Lean NOx trap desulfation process
US9429088B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2013 |
| Grant date | Aug 30, 2016 |
| Priority date | — |
| Expiry date | May 3, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A process for desulfation of a NOx adsorber in a diesel internal combustion engine exhaust system is disclosed, which comprises: determining an amount of post fuel (Q2) required to reach a relatively rich target exhaust air fuel ratio (AFRrich) on the basis of a measured air flow; determining a heating-contributing fuel value (ηQ2) required to reach or maintain a target desulfation temperature in said NOx adsorber by way of an exothermal reaction; calculating a target air flow (Airtgt) corresponding to the air flow required for a substantially stoichiometric combustion of a torque-contributing main fuel quantity (Q1) together with said heating-contributing fuel value (ηQ2); and causing the engine to inject said post fuel amount (Q2) and said main fuel quantity (Q1) while controlling the air flow to meet said target air flow (Airtgt).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.