Exhaust purifying apparatus for an in-cylinder injection type internal combustion engine
US6173571A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1998 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Nov 9, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust purifying apparatus for an in-cylinder injection type internal combustion engine causes exhaust gas temperature to rise reliably, thereby desorbing reliably a sulfur component (SO.sub.x) adhered to an NO.sub.x catalyst and enhancing the durability of the NO.sub.x catalyst. For this reason, the exhaust purifying apparatus for an in-cylinder injection type internal combustion engine comprises an NO.sub.x catalyst (9A) for adhering NO.sub.x to itself in an excess oxygen concentration condition and desorbing NO.sub.x in an oxygen concentration reduction condition, and sulfur component desorption means (107) for desorbing a sulfur component from the NO.sub.x catalyst (9A). The sulfur component desorption means (107) injects additional fuel during an expansion stroke in addition to main injection and burns the additional fuel again so that exhaust gas temperature is raised to a predetermined temperature or beyond, whereby the sulfur component is desorbed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.