Abstract: An exhaust system for an engine is provided that may have an exhaust passage configured to direct exhaust from the engine to the atmosphere. The exhaust system may also have an aftertreatment component disposed within the exhaust passage, a throttle configured to generate a throttle position signal indicative of a throttle position of the engine, and a temperature sensor configured to generate a temperature signal indicative of the exhaust temperature. The exhaust system may also have a controller in communication with the engine, the throttle, the sensor, and the aftertreatment component, configured to monitor the temperature signal and track a total duration for which the temperature signal is less than a threshold temperature. The controller may also be configured to initiate a load increase on the engine to raise a temperature of exhaust exiting the engine when the total duration is greater than a threshold duration.