Patent ID: 8473157

Claim:
A method for controlling a suspension system ( 4 ) of a vehicle ( 1 ) comprising four semi-active suspensions ( 5 ) associated to four respective wheels ( 3 ) of the vehicle ( 1 ) itself; each semi-active suspension ( 5 ) being interposed between a sprung mass (Msi) of the vehicle ( 1 ) and a unsprung mass (Nsi) associated to a wheel ( 3 ) of the vehicle ( 1 ) and being controlled by a respective force generator device ( 7 ); said method being characterized in that it comprises the steps of: determining, for each of the four semi-active suspensions ( 5 ), a first signal representative of the acceleration of the sprung mass (Msi) associated to the semi-active suspension ( 5 ) itself; determining, for each of the four semi-active suspensions ( 5 ), a second signal representative of the vertical speed of the sprung mass (Msi) associated to the semi-active suspension ( 5 ) itself; determining, for a pair of semi-active suspensions ( 5 ) arranged on a same side (Dx,Sx) of the vehicle ( 1 ) parallel to the longitudinal axis (L) of the vehicle ( 1 ) itself, a third signal representative of the pitch acceleration of the vehicle ( 1 ); determining, for a pair of semi-active suspensions ( 5 ) arranged on a same side (Dx,Sx) of the vehicle ( 1 ) parallel to the longitudinal axis (L) of the vehicle ( 1 ) itself, a fourth signal representative of the pitch speed of the vehicle ( 1 ); calculating for each of the four semi-active suspensions ( 5 ), a first damping coefficient (c H i ) associated to the vertical dynamics of said semi-active suspension ( 5 ), as a function of the difference between said first signal squared and said second signal squared; calculating for each of the four semi-active suspensions ( 5 ), a second damping coefficient (c P i ) associated to the pitch of the vehicle ( 1 ), as a function of the difference between the third signal squared and the fourth signal squared; for each semi-active suspension ( 5 ), comprising the first damping coefficient (c H i ) with the second damping coefficient (c P i ); for each semi-active suspension ( 5 ), selecting the first ( 4 ) or the second damping coefficient (c P i ) on the basis of the comparison; applying to each of the four force generators ( 7 ), an electric control signal (Sci) indicative of the respective selected damping coefficient (c H i )(c P i ).