Exhaust gas purification device
US6233927A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1999 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Jul 27, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/30
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
According to the present invention, there is provided an exhaust gas purification device, comprising a NO.sub.x absorbent arranged in an exhaust passage of an engine for absorbing NO.sub.x therein when an air-fuel ratio of an exhaust gas flowing into the NO.sub.x absorbent is lean, the NO.sub.x absorbent discharging NO.sub.x absorbed therein when a concentration of the oxygen in the exhaust gas flowing into the NO.sub.x absorbent decreases, a trapping element arranged in the exhaust passage upstream of the NO.sub.x absorbent for trapping particulates, a processing element for processing the particulates trapped in the trapping element to regenerate the trapping element, and a preventing element for preventing the exhaust gas from flowing into the NO.sub.x absorbent from the trapping element when the trapping element is regenerated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.