Patent ID: 7565236
Filing Date: 2009-07-21
Classification: F02D

Abstract:
1. Method of estimating an air charge in at least one combustion cylinder of an internal combustion engine including a controller in signal communication with the engine and with a fuel delivery system, a combustion cylinder and piston reciprocating therein, an intake manifold directing flow of air into the at least one combustion cylinder, and an air throttle having a throttle orifice directing flow of air mass into the intake manifold, wherein the engine has cam-phasing and variable valve lift capability, the method comprising: calculating cylinder mass air flow based upon a volumetric efficiency parameter; calculating the intake throttle mass air flow based upon a throttle air flow discharge parameter and a fuel enrichment factor; using a first cylinder air mass flow adaptation loop to update the volumetric efficiency parameter; using a second throttle mass flow adaptation loop to update the throttle air flow discharge parameter; and using each of the first cylinder air mass flow adaptation loops and the second throttle mass flow adaptation loop to estimate the air charge within the at least one combustion cylinder.