Patent ID: 8095298

Claim:
A control system of a variable valve actuation system employing a variable valve actuation device for variably adjusting a working angle of an intake valve of an internal combustion engine and an electric motor for changing the working angle by actuating the variable valve actuation device depending on engine operating conditions, the control system comprising: a desired value setting section configured to set a desired value of the working angle of the intake valve to a working angle value having a predetermined valve open period suited to an engine-stopping period after an engine-stop signal for the engine has been outputted; a working-angle decision section configured to determine whether the desired working angle value has been reached; a stop processing section configured to execute engine-stop processing to stop the engine when the desired working angle value has been reached; an engine-speed decision section configured to determine whether a predetermined cranking speed of the engine has been reached after an engine-restart signal has been outputted after the engine has been stopped via the engine-stop processing; and a working-angle enlargement section configured to enlarge the working angle of the intake valve to a working angle value greater than the desired working angle value suited to the engine-stopping period when the predetermined cranking speed has been reached.