초록 ▼

A control apparatus for a valve of an internal combustion engine electrically opens and closes an intake or exhaust valve of the internal combustion engine with reduced power consumption while securing stable operating characteristics. The electromagnetically driven valve is opened and closed by com

A control apparatus for a valve of an internal combustion engine electrically opens and closes an intake or exhaust valve of the internal combustion engine with reduced power consumption while securing stable operating characteristics. The electromagnetically driven valve is opened and closed by combining an electromagnetic force produced by upper and lower electromagnets and an elastic force produced by upper and lower springs. At a timing at which one of the upper and lower electromagnets is to attract the valve, a predetermined attracting current is supplied to the respective one of the upper and lower electromagnets, and it is detected whether there is a step out of the valve. If a step out is detected, the attracting current applied to the respective one of the upper and lower electromagnets in the next cycle is increased. If the step out is not detected, the attracting current used in the next cycle is decreased.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for opening and closing a valve of an internal combustion engine, wherein the apparatus combines an electromagnetic force produced by an electromagnet and an elastic force produced by an elastic member to drive the valve, the apparatus comprising:an attractin

[ What is claimed is:] [1.] An apparatus for opening and closing a valve of an internal combustion engine, wherein the apparatus combines an electromagnetic force produced by an electromagnet and an elastic force produced by an elastic member to drive the valve, the apparatus comprising:an attracting current supplier that supplies an attracting current to the electromagnet to attract the valve to the electromagnet;a step-out detector that detects a step out of the valve from a predetermined opening and closing operation;attracting current increase means for, when a step out is detected, increasing the attracting current to be used in a subsequent valve attracting cycle; andattracting current decrease means for, when a step out is not detected, decreasing the attracting current to be used in the subsequent cycle.