Systems and methods for controlling the temperature of an aftertreatment system

A system for an engine, the system configured to communicate with a compressor, the system comprising:

• a conduit downstream of the compressor configured to deliver airflow to an intake manifold of the engine;
• a heat exchanger coupled to the conduit, the heat exchanger including a bypass conduit between an inlet of the heat exchanger and an outlet of the heat exchanger;
• a bypass valve coupled to the bypass conduit, the bypass valve configured to permit adjustment of airflow through the heat exchanger and the bypass conduit;
• an intake throttle valve coupled to the conduit downstream of the heat exchanger and coupled to the bypass conduit such that airflow from the bypass conduit is introduced to airflow exiting the outlet of the heat exchanger before entering the intake throttle valve, the intake throttle valve regulating airflow entering the engine;
• a selective catalytic reduction (SCR) system configured to receive exhaust gas produced by the engine through an SCR inlet;
• and
• a controller configured to:
• receive sensor data comprising an SCR inlet temperature,
• generate control signals to decrease airflow through the intake throttle valve to reduce a difference between the SCR inlet temperature and a target SCR inlet temperature responsive to the SCR inlet temperature being less than the target SCR inlet temperature, and
• generate control signals to increase airflow through the bypass valve to reduce a difference between the SCR inlet temperature and the target SCR inlet temperature responsive to the SCR inlet temperature being greater than the target SCR inlet temperature.

A controller for an internal combustion engine and exhaust system including a selective catalytic reduction (SCR) system, the controller comprising at least one processor coupled to at least one memory device storing instructions configured to, when executed by the at least one processor, cause the controller to:

• receive, from one or more sensors, sensor data associated with engine operating conditions including selective catalytic reduction (SCR) inlet temperature;
• determine a first deviation based on a difference between the SCR inlet temperature and a target SCR inlet temperature;
• adjust an intake throttle valve position based on the first deviation to control airflow through the throttle valve responsive to the first deviation exceeding an allowable deviation;
• determine a second deviation based on the adjusted intake throttle valve position and the difference between the SCR inlet temperature and the target SCR inlet temperature;
• and
• adjust a bypass valve position based on the second deviation to control airflow through the bypass valve responsive to a determination that the second deviation exceeds the allowable deviation.