Patent ID: 6588261
Filing Date: 2003-07-08
Classification: F02D,G01M,Y02T

Abstract:
A method of determining air entering cylinders of an internal combustion engine having a supercharger, comprising the steps of:using a suction equation to represent a first relationship between a relative filling per stroke and an intake manifold pressure; using a first balancing equation for a filling in an intake manifold to represent a second relationship between the intake manifold pressure, a relative air mass per stroke through a throttle valve, and the relative filling per stroke; using a flow rate equation at the throttle valve to represent a third relationship between the relative air mass per stroke through the throttle valve, a mass flow through the throttle valve, and an rpm of the internal combustion engine; using a second balancing equation in a first volume between the throttle valve and the supercharger to represent a fourth relationship between an air mass entering the internal combustion engine, the relative air mass through the throttle valve, and one of a boost pressure and a pressure upstream from the throttle valve; and determining the air using the suction equation, the first balancing equation, the flow rate equation, and the second balancing equation, the air being determined as a function of at least the rpm, an air throughput in the intake manifold, throttle valve position values and temperature, the suction equation, the first and second balancing equations, and the flow rate equation using values based on standard conditions for the equations.