Electrically activated valve actuator for an internal combustion engine

Abstract

The present invention concerns a method and a device for electrically controlling a valve actuator in a two-stroke or four-stroke combustion engine where the actuator comprises a solenoid (A), a plunger () and a spring (), wherein the engine has at least one cylinder () with at least one freely controllable engine valve disc () with corresponding valve stem () and a valve spring (), where a distance () is provided between the lower end of the plunger and the upper end of the valve stem and where air is supplied, or exhaust gases are evacuated from, a combustion chamber () past a lower part of the valve stem with the valve disc via at least one channel () in the cylinder, wherein the valve actuator is activatable to open the engine valve. The invention is characterized in that the opening of the engine valve is initiated after activation of the solenoid, wherein the following acceleration of the plunger brings its lower end to strike the upper end of the valve stem for initial opening of the valve.