Delphi International Operations Luxembourg S.a.r.l.

Eric L P Michel

Julien Schmitt

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 (Q) required to reach a relatively rich target exhaust air fuel ratio (AFR) on the basis of a measured air flow; determining a heating-contributing fuel value (&#x3b7;Q) required to reach or maintain a target desulfation temperature in said NOx adsorber by way of an exothermal reaction; calculating a target air flow (Air) corresponding to the air flow required for a substantially stoichiometric combustion of a torque-contributing main fuel quantity (Q) together with said heating-contributing fuel value (&#x3b7;Q); and causing the engine to inject said post fuel amount (Q) and said main fuel quantity (Q) while controlling the air flow to meet said target air flow (Air).

Lean NOx trap desulfation process

A method of assessing the functioning of an EGR cooler of an EGR system in an internal combustion engine, wherein the EGR cooler can be selectively operated in a first and a second operating condition; and wherein the engine comprises at least one cylinder equipped with a pressure sensor. The assessment of the functioning of the EGR cooler is based on the variation of a combustion characteristic value depending on cylinder pressure (CA50), upon switching of the EGR cooler from a first to a second operating condition.

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Guelff, Belgium

Eric L P Michel