| 摘要 |
PROBLEM TO BE SOLVED: To greatly improve response without impairing settability in control and prevent unfavorable control such as oscillation.SOLUTION: A model unit 6 has an input/output characteristic modeling an electric-pneumatic converter 3 and calculates an estimation value Pnof an input air pressure Pn inputted into a pilot relay 4 from the electric-pneumatic converter 3 by inputting a control signal MV from a control arithmetic unit 2. A deviation amount arithmetic unit 7 calculates a deviation amount d from an equilibrium state of the pilot relay 4 on the basis of an estimation value Pnof the input air pressure Pn calculated by the model unit 6 and an output air pressure Po outputted from the pilot relay 4. The control arithmetic unit 2 determines the control signal MV on the basis of an actual opening degree signal PV, an opening degree setting signal SP, and the deviation amount d from the equilibrium state of the pilot relay 4 and outputs the control signal MV to the electric-pneumatic converter 3. |
