Patent ID: 6687599
Filing Date: 2004-02-03
Classification: F02D

Abstract:
A method for estimating air-mass drawn into cylinders comprising:detecting a current throttle opening TPS; detecting a current engine speed RPM; detecting an air mass Mmani currently drawn into an intake-manifold; calculating a delay period &Dgr;t of from injecting fuel to a predetermined target moment; calculating an expectation value E_TPS&Dgr;t of throttle opening after the delay period &Dgr;t; calculating an expectation value E_Mmani,&Dgr;t of air-mass drawn into the intake-manifold after the delay period &Dgr;t on the basis of the expectation value E_TPS&Dgr;t of throttle opening; calculating an expectation value E_Pmani,&Dgr;t of intake-manifold pressure after the delay period &Dgr;t on the basis of the expectation value E_Mmani,&Dgr;t of air-mass drawn into the intake-manifold; and calculating an expectation value E_Mcyl,&Dgr;t of air-mass drawn into cylinders after the delay period &Dgr;t on the basis of the expectation value E_Pmani,&Dgr;t of intake-manifold pressure.