Exhaust purification device of internal combustion engine
US8132402B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2008 |
| Grant date | Mar 13, 2012 |
| Priority date | — |
| Expiry date | Oct 2, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In an internal combustion engine, an NOx selective reduction catalyst is arranged in the engine exhaust passage, and a urea aqueous solution feed valve is arranged in the engine exhaust passage upstream of the NOx selective reduction catalyst. Based on the detections results of an NOx purification rate detecting means for detecting the NOx purification rate by the NOx selective reduction catalyst, a urea aqueous solution feed amount detecting means for detecting the amount of feed of the urea aqueous solution, and a urea aqueous solution concentration detecting means for detecting the concentration of the urea aqueous solution, abnormalities in the NOx selective reduction catalyst, urea aqueous solution feed system, and urea aqueous solution are judged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.