Patent ID: 8191456
Filing Date: 2012-06-05
Classification: F16H

Abstract:
1. A method of driving a hydraulic actuator comprising: at least one actuation chamber; a mobile piston which slides inside an actuation chamber; and a pressure-controlled proportioning solenoid valve for connecting the actuation chamber to a hydraulic accumulator containing a pressurized control oil and to a tank containing a control oil at atmospheric pressure; the method comprising the steps of: determining a force which must be developed by the hydraulic actuator; determining a desired load pressure (P determining a desired electric current driving value (I supplying the proportioning solenoid valve with an electric driving current having the desired value (I estimating a pressurized oil flow rate (Q determining a first open-loop contribution (I estimating a pressure drop (DltP estimating a desired position (X determining a second open-loop contribution (I determining a third closed-loop contribution (I calculating the desired electric driving current value (I