Patent ID: 8631642

Claim:
A power system comprising: an engine configured to produce exhaust; an aftertreatment system configured to treat the exhaust and including: an oxidation catalyst configured to convert NO from the engine into NO 2 ; a particulate filter configured to trap soot from the engine; and a sensor configured to provide an indication of the amount of soot in the particulate filter; an exhaust system configured to route the exhaust from the engine to the aftertreatment system and including a backpressure valve; and a controller configured to: change operating parameters of the power system to raise a NOx/soot ratio in the exhaust to greater than 35/1 in response to the amount of soot in the particulate filter being above a threshold; and at least partially close the backpressure valve in response to the amount of soot in the particulate filter being above the threshold.