Patent ID: 6986330

Claim:
An internal combustion engine comprising: an intake valve; and a variable valve actuation device that is capable of variably controlling lift of the intake valve so as to change an amount of opening of the intake valve, wherein the variable valve actuation device is adapted to: calculate a first estimated value of an amount of intake air from a first parameter regarding an operation state of the engine at a time of opening the intake valve; calculate a second estimated value of the amount of intake air from a second parameter regarding the operation state of the engine at a time of closing the intake valve; and calculate an actual amount of intake air based on equation (1), where: equation (1) is: Ga=Gao+(Gac−Gao)×K, Ga is the actual amount of intake air Gao is the first estimated value Gac is the second estimated value, and K is a weighting factor.