SUSPENSION SYSTEM FOR VEHICLE

摘要

A suspension system for a vehicle, including: an electromagnetic actuator including: (A) a sprung-side unit connected to a sprung portion; (B) an unsprung-side unitcommat;which is connected to an unsprung portion and which moves relative to the sprung-side unit in association with a relative movement of the sprung portion and the unsprung portion toward and away from each other; (C) a screw mechanism; (D) an electromagnetic motor, the actuator being configured to generate an actuator force; a connecting mechanism which includes a support spring for permitting one of the sprung-side unit and the unsprung-side unit to be supported by one of the sprung portion and the unsprung portion to which the one of the sprung-side unit and the unsprung-side unit is connected; and a controller configured to control the actuator force of the actuator, wherein the controller includes: a sprung-vibration-damping control portion configured to execute a sprung-vibration damping control for generating, as one component of the actuator force, a force having a magnitude in accordance with a moving speed of the sprung portion, so as to damp a vibration of the sprung portion; and a relative-vibration-damping control portion configured to execute a relative-vibration damping control for generating, as one component of the actuator force, a force having a magnitude in accordance with one of: (a) a relative moving speed of the sprung-side unit and the unsprung-side unit; and (b) a relative moving speed of the one of the sptung-side unit and the unsprung-side unit and the one of the sprung portion and the unsprung portion, so as to damp a vibration of the one of the sprung-side unit and the unsprung-side unit that is caused by the support spring.