Patent ID: 7665585

Claim:
A method for operating a vehicle suspension system extending between a frame and a wheel of a vehicle wherein the vehicle suspension system comprises a suspension assembly that includes a first spring seat for movement with the wheel and a second spring seat for movement relative to the frame of the vehicle and a spring having a spring stiffness and extending between the first spring seat and the second spring seat for elastically deflecting in response to movement of the wheel relative to the frame, and said suspension assembly further includes an actuator that engages the frame and is configured to displace the second spring seat relative to the frame of the vehicle, wherein the method comprises the steps of: measuring a frequency of a suspension deflection of said frame in relation to the spring utilizing a frequency sensor; analyzing if the frequency is below a predetermined frequency using a controller; controlling the actuator by the controller when the frequency is below a predetermined frequency; moving the second spring seat by the actuator relative to the frame of the vehicle in response to the frequency being below a predetermined frequency to control the stiffness of the spring to minimize movement of the frame of the vehicle.