Patent ID: 6234144
Filing Date: 2001-05-22
Classification: F01L,F02D,Y02T

Abstract:
An intake-air quantity control apparatus for an internal combustion engine with a variable valve timing system associated with at least an intake valve, comprising:a control unit which controls an intake-air quantity of air entering the internal combustion engine on the basis of at least one of an intake valve open timing and an intake valve closure timing of the intake valve: said control unit comprising(1) a desired internal pressure determination section which determines a desired internal pressure in an intake-air passage on the basis of a predetermined operating parameter,(2) an operation delay-time fluctuation rate detection section which detects an operation delay-time fluctuation rate for fluctuations in an operation delay time of at least the intake valve,(3) a desired intake-air quantity arithmetic-calculation section which arithmetically calculates a desired intake-air quantity on the basis of engine operating conditions,(4) a compensation section which compensates for the desired internal pressure on the basis of at least one of the operation delay-time fluctuation rate and the desired intake-air quantity to produce a compensated internal pressure,(5) a throttle-opening control section which controls a throttle opening on the basis of both the compensated internal pressure and the desired intake-air quantity, and(6) an intake-valve timing control section which controls the intake valve open timing and the intake valve closure timing on the basis of both the compensated internal pressure and the desired intake-air quantity.