Patent ID: 8375705

Claim:
An exhaust control system for use with a combustion engine, comprising: an exhaust passage configured to receive a flow of exhaust from the combustion engine; a particulate filter located within the exhaust passage; an oxidation catalyst located to promote regeneration of the particulate filter, the oxidation catalyst having an activation temperature range; a heating device located to selectively heat the oxidation catalyst to within the activation temperature range; and a controller in communication with the combustion engine and the heating device, the controller being configured to: detect a loading of the particulate filter exceeding a first loaded threshold amount; detect a low temperature condition of the combustion engine; and activate the heating device to heat the oxidation catalyst after the loading of the particulate filter exceeds the first loaded threshold amount, the control of the heating device stopping when the loading of the particulate filter is reduced below a second loaded threshold amount; wherein the second loaded threshold amount is greater than the first loaded threshold amount.