Method for regulation of currents during phases of stoppage in electromagnetic actuators, for actuation of intake and exhaust valves in internal-combustion engines

摘要

Method for regulation of currents during phases of stoppage in electromagnetic actuators, for actuation of intake and exhaust valves in internal-combustion engines, in which an actuator is connected to a respective intake or exhaust valve which has a position, and includes a mobile unit, which is actuated magnetically in order to control the movement of the valve, a sensor which supplies a position signal which is representative of a present position of the mobile unit, and a first and a second electromagnet, which are disposed on opposite sides of the mobile unit, and receive respectively a first and a second current; the mobile unit being disposed in a position of stoppage during phases of stoppage. The method includes the phases of: setting at least one current out of the first and the second currents to an initial maintenance value, when the valve is in a position of stoppage; checking that the valve remains in a position of stoppage for a pre-determined interval of time; and decrementing the current, if the valve has remained in a position of stoppage for the pre-determined interval of time.