in particular wherein the cover is held on the catalyst body by the screw.

11. The electrically heated catalyst of claim 7 wherein the catalyst body is surrounded by an insulating mat.

12. A motor vehicle with the electrically heated catalyst of claim 7.

13. A method for producing the electrically heated catalyst as defined in claim 7, comprising the following steps:

providing the catalyst body as a cylindrical catalyst body, wherein the at least one electrical contacting assembly with the rigid contacting element is arranged on the shell surface of the catalyst body,

the catalyst body is wrapped into an insulating mat, wherein the insulating mat comprises openings and wherein the insulating mat is arranged in such a way that the rigid contacting element is not covered by the insulating mat,

the catalyst body is encased, with the insulating mat, in a housing, the housing having at least one opening which is aligned in such a way that the rigid contacting element is accessible via the at least one opening, and

once the catalyst body is encased, the rigid contacting element is electrically contacted.

14. A method for producing the electrically heated catalyst as defined in claim 7, comprising the following steps:

providing the catalyst body as a cylindrical catalyst body, wherein at least one surface electrode is arranged on the shell surface of the catalyst body,

the catalyst body is wrapped in an insulating mat, wherein the insulating mat comprises at least one opening and wherein the insulating mat is arranged in such a way that the at least one surface electrode is partially exposed,

the catalyst body is encased, with the insulating mat, in a housing, wherein the housing has at least one opening which is aligned in such a way that the at least one opening of the insulating mat and the at least one opening of the housing lie one on top of the other, and

once the catalyst body is encased, a contact element is secured to the surface electrode, wherein the rigid contacting element with the screw thread is arranged on the contact element.