A method, used with an internal combustion engine, of providing fresh air for regeneration of an exhaust aftertreatment device. An air intake diversion line is installed from a point between the throttle and the compressor to a point upstream of the exhaust aftertreatment device. A valve on this diversion line is normally closed. If the engine temperature is above a certain threshold and if the engine is in a "high load deceleration" state, the valve is opened, which diverts fresh air to the exhaust aftertreatment device. The valve is then closed after the pressure in the intake line is relieved.
Daneil C. Bitsis, Jr.