CONTROL OF A SUSPENSION SYSTEM OF A VEHICLE PROVIDED WITH FOUR SEMI-ACTIVE SUSPENSIONS
First Claim
1. 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 (cHi) 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 (cPi) 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 (cHi) with the second damping coefficient (cPi);
for each semi-active suspension (5), selecting the first (cHi) or the second damping coefficient (cPi) 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 (cHi) (cPi).
1 Assignment
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Accused Products
Abstract
A method for controlling four semi-active suspensions of a vehicle comprising the steps of: determining, for each semi-active suspension, a first and a second signal representative of the acceleration and speed of the sprung mass; determining, for a pair of semi-active suspensions arranged on one side of the vehicle a third and a four signal representative of the acceleration and pitch speed; calculating for each semi-active suspension, a first damping coefficient as a function of the difference between the first and second signal squared; calculating for each semi-active suspension, a second damping coefficient as a function of the difference between the third and the four signal squared; for each semi-active suspension, comparing the first and the second damping coefficient for determining the higher coefficient; applying to each force generator device, an electronic control signal indicative of the respective high damping coefficient.
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Citations
15 Claims
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1. 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 (cHi) 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 (cPi) 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 (cHi) with the second damping coefficient (cPi); for each semi-active suspension (5), selecting the first (cHi) or the second damping coefficient (cPi) 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 (cHi) (cPi). - View Dependent Claims (2, 3, 4, 5, 6, 7, 15)
- 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);
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8. An electronic device for controlling a suspension system (4) of a vehicle comprising four semi-active suspensions 5 associated to four respective wheels 3 of the vehicle itself;
- each semi-active suspension being interposed between a sprung mass of the vehicle and a unsprung mass associated to a wheel of the vehicle and being controlled by a respective force generator device;
said device being configured for; 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 (cHi) 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 (cPi) 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 (cH1) with the second damping coefficient (cPi); for each semi-active suspension (5), selecting the first (cHi) or the second damping coefficient (cPi) 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 (cHi) (cPi). - View Dependent Claims (9, 10, 11, 12, 13, 14)
- each semi-active suspension being interposed between a sprung mass of the vehicle and a unsprung mass associated to a wheel of the vehicle and being controlled by a respective force generator device;
Specification