Abstract：The trajectories of the piezoelectric dispensing machine are usually difficult to precisely control due to the factors of hysteresis,hydraulic pressure,structural nonlinearity. In order to improve the speed and accuracy of dispensing system,a method of trajectory tracking is proposed based on the fuzzy PID control for piezoelectric dispensing machine. By analyzing and modeling the dispensing machine,the fuzzy PID controller is used to compensate the errors. It is shown that this kind of controller is suitable for the trajectory tracking of piezoelectric dispensing machine and has excellent control effect. This kind of method can be applied to other similar NC dispensing system,and have the versatility.

Keyword：dispensing system;trajectory tracking;fuzzy PID control;piezoelectric dispensing machine;