| The objective of this dissertation is a kind of press-high speed numeric control oil-press. With a theoretical analysis and study about proportional control system, this paper sets up the mathematical model of proportional valve controlled non-symmetry hydraulic cylinder via the hydraulic system model building. Then analyzes and modifies the model based on the matter of this study, and simulates the model with Matlab software to confirm PID parameters, thus designs the PID controller. This makes the design of control system has further reliability and flexibility. At last, realize the control method using PIC single-chip microcomputer, and validate the success of the PID control method through the examination.
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