PRESSURE PATTERN IMPROVEMENT OF PROPORTIONAL VALVE APPLICATION ON HOT PRESS MACHINE USING PID

Abstract

The purpose of this study is to develop a control scheme for the hydraulic proportional
system using PID function on Mitsubishi PLC Q series, which can rapidly control the pressure
in a hydraulic cylinder with very short stroke. The mathematical model of the control system is
established according to the principle of the electro-hydraulic system. Considering the mentioned
characteristics, simulation of the system modelling will be established to know the system
response. In order to improve the control precision of the hydraulic hot-press system, the
Mitsubishi PID controller are designed by selecting appropriate tuning parameters. Their control
performances are analysed in time domain respectively. The variation of PID controller
configuration will be conduct to know the better model for this system controller. The validity
of the proposed control scheme is confirmed through the experiments to verify the rationality of
the theoretical model. The results show that the Mitsubishi PID and the ideal PID give the same
result for the tuning parameter resulted from simulation. And also the experiment give the better
stability in the 3 different pressure set value that conduct by author.