Device for reactivating catalyst of engine
US6178743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1998 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Jul 31, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst is housed in a casing arranged in the exhaust passage of the engine. A pressure reducing valve, which is usually closed, is arranged in a bypass passage branching off from the exhaust passage upstream of the casing. The fuel injector usually injects fuel at the combustion stroke or the exhaust stroke to feed hydrocarbon, and NO.sub.X is reduced in the catalyst by the hydrocarbon. When the catalyst is judged to be poisoned, the timing of the secondary fuel injection is advanced with respect to the timing of the usual secondary fuel injection, and the pressure reducing valve is opened to reduce the pressure in the casing. In this way, the catalyst is reactivated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.