Patent ID: 6494185
Filing Date: 2002-12-17
Classification: F01L,F02D,Y02T

Abstract:
A fuel injection control apparatus for an engine having a variably operated engine valve in which at least a closure timing of an intake valve is variably controlled, the fuel injection control apparatus comprising:an intake valve closure state determining section that determines whether a closure timing of the intake valve is in a steady state or in a transient state; and a fuel injection quantity calculating section that calculates a volume of a cylinder from a control target value of the closure timing of the intake valve when the intake valve closure state determining section determines that the closure timing of the intake valve is in the steady state and from an actual closure timing of the intake valve when the intake valve closure state determining section determines that the closure timing of the intake valve is in the transient state, calculates a volume air quantity within the cylinder on the basis of the calculated volume of the cylinder and a fresh-air rate within the cylinder, calculates a mass air quantity sucked into the cylinder on the basis of a mass air quantity within an intake manifold of the engine calculated by income and outgo calculations of inflow and outflow quantities of a mass air within the intake manifold and a volume of the intake manifold, and calculates a fuel injection quantity on the basis of the mass air quantity sucked into the cylinder.