Abstract
In this paper, the control characteristics of a positioning accuracy improvement of hydraulic cylinders using a microcomputer are reported in the case of using a directional control valve and proportional-type flow-control valve. According to the experimental results, the positioning time has a tendency to become short when the load was added against the forward direction in method (1) and (2) among the three methods. Next, it became clear that the best suited return length of control method (3) positioned by correcting the error is three times the first overshoot ΔL.And, the positioning movement of the hydraulic cylinder has been simulated in the positioning accuracy and expression for calculating a limit value of the positioning accuracy has been proposed.
