Patent ID: 8511154
Filing Date: 2013-08-20
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. Method for estimating a cylinder air charge for an internal combustion engine, comprising: determining a first volumetric efficiency corresponding to engine operation with an open exhaust gas recirculation valve; determining a second volumetric efficiency corresponding to engine operation with a closed exhaust gas recirculation valve; and determining a cylinder air charge using a selected one of the first and second volumetric efficiencies; wherein determining the first volumetric efficiency comprises: determining a proportion of an intake air charge that is recirculated exhaust gas; and determining the first volumetric efficiency as a function of an engine speed and the proportion of the intake air charge that is recirculated exhaust gas; wherein determining the proportion of the intake air charge that is recirculated exhaust gas comprises: