Abstract
PID control is generally used to control mechanical systems. PID control, however, has a limit of accuracy because of the influence of gravity, friction, and interaction of joints. This is caused by modeling error. Digital acceleration control has robustness for the modeling error. Therefore, digital acceleration control is more effective than PID control. But it requires position, velocity, and acceleration of a controlled object to construct a controller. Information of velocity and acceleration cannot be always obtained in mechanical systems.Furthermore, it is desirable that the number of sensors is reduced for the purpose of cost and maintenance. To solve these problems we use ESDS, which is a nonlinear filter based on sliding mode technique. ESDS enables digital acceleration control without increasing the number of sensors. In this paper, we show the results of the proposed control method by using a perpendicular 1-link and 2-link manipulator.
