Exhaust purification device of compression ignition type internal combustion engine
US7181904B2 · kind B2 · utility
4Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2004 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Nov 12, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An SOx trap catalyst (11) able to trap SOx contained in exhaust gas is arranged in an engine exhaust passage upstream of an NOx storing catalyst (12). When the SOx trap rate by the SOx trap catalyst (11) falls, the air-fuel ratio of the exhaust gas flowing into the SOx trap catalyst (11) is maintained lean and in that state the SOx trap catalyst (11) is raised in temperature. The SOx trapped at that time diffuses inside the SOx trap catalyst (11), whereby the SOx trap rate is restored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.