Systems and methods for diagnosis of nox storage catalyst
US-2020095916-A1 · Mar 26, 2020 · US
Catalyst protection system from oxygen deprived exhaust
US11035282B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11035282-B2 |
| Application number | US-201815939492-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 29, 2018 |
| Priority date | Mar 31, 2017 |
| Publication date | Jun 15, 2021 |
| Grant date | Jun 15, 2021 |
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Abstract
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An exhaust purification system for the reduction of emissions from an exhaust stream, including an oxygen detection system; a catalyst; and an air injection system positioned between the oxygen detection system and the catalyst to inject air into the exhaust stream at designated exhaust conditions, to protect the catalyst from oxygen-deprived conditions.
First claim
Opening claim text (preview).
The invention claimed is: 1. An exhaust purification system for the reduction of emissions from an exhaust stream, comprising: a. an oxygen detection system; b. a catalyst; and c. an air injection system positioned between the oxygen detection system and the catalyst to inject air into the exhaust stream at designated exhaust conditions, to protect the catalyst from oxygen-deprived conditions; wherein the designated exhaust conditions comprise an exhaust stream oxygen level below a minimum oxygen level of about 10 wt % oxygen, and wherein the catalyst comprises a NOx storage catalyst, a cold start catalyst, or combinations thereof. 2. The system of claim 1 , wherein the oxygen detection system comprises an oxygen sensor. 3. The system of claim 1 , wherein the oxygen detection system is exhaust-mounted. 4. The system of claim 1 , wherein the oxygen detection system comprises a signal originating from an engine control unit. 5. The system of claim 1 , wherein the air injection system is operated to inject air upstream of the catalyst to prevent lambda ratios below about 1.1 within the catalyst. 6. A method of reducing emissions from an exhaust stream, comprising a. detecting an oxygen level in the exhaust stream upstream of a catalyst; b. injecting air upstream of the catalyst at designated exhaust conditions to protect the catalyst from oxygen-deprived conditions; wherein the air is injected to provide an oxygen level above about 10 wt % oxygen in the exhaust stream entering the catalyst, and wherein the catalyst is a NOx storage catalyst, a cold start catalyst, or combinations thereof. 7. The method of claim 6 , wherein the oxygen level is detected by an exhaust-mounted oxygen sensor. 8. The method of claim 6 , wherein the oxygen level is detected by a signal originating from an engine control unit. 9. The method of claim 6 , wherein the air is injected to provide a lean air-fuel ratio in the exhaust stream entering the catalyst. 10. The method of claim 6 , wherein the designated exhaust conditions comprise a rich air-fuel ratio. 11. The method of claim 6 , wherein the designated exhaust conditions comprise an exhaust stream oxygen level below a minimum oxygen level. 12. The method of claim 11 , wherein the minimum oxygen level comprises a level of oxygen above that required for complete combustion of all injected fuel into an engine and exhaust systems.
Assignees
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Classifications
using means for regenerating the filters, e.g. by burning trapped particles · CPC title
by catalytic processes · CPC title
Catalytic processes · CPC title
Electric control of additional air supply · CPC title
Mounting or arrangement of exhaust sensors in or on exhaust apparatus (sensor arrangements for engine control F02D41/1439) · CPC title
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- What does patent US11035282B2 cover?
- An exhaust purification system for the reduction of emissions from an exhaust stream, including an oxygen detection system; a catalyst; and an air injection system positioned between the oxygen detection system and the catalyst to inject air into the exhaust stream at designated exhaust conditions, to protect the catalyst from oxygen-deprived conditions.
- Who is the assignee on this patent?
- Johnson Matthey Plc
- What technology area does this patent fall under?
- Primary CPC classification F01N3/30. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jun 15 2021 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).