Control device for internal combustion engine

Abstract

A control device for an internal combustion engine, which can set a VVT (variable valve timing) phase angle so that a reduction in the output of the engine can be suppressed even on a high ground, while ensuring sufficient output, is provided. The control device has a VVT mechanism which changes the opening or closing timing of one or both of an intake valve and an exhaust valve, and comprises: a processor device; a memory device for storing a control program for controlling the processor device; a first sensor for detecting atmospheric pressure; and a second sensor for detecting the amount of air flowing through an intake air flow path. The control program calculates a charging efficiency based on the amount of air detected by the second sensor, calculates a volumetric efficiency from the amount of air and the atmospheric pressure detected by the first sensor, calculates the charging efficiency valve opening timing of the intake valve based on the charging efficiency, calculates the volumetric efficiency valve opening timing of the intake valve based on the volumetric efficiency, and sets the valve opening timing(s) of one or both of the intake valve and the exhaust valve by the variable valve timing mechanism based on one of the charging efficiency valve opening timing and the volumetric efficiency valve opening timing.

Dependencies are inferred from the claim text.