Integrated optimization and control of an engine and aftertreatment system

An engine monitoring system comprising:

• an engine having engine actuators and including at least a turbocharger having a turbine and a wastegate (WG) configured to controllably allow exhaust gasses to bypass the turbine, wherein at least one of the engine actuators controls a position of the WG, and wherein the engine is configured to discharge the exhaust gasses;
• an aftertreatment system configured to receive the exhaust gasses from the engine, reduce pollutants in the exhaust gasses below an emission limit, and emit a discharged gas;
• sensors configured to sense properties in the exhaust gasses;
• and
• a controller operatively coupled to the engine and the sensors and configured to:
• receive measurements of the sensed properties in the exhaust gasses from the sensors;
• control the WG to raise a temperature of the exhaust gasses when a state of the aftertreatment system does not enable reduction of the pollutants to a level below the emission limit due to low temperature;
• and
• control the engine actuators to maximize a fuel economy of the engine when the state of the aftertreatment system does enable reduction of the pollutants to a level below the emission limit.

A method for monitoring an engine system comprising an engine having engine actuators including at least one of a variable geometry turbocharger (VGT) or a turbocharger with a wastegate (WG), the engine system also including an aftertreatment system configured to receive exhaust gas from the engine, reduce a level of pollutants in the exhaust gas below an emission limit, and emit a discharge gas, the method comprising:

• receiving measurements of sensed properties in the exhaust gas;
• controlling at least one of the VGT or WG to raise a temperature when a state of the aftertreatment systems does not enable reduction of the level of the pollutants to a level below the emission limit due to low temperature;
• and
• controlling the engine actuators to maximize a fuel economy of the engine when the state of the aftertreatment system does enable reduction of the level of pollutants to a level below the emission limit.