Patent ID: 6325047
Filing Date: 2001-12-04
Classification: F02D,Y02T

Abstract:
A control apparatus f or an internal combustion engine for variably controlling an opening/closing timing of an intake valve and an exhaust valve of the internal combustion engine in response to an engine operating condition, the apparatus comprising:a memory for storing an ignition timing control parameter as a plurality of data preset on the basis of an intake pressure and an rpm of the internal combustion engine;a valve opening/closing element provided on a camshaft which is operably connected with a crank shaft of the internal combustion engine for drivingly opening/closing the intake valve and the exhaust valve in synchronism with a rotation of the crank shaft;a rotational phase controller for shifting a rotational phase of the camshaft relative to the crank shaft;a shift amount detector for detecting a shift amount of the rotational phase of the camshaft relative to the crank shaft caused by the rotation shift controller;a compensator for calculating control data on the basis of the intake pressure, the rpm of the engine and the plurality of data of the ignition timing control parameter stored in the memory and for compensating the calculated data on the basis of the detection value of the shift amount detector; andan ignition timing controller for controlling an ignition timing for each cylinder of the internal combustion engine in accordance with data in which the ignition timing control parameter has been compensated for;wherein the ignition timing control parameter has a change-rate change maximum point at which a change in a change rate of the ignition control parameter relative to the shift amount of the camshaft is at maximum, and the data of the ignition timing control parameter is determined in advance for each shift amount substantially corresponding to the change-rate change maximum point.