Exhaust gas purifying apparatus and method for controlling it
US7475533B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2005 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Nov 3, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides an exhaust gas purifying apparatus 10 which can effectively purify an exhaust gas with the use of a plasma. The present exhaust gas purifying apparatus 10 comprises a NOx purifying catalyst 1 disposed in an exhaust gas pipe 11 for an internal combustion engine (ENG); a plasma generator 2 for converting a gas into a plasma and supplying the plasma to the exhaust pipe at the upstream of the NOx purifying catalyst; a switching device 3 for selectively supplying one of a recirculated exhaust gas 13 and air 12 as a gas to be converted into a plasma to the plasma generator 2; and an injector 4 for adding a reducing agent to the gas 14 to be converted into a plasma or a plasma 15 converted from the gas by the plasma generator. The present invention further provides a method for controlling the exhaust gas purifying apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.