Patent ID: 8146349

Claim:
An exhaust 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 and configured to collect matter from the flow of exhaust; a heating device located to selectively heat the matter collected within the particulate filter; and a controller in communication with the combustion engine and the heating device, the controller being configured to: determine an amount of matter collected within the particulate filter exceeding a threshold amount; activate the heating device in a first operating mode to regenerate the particulate filter based on the amount of collected matter and a determination that the combustion engine is operating outside of a temperature constraining condition; activate the heating device in a second operating mode based on the amount of collected matter and a determination that the combustion engine is operating in the temperature constraining condition; determine an amount of oxygen within the flow of exhaust during the second operating mode; and regulate an amount of energy added to the flow of exhaust by the heating device based on the determined amount of oxygen.