Patent ID: 6328007
Filing Date: 2001-12-11
Classification: F01L,F02D,F02M,Y02T

Abstract:
An apparatus for calculating an internal cylinder intake-air quantity for a variable valve timing controlled engine, comprising:an airflow meter installed in an upstream portion of an intake manifold with respect to an intake valve whose at least closure timing is variably controlled; anda controller programmed to calculate an air quantity flowing into the intake manifold from an output of the airflow meter; to calculate a cylinder volume of a corresponding cylinder of the engine; to calculate an income and outgo of an air quantity flowing into the intake manifold and a cylinder intake-air quantity flowing from the intake manifold into the corresponding cylinder to derive an air quantity in the intake manifold; to calculate the internal cylinder intake-air quantity on the basis of the air quantity of the intake manifold and the cylinder volume; and to correct the calculated cylinder volume on the basis of at least valve closure timing of the intake valve.