System for controlling and regulating an internal combustion engine's valve operation includes valve operating change mechanisms of a camshaft control type and a cam-phase change type

摘要

A four-cylinder DOHC internal combustion engine (E) has a crankshaft (3) connecting four pistons by con-rods (2). An internal combustion engine valve operating control system includes a first valve operating change mechanism of a camshaft control type (V1) and a second valve operating change mechanism of a cam-phase change type (V2). Hydraulic pressure controllers assist in adjusting oil pump pressure.