Abstract
Natural frequency and low damping are the basic characteristics of the hydraulic cylinder drives. The main purpose when designing a demanding hydraulic cylinder servo drive is to increase the damping. The position control systems are the most common application of the hydraulic servo cylinder drives. Many different control algorithms have been applied to hydraulic position control systems. In this case the motion control is considered to be an application where the load (a force and inertia load) is transferred from point to point with different programmable strokes and velocities. A combination of different controllers helps the hydraulic servo cylinder drive achieve a good motion control. In this paper a combination of two controllers is used. The controllers are a position controller and a velocity controller. Different phases of the movement require different controllers. In this paper two methods to switch from one controller to another are shown and discussed.
