Patent ID: 9046026
Filing Date: 2015-06-02
Classification: F01N,Y02T

Abstract:
1. A method of treating the exhaust from a diesel engine having an exhaust line from the engine, and having an exhaust aftertreatment system on the exhaust line comprising in the following order: at least one diesel oxidation catalyst, a set of one or more upstream particulate oxidation catalysts, and a last particulate oxidation catalyst, the upstream particulate oxidation catalysts and the last particulate oxidation catalyst being operable to be actively regenerated with heat applied to the exhaust aftertreatment system; the method comprising: measuring pressure differences across the upstream particulate oxidation catalysts, using a first differential pressure sensor, repeatedly during operation of the engine; measuring pressure differences across the last particulate oxidation catalyst, using a second differential pressure sensor, repeatedly during operation of the engine; actively regenerating the upstream particulate oxidation catalysts when the pressure difference across the upstream particulate oxidations catalysts is above a predetermined pressure difference threshold; and actively regenerating the last particulate oxidation catalyst when the pressure difference across the last particulate oxidation catalyst deviates from a constant or near constant value that is near the initial pressure difference value of the last particulate oxidation catalyst in a clean condition and that is lower than the predetermined pressure difference threshold.