Method and system for aftertreatment control

A method for controlling an internal combustion engine system including a particulate filter during operation of the internal combustion engine system, the method comprising:

• receiving, with an electronic control module, a request for a power output from an internal combustion engine;
• receiving, with the electronic control module, information via at least one sensor, including information indicating a quantity of soot present in the particulate filter;
• calculating, with the electronic control module, a plurality of sets of engine performance values based on respective sets of candidate control points including candidate control points for controlling a fuel injector to adjust an injected fuel mass during at least one of a main injection, a pilot injection, or a post-main injection, each of the plurality of sets of the engine performance values including a soot change rate at which the quantity of soot changes over time;
• determining, with the electronic control module, that at least one set of engine performance values satisfies a soot change rate limit to require an increase in the quantity of soot in the particulate filter, wherein the soot change rate limit corresponds to a rate at which a quantity of soot in the particulate filter is expected to change over time;
• and
• updating, with an optimizer module of the electronic control module, a control map stored within a memory associated with the electronic control module with the candidate control points associated with the at least one set of engine performance values.

A control system for an internal combustion engine system, comprising:

• a particulate filter configured to receive soot-containing exhaust;
• a sensor configured to produce a signal indicating an amount of soot in the particulate filter;
• and
• a controller including a storage device storing data that allow the controller to:
• receive the signal from the sensor;
• determine that the particulate filter is in a low soot state based on the signal;
• set a soot change limit based on the particulate filter being in the low soot state to achieve an increase in the amount of soot in the particulate filter, wherein the soot change limit corresponds to a rate at which a quantity of soot in the particulate filter is expected to change over time;
• and
• operate at least one component of the internal combustion engine system, including a timing of fuel injection with a fuel injector during at least one of a main injection, a pilot injection, or post-main injection, based on the soot change limit by selecting a set of engine parameters that satisfies the soot change limit.