| 摘要 |
PROBLEM TO BE SOLVED: To provide a three position control method and a three position controller capable of suppressing running costs and improving control precision. SOLUTION: At the time of holding controlled variables around a set value Tk by a controlled variable increasing means 60 for increasing the controlled variables and a controlled variable decreasing means 70 for decreasing the controlled variables, an upper control target value Tc for controlling the controlled variable decreasing means 70 is set at a prescribed position above the set value Tk, and a lower control target value Th for controlling the controlled variable increasing means 60 is set at a prescribed position below the set value Tk, and correction processing for bringing the control target value used for calculating deviation Td between the controlled variables and the control target value closer to the set value Tk is performed. |
