NOX catalyst exhaust feedstream control system
US6422003B1 · kind B1 · utility
11Cited by
16References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2000 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Nov 15, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved method of “adaptive” control that optimizes NOx conversion efficiency while minimizing fuel consumption. This method limits the NOx level in the feedstream to a NOx catalyst to a level that the catalyst can process by adjusting certain engine parameters, namely exhaust gas recirculation percentage, air-to-fuel ratio, and spark ignition timing in a spark-ignition engine or fuel injection timing in a compression-ignition engine. This method results in improved fuel efficiency over previous methods of controlling NOx emissions by allowing longer periods of lean operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.