Method for operating an exhaust gas system, method for operating a motor vehicle and motor vehicle having the system
US-9217346-B2 · Dec 22, 2015 · US
Hydrocarbon and NOx trap
US8978360B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8978360-B2 |
| Application number | US-56003809-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 15, 2009 |
| Priority date | Sep 15, 2009 |
| Publication date | Mar 17, 2015 |
| Grant date | Mar 17, 2015 |
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Abstract
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A hydrocarbon and NOx trap and related apparatus and methods for reducing cold-start NOx emissions from an engine are provided. In one embodiment a trap includes a first, topmost layer, exposed to an exhaust gas flow path of exhaust gases from an engine, the first layer comprising a zeolite, a second layer, substantially covered by the topmost layer, the second layer comprising a NOx adsorbing material and a monolithic substrate, directly supporting the second layer and indirectly supporting the first layer, the substrate providing a substantially rigid structure of the trap. In this way, engine emissions, such as NOx and hydrocarbons may be adsorbed over the exhaust trap at low temperature and then thermally released, limiting cold start emissions beyond engines that only include a lean NOx trap.
First claim
Opening claim text (preview).
The invention claimed is: 1. An engine system, comprising: a catalytic converter in an exhaust conduit; a bypass conduit coupled in parallel with the exhaust conduit downstream of the catalytic converter; an exhaust trap in the bypass conduit, comprising: a first, topmost layer, exposed to an exhaust gas flow path of engine exhaust gases, comprising a zeolite; a second layer, covered by the first layer, comprising a NOx adsorbing material; and a monolithic substrate, dire…
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Cross-Sectional Technologies · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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- What does patent US8978360B2 cover?
- A hydrocarbon and NOx trap and related apparatus and methods for reducing cold-start NOx emissions from an engine are provided. In one embodiment a trap includes a first, topmost layer, exposed to an exhaust gas flow path of exhaust gases from an engine, the first layer comprising a zeolite, a second layer, substantially covered by the topmost layer, the second layer comprising a NOx adsorbing …
- Who is the assignee on this patent?
- Cavataio Giovanni, Lupescu Jason Aaron, Elwart Shane, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification F01N3/0807. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Mar 17 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).