Cummins Inc.

Joshua A Lantz

Ian W McGiffen

Boopathi Singalandapuram Mahadevan

Ankit Raghunath Lad

Todd C Bouws

Douglas A Roxbury

Paul Daniel Borisuk

John L Hoehne

Vaibhav J Lawand

Nicholas R Lewis

Arulkumaran Muthukumarasamy

Jeffrey W Lewis

Snita Navnith Menon

Snita Navnit Menon

Systems and methods for removing soot in an aftertreatment system are disclosed. A method includes: receiving data regarding an exhaust gas flow rate of exhaust gas; receiving data regarding a selective catalytic reduction (SCR) inlet temperature; determining an adsorption amount of soot in the exhaust aftertreatment system based on the exhaust gas flow rate of the exhaust gas and the SCR inlet temperature; comparing the adsorption amount of soot to a predefined adsorption amount limit; in response to the adsorption amount of soot exceeding the predefined adsorption amount limit; initiating an exhaust cleaning event to remove at least some accumulated soot in the exhaust aftertreatment system; receiving exhaust gas data during the exhaust cleaning event; determining a desorption amount of soot based on the exhaust gas data; comparing the desorption amount of soot to a predefined desorption limit; and ceasing the exhaust cleaning event based on the comparison.

Methods and systems for removing deposits in an aftertreatment system to minimize visible smoke emissions

A method includes determining that at least one diesel emissions fluid (DEF) doser of an exhaust aftertreatment system is likely frozen based on at least one of an ambient air temperature or a DEF source temperature; operating an engine in a cylinder cutout mode in response to the determination that the at least one DEF doser is likely frozen; and, discontinuing the cylinder cutout mode in response to determining that the at least one DEF doser is in a predefined condition.

Diesel exhaust fluid doser protection during cold ambient temperature conditions using cylinder cutout methods

Systems and methods for removing accumulated soot in an aftertreatment system are disclosed herein. A method includes: determining, by a controller, an adsorption amount of soot in an exhaust aftertreatment system; comparing, by the controller, the adsorption amount of soot to a predefined adsorption amount limit; in response to the adsorption amount exceeding the predefined adsorption amount limit, initiating, by the controller, an exhaust cleaning event to remove at least some accumulated soot in the exhaust aftertreatment system; receiving, by the controller, exhaust gas data during the exhaust cleaning event; determining, by the controller, a desorption amount of soot based on the exhaust gas data; comparing, by the controller, the desorption amount of soot to a predefined desorption limit; and ceasing, by the controller, the exhaust cleaning event based on the comparison.

A controller for removing deposits in a vehicle is disclosed. The controller includes at least one processor and a memory storing instructions therein that, when executed by the at least one processor, cause the at least one processor to: determine an amount of deposits accumulated in the vehicle based on an amount of time; determine a combustion target for the vehicle in response to determining that the amount of deposits exceeds a deposit threshold; and modulate a fluid flow of the vehicle based on the determined combustion target.

Methods and systems for removing deposits in an aftertreatment system

A system includes an exhaust aftertreatment system in exhaust gas receiving communication with an engine including a plurality of cylinders where the engine is structured to operate according to low load conditions and where a controller is structured to determine that at least one diesel emissions fluid (DEF) doser is frozen based on at least one of an ambient air temperature and a DEF source temperature. The controller is structured to operate the engine according to a skip-fire mode in response to a DEF flag indicating that the at least one DEF doser is frozen. The skip-fire mode comprises firing a portion of the plurality of cylinders that is less than a total amount of cylinders of the plurality of cylinders. The controller is structured to discontinue the skip-fire mode in response to determining that the at least one DEF doser is likely thawed.

Systems and methods for removing accumulated soot in an aftertreatment system for an engine are disclosed herein. A method includes receiving an indication that an engine of a vehicle has been operating in a low load condition for more than a predefined amount of time; in response, determining an adsorption rate of soot in an exhaust aftertreatment system of the vehicle; determining an adsorption amount of soot based on the adsorption rate for a predefined amount of time; comparing the adsorption amount to a predefine adsorption amount limit; and in response to the adsorption amount exceeding the predefined adsorption amount limit, initiating an exhaust cleaning event to remove at least some of the accumulated soot in the exhaust aftertreatment system.

Systems and methods for removing deposit in an aftertreatment system for an engine are disclosed herein. The method comprises determining an amount of deposits accumulated in the aftertreatment system, determining combustion targets for the engine in response to determining the amount of deposits exceeds a deposit threshold, and modulating an air mass flow for the engine based on the determined combustion targets. The air mass flow can be modulated by changing the position of the wastegate or the geometry of the variable geometry turbine (VGT).

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North Vernon, IN, United States of America

Joshua A Lantz