ADVANCE CONTROL TYPE AUTOMATIC CONTROLLER

摘要

PURPOSE:To attain the stable automatic/manual switching when the number of operating units are changed by using the mode switching differential for detection and prescribing an arithmetic order for mode switching of a proportion integrator and calculation of a single controlled valuable common to each operating terminal. CONSTITUTION:When the number of automatic operating units of stokers are changed, an advance control type operator 28 calculates an advance control signal 30. A differentiator 33 detects the sloping of the suddenly changed signal 30. A signal generator 34 detects the change of the number of automatic operating units of stokers from the detected sloping of the signal 30 and produces a signal to switch a PI operator 18 to a tracking mode. A subtractor 35 subtractes the signal 30 from a stoker command 19 to obtain a tracking signal of the operator 18. While an adder 29 adds the output of the operator 18 and the signal 30 to produce the command 19. This command 19 has the same level as that obtained before the number of operating units of the stokers are changed. Then the operator 18 is switched to an automatic mode and the stokers are controlled through the control of proportion integration and the advance control.