International Engine Intellectual Property Company, LLC

Patrick D Barasa

Justin M O'Connor

Xinlei Wang

Shouxian Ren

Timothy J Gundrum

Justin M O'CONNOR

A method for operating an internal combustion engine () and exhaust system therefor includes the step of initiating a regeneration event in a diesel particulate filter (DPF) (). A first oxygen concentration () of a gas upstream of the DPFand a second oxygen concentration () of the gas downstream of the DPFare sensed () to infer a rate of combustion of material in the DPF () based on the difference between the first () and the second () oxygen concentrations. The rate of combustion is compared to a threshold value () and the regeneration event in the DPFis terminated () if the rate of combustion is above the threshold.

DPF regeneration monitoring method

De-sulfurizing a NOadsorber catalyst () without significantly increasing the temperature of exhaust gases leaving the engine exhaust manifold () by using a diesel oxidation catalyst () between the exhaust manifold and the NOadsorber catalyst to elevate exhaust gas temperature entering the NOadsorber catalyst to suitable de-sulfurizing temperature through control of certain aspects of engine operation ().

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Batavia, IL, United States of America

Patrick D Barasa