초록 ▼

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 i

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.

대표청구항 ▼

1. A control apparatus for a valve in an engine, comprising:an electromagnetic actuator comprising a spring biasing a kinetic system aligned with the valve and an electromagnet that attracts the kinetic system to open and close the valve; and a control unit configured to: calculate a damping coeffic

1. A control apparatus for a valve in an engine, comprising:an electromagnetic actuator comprising a spring biasing a kinetic system aligned with the valve and an electromagnet that attracts the kinetic system to open and close the valve; and a control unit configured to: calculate a damping coefficient of the kinetic system obtained during a free-fly operation accompanied with deenergization of the electromagnet; and calculate a current value of exciting current to be applied to the electromagnetic actuator in accordance with the damping coefficient.