Systems and methods for managing ammonia slip with a heater

A system comprising:

• an exhaust aftertreatment system including a heater;
• and
• a controller coupled to the exhaust aftertreatment system, the controller configured to:
• receive data regarding operation of the exhaust aftertreatment system;
• determine that a condition for ammonia slip is present based on the data regarding operation of the exhaust aftertreatment system;
• determine that a condition for ammonia storage is present based on an engine fueling rate exceeding a transient threshold;
• and
• command the heater to activate and warm a component of the exhaust aftertreatment system to reduce a stored amount of ammonia, the component being an Ammonia Slip Catalyst (ASC).

A non-transitory computer-readable storage medium comprising computer-readable instructions stored thereon that, when executed by a processor of a controller, causes the controller to perform operations comprising:

• receiving data regarding operation of an exhaust aftertreatment system, the data including at least one of (i) a sensed amount of engine-out NOx and a sensed amount of system-out NOx or (ii) a sensed amount of ammonia in an exhaust gas stream;
• determining that a condition for ammonia slip is present based on (i) the sensed amount of system-out NOx exceeding a sensed amount of engine-out NOx, or (ii) the sensed amount of ammonia in the exhaust gas stream exceeding a threshold;
• determining that a condition for ammonia storage is present based on an engine fueling rate exceeding a transient threshold;
• and
• commanding a heater to activate to warm a component of the exhaust aftertreatment system based on the condition for ammonia slip being present, the component being an Ammonia Slip Catalyst (ASC).