| 摘要 |
In an electromagnetically powered engine valve control apparatus of an internal combustion engine having an electromagnetic actuator which drives the engine valve electromagnetically, and a valve-lift sensor which detecting a valve lift of the engine valve, a control unit operates the engine valve in a selected one of a normal operating mode enabling both powered opening and powered closing of the engine valve by energization of the electromagnetic actuator, and a free-fly operating mode enabling a kinetic system of the engine valve to be free to fly according to a damped vibration system by deenergization of the electromagnetic actuator. The control unit calculates a damping coefficient as a ratio of a valve lift detected during the free-fly operating mode to a valve lift detected during the normal operating mode, and also calculates a desired valve open period from a time when the engine valve starts to open to a time when the engine valve closes, based on engine speed. and engine load. A controlled current value of exciting current applied to the electromagnetic actuator is determined based on the damping coefficient and the desired valve open period.
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