HIGH SPEED AND HIGH ACCURACY POSITIONING OF PNEUMATIC CYLINDER WITH IMPROVED PULSE DRIVING METHOD

Abstract

The position control of a pneumatic cylinder at high speed and high accuracy is very difficult due to nonlinearities of its movement because of the air compressibility or the sliding frictions. In this study, above problems, the improved pulse driving control method is proposed to overcome. The position is controlled by the pulse driving high response on-off valves. In this control method, the phase plane trajectory is confined on the switching line using differential pressure. This position control is executed, the dynamic response and the position accuracy are experimentally examined.
As a result, obtained characteristics are so satisfactory that the efficiency of the proposed control method are ascertained.
And we have developed a positioning controller of a pneumatic cylinder with this control method. It has been used as a pneumatic servo robot in an actual product assembly lines.