Patent ID: 8220263

Claim:
A control apparatus for an internal combustion engine, the apparatus comprising: a variable valve mechanism which makes variable a valve overlap period, in which an intake valve opening period overlaps with an exhaust valve opening period; overlap period control means for controlling the variable valve mechanism to control the valve overlap period; a turbocharger which includes a turbine driven by exhaust energy of the internal combustion engine, and a variable nozzle for adjusting a flow rate of exhaust gas supplied to the turbine; nozzle opening degree control means for controlling an opening degree of the variable nozzle; and acceleration request detecting means for detecting existence of nonexistence of an acceleration request, wherein the nozzle opening degree control means includes nozzle closing control execution means for controlling the opening degree of the variable nozzle so as to be a first predetermined opening degree, which is on a closing side with respect to the opening degree of the variable nozzle at a detection time point at which the acceleration request is detected, for a duration from the detection time point to a judgment time point at which the exhaust pressure pulsation is judged to have been enhanced during acceleration, wherein the overlap period control means includes overlap period restricting means for controlling the valve overlap period in such a way as to be shorten than the valve overlap period at the detection time point, for the duration from the detection time point to the judgment time point, wherein the nozzle opening degree control means further includes nozzle opening control execution means for controlling the opening degree of the variable nozzle to be a second predetermined opening degree which is on an opening side with respect to the first predetermined opening degree, after the determination time point is passed, and wherein the overlap period control means further includes overlap period setting means for setting the valve overlap period in such a way as to overlap with a timing at which trough of the exhaust pressure pulsation comes after the judgment time point is passed.