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US 9,429,088 B2Granted
Lean NOx trap desulfation process
AssigneeDelphi International Operations Luxembourg S A.R.L.
InventorsJulien Schmitt, Eric L. P. Michel
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AssigneeDelphi International Operations Luxembourg S A.R.L.
InventorsJulien Schmitt, Eric L. P. Michel
Estimating the term…
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).
A process for desulfation of a NOx adsorber in an internal combustion engine exhaust system, said process comprising an active phase including:
Dependencies are inferred from the claim text.