Exhaust purification device of internal combustion engine
US8250856B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 1, 2008 |
| Grant date | Aug 28, 2012 |
| Priority date | — |
| Expiry date | Jul 28, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In an internal combustion engine, an NOX selective reducing catalyst (15) is arranged in an engine exhaust passage. Aqueous urea is fed from an aqueous urea feed valve (17) into the NOX selective reducing catalyst (15) to selectively reduce the NOX contained in the exhaust gas with the ammonia generated from the aqueous urea. The moisture contained in the exhaust gas is recovered and stored in a water tank (21). It is provided with a high concentration aqueous urea tank (22) storing high concentration aqueous urea having a higher urea concentration than the urea concentration of the aqueous urea fed to the NOX selective reducing catalyst (15), and the high concentration aqueous urea is diluted with the recovered moisture thereby generating aqueous urea fed to the NOX selective reducing catalyst (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.