Exhaust purifying apparatus for internal combustion engine
US6393834B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2000 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | May 12, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In order to prevent degradation of an operational mode and a fuel consumption of an internal combustion engine at the time when raising the temperature of a catalyst poisoned NOx absorbent for removing the accumulated sulfur compounds, an exhaust purifying apparatus is provided in an exhaust pipe 22 connected to an internal combustion engine 11. The exhaust purifying apparatus comprises an air-fuel ratio controlling device for controlling the air-fuel ratio, and a fuel feeder for feeding fuel upstream of said nitrogen oxide absorbent; a temperature raising device for raising the temperature of the nitrogen oxide absorbent by feeding fuel by means of said fuel feeder, when the absorbing capability of the nitrogen oxide absorbent is catalyst poisoned by the accumulated sulfur compounds; and a restoring device for restoring the nitrogen oxide absorbing capability of said nitrogen oxide absorbent by controlling the air-fuel ratio so as to be made richer than the stoichiometric air-fuel ratio by said air-fuel ratio controlling device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.