System and method for in-cylinder dosing (ICD) for an engine

A method of operating an engine, the engine including, a plurality of cylinders each having a piston reciprocally movable therein to perform a combustion cycle, an aftertreatment device disposed in an exhaust system, and a plurality of injectors disposed one each in the plurality of cylinders to introduce a total regeneration quantity of dosing fuel for regenerating the aftertreatment device, the method comprising:

• converting an amount of heat needed for regenerating the aftertreatment device into a cam-stroke fueling strategy;
• determining a number of active cylinders to introduce the total regeneration quantity of dosing fuel based on the cam-stroke fueling strategy;
• calculating a total dosing fuel apportionment of the total regeneration quantity of dosing fuel for each of the active cylinders based on the cam-stroke fueling strategy;
• determining a number of dosing shots per injector for each of the active cylinders based on the total dosing fuel apportionment;
• apportioning an amount of dosing fuel for each dosing shot according to the cam-stroke fueling strategy;
• actuating the injectors of the active cylinders to inject the total regeneration quantity of dosing fuel in the apportioned amounts for each dosing shot;
• and
• determining a cylinder number rank of the active cylinders to introduce extra dosing shots.

A non-transitory computer readable storage device comprising a program that when executed by circuitry in an engine configures the circuitry to perform in-cylinder dosing (ICD) control for the engine, wherein

• the circuitry is configured by the program to control in-cylinder dosing (ICU) for regenerating an aftertreatment device associated with the engine, the program causing the circuitry to further perform:
• converting an amount of heat needed for regenerating the aftertreatment device into a cam-stroke fueling strategy;
• determining a number of active cylinders of the engine to introduce dosing fuel based on the cam-stroke fueling strategy;
• calculating a total dosing fuel apportionment of the dosing fuel for each of the active cylinders based on the cam-stroke fueling strategy;
• determining a number of dosing shots for each of the active cylinders based on the total dosing fuel apportionment;
• apportioning an amount of dosing fuel for each dosing shot according to the cam-stroke fueling strategy;
• and
• actuating injectors of the engine associated with each of the active cylinders to inject the dosing fuel in the apportioned amounts for each dosing shot,
• wherein said calculating the total dosing fuel apportionment of the dosing fuel for each of the active cylinders includes the program causing the circuitry to further perform:
• calculating the dosing shot apportionments based on a single shot boost energy.