A control system includes a cam position calculation module that
determines intake and exhaust cam positions during operation of an
engine. The engine includes a regeneration and fuel cut-off (FCO) mode. A
cam position adjustment module generates alternate intake and exhaust cam
positions during the regeneration and FCO mode. A cam positioning module
positions the intake and exhaust cams based on lower values of the intake
and exhaust cam positions and the alternate intake and exhaust cam
positions, respectively, during the regeneration and FCO mode.