Solenoid-operated valve control apparatus for internal combustion engine

Abstract

A control apparatus for a solenoid-operated valve that functions as an intake or exhaust valve of an internal combustion engine includes a lower spring biasing a valve body of the valve in a valve closing direction and upper and lower coils disposed above and below an armature for generating electromagnetic forces to move the valve body in the valve closing and valve opening directions. After a request for closing of the valve body is made, command currents are supplied to the upper and lower coils in suitable timing to increase the speed at which the valve body is seated against a valve seat. As the valve body rotates about its axis due to the action of the lower spring in the course of moving toward the valve seat, it is possible to crush and remove carbon between the valve body and the valve seat without causing local wear of the valve body.

Dependencies are inferred from the claim text.