Device for determining the mass of NOx stored in a NOx trap, and a system for supervising the regeneration of a NOx trap including such a device
US7204079B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 2005 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Oct 12, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a device for determining the mass of NOx stored in a NOx trap in an exhaust line of a motor vehicle engine, the device comprising means for acquiring the richness of the exhaust gases, the NOx flowrate on the upstream side of the trap, and the temperature of the trap. This device further comprises means for comparing the richness to a predetermined value, first means for determining, when the exhaust gases are lean, the increase in the mass of NOx stored as a function of the mass of NOx already stored, the temperature of the trap, and the NOx flowrate on the upstream side of the trap, and second means for determining, when the exhaust gases are rich, the reduction of the mass of NOx stored as a function of the temperature of the trap and the richness of the exhaust gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.