System and method to minimize the amount of NOx released from a NOx trap
US6823843B1 · kind B1 · utility
12Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2004 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Jan 13, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method is described for controlling lean and rich operation of an internal combustion engine coupled to a lean NOx trap. In one example, the termination of the lean air-fuel mixture is based on an oxygen storage capacity and temperature of the NOx trap. In another example, the level and duration of rich air-fuel ratio purging operation is also controlled based on the oxygen storage capacity of the NOx trap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.