Abstract: The present invention is directed to a suspension system for a vehicle. The system includes a wheel carrier rotatably supporting a wheel, a strut assembly connecting an upper end of the wheel carrier to a vehicle body, a lower control arm connecting a lower end of the wheel carrier to the vehicle body, and roll center control part for controlling a height of a roll center of the vehicle. The roll center control part includes a hydraulic source for generating hydraulic pressure, a hydraulic bushing disposed between the lower arm and the vehicle body, the hydraulic bushing having upper and lower chambers, first and second hydraulic control valves for controlling hydraulic pressure directed to or exhausted from the upper and lower chambers, respecively, whereby the hydraulic pressure is displaced upward and downward with respect to an axis of the vehicle body, and an electronic control unit for controlling the first and second hydraulic control valves in response to a driving state of the vehicle.

Abstract: An automotive active suspension system according to this invention uses valves of a simplified structure so that the availability of installing space is improved and energy consumption is reduced by decreasing the quantity of the returned fluid.