Abstract: An electrohydraulic unit for actuating the valves of an endothermic engine is provided with a hydraulic actuator for lifting a respective valve by means of a pressurized liquid and a spring antagonistic to the hydraulic actuator in order to close the valve and to discharge the liquid from the hydraulic actuator in the final closure phase of the valve through a discharge branch provided with a calibrated orifice to slow down the expulsion of the liquid and maintain a substantially constant closing velocity of the valve during discharge of the liquid from the hydraulic actuator.

Abstract: An electrohydraulic unit for actuating the valves of an endothermic engine is provided with a hydraulic actuator for lifting a respective valve by means of a pressurized liquid and a spring antagonistic to the hydraulic actuator in order to close the valve and to discharge the liquid from the hydraulic actuator in the final closure phase of the valve through a discharge branch provided with a calibrated orifice to slow down the expulsion of the liquid and maintain a substantially constant closing velocity of the valve during discharge of the liquid from the hydraulic actuator.

Abstract: A control method for an internal combustion engine provides for the acquisition of a signal correlated with the vibrations transmitted by at least one component of the internal combustion engine moving between two end positions; the vibrations are transmitted by the impact of the moving component against an abutment disposed at the location of at least one of the end positions during the operation of the internal combustion engine.

Abstract: A method of controlling the speed of the valves in an electro-hydraulic actuation unit for the valves of an internal combustion engine in which the pressure of the fluid in the hydraulic actuator of the valve is controlled during the final phase of closure of a valve.

Abstract: A method for controlling an electrohydraulic unit for actuating the valves of an endothermic engine, in which the electrohydraulic unit is provided with a hydraulic actuator for opening the respective valve with a pressurized liquid, and a spring that is antagonistic to the hydraulic actuator in order to close the valve, provides for the control of the connection time between the hydraulic actuator and a first branch containing the. pressurized liquid as a function of a predetermined time characteristic of the electrohydraulic unit.

Abstract: Method for estimating the position and the speed of an actuator body in an electromagnetic actuator for controlling a valve of an engine, according to which, starting from a known value for the position and a first moment, a value is calculated at the first moment of the magnetic flux passing through a magnetic circuit constituted by an electromagnet and by the actuator body, the value for the speed at the first moment is estimated as a function of the magnetic flux and the position at the first moment, and the value is calculated at a second moment following the first moment and separated from said first moment by an interval of time determined by adding to the value of the position at the first moment the product of the speed at the first moment for the interval of time.