(19)
(11) EP 2 065 624 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
30.09.2009 Bulletin 2009/40

(43) Date of publication:
03.06.2009 Bulletin 2009/23

(21) Application number: 07425752.8

(22) Date of filing: 28.11.2007
(51) International Patent Classification (IPC): 
F16H 61/30(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(71) Applicant: MAGNETI MARELLI POWERTRAIN S.p.A.
20011 Corbetta (MI) (IT)

(72) Inventors:
  • Fusari, Alessandro
    26100 Cremona (IT)
  • Marchetto, Paolo
    10073 Cirie' (IT)
  • Ragazzi, Roberto
    10148 Torino (IT)

(74) Representative: Jorio, Paolo et al
STUDIO TORTA Via Viotti 9
10121 Torino
10121 Torino (IT)

 
Remarks:
Amended claims in accordance with Rule 137(2) EPC.
 


(54) A method of driving an hydraulic actuator by means of a pressure-controlled proportioning solenoid valve


(57) A method of driving a hydraulic actuator (13) provided with a pressure-controlled proportioning solenoid valve (21); the method includes the steps of: determining a first open-loop contribution (Ip) according to a pressurized oil flow rate (QFF) which crosses the proportioning solenoid valve (21) and according to the desired load pressure (Pload) inside the actuation chamber (20); determining a second open-loop contribution (IQFF) according to the desired position (XSpoolRef) of the spool (29) of the proportioning solenoid valve (21); determining a third closed-loop contribution (IQCL) according to the difference (εX) between a desired value (XREF) of the position of the mobile piston (22) and a real value (X) of the position of the mobile piston (22); and calculating a desired electric driving current value (ITOT) of the proportioning solenoid valve (21) by means of an algebraic sum of the three contributions (IP, IQFF, IQCL).