In order to enhance smoothness of operation of pneumatic cylinder

a method based on gray prediction PID control is proposed.Gray prediction PID control structure is presented and gray prediction PID controller is designed

and on the basis of new error series generated by grey prediction theory

correction PID parameters expression is derived;filtering processing of output prediction is carried out

to eliminate deficiency of prediction on the high side.Pneumatic cylinder motion control system is set up and testing experiments is conducted.Results show that

compared to conventional PID control

speed overshoot of pneumatic cylinder running controlled by gray prediction PID fall from 22.1 % to 7.8 %

and speed range from ± 6.2 % to ± 2.1 %.Speed overshoot and oscillation problems in operation process of pneumatic cylinder controlled by gray prediction PID have markedly improved

so it can meet application requirements of most occasions.