Automotive suspension system for anti-rolling control

Claim 1

A suspension control system for a vehicle comprising: shock absorbers disposed between a vehicle body and suspension members rotatably supporting wheels respectively, each shock absorber being variable of damping coefficient within a range from softer to harder damping characteristics; vehicle attitude change determining means for determining a preselected vehicle attitude change parameter to provide a signal indicative thereof; damping coefficient adjusting means for modifying the damping coefficients of said shock absorbers respectively; steered angle determining means for determining a steered angle of the vehicle to provide a signal indicative thereof; steered angular velocity determining means for determining a steered angular velocity of the vehicle to provide a signal indicative thereof; and control means responsive to the signals from said vehicle attitude change determining means, said steered angle determining means, and said steered angular velocity determining means to provide control signals to said damping coefficient adjusting means when the steered angular velocity and the steered angle are greater than preselected first and second threshold values respectively so that the damping coefficients of said shock absorbers in a preselected direction of stroke are modified to a preselected higher damping coefficient which exhibits the harder damping characteristics based on the vehicle attitude change parameter for suppressing rolling motion of the vehicle body, wherein the steered angle is determined based on a steered angle difference from a neutral steered angle of the vehicle, when the steered angular velocity determined by said steered angular velocity determining means is kept less than said first threshold value for a preselected period of time, a value of said neutral steered angle being updated to a value of the steered angle determined by said steered angle determining means.