초록 ▼

The system and method for controlling an electomagnetically operated valve driving mechanism comprises an actuator, an actuator drive circuit, a lift sensor, an actuator control apparatus, and a micro-computer. The actuator includes a valve opening solenoid and a valve closing solenoid. The actuator

The system and method for controlling an electomagnetically operated valve driving mechanism comprises an actuator, an actuator drive circuit, a lift sensor, an actuator control apparatus, and a micro-computer. The actuator includes a valve opening solenoid and a valve closing solenoid. The actuator control apparatus generates signals for energizing and deenrgizing the valve opening solenoid and the valve closing solenoid based on control data supplied from the lift sensor and the micro-computer. The feature of this system is to control the elecromagnetically operated valve driving mechanism only by the actuator control apparatus but not by the micro-computer in a precise and sophisticated manner, thereby a burden on the micro-computer can be lightened.

대표청구항 ▼

[ What is claimed is:] [1.] An electromagnetically operated valve control system for an engine having a combustion chamber, a valve body reciprocating between a fully closed position and a fully open position so as to open and close said combustion chamber, an actuator connected with said valve body

[ What is claimed is:] [1.] An electromagnetically operated valve control system for an engine having a combustion chamber, a valve body reciprocating between a fully closed position and a fully open position so as to open and close said combustion chamber, an actuator connected with said valve body for driving said valve body by energizing and deenergizing a valve closing solenoid and a valve opening solenoid, and an actuator drive circuit for energizing and deenergizing said valve closing solenoid and said valve opening solenoid of said actuator, comprising:control data generating means for generating a control data based on operating conditions of said engine;valve position detecting means for detecting reference positions of said valve body;valve closing acceleration means for energizing said valve closing solenoid when said valve body passes a first reference position established apart from said fully open position and for deenergizing said valve closing solenoid when said valve body passes a second reference position closer to said fully closed position than said first reference position;valve seating velocity adjusting means for energizing said valve closing solenoid when said valve body passes a third reference position closer to said fully closed position than said second reference position and for deenergizing said valve closing solenoid when said valve body passes a fourth reference position closer to said fully closed position than said third reference position so as to adjust a seating velocity of said valve body; andvalve closing hold means for repeatedly energizing and deenergizing said valve closing solenoid when said valve body passes said fourth reference position and for deenergizing said valve closing solenoid when a first specified period has elapsed since said valve body passes said fourth reference position.