Airflow estimation method and apparatus for internal combustion engine

摘要

A method of estimating an air charge in at least one combustion cylinder of an internal combustion engine includes calculating cylinder mass air flow based upon a modified volumetric efficiency parameter; and calculating the intake throttle mass air flow based upon a throttle air flow discharge parameter and a fuel enrichment factor. Three models including a mean-value cylinder flow model, a manifold dynamics model, and a throttle flow model are provided to estimate the air charge in the at least one combustion cylinder and to control delivery of fuel to the fuel delivery system.