SYSTEMS AND METHODS FOR COLD OPERATION NOx BURDEN REDUCTION

A system comprising:

• an aftertreatment system;
• and
• a controller coupled to the aftertreatment system, the controller configured to:
• determine, based on a current temperature of the aftertreatment system, that the aftertreatment system is in a cold-operation mode;
• initiate a low engine-out NOx (LEON) mode by controlling a component of a vehicle containing the aftertreatment system to decrease an instantaneous engine-out NOx (EONOx) amount and to increase exhaust energy relative to a normal operation mode for an engine;
• receive information indicative of an operating status of the vehicle during the LEON mode;
• based on the information indicative of the operating status of the vehicle during LEON mode, disengage the LEON mode;
• subsequent to disengaging the LEON mode, initiate a thermal management (TM) mode for the aftertreatment system based on the information indicative of the operating status of the vehicle during the LEON mode, wherein the TM mode is initiated by controlling a component of the vehicle to increase fueling to the engine for a power level of the engine by reducing engine efficiency and directing excess fuel energy to the aftertreatment system;
• receive information indicative of an operating status of the vehicle during the TM mode;
• and
• based on the information indicative of the operating status of the vehicle during TM mode, disengage the TM mode.

A controller for an aftertreatment system, the controller comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the one or more processors to:
• determine, based on a current temperature of the aftertreatment system, that the aftertreatment system is in a cold-operation mode;
• initiate a low engine-out NOx (LEON) mode by controlling a component of a vehicle containing the aftertreatment system to decrease an engine-out NOx (EONOx) amount and to increase exhaust energy relative to a normal operation mode for an engine;
• receive information indicative of an operating status of the vehicle during the LEON mode;
• based on the information indicative of the operating status of the vehicle during LEON mode, disengage the LEON mode;
• subsequent to disengaging the LEON mode, initiate a thermal management (TM) mode for the aftertreatment system based on the information indicative of the operating status of the vehicle during the LEON mode;
• receive information indicative of an operating status of the vehicle during the TM mode;
• and
• based on the information indicative of the operating status of the vehicle during TM mode, disengage the TM mode.