Magneti Marelli S.p.a.

I.m.a. Industria Macchine Automatiche S.p.a.

Dott. Ing. Mario Cozzani S.r.l.

Carlo Rossi

Alberto Tonielli

Gabriele Serra

Massimo Schiavone

Andrea Raggi

Pierantonio Ragazzini

Piero Azzoni

Giorgio Minelli

Davide Moro

Leonardo Potenza

Graziano Mazzuchetti

Andrea Tilli

Method for controlling the position of an electromechanical actuator for reciprocating compressor valves. The actuator includes a member () movable in a direction parallel to the direction for opening and closing the obturator of the valve (), between a position corresponding to the closed position and a position corresponding to the open position of the obturator (). The member () is provided with a mechanism () able to act on the obturator () and with a magnetizable portion () co-operating with two electromagnets () and being arranged in equilibrium between the latter via a suitable mechanism.

Method for controlling the position of an electromechanical actuator for reciprocating compressor valves

Method for exchanging information among digital units in a distributed system, with digital units being defined by at least a master node and slave nodes, involves transferring information references from a master node to slave nodes, the information references being sampled with sampling time corresponding to a cycle time period defined by a clock value of the master node. The method also involves estimating the number of the information references sampled arrived to the slave node from the master nodes during a periodic reference time interval, and using the number to recalculate the master clock value, so that the slave nodes are able to reconstruct master node information references during a following reference time interval.

Method for exchanging information among digital units in a distributed system

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.

Method and device for estimating magnetic flux in an electromagnetic actuator for controlling an engine valve

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.

Method and device for estimating the position of an actuator body in an electromagnetic actuator to control a valve of an engine

Method for determining the progress of internal pressure of a cylinder in an internal combustion engine, defining for each combustion cycle of the engine, the phases of defining the effective operating point of the engine according to the value assumed by a number of operational parameters of the engine; recording the progress of immediate angular speed of the engine shaft; calculating a transfer function involving the angular speed and the internal pressure of the cylinder at the effective defined operational point, on the basis of a plurality of reference transfer functions between internal pressure and angular speed relative to reference operating points of the engine; and deriving the progress of internal pressure at the cylinder of the transfer function at the actual operating point and of the progress of angular speed.

Method for determining the progress of internal pressure of a cylinder in an internal combustion engine

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Bologna, Italy

Carlo Rossi