Abstract: A method and unit for controlling a clutch powered by a hydraulic actuator having a work chamber connected to a solenoid valve; a target value of the pressure of the fluid inside the work chamber is generated, an actual value of the pressure of the fluid inside the work chamber is measured, and a control signal for controlling the solenoid valve is calculated using feedback control of the pressure of the fluid inside the work chamber; and the target value of the pressure of the fluid is generated on the basis of an actual value of the position of the hydraulic actuator, and of a target value of the position of the hydraulic actuator.

Abstract: A method and unit for controlling a clutch powered by a hydraulic actuator having a work chamber connected to a solenoid valve; a target value of the pressure of the fluid inside the work chamber is generated, an actual value of the pressure of the fluid inside the work chamber is measured, and a control signal for controlling the solenoid valve is calculated using feedback control of the pressure of the fluid inside the work chamber; and the target value of the pressure of the fluid is generated on the basis of an actual value of the position of the hydraulic actuator, and of a target value of the position of the hydraulic actuator.

Abstract: A method and device for estimating magnetic flux in an electromagnetic actuator for controlling an engine valve, whereby the actuating body, made at least partly of ferromagnetic material, is moved towards at least one electromagnet by the force of magnetic attraction generated by the electromagnet; and the value of the magnetic flux through a magnetic circuit defined by the electromagnet and by the actuating body is estimated by measuring the values assumed by various electric quantities of an electric circuit connected to the magnetic circuit, calculating the time derivative of the magnetic flux as a linear combination of the values of the electric quantities, and integrating in time the derivative of the magnetic flux.

Abstract: Method and device for estimating the position of an actuator body in an electromagnetic actuator to control a valve of an engine, according to which the actuator body, which is at least partly made of ferromagnetic material, is displaced towards at least one electromagnet, by the effect of the force of electromagnetic attraction generated by the electromagnet itself; the position of the actuator body relative to the electromagnet is determined on the basis of the value assumed by the reluctance of a magnetic circuit constituted by the electromagnet and by the actuator body.

Abstract: A method and device for estimating magnetic flux in an electromagnetic actuator for controlling an engine valve, whereby the actuating body, made at least partly of ferromagnetic material, is moved towards at least one electromagnet by the force of magnetic attraction generated by the electromagnet; and the value of the magnetic flux through a magnetic circuit defined by the electromagnet and by the actuating body is estimated by measuring the values assumed by various electric quantities of an electric circuit connected to the magnetic circuit, calculating the time derivative of the magnetic flux as a linear combination of the values of the electric quantities, and integrating in time the derivative of the magnetic flux.

Abstract: Method and device for estimating the position of an actuator body in an electromagnetic actuator to control a valve of an engine, according to which the actuator body, which is at least partly made of ferromagnetic material, is displaced towards at least one electromagnet, by the effect of the force of electromagnetic attraction generated by the electromagnet itself; the position of the actuator body relative to the electromagnet is determined on the basis of the value assumed by the reluctance of a magnetic circuit constituted by the electromagnet and by the actuator body.