A control device is applied to a multi-cylinder 4-cycle charge compression
ignition-type internal combustion engine. The control device operates to
open an exhaust valve in an exhaust stroke of each cylinder, operates to
close an intake valve before an intake bottom dead center, and then,
operates to open the exhaust valve again before the intake bottom dead
center. An exhaust flow rate regulating valve is disposed in a collecting
portion of an exhaust path and its opening is controlled. Hereby, a
period in which the exhaust valve is open in an intake stroke of one
cylinder and a period in which the exhaust valve is open in an exhaust
stroke of another cylinder partially overlap each other. Combustion gas
pushed out of a combustion chamber of the other cylinder in the
overlapping period is pushed into a combustion chamber of the one
cylinder via the exhaust path.