Systems and methods for ultra-low NOx cold start warmup control and fault diagnosis

A method for managing emissions from an engine, the method comprising:

• during a warmup period for the engine, determining a value regarding a mass flow rate of exhaust based on information received from at least one of the engine or an aftertreatment system;
• receiving a target value regarding the mass flow rate of exhaust;
• and
• controlling, based on the value regarding the mass flow rate of the exhaust gas, at least one of the engine, the aftertreatment system, or at least one component associated therewith to reach or attempt to converge to the target value.

A non-transitory computer-readable storage medium storing instructions therein that, when executed by one or more processors, cause the one or more processors to perform operations comprising:

• determining a value regarding a mass flow rate of exhaust;
• receiving a target value regarding the mass flow rate of exhaust;
• and
• controlling, based on the value regarding the mass flow rate of the exhaust gas, at least one of an engine, an aftertreatment system, or at least one component associated therewith to reach or attempt to converge to the target value regarding the mass flow rate of exhaust.