Internal combustion engine with exhaust gas aftertreatment and control of the nitrogen oxide emissions

A method having exhaust gas emission control for an internal combustion engine, comprising:

• setting, a target emissions value, for an emissions average value of an exhaust emissions portion of an exhaust gas produced by one or more piston-cylinder assemblies of the internal combustion engine, to achieve in relation to a period of time at a discharge from an exhaust gas aftertreatment apparatus having at least one catalytic converter;
• and
• calculating an emissions reference value at a plurality of times during the period of time, wherein the emissions reference value is at least based on an already emitted amount of the exhaust emissions portion and the target emissions value during the period of time, wherein the emissions reference value is an emissions setpoint value selected to achieve the target emissions value by an end of the period of time, wherein the emissions reference value varies during the period of time, and the period of time occurs during a transient operating mode of the internal combustion engine;
• wherein setting and calculating are performed via a controller.

A system having exhaust gas emissions control, comprising:

• an internal combustion engine configured to produce an exhaust gas having an exhaust emissions portion;
• an exhaust gas aftertreatment apparatus configured to treat the exhaust gas to lower an amount of the exhaust emissions portion;
• and
• a controller configured to:
• set a target emissions value, for an emissions average value of the exhaust emissions portion, to achieve in relation to a period of time at a discharge from the exhaust gas aftertreatment apparatus;
• and
• calculate an emissions reference value at a plurality of times during the period of time, wherein the emissions reference value is at least based on an already emitted amount of the exhaust emissions portion and the target emissions value during the period of time, wherein the emissions reference value is an emissions setpoint value selected to achieve the target emissions value by an end of the period of time, wherein the emissions reference value varies during the period of time, and the period of time occurs during a transient operating mode of the internal combustion engine.

A system, comprising:

• a controller configured to:
• set a target value, for an emissions average value of an exhaust emissions portion of an exhaust gas produced by one or more piston-cylinder assemblies of an internal combustion engine, to achieve in relation to a period of time at a discharge from an exhaust gas aftertreatment apparatus having at least one catalytic converter;
• and
• calculate an emissions reference value at least based on an already emitted amount of the exhaust emissions portion and the target value, wherein the emissions reference value is selected to achieve the target value by an end of the period of time;
• wherein the controller is configured to, during a starting time of the internal combustion engine, reduce the exhaust emissions portion by at least setting a power ramp for the internal combustion engine in a first time portion, after a power output reaches a minimum power output, until the power output reaches a limit value with a first lesser gradient and in a second time portion until the power output reaches a nominal power output of the internal combustion engine with a second greater gradient, wherein the second greater gradient is calculated in dependence on a remaining time to reach the starting time.