Patent ID: 7801667

Claim:
A control apparatus for an internal-combustion engine having a variable valve actuation mechanism for controlling an intake air amount by adjusting a lift amount and a phase of an intake valve of the engine, the apparatus comprising: a storage for storing an intake air amount map indicating a correlation among a rotational speed, a gauge pressure of an intake manifold, a lift amount of the intake valve, a phase of the intake valve and an intake air amount of the engine under a reference condition of a predetermined reference atmospheric pressure and a predetermined reference intake air temperature; and a control unit configured to: determine an intake air amount for the reference condition as a reference intake air amount by referring to the intake air amount map based on a current rotational speed, a current gauge pressure of the intake manifold, a current lift amount of the intake valve and a current phase of the intake valve; and correct the reference intake air amount with a ratio between an air density under a current condition of a current atmospheric pressure, a current intake air temperature and a current gauge pressure and an air density under the reference condition to calculate an intake air amount for the current condition.