Patent ID: 8036806

Claim:
A variable valve actuation system of an internal combustion engine employing a supercharging device for supercharging intake air into an engine cylinder, comprising: a variable valve lift mechanism provided for variably controlling at least an intake-valve lift of engine valves; a variable phase control mechanism provided for variably phase-shifting a central phase angle of a valve lift characteristic curve of at least one of intake and exhaust valves; and a control system configured to electronically connected to the variable valve lift mechanism, the variable phase control mechanism, and the supercharging device, said control system programmed to perform the following, (a) increasing the intake-valve lift by the variable valve lift mechanism when an accelerator opening increases from a small accelerator-opening condition; and (b) increasing a valve overlap of the intake and exhaust valves by the variable phase control mechanism, while increasing a boost pressure by the supercharging device, after the intake-valve lift has been increased.