초록 ▼

A method or an apparatus controls a continuously variable valve timing mechanism of an internal combustion engine to continuously and variably control the timing of an intake valve according to atmospheric pressure. The method or apparatus reads an engine revolution speed NE, an engine load GN, and

A method or an apparatus controls a continuously variable valve timing mechanism of an internal combustion engine to continuously and variably control the timing of an intake valve according to atmospheric pressure. The method or apparatus reads an engine revolution speed NE, an engine load GN, and an atmospheric pressure PA, refers to a map according to the atmospheric pressure PA, to find an atmospheric pressure correction coefficient Kpa, which is 1.0 at low altitudes with PA=760 mmHg and decreases as the altitude increases, i.e., as the atmospheric pressure PA decreases, calculates a corrected engine load GNpa as GNpa.rarw.GN/Kpa, and refers to a map according to the corrected engine load GNpa and engine revolution speed NE, to find a target displacement to be imposed on the open/close timing of the intake valve.

대표청구항 ▼

[ What is claimed is:] [2.] An apparatus for controlling valve timing of an internal combustion engine, comprising:a valve timing mechanism for continuously and variably controlling an opening and closing timing of at least one of intake and exhaust valves of the engine;a control map for determining

[ What is claimed is:] [2.] An apparatus for controlling valve timing of an internal combustion engine, comprising:a valve timing mechanism for continuously and variably controlling an opening and closing timing of at least one of intake and exhaust valves of the engine;a control map for determining a displacement from a reference timing as a target valve timing according to an engine load, in which map a valve overlapping period in which both an intake and an exhaust valve are open is set smaller in a high load range than in a medium load range, the valve overlapping period being the smallest for the reference timing;load detection means for detecting an engine load;pressure detection means for detecting an atmospheric pressure;displacement set means for setting the displacement by referring to the map according to the detected engine load; anddisplacement correction means for correcting the set displacement such that the lower the detected atmospheric pressure the more the set displacement is reduced.