Feed-forward-fuzzy PID (Proportional-Integral-Differential) control method suitable for intermittent blow-down transonic wind tunnel

The invention discloses a feed-forward-fuzzy PID (Proportional-Integral-Differential) control method suitable for an intermittent blow-down transonic wind tunnel. The method comprises a fuzzy reasoning part, a PID control part and a feed-forward control part, and is characterized in that a controller transmits a controlled quantity deviation and a deviation change rate to the fuzzy reasoning partthrough closed loop feedback; parameters of the PID control part are obtained in real time through fuzzy reasoning; and when an angle of attack changes, the feed-forward control part sets a feed-forward controlled quantity according to angle of attack feedback in order to restrain the turbulence caused by change of the angle of attack. The existing expert knowledge and running data are utilized, the expert knowledge is fused into the design of the controller, and the parameters of a PID controller are adjusted in real time through a fuzzy rule in order to improve the control accuracy for the total pressure and the Mac