Patents by Inventor Roberto Ragazzi

Roberto Ragazzi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of driving an hydraulic actuator by means of a pressure controlled proportioning solenoid valve
    Patent number: 8191456
    Abstract: A method of driving a hydraulic actuator provided with a pressure-controlled proportioning solenoid valve; the method includes the steps of: determining a first open-loop contribution according to a pressurized oil flow rate which crosses the proportioning solenoid valve and according to the desired load pressure inside the actuation chamber; determining a second open-loop contribution according to the desired position of the spool of the proportioning solenoid valve; determining a third closed-loop contribution according to the difference between a desired value of the position of the mobile piston and a real value of the position of the mobile piston; and calculating a desired electric driving current value of the proportioning solenoid valve by means of an algebraic sum of the three contributions.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: June 5, 2012
    Assignee: Magneti Marelli Powertrain S.p.A.
    Inventors: Alessandro Fusari, Paolo Machetto, Roberto Ragazzi
  • Method of driving an hydraulic Actuator by means of a pressure controlled proportioning solenoid valve
    Publication number: 20090173220
    Abstract: A method of driving a hydraulic actuator provided with a pressure-controlled proportioning solenoid valve; the method includes the steps of: determining a first open-loop contribution according to a pressurized oil flow rate which crosses the proportioning solenoid valve and according to the desired load pressure inside the actuation chamber; determining a second open-loop contribution according to the desired position of the spool of the proportioning solenoid valve; determining a third closed-loop contribution according to the difference between a desired value of the position of the mobile piston and a real value of the position of the mobile piston; and calculating a desired electric driving current value of the proportioning solenoid valve by means of an algebraic sum of the three contributions.
    Type: Application
    Filed: November 26, 2008
    Publication date: July 9, 2009
    Inventors: Alessandro Fusari, Paolo Marchetto, Roberto Ragazzi