The invention provides a composite control method for piezoelectric
ceramic positioning. In the method, different control combination ways are adopted in an entire process; a threshold value
delta is set; composite control of
feedback control and PID (
Proportion Integration Differentiation) control, or composite control of
feedback control and PD (Proportion Differentiation) control is used selectively according to the magnitude relation between a displacement deviation e (kT) and the threshold value
delta. According to the method, a
mathematical model is required to be established, the
lag and nonlinearity of a piezoelectric
ceramic driver are described by adopting the conventional Preisach model, and the parameter of PID or PD is self-tuned on line by using fuzzy control, so that
optimal control of a
system can be realized, and the
system has the advantages of flexibility, high adaptability and the like of fuzzy control. In the method, a
selective control method combination is used for the first time, so that the positioning accuracy of piezoelectric
ceramic is increased effectively, the stability and
interference resistance are enhanced, the response
rise time is shortened, and
lag and creepage are eliminated effectively simultaneously.