Patent ID: 6631895
Filing Date: 2003-10-14
Classification: F16F

Abstract:
A method for controlling the drive of an actuator of an active vibration isolation support system that includes an elastic body receiving a load from a vibrating body, a liquid chamber having a wall of which at least a part is formed by the elastic body, a movable member which changes a capacity of the liquid chamber, and an electromagnetic actuator which drives the movable member, the method comprising the steps of:setting a large number of consecutive micro time regions; carrying out duty control of voltage that is applied to the actuator in each of the micro time regions; and setting, via a fixed number of consecutive micro time regions in which changes of duty ratio form a defined pattern, a period of a current that drives the actuator, wherein said fixed number of said consecutive micro time regions are used to form said defined pattern, thereby to form a single operational cycle of the electromagnetic actuator.