Exhaust purification system of internal combustion engine
US9453445B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 2013 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | Feb 25, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An internal combustion is configured such that a hydrocarbon supply valve (15) and an exhaust gas purification catalyst (13) are arranged in an engine exhaust gas passage and such that NOx contained within exhaust gas is purified by spraying hydrocarbon from the hydrocarbon supply valve (15) at predetermined intervals. When SOx is to be released from the exhaust gas purification catalyst (13), the air-fuel ratio of exhaust gas which flows into the exhaust gas purification catalyst (13) is enriched by generating, within a cylinder, combustion gas having a rich air-fuel ratio, and after that the air-fuel ratio of exhaust gas which flows into the exhaust gas purification catalyst (13) is enriched by supplying hydrocarbon from the hydrocarbon supply valve (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.