Abstract
The movement of pneumatic cylinders tends to be unstable and must be compensated in some manner. If the system is driven with proportional valves, the pole assignment method can be used by operating opening cross-sectional area in the proportional valve with a feeding back of the system state variables. The proposed servo system is driven by charging and discharging high speed switching valves and the valves switch the air up to 200 Hz. The compensation by operating opening time of valves is discussed and tested in this paper. As a result, the usefulness of this compensation is shown theoretically and experimentally.
Furthermore, the observer which estimates the higher order state variables is introduced into this servo system. The observer can estimate the system state variables such as velocity and pressure correctly, therefore allowing the sensors to be replaced.
