Internal combustion engine, with a system for variable actuation of the intake valves provided with a three-way electric valve having three levels of supplying current, and method for controlling this engine

摘要

An internal-combustion engine with two intake valves (7A, 7B) for each cylinder is provided with a system for variable actuation of the intake valves, comprising a single electrically actuated or electromagnetically actuated control valve for each cylinder that controls communication of the pressurized-fluid chamber (C) of the system with an exhaust channel (23). The control valve (24) is a three-way, three-position valve, comprising an inlet (i) permanently communicating with the pressurized-fluid chamber and with the hydraulic actuator of an intake valve (7B), and two outlets (ul, u2) communicating, respectively, with the actuator of the other intake valve (7A) and with said exhaust channel, and has an actuator that supplies a first value of current (11) for bringing the control valve into its aforesaid second position (P2); a second value of current (I2peak), for bringing the control valve into its aforesaid third position (P3); and a third value of current (I2hold).