Feature Model And Its Control

Most of the current intelligent control methods are not based on system's mathematical-model, but they can control complicate system effectively, because they have got system's characteristic variable such as error and error derivative. So the conceptions of "characteristic variable" and "characteristic model" are presented here, and with them as a clue, the paper focuses on collecting and summarizing the characteristic variable which can indicate system's state and performance, physical meaning of the variables are discussed also. The characteristic variable includes: stability-monitoring variable, characteristic variable based on time-domain performances, output waveform variable, parameter variable and circumstance variable. In addition, the paper discusses the control form based on characteristic model. Intelligent PID control and fuzzy control are analyzed in point of characteristic variable, and two analytical structure of control based on characteristic model are summarized. Finally the paper offers the prospect and future direction of this thesis.