International Engine Intellectual Property Company, LLC

Shouxian Ren

Xinqun Gui

Xinlei Wang

Guoqing Zhang

Justin M O'Connor

Pranab K Das

Patrick D Barasa

Steven P Gravante

Justin M O'CONNOR

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 ().

[object Object]

A control system (FIG.) for controlling regeneration of a DPF comprises a favorable-condition-based control section (), a regular control section (), and a regeneration termination control section (). Section () initiates regeneration when the actual soot loading of the DPF becomes sufficiently large to mandate initiation of regeneration. Section () initiates regeneration when the actual soot loading reaches an amount less than the amount at which section () mandates regeneration, provided that selected engine operating conditions disclose conditions favorable for regeneration. Section () terminates regeneration when soot loading is reduced to some minimum amount or when conditions for continuing regeneration become unfavorable. By burning trapped soot during favorable conditions, the mandatory regeneration is postponed. This can lower the average amount of trapped soot in the CDPF, thereby lowering the average back-pressure on the engine.

Soot burn-off control strategy for a catalyzed diesel particulate filter

An engine control system ( ) of a diesel engine ( ) that powers a motor vehicle processes data in execution of a strategy (FIG. ) to provide control of both timing and duration of forced regeneration of a diesel particulate filter ( ). The overall strategy is a hybrid of model-based and closed-loop control strategies. Redundant elements of the strategy (FIG. ) determine when forced regeneration is called for. Forced regeneration is initiated by retarding the timing of the start of main fuel injection ( ). Fueling is then adjusted ( ) both to enhance catalytic action and to make the process transparent to a driver of the vehicle.

Forced regeneration of a diesel particulate filter

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Westland, MI, United States of America

Shouxian Ren