Emission control apparatus of internal combustion engine
US6698188B2 · kind B2 · utility
19Cited by
15References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2001 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Dec 3, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/1468
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A NOx occluding member that occludes NOx when the air-fuel ratio is on the fuel-lean side is disposed in an engine exhaust passage. An NOx ammonia sensor is disposed in the engine exhaust passage downstream of the NOx occluding member. A surplus amount of a reducing agent that is not used to release NOx is determined from a change in the ammonia concentration detected by the NOx ammonia sensor when the air-fuel ratio is changed to the fuel-rich side so as to release the NOx from the NOx occluding member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.