Patent ID: 6920863

Claim:
An intake-air measuring apparatus for an internal combustion engine, comprising: a throttle valve pass air mass calculation means for calculating an airflow passing through a throttle valve, from an opening of said throttle valve, pressures in up/down streams of said throttle valve and temperature in downstream of said throttle valve; an intake valve pass air mass calculation means for calculating an air mass passing through an intake valve, from an arbitrary combination of an open/close timing of said intake valve, an opening of an EGR valve, and a rotation speed of the internal combustion engine, where the combination includes at least the rotation speed of the internal combustion engine therein; and a selection means for selecting either one of the air mass calculated out by said throttle valve pass air mass calculation means or the air mass calculated by said intake valve pass air mass calculation means, on the basis of operation condition of the internal combustion engine, thereby outputting the selected air mass as the inducted air mass into the internal combustion engine.