Exhaust purification system and method of desulfurizing lean NOx trap of exhaust purification system provided with lean NOx trap and selective catalytic reduction catalyst
US10287944B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 1, 2015 |
| Grant date | May 14, 2019 |
| Priority date | — |
| Expiry date | May 3, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of desulfurizing a lean NOx trap (LNT) of an exhaust purification system provided with the LNT and a selective catalytic reduction (SCR) catalyst includes determining whether a desulfurization feasibility condition of the LNT is satisfied, determining whether a desulfurization demand condition of the LNT is satisfied, and performing desulfurization of the LNT if both of the desulfurization feasibility condition of the LNT and the desulfurization demand condition of the LNT are satisfied, wherein the desulfurization of the LNT is performed by repeating a desulfurization lean mode and a desulfurization rich mode according to whether a mode switching condition due to a desulfurization temperature is satisfied and whether a mode switching condition due to generation of H2S is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.